Stroller

Abstract

The utility model discloses a child stroller which comprises a wheel seat, wheels, a wheel shaft, a motor driving assembly, a clutch and a driving piece. The motor driving assembly comprises a motor and a transmission gear set, one transmission pair in the transmission gear set is worm and gear transmission or worm and gear-like transmission, and a last-stage gear of the transmission gear set and the wheel shaft are coaxially installed on the wheel seat and can rotate around the wheel shaft. The clutch is installed between the last-stage gear of the transmission gear set and the wheel shaft, and the clutch is configured to be capable of reciprocating in the axial direction of the wheel shaft and driving the wheel shaft to rotate synchronously. The driving piece is connected with the clutch and can drive the clutch to reciprocate in the axial direction of the axle. By means of the self-locking characteristic of the worm gear and the worm, when the motor does not rotate, the clutch is meshed with the worm gear, and the braking function is achieved through the self-locking characteristic of the worm gear and the worm. When the motor rotates, the clutch is meshed with the worm gear, and the cart enters a power-assisted / automatic running state.

Description

Technical Field

[0001] The utility model relates to a baby stroller. Background Art

[0002] At present, in terms of the power-assisted or automatic driving technology of baby strollers on the market, a design independent of the braking system is often adopted. Although this design can provide basic auxiliary functions, it also brings some disadvantages. First, the existence of two independent systems increases the complexity of the overall design, which not only makes the structure of the stroller more cumbersome but also improves the difficulty of manufacturing and maintenance. Second, the design of the independent system also leads to an increase in cost. The BLDC (brushless DC) motors used in the existing baby strollers have built-in clutches and electromagnetic forces to achieve the self-locking function. The BLDC motor uses electromagnetic force to achieve self-locking, that is, when the motor is not working or the power supply is disconnected, the motor shaft will not be driven to rotate by external force. However, for the BLDC motor to achieve self-locking, a large amount of current needs to be consumed. Moreover, the cost of the BLDC motor is high. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the defects in the prior art and provide a baby stroller.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A baby stroller, comprising:

[0006] A wheel seat;

[0007] Wheels, mounted on the wheel seat;

[0008] Axles, mounted on the wheels and rotating synchronously with the wheels;

[0009] A motor drive assembly, including a motor and a transmission gear set, one of the transmission pairs in the transmission gear set is a worm and worm gear transmission or a similar worm and worm gear transmission, and the last-stage gear of the transmission gear set is coaxially mounted on the wheel seat with the axle and can rotate around the axle;

[0010] A clutch, mounted between the last-stage gear of the transmission gear set and the axle, and the clutch is configured to be able to reciprocate axially along the axle and can drive the axle to rotate synchronously;

[0011] A driving member, connected to the clutch, driving the clutch to reciprocate axially along the axle to achieve the engagement or disengagement of the clutch with the worm or other gears of the transmission gear set.

[0012] Preferably, the clutch is located on the side of the worm or other gears away from the wheels.

[0013] Preferably, it further includes:

[0014] An elastic member, installed inside the wheel seat, with one end of the elastic member abutted against the clutch;

[0015] The elastic member is configured such that: without applying an external force to the elastic member, the clutch moves in the direction close to the worm gear or other gears of the transmission gear set under the pressure of the elastic member, so that the clutch engages with the worm gear or other gears of the transmission gear set;

[0016] Or, the elastic member is configured such that: without applying an external force to the elastic member, the clutch moves in the direction away from the worm gear or other gears of the transmission gear set under the tension of the elastic member, so that the clutch disengages from the worm gear or other gears of the transmission gear set.

[0017] Preferably, the clutch includes:

[0018] An engaging portion, engaging with the worm gear;

[0019] A connecting portion, sleeved on the wheel shaft, and the connecting portion is arranged on the side of the engaging portion away from the worm gear.

[0020] Preferably, a first anti-rotation feature is provided on the wheel shaft, and a second anti-rotation feature that fits the first anti-rotation feature is provided on the connecting portion.

