JP4430700B2 - Lorry - Google Patents

Description

  The present invention relates to a freight vehicle capable of loading and unloading cargo by dropping a loading platform substantially horizontally on the ground behind the vehicle body.

  There are freight cars of Patent Documents 1 to 3 as freight cars capable of loading and unloading cargo by dropping the loading platform substantially horizontally on the ground behind the vehicle body. The freight vehicles of Patent Documents 1 to 3 are fixed to the inclined frame that is tilted by being pivotally attached to the rear part of the vehicle body, the slide frame that slides along the inclined frame due to expansion and contraction of the hydraulic cylinder, the lower side of the front end of the loading platform, and the inclined frame. And a chain wound around the sheave at the rear end of the slide frame, and with the sliding of the slide frame due to the extension of the hydraulic cylinder, the chain is pulled by the chain, and the extension amount of the hydraulic cylinder The loading platform is moved rearward by a movement amount corresponding to about twice as much as the above, and the loading platform is lowered to the ground in a substantially horizontal state.

Japanese Patent No. 2532158 JP 2001-138793 A JP 2006-298025 A

  By the way, although the lorry of patent documents 1-3 realizes the movement of a cargo bed in a wide range by pulling the cargo bed with a chain wound around a sheave, the propulsive force that moves the cargo bed is the power of the hydraulic cylinder. There is a problem that the power of the hydraulic cylinder cannot be used efficiently.

  In addition, in order to obtain a propulsive force necessary for moving the loading platform, it is necessary to use a large hydraulic cylinder with large power, and it is also necessary to provide a complicated drive mechanism for arranging the chain. For this reason, there is a problem that the weight of the vehicle body increases and the fuel efficiency decreases, and the manufacturing cost becomes expensive.

  Further, in a drive mechanism using a chain, the chain grows due to an increase in usage frequency or a secular change. Therefore, it is necessary to perform maintenance work to check the elongation of the chain and replace it when it exceeds the allowable amount. For this reason, there is a problem that a great amount of labor is required for the maintenance work and the maintenance cost is expensive.

  The present invention is proposed in order to solve the above-mentioned problems, and it is possible to load and unload cargo by dropping the loading platform substantially horizontally on the ground and to efficiently use the power of the hydraulic cylinder. The purpose is to provide a lorry that can be used. Another object of the present invention is to provide a freight vehicle capable of reducing the manufacturing cost as well as ensuring the good fuel efficiency by suppressing the weight of the vehicle body. Another object of the present invention is to provide a freight vehicle capable of reducing labor required for maintenance work and reducing maintenance costs.

  A freight vehicle according to the present invention is a freight vehicle that lowers a loading platform substantially horizontally on the ground behind the vehicle body, is tiltably mounted on a rear part of the vehicle body and tilted by a tilting means, and the tilt guide rail, A sub guide rail that is arranged in parallel and fixed to the inclined guide rail, a first fluid pressure cylinder that is disposed so that the rod can extend in the longitudinal direction of the sub guide rail, and a rod that extends forward of the vehicle body A second fluid pressure cylinder, a rod end of the second fluid pressure cylinder, and an end of the first fluid pressure cylinder rotatably attached to the sub-guide rail. An attachment portion engaged with the sub guide rail so as to be movable along the rod, and a rod extending in the rear of the vehicle body, and the body thereof is fixed in parallel with the body of the second hydraulic cylinder. Ru 3 and the lower end of the front end are engaged with the inclined guide rail so as to be movable along the inclined guide rail, and the substantially tip end of the rod of the third hydraulic cylinder is fixed to the lower rear side. It is characterized by providing.

  In the lorry of the present invention, the attachment portion is engaged with the sub guide rail via a roller provided on the attachment portion so as to be able to roll, and the loading platform is rolled to a lower front end of the loading platform. It is engaged with the said inclination guide rail through the roller provided so that a movement is possible, It is characterized by the above-mentioned.

  Further, the lorry of the present invention moves the loading platform by extending each rod of the first, second, and third fluid pressure cylinders in parallel with the tilting of the tilt guide rail by the tilting means. It is characterized by.

