Single-pedal double-brake rear wheel set of baby carriage

Abstract

The utility model relates to the field of baby carriages, in particular to a single-pedal double-brake rear wheel set of a baby carriage. Comprising a right rear wheel assembly and a left rear wheel assembly which are oppositely arranged, the right rear wheel assembly comprises a right axle, a right rear wheel and a right rear wheel locking mechanism, the right rear wheel is rotatably installed on the right axle, the right rear wheel locking mechanism is installed between the right axle and the right rear wheel, and the right rear wheel locking mechanism is used for locking the right rear wheel on the right axle. The left rear wheel assembly comprises a left wheel axle, a left rear wheel and a left rear wheel locking mechanism, the left rear wheel is rotatably installed on the left wheel axle, the left rear wheel locking mechanism is installed between the left wheel axle and the left rear wheel, the left rear wheel locking mechanism is used for locking the left rear wheel on the left wheel axle, and the left rear wheel locking mechanism is in transmission connection with the right rear wheel locking mechanism through a pull rope. The utility model provides the single-pedal double-brake rear wheel set of the baby carriage, and the single-pedal double-brake rear wheel set of the baby carriage has the following technical effects that the operation of folding and unfolding a carriage frame is simple, and the practicability is strong.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of baby carriage, especially a baby carriage single-step double-brake rear wheel set. BACKGROUND

[0002] Baby carriage is a kind of tool car designed for the convenience of outdoor activities of infants and young children, which has been widely used, in order to make baby carriage more convenient to carry and store, the baby carriage is designed into foldable structure at present, in this way, baby carriage can be folded to be small volume when not in use to facilitate carrying and storage.

[0003] Baby carriage needs brake to make the vehicle unable to move in the use process, most baby carriages adopt rear wheel brake, but most are single-wheel single-brake, and the user needs to step on the brake twice to make two rear wheels be braked, which is relatively cumbersome, so a single-step double-brake rear wheel locking mechanism is needed to make the brake work more simple and easy to operate. SUMMARY

[0004] Therefore, it is necessary to provide a baby carriage single-step double-brake rear wheel set to solve the problem that most are single-wheel single-brake in the prior art, the user needs to step on the brake twice to make two rear wheels be braked, which is relatively cumbersome, to achieve the purpose that the brake work is more simple and easy to operate.

[0005] Therefore, the application provides a baby carriage single-step double-brake rear wheel set, which comprises a right rear wheel assembly 100 and a left rear wheel assembly 200 arranged oppositely, the right rear wheel assembly 100 and the left rear wheel assembly 200 are detachably installed on the corresponding rear legs 300 of the baby carriage through connecting pieces 310, the right rear wheel assembly 100 comprises a right wheel shaft 110, a right rear wheel 120 and a right rear wheel locking mechanism 130, the right rear wheel 120 is rotatably installed on the right wheel shaft 110, the right rear wheel locking mechanism 130 is installed between the right wheel shaft 110 and the right rear wheel 120, and the right rear wheel locking mechanism 130 is used for locking the right rear wheel 120 on the right wheel shaft 110, the left rear wheel assembly 200 comprises a left wheel shaft 210, a left rear wheel 220 and a left rear wheel locking mechanism 230, the left rear wheel 220 is rotatably installed on the left wheel shaft 210, the left rear wheel locking mechanism 230 is installed between the left wheel shaft 210 and the left rear wheel 220, and the left rear wheel locking mechanism 230 is used for locking the left rear wheel 220 on the left wheel shaft 210, the left rear wheel locking mechanism 230 is drivingly connected with the right rear wheel locking mechanism 130 through a pull rope 400, when the right rear wheel locking mechanism 130 is locked with the right rear wheel 120 under the driving of external force, the left rear wheel locking mechanism 230 is locked with the left rear wheel 220 under the driving of the right rear wheel locking mechanism 130.

[0006] The right rear wheel locking mechanism 130 comprises a right lock core seat 131, a right lock core 132, a right lock core drive rotary cap 133, a right lock catch 134 and a right reset spring 135. The right lock core seat 131 is fixedly installed on the right wheel shaft 110. The right lock core drive rotary cap 133 is rotatably installed on the right lock core seat 131. The right lock catch 134 is fixedly installed on the right rear wheel 120. One end of the connecting piece 310 is connected with the right lock core seat 131, and the other end is detachably connected with the baby carriage rear leg 300.

