Brake device of a carrier and wheel assembly of a carrier

Abstract

The utility model discloses a kind of brake devices of carrier, wheel seat upper portion is equipped with connecting column, wheel seat lower portion is equipped with wheel fork, wheel fork is connected with wheel, wheel is equipped with multiple brake inner tooth grooves in circumferential direction on wheel, sliding sheet that can slide relative thereto is equipped on wheel fork, brake pin is equipped on sliding sheet, sliding rod that can slide in it is equipped in connecting column, sliding block that can follow sliding when sliding rod slides downward is equipped on wheel fork upper portion, rotating block is rotatably connected in sliding block side portion, the cooperation groove that can swing in rotating block is equipped in sliding sheet upper end, rotating block lower end and cooperation groove groove wall abut so that when sliding rod pushes sliding block downward, sliding block pushes sliding sheet sliding through rotating block lower end, first reset spring is equipped between wheel fork and sliding block, second reset spring is equipped between sliding sheet and wheel fork. The utility model also discloses wheel assembly using the aforementioned brake device. The utility model is convenient to operate when releasing brake or braking.

Description

Technical Field

[0001] This utility model relates to a braking device for a vehicle. This utility model also relates to a wheel assembly for a vehicle. Background Technology

[0002] Vehicles are common products in people's lives, such as strollers. Strollers allow users to place children in the seat and push them around. For safety, most strollers are equipped with brakes; however, traditional brakes only activate when the wheels are in a specific direction. For omnidirectional wheels that can rotate 360 ​​degrees horizontally, traditional brakes cannot provide instant braking, making them inconvenient to use.

[0003] Therefore, this utility model was created based on the above-mentioned shortcomings. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a braking device for a vehicle with a simple structure. This braking device is easy to operate when releasing or braking, and its operation is smooth and stable.

[0005] This utility model also provides a wheel assembly for a vehicle with a simple structure. The wheel assembly of the vehicle is easy to operate when releasing the brake or braking, and the movement is smooth and stable.

[0006] This utility model is achieved through the following technical solution:

[0007] A braking device for a vehicle includes a wheel seat, a connecting post for connecting to a vehicle frame on the upper part of the wheel seat, a wheel fork on the lower part of the wheel seat, a wheel connected to the wheel fork, a plurality of brake internal tooth grooves on the wheel along the circumferential direction, a sliding plate on the wheel fork that can slide relative to it, a brake pin on the sliding plate that can engage or disengage with the brake internal tooth grooves when it slides, a sliding rod that can slide inside the connecting post, a sliding block on the upper part of the wheel fork that can slide along with the sliding rod when it slides downward, a rotating block rotatably connected to the side of the sliding block, a mating groove on the upper end of the sliding plate that allows the rotating block to swing inside, the lower end of the rotating block abutting against the groove wall so that when the sliding rod pushes the sliding block downward, the sliding block slides by pushing the sliding plate through the lower end of the rotating block, a first return spring between the wheel fork and the sliding block that can push the sliding block upward to reset, and a second return spring between the sliding plate and the wheel fork that can push the sliding plate upward to reset.

[0008] The lower end of the rotating block is semi-circular, the mating groove is an open groove that is wider at the top and narrower at the bottom, and the bottom shape of the mating groove is adapted to the lower end of the rotating block.

[0009] The lower end of the sliding rod abuts against the upper surface of the sliding block.

[0010] The wheel fork includes two spaced-apart fork pieces. A connecting frame is provided on the upper part of the fork pieces to connect the two pieces. The sliding block is disposed in the connecting frame. One end of the first return spring abuts against the lower side of the sliding block, and the other end abuts against the connecting frame. The sliding piece is disposed on the fork piece along the length direction of the fork piece. One end of the second return spring abuts against the sliding piece, and the other end abuts against the protrusion on the fork piece.