  In addition, although it is preferable to use a hydraulic cylinder as the fluid pressure cylinder in the present invention, it is also possible to use a cylinder of another fluid pressure such as water pressure or air pressure. Further, the tilting means may be an appropriate one such as a hydraulic tilt cylinder capable of extending and retracting the rod in the opposite direction, which will be described later, and a hydraulic tilt cylinder having one end fixed to the vehicle body and the other end fixed to the tilt guide rail. It can be configured. In addition to the configuration in which the end portion of the first fluid pressure cylinder that is rotatably attached to the substantially distal end of the rod of the second fluid pressure cylinder is the substantially distal end of the rod of the first fluid pressure cylinder, It is also possible to be the substantially rear end of the main body of the fluid pressure cylinder.

  In addition to the configurations of the inventions and embodiments, the invention disclosed in the present specification includes those specified by changing these partial configurations to other configurations disclosed in the present specification, or these configurations. To which other configurations disclosed in the present specification are added and specified, or those partial configurations deleted and specified to the extent that partial effects can be obtained are included.

  The lorry of the present invention can load and unload cargo by dropping the platform substantially horizontally on the ground, and also moves the platform by the amount of movement corresponding to the amount of expansion and contraction of the fluid pressure cylinder. Almost all of it can be used for moving the loading platform, and the power of the fluid pressure cylinder can be efficiently used. Further, since the original power of the fluid pressure cylinder is utilized, it is not necessary to use a large fluid pressure cylinder, and it is not necessary to provide a drive mechanism with a complicated chain. Therefore, it is possible to secure a good fuel consumption performance by suppressing the weight of the vehicle body, and to reduce the manufacturing cost. Further, since a drive mechanism using a complicated chain is not provided, labor required for maintenance work can be reduced and maintenance cost can be reduced.

  Further, the first and second fluid pressure cylinders are engaged with the sub guide rails via rollers that roll on the mounting portions of the hydraulic cylinders, and are engaged with the inclined guide rails via rollers that roll on the lower front end of the loading platform. Thus, the attachment portion and the lower part of the front end of the loading platform can be smoothly moved along each guide rail.

  Further, in parallel with the tilting of the tilt guide rail by the tilting means, by extending each rod of the first, second and third fluid pressure cylinders, the maximum tilt angle of the loading platform when lowering the vehicle body is reduced, Safety can be increased.

  An embodiment of a truck according to the present invention will be described.

  As shown in FIGS. 1 to 6, the truck according to the present embodiment is provided with an inclined guide rail 20 and a sub guide rail 30 that are tilted by a tilt cylinder 50 at a rear portion of the vehicle body 10, and the inclined guide rail 20 and the sub guide rail are provided. A loading platform 40 is placed on 30, and a first hydraulic cylinder 60, a second hydraulic cylinder 70, and a third hydraulic cylinder 80 are disposed between the pair of inclined guide rails 20 and 20.

  The inclined guide rail 20 is a substantially U-shaped columnar member in cross-section, and is arranged with its longitudinal direction aligned with the front-rear direction of the vehicle body 10, with the opening side inward and a pair of left and right with a predetermined interval. It has been. The pair of inclined guide rails 20, 20 are connected by connecting members 21 a to 21 d that are bridged between the inclined guide rails 20, 20 below the inclined guide rail 20, and the connecting member 21 a is at the front end of the inclined guide rail 20. The position, the connecting members 21 b and 21 c are installed at the position of the substantially central portion of the inclined guide rail 20, and the connecting member 21 d is installed at the position of the substantially rear portion of the inclined guide rail 20. The inclined guide rail 20 is accommodated so as to engage with a front end roller 41 provided so as to be able to roll on the lower part of the front end of the loading platform 40, and the loading platform 40 is rolled by the rolling of the front end roller 41 along the inclined guide rail 20. Alternatively, the lower part of the front end is movable back and forth along the inclined guide rail 20. A rollable rear end roller 43 is provided at the rear end of the loading platform 40. When the loading platform 40 is lowered to the ground surface 100, the loading platform 40 smoothly moves by the rolling of the rear end roller 43. 100 is to be moved.

