JP7627638B2 - Loading vehicle - Google Patents

Description

The present invention relates to a cargo handling vehicle with a tiltable cargo box, and in particular to improvements to its piping structure.

A cargo handling vehicle equipped with a tiltable cargo box via a subframe on a drivable chassis is known (see, for example, Patent Document 1). In this cargo handling vehicle, the cargo box has multiple hydraulic actuators, and hydraulic piping for driving these hydraulic actuators is connected to the subframe side and the cargo box side.

JP 2020-142601 A

However, in a conventional vehicle with a tiltable cargo box, as shown in FIG. 6, when the cargo box is horizontal, the intermediate hydraulic hose 150 at the rear of the subframe 104 may hang down below the lower end of the subframe 104 and interfere with the chassis parts. In a vehicle with a cargo box, the chassis is generally manufactured by the chassis manufacturer, and the body manufacturer mounts the subframe and the cargo box on the chassis to complete the vehicle. The body manufacturer must avoid the intermediate hydraulic hose 150 hanging down below the subframe 104 and interfering with the chassis parts, which may affect the running performance or damage the intermediate hydraulic hose 150 during running. Therefore, as a countermeasure, a square pipe may be attached to the lower part of the main frame of the subframe 104 to raise the height. However, the installation of this square pipe for raising the height does not contribute to improving the basic performance, but rather leads to a simple increase in weight and overall height of the vehicle, which deteriorates the productability. In addition, in the case of refuse trucks that have trash collection boxes, the impact is even greater because raising the height increases the height of the trash inlet on the trash collection box above the ground, which leads to a deterioration in workability when dumping collected materials.

The present invention was made in consideration of these points, and its purpose is to prevent the intermediate hydraulic hose from hanging down below the subframe, whether the cargo box is horizontal or at its maximum tilt, thereby suppressing interference between the chassis parts and the intermediate hydraulic hose.

To achieve the above objective, this invention matches the required hose attachment length as closely as possible between the horizontal position of the cargo box when traveling, etc., and the maximum tilted position of the cargo box when dumping, etc., so that the intermediate hydraulic hose does not hang down when in the traveling position.

Specifically, in a first aspect of the present invention, a vehicle suspension system includes a subframe provided on a chassis;
A cargo box tiltably mounted on the subframe via a tilt cylinder;
A hydraulic actuator provided on the container;
a hydraulic source for supplying high-pressure oil to the hydraulic actuator;
a hydraulic piping for circulating high-pressure oil between the hydraulic source and the hydraulic actuator,
The cargo box is configured to be tiltable around a tilting central axis at the rear end of the cargo box frame of the cargo box between a horizontal state and a maximum tilted state,
The hydraulic piping is as follows:
A subframe-side hydraulic pipe that is provided on the chassis and the subframe and does not move in accordance with the tilting of the cargo box;
A cargo box side hydraulic pipe provided on the cargo box and tilting together with the cargo box as the cargo box tilts;
an intermediate hydraulic hose that connects a terminal end of a first metal pipe of the subframe side hydraulic piping to a starting end of a second metal pipe of the cargo box side hydraulic piping located rearward of the terminal end, and changes shape in accordance with the tilting of the cargo box;
the intermediate hydraulic hose has a flexible portion, a first connection end portion made of metal provided at an end portion of the flexible portion on the side of the first metal pipe and connected to the terminal end portion of the first metal pipe, and a second connection end portion made of metal provided at an end portion of the flexible portion on the side of the second metal pipe and connected to the starting end portion of the second metal pipe,
The maximum tilting line connecting the second connection end and the axis of the tilting central shaft at the maximum tilting of the packing box is:
With respect to a reference line connecting the first connection end and the axis,
It is on the opposite side of a horizontal tilting line connecting the second connection end and the axis when the packing box is in a horizontal position.

