KR102530947B1 - Mounting bracket for tongue jack wheel of trailer and tongue jack wheel assembly including the same - Google Patents

Abstract

The present disclosure relates to a mounting bracket for a tongue jack wheel of a trailer connected to a vehicle to be transferred, which comprises: a coupling body unit directly coupled to a support frame of a trailer for connection between the vehicle and the trailer; and a connection body unit provided in a lower portion of the coupling body unit and connecting a tongue jack wheel to the coupling body unit. An upper end part of a support shaft of the tongue jack wheel is coupled to a lower portion of the connection body unit.

Description

Tongue jack wheel mounting bracket of a trailer and a tongue jack wheel assembly including the same

Embodiments of the present disclosure relate to a trailer tongue jack wheel mounting bracket and a tongue jack wheel assembly including the same.

In general, a jack wheel is used as a means for facilitating an operation of connecting or separating a support frame (or A frame) of a trailer from a vehicle. The jack wheel has a wheel at the bottom and is installed in a state standing at a point adjacent to the support frame to have a structure capable of supporting the support frame in a horizontal state while the wheel side is in contact with the ground.

However, conventional mounting brackets for fixing the vertical shaft portion of the jack could be installed on the support frame of the trailer only when the inertia brake was attached. Accordingly, there is a problem in that the manufacturing cost of the tongue jack wheel mounting bracket increases and the cost of the product increases.

US Patent Registration No. 10,974,555 (2021.04.13.)

Embodiments of the present disclosure are to provide a shelving device that improves the problems of the conventional shelving device described above, and includes a tongue jack wheel mounting bracket of a trailer capable of combining and supporting a tongue jack wheel without mounting an inertia brake, and including the same To provide a tongue jack wheel assembly.

The technical problems to be achieved in the embodiments of the present disclosure are not limited to the above-mentioned matters, and other technical problems that are not mentioned are not limited to those skilled in the art from various embodiments to be described below. can be considered by

According to one embodiment of the present disclosure, a tongue jack wheel mounting bracket for a trailer that is transported connected to a vehicle includes: a coupling body portion that is directly coupled to a support frame of the trailer for connecting the vehicle and the trailer; and a connection body provided under the coupling body and connecting the tongue jack wheel to the coupling body, wherein the upper end of the support shaft of the tongue jack wheel is coupled to the lower portion of the connection body. Jackwheel mounting brackets can be provided.

The coupling body portion includes a pair of coupling plates directly contact-coupled to both sides of the support frame of the trailer, and the coupling body portion connects lower ends of the pair of coupling plates between the pair of coupling plates. connecting plate to; and a fastening plate extending downward from a lower surface of the connecting plate, and an upper end of a support shaft of the tongue jack wheel may be coupled to the fastening plate.

The coupling body portion is a pair of coupling support blocks contact-coupled to both sides of the support frame of the trailer, formed in a hollow rectangular parallelepiped shape and having an open lower surface; a pair of lift guides each coupled to an open lower portion of the pair of coupling support blocks and movable in a vertical direction within the coupling support blocks; and a first buffer member disposed between a closed upper surface of each of the pair of coupling support blocks and each of the pair of lift guides and having an elastic restoring force, wherein the connection body portion comprises: It is composed of a connection plate coupled to a lower surface and disposed parallel to the ground, and the pair of elevating guides and the connection plate may be downwardly supported by the first buffer member.

The coupling body part further includes a pair of piezo blocks respectively disposed on the inner upper end of the pair of coupling support blocks, and the upper end of the first buffer member is contacted and supported on the lower surface of each of the pair of piezo blocks. , Each of the pair of piezo blocks is configured to receive a current from the outside, and is configured to change a length in a direction perpendicular to the ground according to the magnitude of the applied current, and the first buffer member is on the ground of the piezo block As the length in the vertical direction changes, the magnitude of the supporting force for pressing the elevating guide may change.

The mounting bracket further includes a control unit that acquires driving speed information of the vehicle to which the trailer is connected, and the control unit determines the size of a current value applied to the piezo block based on the acquired driving speed information of the vehicle. can decide

In the tongue jack wheel assembly including the mounting bracket and the tongue jack wheel coupled to the mounting bracket, the tongue jack wheel includes: a support shaft formed to have a predetermined length in a direction perpendicular to the ground; and a support wheel rotatably coupled to a lower end of the support shaft and capable of contacting the ground, and the support shaft may include an adjustment cylinder driven to adjust the length of the support shaft.

The support shaft may include a first vertical shaft coupled to the lower end of the control cylinder; a second vertical shaft connected to a lower end of the first vertical shaft; And a buffer shaft unit connecting the first vertical shaft and the second vertical shaft, wherein the support wheel is coupled to a lower end of the second vertical shaft, and the buffer shaft unit includes the first vertical shaft and the A second buffer member may be provided to elastically support the second vertical shaft along the longitudinal direction of the support shaft.

The support shaft further includes a horizontal support block extending in a horizontal direction from a lower end of the second vertical shaft, and the tongue jack wheel further includes a ground portion provided on the horizontal support block, and the ground portion is perpendicular to the ground A seating plate is configured to be movable in one direction, and the seating plate makes surface contact with the ground as it moves downward to provide ground friction to the tongue jack wheel.

According to another embodiment of the present disclosure, in a tongue jack wheel assembly including a tongue jack wheel mounting bracket of a trailer connected to a vehicle and transported, and a tongue jack wheel coupled to the mounting bracket, the mounting bracket is attached to a support frame of the trailer Coupling body portion that is directly coupled; and a connection body provided at a lower portion of the coupling body portion and configured to connect the tongue jack wheel to the coupling body portion, wherein an upper end portion of a support shaft of the tongue jack wheel is coupled to a lower portion of the connection body portion, and the tongue jack wheel, The support shaft formed to have a predetermined length in a direction perpendicular to the ground; and a support wheel rotatably coupled to a lower end of the support shaft and capable of contacting the ground, wherein the support shaft includes an adjustment cylinder driven to adjust the length of the support shaft, wherein the support shaft includes an adjustment cylinder A first vertical shaft coupled to the lower end of; a second vertical shaft connected to a lower end of the first vertical shaft; And a buffer shaft unit connecting the first vertical shaft and the second vertical shaft, wherein the support wheel is coupled to a lower end of the second vertical shaft, and the buffer shaft unit includes the first vertical shaft and the A second buffer member for elastically supporting a second vertical shaft along the longitudinal direction of the support shaft is provided, and the support shaft further includes a horizontal support block extending in a horizontal direction from a lower end of the second vertical shaft, , The tongue jack wheel further includes a grounding portion provided on the horizontal support block, the grounding portion includes a seating plate configured to be movable in a direction perpendicular to the ground, and the seating plate is flat on the ground as it moves downward. It is possible to provide a tongue jack wheel assembly, which is brought into contact to provide ground friction to the tongue jack wheel.