  A bracket 22 is formed to project downward at a substantially rear portion of the inclined guide rail 20, and a substantially front end of the bracket 22 is attached to and attached to a tilt shaft 11 that is pivotally supported at a substantially rear end of the vehicle body 10. The inclined guide rail 20 can be tilted about the tilting shaft 11. Further, the tip of the first rod 51 of the tilt cylinder 50 is pivotally attached to the lower side of the front portion of the center of each tilt guide rail 20 so as to be tiltable. The tilting cylinder 50 has two hydraulic cylinders fixed so that the first rod 51 and the second rod 52 extend in opposite directions, and the tip of the second rod 52 is supported near the rear wheel 13 of the vehicle body 10. It is pivotally attached to the portion 12 so as to be tiltable. The tilt cylinder 50 is driven and controlled by a hydraulic mechanism (not shown), and the second rod 52 is gradually extended in accordance with the operation of gradually extending the first rod 51 upward, and the tilt guide rail 20 is tilted from the horizontal state. And the second rod is gradually contracted in accordance with the operation of the first rod 51 gradually contracting, and the tilt guide rail 20 can be returned from the tilted state to the horizontal state.

  The sub-guide rail 30 is a columnar member having a substantially U-shaped cross-section in the same manner as the inclined guide rail 20. The sub-guide rail 30 is disposed inside the inclined guide rail 20 with its longitudinal direction aligned with the longitudinal direction of the vehicle body 10. And a pair of left and right are provided with a predetermined interval therebetween with the opening side inward. The pair of sub-guide rails 30 and 30 are fixed to the inclined guide rail 20 by being fixed to the connecting members 21c and 21d, respectively, and are tilted and moved in conjunction with the tilting operation and the tilt return operation of the tilting guide rail 20. It comes to return to tilt. The sub guide rail 30 has a roller 92 that can be rolled on both ends of an attachment portion 91 between a distal end of a rod 62 of a first hydraulic cylinder 60 and a distal end of a rod 72 of a second hydraulic cylinder 70 described later. The mounting portion 91 can be moved back and forth along the sub guide rail 30 by rolling the rollers 92 along the sub guide rail 30.

  The first hydraulic cylinder 60 is disposed so as to extend the rod 62 rearward along the longitudinal direction of the sub guide rail 30, the rear end of the main body 61 is fixed to the connecting member 21 a, and the approximate center of the main body 61 is While being fixed to the connection member 21b, the front-end | tip of the rod 62 is attached to the attaching part 91 so that rotation is possible. The first hydraulic cylinder 60 is driven and controlled by a hydraulic mechanism (not shown), and the same applies to a second hydraulic cylinder 70 and a third hydraulic cylinder 80 described later.

  The second hydraulic cylinder 70 is disposed so as to extend the rod 72 forward, and is provided in a pair of left and right. The tip of the rod 72 of each second hydraulic cylinder 70 is rotatably attached to the attachment portion 91. Yes. That is, the distal end of the rod 62 of the first hydraulic cylinder 60 and the distal end of the rod 72 of the second hydraulic cylinder 70 are rotatably attached by the attachment portion 91. Between the second hydraulic cylinders 70, 70, a third hydraulic cylinder 80 is disposed so as to extend the rod 82 rearward, and the main bodies 71 71 of the pair of second cylinders 70, 70 and the third hydraulic cylinder 80. The main bodies 81 are juxtaposed and fixed integrally. The tip of the rod 82 of the third hydraulic cylinder 80 is fixed to the loading platform 40 by a fixing portion 42 below the rear portion of the loading platform 40.

  Next, in the lorry of this embodiment, when loading and unloading cargo, the loading platform 40 is lowered onto the ground surface 100 behind the vehicle body 10, and the loading platform 40 is raised from the ground surface 100 behind the vehicle body to the vehicle body 10 for mounting. The operation to be performed will be described.