[0011] A wheel assembly for a vehicle includes a vehicle frame, the vehicle frame including a cross tube and fixed seats fixedly disposed at both ends of the cross tube, each of the fixed seats being connected to a braking device of the vehicle as claimed in any one of the claims, a connecting post being inserted into the fixed seat, a push rod being slidably disposed within the cross tube, the push rod having a first inclined surface that can push a sliding rod downward when it slides, the cross tube also having a pedal assembly that can drive the push rod to slide when stepped on, and a third return spring that can push the push rod to slide back to its original position within the cross tube.

[0012] The pedal assembly includes a housing fixedly connected to the middle of the horizontal tube. The housing contains a pedal block that can slide inside the housing when stepped on. A fourth return spring is provided between the pedal block and the housing, which can push the pedal block to move upward. The pedal block has second inclined surfaces on both sides that can push the push rod to slide when it slides downward.

[0013] The step block and the housing are provided with a positioning structure that can position the step block. The positioning structure includes a first locking position on the housing and a second locking position below the first locking position. The lower end of the step block and extending along the length of the horizontal tube are provided with a strip hole. The strip hole is provided with a positioning post that can move inside it and alternately stop in the first locking position and the second locking position when the step block is stepped on.

[0014] The housing is provided with an annular groove, and the first and second locking positions are provided on the side wall of the annular groove and configured such that: in the initial state, the positioning post is engaged with the first locking position; when the foot block is stepped down and released, the positioning post moves along the annular groove and moves to the second locking position under the action of the fourth return spring; when the foot block is stepped down and released again, the positioning post continues to move along the annular groove and returns to the first locking position under the action of the fourth return spring.

[0015] The annular groove includes a first slide section, a second slide section, a third slide section, a fourth slide section, a fifth slide section, and a sixth slide section connected in sequence and allowing the positioning post to circulate within it. The first locking position is located at the junction of the first and sixth slide sections. The housing has a first blocking part that prevents the positioning post from returning to the second slide section when the positioning post reaches the bottom of the third slide section and the fourth return spring pushes the foot block upward. The first blocking part has a first guide sidewall that guides the positioning post into the upper end of the fourth slide section. The second locking position is located at the upper end of the fourth slide section. The housing also has a second blocking part that prevents the positioning post from returning to the fourth slide section when the positioning post moves downward to the bottom of the fourth slide section and the fourth return spring pushes the foot block upward. The second blocking part has a second guide sidewall that guides the positioning post into the fifth slide section. The fifth, sixth, and first slide sections are interconnected, so that the positioning post entering the fifth slide section returns to the first locking position where the first and sixth slide sections meet under the action of the fourth return spring.

[0016] The housing includes a front inner shell and a front outer shell fixed to the outside of the front inner shell. The housing also includes a rear inner shell and a rear outer shell fixed to the outside of the rear inner shell. The front inner shell and the rear inner shell are connected to form a slide for the pedal block to slide inside. A side hole communicating with the slide and allowing the push rod to be inserted is provided between the front inner shell and the rear inner shell. Both the front outer shell and the rear outer shell are provided with the annular groove that cooperates with the positioning post.

[0017] Compared with the prior art, the present invention has the following advantages: When braking, the braking device of the vehicle of the present invention causes the sliding rod to slide downward in the connecting column, which pushes the sliding block to move downward. The first return spring is compressed, the sliding block and the rotating block rotate relative to each other and push the rotating block. The lower end of the rotating block pushes the sliding plate to move along the wheel fork, and the second return spring is compressed, which causes the sliding plate to drive the brake pin to disengage from the brake inner tooth groove, thus completing the brake release action. When the force applied to the sliding rod is released, the first return spring pushes the sliding block and the sliding rod to return to their original position. The rotating block no longer pushes the sliding plate downward, and the sliding plate slides upward to return to its original position under the action of the second return spring. The brake pin engages with the brake inner tooth groove again, realizing braking. The sliding rod passes inside the connecting column. Even if the connecting column rotates 360 degrees relative to the vehicle frame, the brake can be released as long as the sliding rod applies a downward force. This allows for brake release anytime and anywhere, avoiding the inconvenience of traditional braking devices when braking or releasing the swivel wheels. Furthermore, a rotating block is rotatably connected to the sliding block. The rotating block pushes the sliding plate, ensuring that the longitudinal movement of the sliding rod and sliding block is smoothly transmitted to the sliding plate, causing it to move in the inclined direction. This makes the brake release operation smooth and stable. Moreover, the wheel assembly of this vehicle uses the aforementioned braking device. To release the brake, simply stepping on the pedal pushes the push rod laterally, which in turn pushes the sliding rod downward. Therefore, releasing the brake is as simple as stepping on a pedal, allowing the swivel wheels to be released anytime and anywhere – a very convenient and quick operation. Attached Figure Description