[0021] Preferably, a blocking protrusion is provided at one end of the connecting portion away from the engaging portion;

[0022] A clamping protrusion is provided on the driving member, the driving member is sleeved on the connecting portion, the driving member can move along the axial direction of the connecting portion, and the blocking protrusion is located on the movement path of the clamping protrusion.

[0023] Preferably, it further includes:

[0024] A traction member,

[0025] A driving device, driving the driving member to move through the traction member.

[0026] Preferably, the motor is configured to be capable of forward rotation and reverse rotation.

[0027] Preferably, the clutch is sleeved on the wheel shaft.

[0028] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present invention.

[0029] The positive and progressive effects of the present utility model are as follows: For the baby stroller of the present invention and utility model, the self-locking property of the worm and worm gear can be utilized. When the motor does not rotate, the clutch engages with the worm gear, and the braking function is achieved through the self-locking property of the worm and worm gear. When the motor rotates, the clutch engages with the worm gear, and then the stroller enters the power-assisted / automatic driving state. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the state switching method of the baby stroller according to the preferred embodiment of the present utility model.

[0031] Figure 2 It is a flowchart of the state switching method of the baby stroller according to the preferred embodiment of the present utility model.

[0032] Figure 3 It is a structural diagram of the assembled state of the braking system and the power-assisted system of the baby stroller according to the preferred embodiment of the present utility model.

[0033] Figure 4 It is a structural diagram of the disassembled state of the braking system and the power-assisted system of the baby stroller according to the preferred embodiment of the present utility model.

[0034] Figure 5 It is a sectional view of the assembled state of the braking system and the power-assisted system of the baby stroller according to the preferred embodiment of the present utility model.

[0035] Description of the Reference Numerals:

[0036] Wheel seat 1

[0037] Wheel 2

[0038] Axle 3

[0039] First anti-rotation feature 31

[0040] Motor drive assembly 4

[0041] Worm gear 41

[0042] Motor 42

[0043] Worm 43

[0044] Clutch 5

[0045] Engaging portion 51

[0046] Connecting portion 52

[0047] Second anti-rotation feature 521

[0048] Blocking protrusion 522

[0049] Driver 6

[0050] Snap protrusion 61

[0051] Elastic member 7

[0052] Traction member 8 Specific implementation manner

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0054] It should be noted that in the claims and the specification of this patent, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one" does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0055] As Figure 1 and Figure 2 shown, this embodiment discloses a state switching method for a baby stroller. The baby stroller includes a motor drive assembly, a clutch, a wheel axle, and wheels that rotate synchronously with the wheel axle. Among them, in the transmission of the motor drive assembly, one of the transmission pairs is a worm and worm gear transmission or a worm and worm gear-like transmission to achieve one-way power transmission and reverse self-locking.

[0056] The method includes the following steps:

[0057] Step 1: Adjust the clutch to the open state, and at this time, the stroller is in the manual driving free pushing state.

[0058] Step 2: Adjust the clutch to the closed state. At this time, the stroller is in the state of being driven by the motor drive assembly or restricting the rotation of the wheels. In this state, when the motor starts, the stroller is in the motor assembly driving state. When the motor is turned off, due to the self-locking characteristic of the worm and worm gear structure or the worm and worm gear-like structure in the motor assembly, the stroller is in the braking state.

[0059] By adopting the state switching method of this embodiment, functions such as automatic driving / assisted pushing / automatic braking of the baby stroller can be realized by using a common motor, which greatly reduces the cost.

[0060] As shown Figures 3 - 5 in the figure, this embodiment discloses a baby stroller, which includes a wheel seat 1, wheels 2, axles 3, a motor drive assembly 4, a clutch 5, and a driving member 6.

[0061] The wheels 2 are installed on the wheel seat 1. The axles 3 are installed on the wheels 2 and rotate synchronously with the wheels 2.

[0062] The motor drive assembly 4 provides an electric driving force. It includes a motor 42 and a transmission gear set. One of the transmission pairs in the transmission gear set is a worm gear 41 and worm 43 transmission or a similar worm gear and worm transmission. The last-stage gear of the transmission gear set is coaxially installed on the wheel seat with the axle and can rotate around the axle 3.