[0007] The side of the right lock core seat 131 away from the right rear wheel 120 is provided with a convex shaft 1311. The right lock core drive rotary cap 133 is provided with a groove 1331 matched with the convex shaft 1311. The convex shaft 1311 is rotatably installed in the groove 1331.

[0008] The right lock core 132 comprises a right lock core shell 1322 with a hollow structure and a right lock core column 1321 inserted in the right lock core shell 1322. The right lock core seat 131 is provided with a right sliding hole 1312 matched with the right lock core shell 1322 for the right lock core shell 1322 to slide through and a right limiting hole 1313 matched with the right lock core column 1321 for the right lock core column 1321 to slide through. The right lock core shell 1322 is slidably installed in the right sliding hole 1312. The right lock core column 1321 is slidably installed in the right limiting hole 1313. The hole wall of the right limiting hole 1313 is used to limit the right lock core shell 1322 from entering the right limiting hole 1313. The right reset spring 135 is installed between the right limiting hole 1313 and the hole wall of the right limiting hole 1313 on the side of the right lock core shell 1322 close to the right limiting hole 1313.

[0009] The right lock core shell 1322 is in transmission connection with the right lock core drive rotary cap 133. The inner wall of the right lock core drive rotary cap 133 is provided with a slope surface 1332. The end of the right lock core shell 1322 towards the right lock core drive rotary cap 133 abuts on the slope surface 1332 and is in sliding connection with the slope surface 1332.

[0010] The slope surface 1332 is provided with a slope bottom locking groove 1333 and a slope top locking groove 1334 for clamping the right lock core shell 1322.

[0011] The end of the right lock core shell 1322 towards the right lock core drive rotary cap 133 is provided with a spherical surface structure. The slope bottom locking groove 1333 and the slope top locking groove 1334 are both provided with a hemispherical groove.

[0012] The right lock catch 134 is an annular lock catch. The right lock catch 134 is rotatably sleeved on the right wheel shaft 110. The right lock catch 134 is provided with a plurality of insertion holes 1341 matched with the right lock core 132 around the right wheel shaft 110 in the circumferential direction. The right lock core 132 can be inserted into the insertion holes 1341 under the drive of the right lock core drive rotary cap 133.

[0013] The left rear wheel locking mechanism 230 and the right rear wheel locking mechanism 130 are locking mechanisms with the same structure, and the left rear wheel locking mechanism 230 comprises a left lock cylinder seat, a left lock cylinder, a left lock catch, a left lock cylinder driving cap and a left reset spring.

[0014] The left lock cylinder driving cap is connected with the right lock cylinder driving cap 133 through a pull rope 400, and the left lock cylinder driving cap can rotate with the right lock cylinder driving cap 133 through the transmission of the pull rope 400.

[0015] A connecting pipe 500 for the pull rope 400 to pass through is further arranged between the left lock cylinder seat and the right lock cylinder seat 131, the left lock cylinder seat is provided with a left lock cylinder seat pull rope channel penetrating the connecting pipe 500, the right lock cylinder seat 131 is provided with a right lock cylinder seat pull rope channel 1314 penetrating the connecting pipe 500, the pull rope 400 is arranged in the connecting pipe 500, one end of the pull rope 400 is fixedly connected with the right lock cylinder driving cap 133 through the right lock cylinder seat pull rope channel 1314, and the other end is fixedly connected with the left lock cylinder driving cap through the left lock cylinder seat pull rope channel.

[0016] The right lock cylinder driving cap 133 is provided with a foot pedal 1335.

[0017] The utility model provides a kind of baby carriage single step double brake rear wheel group, with the following technical effects: the utility model provides a kind of baby carriage single step double brake rear wheel group, and folding carriage frame is easy to operate, and practicality is strong. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0019] Figure 1 is the use state schematic diagram of the utility model.

[0020] Figure 2 is the overall structure schematic diagram of the utility model.