[0018] Figure 1 This is a perspective view of the braking device of the vehicle of this utility model;

[0019] Figure 2 This is a side view of the braking device of the vehicle of this utility model in the braking state;

[0020] Figure 3 This is a side view of the vehicle's braking device in the released braking state.

[0021] Figure 4 This is an exploded view of the braking device of the vehicle of this utility model;

[0022] Figure 5 This is a perspective view of the wheel assembly of the vehicle of this utility model;

[0023] Figure 6 This is an exploded view of the wheel assembly of the vehicle of this utility model;

[0024] Figure 7 This is a partial sectional view of the wheel assembly of the vehicle of this utility model;

[0025] Figure 8This is a perspective view of the wheel assembly of the vehicle of this utility model;

[0026] Figure 9 This is one of the exploded views of the wheel assembly of the vehicle of this utility model;

[0027] Figure 10 This is the second exploded view of the wheel assembly of the vehicle of this utility model;

[0028] Figure 11 This is the third exploded view of the wheel assembly of the vehicle of this utility model;

[0029] Figure 12 This is a side view of a component of the wheel assembly of the novel vehicle of this utility model. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings:

[0031] like Figures 1 to 4 As shown, a braking device 6 for a vehicle includes a wheel seat 61, a connecting post 62 on the upper part of the wheel seat 61, and a wheel fork 63 on the lower part of the wheel seat 61. A wheel 64 is connected to the wheel fork 63. The connecting post 62 is used to connect to the vehicle frame 2, so that the wheel seat 61 can rotate 360 ​​degrees relative to the vehicle frame 2 in the horizontal direction through the connecting post 62, which facilitates the vehicle to change its direction of travel. In this embodiment, the vehicle is a stroller.

[0032] like Figures 1 to 4 As shown, the wheel 64 has multiple brake internal tooth grooves 65 along its circumference, and the wheel fork 63 has a sliding plate 66 that can slide relative to it. The sliding plate 66 has a brake pin 67. When the sliding plate 66 slides along the wheel fork 63, the sliding plate 66 drives the brake pin 67 to engage or disengage from the brake internal tooth grooves 65. In this embodiment, when the sliding plate 66 slides downward, the brake pin 67 disengages from the brake internal tooth grooves 65; when the sliding plate 66 slides upward, the brake pin 67 engages with the brake internal tooth grooves 65.

