Brake device and baby carriage

Abstract

The utility model belongs to the technical field of baby products, and particularly discloses a brake device and a baby carriage, the brake device comprises a driving piece, a transmission assembly and a brake assembly, the transmission assembly comprises a brake pipe, a rotating seat and a limiting pin, the rotating seat is rotatably sleeved outside the brake pipe, a first guide groove is arranged on the brake pipe, and the limiting pin is arranged in the first guide groove. A second guide groove is formed in the rotating seat, the limiting pin penetrates through the first guide groove and the second guide groove, and the rotating seat is in transmission connection with the driving part. The brake assembly comprises a brake pin, the brake pin is installed in the brake pipe in a telescopic mode, and the brake pin is in transmission connection with the limiting pin. Through cooperation of the brake pipe, the rotating seat and the limiting pin, power transmission from the driving piece to the brake pin is achieved, the brake pin can be matched with the locking part on the wheel so as to achieve brake stopping or brake releasing of the wheel, the transmission precision is high, operation is flexible, the failure rate is low, and safety and reliability are high. The utility model further provides the baby carriage which comprises the brake device.

Description

Technical Field

[0001] This utility model relates to the field of baby product technology, and in particular to a braking device and a stroller. Background Technology

[0002] A stroller is a tool vehicle designed to facilitate infants' outdoor activities. The safety of stroller use is of paramount importance, and the quality of the stroller's braking system is a key factor affecting stroller safety.

[0003] Most existing stroller braking devices use steel cables for power transmission to drive the stroller to brake and release. However, braking devices using steel cables have a high failure rate. The steel cables are prone to breakage during use, resulting in poor safety and reliability. In addition, the transmission accuracy is also low, the operation is inflexible, and frequent maintenance or replacement is required, which increases the cost of use. Utility Model Content

[0004] The purpose of this utility model is to provide a braking device and a stroller, which have high transmission precision in the transmission components that realize power transmission, flexible braking operation, low failure rate, and high safety and reliability.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] On one hand, this utility model provides a braking device, mounted on a vehicle frame, for stopping or releasing the wheels, wherein the wheels are provided with a locking part, and the braking device includes:

[0007] Drive components;

[0008] A transmission assembly, comprising a brake pipe, a rotating seat, and a limiting pin, wherein the rotating seat is rotatably fitted over the brake pipe, the brake pipe has a first guide groove, the rotating seat has a second guide groove, and the limiting pin passes through the first guide groove and the second guide groove; the rotating seat is drively connected to the driving component; and

[0009] A brake assembly, comprising a brake pin and a resilient reset member, wherein the brake pin and the resilient reset member are installed inside the brake tube, the brake pin is retractable relative to the brake tube, and the brake pin is throttle-connected to the limiting pin;

[0010] When the braking device is in the first working position, the limiting pin is located at the first end of the first guide groove and the first end of the second guide groove. Under the action of the limiting pin, the brake pin retracts into the brake tube, the elastic reset member is compressed, the brake pin disengages from the locking part, and the wheel is in the released braking state.

[0011] When the braking device is in the second working position, the limiting pin is located at the second end of the first guide groove and the second end of the second guide groove. Under the elastic force of the elastic reset member, the brake pin extends out of the brake tube and cooperates with the locking part, and the wheel is in a stopped state.

[0012] Optionally, the wheel includes two parts, and the brake assembly includes two brake pins and a resilient reset member. Each of the two brake pins has a mounting portion at one end close to the other. The two ends of the resilient reset member are respectively connected to the mounting portion on one of the brake pins. The resilient reset member allows the two brake pins to extend out of the brake tube simultaneously, and each brake pin cooperates with the locking portion on one of the wheels.

[0013] Optionally, the brake pin includes a fixed seat, a connector, and a locking pin. The fixed seat has an opening on one side. One end of the locking pin is installed into the fixed seat through the opening. The connector fixes the fixed seat and the locking pin together. The other end of the locking pin cooperates with the locking part. The mounting part is disposed on the outer wall of the fixed seat on the side away from the opening.

