JP2020006931A - Retractable loading platform lifting device - Google Patents

Abstract

To alleviate vehicle equipment layout restrictions.SOLUTION: A retractable loading platform lifting device, which pulls a loading platform 20 into a lower part of a vehicle frame and store the same, comprises: a guide rail 31 which is fitted to the lower part of the vehicle frame; a slider 32 movable along the guide rail; an arm 42 which connects the slider and the loading platform 20; and the loading platform connected to a tip of the arm. The loading platform includes a base end side loading platform 21 connected to the arm, and a tip side loading platform 22 which rotatably connected to a rear part of the base end side loading platform. A connection between the base end side loading platform and the tip side loading platform is positioned on a rear side with respect to a center of a loading surface of the loading platform. In the state that the tip side loading platform is folded and overlapped on an upper side of the base end side loading platform and the loading platform is stored, a loading surface of the base end side loading platform is partitioned into a rear side covered area A which is covered with the tip side loading platform and an exposed front side covered area B, and a space S, in which the tip side loading platform faces backward, is secured between the exposed area of the loading surface and the vehicle frame.SELECTED DRAWING: Figure 3

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device for supporting the loading / unloading operation of luggage and the like from / to a loading platform of a vehicle, and more particularly, to a retractable loading / unloading device for retracting and loading a loading tray below a vehicle frame.

  The cradle lifting device raises and lowers the cradle between the height of the floor of the vehicle and the height of the ground, and supports the work of loading and unloading luggage and the like on the vehicle. There is a stowage type lifting and lowering device that retracts and retracts a loading tray below a vehicle frame (see Patent Document 1 and the like).

JP 2017-178171 A

  In many cases, the receiving tray of the retractable loading tray lifting device has a folding structure. The receiving tray disclosed in Patent Document 1 is also divided into two front and rear receiving trays on the base end side and the distal end side, and at the time of storage, the receiving tray on the distal end side is folded back and overlaps the upper receiving tray on the base end side. . In order to shorten the front and rear length of the folded state, generally, the front and rear lengths of the front end receiving tray are set to be equal to or longer than the base receiving tray, and the upper portion of the proximal receiving tray is set at the time of storage. It was entirely covered by the front end receiving platform. For this reason, the storage rack becomes thicker during storage, and the storage rack must be as close as possible to the vehicle frame in order to secure a predetermined departure angle.

  However, in vehicles equipped with a retractable receiving platform, the number of in-vehicle devices tends to increase or expand due to multifunctionalization and the like. With this, restrictions on the device layout on the vehicle side are increasing, and it may be necessary to arrange a new device in the vehicle frame or change the shape or size of the existing device. In such a situation, if the receiving tray in the stored state is too close to the vehicle frame, a part of the lower side of the vehicle frame is closed by the receiving rack, which further restricts the layout of the on-vehicle equipment.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a retractable loading / unloading device that can reduce restrictions on the equipment layout of a vehicle.

  In order to achieve the above object, a retractable loading / unloading device according to the present invention is a retractable loading / unloading device that retracts and stores a loading tray at a lower portion of a vehicle frame, and a guide rail attached to a lower portion of the vehicle frame, A slider movable along the guide rail, an arm connecting the slider and the load receiving table, and a load receiving table connected to a tip of the arm; the load receiving table is connected to the arm; A base-side cradle, and at least one distal cradle rotatably connected to a rear portion of the base-side cradle, the connection between the base-side cradle and the distal-side cradle; The part is configured to be located behind the center of the receiving surface of the receiving tray, and in a state where the distal receiving tray is folded over the base receiving tray and the receiving tray is stored, The receiving surface of the base-side receiving platform is It is divided into a rear covering area covered with the end receiving platform and a front exposed area that is exposed, and a space is secured between the exposed region of the receiving surface and the vehicle frame so that the front end receiving platform faces rearward. It is configured to be.

  ADVANTAGE OF THE INVENTION According to this invention, the restrictions of the equipment layout of a vehicle can be eased.