[0033] like Figures 1 to 4As shown, the connecting post 62 has a sliding rod 68 that can slide within it. The upper part of the wheel fork 63 has a sliding block 69 that can slide along with the sliding rod 68 when it slides downward. A rotating block 60 is rotatably connected to the side of the sliding block 69. The upper end of the sliding plate 66 has a mating groove 601 that allows the rotating block 60 to swing within it. The lower end of the rotating block 60 abuts against the groove wall of the mating groove 601. A first return spring 6a that can push the sliding block 69 upward to reset is provided between the wheel fork 63 and the sliding block 69. A second return spring 6b that can push the sliding plate 66 upward to reset is provided between the sliding plate 66 and the wheel fork 63. In the initial state of this embodiment, the brake pin 67 is engaged with the brake inner tooth groove 65 and is in a braking state. When the sliding plate 66 slides downward, the brake is released. Alternatively, an external brake tooth groove can be provided on the wheel 64 along the circumferential direction to replace the internal brake tooth groove. With this design, the brake pin 67 remains disengaged from the external brake tooth groove in the initial state, and the brake is released in the initial state. When the sliding plate 66 slides down, the brake is completed. The specific operation for releasing the brake in this embodiment is as follows: A downward force is applied to the sliding rod 68, which pushes the sliding block 69 downward. The sliding block 69 then pushes the rotating block 60. Since the moving directions of the sliding rod 68 and the sliding block 69 have a certain angle with the extending direction of the sliding piece 66, when the sliding block 69 pushes the rotating block 60, the rotating block 60 and the sliding block 69 rotate relative to each other. The rotating block 60 swings within the mating groove 601, and the lower end of the rotating block 60 pushes the sliding piece 66 downward. The sliding piece 66 then drives the brake pin 67 to disengage from the brake inner tooth groove 65. At this time, the brake is released. During this process, both the first return spring 6a and the second return spring 6b are compressed. When the external force on the sliding rod 68 is removed, the first return spring 6a pushes the sliding block 69 and the sliding rod 68 to return upward. The rotating block 60 and the sliding block 69 rotate relative to each other and release the sliding piece 66. The second return spring 6b pushes the sliding piece 66 to return upward. The brake pin 67 engages with the brake inner tooth groove 65 again to complete the braking. Because the sliding rod 68 is located inside the connecting post 62, the brake release action can be completed as long as the sliding rod 68 slides downward, regardless of the position of the wheel seat 61 and the wheel fork 63 with the wheel 64. This is suitable for releasing the brake or performing braking operations on a swivel wheel structure. Moreover, the rotatable connection between the rotating block 60 and the sliding block 69 allows the longitudinal movement of the sliding rod 68 and the sliding block 69 to be smoothly transmitted to the sliding plate 66, causing the sliding plate 66 to move in the inclined direction, making the brake release operation smooth and stable.

[0034] like Figure 2 and Figure 3As shown, the lower end of the rotating block 60 is semi-circular, and the mating groove 601 is an open groove that is wider at the top and narrower at the bottom. The bottom shape of the mating groove 601 is adapted to the lower end of the rotating block 60. When the sliding block 69 slides up or down, the rotating block 60 swings within the mating groove 601, thereby releasing the sliding piece 66 upward or pushing the sliding piece 66 downward.

[0035] like Figure 4 and Figure 7 As shown, the lower end of the sliding rod 68 abuts against the upper surface of the sliding block 69. Of course, the sliding rod 68 can also be fixedly connected to the sliding block 69.

[0036] like Figure 4 and Figure 7 As shown, the wheel fork 63 includes two spaced-apart fork pieces 631. A connecting frame 632 is provided on the upper part of the fork pieces 631 to connect the two. The sliding block 69 is disposed in the connecting frame 632. One end of the first return spring 6a abuts against the lower side of the sliding block 69, and the other end abuts against the connecting frame 632. The sliding piece 66 is disposed on the fork piece 631 along the length direction of the fork piece 631. One end of the second return spring 6b abuts against the sliding piece 66, and the other end abuts against the boss 633 on the fork piece 631.

[0037] like Figures 1 to 10 As shown, this embodiment also discloses a wheel assembly for a vehicle, including a vehicle frame 2. The vehicle frame 2 includes a horizontal tube 21 and fixed seats 22 fixedly disposed at both ends of the horizontal tube 21. Each fixed seat 22 is connected to a braking device 6 of the vehicle as described above. A connecting post 62 is inserted into the fixed seat 22. A push rod 3 is slidably disposed inside the horizontal tube 21. The push rod 3 has a first inclined surface 31 that can push a sliding rod 68 downward when it slides. The horizontal tube 21 is also provided with a pedal assembly 4 that can drive the push rod 3 to slide when stepped on. A third return spring 5 is also provided inside the horizontal tube 21 that can push the push rod 3 to slide back to its original position. When it is necessary to release the brake, by stepping on the pedal assembly 4, the pedal assembly 4 pushes the push rod 3 to move laterally. The first inclined surface 31 on the push rod 3 pushes the upper end of the sliding rod 68, thereby causing the sliding rod 68 to slide downward, thus completing the operation of releasing the brake.

