JPH0812295A - Operating oil cooling structure for industrial vehicle - Google Patents

Abstract

PURPOSE:To improve the heat radiating effect of the operating oil so as to improve the operating oil cooling performance by forming an oil chamber, in which the operating oil is flown, in a fender provided in a car body so as to cover a part of a wheel, and providing a control valve, an oil tank and a pump in a hydraulic circuit communicated with this oil chamber. CONSTITUTION:In a fork lift as an industrial vehicle, each fender 4 for covering a front wheel from the upper part to the rear part thereof so as to prevent the splashes of mud is provided in both sides of the front part of a car body. Any one of right and left fenders 4 is formed into the double structure having an oil chamber inside thereof. A hydraulic circuit 15 for supplying the operating oil to a lift cylinder for operating a fork and a steering cylinder for steering the rear wheels is connected to an inlet 12 and an outlet 13 opened in the oil chamber 5. At the time of circulating the discharged oil of a pump 18 through a control valve 16, the operating oil is efficiently cooled by the fender 4, in which the outside air is flown by the rotation of the front wheels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic oil cooling structure for cooling hydraulic oil circulating in a hydraulic circuit in an industrial vehicle having a hydraulically driven cargo handling device.

[0002]

2. Description of the Related Art Conventionally, forks of forklifts, for example, are hydraulically driven, and hydraulic oil always circulates in a hydraulic circuit when the engine is rotating.

[0003]

However, in the above-mentioned conventional type, if the hydraulic oil constantly circulates in the hydraulic circuit,
There has been a problem that the temperature of the hydraulic oil becomes high due to piping resistance and the like, which deteriorates the hydraulic oil itself and adversely affects hose and seals for piping.

The present invention solves the above problems, and an object of the present invention is to provide a hydraulic oil cooling structure for an industrial vehicle which can cool the hydraulic oil circulating in a hydraulic circuit with a simple structure. .

[0005]

In order to solve the above problems, a hydraulic oil cooling structure for an industrial vehicle according to the present invention is provided with a fender which covers a part of a wheel in a vehicle body, and in the fender, An oil chamber in which hydraulic oil flows is formed, an inlet and an outlet communicating with the oil chamber are provided in the fender, and a hydraulic circuit connected to the inlet side and the outlet side is formed. A control valve located on the side, an oil tank located on the outlet side, and a pump for circulating hydraulic oil are provided.

[0006]

According to the above construction, the hydraulic oil circulates in the hydraulic circuit by the pump. At this time, the hydraulic oil flowing out of the control valve flows into the oil chamber through the inlet, passes through the oil chamber through the outlet, and passes through the oil tank. Return to inside. Here, since the fender has a large contact area with the outside air and the outside air is circulated by the rotation of the wheels, the operating oil is sufficiently radiated and cooled in the oil chamber.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a forklift truck, which is an example of an industrial vehicle, and fenders 4 that cover the front wheels 3 from the upper side to the rear side are provided on both sides of the front portion of the vehicle body 2 to prevent spattering. Each of the fenders 4 is formed in an arc shape, and one of the left and right fenders 4 is formed in a double structure having an oil chamber 5 inside.

That is, the one side fender 4 is provided continuously between the outer plate portion 7 and the inner plate portion 8 and the outer plate portion 7 and the inner plate portion 8 which are vertically opposed to each other and have an arc shape. And a pair of left and right side plate portions 9 and a pair of front and rear end plate portions 10 connected continuously between the front and rear ends of the outer plate portion 7 and the inner plate portion 8 are formed in a hollow shape. Are formed. An inlet 12 communicating with the oil chamber 5 is formed in the upper portion of the inner plate portion 8,
An outlet 13 communicating with the oil chamber 5 is formed in the lower portion of the outer plate portion 7.

At the inlet 12 and the outlet 13, a hydraulic circuit 15 for supplying hydraulic oil to a lift cylinder (not shown) for operating the fork 14 and a steering cylinder (not shown) for changing the direction of the rear wheels 6 is provided. Are connected. The hydraulic circuit 15 is provided with a control valve 16 located on the inlet 12 side, an oil tank 17 located on the outlet 13 side, and a hydraulic pump 18 for circulating operating oil.

The control valve 16 controls the lift cylinder and the steering cylinder,
The outlet of the control valve 16 and the inlet 12 are connected via a hose 19 for piping. The oil tank 17 is supported by the vehicle body 2 and is located behind the fender 4, and the oil tank 17 and the outlet 13 are connected via a return pipe 20. Further, the oil tank 17 and the pump 18 are connected via a suction pipe 21.