According to the above configuration, by providing the horizontal tilt line and the maximum tilt line on opposite sides of the reference line, it is possible to reduce the difference between the hose attachment length required to connect the start end of the second metal pipe of the hydraulic piping on the cargo box side and the end end of the first metal pipe of the hydraulic piping on the subframe side when the cargo box is at its maximum tilt, and the hose attachment length required to connect the start end of the second metal pipe of the hydraulic piping on the cargo box side and the end end of the first metal pipe of the hydraulic piping on the subframe side when the cargo box is horizontal. As a result, even if the length of the intermediate hydraulic hose is set so that the intermediate hydraulic hose does not hang down below the subframe when the cargo box is horizontal, the intermediate hydraulic hose does not become short in length when the cargo box is at its maximum tilt, so that the sagging of the intermediate hydraulic hose can be easily suppressed. As a result, it is possible to suppress interference between the chassis parts and the intermediate hydraulic hose without adding parts to the subframe to raise the intermediate hydraulic hose as in the conventional case. In addition, according to the configuration of the first invention, by providing the horizontal tilt line and the maximum tilt line on opposite sides of the reference line, the intermediate hydraulic hose can be deformed in a balanced manner above and below the reference line when tilting the cargo box, and the behavior of the intermediate hydraulic hose can be easily controlled.

In a second aspect of the present invention, in the first aspect of the present invention,
The terminal end of the first metal pipe is inclined upward and rearward.

According to the above configuration, the first metal pipe does not move with the tilting of the cargo box, so the first connection end of the intermediate hydraulic hose always faces upward. Therefore, when the cargo box is tilted to its maximum, the flexible portion of the intermediate hydraulic hose is deformed into a large arch overall, and when the cargo box is horizontal, the flexible portion of the intermediate hydraulic hose arches from the first metal pipe (first connection end) toward the second metal pipe (second connection end), and then bulges downward again toward the second metal pipe (second connection end), so it is deformed into an S-shape. Therefore, when the cargo box is horizontal, the intermediate hydraulic hose is even less likely to sag below the subframe.

In a third aspect of the present invention, in the second aspect of the present invention,
The starting end of the second metal pipe is arranged so that when the cargo box is horizontal, it is lower than the ending end of the first metal pipe and overlaps with the subframe when viewed from the side of the vehicle.

The above configuration allows the flexible portion of the intermediate hydraulic hose to be reliably deformed into an S-shape when the cargo box is horizontal, making it even less likely that the intermediate hydraulic hose will sag below the subframe when the cargo box is horizontal.

In a fourth aspect of the present invention, in any one of the first to third aspects of the present invention,
The second metal extends downwardly of the packing box toward the starting end of the second metal pipe, and then is bent so as to extend toward the front of the packing box.

With the above configuration, the start end of the hydraulic piping on the cargo box side can be set to be horizontal when the cargo box is horizontal and tilted upward when the cargo box is tilted to its maximum extent, so that the intermediate hydraulic hose will not hang down below the start end of the second metal piping of the cargo box side hydraulic piping, which moves in conjunction with the tilting of the cargo box, regardless of the position of the start end.

As explained above, according to the present invention, the intermediate hydraulic hose can be prevented from hanging below the subframe whether the cargo box is horizontal or at its maximum tilt, and interference between the chassis parts and the intermediate hydraulic hose can be suppressed.

FIG. 2 is an enlarged side view showing the axis of the tilting central axis of the packing box when it is horizontal and its surroundings. FIG. 1B is a plan view of a main part corresponding to FIG. 1A. 1 is a side view showing a trash collection vehicle according to an embodiment of the present invention, in which a packing box is in a horizontal position. 1 is a side view showing a garbage collection vehicle according to an embodiment of the present invention when a packing box is tilted to the maximum (dumped). FIG. 1A and 1B show hydraulic piping related to a packing box, in which FIG. FIG. 2 is a simplified hydraulic circuit diagram of a refuse collection vehicle according to an embodiment of the present invention. FIG. 1B is a side view corresponding to FIG. 1A according to the prior art.

The following describes an embodiment of the present invention with reference to the drawings.

(Embodiment 1)
2 and 3 show a refuse collection vehicle 1 as a loading vehicle having a tiltable cargo box according to an embodiment of the present invention. The refuse collection vehicle 1 is equipped with a drivable chassis 2, a driver's cab 3, and a cargo box 10 mounted on the chassis 2 via a subframe 4 so as to be tiltable.

