Four-wheel shifter

Abstract

The utility model provides a four-wheel shifter which comprises a traction wheel train, a connecting frame, a connecting assembly, a push-pull rod and a control system, the connecting frame is fixed above the traction wheel train, the connecting assembly and the control system are both fixed on the connecting frame, the push-pull rod is installed on the connecting frame, the connecting assembly is used for being connected with a dragged device, and the control system is used for being connected with the dragged device. A front supporting wheel and a rear supporting wheel are arranged at the two ends of the connecting frame respectively and arranged on the two sides of the traction wheel train. The traction tool solves the technical problems that an existing traction tool is prone to reverse rotation or even overturning of the whole trailer when the trailer with the large weight is dragged, and large potential safety hazards exist. The traction device can be widely applied to traction of trailer type vehicles.

Description

Technical Field

[0001] This utility model relates to a traction tool, and more particularly to a four-wheel shifter. Background Technology

[0002] A trailer repositioning device is a towing tool used to slightly change the parking position of a towed caravan after it has detached from the towing vehicle.

[0003] Chinese utility model patent with authorization announcement number CN211442351U discloses "an electric tractor", which includes a rear axle motor, a rear wheel and a front wheel, a connecting frame, a handlebar, a power supply box and a ball joint seat. In use, the ball joint of the ball joint seat is pulled out and connected to an external logistics vehicle. Then the rear axle motor drives the rear wheel, and the external logistics vehicle connected to the electric tractor is moved by manually pulling the handlebar.

[0004] We know that the force exerted by a towed caravan on the connection point with the tractor is not vertically downward, but rather involves a torque that swings around the caravan's wheels. Therefore, the technical solution disclosed in the aforementioned patent can only be used for small logistics vehicles with relatively low load capacity. For towed caravans with greater self-weight, the torque would force the tractor to tilt away from the handlebars around the rear wheels, resulting in the front wheels lifting up, and even the possibility of the entire tractor overturning, posing a significant safety hazard. Summary of the Invention

[0005] This utility model addresses the technical problem that existing towing tools are prone to overturning or even overturning when towing towed caravans with large self-weight, posing a significant safety hazard. It provides a four-wheel shifter that can effectively prevent the vehicle from overturning or overturning during towing, has high safety performance, is easy to operate, and has better versatility.

[0006] Therefore, the technical solution of this utility model is a four-wheel shifter, including a traction wheel system, a connecting frame, a connecting component, a push-pull rod, and a control system. The connecting frame is fixed above the traction wheel system, and the connecting component and the control system are both fixed on the connecting frame. The push-pull rod is installed on the connecting frame. The connecting component is used to connect the traction device. A front support wheel and a rear support wheel are respectively provided at both ends of the connecting frame, and the front support wheel and the rear support wheel are located on both sides of the traction wheel system.

[0007] Preferably, the traction wheel system includes an axle, a drive motor, a transmission device, and two traction wheels. The two traction wheels are located at both ends of the axle. The drive motor drives the traction wheels to rotate through the transmission device, which is a gear drive or a chain drive.

[0008] Preferably, with the support of the traction wheel, at least one of the front support wheel and the rear support wheel is suspended in the air.

[0009] Preferably, the connecting frame includes a crossbeam, a front longitudinal beam, and a rear longitudinal beam. Two support columns are provided on the axle. The crossbeam is fixed above the support columns. The front and rear longitudinal beams are perpendicular to the crossbeam and installed on both sides of the crossbeam, with the connection point located in the middle of the crossbeam. The front support wheel is fixedly installed on the lower part of the front longitudinal beam at the end away from the crossbeam, and the rear support wheel is fixedly installed on the lower part of the rear longitudinal beam at the end away from the crossbeam.

[0010] Preferably, the connecting assembly includes an outer cylinder, an inner cylinder, and a ball head. The outer cylinder is vertically fixed to the crossbeam, the inner cylinder is fitted inside the outer cylinder, the inner cylinder is located above the crossbeam, and nuts are provided at both ends of the inner cylinder. The ball head is threaded onto the nut at one end.