  When the loading platform 40 is lowered from the vehicle body 10 to the ground surface 100, the first rod 51 and the second rod 52 of the tilt cylinder 50 are gradually extended from the state in which the loading platform 40 in FIG. To do. As the tilting cylinder 50 extends, the tilting cylinder 50 rotates clockwise about the pivoting portion of the support portion 12, and the loading platform 40 mounted on the tilting guide rail 20 and the tilting guide rail 20 has a tilting shaft. 4 is tilted clockwise around the center of FIG.

  Thereafter, as shown in FIGS. 5 and 6, the rod 62 of the first hydraulic cylinder 60 is gradually extended, and the rod 72 of the second hydraulic cylinder 70 and the rod 82 of the third hydraulic cylinder 80 are gradually extended. Until the ground surface 100 is in a substantially horizontal state, the loading platform 40 is lowered from the vehicle body 10 to the ground. When the rods 62, 72, 82 are extended, the attachment portion 91 attached to the tip of the rod 62 of the first hydraulic cylinder 60 is attached to the sub guide rail 30 of the roller 92 according to the extension of the first hydraulic cylinder 60. By the rolling along, it moves smoothly to the position of the rear end of the sub guide rail 30. Furthermore, the main body 71 of the second hydraulic cylinder 70 in which the tip of the rod 72 is attached to the attachment portion 91 and the main body 81 of the third hydraulic cylinder 80 fixed to the main body 71 according to the extension of the hydraulic cylinders 70, 80. Is moved rearward, and the fixing portion 42 fixed to the tip of the rod 82 of the third hydraulic cylinder 80 is moved rearward, so that the front end roller 41 rolls along the inclined guide rail 20 and the rear end roller 43 moves. Due to the rolling of the ground surface 100, the loading platform 40 smoothly moves rearward while reducing the inclination angle and becomes substantially horizontal. Therefore, it is possible to load and unload cargo by placing the loading platform 40 in a substantially horizontal state shown in FIG.

  When raising the loading platform 40 from the ground surface 100 to the vehicle body 10, the reverse operation is performed, and the rods 62, 72, 82 of the first hydraulic cylinder 60, the second hydraulic cylinder 70, and the third hydraulic cylinder 80 are gradually contracted. Then, the state of FIGS. 5 and 6 is restored to the inclined state of the loading platform 40 of FIG. When the rods 62, 72, and 82 are contracted, the attachment portion 91 smoothly moves to the position of the front end of the sub guide rail 30 by rolling along the sub guide rail 30 of the roller 92. Further, the main body 71 of the second hydraulic cylinder 70 and the main body 81 of the third hydraulic cylinder 80 move forward, and the fixing portion 42 fixed to the tip of the rod 82 of the third hydraulic cylinder 80 moves forward, By the rolling of the ground surface of the rear end roller 43 and the rolling of the front end roller 41 along the inclined guide rail 20, the loading platform 40 smoothly moves forward while increasing the inclination angle and is placed on the inclined inclined guide rail 20. To be in an inclined state.

  Thereafter, the first rod 51 and the second rod 52 of the tilt cylinder 50 are gradually contracted. As the rods 51 and 52 contract, the tilting cylinder 50 rotates counterclockwise about the pivoting portion of the support portion 12, and the tilting guide rail 20 and the loading platform 40 rotate counterclockwise about the tilting shaft 11. To return to the substantially horizontal state shown in FIG.

  Moreover, the example of the raising / lowering operation | movement of the said loading platform 40 is the case where the expansion / contraction operation | movement of the rods 51 and 52 of the tilt cylinder 50 and the expansion / contraction operation | movement of the rods 62, 72, and 82 of the hydraulic cylinders 60, 70, and 80 are performed separately in order. However, when the expansion / contraction operation of the rod 51 of the tilt cylinder 50 and the expansion / contraction operation of the rods 62, 72, 82 of the hydraulic cylinders 60, 70, 80 are performed in parallel, the loading platform 40 in the lifting process with respect to the vehicle body 10 is configured. It is preferable that the maximum inclination angle can be reduced and the safety can be improved. When carrying out in parallel, when lowering the loading platform 40 from the vehicle body 10, the rods 51 and 52 of the tilt cylinder 50 are extended, and the rods 62, 72 and 82 of the hydraulic cylinders 60, 70 and 80 are extended in parallel. When the loading platform 40 is raised from the ground surface 100 to the vehicle body 10, the rods 62, 72, 82 of the hydraulic cylinders 60, 70, 80 are contracted, and the rods 51, 52 of the tilt cylinder 50 are contracted in parallel. It should be noted that the operation of the tilting cylinder 50 and the operations of the hydraulic cylinders 60, 70, 80 can be performed in parallel only when either the loading platform 40 is lowered or the loading platform 40 is raised to the vehicle body 10. .