According to another embodiment of the present disclosure, in a tongue jack wheel assembly including a tongue jack wheel mounting bracket of a trailer connected to a vehicle and transported, and a tongue jack wheel coupled to the mounting bracket, the mounting bracket is attached to a support frame of the trailer Coupling body portion that is directly coupled; and a connection body provided below the coupling body and connecting the tongue jack wheel to the coupling body, wherein the tongue jack wheel includes a support shaft formed to have a predetermined length in a direction perpendicular to the ground; and a support wheel rotatably coupled to a lower end of the support shaft and capable of contacting the ground, an upper end of the support shaft of the tongue jack wheel coupled to a lower portion of the connection body, and the coupling body unit, It further includes a pair of piezo blocks respectively disposed on the inner upper end of the support block, the upper end of the first buffer member is contacted and supported on the lower surface of each of the pair of piezo blocks, and each of the pair of piezo blocks, It is configured to receive current from the outside, and is configured to change the length in a direction perpendicular to the ground according to the magnitude of the applied current, and the first buffer member is configured to change the length of the piezo block in a direction perpendicular to the ground. The magnitude of the supporting force pressing the is changed, and the mounting bracket further includes a control unit that obtains driving speed information of the vehicle to which the trailer is connected, and the control unit, based on the acquired driving speed information of the vehicle, It is possible to provide a tongue jack wheel assembly, which determines the magnitude of the current value applied to the piezo block.

The control cylinder may include a drive cylinder and a drawing member drawn out from the drive cylinder or drawn into the drive cylinder, and the drive cylinder may be coupled to a lower surface of the connection body.

The first vertical shaft includes a coupling portion provided at an upper end, and a first shaft body extending downward from the coupling portion, and the coupling portion may be hollow so that an upper surface thereof is open and may have a cylindrical coupling insertion hole. .

The first shaft body may be formed in a cylindrical shape to have a predetermined length along a direction perpendicular to the ground, the coupling part is formed by extending the outer diameter of the upper end of the first vertical shaft in the horizontal direction, and the diameter of the coupling insert Is formed larger than the outer diameter of the withdrawing member, the lower end of the withdrawing member may be inserted into the coupling insertion hole.

The shock absorber shaft further includes a connection cover having a larger outer diameter than the outer diameters of the first shaft body and the second shaft body, the connection cover is hollow, and the inside of the connection cover is in a direction perpendicular to the ground A cylindrical second guide space having a predetermined length may be formed.

The lower end of the first shaft body is inserted into the upper end of the connecting cover part, the upper end of the second shaft body is inserted into the lower end of the connecting cover part, and the first vertical shaft and the second vertical shaft are formed along the longitudinal direction. It can move relatively with respect to the connection cover part.

The first vertical shaft may further include a load detection unit that is supported in contact with an upper end of the second buffer member and detects a applied load transmitted as the second vertical shaft moves upward through the second buffer member.

The load detection unit may be provided at a lower end of the first shaft body, a lower surface of the load detection unit forms a part of the lower surface of the first shaft body, and the load detection unit is disposed to face an upper surface of the second shaft body. It can be.

The magnitude of the applied load detected by the load detection unit is transmitted to the control unit, and the control unit determines whether or not to apply current to the piezo block and/or the current value applied to the piezo block based on the magnitude of the load detected by the load detection unit. size can be determined.

According to the embodiments of the present disclosure, the tongue jack wheel can be directly coupled to the support frame of the trailer without installing an inertia brake.

In addition, according to the embodiments of the present disclosure, the amount of impact transmitted through the support wheel during driving of the vehicle connected to the trailer is buffered, so that the durability of the mounting bracket is further improved and the connection between the tongue jack wheel and the support frame is damaged. safety issues can be avoided.

In addition, according to the embodiments of the present disclosure, the buffer strength of the mounting bracket is adjusted in association with the driving speed of the vehicle and the magnitude of the impact load transmitted through the tongue jack wheel, so that the buffer performance is optimized and applied according to the driving environment. can

In addition, according to embodiments of the present disclosure, durability and corrosion resistance of the buffer member provided in the mounting bracket may be improved.

BRIEF DESCRIPTION OF THE DRAWINGS Included as part of the detailed description to aid understanding of the embodiments, the accompanying drawings provide various embodiments and, together with the detailed description, describe technical features of the various embodiments.
1 is a view schematically showing a trailer having a tongue jack wheel mounting bracket according to an embodiment of the present disclosure;
2 is a view schematically showing a tongue jack wheel mounting bracket of a trailer according to an embodiment of the present disclosure;
3 is a view showing a longitudinal cross-section of the Tungjaeng wheel mounting bracket shown in FIG.
4 is a view schematically showing a tongue jack wheel mounting bracket and a tongue jack wheel assembly including the same according to another embodiment of the present disclosure;
5 is a view schematically showing a longitudinal section of a mounting bracket of the tongue jack wheel assembly shown in FIG. 4;
Figure 6 is a view schematically showing the operation of the mounting bracket shown in Figure 5
7 is a view schematically showing a longitudinal section of a part of the support shaft of the tongue jack wheel assembly shown in FIG. 4;
8 is a view schematically showing a ground portion of the tongue jack wheel assembly shown in FIG. 4;
Figure 9 is an exploded perspective view of the grounding unit shown in Figure 8;
10 is a view showing an example of the operation of the grounding unit shown in FIG. 8;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented to sufficiently convey the spirit of the present invention to those skilled in the art. The present invention may be embodied in other forms without being limited to only the embodiments presented herein. In the drawings, in order to clarify the present invention, illustration of parts irrelevant to the description may be omitted, and the size of components may be slightly exaggerated to aid understanding.

The embodiments described in this specification and the configurations shown in the drawings are only one preferred example of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings in this specification at the time of filing of the present application.

The same reference numerals or numerals presented in each drawing in this specification indicate parts or components that perform substantially the same function. The shapes and sizes of elements in the drawings may be exaggerated for clarity.

Terms used in this specification are used to describe the embodiments, and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “include” or “have” are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It does not preclude in advance the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Terms including ordinal numbers such as “first” and “second” used herein may be used to describe various components, but the components are not limited by the terms, and the terms are one It is used only for the purpose of distinguishing a component from other components. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term “and/or” includes any combination of a plurality of related recited items or any one of a plurality of related recited items.

The terms "upper", "lower", "upper", "lower", etc. used below are defined based on the drawings, and the shape and location of each component are not limited by these terms.

Like reference numbers designate like elements throughout the specification. This specification does not describe all elements of the embodiments, and general content or overlapping content between the embodiments in the technical field to which the present invention pertains will be omitted.

The term 'unit, module, device' used in the specification may be implemented as software or hardware, and according to embodiments, a plurality of 'units, modules, devices' may be implemented as a single component, or a single 'unit, It is also possible that the 'module, device' includes a plurality of components.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case of being directly connected but also the case of being indirectly connected, and indirect connection includes being connected through a wireless communication network. do.

