JP6202737B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a load receiving platform lifting apparatus including a load receiving platform supported by a link arm and housed below a vehicle loading platform.

  In the load receiving platform lifting device in which the load receiving platform is stored below the vehicle loading platform, the load receiving platform is pulled out to the rear of the vehicle when loading and unloading. For example, as shown in the side view of FIG. 4A, the load receiving platform lifting device 90 slides back and forth below the load receiving platform 91, and lifts the load receiving platform 92 supported by the link arm 93. The lifting and lowering of the load receiving platform 92 is driven by a lift cylinder 94. The link arm 93 is rotated by the expansion and contraction of the lift cylinder 94, and the load receiving table 92 is moved up and down (Patent Document 1).

  Further, the cargo receiving table 92 is folded back and forth as shown in FIG. 4A after the work is completed (arrow A91). Next, as shown in FIG. 4 (b), it moves up (arrow A92), slides forward (arrow A93), and is stored below the loading platform 91.

JP 2006-001331 A

  When the departure angle (angle of the line connecting the lower rear end of the vehicle and the ground contact point of the rear wheel) becomes too small, the load receiving platform lifting device 90 mounted below the loading platform 91 travels on an inclined ground or the like. When doing so, the rear of the vehicle may interfere. Therefore, it is desirable that the departure angle is set large.

  However, as shown in the enlarged view of FIG. 4 (b), the load receiving platform 92 is provided with a reinforcing material (stiffener) 92b on the lower surface of the hatched load carrying panel 920 and has a certain thickness or more, so that a departure angle is secured. There is room for improvement.

  Two reinforcing members 92b are provided near the center in the width direction of the cargo cradle, and a link arm 93 is connected to the base side of the cargo cradle. For this reason, the link arm 93 has a shape that sinks into the lower side of the load receiving platform 92.

Therefore, by providing not only the reinforcing material 92b but also the link arm 93 having the above-described shape, the angle (departure angle) of the imaginary line L91 connecting the lower rear end of the vehicle and the rear wheel ground contact point is actually. It is getting smaller. In particular, the larger the rear overhang of the vehicle (the horizontal distance from the rear wheel center position to the rear end of the loading platform), the smaller the departure angle.
The present invention has been made in view of these points, and an object of the present invention is to provide a load receiving table lifting device capable of ensuring a large departure angle in a state of being stored below the loading platform.

  In the present invention, the following means are used to solve the above problems.

  A pair of left and right chassis frames extending in the front-rear direction of the vehicle, a pair of left and right link arms supported at the base end of the frame and capable of rotating up and down, a hydraulic cylinder for driving the rotation of the arms, and the link The present invention is directed to a load receiving platform lifting device that includes a load receiving platform that is supported by a distal end portion of an arm and is stored below the loading platform of the vehicle.

The left and right end portions of the load receiving platform are supported by the distal end portion of the link arm, and the hydraulic cylinder has a longitudinal direction extending from the base end portion to the distal end portion with respect to the link arm. It is characterized by being.
Moreover, it is good also as a structure with which the support part of the said link arm which supports the said load receiving stand with respect to the said load receiving stand raising / lowering apparatus is provided in the side part of the said load receiving stand.

  Further, the side surface portion of the load receiving table includes a protruding portion protruding upward, the link arm includes two arm members, and the support portion of one arm is provided on the protruding portion. Further, a configuration may be employed in which the other support portion is provided above the other support portion.

  In addition, the hydraulic cylinder may be configured such that its cylinder rod or cylinder tube is attached in a state of being pivotally supported by the link arm.

  At this time, the link arm includes two arm members, one arm member is constituted by one arm bracket, and the hydraulic cylinder may be attached to the arm bracket. .

  Since the link arm is configured to support the left and right ends of the load receiving table as in the load receiving table lifting device of the present invention, the link arm is not shaped to sink under the load receiving table, but at least the load receiving table. It can be made into the shape connected with the side edge part of a stand. Therefore, it can suppress that a link arm protrudes below.

  Further, since the hydraulic cylinder for rotating the link arm is also provided with the direction from the base end portion to the tip end portion of the link arm as the longitudinal direction, it is possible to suppress the hydraulic cylinder from protruding downward from the link arm. .