FIG. 1 is a side view showing a state in which a retractable loading tray lifting device according to an embodiment of the present invention is mounted on a vehicle and the loading tray is stored. FIG. 1 is a side view showing a state in which a retractable loading tray lifting device according to an embodiment of the present invention is mounted on a vehicle and the loading tray is expanded. Side view of the retractable loading tray elevating / lowering device (with the loading tray stored) according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

-Retractable lifting platform-
FIG. 1 is a side view showing a state in which a retractable loading tray elevating device according to an embodiment of the present invention is mounted on a vehicle and the loading tray is stored, and FIG. 2 is a side view showing a state where the loading tray is expanded. 3 is a side view of the retractable loading tray lifting device. In the specification of the present application, the left and right in FIGS. 1 to 3 are the front and rear of a retractable loading / unloading device (hereinafter abbreviated as a loading / loading device). For example, FIG. 1 to FIG. 3 illustrate a case in which the loading / unloading device is mounted at the rear of the vehicle and the loading tray is pulled out to the rear side of the vehicle. Match in the front-back direction. However, there is a case where the loading / unloading device is mounted on the side of the vehicle so as to pull out the loading dock. In that case, the front-rear direction of the loading tray elevating device is orthogonal to the front-rear direction of the vehicle.

  The illustrated vehicle includes a vehicle frame (chassis frame) F and a driver's cab (not shown) provided in front of the vehicle frame F. A carrier (not shown) 20 (not shown) is mounted on the upper part of the vehicle frame F. In the present embodiment, the loading platform elevating device 1 is mounted on the rear lower side of the vehicle frame F. For example, when the vehicle is running, the loading cradle elevating device 1 folds the loading cradle (platform) 2 and retracts and stores it below the vehicle frame F. On the other hand, at the time of the cargo handling operation (loading / unloading of the cargo on the carrier), the carrier 20 is pulled out of the vehicle frame F (rearward in the present embodiment), deployed, and raised and lowered between the floor height of the carrier and the ground level. Support the cargo handling work (Fig. 2).

  The loading tray lifting device 1 includes a loading tray 20, a slider unit 30, a lifter unit 40, a power unit (not shown), and a control device (not shown). The slider unit 30 is a unit that includes an actuator that moves the load receiving table 20 and the like in the front-rear direction. The lifter unit 40 is a unit that includes an actuator that raises and lowers the loading tray 20. The power unit is a driving device that drives the slider unit 30 and the lifter unit 40. The control device is a device that controls the power unit. The slider unit 30, the lifter unit 40, and the receiving table 20 will be sequentially described.

-Slider unit-
The slider unit 30 includes left and right guide rails 31, a slider 32, and a slide cylinder 33 (FIG. 2). The left and right guide rails 31 are attached to the lower rear portion of the vehicle frame F so as to extend in the front-rear direction and in parallel. The slider 32 is slidably mounted on the left and right guide rails 31 and is movable back and forth along the guide rails 31. The slide cylinder 33 is a double-acting hydraulic cylinder, and both ends thereof are fixed to the guide rail 31 and the slider 32 via appropriate support members. The slider 32 moves back and forth along the guide rail 31 by the expansion and contraction operation of the slide cylinder 33, and the load receiving table 20 supported by the slider 32 via the lifter unit 40 moves back and forth.

-Lifter unit-
The lifter unit 40 includes a first arm (tilt arm) 41, a second arm (lift arm) 42, a third arm (compression arm) 43, and a pair of left and right lift cylinders 44. The lifter unit 40 supports a portion between the left and right ends of the receiving table 20 so as not to interfere with the receiving surface. The upper part of the first arm 41 is connected to the slider 32 via a pin, and the lower part rotates back and forth. The second arm 42 is rotatably connected at its front end to the first arm 41 and at its rear end to the receiving table 20 via axes P1 and P2 extending left and right. The third arm 43 is rotatably connected at its front end to the slider 32 and at its rear end to the load receiving table 20 via axes P3 and P4 extending left and right. The lift cylinder 44 is a single-acting hydraulic cylinder (may be a double-acting type). In this embodiment, the rod side is rotatably connected to the lower part of the first arm 41 and the bottom side is rotatably connected to the second arm 42. . The second arm 42 and the third arm 43 form a parallel link that connects the loading table 20 to the slider 32 so as to be able to move up and down (the axes P1 to P4 form a parallelogram vertex angle). The parallel link is driven to rotate up and down in conjunction with the expansion and contraction drive of the lift cylinder 44, so that the load receiving table 20 moves up and down while maintaining a horizontal posture.