In addition, when a certain component is said to "include", this means that it may further include other components without excluding other components unless otherwise stated.

Terms such as first and second are used to distinguish one component from another, and the components are not limited by the aforementioned terms.

Expressions in the singular number include plural expressions unless the context clearly dictates otherwise.

In each step, the identification code is used for convenience of description, and the identification code does not explain the order of each step, and each step may be performed in a different order from the specified order unless a specific order is clearly described in context. there is.

1 is a diagram schematically showing a trailer 2 having a tongue jack wheel mounting bracket 1 according to an embodiment of the present disclosure, and FIG. 2 is a tongue jack wheel of a trailer 2 according to an embodiment of the present disclosure. It is a schematic view of the mounting bracket 1, and FIG. 3 is a view showing a longitudinal section of the Tungjaeng wheel mounting bracket 1 shown in FIG.

1 to 3, the tongue jack wheel mounting bracket 1 according to an embodiment of the present disclosure is attached to the support frame 21 of the trailer 2 for connecting the vehicle 3 and the trailer 2. It may include a coupling body portion 11 that is directly coupled, and a connection body portion 13 provided below the coupling body portion 11 and connecting the tongue jack wheel to the coupling body portion 11.

An upper end of the support shaft of the tongue jack wheel may be coupled to a lower portion of the connection body 13 . The coupling body portion 11 may include a pair of coupling plates 12 that are directly contact-coupled to both sides of the support frame 21 of the trailer 2 . The support frame 21 may be formed in a hollow rectangular frame, and the coupling plate 12 may be formed in a flat plate shape. A pair of coupling plates 12 may be disposed perpendicular to the ground.

The connecting body portion 13 is formed by extending downward from the lower surface of the connecting plate 14 connecting the lower end of the pair of coupling plates 12 between the pair of coupling plates 12, and the coupling plate 14. A fastening plate 15 may be included. The connection plate 14 may be formed in a flat plate shape and may be disposed parallel to the ground. The fastening plate 15 may be formed in a flat plate shape and may be disposed perpendicular to the ground at the center of the connecting plate 14 .

An upper end of the support shaft of the tongue jack wheel may be coupled to the fastening plate 15 .

A first coupling hole 12a into which a coupling member for coupling the coupling plate 12 and the support frame 21 to each other is inserted may be formed through each of the pair of coupling plates 12 . A second fastening groove into which a fastening member for coupling between the fastening plate 15 and the support shaft of the tongue jack wheel is inserted may be formed through the fastening plate 15 . The first fastening holes 12a may be provided in plurality in each coupling plate 12 and spaced apart in the horizontal direction, and the second fastening holes 15a may be provided in plurality in the fastening plate 15 and move horizontally. may be spaced apart.

At least one of the coupling plate 12 and the connection plate 14 is preferably formed to have a thickness of 3 mm to 5 mm, and may be more preferably formed to have a thickness of about 4 mm.

4 is a view schematically showing a tongue jack wheel mounting bracket 10 and a tongue jack wheel assembly including the same according to another embodiment of the present disclosure, and FIG. 5 is a mounting bracket of the tongue jack wheel assembly 1000 shown in FIG. 4 ( 10) schematically showing the longitudinal section, and FIG. 6 is a view schematically showing the operation of the mounting bracket 10 shown in FIG.

6(a) is a view showing a state in which current is not applied to the piezo block 140 of the coupling body 100, and FIG. 6(b) shows the piezo block 140 of the coupling body 100 It is a diagram showing the state in which current is applied to.

4, 5 and 6, the tongue jack wheel mounting bracket 10 according to another embodiment of the present disclosure is a support frame of the trailer 2 for connecting the vehicle 3 and the trailer 2 ( 21), and a coupling body portion 200 provided below the coupling body portion 100 and connecting the tongue jack wheel 300 to the coupling body portion 100. can An upper end of the support shaft 310 of the tongue jack wheel 300 may be coupled to a lower portion of the connection body 200 .

The tongue jack wheel assembly 1000 including the tongue jack wheel mounting bracket 10 according to another embodiment of the present disclosure may further include a tongue jack wheel 300 coupled to the mounting bracket 10.

The tongue jack wheel 300 may include a support shaft 310 formed to have a predetermined length in a direction perpendicular to the ground, and a support wheel 320 rotatably coupled to the lower end of the support shaft 310 and capable of contacting the ground. can The support wheel 320 may be configured to support the front of the trailer 2 on the ground while the vehicle 3 is running, and prevent the front of the trailer 2 from tilting.

The support shaft 310 may include an adjustment cylinder 311 driven to adjust the length of the support shaft 310 . As the length of the support shaft 310 is adjusted by the control lever, the height of the support wheel 320 separated from the ground may be adjusted.

The coupling body portion 100 may include a pair of coupling support blocks 110, a pair of lift guides 120, a pair of first buffer members 130, and a pair of piezo blocks 140. can

The pair of coupling support blocks 110 may be contact-coupled to both sides of the support frame 21 of the trailer 2, and each may be formed in a hollow rectangular parallelepiped shape with lower surfaces open. As the coupling support block 110 is hollow, a first guide space 110a may be provided in each coupling support block 110 in a direction perpendicular to the ground.

The pair of elevating guides 120 may be coupled to open lower portions of the pair of coupling support blocks 110, respectively, and may be provided to move vertically within the coupling support block 110. Preferably, each elevating guide 120 may be elevated in a direction perpendicular to the ground along the first guide space 110a.

Each of the pair of first shock absorbing members 130 may be disposed between the closed upper surface of each of the pair of coupling support blocks 110 and between each of the pair of lift guides 120, and are configured to have elastic restoring force. It can be. That is, the first buffer member 130 may be compressed in a direction perpendicular to the ground, and may provide elastic restoring force in an oppositely extended direction.

The connection body part 200 may be composed of a connection plate coupled to the lower surface of the pair of elevating guides 120 and disposed parallel to the ground. That is, the connection body 200 may move up and down integrally as the pair of lift guides 120 move up and down along the first guide space 110a.

On the other hand, the pair of elevating guides 120 and the connection plate may be supported downwardly by the first shock absorbing member 130 . Therefore, when the support wheel 320 comes into contact with the ground and moves upward due to interference due to a change in the road surface or a downward tilt of the front of the trailer 2, the elevating guide 120 and the connection plate are the first shock absorbing member It can move upward while compressing the 130, the first shock absorbing member 130 is compressed, and the impact caused by contact with the ground transmitted from the support wheel 320 can be cushioned.

The coupling support block 110 may be formed in a rectangular parallelepiped shape, and the support frame 21 may be formed in a hollow rectangular frame.

Each coupling support block 110 may include coupling plates 111 that are directly contact-coupled to both side surfaces of the support frame 21 of the trailer 2, respectively. Coupling plate 111 may be located on a sidewall in contact with the support frame 21 among four sidewalls vertically disposed on the ground of the coupling support block 110 . The coupling plate 111 may be formed in a flat plate shape. A pair of coupling plates 111 may be disposed perpendicular to the ground.

