Rear wheel stretching structure of luggage barrow

Abstract

The utility model belongs to the technical field of luggage barrow structures, and particularly relates to a rear wheel stretching structure of a luggage barrow, which comprises a barrow body, a luggage case arranged on the barrow body, a handle arranged in front of the barrow body, and a front wheel and a rear wheel arranged below the barrow body. The two rear wheels are arranged on the left side and the right side, and the two rear wheels are connected through a driving assembly. The driving assembly comprises an electric push rod and a connecting rod assembly, the connecting rod assembly comprises a fixed seat and a rear wheel mounting seat, the rear wheel is rotatably arranged on the rear wheel mounting seat, and the fixed seat and the rear wheel mounting seat are connected through at least two parallel driving connecting rods; the electric push rod is fixed on the vehicle body, a telescopic rod of the electric push rod acts on the driving connecting rod or the rear wheel mounting seat, and the electric push rod provides driving force for outward or inward movement of the rear wheel; under the action of the two parallel driving connecting rods, the rear wheel keeps the advancing direction all the time in the process that the rear wheel moves outwards or inwards. The rear wheel stretching structure of the luggage barrow is stable in structure.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the rear wheel extension structure technical field of trolley, especially point to a rear wheel extension structure of trolley. BACKGROUND

[0002] With the progress of science and technology, people in daily life, travel more and more outdoor sports, in order to travel conveniently, everyone carries a suitcase, but if too many things are carried in the suitcase, it is difficult to carry, in addition, the traditional suitcase does not consider the placing problem in the transportation process and the problem of convenient walking, especially the problem of walking several kilometers from the parking lot to the station waiting room or the airport waiting room and the problem of no seat when taking a long-distance bus, therefore, the market begins to appear the electric suitcase that can be ridden.

[0003] Such as Chinese patent CN201820515402.9, an electric suitcase, including box, battery, sleeve fixed in the box, telescopic rod installed in the sleeve and can slide relative to the sleeve and protrude out of the box, two rear wheels arranged at the bottom of the box, the front end of the telescopic rod is connected with the front handle bar and the front wheel, the box has a top for riding. The product solves the problem of riding, which is convenient for users and has a small use volume, but the product also has certain deficiencies: in order to save the space of the vehicle, the two rear wheels of the vehicle are close to the box, which is easy to cause the problem of rollover in the state of turning, the main reason is that the two rear wheels are too close, but if the two rear wheels are far apart, the overall volume will increase, so it is a contradiction. SUMMARY

[0004] The utility model aims at providing a rear wheel extension structure of trolley with stable structure.

[0005] The utility model is implemented as follows:

[0006] A rear wheel extension structure of trolley, including vehicle body, the vehicle body is provided with a suitcase, the vehicle body is provided with a handle in front, the lower portion of the vehicle body is provided with a front wheel and a rear wheel, the rear wheel is arranged on the left and right sides, and the two rear wheels are connected through a driving assembly, the driving assembly controls the two rear wheels to move away from or close to the vehicle body synchronously,

[0007] The driving assembly includes an electric push rod and a connecting rod assembly, the connecting rod assembly includes a fixed seat and a rear wheel mounting seat, the rear wheel is rotatably arranged on the rear wheel mounting seat, and the fixed seat and the rear wheel mounting seat are connected through at least two driving connecting rods arranged in parallel, the electric push rod is fixed on the vehicle body, the telescopic rod of the electric push rod acts on the driving connecting rod or the rear wheel mounting seat, and the electric push rod provides a driving force for the rear wheel to move outward or inward, under the action of the two parallel driving connecting rods, the rear wheel keeps moving forward at all times in the process of moving outward or inward.

[0008] Further, the transmission connecting rod is rotatably arranged at one end of the telescopic rod of the electric push rod and rotatably arranged at the other end of the driving connecting rod or the rear wheel mounting seat; the transmission connecting rod is symmetrically arranged at both sides of the telescopic rod of the electric push rod, and the telescopic rod of the electric push rod moves, and the two rear wheels move synchronously under the connection of the transmission connecting rod.

[0009] Further, the end of the telescopic rod of the electric push rod is fixedly arranged with a hinged seat, one end of the transmission connecting rod is rotatably connected to the hinged seat, and the other end of the transmission connecting rod is hingedly connected to the middle part of the driving connecting rod.

[0010] Further, the hinged seat is in the shape of an I-beam, and the transmission connecting rod is hingedly arranged in the cavity of the hinged seat.