[0014] Optionally, the mounting part is columnar, and the cross-section of the mounting part is cross-shaped or star-shaped, and the elastic reset member is sleeved on the mounting part.

[0015] Optionally, there are two of each of the limiting pin and the rotating seat. The limiting pin, the rotating seat and the brake pin correspond one-to-one. The brake tube is provided with four first guide grooves. Every two first guide grooves form a group. Each rotating seat is provided with two second guide grooves. Two second guide grooves form a group. Each limiting pin passes through a group of first guide grooves, a group of second guide grooves and a brake pin.

[0016] Optionally, the first guide groove is a strip groove, and the length direction of the first guide groove is the same as the axial direction of the brake pipe;

[0017] The second guide groove is a triangular groove, and the second guide groove includes a guide slope. The guide slope is set at an angle to the axial direction of the rotating seat, and the rotating seat is coaxial with the brake pipe.

[0018] Optionally, a protrusion is provided between the first end of the second guide groove and the guide slope. When the rotating seat rotates under the drive of the driving member, the limiting pin passes over the protrusion from the first end of the second guide groove and moves along the guide slope to the second end of the second guide groove.

[0019] Optionally, the driving component includes a foot pedal and a first mounting cylinder, the foot pedal being fixedly connected to the first mounting cylinder, and the first mounting cylinder being sleeved outside the rotating seat and engaging with the rotating seat.

[0020] Optionally, the wheel includes a wheel seat and a wheel. The wheel seat includes a second mounting cylinder. One end of the second mounting cylinder is sleeved on the outside of the brake pipe and detachably connected to the brake pipe. The other end of the second mounting cylinder is detachably connected to the wheel.

[0021] On the other hand, this utility model provides a stroller, including a frame, wheels and a braking device as described in any of the above embodiments, wherein the wheels are mounted on the frame and the braking device is connected to the wheels and used to stop or release the wheels.

[0022] The beneficial effects of this utility model are as follows:

[0023] This utility model provides a braking device, including a driving component, a transmission assembly, and a braking assembly. The transmission assembly includes a brake tube, a rotating seat, and a limiting pin. The rotating seat is rotatably fitted over the brake tube. The brake tube has a first guide groove, and the rotating seat has a second guide groove. The limiting pin passes through the first and second guide grooves, and the rotating seat is drive-connected to the driving component. The braking assembly includes a brake pin, which is retractably installed inside the brake tube and drive-connected to the limiting pin. Through the cooperation of the brake tube, rotating seat, and limiting pin, power transmission from the driving component to the brake pin is achieved. The brake pin can cooperate with a locking part on the wheel to stop or release the brake. The braking device has high transmission precision, flexible operation, low failure rate, and high safety and reliability.

[0024] This utility model also provides a stroller, including a frame, wheels, and the aforementioned braking device. The wheels are mounted on the frame, and the braking device is used to stop or release the wheels. By employing the aforementioned braking device, precise power transmission can be achieved, braking operation is flexible, the failure rate is low, and the stroller has high safety and reliability. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of the frame, wheels, and braking device provided in the embodiments of this utility model;

[0026] Figure 2 This is an exploded view of the frame, wheels, and braking device provided in the embodiments of this utility model;

[0027] Figure 3 The explosion of the wheel and brake device provided in this embodiment of the utility model. Figure 1 ;

[0028] Figure 4 yes Figure 3A partial enlarged view of point A in the middle;

[0029] Figure 5 The explosion of the wheel and brake device provided in this embodiment of the utility model. Figure 2 ;

[0030] Figure 6 yes Figure 5 A magnified view of a section at point B in the middle;

[0031] Figure 7 This is an exploded view of the brake assembly provided in the embodiment of this utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the rotating seat provided in the embodiment of this utility model;

[0033] Figure 9 This is a schematic diagram of the structure of the driving component provided in the embodiment of this utility model.

