JPH04221228A - Working oil tank installation structure for industrial vehicle - Google Patents

Abstract

PURPOSE:To provide a working oil tank installation structure of an industrial vehicle with which the cooling effect for the working oil can be improved and the arrangement work for the hydraulic piping related to the working oil tank can be made simple. CONSTITUTION:A working oil tank 1 is formed on a separated body which is independent from the side plate 2 of a machine base frame. The working oil tank 1 is fixed, keeping a certain interval, through a tank bracket 3 for the outside surface of the side plate 2. Accordingly, an air flow space 4 is formed between the side plate 2 and the working oil tank 1, and the contact area of the working oil tank for the outside air is increased, and the cooling action for the tank is positively carried out by the air passing through the flow space. Further, a hydraulic piping 7 is arranged in the flow space on the outside of the side plate, and the arrangement work, etc., can be carried out from outside the side frame, and the piping is protected by the tank bracket.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial vehicle such as a forklift, and more particularly to a mounting structure for a hydraulic oil tank attached to a machine frame.

0002

[Prior Art] In a conventional forklift, a pair of left and right side plates forming the main body of the machine frame are
They extend parallel to each other in the front-rear direction with a fixed interval left and right. It is common for the hydraulic oil tank to be fixed to the outer surface of one of the side plates by welding or the like, or for the side plate itself to be integrally formed as one wall. The outer wall surface constitutes a part of the outer panel of the vehicle body.

[0003] By the way, the temperature of hydraulic oil used in cargo handling equipment such as lift cylinders, brakes, power steering, etc. increases considerably with repeated use, but cooling is usually done by heat radiation through the tank wall. Various proposals have been made to improve the heat dissipation effect. For example, one example is Japanese Utility Model Application Publication No. 1-78698. The hydraulic oil tank shown in the above-mentioned publication has a part of it protruding inward from the side plate of the machine frame, and a radiation fin is provided on the protruding end surface to utilize the airflow flowing in the engine room. The cooling effect is actively carried out.

0004

[Problem to be Solved by the Invention] However, the space between the left and right side plates is limited because the power train such as the engine and various functional parts are housed therein. When the configuration shown in the above-mentioned publication is adopted, problems may arise in air circulation. In addition, the hydraulic piping for the hydraulic oil tank is routed so that it passes inside the side plate, which is one of the causes of poor air circulation, and also makes the work of routing the hydraulic piping and maintenance work troublesome. Become.

[0005] The reason why hydraulic piping must be installed inside the side plate is that the outside wall of the hydraulic oil tank constitutes a part of the outer panel of the vehicle body, so it cannot be placed outside of that wall. Because the top surface of the oil tank is used as a step, placing the tank on the top surface requires a double structure, which increases the cost and makes the step height too high. These conditions are not limited to those in the above-mentioned publication, but apply to the conventional art in general.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a hydraulic oil tank mounting structure for an industrial vehicle that can enhance the cooling effect of the hydraulic oil and also allows easy handling of hydraulic piping. Its purpose is to.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the present invention is constructed as follows. That is, in the hydraulic oil tank mounting structure for an industrial vehicle according to the present invention, the hydraulic oil tank is formed as a separate body independent from the side plate of the machine frame, and the hydraulic oil tank is attached to the outer surface of the side plate with a tank bracket. An air circulation space is formed between the hydraulic oil tank and the side plate by fixing the hydraulic oil tank and the side plate at regular intervals, and the hydraulic piping is passed through this circulation space. This is a pipe protection member that covers the lower part.

[0008]

[Operation] Therefore, according to the hydraulic oil tank mounting structure of the present invention configured as described above, the air circulation space exists between the hydraulic oil tank and the side plate, so that the entire wall surface of the hydraulic oil tank is Since it can be used as a heat dissipation surface for the outside air, it is possible to efficiently cool the hydraulic oil. Additionally, hydraulic piping work or maintenance work can be easily performed outside the side plate. The hydraulic piping arranged using the circulation space is protected by a tank bracket.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. (Example 1) First, Example 1 shown in FIGS. 1 to 3 will be described. As shown in the figure, the hydraulic oil tank 1 in this embodiment is formed into a rectangular parallelepiped-shaped separate structure independent from the side plate 2 of the machine frame, and is fixed to the outer surface of the side plate 2 via the tank bracket 3. This forms an air circulation space 4 parallel to the longitudinal direction of the vehicle body between the outer surface of the side plate 2 and the inner wall surface 1a of the hydraulic oil tank 1. . Note that the outer wall surface of the hydraulic oil tank 1 constitutes a part of the outer panel of the vehicle body, as in the conventional case.

As shown in FIG. 1, the tank bracket 3 includes a pair of front and rear U-shaped bracket bodies 3a, and is fixed by welding to the upper and lower inner surfaces of horizontal pieces of the front and rear bracket bodies 3a. The upper and lower plates 3b and the ribs 3c reinforcing them form a substantially channel shape with the longitudinal direction extending in the front-rear direction. The vertical piece of the bracket body 3a is fixed to the inner wall surface 1a of the hydraulic oil tank 1 by welding, and the horizontal piece of the bracket body 3a, each end face of the plate 3b and the rib 3c is fixed to the outer surface side of the side plate 2 by welding. has been done. Note that the tank bracket 3 may have a rectangular cylindrical shape if necessary.