[0011] Preferably, the outer cylinder and the inner cylinder are provided with limiting pin holes of the same size and are connected by limiting pins, and the limiting pin holes on the inner cylinder are located at a position offset from its axial center plane.

[0012] Preferably, an angle adjusting component is fixedly installed at the end of the front longitudinal beam away from the cross beam. The angle adjusting component has a U-shaped cross section, and hinge holes are provided through its two side walls. One end of the push-pull rod is hinged to the angle adjusting component via a hinge shaft and the hinge hole. Several indexing pin holes are provided around the hinge hole on the two side walls of the angle adjusting component. The push-pull rod is provided with a mating hole with the same size as the indexing pin holes. The tilt of the push-pull rod is adjusted by the indexing pin passing through the mating hole and the indexing pin holes at different angles.

[0013] Preferably, the tilt and length of the push-pull rod are adjustable. The push-pull rod includes an inner square tube and an outer square tube, which are sleeved together. The inner square tube and the outer square tube are clearance-fitted. The side wall of the outer square tube is provided with a locking hole, and the side wall of the inner square tube is provided with a plurality of adjusting pin holes that match the size of the locking hole. The locking hole is connected to one of the adjusting pin holes by an adjusting pin.

[0014] Preferably, the control system includes a controller, a battery pack, and a command terminal. A housing is provided on the front longitudinal beam, and the controller and battery pack are housed inside the housing. The command terminal includes a throttle lever and a direction switching switch. A handle is provided at the upper end of the push-pull rod, the throttle lever is located on the handle, and the direction switching switch is located on the side wall of the inner square tube. The command terminal is connected to the controller via a signal line.

[0015] Preferably, the side wall of the housing is provided with a power switch and a charging interface that are connected to the controller.

[0016] The beneficial effects of this utility model are:

[0017] (1) By setting front support wheels and rear support wheels on both sides of the axle of the traction wheel system, even when the towed object is heavy, the ball head is subjected to a backward flipping force under the action of the towed object. With the support of the rear support wheel, the vehicle can be effectively prevented from flipping or even overturning, which greatly improves the safety of the traction process.

[0018] (2) Setting the front support wheel and the rear support wheel so that they cannot touch the ground at the same time can avoid the phenomenon of the traction wheel being suspended in the air, thus effectively ensuring traction efficiency;

[0019] (3) The upper limit pin hole of the inner cylinder of the connecting component is located at a position off the axial center of the inner cylinder. The height of the connecting component can be adjusted by flipping the upper and lower ends of the inner cylinder, thereby improving the versatility of the product.

[0020] (4) The push-pull rod is telescopic and adjustable in angle, which can meet the needs of operators with different heights or different usage habits and improve the comfort of use;

[0021] (5) By setting up an instruction terminal connected to the controller, and placing the throttle lever of the instruction terminal on the handle, placing the direction switching switch on the side wall of the inner square tube, and setting the power switch and charging interface connected to the controller on the side wall of the housing, the convenience of operation is improved. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0023] Figure 2 This is a three-dimensional structural diagram of the traction wheel system according to an embodiment of the present invention;

[0024] Figure 3 This is a three-dimensional structural diagram of the connecting frame according to an embodiment of the present utility model;

[0025] Figure 4 This is a three-dimensional structural diagram of the connecting component according to an embodiment of the present utility model;

[0026] Figure 5 This is a schematic diagram of the assembly of the inner and outer cylinders in the connecting assembly of this utility model embodiment;

[0027] Figure 6 yes Figure 5 A schematic diagram of the assembly of the inner cylinder with the outer cylinder after the inner cylinder has been flipped.