[0021] Figure 3 is the right rear wheel assembly structure schematic diagram of the utility model.

[0022] Figure 4 is the right rear wheel locking mechanism structure schematic diagram of the utility model.

[0023] Figure 5 is the right rear wheel locking mechanism working principle schematic diagram of the utility model.

[0024] Figure 6 is a right lock cylinder driving cap structure schematic diagram of the utility model.

[0025] Figure 7 is a right lock cylinder seat and right wheel shaft position structure schematic diagram of the utility model.

[0026] Figure 8 is a right sliding hole and right limiting hole structure schematic diagram of the utility model.

[0027] Figure 9 is a right lock cylinder seat and right lock cylinder position structure schematic diagram of the utility model.

[0028] Figure 10 is Figure 9 along A-A section view.

[0029] Figure 11 is a right lock cylinder seat pull rope channel and pull rope schematic diagram of the utility model.

[0030] Figure 12 is a right lock cylinder and right lock cylinder driving cap position structure schematic diagram of the utility model.

[0031] Figure 13 is a right lock cylinder, right lock cylinder driving cap and right lock catch position schematic diagram of the utility model.

[0032] Mark explanation: right rear wheel assembly 100, left rear wheel assembly 200, rear leg 300, connecting piece 310, right wheel shaft 110, right rear wheel 120, right rear wheel locking mechanism 130, left wheel shaft 210, left rear wheel 220, left rear wheel locking mechanism 230, pull rope 400, right lock cylinder seat 131, right lock cylinder 132, right lock cylinder driving cap 133, right lock catch 134, right reset spring 135, convex shaft 1311, recess 1331, right lock cylinder shell 1322, right lock cylinder column 1321, right sliding hole 1312, right limiting hole 1313, inclined surface 1332, slope bottom locking groove 1333, slope top locking groove 1334, insertion hole 1341, connecting pipe 500, right lock cylinder seat pull rope channel 1314, footboard 1335. DETAILED DESCRIPTION

[0033] In order to make the above object, features and advantages of the utility model more apparent, easy to understand, below, specific implementation of the utility model is explained in detail with the figures. In the following description, a lot of specific details are set forth in order to fully understand the utility model. But the utility model can be implemented in many other ways different from the description, and those skilled in the art can make similar improvements without violating the connotation of the utility model, therefore the utility model is not limited by the following disclosed specific embodiments.

[0034] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "right", "left", "vertical", "liquid level", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0035] In addition, the terms "right" and "left" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "right" and "left" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0036] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] In the utility model, unless otherwise specifically defined and limited, the right feature "on" or "under" the left feature can be direct contact between the right and left features, or indirect contact between the right and left features through an intermediate medium. Moreover, the right feature "above", "above" and "above" the left feature can be the right feature directly above or obliquely above the left feature, or only indicate that the liquid level height of the right feature is higher than that of the left feature. The right feature "below", "below" and "below" the left feature can be the first feature directly below or obliquely below the left feature, or only indicate that the liquid level height of the right feature is less than that of the left feature.

[0038] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, when a part is referred to as being "on" or "connected to" another part, it can be directly on or connected to the other part or intervening parts can be present. As used herein, the term "vertical", "horizontal", "upper", "lower", "right", "left", and similar terms are used for explanation only and not to indicate a unique position or orientation.

[0039] The utility model embodiment provides a kind of single step double brake rear wheel group of perambulator, the technical scheme of the utility model embodiment in the following will be combined with the drawings in the utility model embodiment, it is clear, complete to describe, obviously, the described embodiment is only part of the utility model embodiment, not all embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the scope of the utility model protection.

[0040] Please refer to Figure 1 The application provides a kind of single step double brake rear wheel group of perambulator, including the right rear wheel assembly 100 and left rear wheel assembly 200 of opposite setting, right rear wheel assembly 100 and left rear wheel assembly 200 are respectively detachable installation on the corresponding rear leg 300 of perambulator by connecting piece 310, specifically, the bottom of connecting piece 310 is fixedly connected with corresponding right rear wheel assembly 100 or left rear wheel assembly 200 by bolt, the top end of connecting piece 310 is spliced with rear leg 300 or is connected by bolt.