The operation of the above structure will be described below.
The pump 18 operates by driving the engine, and the working oil circulates in the hydraulic circuit 15 from the inside of the oil tank 17 through the suction pipe 21. At this time, the hydraulic oil flowing out from the control valve 16 flows into the oil chamber 5 from the inlet 12 and
Through the outlet 13 to return to the oil tank 17 again.

The fender 4 has a large contact area with the outside air, and the outside air is circulated by the rotation of the front wheel 3, whereby the working oil is sufficiently radiated and cooled in the oil chamber 5. Therefore, the hydraulic oil can be prevented from reaching a high temperature with a simple structure, so that the hydraulic oil itself can be prevented from deteriorating and further hose for pipes and seals can be prevented from being adversely affected.

In the above embodiment, fins may be provided in a part of the fender 4 in order to further improve the cooling effect of the hydraulic oil. Although the forklift 1 is described as an example of the industrial vehicle in the above embodiment, the forklift 1 is not limited to the forklift 1 and may be a wheel loader or a skid steer loader.

Another embodiment of the present invention will be described below with reference to FIGS. 4 and 5. The fender 30 is composed of a conventional arc plate-shaped fender body 31 and a dish 32 attached to the inner surface of the fender body 31. This dish 32
Is an arc-shaped bottom wall 33, a pair of left and right side walls 34a, 34b raised from both left and right sides of the bottom wall 33, and a pair of front and rear end walls 35a, 35b raised from both front and rear sides of the bottom wall 33. And are formed in a box shape with an open top. The dish body 32 is attached to the inner surface of the fender body 31 with the bottom wall 33 facing down, so that the oil chamber 5 surrounded by the dish body 32 and the fender body 31 is formed.

An inlet 12 communicating with the oil chamber 5 is formed in the front portion of the side wall 34a of the dish 32, and an outlet 13 communicating with the oil chamber 5 is formed in the rear portion of the fender main body 31. .
A hydraulic circuit 15 is connected to the inlet 12 and the outlet 13 as in the first embodiment, and the hydraulic circuit 15 is provided with a control valve 16, an oil tank 17, and a hydraulic pump 18. There is.

According to this, the dish bodies 32 are mass-produced in advance, and the dish bodies 32 are attached to the conventional arc-shaped fender body 31.
The double structure fender 30 having the oil chamber 5 inside can be easily manufactured only by mounting the fender 30 inside. Therefore, the number of steps required to manufacture the fender 30 can be reduced. Also, before attaching the dish 32 to the fender body 31,
By thoroughly washing the inside of the dish 32 in advance, it is possible to reduce the washing in the oil chamber 5 after the dish 32 is attached to the fender main body 31.

In the above embodiment, fins may be provided in a part of the fender 30 in order to further improve the cooling effect of the hydraulic oil.

[0018]

As described above, according to the present invention, the hydraulic oil circulates in the hydraulic circuit by the pump, but at this time, the hydraulic oil flowing out from the control valve flows into the oil chamber from the inlet and flows from the oil chamber. Pass through the outlet and return to the oil tank. Here, since the fender has a large contact area with the outside air and the outside air is circulated by the rotation of the wheels, the operating oil is sufficiently radiated and cooled in the oil chamber. Therefore, since the hydraulic oil can be prevented from reaching a high temperature with a simple structure, it is possible to prevent the hydraulic oil itself from deteriorating.
It is possible to prevent hose and seals for piping from being adversely affected.

[Brief description of drawings]

FIG. 1 is a perspective view of a hydraulic oil cooling structure for an industrial vehicle according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a fender having the same hydraulic oil cooling structure.

FIG. 3 is a side view of a forklift truck, which is an example of an industrial vehicle.

FIG. 4 is a perspective view of a hydraulic oil cooling structure for an industrial vehicle according to another embodiment of the present invention.

FIG. 5 is a partially cutaway side view of a fender having the same hydraulic oil cooling structure.

[Explanation of symbols]

 1 Forklift (industrial vehicle) 2 Body 3 Front wheel 4 Fender 5 Oil chamber 12 Inlet 13 Outlet 15 Hydraulic circuit 16 Control valve 17 Oil tank 18 Pump 30 Fender

Claims (1)

[Claims] 1. A fender for covering a part of a wheel is provided on a vehicle body, an oil chamber in which hydraulic oil flows is formed in the fender, and an inlet and an outlet communicating with the oil chamber are formed in the fender. A hydraulic circuit connected to the inlet side and the outlet side is formed, and a control valve located on the inlet side, an oil tank located on the outlet side, and a pump for circulating hydraulic oil are provided in the hydraulic circuit. A hydraulic oil cooling structure for an industrial vehicle, characterized by being provided with.