[0034] Figure 10 This is an exploded view of the wheel and brake pipe provided in the embodiment of this utility model;

[0035] In the picture:

[0036] 100. Frame; 110. Connector; 200. Wheel; 210. Wheel seat; 211. Second mounting sleeve; 2111. Third mounting hole; 212. Fixing lug; 220. Wheel; 221. Locking part; 300. Drive component; 310. Foot pedal; 320. First mounting sleeve; 321. First rib; 322. Second rib; 400. Brake pipe; 410. First guide groove; 420. Four mounting holes; 500, rotating seat; 510, second guide groove; 511, guide slope; 512, protrusion; 520, limiting groove; 600, limiting pin; 700, brake pin; 710, fixed seat; 711, open opening; 712, first mounting hole; 713, second mounting hole; 720, connector; 730, locking pin; 731, fixing hole; 740, mounting part; 800, elastic reset part. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] like Figures 1-6 As shown, this embodiment provides a braking device, which is mounted on a frame 100. The frame 100 is connected to a wheel 200, and the wheel 200 is provided with a locking part 221. The braking device includes a driving member 300, a transmission assembly, and a braking assembly. The two ends of the transmission assembly are respectively connected to the driving member 300 and the braking assembly. Under the action of the driving member 300, the braking assembly can cooperate with the locking part 221 on the wheel 200 to achieve braking or releasing of the wheel 200.

[0042] The transmission assembly includes a brake tube 400, a rotating seat 500, and a limiting pin 600. The rotating seat 500 is rotatably sleeved on the brake tube 400. The brake tube 400 has a first guide groove 410, and the rotating seat 500 has a second guide groove 510. The limiting pin 600 passes through the first guide groove 410 and the second guide groove 510. The rotating seat 500 is drive-connected to the driving member 300. The brake assembly includes a brake pin 700 and an elastic reset member 800. The brake pin 700 and the elastic reset member 800 are installed inside the brake tube 400. The brake pin 700 is retractable relative to the brake tube 400 and is drive-connected to the limiting pin 600.

[0043] In use, the braking device has two working positions: a first working position and a second working position. When the braking device is in the first working position, the limiting pin 600 is located at the first end of the first guide groove 410 and the first end of the second guide groove 510. Under the action of the limiting pin 600, the brake pin 700 retracts into the brake tube 400, the elastic reset member 800 is compressed, the brake pin 700 disengages from the locking part 221, the wheel 200 is in the released state, and the stroller can move freely. When the braking device is in the second working position, the limiting pin 600 is located at the second end of the first guide groove 410 and the second end of the second guide groove 510. Under the elastic force of the elastic reset member 800, the brake pin 700 extends out of the brake tube 400 and engages with the locking part 221. The wheel 200 is in the stopped state, the stroller is locked, and cannot move.

[0044] In this embodiment, the transmission assembly, through the cooperation of the brake pipe 400, the rotating seat 500 and the limiting pin 600, realizes the power transmission from the drive component 300 to the brake pin 700, replacing the previous method of using steel rope for transmission in strollers. This transmission assembly has high transmission accuracy, flexible braking operation, low failure rate, and high safety and reliability.

[0045] Further, see Figure 2 , Figure 4 and Figure 6In this embodiment, the wheel 200 includes two wheels, and the brake assembly includes two brake pins 700 and an elastic reset member 800. The two brake pins 700 are provided with mounting portions 740 at their close ends. The two ends of the elastic reset member 800 are respectively connected to the mounting portions 740 on one of the brake pins 700. The limiting pin 600 passes through the first mounting hole 712 of the brake pin 700. The first mounting hole 712 is a through hole. When the drive unit 300 drives the rotating seat 500 to rotate on the brake pipe 400 (in this embodiment, the rotating seat 500 rotates clockwise on the brake pipe 400 as an example), the limiting pin 600 moves from the first end of the second guide groove 510 to the second end of the second guide groove 510. At the same time, the limiting pin 600 moves from the first end of the first guide groove 410 to the second end of the first guide groove 410. Then, under the elastic force of the elastic reset member 800, the two brake pins 700 extend out of the brake pipe 400 at the same time, and each brake pin 700 engages with the locking part 221 on one wheel 200. This achieves simultaneous braking or unlocking of the two wheels 200 with good synchronization and better locking effect for strollers, making it safer and more reliable.