The packing box 10 in this embodiment is a packing box for collecting trash, and this packing box 10 is provided with a trash storage box 11 and a trash input box 12 that is rotatable around a pivot 13 at the upper rear end of the trash storage box 11. A trash loading device 9 is built into this trash input box 12, and trash input from a trash input port 14 by this trash loading device 9 is compressed and stored in the trash storage box 11.

As shown in FIG. 3, the packing box 10 can be tilted upward with the trash dump box 12 open to allow the trash inside the trash storage box 11 to be discharged.

A cargo box frame 15 extending in the front-rear direction is provided at the bottom of the cargo box 10. The cargo box 10 is configured to be tiltable around a tilting center axis 5 at the rear end of the cargo box frame 15 between a horizontal state (shown in FIG. 2) and a maximum tilted state (dump state shown in FIG. 3).

A subframe 4 is provided on the chassis 2 of the refuse collection vehicle 1. A shipping box 10 is tiltably mounted on this subframe 4 via a tilting cylinder 6 and a tilting link 7.

Although the detailed configuration is not shown, as shown in FIG. 5, in this embodiment, the garbage loading device 9 is a rotating plate type, and is equipped with a hydraulic actuator, a rotating cylinder 64 that rotates the garbage bin 12 to open and close it, a pushing cylinder 65 that drives the pushing plate between the pushing position and the return position, and a hydraulic motor 66 that rotates the rotating plate forward and backward.

A hydraulic pump 60 is provided on the chassis 2 as a hydraulic source that supplies high-pressure oil to the hydraulic actuator. The hydraulic pump 60 is driven by a power take-off device (PTO 62) that takes power from an engine 61 provided on the chassis 2.

And between the hydraulic pump 60 and the hydraulic actuator, a hydraulic pipe 8 is provided to circulate high-pressure oil.

For example, oil from the hydraulic pump 60 passes through the main control valve 63 on the subframe 4 side, then passes through the hydraulic piping 8 of this embodiment to the cargo box side control valve 67, which switches the oil to each actuator as appropriate and returns to the hydraulic oil tank 68.

Since the tilt cylinder 6 is located on the subframe 4 side, hydraulic oil is supplied from the main control valve 63 without passing through the cargo box side control valve 67.

As shown in FIG. 4, the hydraulic piping 8 is provided on the chassis 2 and the subframe 4, and includes subframe-side hydraulic piping 30 that does not move with the tilting of the cargo box 10, cargo box-side hydraulic piping 40 that is provided on the cargo box 10 and tilts together with the cargo box 10 with the tilting of the cargo box 10, and an intermediate hydraulic hose 50 that connects the end 31a of the first metal piping 31 of the subframe-side hydraulic piping 30 to the beginning 41a of the second metal piping 41 of the cargo box-side hydraulic piping 40 located rearward of the end 31a, and changes shape with the tilting of the cargo box 10.

As shown in FIG. 1A, the second metal piping 41 of this embodiment is composed of a horizontal tube 41b extending horizontally forward from the rear end of the cargo box frame 15, an elbow 41c, a J-shaped bent tube 41d extending directly downward from the elbow 41c, a coupler 41e, etc. In this way, the starting end 41a of the second metal piping 41 extends downward from the cargo box and then bends to extend forward of the cargo box. In addition, the starting end 41a of the second metal piping 41 is arranged so that when the cargo box 10 is horizontal, it is located lower than the terminal end 31a of the first metal piping 31 and overlaps with the subframe 4 when viewed from the side of the vehicle. The bent tube 41d may be composed of three components: a straight tube extending vertically, one elbow, and a straight tube extending forward and backward.

The intermediate hydraulic hose 50 has a flexible section 50a that is mainly made of rubber and is easily deformable, a first metal connection end 50b that is provided at the end of the flexible section 50a on the first metal pipe 31 side and connected to the end 31a of the first metal pipe 31, and a second metal connection end 50c that is provided at the end of the flexible section 50a on the second metal pipe 41 side and connected to the start end 41a of the second metal pipe 41.

As shown in FIG. 1A, the maximum tilt line BO connecting the second connection end 50c (B) of the hydraulic hose 50 and the axis O of the tilting central shaft 5 when the cargo box 10 is at its maximum tilt is on the opposite side of the horizontal tilt line AO connecting the second connection end 50c (A) and the axis O when the cargo box 10 is horizontal, relative to the reference line DO connecting the first connection end 50b (D) of the hydraulic hose 50 and the axis O.