The support frame 21 and the coupling plate 111 may be coupled by a plurality of first fastening members 4, and the plurality of first fastening members 4 may be spaced apart from each other in a direction parallel to the ground. there is. The first fastening member 4 may be a rivet or bolt.

In each coupling support block 110, a first guide groove 110b formed by being recessed is provided on the inner surface of a pair of sidewalls facing each other among four sidewalls disposed perpendicular to the ground of the coupling support block 110 It can be. Preferably, the first guide groove 110b may be provided on the inner surface of all four side walls disposed perpendicular to the ground of the coupling support block 110 . In the cross section of the coupling support block 110, the first guide groove 110b may be formed in a square shape.

The first guide groove 110b may extend along a direction perpendicular to the ground. Meanwhile, the lower end of the first guide groove 110b may be closed. That is, in the cross section of the coupling support block 110, the area of the square area formed by the first guide grooves 110b on the four side walls may be wider than the area of the open lower surface of the coupling support block 110. there is.

In addition, a first protruding member 121 protruding outward in a horizontal direction may be provided at an upper end of each of the pair of elevating guides 120 . The elevation guide 120 may be formed in a hexahedral shape, and the first protruding member 121 may be formed by horizontally and vertically extending horizontal and vertical widths of an upper end of the elevation guide 120 . The first protruding member 121 may be positioned by being inserted into the first guide groove 110b of the coupling support block 110, and may be configured to move up and down along the first guide groove 110b.

That is, when the elevation guide 120 is elevated, the first protruding member 121 may move up and down in a direction perpendicular to the ground within the first guide groove 110b. On the other hand, since the lower end of the first guide groove 110b is closed, the elevating guide 120 is a coupling support block ( 110) may not be separated.

Each of the pair of piezoblocks 140 described above may be disposed at an inner upper end of the pair of coupling support blocks 110, respectively. Preferably, each piezo block 140 may be disposed under the closed upper surface of the coupling support block 110, and the upper surface of the piezo block 140 may be supported on the closed upper surface of the coupling support block 110. . In addition, the upper end of the first buffer member 130 may be supported in contact with the lower surface of each of the pair of piezoblocks 140 .

Each of the pair of piezoblocks 140 may be configured to receive current from the outside, and may be configured to have a length in a direction perpendicular to the ground depending on the magnitude of the applied current. The piezo block 140 may be formed by stacking a plurality of piezo elements in the longitudinal direction of the coupling support block 110 (that is, in a direction perpendicular to the ground).

Preferably, when a current is applied to the piezoblock 140, the volume or volume of the piezoblock in a direction perpendicular to the ground may be changed according to the magnitude of the applied current. Conversely, when the current application to the piezo block 140 is released, the volume or volume of the piezo block 140 may be reduced again. In the first buffer member 130, the magnitude of the buffering force for pressing the elevating guide 120 may change according to the change in the length of the piezo block 140 in the direction perpendicular to the ground.

The mounting bracket 10 may further include a controller (not shown) that acquires driving speed information of the vehicle 3 to which the trailer 2 is connected. The control unit may be connected to a vehicle system controller (not shown) provided in the vehicle 3 to which the trailer 2 is connected to transmit/receive data, and may obtain driving speed information of the vehicle 3 from the vehicle system controller.

In addition, the control unit of the mounting bracket 10 determines whether or not to apply current to the piezo block 140 and/or the size of the current value applied to the piezo block 140 based on the acquired driving speed information of the vehicle 3. can The vehicle system control unit may be a vehicle integrated control unit provided in the vehicle 3 to detect and calculate vehicle fuel information, vehicle speed information, and vehicle condition information, or may be a Vehicle Stability Management (VSM) system.

The support shaft 310 may further include a horizontal frame 315 provided at a lower end of the support shaft 310 and extending in a direction parallel to the ground.

The horizontal frame 315 includes a wheel frame 3151 extending from the lower end of the support shaft 310 to one side in the horizontal direction, and a horizontal support block 3152 extending from the lower end of the support shaft 310 to the other side in the horizontal direction. can do. The wheel frames 3151 may be configured as a pair facing each other, and a support wheel 320 may be rotatably coupled between the pair of wheel frames 3151 .

FIG. 7 is a view schematically showing a longitudinal section of a part of the support shaft 310 of the tongue jack wheel assembly 1000 shown in FIG. 4 .

4 and 7, the support shaft 310 includes a first vertical shaft 312 coupled to the lower end of the adjusting cylinder 311 and a second vertical shaft connected to the lower end of the first vertical shaft 312. 314, and a buffer shaft unit 313 connecting the first vertical shaft 312 and the second vertical shaft 314 may be further included. A horizontal frame 315 may be coupled to the lower end of the second vertical shaft 314 .

The first vertical shaft 312 may be formed to have a predetermined length in a direction perpendicular to the ground, and the second vertical shaft 314 may be formed to have a predetermined length in a direction perpendicular to the ground. The first vertical shaft 312 may be located above the second vertical shaft 314, and the first vertical shaft 312 and the second vertical shaft 314 may be interconnected through a buffer shaft unit 313. there is.

The control cylinder 311 may include a driving cylinder 311a and a drawing member 311b. The drive cylinder 311a may be coupled to the lower surface of the connection body 200 . The drive cylinder 311a may be configured as a hydraulic cylinder.

The withdrawing member 311b may be formed to have a predetermined length along the longitudinal direction of the first vertical shaft 312 . The withdrawing member 311b may be drawn downward from the lower part of the driving cylinder 311a or drawn into the lower part of the driving cylinder 311a by the operation of the driving cylinder 311a. The lower end of the withdrawing member 311b may be coupled to the upper end of the first vertical shaft 312 .

The first vertical shaft 312 may include a coupling portion 3121 provided at an upper end, and a first shaft body 3122 extending downward from the coupling portion 3121 . The coupling part 3121 may be hollow so that its upper surface is open, and may have a cylindrical coupling insertion hole 3121a through it.

The first shaft body 3122 may be formed in a cylindrical shape to have a predetermined length along a direction perpendicular to the ground, and the coupling portion 3121 is formed by extending the outer diameter of the upper end of the first vertical shaft 312 in the horizontal direction It can be.

The diameter of the coupling insertion hole 3121a may be larger than the outer diameter of the withdrawal member 311b, and the lower end of the withdrawal member 311b may be inserted into the coupling insertion hole 3121a. The withdrawing member 311b and the coupling part 3121 may be mutually coupled by the second fastening member 5 fastened in the horizontal direction.

The second vertical shaft 314 may include a second shaft body 3141 formed in a cylindrical shape to have the same outer diameter as the first shaft body 3122 .

A second buffer member 3132 for elastically supporting the first vertical shaft 312 and the second vertical shaft 314 along the longitudinal direction of the support shaft 310 may be provided in the buffer shaft unit 313. .