[0046] As an optional technical solution, see Figure 4 , Figure 6 and Figure 7 Each brake pin 700 includes a fixing seat 710, a connecting member 720, and a locking pin 730. The fixing seat 710 has two through first mounting holes 712 on its circumferential sidewall, the two first mounting holes 712 facing each other. A limiting pin 600 passes through the two first mounting holes 712 and simultaneously passes through the first guide groove 410 and the second guide groove 510, thereby allowing the limiting pin 600 to drive the brake pin 700 to move axially along the brake pipe 400. The fixing seat 710 extends along its length... Figure 3 , Figure 5 An opening 711 is provided on one side of the wheel 200 (shown in the first direction). One end of the locking pin 730 is installed into the fixed seat 710 through the opening 711. The connecting piece 720 fixes the fixed seat 710 and the locking pin 730 together. The other end of the locking pin 730 cooperates with the locking part 221 on the wheel 200 to achieve braking or releasing of the wheel 200. The length direction of the fixed seat 710 is the same as the axial direction of the brake pipe 400, and the through direction of the first mounting hole 712 is perpendicular to the axial direction of the brake pipe 400.

[0047] The mounting portion 740 is disposed on the outer wall of the fixed seat 710 on the side opposite to the opening 711. The two ends of the elastic reset member 800 are respectively sleeved on the mounting portion 740 of the fixed seat 710 of one brake pin 700. Thus, the elastic reset member 800 can simultaneously apply elastic force to both brake pins 700, with the direction of the elastic force being the same as the axial direction of the brake pipe 400. For example, the elastic reset member 800 can be a spring. The mounting portion 740 is columnar, and its cross-section is cross-shaped or star-shaped. The end of the elastic reset member 800 is sleeved on the mounting portion 740. By setting the cross-section of the mounting portion 740 to a cross-shaped or star-shaped pattern, the fixing effect of the elastic reset member 800 on the mounting portion 740 can be improved, and the elastic reset member 800 is less likely to detach from the mounting portion 740.

[0048] Furthermore, in this embodiment, the circumferential sidewall of the fixed base 710 is provided with two opposing second mounting holes 713, the connecting member 720 is a fixing pin, and the locking pin 730 has a through fixing hole 731 at one end extending into the fixed base 710. The fixing pin passes through the fixing hole 731 on the locking pin 730 and the two second mounting holes 713 on the fixed base 710, thereby realizing a detachable connection between the fixed base 710 and the locking pin 730. Of course, in other embodiments, the connecting member 720 can also be a screw, and the fixing hole 731 is a threaded hole. The screw passes through the second mounting hole 713 and engages with the fixing hole 731 threadedly. It should be noted that the end of the connecting member 720 must not extend beyond the circumferential sidewall of the fixed base 710; otherwise, the connecting member 720 will interfere with the brake pipe 400, and the brake pin 700 will encounter resistance when moving within the brake pipe 400, resulting in poor transmission.

[0049] Continue to see Figure 4 , Figure 6 and Figure 7 In this embodiment, both the limiting pin 600 and the rotating seat 500 include two units. Each limiting pin 600 and rotating seat 500 corresponds one-to-one with the brake pin 700. Each limiting pin 600 passes through a fixing seat 710 of a brake pin 700 and a rotating seat 500. The brake tube 400 has four first guide grooves 410, with two first guide grooves 410 forming a group. Each rotating seat 500 has two second guide grooves 510, with two second guide grooves 510 forming a group. Each limiting pin 600 passes through one group of first guide grooves 410, one group of second guide grooves 510, and one brake pin 700. That is, the two ends of the limiting pin 600 extend beyond the fixing seat 710 of the brake pin 700 and the brake tube 400, and engage with the groove walls of the two second guide grooves 510 on the rotating seat 500. This arrangement ensures the uniformity of force on the brake pin 700, accurate movement trajectory of the brake pin 700, and high transmission precision.