−Receiving stand−
The receiving platform 20 is a platform that receives and lifts the load and the like, and is rotatable via a hinge (not shown) at the rear end of the proximal receiving platform 21 connected to the lifter unit 40 and at the rear of the proximal receiving platform 21. The front-end-side receiving tray 22 is connected. The distal-side receiving platform 22 rotates about the hinge as a fulcrum, and reverses counterclockwise (counterclockwise) (rotates 180 degrees) from the unfolded state (FIG. 2) when viewed from the left, and rotates the base-side receiving platform 21. (FIG. 1). The rear end surface of the folded loading tray 20 forms a bumper (FIG. 1). The left and right widths of the loading tray 20 are, for example, approximately the same as the width of the loading tray, and are wider than the outer dimensions of the left and right vehicle frames F. In the present embodiment, the distal-side receiving tray 22 is a non-foldable type, and the receiving tray 20 has a two-fold structure including only one distal-side receiving tray 22. Also, when viewed from the left and right, the receiving tray 20 is formed in a triangular shape so as to become thinner from the base end to the front end (rear) in the unfolded state (the state of FIG. 2).

  At this time, the connecting portion (that is, the position of the hinge) between the base-side receiving pedestal 21 and the distal-side receiving pedestal 22 has the receiving surface (upper surface) of the deployed receiving cradle 20 as shown in FIG. ) Is located rearward (at the front end side) of the center. The front-rear length of the distal-side receiving tray 22 is shorter than the front-rear length of the proximal-side receiving tray 21, and the receiving surface of the proximal-side receiving tray 21 occupies a majority of the receiving surface of the unfolded receiving tray 20. . In the present embodiment, the front-rear length of the distal-side receiving tray 22 is set to about half of the front-rear length of the proximal-side receiving tray 21, and about two-thirds of the front of the entire receiving surface is set at the rear-side receiving tray 21. The case where about one-half is constituted by the front end-side receiving tray 22 is illustrated. The overall size (length in front and rear and width in left and right) of the receiving surface is substantially the same as that of the retractable loading tray lifting device of the same class.

  In a state in which the distal-side receiving tray 22 is folded over the base-side receiving tray 21 and the receiving tray 20 is stored (the state in FIGS. 1 and 3), the distal end of the distal-side receiving tray 22 (extends linearly to the left and right). The edge) divides the receiving surface of the base-side receiving tray 21 into a covered area A and an exposed area B. The covering area A is a rectangular area on the rear side of the base end receiving pedestal 21 covered by the distal end receiving pedestal 22. The exposed area B is a rectangular area on the front side of the base-side receiving tray 21 that is exposed without being covered by the distal-side receiving tray 22 even in the stored state. At least a part of the exposed area B is located behind the axis P2 connecting the load receiving platform 20 and the second arm 42, and the exposed area B occupies a certain percentage of the receiving surface of the proximal receiving platform 21. is occupying. In the present embodiment, since the front-rear length of the distal-side receiving tray 22 is about half of the front-rear length of the proximal-side receiving tray 21, the front and rear lengths of the covering region A and the exposed region B are substantially the same. It occupies about the front half of the receiving surface of the base end receiving platform 21.

  With such a configuration, when the loading cradle lifting device 1 is mounted on a vehicle and the loading cradle 20 is stored, a space S (FIG. 3) is secured between the exposed area B of the loading surface and the vehicle frame F. The space S is a space in which the components of the loading tray lifting device 1 do not exist, and is located in front of the distal loading tray 22 that is folded over the base loading tray 21 (toward the rear of the loading tray 22). Are facing each other). In other words, the rear side of the space S is covered with the front end receiving tray 22. The vertical dimension (height dimension) of the space S is larger than the thickness (maximum thickness) of the tip-side loading tray 22 (FIG. 3).

