Carrying vehicle and driving assembly thereof

Abstract

The utility model relates to a driving assembly of a carrier, which comprises a driving wheel, a pair of universal wheels arranged on two sides of the driving wheel and a synchronizing mechanism connected with the pair of universal wheels, and the synchronizing mechanism comprises a pair of wheel seats and a synchronizing rod connected with the pair of wheel seats; a first pressure spring and a second pressure spring are respectively arranged on each wheel seat, and the telescopic axes of the first pressure spring and the second pressure spring are longitudinally arranged and are parallel to each other; the elastic rigidity of the first compression spring is smaller than that of the second compression spring, and the upper end of the first compression spring is higher than that of the second compression spring after installation is completed. The utility model further relates to the carrier with the driving assembly. According to the scheme, the floating adjustment effect can be achieved under the conditions of light load and heavy load of the carrier.

Description

Technical Field

[0001] The utility model relates to the technical field of transport vehicles, in particular to a transport vehicle and a drive assembly thereof. Background Art

[0002] Chinese utility model patent publication number CN 205131373U discloses a synchronized universal wheel mechanism, comprising a mounting base and two corresponding wheel seats, each secured to the mounting base. Universal wheels are mounted on the bottom of the wheel seats. The mechanism also includes a synchronization rod, the ends of which are secured to the corresponding wheel seats. The wheel seats are equipped with a wheel load adjustment device, which includes a hollow threaded shaft mounted longitudinally on the mounting base. A screw is positioned within the hollow shaft, extending through the shaft. A buffer sleeve is positioned above the screw and below the shaft. The screw passes through the shaft and then the buffer sleeve, with the end of the screw secured to the wheel seat via a nut. The buffer sleeve is made of an elastic material. As the screw applies force to the hollow shaft, which in turn applies force to the buffer sleeve, the sleeve elastically deforms, causing the entire wheel load adjustment device to drop in height, which in turn causes the entire wheel seat to drop in height. This increases the pressure between the universal wheel and the ground, increasing the load on the universal wheel, thereby enabling the universal wheel to share the load with the vehicle's drive wheels.

[0003] Trucks operate in applications with frequent vibrations and a wide load-bearing range. Frequent vibrations require a buffer structure with rapid response, rapid rebound, and a wide range of expansion and contraction. The aforementioned synchronous universal wheel mechanism, because the buffer sleeve can expand and contract within a certain range, can achieve a floating self-adjusting function of the universal wheel through the buffer sleeve within a certain range. However, the aforementioned mechanism is used in stackers, and it uses a buffer sleeve as the buffer material for the buffer universal wheel. However, the polyurethane cushion cannot achieve rapid rebound and large-scale compression, and its expansion and contraction range is very limited. It is not suitable for light-load, heavy-load, large-load range, and frequent vibration applications of trucks. Summary of the Invention

[0004] In order to solve the above problems, the purpose of the present utility model is to provide a transport vehicle and a drive assembly thereof.

[0005] A drive assembly of a transport vehicle includes a drive wheel, a pair of universal wheels arranged on both sides of the drive wheel, and a synchronization mechanism connecting the pair of universal wheels, the synchronization mechanism including a pair of wheel seats and a synchronization rod connecting the pair of wheel seats; each wheel seat is respectively provided with a first compression spring and a second compression spring, the telescopic axes of the first compression spring and the second compression spring are longitudinally arranged and parallel to each other; the elastic stiffness of the first compression spring is less than the elastic stiffness of the second compression spring, and after installation is completed, the upper end of the first compression spring is higher than the upper end of the second compression spring.

[0006] Preferably, it includes a positioning plate, which includes a plate fixed to each other and an upper limit plate, the side plate is fixed to the vehicle body through a connecting piece, the upper limit plate is fixed to the side plate and has a first limiting portion and a second limiting portion arranged toward the wheel seat, the first limiting portion corresponds to the first compression spring, the second limiting portion corresponds to the second compression spring, and the first limiting portion is higher than the second limiting portion.

[0007] Preferably, the positioning plate is integrally formed.

[0008] Preferably, it includes a guide screw, the upper end of which is fixed to the first limiting portion by threaded engagement, and the first compression spring is sleeved on the guide screw; and / or the upper end of the guide screw is fixed to the second limiting portion by threaded engagement, and the second compression spring is sleeved on the guide screw.