[0050] Continue to see Figure 6In this embodiment, the first guide groove 410 is a strip-shaped groove. The length direction of the first guide groove 410 is the same as the axial direction of the brake pipe 400. Figure 5 The first direction shown.

[0051] See Figure 4 and Figure 8 In this embodiment, the second guide groove 510 is a triangular groove. One of the groove walls of the second guide groove 510 includes a guide inclined surface 511. The guide inclined surface 511 is set at an angle to the axial direction of the rotating seat 500. The rotating seat 500 is coaxial with the brake pipe 400, and the axial direction of the rotating seat 500 is... Figure 3 The first direction is shown in the diagram. When the drive member 300 drives the rotating seat 500 to rotate clockwise on the brake pipe 400, the limiting pin 600 will move along the guide slope 511 from the first end of the second guide groove 510 to the second end of the second guide groove 510. At the same time, the limiting pin 600 will move along the groove wall of the first guide groove 410 from the first end of the first guide groove 410 to the second end of the first guide groove 410. Since the limiting pin 600 is connected to the fixing seat 710 of the brake pin 700, the limiting pin 600 will push the locking pin 730 of the brake pin 700 out of the brake pipe 400 to cooperate with the locking part 221 on the wheel 200.

[0052] Furthermore, a protrusion 512 is provided between the first end of the second guide groove 510 and the guide slope 511. When the rotating seat 500 rotates under the drive of the drive member 300, the limiting pin 600 passes over the protrusion 512 from the first end of the second guide groove 510 and moves along the guide slope 511 to the second end of the second guide groove 510. By providing the protrusion 512, the limiting pin 600 needs a larger force to move from the first end of the second guide groove 510 to the guide slope 511, and then to the second end of the second guide groove 510, which increases the reliability of the braking device and avoids the wheel 200 being stopped due to accidental contact with the drive member 300.

[0053] See Figure 3 , Figure 8 and Figure 9 In this embodiment, the driving component 300 includes a foot pedal 310 and a first mounting cylinder 320. The foot pedal 310 is fixedly connected to the first mounting cylinder 320, which is sleeved on the outside of the rotating seat 500 and engaged with it. By stepping on the foot pedal 310, the first mounting cylinder 320 can be rotated, which in turn drives the rotating seat 500 to rotate clockwise around the brake pipe 400. The limiting pin 600 moves from the first end of the second guide groove 510, past the protrusion 512, along the guide slope 511 to the second end of the second guide groove 510. Optionally, the foot pedal 310 and the first mounting cylinder 320 can be an integral structure.

[0054] Continue to see Figure 8 and Figure 9 The inner wall of the first mounting cylinder 320 is provided with a first protruding rib 321. The first protruding rib 321 is annular and coaxial with the first mounting cylinder 320. The two rotating seats 500 respectively abut against the two end faces of the first protruding rib 321 along its axial direction. The axial direction of the first protruding rib 321 is the first direction mentioned above.

[0055] Furthermore, the inner wall of the first mounting cylinder 320 is provided with a second protruding rib 322, which is strip-shaped and extends in the first direction. The rotating seat 500 is provided with a limiting groove 520 that mates with the second protruding rib 322. Optionally, there are two second protruding ribs 322, and correspondingly, there are two limiting grooves 520 on the rotating seat 500. To ensure uniform force distribution, the two second protruding ribs 322 are arranged opposite to each other on the inner wall of the first mounting cylinder 320, and the two limiting grooves 520 are arranged opposite to each other on the outer wall of the rotating seat 500. Of course, in other embodiments, the first mounting cylinder 320 and the rotating seat 500 can also be connected by other snap-fit ​​structures.