[0028] Figure 7 This is a schematic diagram of the disassembled structure of the ball head and nut in an embodiment of this utility model;

[0029] Figure 8 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0030] Figure 9 This is a schematic diagram of the internal structure of the container box according to an embodiment of the present utility model;

[0031] Figure 10 This is a schematic diagram of the instruction terminal configuration according to an embodiment of this utility model;

[0032] Figure 11 This is a schematic diagram of one usage state of an embodiment of the present utility model;

[0033] Figure 12 This is a schematic diagram of another usage state of this utility model embodiment.

[0034] Explanation of symbols in the diagram:

[0035] 100. Traction wheel system; 110. Axle; 120. Drive motor; 130. Transmission device; 140. Traction wheel; 200. Connecting frame; 210. Crossbeam; 211. Support column; 220. Front longitudinal beam; 230. Rear longitudinal beam; 240. Front support wheel; 250. Rear support wheel; 300. Connecting assembly; 310. Outer cylinder; 320. Inner cylinder; 330. Ball joint; 340. Limit pin hole; 350. Limit pin; 360. Nut; 400. Push-pull rod; 410. Mating hole; 420. Inner square tube; 421. Adjusting pin hole; 430. Outer square tube; 431. Locking hole; 440. Handle; 500. Angle adjustment component; 510. Hinge hole; 520. Indexing pin hole; 600. Control system; 610. Controller; 620. Battery pack; 630. Command terminal; 631. Direction switching switch; 632. Throttle handle; 640. Storage box; 650. Battery switch; 660. Charging interface. Detailed Implementation

[0036] The present invention will be further described below with reference to the embodiments.

[0037] like Figure 1 As shown, a four-wheel shifter includes a traction wheel system 100, a connecting frame 200, a connecting assembly 300, a push-pull rod 400, and a control system 600.

[0038] like Figure 2 As shown, the traction wheel system 100 includes an axle 110, a drive motor 120, a transmission device 130, and two traction wheels 140. The two traction wheels 140 are located at both ends of the axle 110. The drive motor 120 is fixed to the axle 110 via the transmission device 130. The output shaft of the drive motor 120 drives the traction wheels 140 to rotate via the transmission device 130. The transmission device 130 can be a gear drive or a chain drive. Since the structure of the traction wheel system 100 is existing technology, it will not be described in detail here.

[0039] like Figure 3As shown, the connecting frame 200 includes a crossbeam 210, a front longitudinal beam 220, and a rear longitudinal beam 230. The crossbeam 210 is mounted above the axle 110 via two support columns 211. The front longitudinal beam 220 and the rear longitudinal beam 230 are perpendicular to the crossbeam 210 and are located on both sides of the crossbeam 210, with one end of each beam connected to the middle of the crossbeam 210. A front support wheel 240 and a rear support wheel 250 are respectively provided at the ends of the front longitudinal beam 220 and the rear longitudinal beam 230 away from the crossbeam 210.

[0040] like Figure 3-7 As shown, the connecting assembly 300 includes an outer cylinder 310, an inner cylinder 320, and a ball head 330. The outer cylinder 310 is vertically fixed to the crossbeam 210 of the connecting frame 200, and the inner cylinder 320 is coaxially disposed inside the outer cylinder 310. Limit pin holes 340 are formed on both the outer cylinder 310 and the inner cylinder 320, and limit pins 350 axially limit their movement. Nuts 360 are provided at both ends of the inner cylinder 320, and the nuts 360 are fixed to the inner cylinder 320; the two can be fixed by end-face welding. The ball head 330 can be threadedly connected to either nut 360 as needed.

[0041] The limiting pin hole 340 opened on the inner cylinder 320 is not opened in the middle of the axial direction of the inner cylinder 320, but is offset and set at a position off from its axial center plane. The "axial center plane" refers to the plane located in the middle of the inner cylinder 320 and perpendicular to its axis. In this way, when in use, the height of the ball head 330 can be switched by changing the direction of the inner cylinder 320 to suit two common heights of towed caravans.