  As described above, by suppressing the downward projecting amount, it is possible to secure a sufficient ground height when the load receiving table is in the housed state, and also to ensure a departure angle of a desired angle or more.

It is a side view of the vehicle provided with the load receiving table raising / lowering apparatus which concerns on embodiment of this invention. (A) is a perspective view which shows the accommodation state of the load receiving device raising / lowering apparatus which concerns on embodiment of this invention, (b) is a perspective view which shows the use condition of the load receiving device raising / lowering device. (A) is a perspective view which shows the support part of the link arm and load receiving stand of the load receiving stand raising / lowering apparatus which concerns on embodiment of this invention, (b) is a top view which shows the said support part. It is a side view of the load receiving table raising / lowering apparatus which concerns on a prior art form.

An example of the present invention will be described with reference to the drawings.
FIG. 1A is a side view of the load receiving platform lifting device 100 mounted on the rear side of the vehicle 1 and shows a state in which the load receiving platform 3 is stored below the load platform 2 in the vehicle 1.

  The load receiving table elevating device 100 includes a load receiving table 3 in which a distal end panel 32 is folded with respect to a base end panel 31, a link arm 4 that supports the load receiving table 3, and a hydraulic pressure that is a driving source for the rotation operation of the link arm 4. A lift cylinder 5a and a slide member 6 that supports the link arm 4 so as to be rotatable and can slide forward and backward.

  The slide member 6 is slidably attached to the slide rail 7. The slide rail 7 is provided on the chassis frame 7 via rail brackets B1 and B2 along the chassis frame 7 extending in the vehicle longitudinal direction. The slide member 6 includes a cross frame 6a provided so as to cross the slide rail 7, and two slide brackets 61b and 62b fixed to end portions of the cross frame 6a. One end of a hydraulic slide cylinder (not shown) is connected to the cross frame 6a, and the other end of the cylinder is attached to a horizontal member 9 installed on a pair of left and right chassis frames 8 extending in the longitudinal direction of the vehicle. It is connected. The slide cylinder is attached with the vehicle longitudinal direction extending and retracting, and the slide member 6 slides on the slide rail 7 as the slide cylinder expands and contracts.

  The link arm 4 has a structure provided with arms on the inside and outside. As shown in FIG. 1B, the compression arm 41 located on the outer side is pivotally supported via the first pin P1 on the slide bracket 61b located on the outer side of the two slide brackets 61b and 61b. The other end is pivotally supported via the second pin P2 with respect to the side surface portion of the base end panel 31 of the load receiving platform 3. Therefore, the compression arm 41 is provided so as to be rotatable with the first pin P1 as a support portion with respect to the slide bracket 61b, and the load receiving platform 3 is provided as a rotation with the second pin P2 as a support portion with respect to the compression arm 41. It has been.

  The compression arm 41 includes an intermediate portion 411 curved downward in the drawing and a portion (hereinafter referred to as a base) near one end (first pin P1 side) extending in a substantially horizontal direction when the load receiving platform 3 is stored. End portion 412 and a portion (hereinafter referred to as a tip portion) 413 near the other end portion (second pin P2 side) that extends in the substantially horizontal direction from the intermediate portion 411 when the load receiving tray 3 is stored. . As shown in the figure, the base end portion 412 and the tip end portion 413 are arranged in substantially the same straight line, and the compression arm 41 is supported by the second pin P2 from the portion supported by the first pin P1. Is extended in a substantially horizontal direction (substantially in the same straight line shape) toward the portion supporting the shaft. Further, the compression arm 41 is also provided with an extending portion 41a that further extends from the second pin P2. When the load receiving platform 3 is in the stowed state, as viewed from the side, the extension 41 a overlaps the load receiving stand 3, and the extension 41 a is below the base end panel 31 of the load receiving stand 3. It does not protrude.

  On the other hand, one end of the lift arm 42 located on the inner side of the link arm 4 is pivotally supported by the bracket 61b located on the inner side of the two slide brackets 61b and 61b via the third pin P3. The other end is pivotally supported via a fourth pin P4 on a support bracket 31B fixed to the side surface of the base end panel 31 of the load receiving platform 3. The support bracket 31B has a protruding portion 310B protruding above the thickness of the base end panel 31, and the fourth pin P4 is provided on the protruding portion 310B.

