JPH0641879Y2 - Slide dump truck - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is capable of sliding up and down the tilting frame with a low tilt angle, and the front end of the packing box is retracted downward to the rear end of the tilting frame to move the rear end of the packing box. The present invention relates to a slide dump truck in which the front of the packing box falls down and the tilt angle becomes shallower when the tilt frame is set to a high tilt angle in a state where the tilt frame is grounded.

(Prior Art) In a slide dump truck, as described in Japanese Utility Model Laid-Open No. 64-51541, a tilting frame that is pivotally supported by a vehicle frame and can tilt is tilted at a low tilting angle and a loading box is slid up and down. There are two applications: low tilting angle operation for unloading and high tilting angle operation for tilting a tilting frame with a fixed packing box to a high tilting angle for use as a normal dump truck. In the low tilt angle operation, the packing box is retracted and lowered, and a step board is passed between the rear end of the packing box and the ground for loading and unloading.

(Problems to be solved by the invention) In general, the smaller the tilting angle is, the more convenient it is when unloading between the sloping load box and the ground. In the one described in the above publication, the luggage box only slides on the tilting frame and does not rotate, the tilting angle of the packing box is equal to the tilting angle of the tilting frame, and the tilting angle from the viewpoint of sliding function and safety. Is not as shallow as her husband. However, since the height of the vehicle frame, and therefore the proportion of the height of the tilt center and the total length of the cargo box is almost constant, there is a difference in height between the rear end of the lower surface of the cargo box and the ground, and it is necessary to use a walking board.
The work is complicated.

On the other hand, from the viewpoint of the safety of loading and unloading work, it is desirable to make the tilt angle shallower. However, if the angle is made shallower, the difference in height becomes larger, and therefore the step board must be made larger, which is disadvantageous.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes a tilting frame pivotally supported by a rear portion of a vehicle frame and tiltable to a high tilting angle, and a luggage box mounted on the tilting frame. However, the packing box is a slide dump truck which can be slid back and forth on the tilting frame when the tilting frame has a low tilting angle by a slide means mounted between the tilting frame and the packing box. A support portion, which is horizontally installed, is provided at the rear end of the tilting frame behind the tilt center so that the shaft of the luggage box can be engaged, and the relationship between the shaft and the support portion where the luggage box slides to the rear end of the tilting frame is provided. At the time of the merger, the rear end of the cargo box is in contact with the ground, the tilting frame tilts to a high tilting angle, and the front of the cargo box is laid down downward around the support part.

The sliding means is composed of two sets of hydraulic cylinders, one end of which is pivotally supported by the tilting frame and the luggage box, and the other ends of which are pivotally connected. When the luggage box slides to the rear end of the tilting frame, the two sets The center of the connecting portion of the hydraulic cylinder and the supporting portion are aligned with each other so that the luggage box can be laid down.

Further, the sliding means is characterized by comprising a pinion laterally provided at a front end of the luggage box and rotationally driven by a driving means, and a rack fixed to the tilting frame and meshing with the pinion.

Further, the sliding means is mounted on a tilting frame and is reciprocally driven, and a linear or flat plate-shaped moving body having engaged means, and an engagement which is mounted on a front end portion of the packing box and engages with the engaged means. It is characterized by comprising means.

(Operation) When the shaft laterally installed at the front end engages with the support part provided at the rear end of the tilting frame, or when the center of the connecting part of the hydraulic cylinder also coincides, the load box falls over the tilting frame. It will be possible.
When the rear end of the cargo box is grounded at a low tilt angle and the tilt frame is set at a high tilt angle, the cargo box is laid down and the tilt angle becomes shallower.

(Example) An example will be described with reference to the drawings.

As shown in FIG. 1, the slide dump truck 1 has a tilting center 5 which allows the vicinity of the rear end of the tilting frame 3 to tilt on the rear end of the vehicle frame 2.
Is pivoted 5a, and a luggage box 4 is mounted on the tilting frame 3. The tilting of the tilting frame 3 is performed by a hydraulic cylinder 6 for dumping, as shown in FIGS.