The buffer shaft part 313 may further include a connection cover part 3131 having an outer diameter larger than the outer diameters of the first shaft body 3122 and the second shaft body 3141 . The connection cover part 3131 may be hollow, and a cylindrical second guide space 3131b having a predetermined length in a direction perpendicular to the ground may be formed therein.

The diameter of the second guide space 3131b (that is, the inner diameter of the connection cover part 3131) may be larger than the outer diameters of the first shaft body 3122 and the second shaft body 3141. The lower end of the first shaft body 3122 may be inserted into the upper end of the connection cover part 3131, and the upper end of the second shaft body 3141 may be inserted into the lower end of the connection cover part 3131. The first vertical shaft 312 and the second vertical shaft 314 may be relatively movable with respect to the connection cover part 3131 along the longitudinal direction.

The second buffer member 3132 may be disposed in the second guide space 3131b of the connection cover part 3131, and is in contact with the lower surface of the first support shaft 310 and the upper surface of the second support shaft 310. can be supported elastically.

A second guide groove 3131a formed by being recessed may be provided on an inner circumferential surface of the connection cover part 3131 . In the cross section of the connection cover part 3131, the second guide groove 3131a may be formed in a circular shape.

The second guide groove 3131a may extend along a direction perpendicular to the ground. Meanwhile, upper and lower ends of the second guide groove 3131a may be closed. That is, in the cross section of the connection cover part 3131, the area of the circular area formed by the second guide groove 3131a may be larger than the open upper and lower surfaces of the connection cover part 3131.

In addition, a first protruding guide 3122a protruding outward in a horizontal direction may be provided at a lower end of the first shaft body 3122 . The first protruding guide 3122a may be formed in a disk shape, and the first protruding guide 3122a may be formed such that the diameter of the lower end of the first shaft body 3122 extends in a horizontal direction. The first protruding guide 3122a may be positioned by being inserted into the second guide groove 3131a, and may be configured to move up and down along the second guide groove 3131a.

In addition, a second protruding guide 3141a protruding outward in a horizontal direction may be provided at an upper end of the second shaft body 3141 . The second protruding guide 3141a may be formed in a disk shape, and the second protruding guide 3141a may be formed by extending the diameter of the upper end of the second shaft body 3141 in a horizontal direction. The second protruding guide 3141a may be positioned by being inserted into the second guide groove 3131a, and may be configured to move up and down along the second guide groove 3131a.

The first protruding guide 3122a may be positioned at an upper end of the second guide groove 3131a, and the second protruding guide 3141a may be positioned at a lower end of the second guide groove 3131a. In addition, since the upper and lower ends of the second guide groove 3131a are closed, the first vertical shaft 312 is formed by interference between the closed upper surfaces of the first protruding guide 3122a and the second guide groove 3131a. It may not be separated from the connection cover part 3131, and the second vertical shaft 314 is connected to the connection cover part 3131 by interference between the closed surfaces of the second protruding guide 3141a and the second guide groove 3131a. ) may not be separated from

The first vertical shaft 312 may be elastically supported by being pressed toward the upper side of the connection cover 3131 by the second buffer member 3132, and the second vertical shaft 314 is attached to the second buffer member 3132. It may be pressed to the lower side of the connection cover part 3131 and elastically supported by it.

The first vertical shaft 312 is supported in contact with the upper end of the second buffer member 3132, and the second vertical shaft 314 is moved upward through the second buffer member 3132 to detect a applied load transmitted through a load detection unit. (3123) may be further included. The load detection unit 3123 may be provided at the lower end of the first shaft body 3122, and the lower surface of the load detection unit 3123 may form a part of the lower surface of the first shaft body 3122. The load detection unit 3123 may be disposed to face the upper surface of the second shaft body 3141 .

The applied load size detected by the load detection unit 3123 may be transmitted to the control unit of the mounting bracket 10 . The control unit may determine whether to apply current to the piezo block 140 and/or determine the size of the current value applied to the piezo block 140 based on the magnitude of the load detected by the load detection unit 3123 .

Preferably, the control unit determines whether or not to apply current to the piezo block 140 and/or applies the current to the piezo block 140 based on the magnitude of the load detected by the load detection unit 3123 and the acquired traveling speed information of the vehicle 3. The size of the current value can be determined.

For example, when the traveling speed of the vehicle 3 is less than a preset reference speed, the controller may not apply current to the piezo block 140 . Meanwhile, when the magnitude of the applied load detected by the load detection unit 3123 is greater than or equal to a predetermined reference load, the controller may not apply current to the piezo block 140 . Through this, the damping force of the first buffer member 130 relative to the elevation guide 120 can be applied relatively softly.

In addition, when the driving speed of the vehicle 3 is equal to or greater than the predetermined reference speed, the control unit may apply current to the piezoblock 140, and the magnitude of the applied current at this time will be proportional to the magnitude of the traveling speed of the vehicle 3. can When the magnitude of the applied load detected by the load detection unit 3123 is less than the predetermined reference load, the controller may apply a current to the piezo block 140, and the magnitude of the applied current is inversely proportional to the magnitude of the detected applied load. can Through this, the damping force of the first shock absorbing member 130 with respect to the elevation guide 120 can be applied relatively hard.

As described above, the damping force of the first buffer member 130 is adjusted according to the driving speed of the vehicle 3 and / or the magnitude of the upward pressure load transmitted from the ground through the support wheel 320, the support frame ( 21) and the mounting bracket 10, and transmission of excessive vibration to the trailer 2 can be prevented.

Meanwhile, at least one of the first buffer member 130 and the second buffer member 3132 is nickel (Ni), copper (Cu), carbon (C), silicon (Si), niobium (Nb), boron ( B), manganese (Mn), aluminum (Al), chromium (Cr), and vanadium (V).

Preferably, at least one of the first buffer member 130 and the second buffer member 3132 contains 0.3 to 0.5 wt% of nickel (Ni), 0.25 to 0.35 wt% of copper (Cu), and 0.5 to 0.55 wt% of carbon (C). wt%, Silicon (Si) 1.4~1.7wt%, Niobium (Nb) 0.01~0.04wt%, Boron (B) 0.0005~0.0025wt%, Manganese (Mn) 0.55~0.75wt%, Aluminum (Al) 0.02~ It may be formed of a composition containing 0.06wt%, chromium (Cr) 0.6-0.8wt%, vanadium (V) 0.05-0.10wt%, and the balance of iron (Fe) and unavoidable impurities.

More preferably, at least one of the first buffer member 130 and the second buffer member 3132 includes nickel (Ni) 0.4wt%, copper (Cu) 0.3wt%, carbon (C) 0.53wt%, silicon ( Si) 1.5wt%, Niobium (Nb) 0.03wt%, Boron (B) 0.0015wt%, Manganese (Mn) 0.6wt%, Aluminum (Al) 0.04wt%, Chromium (Cr) 0.7wt%, Vanadium (V ) 0.08wt% and the balance of iron (Fe) and unavoidable impurities.