In addition, in this embodiment, the angle β at maximum tilt between the reference line DO and the maximum tilt line BO is greater than the horizontal angle α between the reference line DO and the horizontal tilt line AO (β>α).

Furthermore, the end portion 31a of the first metal pipe 31 of the subframe side hydraulic pipe 30 is inclined upward toward the rear. And the flexible portion 50a of the intermediate hydraulic hose 50 is configured to rise upward in a mountain shape from the first metal pipe 31 (first connection end 50b) toward the second metal pipe 41 (second connection end 50c) when the cargo box 10 is horizontal, and then deform so as to hang down downward, and to deform in an upward mountain shape overall at maximum tilt.

Next, we will explain the operation of the garbage collection vehicle 1 according to this embodiment.

First, as shown in FIG. 6, in a conventional refuse collection vehicle, when the cargo box is tilted to its maximum extent, the flexible portion 150a (X) of the intermediate hydraulic hose 150 bulges upward significantly, and when the cargo box frame 115 is horizontal with respect to the subframe 104, the flexible portion 150a (Y) of the intermediate hydraulic hose 150 hangs down so as to bulge downward significantly, and hangs down below the underside of the subframe 104.

In conventional refuse collection vehicles, whether the box is horizontal or at its maximum tilt, the beginning of the second metal pipe 141 of the hydraulic piping on the box side and the second metal connection end 150c of the hydraulic hose 151 connected to the beginning of the second metal pipe 141 are located above the reference line DO connecting the first metal connection end 150b of the hydraulic hose 151 connected to the end of the first metal pipe 131 of the hydraulic piping on the subframe side and the axis O of the central axis of the tilting of the box.

However, in the refuse collection vehicle 1 of this embodiment, the horizontal tilt line AO when the cargo box 10 is horizontal and the maximum tilt line BO when the cargo box 10 is at its maximum tilt are located on opposite sides of the reference line DO, so that the difference between the hose attachment length required to connect the start end 41a of the second metal pipe 41 of the cargo box side hydraulic pipe 40 and the end end 31a of the first metal pipe 31 of the subframe side hydraulic pipe 30 when the cargo box 10 is at its maximum tilt and the hose attachment length required to connect the start end 41a of the second metal pipe 41 and the end end 31a of the first metal pipe 31 when the cargo box 10 is horizontal is small.

Furthermore, the first metal pipe 31 does not move with the tilting of the packing box 10, and the end of the intermediate hydraulic hose 50 on the first metal pipe side is always facing upward, so that when the packing box 10 is at its maximum tilt, the flexible portion 50a (X) of the intermediate hydraulic hose 50 is deformed into a large arch shape overall. When the packing box 10 is horizontal, the flexible portion 50a (Y) of the intermediate hydraulic hose 50 becomes arched from the first metal pipe 31 (first connection end 50b) toward the second metal pipe 41 (second connection end 50c) (arched portion in FIG. 1A), and then bulges downward again toward the second metal pipe 41 (second connection end 50c), so that it is deformed into an S-shape. Therefore, when the packing box 10 is horizontal, the intermediate hydraulic hose 50 is less likely to hang down below the subframe 4.

On the other hand, at maximum tilting as shown in FIG. 3, high-pressure oil is flowed from the main control valve 63 into the rotating cylinder 64 to open the garbage dump box 12, while high-pressure oil is also flowed into the tilting cylinder 6, tilting the garbage storage box 11 and discharging the garbage inside the garbage storage box 11. At this time, as shown by the two-dot chain line in FIG. 1A, the intermediate hydraulic hose 50 forms a convex portion that bulges significantly upward. Therefore, the intermediate hydraulic hose 50 does not become taut or sag as the cargo box 10 tilts.