  The lift arm 42 includes an intermediate portion 421 that is curved downward in the drawing and one end portion (first pin) that is inclined downward from the third pin P3 toward the intermediate portion 421 when the load receiving tray 3 is stored. P1 side) portion (hereinafter referred to as the base end portion) 422 and a portion near the other end portion (second pin P2 side) that extends in the substantially horizontal direction from the intermediate portion 421 when the receiving tray 3 is stored. (Hereinafter referred to as a tip portion) 423.

  A hydraulic lift cylinder 5a is attached to the lift arm 42, and a cylinder tube end is pivotally supported on the middle of the lift arm 42 and a cylinder rod end is pivotally supported on the lower end of the slide bracket 61b. The lift cylinder 5a has a longitudinal direction in a direction from a base end portion (first pin P1 or third pin P3 side) to a tip end portion (second pin P2 or fourth pin P4 side) in the compression arm 41 or the lift arm 42. It is provided as. For example, when the load receiving platform 3 is in the housed state, the longitudinal direction of the lift cylinder 5a is the longitudinal direction of the lift cylinder 5a, like the compression arm 41 and the lift arm 42.

  By providing the link arm 4 and the lift cylinder 5a as shown in the figure, the load receiving platform lifting device 100 is lower than the portion where the link arm 4 and the lift cylinder 5a are supported on the vehicle 1 (cross frame 6a) side. A ground height (hereinafter referred to as arm support portion ground height) H that does not protrude to the side can be secured. Moreover, the support part of the link arm 4 with respect to the load receiving stand 3 is provided so that it may be included in the range of the height H1, and each front-end | tip part 413, 423 of the link arm 4 is below the said height H1. It has a configuration that does not protrude. Therefore, in the base end panel 31, the protrusion part is not provided in the lower surface, but the ground height H2 is set larger than said arm support part ground height H. Further, the intermediate portions 411 and 421 of the link arm 4 are curved with such a size that they do not protrude below the above-mentioned arm support portion ground height H. Therefore, in the load receiving table elevating device 100 according to the present embodiment, the departure angle α (see FIG. 1A) can be provided largely. In particular, in a large vehicle having a large rear overhang RO, the link arm 4 and the lift cylinder 5a do not protrude below the arm support portion ground height H, so that the inclination angle of the virtual line L forming the departure angle α is small. Even in this case, it is possible to avoid the crossing of the part of the load receiving platform lifting device 100 between the rear wheel RT and the rear end lower portion of the base end panel 31 with respect to the virtual line L, and the departure angle α can be reduced. Can be prevented. In this embodiment, the rear overhang RO is set to about 3,500 mm, the ground height H is set to about 315 mm, and the departure angle α is set to about 7 degrees.

  As for the mechanism of the link arm 4, the second pin P2 and the fourth pin P4 are provided so as to be aligned in a substantially vertical direction, whereas the first pin P1 is behind the third pin P3 in the vehicle. It is located so that it may not line up in the substantially vertical direction. Therefore, the link arm 4 according to the present embodiment is configured with a non-parallel link mechanism.

  Next, the sliding operation of the load receiving table lifting apparatus 100 will be described with reference to the perspective view of FIG. FIG. 2 (a) shows the storage state of the load receiving platform 3, and FIG. 2 (b) shows the state in which the load receiving platform 3 is unfolded and lowered at the rear of the vehicle.

  As shown in FIG. 2A, the load receiving platform 3 is supported at both ends in the vehicle width direction (load receiving table width direction) by the left and right link arms 4. The left and right link arms 4 are provided such that the distance between them is approximately the same as the vehicle width. For this reason, unlike the link arm 4 being provided at a position closer to the center in the vehicle width direction, the link arm 4 is not shaped so as to dive below the load receiving table 3 in the storage state of the load receiving table 3, It can be made the shape extended from the cross frame 6a to the load receiving stand 3 in the substantially horizontal state seeing from the direction. The closer the storage height of the load receiving table 3 is to the slide rail 7, the higher the ground height H2 and the departure angle α of the load receiving table 3 are preferable. When the receiving platform 3 is in the stored state, the first pin P1 and the second pin P2 have the same height, and the third pin P3 and the fourth pin P4 have the same height. And the extension part 41a used as the front-end | tip part of the compression arm 41 becomes the attitude | position which overlaps with the load receiving stand 3 seeing from the side, and does not protrude below the load receiving stand 3. FIG. If the load receiving platform 3 can be moved further from the position of the slide rail 7 and the load receiving platform 3 shown in FIG. 2A and can be stored, the link arm 4 is inclined upward toward the rear of the vehicle. It is good also as a structure which made it the extended state and the extension part 41a protruded upwards rather than the base end panel 31 of the load receiving stand 3. FIG.