[0011] Further, a guide rod is arranged between the hinged seat and the fixed seat, and the hinged seat moves along the guide rod.

[0012] Further, the guide rod is fixedly arranged on the fixed seat, and the end of the guide rod is provided with a stepped portion; when the hinged seat abuts against the stepped portion, the hinged seat moves to the limit position.

[0013] Further, the driving connecting rods are arranged in pairs, and the driving connecting rods in the same pair are symmetrically arranged at both sides of the fixed seat and the rear wheel mounting seat.

[0014] Further, one pair of the driving connecting rods is symmetrically provided with connecting rod hinged holes, the transmission connecting rod is located between the two connecting rod hinged holes, and the rotating shaft passes through the connecting rod hinged holes and the transmission connecting rod and rotatably connects the three.

[0015] Further, the bottom of the vehicle body is provided with a recessed portion, and the electric push rod is hidden and arranged in the recessed portion.

[0016] Further, the two sides of the vehicle body base are provided with convex edges, and the recessed portion is formed between the two convex edges.

[0017] The utility model has the following prominent and beneficial technical effects compared with the prior art:

[0018] 1、The utility model discloses a rear wheel telescopic structure, which can be expanded by electric pushing in the riding state, increase the distance between the two rear wheels, and improve the stability of driving. Of course, the two rear wheels can also be normally ridden without expansion. Moreover, at least two parallel driving connecting rods are arranged, so that the two rear wheels remain in the forward state during the expansion and contraction process, effectively ensuring the stability of riding. As an optimization, the driving connecting rods are arranged in pairs, and the two driving connecting rods arranged in upper and lower layers form a pair. The driving connecting rods have large load bearing, so that the driving connecting rods arranged in upper and lower layers can be structurally reinforced to ensure the stability of the structure.

[0019] 2, the telescopic rod of the electric push rod is connected with the drive connecting rod or the rear wheel mounting seat through the symmetrically arranged transmission connecting rods, so that one electric push rod can simultaneously control two rear wheels to move outward or inward synchronously.

[0020] 3, the hinge seat and the fixed seat are provided with a guide rod, the hinge seat moves along the guide rod, so that the movement of the hinge seat is constrained, the hinge seat can only move linearly along the guide rod, the movement of the hinge seat is more stable, and lateral swing does not occur, so that the two transmission connecting rods can keep effective synchronization effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of a rear wheel contraction state of the utility model;

[0022] Figure 2 is a structural schematic view of a rear wheel contraction state of the utility model;

[0023] Figure 3 is Figure 2 the enlarged structural schematic view of A of the utility model;

[0024] Figure 4 is a partial structural schematic view of a rear wheel contraction state of the utility model;

[0025] Figure 5 is a partial structural schematic view of a rear wheel contraction state of the utility model;

[0026] Figure 6 is a structural schematic view of a rear wheel expansion state of the utility model;

[0027] Figure 7 is a structural schematic view of a rear wheel expansion state of the utility model;

[0028] Figure 8 is a partial structural schematic view of a rear wheel expansion state of the utility model;

[0029] Figure 9 is a partial structural schematic view of a rear wheel expansion state of the utility model;

[0030] Figure 10 is a partial exploded structural schematic view of the utility model;

[0031] Figure 11 is a partial exploded structural schematic view of the utility model;

[0032] Figure 12 is Figure 11 the enlarged structural schematic view of B of the utility model.

[0033] In the figure: 1 - vehicle body; 10 - convex edge; 11 - luggage compartment; 12 - handlebar; 13 - front wheel; 14 - rear wheel; 15 - auxiliary wheel; 2 - electric push rod; 20 - electric push rod mounting seat; 21 - telescopic rod; 22 - hinged seat; 221 - concave cavity; 23 - transmission connecting rod; 24 - guide rod; 241 - step portion; 3 - connecting rod assembly;

[0034] 31 - fixing seat; 32 - driving connecting rod; 321 - connecting rod hinged hole; 33 - rear wheel mounting seat. DETAILED DESCRIPTION

[0035] The utility model will be further described below with specific examples in combination with the drawings, as shown in Figures 1-12