[0038] like Figures 9 to 11 As shown, the pedal assembly 4 includes a housing 41 fixedly connected to the middle of the horizontal tube 21. The housing 41 is provided with a foot block 42 that can slide inside the housing 41 when stepped on. A fourth return spring 43 that can push the foot block 42 to move upward is provided between the foot block 42 and the housing 41. The foot block 42 is provided with a second inclined surface 44 on both sides that can push the push rod 3 to slide when it slides downward.

[0039] like Figures 9 to 12 As shown, a positioning structure is provided between the pedal block 42 and the housing 41 to position the pedal block 42, so that the pedal block 42 can stay in the desired position after being stepped on, so as to maintain the braking state or the released state. Specifically, the positioning structure includes a first locking position 451 provided on the housing 41 and a second locking position 452 located below the first locking position 451. The lower end of the pedal block 42 and extending along the length direction of the horizontal tube 21 are provided with a strip hole 454. The strip hole 454 is provided with a positioning post 453 that can move within it and can alternately stay in the first locking position 451 and the second locking position 452 when the pedal block 42 is stepped on. In the initial braking state, the positioning pin 453 remains in the first locking position 451, and the push rod 3 does not apply force to the sliding rod 68. When it is necessary to release the brake, the pedal block 42 is pressed. During the downward movement of the pedal block 42, it pushes the push rod 3 laterally through the second inclined surface 44. The push rod 3 applies a downward force to the sliding rod 68 to release the brake. As the pedal block 42 moves downward, the positioning pin 453 enters the second locking position 452. At this time, even after the pedal block 42 is released, its position is maintained, so that the push rod 3 maintains a pushing force on the sliding rod 68, thereby ensuring that the brake is released. When it is necessary to brake again, the pedal block 42 is pressed again. The positioning pin 453 exits from the second locking position 452, and under the action of the four return springs 43, the pedal block 42 slides upward to reset, and the positioning pin 453 returns to the first locking position 451. Therefore, by pressing the pedal block 42, the positioning post 453 can alternately stop in the first locking position 451 and the second locking position 452, so that the braking state or the brake release state can be maintained. Whether braking or releasing the brake, you only need to press the pedal block 42, which is very convenient and quick to operate.