[0041] As Figure 2 And Figure 3 It is shown that right rear wheel assembly 100 includes right wheel shaft 110, right rear wheel 120 and right rear wheel locking mechanism 130, the right rear wheel 120 is rotatably installed on right wheel shaft 110, right rear wheel locking mechanism 130 is installed between right wheel shaft 110 and right rear wheel 120, right rear wheel locking mechanism 130 is used to lock right rear wheel 120 on right wheel shaft 110, as Figure 2 It is shown that left rear wheel assembly 200 includes left wheel shaft 210, left rear wheel 220 and left rear wheel locking mechanism 230, the left rear wheel 220 is rotatably installed on left wheel shaft 210, left rear wheel locking mechanism 230 is installed between left wheel shaft 210 and left rear wheel 220, left rear wheel locking mechanism 230 is used to lock left rear wheel 220 on left wheel shaft 210, the left rear wheel locking mechanism 230 is drivenly connected with right rear wheel locking mechanism 130 by pull rope 400, when right rear wheel locking mechanism 130 is locked right rear wheel 120 under the drive of external force, left rear wheel locking mechanism 230 is locked left rear wheel 220 under the drive of right rear wheel locking mechanism 130.

[0042] Please refer toFigures 4 to 6 The right rear wheel locking mechanism 130 comprises a right lock cylinder seat 131, a right lock cylinder 132, a right lock cylinder drive cap 133, a right lock catch 134 and a right reset spring 135, as shown in Figure 4 The right lock cylinder seat 131 is fixedly installed on the right wheel shaft 110, the right lock cylinder drive cap 133 is rotatably installed on the right lock cylinder seat 131, the right lock catch 134 is fixedly installed on the right rear wheel 120, and one end of the connecting piece 310 is connected with the right lock cylinder seat 131 and the other end is detachably connected with the baby carriage rear leg 300. Specifically, the connecting piece 310 can be connected by a sleeve buckle or by a bolt.

[0043] As shown in Figure 5 , the side of the right lock cylinder seat 131 facing away from the right rear wheel 120 is provided with a protruding shaft 1311, as shown in Figure 6 , the right lock cylinder drive cap 133 is provided with a groove 1331 matching the protruding shaft 1311, and the protruding shaft 1311 is rotatably installed in the groove 1331.

[0044] Referring to Figures 5 to 10 , the right lock cylinder 132 comprises a right lock cylinder shell 1322 with a hollow structure and a right lock cylinder column 1321 inserted into the right lock cylinder shell 1322, as shown in Figure 5 and Figure 8 , the right lock cylinder seat 131 is provided with a right sliding hole 1312 matching the right lock cylinder shell 1322 for the right lock cylinder shell 1322 to slide through and a right limiting hole 1313 matching the right lock cylinder column 1321 for the right lock cylinder column 1321 to slide through, the right lock cylinder shell 1322 is slidably installed in the right sliding hole 1312, and the right lock cylinder column 1321 is slidably installed in the right limiting hole 1313, as shown in Figure 10 , the hole wall of the right limiting hole 1313 on the side is used to limit the right lock cylinder shell 1322 from entering the right limiting hole 1313, and the right reset spring 135 is installed between the end of the right lock cylinder shell 1322 close to the right limiting hole 1313 and the hole wall on the side of the right limiting hole 1313, when the right lock cylinder shell 1322 slides towards the right limiting hole 1313, the right lock cylinder shell 1322 compresses the right reset spring 135 and pushes the right lock cylinder column 1321 to insert into the lock catch.

[0045] Referring to Figure 12 and Figure 13 , the right lock cylinder shell 1322 is in transmission connection with the right lock cylinder drive cap 133, the inner wall of the right lock cylinder drive cap 133 is provided with a slope surface 1332, the end of the right lock cylinder shell 1322 facing the right lock cylinder drive cap 133 abuts against the slope surface 1332 and is in sliding connection with the slope surface 1332, and the right lock cylinder drive cap 133 pushes the right lock cylinder 132 to slide in the lock cylinder sliding hole 1312 by rotating.