The tilting frame 3 can be tilted to a high tilting angle θ ₂ , that is, can be dumped, and is also used as a normal dump truck for loading and discharging earth and sand by a high tilting angle operation (not shown) with the packing box 4 fixed. The high tilting angle θ ₂ is usually about 50 to 55 due to the discharging function.

Another use of the slide dump truck 1 is low tilt angle operation. As shown in FIG. 4, the tilting frame 3 is set to a low tilting angle θ ₁ , and the luggage box 4 is slid and lowered backward as shown in FIG. 5, and the rear end of the luggage box 4 is grounded via the ground roller 8. Let Reference numeral 7 denotes a jack, which is brought into contact with the ground while lowering the tilt angle in order to prevent accidental lifting of the front wheels.

In the present invention, the packing box 4 can be laid down on the tilting frame 3. As shown in FIG. 6, the tilting frame 3 is tilted from the state in which the rear end of the packing box 4 shown in FIG. The tilt angle is made shallower and the accident vehicle is loaded and unloaded.

FIG. 2 shows the AA cross section of FIG. The lower frame 9 of the luggage box is fixed to the left and right lower surfaces of the luggage box 4, and the slide portion 9a forming the lower portion thereof is guided by the guide groove 3b forming the upper portion of the tilting frame 3 to slide. To make the slide smooth,
Pads 16 having a lubricating function are provided at the portions of the tilting frame 3 facing the lower surface of the slide portion 9a and the upper surface of the slide portion 9a facing the upper side of the guide groove 3b. The slide part
Instead of 9a, a guide wheel may be rolled.

At the front end of the packing box, shafts 10 are horizontally provided from the center of the left and right packing box lower frames 9 in the height direction. FIG. 3 is a vertical sectional view of a portion B of FIG. 1, showing a case where the shaft 10 of the slid luggage box 4 is engaged with the stopper 11. A plate-shaped stopper 11 for the slide of the luggage box 4 is fixed to the rear end of the tilting frame 3,
The axis 10 can be inserted into 11 when the packing box 4 is retracted,
A support portion 12 formed by a ⊃ groove that also serves as a stopper and a rotation guide for the shaft 10 is opened. The position of the center when the shaft 10 comes into contact with the bottom of the support 12 and rotates will be referred to as the center of the support 12.

Sliding means for sliding the luggage box 4 back and forth is mounted between the tilting frame 3 and the luggage box 4. As an example, as shown in FIG. 7 to FIG. 9, a case where each pair of hydraulic cylinders 13 and 14 is used will be described.

A tail end which is one end of the hydraulic cylinder 13 is pivotally supported 13a on the upper front side of the tilting frame 3, and a tail end which is one end of the hydraulic cylinder 14 is pivotally supported 14a on the lower rear side of the luggage box 4. Rod ends, which are the other ends, are pivotally attached to each other to form a connecting portion 15 rotatable about a horizontal axis.

In the traveling state shown in FIGS. 1 and 7, the hydraulic cylinders 13 and 14 are contracted in order to store the tilting frame 3 and the packing box 4. In the traveling state, the pivot 14a of the hydraulic cylinder 14 is arranged so as to coincide with the center of the support 12.

As a slide procedure, first, as shown in FIG. 8, the hydraulic cylinder 13 is extended. At this time, the connecting portion 15 is arranged so as to coincide with the position where the pivot point 14a of the hydraulic cylinder 14 in the traveling position in the extended position was, that is, the center of the supporting portion 12.

Next, the hydraulic cylinder 14 is extended as shown in FIG.
The connecting portion 15 does not move, and only the body of the hydraulic cylinder 14 and the luggage box 4 retract. The shaft 10 provided laterally at the front end of the luggage box 4 is retracted to the position of the connecting portion 15, that is, the position corresponding to the center of the supporting portion 12. In this state, as shown in FIG. 5, the ground roller 8 mounted on the rear end of the luggage box 4 is grounded.

In the state shown in FIG. 5 and FIG.
It becomes possible to lie down with respect to the tilting frame 3 around. On the other hand, the hydraulic cylinders 13 and 14 can always rotate about the horizontal axis about the connecting portion 15, but normally, since the packing box 4 is on the tilting frame 3, the hydraulic cylinders must rotate. I can't.