[0040] like Figure 10 and Figure 12As shown, the housing 41 is provided with an annular groove 45. The first locking position 451 and the second locking position 452 are provided on the side wall of the annular groove 45 and are configured such that: in the initial state, the positioning post 453 is engaged with the first locking position 451; when the foot block 42 is stepped down and released, the positioning post 453 moves along the annular groove 45 and moves to the second locking position 452 under the action of the fourth return spring 43; when the foot block 42 is stepped down and released again, the positioning post 453 continues to move along the annular groove 45 and returns to the first locking position 451 under the action of the fourth return spring 43. Specifically, the annular groove 45 includes a first sliding groove section 45a, a second sliding groove section 45b, a third sliding groove section 45c, a fourth sliding groove section 45d, a fifth sliding groove section 45e, and a sixth sliding groove section 45f, which are connected in sequence and allow the positioning post 453 to circulate within it. The first locking position 451 is located at the junction of the first sliding groove section 45a and the sixth sliding groove section 45f. The housing 41 is provided with a first blocking part 45g that prevents the positioning post 453 from returning to the second sliding groove section 45b when the positioning post 453 reaches the bottom of the third sliding groove section 45c and the fourth return spring 43 pushes the foot block 42 upward. The first blocking part 45g is provided with a first guide sidewall 45 that guides the positioning post 453 into the upper end of the fourth sliding groove section 45d. h, the second locking position 452 is located at the upper end of the fourth slide section 45d. The housing 41 is also provided with a second blocking part 45i that can prevent the positioning post 453 from returning to the fourth slide section 45d when the positioning post 453 moves downward to the bottom of the fourth slide section 45d and the step block 42 is pushed upward by the fourth return spring 43. The second blocking part 45i is provided with a second guide sidewall 45j that can guide the positioning post 453 into the fifth slide section 45e. The fifth slide section 45e, the sixth slide section 45f and the first slide section 45a are interconnected so that the positioning post 453 entering the fifth slide section 45e returns to the first locking position 451 where the first slide section 45a and the sixth slide section 45f are connected under the action of the fourth return spring 43.When the foot pedal 42 is pressed, the positioning pin 453 moves downward along the first slide section 45a, passes through the second slide end 45b, and enters the third slide section 45c. After reaching the bottom of the third slide section 45c, the foot pedal 42 is released, and the foot pedal 42 moves upward under the action of the fourth return spring 43. At this time, the first blocking part 45g will block the positioning pin 453 and cause the positioning pin 453 to move upward along the first guide side wall 45h to the second locking position 452. During this process, the positioning pin 453 moves laterally in the strip hole 454. When the positioning pin 453 stops at the second locking position 452, the position of the foot pedal 42 is maintained, and the push rod 3 maintains a force on the sliding rod 68. When the stroller remains in the released state, and braking is required again, the pedal block 42 is pressed down again. The positioning pin 453 moves downward to the bottom of the fourth slide section 45d. Then, the pedal block 42 is released, and it moves upward under the action of the fourth return spring 43. At this point, the second blocking part 45i blocks the positioning pin 453 and guides it through the second guide side wall 45j into the fifth slide section 45e. Then, under the action of the fourth return spring 43, it passes through the sixth slide section 45f and enters the first locking position 451 where the first slide section 45a and the sixth slide section 45f meet. At this point, the pedal block 42 is positioned, the push rod 3 removes its force on the sliding rod 68, completing the braking process and maintaining the braking state. By pressing the pedal block 42 twice, the positioning pin 453 completes one full rotation within the annular groove 45, achieving one switch between braking and releasing the stroller.

[0041] like Figure 10 As shown, the housing 41 includes a front inner shell 411 and a front outer shell 412 fixed to the outside of the front inner shell 411. The housing 41 also includes a rear inner shell 413 and a rear outer shell 414 fixed to the outside of the rear inner shell 413. The front inner shell 411 and the rear inner shell 413 are connected to form a slide 46 for the pedal block 42 to slide inside. A side hole 47 communicating with the slide 46 and for inserting the push rod 3 is provided between the front inner shell 411 and the rear inner shell 413. Both the front outer shell 412 and the rear outer shell 414 are provided with an annular groove 45 that cooperates with the positioning post 453. The pedal block 42 is provided with a longitudinal guide groove 421. The housing 41 is provided with a guide block 415 that cooperates with the guide groove 421, so that the pedal block 42 moves up and down smoothly.

[0042] like Figure 1 , Figure 7 and Figure 8As shown, the connecting post 62 and the fixing seat 21 are detachably connected, allowing for complete replacement of the wheel 64 in case of damage. The connecting post 62 has an annular groove 71, and a locking piece 72 is laterally slidable within the fixing seat 21. The locking piece 72 has a through hole 73 through which the fixing post 62 passes. When the locking piece 72 slides, the edge of the through hole 73 engages or disengages from the annular groove 71. An exposed operating piece 74 is connected to the locking piece 72. A fifth return spring 75 is provided between the locking piece 72 and the fixing seat 21 to push the locking piece 72 back to its original position. The fixing seat 21 also has a longitudinal limiting post 76, and the locking piece 72 has a limiting hole 77 that mates with the limiting post 76. When disassembly is required, simply press the operating piece 74 to slide the locking piece 72, causing the edge of the through hole 73 to exit the annular groove 71. Then, the connecting post 2 can be pulled downwards, allowing the wheel seat 61, wheel fork 63, and wheel 64 to be removed. When the connecting post 62 is connected to the fixed base 21, the edge of the through hole 73 is stuck in the annular groove 71, which can prevent the connecting post 62 from coming off downward.

