JP2890923B2 - Hydraulic piping structure for tilt cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic piping structure for connecting an oil control valve of a forklift to a tilt cylinder.

[0002]

2. Description of the Related Art FIG. 3 illustrates a conventional hydraulic piping structure for connecting an oil control valve and a tilt cylinder. As shown, the oil control valve 3
3 is disposed on the lower surface side of the toe board 32 placed on the body frame 31, and the two tilt pipes 34 connected to the oil control valve 33 once turn to the lower part of the oil control valve 33, It extends between the side surface and the steering gear box 35 and extends on the toe board 32, and the front protector 3
6, it branches right and left at the center of the rear surface, and extends horizontally laterally along the lower portion of the rear surface of the front protector 36. It is near. On the other hand, each of the two tilt hoses 38 connected to the outer surface of the tilt cylinder 37 (the outer surface of the machine base) forms a substantially semicircular loop above and below the tilt cylinder 37 for absorbing vertical tilt. , Extending toward the inner surface side (machine center side), and connected to the branch end of the tilt pipe 34 at that position. An example in which the tilt pipe 34 is provided on the toe board 32 and along the lower portion of the rear surface of the front protector 36 is, for example, Japanese Utility Model Laid-Open No. 63-63294.

[0003]

However, in the case of the above-mentioned conventional hydraulic piping structure, there is a problem in that it is difficult to connect the tilt pipe 34 and the tilt hose 38 via the fitting 39. That is,
As is well known, although not shown, a steering post 40 is provided on the rear surface of the front protector 36.
There are pedals such as an accelerator pedal, a brake pedal, a clutch pedal, and a lift lever and a tilt lever 41 for operating the oil control valve 33, and also for traveling forward and backward and switching between high and low speeds. The levers such as a shift lever and a parking brake lever are arranged.

[0004] The connection work between the tilt pipe 34 and the tilt hose 38 is generally performed from the rear side of the front protector 36 after such a large number of functional parts are assembled at predetermined positions. The presence of the functional component hinders entry of a torque wrench or the like, which is a suitable tool for the connection work, or hinders free operation. for that reason,
In the past, connection work was performed using a specially manufactured small simple tool, but with this, it was not possible to tighten with an appropriate torque like a torque wrench, and as a result, oil leakage due to poor tightening or pipes due to excessive tightening This causes problems such as bending and cracks. Such poor workability is the same not only at the time of new assembly but also at the time of replacement of piping parts due to aging.

In view of the above problems, the present invention is to solve the problem of improving the workability of the connection work by allowing the work of connecting the tilt pipe and the tilt hose to be performed from the front side of the front protector. Technical issues.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, a hydraulic piping structure for connecting an oil control valve arranged and fixed on the lower surface side of the toe board and left and right tilt cylinders installed on both right and left sides of the vehicle body frame, one end of which is connected to the oil control valve. The connected tilt pipe extends upward along the rear surface of the front protector through the toe board and branches right and left near the upper end of the front protector, and one end of the tilt hose connected to the tilt cylinder is connected to the tilt hose. At the top of the cylinder, it extends upward so as to have an appropriate loop, and further extends toward the center along the upper rear surface of the front protector, and its end is connected to the branch end of the tilt pipe. The tilt pipe and tilt are located at the upper center of the front protector. Notch provided with a as a connecting operation of the over scan, is characterized in that detachably attached a cover for covering the same notch in the front protector.

[0007]

In the hydraulic piping structure according to the present invention constructed as described above, the work of connecting the tilt pipe and the tilt hose, that is, the work of tightening the fitting, is performed through the notch provided at the upper end of the front protector. This can be done from the front side of the protector. Then, after the connection work, the notch is closed by the cover, thereby achieving protection of the piping including the connection portion between the tilt pipe and the tilt hose.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. As shown in FIG. 1, a front protector 2 is provided on the upper front end of the vehicle body frame 1, thereby covering the front surface and the left and right side surfaces of the vehicle body. As shown in FIG. 2, an instrument panel 3 is detachably attached to an upper surface portion of the front protector 2 by bolts (not shown), and the instrument panel 3 is generally mounted on the front protector portion. This is performed at the final stage of the assembly work.

A toe board 4 is horizontally mounted on the left and right body frames 1, and an oil control valve 5, which is one of the piping objects, is arranged on the lower surface of the toe board 4 as shown by a dotted line in FIG. Have been. The left and right tilt cylinders 10, which are the other piping objects, are disposed substantially horizontally on the left and right upper surfaces of the body frame 1 on the inner side of the front protector 2.

[0010] Two tilt pipes 6 are connected to the rear side of the oil control valve 5 through fittings 7. The tilt pipe 6 extends between the oil control valve 5 and the steering gear box 8 disposed below the toe board 4 in parallel to the left and right from a notch 4 a formed in the toe board 4. . Further, the tilt pipe 6 extends upward along the rear surface of the front protector 2 and then branches right and left through a three-way 9 near an upper end portion of the front protector 2 and, at the same time, extends sideways vertically. Has been extended to.

