JP2524909Y2 - Dump truck oil reservoir - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an oil reservoir fixed to a hydraulic cylinder for tilting a cargo box of a dump truck.

(Prior Art) Conventionally, as an oil reservoir of a dump truck, an oil reservoir is fixed to a hydraulic cylinder interposed between a vehicle body frame and a packing box to tilt the packing box, and the oil reservoir is a piston chamber of the hydraulic cylinder. The pipes are connected to the pumps connected to the hydraulic cylinders, the pipes are connected to the rod chambers of the hydraulic cylinders, and the open ends of these pipes connected to the oil reservoir are arranged close to each other, and the oil reservoir is connected to the hydraulic cylinder. It was arranged so that it was always located in the oil even if the oil level changed due to the inclination.

(Problems to be Solved by the Invention) However, in the above-described conventional apparatus, since each open end of the pipe is disposed close to each other, air flows into the oil reservoir through the pipe from the rod chamber side of the hydraulic cylinder to the oil reservoir. If mixed, this air may be supplied to the pump via the pipe while being mixed with the oil, and the oil flowing from the pump side into the oil reservoir via the pipe may suddenly flow toward the oil level. As a result, the air in the oil reservoir is entrained and supplied to the rod chamber side of the hydraulic cylinder. As described above, when air is mixed with oil, a severe vertical vibration is applied to a packing box or the like, and there is a problem that it is dangerous.

The present invention has been made in view of the above problems, and has as its object to provide an oil reservoir for a dump truck that prevents air from being mixed into oil supplied to a hydraulic cylinder and smoothly tilts a packing box. .

(Means for Solving the Problems) In the oil reservoir of the dump truck according to the present invention, a hydraulic cylinder is interposed between a vehicle body frame and a packing box which is tiltably mounted on an upper portion thereof, and a load is generated by the expansion and contraction of the hydraulic cylinder. In the dump truck in which the box tilts, an oil reservoir that tilts with the hydraulic cylinder in accordance with the expansion and contraction of the hydraulic cylinder is fixed to a side of the hydraulic cylinder, and the oil reservoir is communicated with a piston chamber of the hydraulic cylinder. One end of the first pipe is connected to the pump, and one end of the second pipe is connected to the rod chamber of the hydraulic cylinder. The other end of the first pipe is located behind the oil reservoir when the hydraulic cylinder is retracted. The other end of the second pipe is inserted into the oil reservoir from an upper portion on the front side of the oil reservoir when the hydraulic cylinder is retracted. After being bent, it is bent and disposed above the open end of the first pipe, and the open ends of the first pipe and the second pipe are connected to the oil in the oil reservoir even when the hydraulic cylinder is extended and inclined. Inside the oil reservoir, and a rectifying member is disposed near the opening end of the first pipe in the oil reservoir, and the rectifying member shields a portion facing the opening end of the second pipe. The opening end of the second pipe and the first
Along with being disposed between the open end of the pipe, a portion at least opposite to the shielding portion is formed in the inlet,
The inside of the oil reservoir and the opening end of the first pipe communicate with each other through the inlet.

(Operation) Even if air is mixed into the oil flowing into the oil reservoir from the second pipe, the air is guided to the space inside the oil reservoir by the rectifying member to prevent the air from being mixed into the first pipe.
The oil flowing from the first pipe into the oil reservoir hits the flow regulating member and is smoothly guided into the oil reservoir, so that the oil in the oil reservoir is not disturbed.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 and 2 show the configuration of the oil reservoir of the dump truck according to the present invention.

In the figure, reference numeral 1 denotes a body frame of a dump truck, on which a frame 2 provided at the bottom of a packing box 3 is supported so as to be tiltable about a pivot 4.

A link mechanism 5 is interposed between the vehicle body frame 1 and the frame 2, and the link mechanism 5 connects the frame 2 and the packing box 3 to a pivot 4.
It is configured to tilt around.

The link mechanism 5 includes a hydraulic cylinder 6 and a link rod 7 each having a base end pivotally supported by the vehicle body frame 1 via a bracket 1a, and one end pivotally supported by the distal end of the link rod 7 and the other end. A link arm 8 pivotally supported by the frame 2 via a bracket 2a.
The rod end of the hydraulic cylinder 6 is pivotally supported at an intermediate portion of the link arm 8.

An oil reservoir 10 is fixed to the lower portion of the outer peripheral surface of the hydraulic cylinder 6. The other end of a first pipe 11 having one end connected to a pump (not shown) is connected to the oil reservoir 10. The other end of the second pipe 12 whose part is connected to the rod chamber of the hydraulic cylinder 6 is connected.

The other end of the first pipe 11 is connected to the lower part of the rear side surface of the oil reservoir 10 when the hydraulic cylinder 6 shown in FIG. 1 is retracted, and its open end 11a is as shown in FIG. Even when the hydraulic cylinder 6 is extended and the packing box 3 is tilted, it is arranged so as to be always located in the oil in the oil reservoir 10.

The other end of the second pipe 12 is inserted into the oil reservoir 10 from above the front side surface of the oil reservoir 10 when the hydraulic cylinder 6 shown in FIG.
The first pipe 11 is curved and disposed close to and above the open end 11 a of the first pipe 11, and the open end 12 a is always located in the oil in the oil reservoir 10.

Further, a rectifying member 15 is disposed in the oil reservoir 10 near the opening end 11a of the first pipe 11. The rectifying member 15 has a portion facing the open end 12a of the second pipe 12 disposed as a shielding portion 15a between the open end 12a of the second pipe 12 and the open end 11a of the first pipe 11. In addition, the rectifying member 15
At least the opposite side to the shielding part 15a is the inlet 1
The inside of the oil reservoir 10 and the open end 11a of the first pipe 11 are communicated through the inlet 16. That is, the opening end 11 of the first pipe 11 in the oil reservoir 10
The exchange of oil between a and the open end 12a of the second pipe 12 is performed through the introduction port 16.