  The lorry in the above embodiment can load and unload cargo 40 by dropping the carrier 40 substantially horizontally on the ground surface 100, and the carrier 40 can be moved by an amount corresponding to the amount of expansion and contraction of the hydraulic cylinders 60, 70, and 80. It is possible to move, and almost all of the power of the hydraulic cylinders 60, 70, 80 can be used to move the loading platform, and the power of the hydraulic cylinders 60, 70, 80 can be used efficiently. Further, since the original power of the hydraulic cylinders 60, 70, 80 is utilized, it is not necessary to use a large hydraulic cylinder, and further, it is not necessary to provide a drive mechanism with a complicated chain. Good fuel efficiency can be ensured and the manufacturing cost can be reduced. Further, since a drive mechanism using a complicated chain is not provided, labor required for maintenance work can be reduced and maintenance cost can be reduced.

  The present invention can be used for a freight vehicle for carrying cargo.

The top view of the lorry of an embodiment. The top view which shows the installation location of the 2nd and 3rd hydraulic cylinder in the lorry of embodiment. The side view which shows the vehicle body rear part in the freight vehicle of embodiment. The side view which shows the vehicle body rear part at the time of the loading platform inclination in the lorry vehicle of embodiment. The side view which shows the vehicle body rear part at the time of the carrier back movement in the lorry of an embodiment. The top view which shows the vehicle body rear part at the time of the carrier back movement in the lorry vehicle of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Vehicle body 11 ... Tilt axis 12 ... Support part 13 ... Rear wheel 20 ... Inclination guide rail 21a-21d ... Connecting member 22 ... Bracket 30 ... Sub guide rail 40 ... Loading platform 41 ... Front end roller 42 ... Fixed part 43 ... Rear end roller DESCRIPTION OF SYMBOLS 50 ... Tilt cylinder 51 ... 1st rod 52 ... 2nd rod 60 ... 1st hydraulic cylinder 70 ... 2nd hydraulic cylinder 80 ... 3rd hydraulic cylinder 61, 71, 81 ... Main body 62, 72, 82 ... Rod 91 ... Mounting part 92 ... Roller 100 ... Ground surface

Claims (3)

A truck that lowers the loading platform substantially horizontally on the ground behind the vehicle body,
A tilt guide rail pivotally attached to the rear of the vehicle body and tilted by tilting means;
A sub-guide rail that is juxtaposed with the inclined guide rail and fixed to the inclined guide rail;
A first fluid pressure cylinder disposed to extend a rod in a longitudinal direction of the sub guide rail;
A second fluid pressure cylinder disposed to extend the rod forward of the vehicle body;
A substantially tip end of a rod of the second fluid pressure cylinder and an end of the first fluid pressure cylinder are rotatably attached and engaged with the sub guide rail so as to be movable along the sub guide rail. A mounting part,
A third fluid pressure cylinder, which is disposed so that the rod can be extended at the rear of the vehicle body, and whose main body is arranged in parallel with the main body of the second fluid pressure cylinder;
A lower part of a front end is engaged with the inclined guide rail so as to be movable along the inclined guide rail, and a loading platform is provided, wherein a substantially tip end of a rod of a third hydraulic cylinder is fixed to a substantially lower rear side. Lorry to do. The attachment portion is engaged with the sub guide rail via a roller provided on the attachment portion so as to be able to roll,
The lorry according to claim 1, wherein the cargo bed is engaged with the inclined guide rail via a roller that is rotatably provided at a lower front end of the cargo bed.   The parallel to the tilting of the tilt guide rail by the tilting means, the rods of the first, second and third fluid pressure cylinders are extended to move the cargo bed. The listed lorry.

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