[0056] See Figure 2 and Figure 10 In this embodiment, the wheel 200 includes a wheel seat 210 and a wheel 220. The wheel seat 210 includes a second mounting cylinder 211 and a fixing ear 212. One end of the second mounting cylinder 211 is sleeved on the brake pipe 400 and detachably connected to the brake pipe 400. The other end of the second mounting cylinder 211 is detachably connected to the wheel 220, allowing the wheel 220 to rotate on the wheel seat 210. The fixing ear 212 is disposed on the peripheral side wall of the second mounting cylinder 211 and is detachably connected to the connector 110 on the frame 100. Exemplarily, the fixing ear 212 can be connected to the connector 110 via a pin. The wheel hub of the wheel 220 has a locking part 221 on the side near the wheel seat 210. The locking part 221 can be a slot or a socket, which can cooperate with the locking pin 730 to achieve braking or releasing of the wheel 200. When the locking pin 730 extends out of the brake pipe 400 and inserts into the locking part 221, the wheel 220 cannot rotate; when the locking pin 730 retracts back into the brake pipe 400, the locking pin 730 exits from the locking part 221, and the wheel 220 can rotate freely.

[0057] Optionally, in this embodiment, the wheel 200 is the rear wheel of the stroller. There are two wheels 200. The wheel seats 210 of the two wheels 200 are sleeved from both sides of the brake pipe 400 in the axial direction to the outside of the brake pipe 400. The second mounting cylinder 211 of each wheel seat 210 abuts against one end of the first mounting cylinder 320 of the drive member 300, thereby realizing the installation of the wheel 200 and the brake device on the frame 100.

[0058] Furthermore, the second mounting cylinder 211 is provided with a third mounting hole 2111, and the brake pipe 400 is provided with a fourth mounting hole 420. A pin (not shown in the figure) passing through the third mounting hole 2111 and the fourth mounting hole 420 can fix the brake pipe 400 and the wheel seat 210. Of course, in other embodiments, screws can also be used to fix the brake pipe 400 and the wheel seat 210. The fourth mounting hole 420 is a threaded hole, and the screw, after passing through the third mounting hole 2111, engages with the threaded connection of the fourth mounting hole 420.

[0059] This embodiment also provides a stroller, see [link / reference] Figure 1 and Figure 2 The stroller includes a frame 100, wheels 200, and the aforementioned braking device. The wheels 200 are mounted on the frame 100, and the braking device is connected to the wheels 200 and used to stop or release the wheels 200. By adopting the aforementioned braking device, precise power transmission can be achieved, braking operation is flexible, the failure rate is low, and the stroller has high safety and reliability.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A braking device, mounted on a vehicle frame (100), for stopping or releasing a wheel (200), wherein the wheel (200) is provided with a locking part (221), characterized in that, The braking device includes: Drive unit (300); A transmission assembly, comprising a brake pipe (400), a rotating seat (500), and a limiting pin (600), wherein the rotating seat (500) is rotatably sleeved on the brake pipe (400), the brake pipe (400) has a first guide groove (410), the rotating seat (500) has a second guide groove (510), the limiting pin (600) passes through the first guide groove (410) and the second guide groove (510), and the rotating seat (500) is drively connected to the driving member (300); and A brake assembly, comprising a brake pin (700) and an elastic reset member (800), wherein the brake pin (700) and the elastic reset member (800) are installed inside the brake tube (400), the brake pin (700) is retractable relative to the brake tube (400), and the brake pin (700) is throttle-connected to the limiting pin (600); When the braking device is in the first working position, the limiting pin (600) is located at the first end of the first guide groove (410) and the first end of the second guide groove (510). Under the action of the limiting pin (600), the brake pin (700) retracts into the brake tube (400), the elastic reset member (800) is compressed, the brake pin (700) disengages from the locking part (221), and the wheel (200) is in the released braking state. When the braking device is in the second working position, the limiting pin (600) is located at the second end of the first guide groove (410) and the second end of the second guide groove (510). The brake pin (700) extends out of the brake pipe (400) under the elastic force of the elastic reset member (800) and cooperates with the locking part (221). The wheel (200) is in a stopped state.