Next, the operation of the oil reservoir of the dump truck configured as described above will be described.

First, when the packing box 3 is tilted from the running posture shown in FIG. 1, the switching valve (not shown) is switched to the up position and the pump is operated, so that the oil in the oil reservoir 10 flows through the first pipe 11 and the pump. The oil is supplied to the piston chamber of the hydraulic cylinder 6 and the oil in the rod chamber of the hydraulic cylinder 6 is returned into the oil reservoir 10 via the second pipe 12. As a result, the hydraulic cylinder 6 extends, lifts the packing box 3 upward through the link mechanism 5, and tilts the packing box 3 about the pivot 4 (see FIG. 2). Then, as described above, oil flows from the second pipe 12 through the oil reservoir 10 to the first pipe 11
In this case, the oil flowing from the second pipe 12 hits the shielding portion 15a of the rectifying member 15 facing the opening end 12a of the second pipe 12, and flows into the oil reservoir 10. For this reason, even if air is mixed in the oil flowing from the second pipe 12, the air hits the shielding portion 15a of the rectifying member 15 and is guided to the space inside the oil reservoir 10. Therefore, only the oil is supplied to the open end 11a of the first pipe 11 through the introduction port 16, so that the oil mixed with the air is supplied from the second pipe 12 to the first end.
The supply of oil containing air to the first pipe 11 can be prevented without being directly supplied to the pipe 11.

Next, when returning the packing box 3 from the tilted state shown in FIG. 2 to the running posture, when the switching valve is switched to the lowered position, the oil in the piston chamber of the hydraulic cylinder 6 becomes the first oil by the weight of the packing box 3.
While being returned to the oil reservoir 10 via the pipe 11,
The oil in the oil reservoir 10 is supplied to the rod chamber of the hydraulic cylinder 6 via the second pipe 12, the hydraulic cylinder 6 contracts, and the packing box 3 returns to the running posture. Then, as described above, the oil is supplied from the first pipe 11 through the oil reservoir 10 to the second pipe.
12, the open end 11 a of the first pipe 11
The oil flowing into the oil reservoir 10 from above flows into the oil reservoir 10 through the introduction port 16 while hitting the shielding portion 15a of the flow regulating member 15. Therefore, the oil from the first pipe 11 flows into the oil reservoir 10 smoothly. Therefore, the first pipe
Oil does not suddenly squirt into the oil reservoir 10 from the 11 and does not disturb the oil level in the oil reservoir 10. As a result, in a state in which air is entrained, oil is
There is no such thing as being supplied from a.

(Effects of the Invention) As described above, according to the present invention, a rectifying member is disposed near the opening end of the first pipe in the oil reservoir, and the rectifying member is connected to the opening end of the second pipe. An opposing part is disposed between the opening end of the second pipe and the opening end of the first pipe as a shielding part, and a part at least opposite to the shielding part is formed in the inlet. Between the open end of the first pipe and the open end of the second pipe in the oil reservoir through the oil reservoir and the open end of the first pipe through the oil reservoir. A direct connection between the open end of the second pipe and the open end of the second pipe, whereby a direct suction of the oil mixed with air into the first pipe or the second pipe is performed. It can be surely eliminated by blocking. For this reason, it is possible to prevent violent vibration caused by air being mixed into the hydraulic cylinder when the packing box is tilted, thereby improving safety.

[Brief description of the drawings]

1 and 2 show an embodiment of an oil reservoir of a dump truck according to the present invention, FIG. 1 is a side view showing an oil reservoir of the dump truck in a running posture, and FIG. 2 is a diagram showing an oil reservoir of a tilting dump truck. FIG. DESCRIPTION OF SYMBOLS 1 ... Body frame 3 ... Packing box 5 ... Link mechanism 6 ... Hydraulic cylinder 10 ... Oil reservoir 11 ... 1st piping 12 ... 2nd piping 15 ... Rectification member

Claims (1)

(57) [Scope of request for utility model registration] 1. A dump truck in which a hydraulic cylinder is interposed between a vehicle body frame and a packing box mounted on the upper part thereof so as to be tiltable, and the packing box is tilted by expansion and contraction of the hydraulic cylinder. , An oil reservoir that is inclined with the hydraulic cylinder in accordance with the expansion and contraction of the hydraulic cylinder is fixed, and the oil reservoir is connected to one end of a first pipe to a pump connected to a piston chamber of the hydraulic cylinder. One end of a second pipe is connected to the rod chamber of the hydraulic cylinder, and the other end of the first pipe is connected to a lower portion of the rear side of the oil reservoir when the hydraulic cylinder is retracted. The end is inserted into the oil reservoir from the upper portion of the front side surface of the oil reservoir when the hydraulic cylinder is retracted, and then bent and disposed close to above the open end of the first pipe. The first pipe and the second pipe
The open end of the pipe is disposed so as to be always located in the oil in the oil reservoir even when the hydraulic cylinder is extended and inclined, and a rectifying member is provided near the open end of the first pipe in the oil reservoir. The rectifying member is disposed such that a portion facing the open end of the second pipe is disposed between the open end of the second pipe and the open end of the first pipe as a shield, and An oil reservoir for a dump truck, wherein at least a portion on the opposite side is formed in an inlet, and the inside of the oil reservoir and the opening end of the first pipe communicate with each other through the inlet.