At least one of the above-described first buffer member 130 and second buffer member 3132 may further include 0.017 wt% or less of phosphorus (P) and 0.01 wt% or less of sulfur (S).

Carbon (C) can increase the strength and hardness of materials. When the amount of carbon (C) is less than 0.5% by weight, the strength of the composition may decrease rapidly, and when the amount of carbon (C) exceeds 0.55% by weight, the toughness of the composition may decrease. Carbon (C) is preferably 0.5 to 0.55 wt% based on the total weight of the composition.

Silicon (Si) can increase the hardness of the composition. When silicon (Si) is less than 1.4wt%, the composition cannot secure sufficient hardness, etc., and when silicon (Si) is greater than 1.7wt%, toughness and the like of the composition may be lowered. Silicon (Si) is preferably 1.4 ~ 1.7wt% with respect to the total weight of the composition.

Nickel (Ni) can improve the corrosion resistance of the composition. If nickel (Ni) is less than 0.3wt%, it may be difficult to secure sufficient stone resistance, etc., and if nickel (Ni) is more than 0.5wt%, the increase in manufacturing cost is greater than the increase in corrosion resistance, resulting in a decrease in economic feasibility. can Nickel (Ni) is preferably 0.3 to 0.5 wt% based on the total weight of the composition.

Niobium (Nb) can improve the toughness of the composition and delay the corrosion rate by miniaturizing the crystal grains. If niobium (Nb) is less than 0.01wt%, sufficient toughness improvement and corrosion rate retardation effect cannot be obtained, and if niobium (Nb) is more than 0.04wt%, cost increases compared to the effect obtained, resulting in reduced economic efficiency. It can be. Niobium (Nb) is preferably 0.01 to 0.04 wt% based on the total weight of the composition.

Copper (Cu) may improve corrosion resistance of the composition. If copper (Cu) is less than 0.25wt%, it may be difficult to secure sufficient corrosion resistance, etc., and if copper (Cu) is more than 0.35wt%, red heat brittleness may occur. Copper (Cu) is preferably 0.25 to 0.35 wt% based on the weight of the total composition.

Boron (B) can retard corrosion through grain boundary reinforcement. If boron (B) is less than 0.0005wt%, a satisfactory corrosion retardation effect cannot be obtained, and if boron (B) is more than 0.0025wt%, boron compounds such as Fe ₂₃ (CB) ₆ are generated and boron (B) The content of is reduced, and the boron compound becomes the starting point of fatigue failure, and the strength of the composition may be reduced. Boron (B) is preferably 0.0005 to 0.0025 wt% based on the weight of the total composition.

Manganese (Mn) can enhance the strength of the composition. If the content of manganese (Mn) is less than 0.55wt%, the effect of improving the strength of the composition may not be sufficient, and if it is more than 0.75wt%, the strength may be lowered due to formation in the composition. Manganese (Mn) is preferably 0.55 to 0.75 wt% based on the total weight of the composition.

Chromium (Cr) can improve the oxidation resistance of the composition. When the amount of chromium (Cr) is less than 0.6 wt%, it may be difficult to improve oxidation resistance, and when it is greater than 0.8 wt%, the brittleness of the composition may increase. Chromium (Cr) is preferably 0.6 to 0.8 wt% based on the total weight of the composition.

Vanadium (V) can improve the toughness and recovery properties of the composition. If vanadium (V) is less than 0.05wt%, it may be difficult to secure sufficient toughness and resilience of the composition, and if it is more than 0.10wt%, vanadium (V) carbide may be formed to reduce the strength of the composition. Vanadium (V) is preferably 0.05 to 0.10 wt% based on the weight of the total composition.

Aluminum (Al) may be added as a deoxidizer. When aluminum (Al) is less than 0.02wt%, the function as a deoxidizer may be weak, and when it is greater than 0.06wt%, the strength of the composition may be reduced. Aluminum (Al) may be preferably 0.02 to 0.06 wt% based on the total weight of the composition.

As at least one of the first buffer member 130 and the second buffer member 3132 is formed of the above-described composition, the strength and toughness of the first buffer member 130 and/or the second buffer member 3132 can be improved. can Through this, scratches on the surface of the buffer member caused by sand or the like can be suppressed.

In addition, corrosion resistance of the first buffer member 130 and/or the second buffer member 3132 may be improved, and thus corrosion of the buffer member exposed by scratches on the surface of the buffer member may be suppressed.

FIG. 8 is a schematic view of the grounding part 330 of the tongue jack wheel assembly 1000 shown in FIG. 4 , and FIG. 9 is an exploded perspective view of the grounding part 330 shown in FIG. 8 .

Referring to FIGS. 8 and 9 , the tongue jack wheel 300 may further include a grounding portion 330 provided on the horizontal support block 3152 . The grounding unit 330 may include a seating plate 333 configured to be movable in a direction perpendicular to the ground. As the seating plate 333 moves downward, it may come into surface contact with the ground to provide ground friction to the tongue jack wheel 300 .

The grounding unit 330 may further include a vertical bar 331 disposed perpendicular to the ground and formed in an elongated shape, and a horizontal bar 332 disposed parallel to the ground and formed in an elongated shape. The seating plate 333 may be integrally coupled to the lower end of the vertical bar 331, and the seating plate 333 and the vertical bar 331 may move up and down together.

In addition, the horizontal support block 3152 has a vertical bar 331 insertion groove 3152a into which the vertical bar 331 is inserted, and a horizontal bar 332 insertion groove 3152b into which the horizontal bar 332 is inserted. this can be provided. The vertical rod 331 insertion groove 3152a may be provided through the horizontal support block 3152 in a direction perpendicular to the ground, and the horizontal rod 332 insertion groove 3152b supports the horizontal support block 3152. It may be provided through in a direction parallel to the axis of rotation of the wheel 320 .

The vertical bar 331 and the horizontal bar 332 may be arranged to be orthogonal to each other. The horizontal bar 332 may be provided with a bar through-hole 3327 penetrating in a direction perpendicular to the ground, and the vertical bar 331 may be inserted into the bar through-hole 3327 and positioned. That is, the vertical bar 331 may be disposed through the horizontal bar 332 .

The bar through-hole 3327 may be formed in a long hole structure extending along the longitudinal direction of the horizontal bar 332 . That is, the horizontal rod 332 may be relatively horizontally moved along the longitudinal direction of the horizontal rod 332 with respect to the vertical rod 331 inserted into the rod through-hole 3327.

A locking support block 3311 may be formed at an upper end of the vertical bar 331 . In a plane parallel to the ground, the holding block 3311 may be formed to have a larger cross-sectional area than the vertical bar 331 . A first elastic member 3313 may be disposed between the lower surface of the locking support block 3311 and the upper surface of the horizontal support block 3152 . The first elastic member 3313 may provide elastic force so as to press and support the locking support block 3311 upward from the horizontal support block 3152 . Through this, the seating plate 333 may be moved upward toward the horizontal support block 3152 and positioned.