In the state shown in FIGS. 5 and 9, the connecting portion 15 has the supporting portion 12
Since it coincides with the center of the
That is, the rotation and the rotations of the hydraulic cylinders 13 and 14 can be performed simultaneously around the support portion 12. Therefore, in contrast to the tilting frame 3 having the hydraulic cylinder 13 pivotally supported 13a, the load box 4 having the hydraulic cylinder 14 pivotally supported 14a has the support portion 1 at the rear end of the tilting frame 3.
Rotation around 2 is possible.

Since the rear end of the packing box 4 is grounded, when the hydraulic cylinder 6 is further extended to increase the tilting angle of the tilting frame 3 as shown in FIG. 6, the packing box 4 tilts around the supporting portion 12. When the tilting angle of the tilting frame 3 becomes a high tilting angle θ ₂ , the front of the packing box 4 is laid down and the tilting angle becomes shallower.
Is a shallow tilt angle θ _{3 that} is shallower than the low tilt angle θ ₁ .
Therefore, loading and unloading work becomes extremely easy and safe. To return to the running state, the operation reverse to the above may be performed.

In the running state, the pivot point 14a is aligned with the support portion 12 as shown in FIG. 7, and when the hydraulic cylinder 13 is extended, the connection portion 15 is aligned with the support portion 12 as shown in FIG. When the cylinder 14 is extended, the shaft 10 is aligned with the supporting portion 12 as shown in FIG. 9 because the sum of the lengths of the hydraulic cylinders 13 and 14 with respect to the length of the packing box 4 is the minimum, that is, This is to make it smaller.

FIG. 10 shows another embodiment in which a hydraulic cylinder is used. When the hydraulic cylinder 13 is used, the distance between the shaft 10 and the pivot point 14a is equal to the sum of the extension amounts of the hydraulic cylinders 13 and 14, so the pivot point 13a is located in front of the shaft 10 in the traveling state. Since the front end of the luggage box 4 is retracted from the front end of the tilting frame 3, the overall length of the luggage box 4 becomes short, which is disadvantageous.

In order to avoid this, instead of the normal hydraulic cylinder 13, a telescopic hydraulic cylinder 16 whose extension amount is longer than the main body length is used so that the pivot point 16a is near the axis 10 so that the total length of the packing box 4 does not become short. ing.

In another embodiment shown in FIG. 11, a telescopic hydraulic cylinder 16
2 sets of normal hydraulic cylinders 17 are used instead of
The position a is almost the same as the pivot point 16a. Hydraulic cylinder
A normal hydraulic cylinder 18 is used instead of 14, and the connection between the hydraulic cylinders 17 and 18 is such that the body of the hydraulic cylinder 18 is pivotally attached to a pivot shaft 19 that connects rod ends of the hydraulic cylinder 17 in the vehicle width direction. To do. Although two sets of hydraulic cylinders 17 are used, since the structure is normal, maintenance is easier than when one set of telescopic hydraulic cylinders 16 is used.

FIG. 12 shows a case where a pinion 20 provided at the front end portion of the luggage box 4 as a sliding means is engaged with a rack 21 fixed to the tilting frame 3. FIG. 13 shows a cross section taken along the line C--C in FIG. 12, in which the rack 21 is fixed to the lower part of the left and right tilting frames 3 and is horizontally driven by the driving means 23 mounted on the lower surface of the luggage box 4. Pinions 20 are fitted on both sides of the shaft 22 and mesh with the rack 21. The shaft 10 and the supporting portion 12 are provided at the same positions as in the case of FIG.

FIG. 14 is a partially enlarged view of a case where a simple tooth profile pinion 24 is used in place of the pinion 20 in FIG. 12, and the tooth profile has a trapezoidal simple shape to facilitate manufacturing.

FIG. 15 shows, in place of the rack 21 in FIG. 12, the meshing pins 25 arranged in a ladder shape instead of the rack tooth shape.