[0043] like Figure 1 As shown, the wheel seat 61 is rotatably connected to the upper end of the fork 631. A shock-absorbing spring 6c is provided between the wheel seat 61 and the connecting frame 632 and on the side where the wheel seat 61 and the fork 631 meet. When encountering uneven ground, the shock-absorbing spring 6c can play a shock-absorbing role, making the child in the stroller comfortable.

[0044] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A braking device (6) for a vehicle, characterized in that: The device includes a wheel seat (61), the upper part of which is provided with a connecting post (62) for connecting to the vehicle frame (2), the lower part of which is provided with a wheel fork (63), a wheel (64) connected to the wheel fork (63), the wheel (64) having multiple brake internal tooth grooves (65) along the circumferential direction, the wheel fork (63) having a sliding plate (66) that can slide relative to it, the sliding plate (66) having a brake pin (67) that can engage or disengage with the brake internal tooth grooves (65) when it slides, the connecting post (62) having a sliding rod (68) that can slide inside it, and the upper part of the wheel fork (63) having a sliding rod that can slide along with the sliding rod (68) when it slides downward. A sliding block (69) is rotatably connected to a rotating block (60) on its side. The upper end of the sliding plate (66) is provided with a mating groove (601) that allows the rotating block (60) to swing within it. The lower end of the rotating block (60) abuts against the groove wall of the mating groove (601) so that when the sliding rod (68) pushes the sliding block (69) downward, the sliding block (69) slides by pushing the sliding plate (66) with the lower end of the rotating block (60). A first return spring (6a) that can push the sliding block (69) upward reset is provided between the wheel fork (63) and the sliding block (69). A second return spring (6b) that can push the sliding plate (66) upward reset is provided between the sliding plate (66) and the wheel fork (63).

2. The braking device (6) of the vehicle according to claim 1, characterized in that: The lower end of the rotating block (60) is semi-circular, and the mating groove (601) is an open groove that is wider at the top and narrower at the bottom. The bottom shape of the mating groove (601) is adapted to the lower end of the rotating block (60).

3. The braking device (6) of the vehicle according to claim 1, characterized in that: The lower end of the sliding rod (68) abuts against the upper surface of the sliding block (69).

4. The braking device (6) of the vehicle according to claim 1, characterized in that: The wheel fork (63) includes two spaced-apart fork pieces (631). A connecting frame (632) is provided on the upper part of the fork pieces (631) to connect the two. The sliding block (69) is disposed in the connecting frame (632). One end of the first return spring (6a) abuts against the lower side of the sliding block (69), and the other end abuts against the connecting frame (632). The sliding piece (66) is disposed on the fork piece (631) along the length direction of the fork piece (631). One end of the second return spring (6b) abuts against the sliding piece (66), and the other end abuts against the boss (633) on the fork piece (631).

5. A wheel assembly for a vehicle, characterized in that: The vehicle includes a vehicle frame (2), which includes a horizontal tube (21) and fixed seats (22) fixedly disposed at both ends of the horizontal tube (21). Each fixed seat (22) is connected to a braking device (6) of the vehicle as described in any one of claims 1 to 4. The connecting column (62) is inserted into the fixed seat (22). A push rod (3) is slidably disposed in the horizontal tube (21). The push rod (3) is provided with a first inclined surface (31) that can push the sliding rod (68) downward when it slides. The horizontal tube (21) is also provided with a pedal assembly (4) that can drive the push rod (3) to slide when stepped on. The horizontal tube (21) is also provided with a third return spring (5) that can push the push rod (3) to slide back to its original position.