[0042] like Figure 1 and Figure 8 As shown, an angle adjustment component 500 is provided between the front longitudinal beam 220 and the front support wheel 240. In this embodiment, the angle adjustment component 500 has a U-shaped cross-section, with hinge holes 510 penetrating its two side walls. One end of the push-pull rod 400 is hinged to the angle adjustment component 500 via a hinge shaft (not shown in the figure) and the hinge hole 510. Several indexing pin holes 520 are provided around the hinge hole 510 on the two side walls of the angle adjustment component 500. A mating hole 410 is provided on the push-pull rod 400. An indexing pin (not shown in the figure) passes through the mating hole 410 and any of the indexing pin holes 520, which can restrict the rotation of the push-pull rod 400 relative to the angle adjustment component 500, thereby setting and adjusting the tilt angle of the push-pull rod 400. The angle adjustment component 500 is used to adapt to the operating habits of different operators and improve the user experience.

[0043] like Figure 1As shown, the push-pull rod 400 is a telescopic rod assembly, comprising an inner square tube 420 and an outer square tube 430. A locking hole 431 is formed on the side wall of the outer square tube 430, and several adjusting pin holes 421 of different heights are formed on the side wall of the inner square tube 420. Adjusting pins (not shown in the figure) lock the locking hole 431 with one of the adjusting pin holes 421, thus limiting the axial extension and retraction of the inner square tube 420 within the outer square tube 430 and setting the usable length of the push-pull rod 400. To facilitate pushing and pulling and maintain direction, a handle 440 is provided at the end of the push-pull rod 400 away from the angle adjusting member 500.

[0044] The control system 600 includes a controller 610, a battery pack 620, and a command terminal 630, such as Figure 9 As shown, a housing 640 is provided on the front longitudinal beam 220. The controller 610 and battery pack 620 are housed inside the housing 640. A power switch 650 connected to the controller 610 and a charging interface 660 are provided on the side wall of the housing 640. The command terminal 630 includes a direction switching switch 631 and a throttle handle 632, as shown. Figure 10 As shown, the direction switching switch 631 is located on the side wall of the inner square tube 420, and the throttle handle 632 is located on the handle 440, which is connected to the controller 610 via a signal line (not shown in the figure). The direction switching switch 631 is a two-position rocker switch, which is used to switch the rotation direction of the drive motor 120, thereby switching the travel direction of the shifter and realizing the forward or backward movement of the shifter.

[0045] When using this application, the height of the ball joint 330 can first be preset, that is, the limiting pin 350 is pulled out from the limiting pin hole 340, the inner cylinder 320 is pulled out from the outer cylinder 310, the ball joint 330 is removed, the inner cylinder 320 is reversed, the ball joint 330 is installed, the inner cylinder 320 is inserted into the outer cylinder 310, and locked by the limiting pin 350 inserted into the limiting pin hole 340; then the direction switching switch 631 is set, the throttle handle 632 is turned, so that the drive motor 120 drives the towing wheel 140 to rotate, to the ball joint seat of the towed caravan, so that the ball joint 330 is aligned and connected to the ball joint seat; finally, the direction switching switch 631 is set, the throttle handle 632 is turned, and the position of the towed caravan is adjusted under the rolling support of the towing wheel 140.

[0046] like Figure 11-12As shown, the connecting frame 200 in this application does not remain horizontal under the support of the front support wheel 240, the rear support wheel 250, and the traction wheel 140. Instead, when the traction wheel 140 is in contact with the ground, one of the front support wheel 240 or the rear support wheel 250 is in contact with the ground for auxiliary support, while the other is raised as a backup to prevent the entire structure from tipping over. Compared to the simultaneous contact of the traction wheel 140, the front support wheel 240, and the rear support wheel 250 with the ground, this arrangement improves the versatility of the structure. For example, when encountering a slope, it avoids the support wheel supporting the traction wheel 140 via the connecting frame 200, which would result in poor contact of the traction wheel 140 with the ground and weaken the traction effect.