FIG. 16 shows still another embodiment, which is a belt 26 mounted on the tilting frame 3 and reciprocally driven by driving wheels 29 and driven wheels 30 at both ends, and engaged means 27 provided on the belt 26. And an engaging means 28 which is provided at the front end of the luggage box 4 and engages with the engaged means 27. The engaged means 27 is a belt
26 Reciprocates slightly behind the drive wheel 30 on the upper surface and slightly ahead of the driven wheel 30.

Instead of the flat-shaped moving body such as the belt 26, a linear shape such as a chain or a wire may be used. Alternatively, the endless belt may be wound, and both ends may be wound. The shaft 10 and the supporting portion 12 are at the same positions as in the case of FIG.

(Effect of the invention) The packing box can be laid down with respect to the tilting frame. With the tilting frame set to a low tilting angle, the packing box moves backward and descends, the rear end is grounded, and then the tilting angle of the tilting frame is increased. When the tilt angle is set, the tilt angle of the packing box becomes shallower than the initial low tilt angle. Therefore, the unloading work becomes extremely easy and safe. It is possible to maximize the length of the packing box by selecting the sliding means.

[Brief description of drawings]

FIG. 1 is a side view of a slide dump truck, FIG. 2 is a sectional view of FIGS. 1A to 1A, FIG. 3 is an explanatory view showing an engaged state of a shaft and a support portion, and FIG. 4 is a side view in a low tilt angle state. Fig. 5 is a side view of the cargo box with the tilt angle lowered and landed backward, and Fig. 6 is a side view of the tilt frame with a high tilt angle and the cargo box with a shallow tilt angle. Figs. 7, 8 , FIG. 9 is an operation sequence explanatory diagram of the hydraulic cylinder, FIGS. 10 and 11 are explanatory diagrams showing other embodiments of the hydraulic cylinder, and FIGS. 12 to 15 are explanatory diagrams in the case of using a pinion. First
13 is a sectional view taken along line C-C in FIG. 12, FIG. 16 is an explanatory diagram when a belt is used, and FIG. 17 is a sectional view taken along line D-D in FIG. 1 ... slide dump truck, 2 ... car frame, 3 ... tilting frame, 4 ...
Packing box, 5 ... Tilting center, 10 ... Shaft, 12 ... Support part, 13,14,16,1
7,18 ... hydraulic cylinder, 15 ... connecting part, 20 ... pinion, 21 ...
Rack, 23 ... Driving means, 26 ... Belt, 27 ... Engaging means, 28
... engaged means, θ ₁ ... low tilt angle, θ ₂ ... high tilt angle.

Claims (4)

[Scope of utility model registration request] 1. A tilting frame pivotally supported on a rear portion of a vehicle frame and capable of tilting to a high tilting angle, and a luggage box mounted on the tilting frame,
The loading box is a slide dump truck that can be slid back and forth on the tilting frame when the tilting frame has a low tilting angle by a sliding means mounted between the tilting frame and the loading box. Then, at the rear end of the tilting frame behind the tilting center, there is provided a support part capable of engaging the shaft of the luggage box, and when the shaft is slid to the rear end of the tilting frame and the supporting part is engaged. A slide dump truck characterized in that the rear end of the luggage box is in contact with the ground, the tilting frame is tilted to a high tilt angle, and the front of the luggage box is laid down downward with the support portion as the center. 2. The sliding means comprises two sets of hydraulic cylinders, one end of which is pivotally supported by the tilting frame and the luggage box, and the other end of which is pivotally connected to each other. When the luggage box slides to the rear end of the tilting frame, The slide dump truck according to claim 1, wherein a center of a connecting portion of the two sets of hydraulic cylinders and the supporting portion are aligned with each other so that the load box can be laid down. 3. The sliding means comprises a pinion provided laterally on the front end of the luggage box and rotationally driven by a driving means, and a rack fixed to a tilting frame and meshing with the pinion. Item 1. A slide dump truck according to item 1. 4. The sliding means is mounted on a tilting frame and is reciprocally driven, and a linear or flat plate-shaped moving body having engaged means and a front end of a packing box are engaged with the engaged means. The slide dump truck according to claim 1, wherein the slide dump truck comprises an engaging means for