  In the present embodiment, an in-vehicle device X (described later) is installed in the vehicle frame F using the space S secured below the vehicle frame F. The in-vehicle device X can be attached to the lower surface of the vehicle frame F as long as it can be accommodated in the space S, or a portion that cannot be accommodated in the space between the left and right vehicle frames F when arranged between the left and right vehicle frames F is the space S. Can also be projected. When the in-vehicle device X is installed in the vehicle frame F by using the space S in this manner, in a state where the receiving platform 20 is stored, the front end receiving platform 22 is at least partially connected to the in-vehicle device X (the in-vehicle device accommodated in the space S). (Device X or a part thereof). At the same time, the exposed area B of the receiving surface vertically overlaps at least a part (same) of the vehicle-mounted device X.

-Effect-
(1) According to the present embodiment, the space S can be secured between the exposed area B of the receiving surface and the vehicle frame F even when the receiving table 20 is stored. The in-vehicle device X can be installed in F. By securing the space S, restrictions on the equipment layout of the vehicle can be eased.

  In recent years, the urea SCR system has been increasingly used in the automobile field, and it is necessary to install an urea water tank, an electric system for controlling the urea SCR system, and the like. In addition, a hybrid vehicle that has both a motor and an engine as a prime mover and obtains the driving force of the vehicle by combining them is also in practical use. There are cases where a large battery is mounted on a hybrid vehicle. In addition, with the installation of such a new in-vehicle device, it may be necessary to review the layout including the existing in-vehicle device such as an oil tank. Vehicles equipped with a loading / unloading device are no exception. The in-vehicle device X shown in FIG. 3 may correspond to, for example, an oil tank and the like in addition to the urea SCR system and the battery for a hybrid vehicle. By securing the space S, it is possible to contribute to the improvement of the degree of freedom of the layout of the in-vehicle device X.

  Further, since the rear side of the space S is covered by the front end receiving tray 22 constituting the bumper, there is an advantage that the in-vehicle device X arranged in the space S can be protected by the front receiving base 22. Also, the lower surface of the vehicle-mounted device X can be protected by the base-side receiving tray 21.

  (2) Conventionally, the ratio of the area of the front end receiving cradle to the entire receiving surface is about half or more, and the front end receiving cradle has a large front and rear length and thickness and is heavy. Therefore, a guide roller (a guide roller 21 in Patent Literature 1) for a storing operation is provided in a general retractable loading / unloading device, and as a preparatory operation for storing the receiving tray after use, the load on the distal end is manually received. The platform was leaning against the guide rollers. In addition, a torsion bar is applied to a connection portion between the base-side load receiving platform and the distal-side load receiving platform to assist the lifting of the distal-side load receiving platform so as to lean against the guide rollers.

  On the other hand, according to the present embodiment, as in the related art, the receiving tray 20 is formed so as to become thinner toward the distal end, but the distal receiving tray 22 is shortened in the front-rear direction. Therefore, the tip-side receiving tray 22 is not only shorter but also thinner and much lighter than the conventional one. As a result, guide rollers and torsion bars can be eliminated, and the number of parts can be reduced. However, a configuration in which a guide roller and a torsion bar are applied as in the related art can also be adopted.

  Further, since the receiving table 20 has a structure that can be folded at a thin portion as compared with the related art, the rear end of the receiving table 20 in the stored state becomes thinner, so that the departure angle can be easily secured.

−Others−
In the above-described embodiment, the structure in which the receiving tray 20 is folded at one place with the tip receiving tray 22 as one sheet is exemplified. However, as long as the exposed region B is secured, the tip receiving tray 22 is moved forward and backward by a plurality of sheets. By using a receiving platform, the receiving platform 20 may be folded at two or more locations.