  Further, as shown in FIG. 2B, a slide cylinder 5b is attached to the horizontal member 9 and the cross frame 6a at a substantially central position in the vehicle width direction. The slide cylinder 5b is a unit body formed by combining two cylinders, and is provided such that one cylinder rod extends forward of the vehicle and the other cylinder rod extends rearward of the vehicle. As shown in the figure, when the slide cylinder 5b is in the extended state, the load receiving platform 3 is pulled out to the work position where the load loading and unloading work is performed. And the front-end | tip panel 32 is expand | deployed by the vehicle rear side, the base end panel 31 is formed and the load mounting panel which becomes substantially flush is formed, and the load receiving stand 3 raises / lowers using the expansion-contraction force of the lift cylinder 5a.

  When the load receiving platform 3 rises to a height substantially equal to the floor surface height of the load loading platform 1, the load receiving platform 3 is in a horizontal state, and the extension portion 41 a of the compression arm 41 is formed from the upper surface of the base end panel 31. Also protrudes upward. Further, the link arm 4 rotates upward while the compression arm 41 and the lift arm 42 avoid interference with the rear end portion of the loading platform 1 by the curved intermediate portions 411 and 421. In particular, the link arm 4 according to the present embodiment is provided at a position substantially coinciding with the left and right end portions of the vehicle, and can prevent interference with the tail lamp and further with the combination lamp.

  When the load receiving platform 3 is lowered, the load placement surface is inclined little by little because the link arm 4 forms a non-parallel link mechanism. In order to ensure the stability of the load during ascending / descending, it is preferable to reduce the inclination of the load placement surface and set the inclination angle to be, for example, less than 1 degree until just before the ground contact. The smaller the tilt angle, the smaller the tilt angle of the grounded load receiving platform 3 with respect to the ground, and the easier loading and unloading of the load on the load receiving platform 3 is.

  And the extension part 41a of the compression arm 41 is in the attitude | position which protruded upwards rather than the load receiving stand 3 seeing from the side, the overlapping attitude | position, or the attitude | position protruded below as the compression arm 41 rotates. Change posture. Specifically, when the load receiving platform 3 is positioned at the floor surface height of the loading platform 1, the posture is projected upward, and when the descent starts, the projected posture is gradually changed to a posture that overlaps the base end panel 31, Immediately before the load receiving platform 3 comes into contact with the ground, the base panel 31 protrudes downward. By projecting the extending portion 41a downward, when the tip of the load receiving platform 3 is grounded, the extending portion 41a can be grounded while the proximal panel 31 is not grounded. Therefore, it is not necessary to separately provide a load receiving base grounding member on the lower surface side of the base end panel 31, and an increase in the thickness of the entire load receiving stand 3 can be prevented. Therefore, it is possible to prevent the departure angle α from being reduced (see FIG. 1). In the present embodiment, the link arm 4 is configured such that the compression arm 41 is positioned outside the lift arm 42, but the lift arm 42 may be configured outside. In this case, an extension portion may be provided at the tip of the lift arm 42.

  Further, as shown in FIG. 3A, the compression arm 41 and the lift arm 42 according to the present embodiment are each configured by a single bracket (arm bracket) 41M, 42M. The lift cylinder 5a is attached adjacent to the inner side in the vehicle width direction of the arm bracket 42M constituting the lift arm 42. By configuring the arm brackets 41M and 42M, the width of the link arm 4 on the left and right outer sides of the base end panel 31 can be reduced. Therefore, the width of the proximal end panel 31 can be increased.