Furthermore, as shown in FIG. 2, the hydraulic oil tank 1
The hydraulic oil pumping piping 5, which is one of the main hydraulic pipings, has one end connected to the front lower part of the hydraulic oil tank 1, and extends through the front surface of the tank.
The other end is connected to a hydraulic pump 6. In this way, when the pumping piping 5 is connected to the front surface of the tank, the piping distance to the hydraulic pump 6 can be shortened, which is effective in reducing the piping resistance.

On the other hand, in consideration of the influence of the returning high-temperature hydraulic oil on the pumped-up oil, one end of the hydraulic oil return piping 7 is connected to the upper part of the rear side furthest from the hydraulic oil pumping port, and the other end is connected to the rear upper part farthest from the hydraulic oil pumping port. is connected to the tank port of control valve 8. Therefore, the hydraulic oil return piping 7 is installed using the circulation space 4, and specifically,
Piping is provided to pass through the channel of the tank bracket 3. That is, the lower plate 3b of the tank bracket 3, in particular, functions as a protection member for protecting the piping 7. In this embodiment, only the above-mentioned main pipes 5 and 7 are shown among the hydraulic pipes related to the hydraulic oil tank 1, but pipes other than the main pipes may be connected to the tank in the circulation space 4 as necessary. It is piped through the bracket 3.

In this embodiment, the hydraulic oil tank 1 is installed as described above. Therefore, the hydraulic oil tank 1 installed apart from the side plate 2 has a contact area with the outside air that is in close contact with the conventional side plate. It is larger than the type or integral type, and since the space between it and the side plate 2, that is, the circulation space 4 corresponds to the running direction, heat is effectively dissipated by the ventilation of this circulation space 4 when the vehicle is running. As a result, the cooling action of the hydraulic oil is performed efficiently.

[0014] Also, the hydraulic oil tank 1 is attached to the side frame 2.
The side plate 2
It becomes possible to carry out routing work or maintenance work on the piping 7 from the outside. Moreover, the hydraulic piping 7 is passed through and protected within a channel-shaped tank bracket 3 with a plate 3b disposed at the bottom thereof. As described above, according to the present embodiment, the piping 7 can be moved to the outside of the side plate 2, and as a result, the piping inside the engine room, which is inside the side plate 2, which was previously unavoidable, can be abolished. This not only improves ventilation to the radiator, but also facilitates maintenance work in the engine room and is effective in protecting the piping 7 from engine heat.

(Embodiment 2) Next, Embodiment 2 of the present invention will be explained based on FIG. 4. In this embodiment, the hydraulic oil tank 1 is attached to and detached from the side plate 2 using bolts 9. As shown in the figure, the pair of front and rear U-shaped bracket bodies 3a of the tank bracket 3 are welded to the inner wall surface 1a of the hydraulic oil tank 1, while the upper and lower plates 3b, which are long in the front and back direction, are attached to the outer surface of the side plate 2. bolts 9 with the horizontal pieces of the bracket body 3a placed on the plates 3b.
It is configured to be tightened and fixed, and can be removed as necessary.

Therefore, according to this embodiment, not only can the same effects as in the first embodiment described above be obtained, but also when the hydraulic oil tank 1 is damaged, the hydraulic oil tank 1 is This can be dealt with by replacement or repaired by removing the hydraulic oil tank 1 from the machine base. Furthermore, when transporting the machine frame, it is possible to remove the hydraulic oil tank 1 and transport it in a compact state.

[0017] In an industrial vehicle such as a forklift, a hydraulic oil tank 1 is installed on either the left or right side of the machine frame.
Although it is common to install a fuel tank on the opposite side, there is no problem in applying the technical idea of the present invention to this fuel tank.

[0018]

[Effects of the Invention] As detailed above, according to the present invention,
It is possible to provide a hydraulic oil tank mounting structure that can more actively cool the hydraulic oil than in the past. In addition, by arranging the hydraulic piping for the hydraulic oil tank between the side plate of the machine frame and the hydraulic oil tank, the handling and maintenance work can be performed from outside the side plate, making it possible to perform these operations. Simplification is achieved. Furthermore, the piping is protected by a mounting bracket for the hydraulic oil tank.

[Brief explanation of the drawing]

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

FIG. 2 is a plan view as well.

FIG. 3 is a rear front view as well.

FIG. 4 is a perspective view showing a hydraulic oil tank mounting structure for an industrial vehicle according to a second embodiment of the present invention.

[Explanation of symbols]

1 Hydraulic oil tank 2 Side plate 3 Tank bracket 4 Air circulation space 5 Pumping piping 7 Return piping

Claims (1)

[Claims] Claim 1: The hydraulic oil tank is formed as a separate body independent of the side plate of the machine frame, and the hydraulic oil tank is fixed at a constant interval to the outer surface of the side plate via a tank bracket. This creates an air circulation space between the hydraulic oil tank and the side plate,
A hydraulic oil tank mounting structure for an industrial vehicle, in which hydraulic piping is passed through the circulation space, and the tank bracket is a piping protection member that covers at least the lower side of the circulation space.