[0009] Preferably, the wheel seat is provided with a first positioning seat arranged upward, and the second limiting portion is provided with a second positioning seat facing the wheel seat. The first positioning seat and the second positioning seat are coaxially arranged and the two ends of the second compression spring are respectively sleeved on the first positioning seat and the second positioning seat.

[0010] The present utility model further aims to provide a transport vehicle comprising a drive assembly of the transport vehicle as described in any one of the above items.

[0011] Due to the adoption of the above-mentioned structure, the utility model provides a first compression spring and a second compression spring with different elastic stiffnesses, and the upper end height of the first compression spring is higher than the upper end height of the second compression spring. Thus, by selecting appropriate elastic stiffness and height difference, it is possible to realize that when the transport vehicle is lightly loaded, the first compression spring with small elastic stiffness telescopes and floats, and the second compression spring with large elastic stiffness does not bear weight; when the transport vehicle is heavily loaded, the second compression spring with large elastic stiffness telescopes and floats, and the first compression spring does not work. Therefore, the above-mentioned drive assembly can achieve its floating adjustment effect under both light and heavy load conditions of the transport vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the present application (the driving wheel is not shown);

[0013] Figure 2 for Figure 1 Schematic diagram of the structure from another angle (the first compression spring and the second compression spring are not shown).

[0014] Reference numerals:

[0015] Universal wheel 1, wheel seat 2, synchronization rod 3, first compression spring 41, second compression spring 42, positioning plate 5, guide screw 6, gasket 71, fixing sleeve 72, first positioning seat 81, second positioning seat 82. DETAILED DESCRIPTION

[0016] The embodiments of the present utility model are described in detail below.

[0017] Example 1:

[0018] This embodiment provides a driving assembly of a transport vehicle, such as Figure 1 and Figure 2 As shown, the invention comprises a drive wheel, a pair of universal wheels 1 arranged on either side of the drive wheel, and a synchronization mechanism connecting the pair of universal wheels 1. The synchronization mechanism comprises a pair of wheel seats 2 and a synchronization rod 3 connecting the pair of wheel seats 2. Each wheel seat 2 is provided with a first compression spring 41 and a second compression spring 42, respectively. The expansion and contraction axes of the first compression spring 41 and the second compression spring 42 are longitudinally arranged and parallel to each other. The elastic stiffness of the first compression spring 41 is less than the elastic stiffness of the second compression spring 42, and after installation, the upper end of the first compression spring 41 is higher than the upper end of the second compression spring 42.

[0019] According to the above arrangement, when the transport truck vibrates during driving, the floating of the universal wheel 1 will cause the first compression spring 41 and / or the second compression spring 42 to expand and contract. The first compression spring 41 and the second compression spring 42 have different elastic stiffnesses. In a specific embodiment, the first compression spring 41 is a soft compression spring and the second compression spring 42 is a hard compression spring. In addition, by selecting the appropriate compression spring length and installation height, the first spring can expand and contract first when the universal wheel 1 floats. In a specific embodiment, the bottom installation heights of the first compression spring 41 and the second compression spring 42 can be the same, and the upper end of the first compression spring 41 is higher than the upper end of the second compression spring 42. Due to the use of soft and hard compression springs, the soft compression spring works when the transport truck is lightly loaded, and the hard compression spring works when the transport truck is heavily loaded, thereby achieving a floating adjustment effect in both light and heavy load states of the transport truck.

[0020] like Figure 2 As shown, the synchronization mechanism realizes the upper limit of the first compression spring 41 and the second compression spring 42 through the positioning plate 5, and realizes the lower limit of the first compression spring 41 and the second compression spring 42 through the wheel seat 2. The positioning plate 5 includes a plate and an upper limit plate fixed to each other, the side plate is fixed to the vehicle body through a connecting piece, the upper limit plate is fixed to the side plate and has a first limit portion and a second limit portion set toward the wheel seat 2, the first limit portion is set corresponding to the first compression spring 41, and the second limit portion is set corresponding to the second compression spring 42, and the first limit portion is higher than the second limit portion. With this arrangement, the upper limit of the first compression spring 41 and the second compression spring 42 can be achieved by the same workpiece, and the installation structure is simple. Preferably, the positioning plate 5 is integrally formed to enhance the overall strength of the positioning plate 5.