[0046] In order to fix the right lock core driving cap 133 and the right lock core shell 1322 when reaching the required position, the slope bottom locking groove 1333 and the slope top locking groove 1334 for clamping the right lock core shell 1322 are arranged on the slope surface 1332, as shown in Figure 6 and Figure 9 The slope bottom locking groove 1333 is located at the slope bottom of the slope surface 1332, and the slope top locking groove 1334 is located at the slope top of the slope surface 1332. When the right lock core driving cap 133 rotates to make the slope bottom locking groove 1333 reach the right lock core shell 1322, the right lock core shell 1322 is subjected to the action of the right reset spring 135, so that the corresponding end of the right lock core shell 1322 is clamped into the slope bottom locking groove 1333. Similarly, when the right lock core driving cap 133 rotates to make the slope top locking groove 1334 reach the right lock core shell 1322, the right lock core shell 1322 is subjected to the action of the right reset spring 135, so that the corresponding end of the right lock core shell 1322 is clamped into the slope top locking groove 1334.

[0047] When it is necessary to change the locking state of the right rear wheel 120, the right lock core driving cap 133 is driven to rotate under the action of an external force, so that the right lock core shell 1322 slides out of the slope bottom locking groove 1333 or the slope top locking groove 1334. In order to make the right lock core shell 1322 more easily slide out of the slope bottom locking groove 1333 or the slope top locking groove 1334, the end of the right lock core shell 1322 towards the right lock core driving cap 133 is arranged in a spherical surface structure, and the slope bottom locking groove 1333 and the slope top locking groove 1334 are both arranged in a semispherical groove, so as to achieve the purpose that the right lock core shell 1322 can slide out of the slope bottom locking groove 1333 or the slope top locking groove 1334 by easily rotating the right lock core driving cap 133.

[0048] Referring to Figure 13 The right lock catch 134 is an annular lock catch, which is rotatably sleeved on the right wheel shaft 110. A plurality of insertion holes 1341 matched with the right lock core 132 are arranged on the right lock catch 134 around the right wheel shaft 110 in the circumferential direction. The right lock core 132 can be inserted into the insertion hole 1341 under the driving of the right lock core driving cap 133, so that the right rear wheel 120 cannot rotate on the right wheel shaft 110, thereby achieving the purpose of locking the right rear wheel 120.

[0049] In the initial state, the wheel is in the unlocked state, the right reset spring 135 limits the right lock cylinder 132 to insert the right lock 134, the end of the right lock cylinder shell 1322 towards the right lock cylinder drive cap 133 is clamped in the slope bottom locking groove 1333, when the right lock cylinder drive cap 133 is rotated by external force, the end of the right lock cylinder shell 1322 towards the right lock cylinder drive cap 133 slides out of the slope top locking groove 1334 and slides on the slope surface 1332, with the change of the slope of the slope surface 1332, the right lock cylinder 132 is pushed by the slope surface 1332 to slide horizontally in the lock cylinder sliding hole 1312 and finally inserts into the insertion hole 1341 of the right lock 134, at the same time, the right reset spring 36 is compressed, when the right lock cylinder drive cap 133 is rotated to the slope top locking groove 1334 to clamp the end towards the right lock cylinder drive cap 133, the external force on the right lock cylinder drive cap 133 is removed, the wheel is in the locked state; when the wheel needs to be unlocked, the right lock cylinder drive cap 133 is rotated in the opposite direction of the above operation by external force, the end of the right lock cylinder shell 1322 towards the right lock cylinder drive cap 133 slides out of the slope top locking groove 1334 and slides on the slope surface 1332, with the change of the slope of the slope surface 1332, the right lock cylinder 132 is separated from the insertion hole 1341 of the right lock 134 under the action of the restoring force of the right reset spring 36, when the right lock cylinder drive cap 133 is rotated to the slope bottom locking groove 1333 to clamp the end towards the right lock cylinder drive cap 133, the external force on the right lock cylinder drive cap 133 is removed, the wheel is in the unlocked state.

[0050] The left rear wheel locking mechanism 230 and the right rear wheel locking mechanism 130 are locking mechanisms with the same structure, the left rear wheel locking mechanism 230 includes a left lock cylinder seat, a left lock cylinder, a left lock, a left lock cylinder drive cap and a left reset spring, and the structure of the left rear wheel locking mechanism 230 will not be described one by one.