In addition, the starting end 41a of the second metal piping 41 is horizontal when the cargo box 10 is horizontal and tilts upward when the cargo box 10 is tilted to the maximum, so that the flexible portion 50a of the intermediate hydraulic hose 50 can be reliably deformed into an S-shape when the cargo box 10 is horizontal. Furthermore, the starting end 41a of the second metal piping 41 is arranged so that when the cargo box 10 is horizontal, it is located lower than the terminal end 31a of the first metal piping 31 and overlaps with the subframe 4 when viewed from the side of the vehicle, so that the flexible portion 50a of the intermediate hydraulic hose 50 can be reliably deformed into an S-shape so that the intermediate hydraulic hose 50 does not hang down below the subframe 4 when the cargo box 10 is horizontal.

Therefore, in a vehicle having a tiltable cargo box 10 according to this embodiment, the intermediate hydraulic hose 50 can be prevented from hanging below the subframe 4, whether the cargo box 10 is horizontal or at its maximum tilt. As a result, interference between the chassis components and the intermediate hydraulic hose 50 can be suppressed.

Other Embodiments
The present invention may be configured as follows with respect to the above embodiment.

In other words, in the above embodiment, the loading vehicle is a refuse collection vehicle, but there is no particular limitation as long as the loading vehicle has a hydraulic actuator whose cargo box is driven by high-pressure oil from a hydraulic source on the chassis side and is tiltable.

Note that the above embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses.

1. Refuse collection vehicle (loading vehicle)
2. Chassis
3. Cab
4. Subframe
5. Tilt central axis
6 Tilting cylinder
7 Tilt link
8 Hydraulic piping
9. Refuse loading device
10. Packing box
11. Garbage collection box
12. Garbage bin
13 Rotating shaft
14. Garbage inlet
15. Packing box frame
30 Subframe side hydraulic piping
31 First metal pipe
31a Terminal portion
40 Cargo box side hydraulic piping
41 Second metal pipe
41a Starting end
50 Intermediate hydraulic hose
50a Flexible portion
50b First connection end
50c Second connection end
60 Hydraulic pump
61 Engine
62 Power take-off device
63 Main control valve
64 Rotating cylinder
65 Push-in cylinder
66 Hydraulic motor
67 Cargo box side control valve
68 Hydraulic oil tank
O Shaft center

Claims (4)

A subframe provided on the chassis;
A cargo box tiltably mounted on the subframe via a tilt cylinder;
A hydraulic actuator provided on the container;
a hydraulic source for supplying high-pressure oil to the hydraulic actuator;
a hydraulic piping for circulating high-pressure oil between the hydraulic source and the hydraulic actuator,
The cargo box is configured to be tiltable around a tilting central axis at the rear end of the cargo box frame of the cargo box between a horizontal state and a maximum tilted state,
The hydraulic piping is as follows:
A subframe-side hydraulic pipe that is provided on the chassis and the subframe and does not move in accordance with the tilting of the cargo box;
A cargo box side hydraulic pipe provided on the cargo box and tilting together with the cargo box as the cargo box tilts;
an intermediate hydraulic hose that connects a terminal end of a first metal pipe of the subframe side hydraulic piping to a starting end of a second metal pipe of the cargo box side hydraulic piping located rearward of the terminal end, and changes shape in accordance with the tilting of the cargo box;
the intermediate hydraulic hose has a flexible portion, a first connection end portion made of metal provided at an end portion of the flexible portion on the side of the first metal pipe and connected to the terminal end portion of the first metal pipe, and a second connection end portion made of metal provided at an end portion of the flexible portion on the side of the second metal pipe and connected to the starting end portion of the second metal pipe,
The maximum tilting line connecting the second connection end and the axis of the tilting central shaft at the maximum tilting of the packing box is:
With respect to a reference line connecting the first connection end and the axis,
A loading vehicle characterized in that it is located on the opposite side of a horizontal tilting line connecting the second connection end and the axis of the cargo box when the cargo box is in a horizontal position. 2. The cargo handling vehicle according to claim 1, wherein the terminal end of the first metal pipe is inclined upward and rearward. The loading vehicle according to claim 2, characterized in that the starting end of the second metal pipe is arranged so that, when the cargo box is horizontal, it is located below the ending end of the first metal pipe and overlaps with the subframe when viewed from the side of the vehicle. 4. The cargo handling vehicle according to claim 1, wherein the second metal pipe extends downwardly from the cargo box toward a starting end of the second metal pipe and is then bent so as to extend forwardly from the cargo box.

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