2. The braking device according to claim 1, characterized in that, The wheel (200) includes two, and the brake assembly includes two brake pins (700) and an elastic reset member (800). Each of the two brake pins (700) has a mounting part (740) at one end close to the other. The two ends of the elastic reset member (800) are respectively connected to the mounting part (740) on one of the brake pins (700). The elastic reset member (800) allows the two brake pins (700) to extend out of the brake tube (400) at the same time. Each brake pin (700) cooperates with the locking part (221) on one of the wheels (200).

3. The braking device according to claim 2, characterized in that, The brake pin (700) includes a fixed seat (710), a connector (720), and a locking pin (730). The fixed seat (710) has an opening (711) on one side. One end of the locking pin (730) is installed into the fixed seat (710) through the opening (711). The connector (720) fixes the fixed seat (710) and the locking pin (730) together. The other end of the locking pin (730) cooperates with the locking part (221). The mounting part (740) is disposed on the outer wall of the fixed seat (710) on the side away from the opening (711).

4. The braking device according to claim 3, characterized in that, The mounting part (740) is columnar, and the cross-section of the mounting part (740) is cross-shaped or star-shaped. The elastic reset member (800) is sleeved on the mounting part (740).

5. The braking device according to claim 2, characterized in that, The limiting pin (600) and the rotating seat (500) each include two, and the limiting pin (600), the rotating seat (500) and the brake pin (700) correspond one-to-one. The brake tube (400) is provided with four first guide grooves (410), and every two first guide grooves (410) form a group. Each rotating seat (500) is provided with two second guide grooves (510), and the two second guide grooves (510) form a group. Each limiting pin (600) passes through a group of first guide grooves (410), a group of second guide grooves (510) and a brake pin (700).

6. The braking device according to claim 1, characterized in that, The first guide groove (410) is a strip-shaped groove, and the length direction of the first guide groove (410) is the same as the axial direction of the brake pipe (400); The second guide groove (510) is a triangular groove. The second guide groove (510) includes a guide inclined surface (511). The guide inclined surface (511) is set at an angle to the axial direction of the rotating seat (500). The rotating seat (500) is coaxial with the brake pipe (400).

7. The braking device according to claim 6, characterized in that, A protrusion (512) is provided between the first end of the second guide groove (510) and the guide inclined surface (511). When the rotating seat (500) rotates under the drive of the driving member (300), the limiting pin (600) passes over the protrusion (512) from the first end of the second guide groove (510) and moves along the guide inclined surface (511) to the second end of the second guide groove (510).

8. The braking device according to claim 1, characterized in that, The drive unit (300) includes a foot pedal (310) and a first mounting cylinder (320). The foot pedal (310) is fixedly connected to the first mounting cylinder (320), and the first mounting cylinder (320) is sleeved on the outside of the rotating seat (500) and engaged with the rotating seat (500).

9. The braking device according to claim 1, characterized in that, The wheel (200) includes a wheel seat (210) and a wheel (220). The wheel seat (210) includes a second mounting cylinder (211). One end of the second mounting cylinder (211) is sleeved on the outside of the brake pipe (400) and detachably connected to the brake pipe (400). The other end of the second mounting cylinder (211) is detachably connected to the wheel (220).

10. A baby stroller, characterized in that, The device includes a frame (100), a wheel (200), and a braking device according to any one of claims 1-9, wherein the wheel (200) is mounted on the frame (100), and the braking device is connected to the wheel (200) and is used to stop or release the wheel (200).

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