The left and right tilt cylinders 10
Has a base end rotatably attached to the vehicle body frame 1 via a bracket 11 by a pin 12, and a front end portion thereof projects forward through a front part of the front protector 2. It is pivotally attached to the omitted mast. Two tilt hoses 13 for the bottom-side oil chamber and for the rod-side oil chamber are respectively connected to the upper surfaces of the left and right tilt cylinders 10 via fittings 14. Each of the two tilt hoses 13 is located above the tilt cylinder 10.
Extends to form a large arc-shaped loop for absorbing up / down tilt during expansion / contraction operations, and further extends inward (toward the center of the machine) along the upper rear surface of the front protector 2. And the front protector 2
Is connected through a fitting 15 to a corresponding branch end of the tilt pipe 6 at a substantially central portion.

On the other hand, a notch 16 for connecting the tilt pipe 6 and the tilt hose 13 is formed at the upper end of the center of the front protector 2 in the vehicle width direction. The notch 16 is formed in a horizontally long rectangular shape in the present embodiment, and is closed by the hose cover 17 from the front side of the front protector 2 after the connection work between the tilt pipe 6 and the tilt hose 13 is completed. ing. The hose cover 17 is detachably fastened to the front protector 2 and the instrument panel 3 by screws 18 as shown in FIG. Further, the tilt hose 13 is prevented from interfering with other components existing in the vicinity thereof by a hose guide 19 attached to the rear surface of the front protector 2 in the vicinity of the connection portion with the tilt pipe 6.

In addition to the operation lever 21 of the oil control valve 5 shown on the left and right sides of the steering post 20 with the steering post 20 interposed therebetween, the steering post 20 is used for traveling forward and backward and for switching between high speed and low speed. There are arranged levers such as a shift lever and a parking brake lever, and also pedals such as an accelerator pedal, a brake pedal, and a clutch pedal.
And before the piping work of the tilt hose 13.

As described above, in this embodiment, the connection between the tilt pipe 6 extending from the oil control valve 5 and the tilt hose 13 extending from the tilt cylinder 10 is substantially connected to the front protector 2 in the vehicle width direction. It is set at the upper end of the rear surface in the center, and a cutout 16 for connection work is provided in the front protector 2 corresponding to the same portion. Therefore, the work of connecting the tilt pipe 6 and the tilt hose 16, that is, the work of tightening the fitting 15 can be performed from the front side of the front protector 2 through the notch 16.

[0015] As a result, the worker can use the front protector 2.
In order to be able to perform the work while standing on the front of the front protector 2, which is performed from the rear side of the front protector 2 in which many functional parts are present, it is possible to freely operate this while visually observing using a torque wrench. The tightening work of the fitting 15 can be performed. After the completion of the piping work, as described above, the tilt hose 13 and the connection between the tilt hose 13 and the tilt pipe 6 are covered by the hose cover 17 and the hose guide 19 to protect them from interference with other parts and the like. Is done.

[0016]

As described in detail above, according to the present invention,
The fitting work, which is the connection work between the tilt pipe and tilt hose, can be performed from the front side of the front protector. It is possible to perform the tightening operation while visually using the device. as a result,
Tightening torque can be controlled, and problems such as oil leakage due to insufficient tightening and bending or cracking of the pipe due to excessive tightening can be avoided. Further, since the tilt hose is formed to extend upward, a large curved loop can be formed, so that the hose is not overloaded and its durability is improved.
Moreover, since the piping is provided along the upper rear portion of the front protector, it is possible to provide a wider foot space for the driver than in the conventional case where the piping is provided along the lower rear portion of the front protector.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a hydraulic piping structure for a tilt cylinder and a peripheral portion thereof according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view showing a conventional hydraulic piping structure for a tilt cylinder and a peripheral portion thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body frame 2 ... Front protector 4 ... Toe board 5 ... Oil control valve 6 ... Tilt pipe 10 ... Tilt cylinder 13 ... Tilt hose 16 ... Notch 17 ... Hose cover

Claims (1)

(57) [Claims] 1. A hydraulic piping structure for connecting an oil control valve arranged and fixed on a lower surface of a toe board to left and right tilt cylinders installed on both right and left sides of a vehicle body frame, wherein one end of the oil control valve is connected to the oil control valve. A tilt hose connected to the control valve and extending upward along the rear surface of the front protector through the toe board and branching left and right near the upper end of the front protector, one end of which is connected to the tilt cylinder. At the upper part of the tilt cylinder so as to have an appropriate loop, and further along the upper part of the rear surface of the front protector, further to the center part side, and connect its end to the branch end of the tilt pipe. The tilt pipe and the tee are provided at the upper center of the front protector. Notch provided with a for the connection work with Tohosu, hydraulic piping structure for a tilt cylinder mounted detachably a cover for covering the same notch in the front protector.