6. The wheel assembly of the vehicle according to claim 5, characterized in that: The pedal assembly (4) includes a housing (41) fixedly connected to the middle of the horizontal tube (21). The housing (41) has a foot block (42) that can slide inside the housing (41) when stepped on. A fourth return spring (43) that can push the foot block (42) to move upward is provided between the foot block (42) and the housing (41). The foot block (42) has a second inclined surface (44) on both sides that can push the push rod (3) to slide when it slides downward.

7. The wheel assembly of the vehicle according to claim 6, characterized in that: The step block (42) is provided with a positioning structure between the step block (42) and the housing (41) to position the step block (42). The positioning structure includes a first locking position (451) on the housing (41) and a second locking position (452) located below the first locking position (451). The step block (42) is provided with a strip hole (454) at its lower end and extending along the length of the horizontal tube (21). The strip hole (454) is provided with a positioning post (453) that can move inside it and alternately stop in the first locking position (451) and the second locking position (452) when the step block (42) is stepped on.

8. The wheel assembly of the vehicle according to claim 7, characterized in that: The housing (41) is provided with an annular groove (45). The first locking position (451) and the second locking position (452) are provided on the side wall of the annular groove (45) and are configured such that: in the initial state, the positioning post (453) is engaged with the first locking position (451). When the foot block (42) is stepped down and released, the positioning post (453) moves along the annular groove (45) and moves to the second locking position (452) under the action of the fourth return spring (43). When the foot block (42) is stepped down and released again, the positioning post (453) continues to move along the annular groove (45) and returns to the first locking position (451) under the action of the fourth return spring (43).

9. The wheel assembly of the vehicle according to claim 8, characterized in that: The annular groove (45) includes a first sliding groove section (45a), a second sliding groove section (45b), a third sliding groove section (45c), a fourth sliding groove section (45d), a fifth sliding groove section (45e), and a sixth sliding groove section (45f) connected in sequence and allowing the positioning post (453) to circulate within it. The first locking position (451) is located at the junction of the first sliding groove section (45a) and the sixth sliding groove section (45f). The housing (41) is provided with a first blocking part (45g) that prevents the positioning post (453) from returning to the second sliding groove section (45b) when the positioning post (453) reaches the bottom of the third sliding groove section (45c) and the fourth return spring (43) pushes the foot block (42) upward. The first blocking part (45g) is provided with a first guide sidewall (45h) that guides the positioning post (453) into the upper end of the fourth sliding groove section (45d). The second locking position (452) is located at the upper end of the fourth slide section (45d). The housing (41) is also provided with a second blocking part (45i) that can prevent the positioning post (453) from returning to the fourth slide section (45d) when the positioning post (453) moves down to the bottom of the fourth slide section (45d) and the step block (42) is pushed up by the fourth return spring (43). The second blocking part (45i) is provided with a second guide sidewall (45j) that can guide the positioning post (453) into the fifth slide section (45e). The fifth slide section (45e), the sixth slide section (45f) and the first slide section (45a) are interconnected so that the positioning post (453) entering the fifth slide section (45e) returns to the first locking position (451) where the first slide section (45a) and the sixth slide section (45f) are connected under the action of the fourth return spring (43).

10. The wheel assembly of the vehicle according to claim 8, characterized in that: The housing (41) includes a front inner shell (411) and a front outer shell (412) fixed to the outside of the front inner shell (411). The housing (41) also includes a rear inner shell (413) and a rear outer shell (414) fixed to the outside of the rear inner shell (413). The front inner shell (411) and the rear inner shell (413) are connected to form a slide (46) in which the step block (42) slides. A side hole (47) communicating with the slide (46) and allowing the push rod (3) to be inserted is provided between the front inner shell (411) and the rear inner shell (413). The front outer shell (412) and the rear outer shell (414) are both provided with the annular groove (45) that cooperates with the positioning post (453).

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