[0063] The clutch 5 is installed between the last-stage gear of the transmission gear set and the axle 3. Further, the clutch 5 can be sleeved on the axle 3 so that the clutch can move along the axle 3 without disengaging from the axle 3. The clutch 5 is configured to be able to reciprocate axially along the axle 3 and can drive the axle 3 to rotate synchronously. The driving member 6 is connected to the clutch 5, and the driving member 6 can drive the clutch 5 to reciprocate axially along the axle 3.

[0064] When the driving member 6 drives the clutch 5 to move axially along the axle 3 and approach the worm gear 41 until the clutch 5 engages with the worm gear 41 or other gears of the transmission gear set such as the last-stage gear, at this time, the motor drive assembly 4 can drive the axle 3 through the clutch 5, and then drive the wheels 2 to rotate or stop. When the driving member 6 drives the clutch 5 to move axially along the axle 3 away from the worm gear 41 until the clutch 5 disengages from the worm gear 41, the axle 3 and the wheels 2 can rotate freely relative to the clutch 5. In this state, the baby stroller can be pushed by an external force.

[0065] The baby stroller of this embodiment can utilize the self-locking characteristic of the worm gear. When the motor 42 does not rotate, the clutch 5 engages with the worm gear 41, and the braking function is realized through the self-locking characteristic of the worm gear. When the motor rotates, the clutch engages with the worm gear 41, and then the stroller enters the assisted / powered driving state.

[0066] The baby stroller of this embodiment has a simple structure, low cost, high reliability in clutch 5 driving, and simple mass production and assembly.

[0067] Further, in this embodiment, in order to make the structure of the baby stroller more compact, the clutch 5 of this embodiment is located on the side of the worm gear 41 away from the wheels 2 ( Figure 1 the right side in

[0068] the figure), and in other embodiments, it can also be set on the left side. Figure 1The left end of it abuts against the clutch 5. The elastic member 7 is configured such that, without applying an external force to the elastic member 7, the clutch 5 moves toward the worm wheel 41 under the pressure of the elastic member 7, so that the clutch 5 engages with the worm wheel 41. In this case, the wheel 2 is in a state where it can be driven to rotate or stopped by the motor drive assembly 4. Then, the clutch 5 can be driven by the driving member 6 to move away from the worm wheel 41, and the wheel 2 is switched to a state where it can rotate freely relative to the clutch 5, that is, a state where it can be pushed by an external force.

[0069] In this embodiment, when an external force is applied to the elastic member 7, the elastic member 7 can automatically push the clutch 5 toward the worm wheel 41, realizing the automatic engagement of the clutch 5 and the worm wheel 41, and can automatically reset, which is convenient for the user to operate and improves the user experience.

[0070] In other alternative embodiments, the elastic member 7 can also be configured such that, without applying an external force to the elastic member 7, the clutch 5 moves away from the worm wheel 41 under the pulling force of the elastic member 7, so that the clutch 5 disengages from the worm wheel 41. In this case, the wheel 2 is in a state where it can rotate freely relative to the clutch 5, that is, a state where it can be pushed by an external force. Then, the clutch 5 can be driven by the driving member 6 to move close to the worm wheel 41, and the wheel 2 is switched to a state where it can be driven to rotate or stopped by the motor drive assembly 4.

[0071] In this embodiment, the clutch 5 includes an engaging portion 51 and a connecting portion 52, and the two can be an integral structure or a split structure.

[0072] The engaging portion 51 engages with the worm wheel 41. The connecting portion 52 is a cylindrical structure with a diameter smaller than that of the engaging portion 51, and it is sleeved on the wheel shaft 3. The connecting portion 52 is disposed on the side of the engaging portion 51 away from the worm wheel 41 ( Figure 2 the right side in it).

[0073] In this embodiment, adopting the clutch 5 with the above structural form facilitates the assembly of the clutch 5 with other components.