[0051] The left lock cylinder drive cap and the right lock cylinder drive cap 133 are connected by a pull rope 400, when the right lock cylinder drive cap 133 is rotated under the drive of external force, the left lock cylinder drive cap can be rotated with the right lock cylinder drive cap 133 through the transmission of the pull rope 400, the left lock cylinder drive cap drives the left lock cylinder to lock the left lock, a connecting pipe 500 for the pull rope 400 to pass through is further arranged between the left lock cylinder seat and the right lock cylinder seat 131, the left lock cylinder seat is provided with a left lock cylinder seat pull rope passage penetrating the connecting pipe 500, the right lock cylinder seat 131 is provided with a right lock cylinder seat pull rope passage 1314 penetrating the connecting pipe 500, the pull rope 400 is arranged in the connecting pipe 500, one end of the pull rope 400 is fixedly connected with the right lock cylinder drive cap 133 through the right lock cylinder seat pull rope passage 1314, and the other end is fixedly connected with the left lock cylinder drive cap through the left lock cylinder seat pull rope passage.

[0052] As Figure 4As shown, the right lock cylinder drive rotary cover 133 is provided with a foot pedal 1335, in use, the user steps on the foot pedal 1335 to make the right lock cylinder drive rotary cover 133 rotate, the right lock cylinder drive rotary cover 133 drives the right lock cylinder 132 to insert into the right lock catch 134, and the corresponding end of the pull rope 400 is pulled to move downward, then the pull rope 400 pulls the left lock cylinder drive rotary cover to rotate through the other end of the pull rope 400, the left lock cylinder drive rotary cover drives the left lock cylinder to insert into the left lock catch, and the purpose of single stepping double braking is achieved.

[0053] The utility model provides a kind of baby carriage single-pedal double-brake rear wheel group, with the following technical effects: a kind of baby carriage single-pedal double-brake rear wheel group in the utility model, folding carriage frame is easy to operate, and practicality is strong.

[0054] The above is only used to illustrate the technical scheme of the utility model, and is not limited, other modifications or equivalent replacements of the technical scheme of the utility model made by the ordinary skill in the art should be covered in the claim range of the utility model, as long as not departing from the spirit and scope of the technical scheme of the utility model.

Claims

1. A single-step double-brake rear wheel set for a baby carriage, characterized by: The application relates to a baby carriage, which comprises oppositely arranged right rear wheel assemblies (100) and left rear wheel assemblies (200), the right rear wheel assemblies (100) and the left rear wheel assemblies (200) are detachably installed on corresponding rear legs (300) of the baby carriage through connecting members (310), the right rear wheel assembly (100) comprises a right wheel shaft (110), a right rear wheel (120) and a right rear wheel locking mechanism (130), the right rear wheel (120) is rotatably installed on the right wheel shaft (110), the right rear wheel locking mechanism (130) is installed between the right wheel shaft (110) and the right rear wheel (120), and the right rear wheel locking mechanism (130) is used for locking the right rear wheel (120) on the right wheel shaft (110), the left rear wheel assembly (200) comprises a left wheel shaft (210), a left rear wheel (220) and a left rear wheel locking mechanism (230), the left rear wheel (220) is rotatably installed on the left wheel shaft (210), the left rear wheel locking mechanism (230) is installed between the left wheel shaft (210) and the left rear wheel (220), and the left rear wheel locking mechanism (230) is used for locking the left rear wheel (220) on the left wheel shaft (210), the left rear wheel locking mechanism (230) is drivingly connected with the right rear wheel locking mechanism (130) through a pull rope (400), when the right rear wheel locking mechanism (130) is locked to the right rear wheel (120) under the drive of external force, the left rear wheel locking mechanism (230) is locked to the left rear wheel (220) under the drive of the right rear wheel locking mechanism (130), the right rear wheel locking mechanism (130) comprises a right lock core seat (131), a right lock core (132), a right lock core driving rotary cover (133), a right lock catch (134) and a right reset spring (135), the right lock core seat (131) is fixedly installed on the right wheel shaft (110), the right lock core driving rotary cover (133) is rotatably installed on the right lock core seat (131), the right lock catch (134) is fixedly installed on the right rear wheel (120), one end of the connecting member (310) is connected with the right lock core seat (131), and the other end is detachably connected with the rear leg (300) of the baby carriage.