  Although the front and rear lengths of the covering region A and the exposed region B are made substantially the same, if it is necessary to increase the front and rear length of the space S, the length of the exposed region B is increased and the length of the covering region A is appropriately adjusted. It is good also as a structure made small. Conversely, when the front-back length of the space S is reduced, the length of the exposed region B may be reduced and the length of the covering region A may be increased. In the case of a structure in which the lower side is cut out at the rear end of the vehicle frame F (a structure in which the thickness of the vehicle frame is reduced upward only at the rear end), a part of the front end receiving tray 22 enters the cut out region. You may do it. In the case of this structure, even if the thickness becomes large as a structure in which the receiving tray 20 is folded plural times, the receiving tray 20 is stored by avoiding interference with the in-vehicle device X and the vehicle frame F by the cutout of the vehicle frame F. be able to.

  As described above, the lifter unit 40 does not interfere with the space S because the lifter unit 40 supports the portion between the left and right ends of the cargo receiving table 20 while avoiding the receiving surface. A configuration that interferes with the space S may be used. For example, as shown in FIG. 1, when a part of the in-vehicle device X installed between the vehicle frames F projects below the vehicle frame F, the lifter units 40 (the second left and right arms 42 and the like) move the loading tray 20. A configuration in which the right and left ends of the load receiving table 20 are supported by being sandwiched from the left and right can be adopted. Since the operation area of the lifter unit 40 is outside the vehicle frame F and cannot interfere with the in-vehicle device X (specifically, a portion protruding downward from the vehicle frame F), the lifter unit 40 is provided separately from the in-vehicle device X. There is no problem even if it interferes with the space S.

  In addition, the description has been given by taking as an example the case where the retractable loading tray lifting device that stores the loading tray 20 below the vehicle frame F is applied. However, there is a retractable loading tray elevating device that can select a storage attitude in which the loading tray is raised along a wall surface (for example, a rear surface) of the loading tray of the vehicle, in addition to a storage attitude in which the loading tray is stored below the vehicle frame. . The present invention is also applicable to a retractable loading / unloading device that adopts such two storage postures.

DESCRIPTION OF SYMBOLS 1 ... Retractable loading stand raising / lowering apparatus, 20 ... Receiving stand, 21 ... Base end receiving stand, 22 ... Distal receiving side, 31 ... Guide rail, 32 ... Slider, 41 ... 1st arm (arm), 42 ... No. 2 arm (arm), 43: third arm (arm), A: covered area, B: exposed area, F: car frame, P2: axis, S: space, X: in-vehicle equipment

Claims (5)

In the retractable cradle lifting device that retracts the cradle into the lower part of the car frame and stores it,
A guide rail attached to a lower portion of the vehicle frame,
A slider movable along the guide rail,
An arm connecting the slider and the receiving table;
And the loading table connected to the tip of the arm,
The receiving cradle includes a proximal loading cradle connected to the arm, and at least one distal loading cradle rotatably connected to a rear portion of the proximal loading cradle. The connecting portion between the receiving table and the front-side receiving table is configured to be located behind the center of the receiving surface of the receiving table,
In a state in which the distal-side cradle is folded over the proximal-side cradle and the cradle is stored, the receiving surface of the proximal-side cradle is covered with the distal-side cradle. And a front-side exposed area that is exposed, and is configured such that a space in which the front end-side receiving base is opposed rearward is secured between the exposed area of the receiving surface and the vehicle frame. Platform elevating device.   2. The retractable loading / unloading device according to claim 1, wherein at least a part of the exposed area is located behind a shaft connecting the loading tray and the arm.   The retractable loading / unloading device according to claim 1 or 2, wherein the front-end-side loading trolley is at least partially in front of and behind at least a part of on-vehicle equipment installed in the vehicle frame using the space in a state where the loading pod is stored. A retractable loading platform elevating device that overlaps with.   4. The retractable loading / unloading device according to claim 3, wherein the exposed area vertically overlaps at least a part of the on-vehicle device in a state where the loading tray is stored.   The retractable loading / unloading device according to any one of claims 1 to 4, wherein the loading tray has a two-fold structure including only one tip-side loading tray, and the front-to-back length of the tip-side loading tray is reduced. And a retractable loading / unloading device that is shorter than the front-rear length of the base-side loading tray.

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