At the lower end of the vertical rod 331, a coupling protrusion 3314 provided to be coupled with the seating plate 333 may be formed. The coupling protrusion 3314 may be formed in a spiral shape, and a coupling groove having a shape complementary to the coupling protrusion 3314 may be formed at the center of the seating plate 333 .

A pair of first connecting shafts 3322 may protrude and extend at one end of the horizontal bar 332 in the longitudinal direction, and a first engaging plate 3321 is integrally formed at an end of the pair of first connecting shafts 3322. can be combined The first locking plate 3321 may be formed in a flat plate shape, and may be disposed so that a side surface perpendicular to the ground of the horizontal support block 3152 faces each other.

In addition, a pair of second connecting shafts 3324 may protrude and extend at the other end of the horizontal bar 332 in the longitudinal direction, and a second locking plate 3323 may be provided at an end of the pair of second connecting shafts 3324. can be combined integrally. The second locking plate 3323 may be formed in a flat plate shape, and may be disposed so that the side surface perpendicular to the ground of the horizontal support block 3152 faces. The first locking plate 3321 and the second locking plate 3323 may be disposed parallel to each other.

In addition, a second elastic member 3325 having an elastic restoring force may be disposed on each second connecting shaft 3324 . The second elastic member 3325 may be supported in contact with an outer surface perpendicular to the ground of the horizontal support block 3152 at one end, and may be supported in contact with an inner surface of the second locking plate 3323 at the other end. That is, the second elastic member 3325 may provide an elastic force so as to press and support the second locking plate 3323 outward from the horizontal support block 3152 .

When the horizontal bar 332 is pressed and supported in one longitudinal direction by the second elastic member 3325, the second locking plate 3323 located at the other end of the horizontal bar 332 is outside the horizontal support block 3152. It can be pressed to the side and supported in contact.

On the other hand, each of the first connecting shaft 3322 and the first engaging plate 3321 may be fastened by a bolt member 3326, and each of the second connecting shaft 3324 and the second engaging plate 3323 are It may be fastened by a bolt member 3326.

An upper outer circumferential surface of the vertical rod 331 may be provided with a locking groove 3312 formed by being recessed. At least a part of the inner circumferential surface of the through hole of the horizontal bar 332 may be inserted into the locking groove 3312 and supported in contact therewith. When the inner circumferential surface of the through hole of the horizontal bar 332 is inserted into the locking groove 3312, the vertical movement of the vertical bar 331 may be limited by interference with the horizontal bar 332.

FIG. 10 is a diagram showing an example of operation of the grounding unit 330 shown in FIG. 8 . 10(a) is a view showing a state in which the seating plate 333 is positioned in a state of being moved upward (hereinafter referred to as a ground release position), and FIG. 10(b) shows the seating plate 333 moving downward. It is a drawing showing a fixed state (hereinafter referred to as a ground fixing position).

Referring to (a) of FIG. 10, in the ground release position, the vertical rod 331 moves upward from the horizontal support block 3152 as the locking support block 3311 is pressed upward by the first elastic member 3313. It may be moved and positioned, and the seating plate 333 may also be moved upward at the same time as the vertical bar 331 and positioned away from the ground. At this time, the inner circumferential surface of the through hole of the horizontal bar 332 may be positioned in contact with the outer circumferential surface of the lower side of the locking groove 3312 of the outer circumferential surface of the vertical bar 331 .

The user presses the second locking plate 3323 to compress the second elastic member 3325 and presses it toward the horizontal support block 3152, and at the same time presses the locking support block 3311 to compress the first elastic member 3313 When pressing downward, the vertical bar 331 and the seating plate 333 may be moved downward. Through this, the ground unit 330 may be switched from a ground release position to a ground fixed position.

Referring to (b) of FIG. 10 , in the ground fixing position, one side of the inner circumferential surface of the through-hole of the horizontal rod 332 may be inserted into the locking groove 3312 of the vertical rod 331 and positioned. At this time, the horizontal rod 332 inserted into the locking groove 3312 may be supported by a second elastic member 3325 to one side in the horizontal direction, and vertically through the inner circumferential surface of the through-hole in contact with the locking groove 3312. The bar 331 may be supported by pressing one side in the horizontal direction.

That is, in a state in which the horizontal bar 332 is inserted into the locking groove 3312 of the vertical bar 331, the vertical bar 331 is pressed and supported in the horizontal direction by the horizontal bar 332, the vertical bar 331 and the horizontal bar 332 may be contacted and interfered with each other along a direction perpendicular to the ground, and vertical movement of the vertical bar 331 may be restricted.

The seat plate 333 moved downward from the ground fixing position can be grounded to the ground, and the support wheel 320 can be prevented from shaking or moving on the ground due to the contact friction force between the ground and the seat plate 333. can

Meanwhile, a plurality of ground protrusions 333a may be provided on the lower surface of the seating plate 333 . The ground protrusion 333a may protrude downward from the lower surface of the seating plate 333 and provide improved ground friction between the seating plate 333 and the ground when the seating plate 333 is in contact with the ground. there is.

Through this, slipping between the bottom surface and the seating plate 333 can be prevented, and the position of the support wheel 320 in front of the trailer 2 can be stably fixed.

Although the present disclosure has been described in detail through representative embodiments in the above, those skilled in the art to which the present disclosure pertains can make various modifications to the above-described embodiments without departing from the scope of the present disclosure. will understand Therefore, the scope of rights of the present disclosure should not be limited to the described embodiments and should not be defined, and should be defined by not only the claims to be described later, but also those equivalent to these claims.

1000: tongue jack wheel assembly
1, 10: mounting bracket
11: coupling body
12: coupling plate
12a: first fastening hole
13: connection body
14: connection plate
15: fastening plate
15a: second fastening hole
100: coupling body
110: coupling support block
110a: first guide space
110b: first guide groove
111: coupling plate
120: lifting guide
121: first protruding member
130: first buffer member
140: piezo block
200: connection body
300: tongue jack wheel
310: support shaft
311: adjusting cylinder
311a: drive cylinder
311b: withdrawal member
312: first vertical shaft
3121: joint
3121a: coupling insert
3122: first shaft body
3122a: first protrusion guide
3123: load detection unit
313: buffer shaft unit
3131: connection cover
3131a: second guide groove
3131b: second guide space
3132: second buffer member
314: second vertical shaft
3141: second shaft body
3141a: second protruding guide
315: horizontal frame
3151: wheel frame
3152: horizontal support block
3152a: vertical rod insertion groove
3152b: horizontal rod insertion groove
320: support wheel
330: ground
331: vertical bar
3311: jamming support block
3312: catch groove
3313: first elastic member
3314: coupling protrusion
332: horizontal bar
3321: first locking plate
3322: first connecting shaft
3323: second holding plate
3324: second connecting shaft
3325: second elastic member
3326: bolt member
3327: bar through hole
333: seating plate
333a: ground protrusion
2: trailer
21: support frame
3: vehicle
4: first fastening member
5: second fastening member