2. The single-step double-brake rear wheel set of claim 1, wherein: The side, away from the right rear wheel (120), of the right lock core seat (131) is provided with a convex shaft (1311), the right lock core driving rotary cover (133) is provided with a groove (1331) matched with the convex shaft (1311), and the convex shaft (1311) is rotatably installed in the groove (1331).

3. The single-step double-brake rear wheel set of claim 2, wherein: The right lock cylinder (132) comprises a hollow right lock cylinder shell (1322) and a right lock cylinder column (1321) inserted in the right lock cylinder shell (1322), the right lock cylinder seat (131) is provided with a right sliding hole (1312) matched with the right lock cylinder shell (1322) for sliding of the right lock cylinder shell (1322) and a right limiting hole (1313) matched with the right lock cylinder column (1321) for sliding of the right lock cylinder column (1321), the right lock cylinder shell (1322) is slidably installed in the right sliding hole (1312), the right lock cylinder column (1321) is slidably installed in the right limiting hole (1313), and the hole wall of the right limiting hole (1313) is used for limiting the right lock cylinder shell (1322) from entering the right limiting hole (1313), and the right reset spring (135) is installed between the right lock cylinder shell (1322) and the hole wall of the right limiting hole (1313) near the right limiting hole (1313).

4. The single-step double-brake rear wheel set of claim 3, wherein: The right lock cylinder shell (1322) is in transmission connection with the right lock cylinder driving cap (133), and an inclined surface (1332) is arranged on the inner wall of the right lock cylinder driving cap (133), one end of the right lock cylinder shell (1322) towards the right lock cylinder driving cap (133) abuts on the inclined surface (1332) and is in sliding connection with the inclined surface (1332).

5. The single-step double-brake rear wheel set of claim 4, wherein: The inclined surface (1332) is provided with a slope bottom locking groove (1333) and a slope top locking groove (1334) for clamping the right lock cylinder shell (1322).

6. The single-step double-brake rear wheel set of claim 1, wherein: The right lock catch (134) is an annular lock catch, the right lock catch (134) is rotatably sleeved on the right wheel shaft (110), and a plurality of insertion holes (1341) matched with the right lock cylinder (132) are arranged on the right lock catch (134) in the circumferential direction of the right wheel shaft (110), and the right lock cylinder (132) can be inserted into the insertion hole (1341) under the driving of the right lock cylinder driving cap (133).

7. The single-step double-brake rear wheel set of claim 1, wherein: The left rear wheel locking mechanism (230) and the right rear wheel locking mechanism (130) are locking mechanisms with the same structure, and the left rear wheel locking mechanism (230) comprises a left lock cylinder seat, a left lock cylinder, a left lock catch, a left lock cylinder driving cap and a left reset spring.

8. A single-step double-brake rear wheel set of a baby carriage according to claim 7, characterized in that: The left lock cylinder driving cap is connected with the right lock cylinder driving cap (133) through a pull rope (400), the left lock cylinder driving cap can rotate with the right lock cylinder driving cap (133) through the transmission of the pull rope (400), a connecting pipe (500) for the pull rope (400) to pass through is further arranged between the left lock cylinder seat and the right lock cylinder seat (131), the left lock cylinder seat is provided with a left lock cylinder seat pull rope channel penetrating the connecting pipe (500), the right lock cylinder seat (131) is provided with a right lock cylinder seat pull rope channel (1314) penetrating the connecting pipe (500), the pull rope (400) is inserted in the connecting pipe (500), one end of the pull rope (400) penetrates the right lock cylinder seat pull rope channel (1314) and is fixedly connected with the right lock cylinder driving cap (133), and the other end penetrates the left lock cylinder seat pull rope channel and is fixedly connected with the left lock cylinder driving cap.

9. The single-step double-brake rear wheel set of claim 1, wherein: The right lock cylinder driving cap (133) is provided with a foot pedal (1335).

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