[0036] A rear wheel extension structure of a luggage cart, comprising a vehicle body 1, the vehicle body 1 is provided with a luggage compartment 11, the vehicle body 1 is provided with a handlebar at the front, only the handlebar 12 is indicated in the drawing, and the handlebar at the end of the handlebar 12 is not placed. The vehicle body 1 is provided with a front wheel 13 and a rear wheel 14 below, as an optimization, an auxiliary wheel 15 can also be arranged at the rear of the vehicle body 1, which is beneficial to the stability of the vehicle body and reduces the possibility of the vehicle body overturning. The rear wheel 14 is arranged left and right with two, and the two rear wheels 14 are connected through a driving assembly, the driving assembly controls the two rear wheels 14 to move away from the vehicle body synchronously or move close to the vehicle body synchronously; the driving assembly comprises an electric push rod 2 and a connecting rod assembly 3, the connecting rod assembly 3 comprises a fixing seat 31 and a rear wheel mounting seat 33, the rear wheel 14 is rotationally arranged on the rear wheel mounting seat 33, and the fixing seat 31 and the rear wheel mounting seat 33 are connected through at least two driving connecting rods 32 arranged in parallel; the electric push rod 2 is fixed on the vehicle body 1, the telescopic rod 21 of the electric push rod acts on the driving connecting rod 32 or the rear wheel mounting seat 33, and the electric push rod 2 gives the driving force for the rear wheel 14 to move outward or inward; under the action of the two parallel driving connecting rods 32, the rear wheel 14 keeps the forward direction at all times in the process of moving outward or inward. In order to improve the stability of the driving connecting rod 32, the driving connecting rod 32 is arranged in pairs, and the same pair of driving connecting rods 32 is symmetrically arranged on the two sides of the fixing seat 31 and the rear wheel mounting seat 33, that is, the two driving connecting rods 32 arranged above and below form a pair, four driving connecting rods 32 are shown in the drawing, the four driving connecting rods 32 form two pairs, and the manufacturer can increase or decrease the driving connecting rods according to the actual situation, and the core is to make the structure of the driving assembly stable. As the manufacturer, if the electric push rod with adjustable telescopic rod extension distance is selected, the distance between the two rear wheels can be freely adjusted; if the electric push rod with only limit extension and limit retraction of the telescopic rod is selected, the two rear wheels can keep the retracted state and the unfolded state; the manufacturer can select the required electric push rod.

[0037] ​The transmission connecting rod 23 is rotatably arranged at one end of the telescopic rod 21 of the electric push rod and at the other end of the transmission connecting rod 23 is rotatably arranged at the driving connecting rod 32 or the rear wheel mounting seat 33; the transmission connecting rod 23 is symmetrically arranged at both sides of the telescopic rod 21 of the electric push rod, and the telescopic rod 21 of the electric push rod moves, and under the connection of the transmission connecting rod 23, the two rear wheels 14 move synchronously. The manufacturer can hinge the transmission connecting rod on the driving connecting rod or the rear wheel mounting seat according to the actual situation, and the two components can be hinged, as long as the synchronous movement of the rear wheels on both sides can be realized.

[0038] As preferred, the end of the electric push rod telescopic rod 21 is fixedly provided with a hinge seat 22, one end of the transmission connecting rod 23 is rotatably connected to the hinge seat 21, and the other end of the transmission connecting rod 23 is hinged to the middle connecting rod hinge hole 321 of the driving connecting rod 32. The hinge seat 22 is arranged for the following purposes: a, the hinge seat 22 receives the transmission connecting rod 23, making it easier for workers to assemble; b, the hinge seat 22 is in the shape of an I-beam, and the transmission connecting rod 23 is hinged in the cavity 221 of the hinge seat, so that the hinge position is built-in. The luggage trolley will inevitably encounter flying stones or bumps during riding, and the built-in hidden structure of the hinge position can protect the hinge position; c, a guide rod 24 is arranged between the hinge seat 22 and the fixed seat 31, the hinge seat 22 moves along the guide rod 24, and the hinge seat 22 is limited by the guide rod 24, so that the hinge seat 22 can only move linearly along the guide rod 24, effectively improving the structural stability of the driving assembly. The guide rod 24 is a metal rod, and bearings or wear-resistant sleeves can be arranged at the position where the hinge seat 22 cooperates with the guide rod 24 to reduce the moving resistance.

[0039] The guide rod 24 is fixedly arranged on the fixed seat 31, and the end of the guide rod 24 is provided with a stepped portion 241; when the hinge seat 22 abuts against the stepped portion 241, the hinge seat 22 moves to the limit position. The limit position is limited by the stepped portion 241 to ensure the stability of the structure.

[0040] One pair of driving connecting rods 32 is symmetrically provided with a connecting rod hinge hole 321, and the transmission connecting rod 23 is located between the two connecting rod hinge holes 321, and the shaft penetrates through the connecting rod hinge hole 321 and the transmission connecting rod 23 and rotatably connects the three.