[0021] like Figure 1 and Figure 2As shown, the guide screw 6 includes a lead screw 6, the upper end of which is fixed to a first limiting portion by threaded engagement, and a first compression spring 41 is sleeved on the lead screw 6; and / or the upper end of the lead screw 6 is fixed to a second limiting portion by threaded engagement, and a second compression spring 42 is sleeved on the lead screw 6. The first compression spring 41 and / or the second compression spring 42 are guided for extension and contraction by the lead screw 6.

[0022] Preferably, the upper and lower ends of the first and second compression springs 41 and 42 are provided with anti-friction members. In this embodiment, the anti-friction members may be gaskets 71 or fixing sleeves 72, etc. The provision of anti-friction members can prevent the compression springs from wearing the positioning member and the wheel seat 2. In this embodiment, the wheel seat 2 is provided with a first positioning seat 81 disposed upward, and the second limiting portion is provided with a second positioning seat 82 facing the wheel seat 2. The first positioning seat 81 and the second positioning seat 82 are coaxially arranged, and the two ends of the second compression spring 42 are respectively sleeved on the first positioning seat 81 and the second positioning seat 82. The first positioning seat 81 and the wheel seat 2, as well as the second positioning seat 82 and the positioning member, are respectively fixed by threaded connectors. The first positioning seat 81 is provided with a downwardly protruding positioning shaft, and the second positioning seat 82 is provided with an upwardly protruding positioning shaft. The two ends of the second compression spring 42 are respectively sleeved on the positioning shafts to achieve positioning of the second compression spring 42. Preferably, the lower end of the guide screw 6 extends downward from the positioning axis of the second positioning seat 82 , thereby achieving telescopic guidance of the second compression spring 42 through the guide screw 6 .

[0023] like Figure 2 As shown, the synchronization rod 3 in this embodiment is located at the rear side of the wheel seat 2. This arrangement of the synchronization rod 3 close to the wheel seat 2 takes up less space. The synchronization rod 3 is mounted on the vehicle seat via a synchronization rod 3 mounting plate. The synchronization rod 3 can rotate relative to the synchronization rod 3 mounting plate to float synchronously with the wheel seat 2.

[0024] Example 2:

[0025] This embodiment provides a transport vehicle, including the drive assembly of the transport vehicle in embodiment 1.

[0026] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A drive assembly of a transport vehicle, comprising a drive wheel, a pair of universal wheels arranged on both sides of the drive wheel, and a synchronization mechanism connecting the pair of universal wheels, characterized in that: The synchronization mechanism includes a pair of wheel seats and a synchronization rod connecting the pair of wheel seats; each wheel seat is respectively provided with a first compression spring and a second compression spring, and the telescopic axes of the first compression spring and the second compression spring are longitudinally arranged and parallel to each other; the elastic stiffness of the first compression spring is less than the elastic stiffness of the second compression spring, and after installation is completed, the upper end of the first compression spring is higher than the upper end of the second compression spring.

2. The drive assembly of a transport vehicle according to claim 1, characterized in that: It includes a positioning plate, which includes side plates and an upper limit plate fixed to each other, the side plates are fixed to the vehicle body through connecting parts, the upper limit plate is fixed to the side plates and has a first limiting portion and a second limiting portion arranged toward the wheel seat, the first limiting portion corresponds to the first compression spring, the second limiting portion corresponds to the second compression spring, and the first limiting portion is higher than the second limiting portion.

3. The drive assembly of a transport vehicle according to claim 2, characterized in that: The positioning plate is integrally formed.

4. The drive assembly of a transport vehicle according to claim 1, characterized in that: It includes a guide screw, the upper end of which is fixed to the first limiting part by threaded engagement, and the first compression spring is sleeved on the guide screw; and / or the upper end of the guide screw is fixed to the second limiting part by threaded engagement, and the second compression spring is sleeved on the guide screw.

5. The drive assembly of a transport vehicle according to claim 1, characterized in that: The wheel seat is provided with a first positioning seat arranged upward, and the second limiting part is provided with a second positioning seat facing the wheel seat. The first positioning seat and the second positioning seat are coaxially arranged and the two ends of the second compression spring are respectively sleeved on the first positioning seat and the second positioning seat.

6. A transport vehicle, characterized in that: A drive assembly comprising a transport vehicle as claimed in any one of claims 1 to 5.

Images