  As shown in the figure, the lift cylinder 5a is pivotally supported at the tip end of the cylinder rod with respect to the fixed bracket 61a fixed to the cross frame 6a, and the cylinder tube side is attached to an intermediate portion of the arm bracket 42M. Since the proximal end panel 31 moves up and down on the distal end side of the lift arm 41 with respect to the middle portion, there is no interference even if the lift cylinder 5a is provided on the inner side in the vehicle width direction than the lift arm 42 (arm bracket 42M). With this configuration capable of avoiding interference, as shown in the plan view of FIG. 3B, the gap width W2 between the arm bracket 42M and the base end panel 31 can be made smaller than the outer diameter D1 of the lift cylinder 5a.

  Therefore, the lift cylinder 5a is provided with the direction from the proximal end portion of the link arm 4 toward the distal end portion as the longitudinal direction while effectively utilizing the space between the cross frame 6a and the load receiving platform 3 (base end panel 31). With this configuration, the size of the departure angle α can be secured, and the width of the load receiving platform 3 can be secured.

  In this embodiment, the link arm 4 constituting the non-parallel link mechanism is used. However, for example, a link arm constituting a well-known parallel link mechanism such as Japanese Patent No. 4815290 may be used. At this time, the bracket near the cross frame 6a on which the lift cylinder 5a is pivotally supported is configured to rotate with respect to the cross frame 6a with the vehicle width direction as the axial direction, and the bracket can be attached to and detached from the cross frame 6a. And When the link arm of this well-known parallel link mechanism is used, the load receiving platform lowered in a horizontal posture extends to the tip of the link arm (compression arm or lift arm) as described above at a position slightly away from the ground. Is grounded. Thereafter, the bracket close to the cross frame is pivoted toward and away from the vehicle rear side from the cross frame 6a, so that the tip of the load receiving table is lowered and the load receiving table is inclined. Even in this inclined state, the extended portion of the link arm is grounded. That is, it is not necessary to separately provide a material for grounding the cradle on the lower side of the base end panel, and similarly the reduction of the departure angle can be prevented.

  In addition, the link arm 4 forms a non-parallel link mechanism by providing the first pin P1 on the rear side of the vehicle with respect to the third pin P3. However, the first pin P1 is aligned with the third pin P3 in the vertical direction. In this way, the second pin P2 may be provided in front of the vehicle with respect to the fourth pin P4, and other modifications may be made as appropriate.

  The lift cylinder 5a is attached to the inside of the lift arm 42. However, when the lift arm 42 is provided outside and the compression arm 41 is provided inside, the lift cylinder 5a is provided with the compression arm 41. It is good also as a structure attached inside.

1 Vehicle 2 Loading platform 3 Loading platform 31 Base panel (loading platform)
32 Front panel (container)
31B Support bracket 310B Protrusion (support bracket)
4 Link arm 41 Compression arm 41a Extension part (compression arm)
42 Lift arms 411, 421 Middle part (link arm)
412, 422 Base end (link arm)
413, 423 Tip (link arm)
41M, 42M Arm bracket 5a Lift cylinder 5b Slide cylinder 6 Slide member RT Vehicle front wheel P1 First pin P2 Second pin (support portion)
P3 3rd pin P4 4th pin (support part)
100 Loading platform lifting device

Claims (4)

A pair of left and right chassis frames extending in the front-rear direction of the vehicle, a pair of left and right link arms supported at the base end of the frame and capable of rotating up and down, a hydraulic cylinder for driving the rotation of the arms, and the link A load receiving platform lifting device including a load receiving platform supported by a tip portion of an arm and stored below the loading platform of the vehicle,
The left and right end portions of the load receiving platform are supported by the distal end portion of the link arm,
The link arm is in a substantially horizontal state when the cargo cradle is stored,
The hydraulic cylinder is provided with respect to the link arm as a longitudinal direction from the base end to the tip .
The link arm includes two arm members,
Each arm member is composed of one arm bracket,
The hydraulic cylinder is attached to the arm bracket . The load receiving table elevating device according to claim 1, wherein a support portion of the link arm that supports the load receiving table is provided on a side surface of the load receiving table. The side surface portion of the load receiving platform includes a protruding portion protruding upward,
The link arm includes two arm members,
The support portion of one arm is provided on the protruding portion, and further provided above the other support portion.
The load receiving table lifting device according to claim 2 . The said hydraulic cylinder is attached in the state in which the cylinder rod or cylinder tube was pivotally supported by the said link arm. The load receiving stand raising / lowering apparatus of Claim 1 characterized by the above-mentioned.

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