[0041] The bottom of the vehicle body 1 is provided with a recess, and the electric push rod is hidden and arranged in the recess. The two sides of the vehicle body base are provided with protrusions 10, and the recess is formed between the two protrusions 10. The electric push rod 2 is protected by this structure, and the electric push rod 2 does not protrude outward, reducing the possibility of bumping.

[0042] The product of the present application will inevitably involve a control circuit and a power supply, which are not the protection points of the present utility model, and therefore are not specifically described. The setting of the power supply and the control circuit in the vehicle body is a simple technology in the industry, and the movement of the telescopic rod of the electric push rod controlled by the switch is common knowledge. How to make the rear wheel move laterally is the protection point of the present application.

[0043] The above embodiments are only preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model, so that: all equivalent changes made according to the structure, shape and principle of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A luggage cart rear wheel extension structure, comprising a cart body (1), a luggage box (11) is arranged on the cart body (1), a handle is arranged in front of the cart body (1), and a front wheel (13) and a rear wheel (14) are arranged below the cart body (1); characterized in that: Two rear wheels (14) are arranged on the left and right sides of the vehicle body (1), and the two rear wheels (14) are connected by a driving assembly. The driving assembly comprises an electric push rod (2) and a linkage assembly (3), the linkage assembly (3) comprises a fixed seat (31) and a rear wheel mounting seat (33), the rear wheel (14) is rotatably arranged on the rear wheel mounting seat (33), and the fixed seat (31) and the rear wheel mounting seat (33) are connected by at least two driving links (32) arranged in parallel.

2. The rear wheel extending structure of the trolley according to claim 1, wherein: The electric push rod is fixed on the vehicle body (1), the telescopic rod (21) of the electric push rod acts on the driving link (32) or the rear wheel mounting seat (33), and the electric push rod gives the rear wheel (14) a driving force for moving outward or inward.

3. The rear wheel extending structure of the trolley according to claim 2, characterized by: The driving assembly comprises a transmission linkage (23), one end of the transmission linkage (23) is rotatably arranged on the telescopic rod (21) of the electric push rod, and the other end of the transmission linkage (23) is rotatably arranged on the driving link (32) or the rear wheel mounting seat (33).

4. The rear wheel extending structure of the trolley according to claim 3, wherein: The transmission linkage (23) is symmetrically arranged on both sides of the telescopic rod (21) of the electric push rod, and the telescopic rod (21) of the electric push rod moves, and under the connection of the transmission linkage (23), the two rear wheels (14) move synchronously.

5. The rear wheel extending structure of the trolley according to claim 3, wherein: The end of the electric push rod telescopic rod (21) is fixedly provided with a hinge seat (22), one end of the transmission linkage (23) is rotatably connected to the hinge seat (22), and the other end of the transmission linkage (23) is hingedly connected to the middle part of the driving link (32).

6. The rear wheel extending structure of the trolley according to claim 5, wherein: The hinge seat (22) is in the shape of an I-shaped section, and the transmission linkage (23) is hingedly connected in the cavity of the hinge seat (22).

7. The rear wheel extending structure of the trolley according to claim 2 or 3 or 4 or 5 or 6, wherein: The hinge seat (22) and the fixed seat (31) are provided with a guide rod (24), and the hinge seat (22) moves along the guide rod (24).

8. The rear wheel extending structure of the trolley according to claim 7, wherein: The guide rod (24) is fixedly arranged on the fixed seat (31), and the end of the guide rod is provided with a stepped portion (241); when the hinge seat (22) abuts against the stepped portion (241), the hinge seat (22) moves to the limit position.

9. The rear wheel extending structure of the trolley according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8, wherein: The driving links (32) are arranged in pairs, and the driving links (32) in the same pair are symmetrically arranged on both sides of the fixed seat (31) and the rear wheel mounting seat (33).

10. The rear wheel extending structure of the trolley according to claim 9, wherein: One pair of the driving links (32) are symmetrically provided with linkage hinge holes (321), the transmission linkage (23) is located between the two linkage hinge holes (321), and a rotating shaft penetrates through the linkage hinge holes (321) and the transmission linkage (23) and rotatably connects them. The bottom of the vehicle body (1) is provided with a recess, and the electric push rod (2) is hidden and arranged in the recess. The two sides of the base of the vehicle body (1) are provided with protrusions (10), and the recess is formed between the two protrusions (10).

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