[0047] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A four-wheel shifter, characterized in that, The device includes a traction wheel system, a connecting frame, a connecting assembly, a push-pull rod, and a control system. The connecting frame is fixed above the traction wheel system. The connecting assembly and the control system are both fixed on the connecting frame. The push-pull rod is installed on the connecting frame. The connecting assembly is used to connect the traction device. A front support wheel and a rear support wheel are respectively provided at both ends of the connecting frame. The front support wheel and the rear support wheel are located on both sides of the traction wheel system.

2. The four-wheel shifter according to claim 1, characterized in that, The traction wheel system includes an axle, a drive motor, a transmission device, and two traction wheels. The two traction wheels are located at both ends of the axle. The drive motor drives the traction wheels to rotate through the transmission device, which is either a gear drive or a chain drive.

3. The four-wheel shifter according to claim 2, characterized in that, With the support of the traction wheel, at least one of the front support wheel and the rear support wheel is suspended in the air.

4. The four-wheel shifter according to claim 2, characterized in that, The connecting frame includes a crossbeam, a front longitudinal beam, and a rear longitudinal beam. Two support columns are provided on the axle. The crossbeam is fixed above the support columns. The front and rear longitudinal beams are perpendicular to the crossbeam and are installed on both sides of the crossbeam, with the connection point located in the middle of the crossbeam. The front support wheel is fixedly installed on the lower part of the front longitudinal beam at the end away from the crossbeam, and the rear support wheel is fixedly installed on the lower part of the rear longitudinal beam at the end away from the crossbeam.

5. The four-wheel shifter according to claim 4, characterized in that, The connecting assembly includes an outer cylinder, an inner cylinder, and a ball head. The outer cylinder is vertically fixed to the crossbeam, and the inner cylinder is fitted inside the outer cylinder. The inner cylinder is located above the crossbeam, and nuts are provided at both ends of the inner cylinder. The ball head is threaded onto the nut at one end.

6. The four-wheel shifter according to claim 5, characterized in that, The outer cylinder and the inner cylinder are provided with limit pin holes of the same size and are connected by limit pins. The limit pin holes on the inner cylinder are located at a position that is off-center from its axial center plane.

7. The four-wheel shifter according to claim 4, characterized in that, An angle adjustment component is fixedly installed at the end of the front longitudinal beam away from the cross beam. The angle adjustment component has a U-shaped cross section, and hinge holes are provided through its two side walls. One end of the push-pull rod is hinged to the angle adjustment component via a hinge shaft and the hinge hole. Several indexing pin holes are provided around the hinge hole on the two side walls of the angle adjustment component. The push-pull rod is provided with a mating hole with the same size as the indexing pin holes. The tilt of the push-pull rod is adjusted by the indexing pin passing through the mating hole and the indexing pin holes at different angles.

8. The four-wheel shifter according to claim 4, characterized in that, The push-pull rod is adjustable in both tilt and length. The push-pull rod includes an inner square tube and an outer square tube, which are sleeved together. The inner square tube and the outer square tube are clearance-fitted. The outer square tube has a locking hole on its side wall, and the inner square tube has several adjusting pin holes that match the size of the locking hole on its side wall. The locking hole is connected to one of the adjusting pin holes by an adjusting pin.

9. The four-wheel shifter according to claim 8, characterized in that, The control system includes a controller, a battery pack, and a command terminal. A housing is provided on the front longitudinal beam, and the controller and battery pack are housed inside the housing. The command terminal includes a throttle lever and a direction switching switch. A handle is provided at the upper end of the push-pull rod, the throttle lever is located on the handle, and the direction switching switch is located on the side wall of the inner square tube. The command terminal is connected to the controller via a signal line.

10. The four-wheel shifter according to claim 9, characterized in that, The side wall of the container is equipped with a power switch and a charging interface that are connected to the controller.

Images