Claims (10)

In the tongue jack wheel mounting bracket of the trailer connected to the vehicle and transported,
Coupling body portion directly coupled to the support frame of the trailer for connection between the vehicle and the trailer; and
A connection body portion provided below the coupling body portion and for connecting a tongue jack wheel to the coupling body portion
including,
The upper end of the support shaft of the tongue jack wheel is coupled to the lower part of the connection body,
The coupling body part,
A pair of coupling support blocks contact-coupled to both sides of the support frame of the trailer, formed in a hollow rectangular parallelepiped shape and having an open lower surface;
a pair of lift guides each coupled to an open lower portion of the pair of coupling support blocks and movable in a vertical direction within the coupling support block; and
A first buffer member disposed between the closed upper surface of each of the pair of coupling support blocks and each of the pair of lifting guides and having an elastic restoring force
including,
The connection body portion is composed of a connection plate coupled to the lower surface of the pair of lifting guides and disposed parallel to the ground,
The pair of elevating guides and the connecting plate are supported downwardly by the first buffer member, wherein the tongue jack wheel mounting bracket of the trailer.
delete delete The method of claim 1,
The coupling body part further includes a pair of piezo blocks respectively disposed on the inner upper ends of the pair of coupling support blocks,
The upper end of the first buffer member is contacted and supported on the lower surface of each of the pair of piezo blocks,
Each of the pair of piezoblocks is configured to receive current from the outside, and is configured to change in length in a direction perpendicular to the ground according to the magnitude of the applied current,
The mounting bracket of the first buffer member, wherein the magnitude of the supporting force for pressing the lifting guide changes according to the change in the length of the piezo block in a direction perpendicular to the ground.
The method of claim 4,
The mounting bracket further includes a control unit that obtains driving speed information of the vehicle to which the trailer is connected,
Wherein the control unit determines a magnitude of a current value applied to the piezo block based on the acquired driving speed information of the vehicle.
In the tongue jack wheel assembly comprising the mounting bracket according to claim 5 and a tongue jack wheel coupled to the mounting bracket,
The tongue jack wheel,
a support shaft formed to have a predetermined length in a direction perpendicular to the ground; and
A support wheel rotatably coupled to the lower end of the support shaft and groundable to the ground
including,
The tongue jack wheel assembly, wherein the support shaft includes an adjustment cylinder driven to adjust the length of the support shaft.
The method of claim 6,
The support shaft is
A first vertical shaft coupled to the lower end of the control cylinder;
a second vertical shaft connected to a lower end of the first vertical shaft; and
Buffer shaft unit connecting the first vertical shaft and the second vertical shaft
Including more,
The support wheel is coupled to the lower end of the second vertical shaft,
The tongue jack wheel assembly, wherein the buffer shaft unit is provided with a second buffer member for elastically supporting the first vertical shaft and the second vertical shaft along the longitudinal direction of the support shaft.
The method of claim 7,
The support shaft further includes a horizontal support block extending in a horizontal direction from the lower end of the second vertical shaft,
The tongue jack wheel further includes a grounding portion provided on the horizontal support block,
The grounding part includes a seating plate configured to be movable in a direction perpendicular to the ground,
The tongue jack wheel assembly, wherein the seating plate makes surface contact with the ground as it moves downward to provide ground friction to the tongue jack wheel.
In the tongue jack wheel assembly including a tongue jack wheel mounting bracket of a trailer connected to a vehicle and transported, and a tongue jack wheel coupled to the mounting bracket,
The mounting bracket is
Coupling body portion that is directly coupled to the support frame of the trailer; and
A connection body portion provided below the coupling body portion and for connecting a tongue jack wheel to the coupling body portion
including,
The upper end of the support shaft of the tongue jack wheel is coupled to the lower part of the connection body,
The tongue jack wheel,
The support shaft formed to have a predetermined length in a direction perpendicular to the ground; and
A support wheel rotatably coupled to the lower end of the support shaft and groundable to the ground
including,
The support shaft includes an adjustment cylinder driven to adjust the length of the support shaft,
The support shaft is
A first vertical shaft coupled to the lower end of the control cylinder;
a second vertical shaft connected to a lower end of the first vertical shaft; and
Buffer shaft unit connecting the first vertical shaft and the second vertical shaft
Including more,
The support wheel is coupled to the lower end of the second vertical shaft,
The buffer shaft unit is provided with a second buffer member for elastically supporting the first vertical shaft and the second vertical shaft along the longitudinal direction of the support shaft,
The support shaft further includes a horizontal support block extending in a horizontal direction from the lower end of the second vertical shaft,
The tongue jack wheel further includes a grounding portion provided on the horizontal support block,
The grounding part includes a seating plate configured to be movable in a direction perpendicular to the ground,
The tongue jack wheel assembly, wherein the seating plate makes surface contact with the ground as it moves downward to provide ground friction to the tongue jack wheel.
In the tongue jack wheel assembly including a tongue jack wheel mounting bracket of a trailer connected to a vehicle and transported, and a tongue jack wheel coupled to the mounting bracket,
The mounting bracket is
Coupling body portion that is directly coupled to the support frame of the trailer; and
A connection body portion provided below the coupling body portion and for connecting a tongue jack wheel to the coupling body portion
including,
The tongue jack wheel,
a support shaft formed to have a predetermined length in a direction perpendicular to the ground; and
A support wheel rotatably coupled to the lower end of the support shaft and groundable to the ground
including,
The coupling body part,
A pair of coupling support blocks contact-coupled to both sides of the support frame of the trailer, formed in a hollow rectangular parallelepiped shape and having an open lower surface;
a pair of lift guides each coupled to an open lower portion of the pair of coupling support blocks and movable in a vertical direction within the coupling support block; and
A first buffer member disposed between the closed upper surface of each of the pair of coupling support blocks and each of the pair of lifting guides and having an elastic restoring force
including,
The upper end of the support shaft of the tongue jack wheel is coupled to the lower part of the connection body,
The coupling body part further includes a pair of piezo blocks respectively disposed on the inner upper ends of the pair of coupling support blocks,
The upper end of the first buffer member is contacted and supported on the lower surface of each of the pair of piezo blocks,
Each of the pair of piezoblocks is configured to receive current from the outside, and is configured to change in length in a direction perpendicular to the ground according to the magnitude of the applied current,
In the first buffer member, the magnitude of the supporting force for pressing the elevating guide changes according to the change in the length of the piezo block in the direction perpendicular to the ground,
The mounting bracket further includes a control unit that obtains driving speed information of the vehicle to which the trailer is connected,
Wherein the control unit determines the magnitude of the current value applied to the piezo block based on the acquired driving speed information of the vehicle.

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