[0074] In order to simply and reliably achieve the synchronous rotation of the clutch 5 driving the wheel shaft 3, a first anti-rotation feature 31 is provided on the wheel shaft 3 of this embodiment, and a second anti-rotation feature 521 that fits with the first anti-rotation feature 31 is provided on the connecting portion 52. To further improve the anti-rotation effect, the first anti-rotation feature 31 is a pair of symmetrically arranged planes, and the second anti-rotation feature 521 is also a pair of symmetrically arranged planes.

[0075] Furthermore, in this embodiment, a blocking protrusion 522 is provided at one end of the connecting portion 52 away from the engaging portion 51 ( Figure 2 the right end in it), and the diameter of the blocking protrusion 522 is larger than the diameter of the main body part of the cylindrical body of the connecting portion 52.

[0076] The driving member 6 is provided with a clamping protrusion 61, and the driving member 6 is sleeved on the cylindrical main body part of the connecting part 52. The driving member 6 can move axially along the connecting part 52. The blocking protrusion 522 is located on the movement path of the clamping protrusion 61 to limit the driving member 6 from detaching from the connecting part 52, so that the clutch 5 can be pulled by the driving member 6 to move in the axial direction of the axle 3.

[0077] In this embodiment, the elastic member 7 is a spring, but it is not limited thereto. The spring is sleeved outside the driving member 6. Further, in this embodiment, the baby stroller further includes a traction member 8 and a driving device. The driving device drives the driving member 6 to move through the traction member 8, and the driving device can be a mechanical structure drive or an electric drive.

Claims

1. A baby stroller, characterized in that: include: Wheel seat; A wheel, mounted on the wheel seat; A wheel axle, mounted on the wheel and rotating synchronously with the wheel; A motor drive assembly, comprising a motor and a transmission gear set, wherein the transmission pair of one of the transmission gear sets is a worm gear drive or a worm gear-like drive, and the last stage gear of the transmission gear set is coaxially mounted on the wheel seat with the wheel axle and can rotate around the wheel axle; A clutch is installed between the last gear of the transmission gear set and the wheel shaft, and the clutch is configured to be able to reciprocate along the axial direction of the wheel shaft and to drive the wheel shaft to rotate synchronously; The driving member is connected with the clutch and drives the clutch to move back and forth along the axial direction of the wheel shaft to achieve the engagement or disengagement of the clutch with the worm gear or other gears of the transmission gear set.

2. The stroller according to claim 1, characterized in that: The clutch is located on the side of the worm gear or other gear away from the wheel.

3. The stroller according to claim 1, characterized in that: Also includes: An elastic member, installed in the wheel seat, one end of the elastic member abuts against the clutch; The elastic member is configured such that: when no external force is applied to the elastic member, the clutch moves toward the worm wheel or other gear of the transmission gear set under the pressure of the elastic member, so that the clutch is engaged with the worm wheel or other gear of the transmission gear set; Alternatively, the elastic member is configured such that, when no external force is applied to the elastic member, the clutch moves in a direction away from the worm wheel or other gear of the transmission gear set due to the pulling force of the elastic member, so that the clutch is disengaged from the worm wheel or other gear wheel of the transmission gear set.

4. The stroller according to claim 1, characterized in that: The clutch comprises: An engaging portion engaged with the worm gear; The connecting portion is sleeved on the wheel shaft, and the connecting portion is arranged on a side of the engaging portion away from the worm gear.

5. The stroller according to claim 4, characterized in that: The wheel axle is provided with a first anti-rotation feature, and the connecting portion is provided with a second anti-rotation feature that fits with the first anti-rotation feature.

6. The stroller according to claim 4, characterized in that: A blocking protrusion is provided at one end of the connecting portion away from the engaging portion; The driving member is provided with a clamping protrusion, the driving member is sleeved on the connecting portion, the driving member can move along the axial direction of the connecting portion, and the blocking protrusion is located on the moving path of the clamping protrusion.

7. The stroller according to claim 1, characterized in that: Also includes: Traction parts, The driving device drives the driving member to move through the traction member.

8. The stroller according to claim 1, characterized in that: The motor is configured to be able to rotate in forward and reverse directions.

9. The stroller according to claim 1, characterized in that: The clutch is sleeved on the wheel shaft.

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