JPS5836899A - Tilt cylinder in industrial car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tilt cylinder for an industrial vehicle, and more particularly to a tilt cylinder that can fully improve forward visibility.

To explain the cargo handling section of an industrial vehicle using a reach-type forklift as shown in FIG. A tilt cylinder 4 is bolted to a lift bracket 6, which is a component of the carriage 2, via a mounting bracket 5. As the operating rod 6 of the tilt cylinder 4 advances and retreats, the tip of the operating rod 6 presses against the back surface of the swing i<-7 provided in front of the lift bracket 6, and as a result, swings around the shaft 8 as the center of rotation. It is configured such that it is locked to the par 7 and the fork 9 can be tilted back and forth.

The configuration of the tilt cylinder 4 in the cargo handling section is as follows:
Conventionally, the one shown in FIG. 2 has been widely used. Inside the cylinder body 10 of this tilt cylinder 4, a piston 11
The chamber A 12 and the boat B 13 are partitioned in a fluid-tight manner, and the boat B is connected to the chamber A 12 and the boat B is connected to the chamber B 16, respectively. Then, when the hydraulic oil is supplied to the A chamber 12 through the boat 8, the piston 11 moves in the B direction 13, and while gradually discharging all the hydraulic oil in the B chamber 16 from the boat B, the operating rod 6 is moved in the forward direction. That is,
Move the fork 9 in a direction that tilts it backward. Conversely, when hydraulic oil is supplied to the B chamber 16 through the port B, the piston 11 moves toward the A chamber 12 and operates while gradually discharging the hydraulic oil in the A chamber 12 from the port A. The rod 6 operates in the backward direction, that is, in the direction in which the fork 9 tilts forward. In this way, the fork 9 can be tilted back and forth by moving the operating rod 6 of the tilt cylinder 4 forward and backward.

Note that reference numeral 14 in FIG. 1 is a backrest fixed to the carriage 2.

However, in the conventional tilt cylinder 4, as shown in FIG.
are connected with pipes 15 and 16 respectively, and this pipe 15
．． 16, a hydraulic hose 17 for supplying hydraulic oil to the tilt cylinders 4, 4 from an oil pump not shown.
．． 18 is placed on the top of the lift cylinder 19. Two hydraulic hoses 17 and 18 are arranged between the masts 1 and 18 to avoid being connected in a suspended state to the left and right booms 20.21. There was a problem in that the front visibility of the forklift was significantly narrowed by the diameter width of this hydraulic hose 17°18.

The present invention has been made by focusing on such conventional problems, and the tilt cylinder is configured in a behavioral manner to provide a single hydraulic hoser for supplying all the hydraulic pressure, thereby improving the forward visibility of the forklift. The purpose of this is to improve the performance.

ξ As a means for solving all of these objects, the tilt cylinder according to the present invention is composed of a cylinder body and an actuating rod that is inserted into the cylinder body so as to be able to advance and retreat, and is partitioned by a piston in the cylinder body. One of the chambers is connected to a hole for supplying or discharging hydraulic oil, and the other chamber is provided with a spring that biases the operating rod toward the advancing side or the retreating side.

The present invention will be described in detail below based on embodiments shown in the accompanying drawings.

In FIG. 3, the tilt cylinder 4 according to the present invention is a single-acting cylinder and has a cylindrical cylinder body 10, and the inside of the cylinder body 10 is divided into an A chamber 12 and a B chamber by a piston 11 as in the conventional case. A port A communicating with the A chamber 12 is connected to the rear end of the cylinder body 10. Further, the actuating rod 6 is fixed to the piston 11 with a nut 22, and the piston 1
A spring 24 is wound around the B chamber 16 formed by the cylinder body 1 and the cover body 23 of the cylinder body 10. The spring 24 biases the actuating rod 6 toward the retreating side. Furthermore, piston 11 K is A
An orifice hole 25 is bored through the chamber 12 and the B chamber 16, and the excess or insufficient portion in the B to 16 can be returned to the A chamber 12. When hydraulic oil is supplied to the A chamber 12 through the port Ak, the piston 11 overcomes the biasing force of the spring 24 and moves toward the B chamber 16.
The excess oil in the chamber is passed through the orifice hole 25'' to the A chamber 12.
The actuating rod 6 moves in the forward direction while gradually discharging the liquid. Conversely, when the bow)A11tl is opened, the piston 11 is moved through A by the biasing force of the spring 24, and an appropriate amount of hydraulic oil is supplied into the chamber 13.

The tilt cylinder according to the above embodiment is an example in which the orifice hole 25 is completely bored in the piston 11, but in the present invention, an oil tank (not shown) is provided at the tip of the B chamber 16. A connecting pipe may be provided to drain excess oil in the B chamber 16 into the oil tank. In this case, the oil tank is installed inside the carriage.

FIG. 4 shows the configuration of a reach type forklift truck to which the tilt cylinder 4 according to the present invention is applied. As in the past, the tilt cylinder 4 is bolted to the lift bracket 6, which is a component of the carriage 2, via the mounting bracket 5. However, unlike in the past, the tilt cylinders 4 arranged on the left and right are Hydraulic port A.

A is connected by a single pipe 15, and a hydraulic hose 17 suspended over a pulley 20 at the top of the lift cylinder 19 is connected to this pipe 15, and the other end of this hydraulic hose 17 is connected to an oil pump not shown. Therefore, since this hydraulic hose 17 is fixed to the shaft 71 of the lift cylinder 19 between the oil pump and the pulley 20, one hydraulic hose 17 is disposed between the lift cylinder 19 and the mast 1. As a result, the driver's forward visibility is expanded by the diameter of one hydraulic hose 17 compared to the conventional case.

In FIG. 4, reference numeral 7 denotes a swing bar that is pressed by the tip of the operating rod 6 of the tilt cylinder 4, and the swinging of this swing bar 7 allows the forks 9, 9 to be tilted back and forth.

As explained above, according to the tilt cylinder according to the present invention, the actuating rod is disposed in the cylinder body on the advancing side or the rear (
1111, all of the springs are installed to bias either side of the rod, eliminating the need for one hydraulic piping for advancing and retracting the actuating rod, which previously required two. This eliminates the need for a hydraulic hose that supplies hydraulic oil between intervals.
The effect is that the forward visibility of the forklift can be improved accordingly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the piping state of a conventional tilt cylinder in the case of a reach-type forklift as an example, FIG. 2 is a cross-sectional explanatory view showing an example of a conventional tilt cylinder, and FIG. Cross section ipJ showing an example of a cylinder
FIG. 4 is a perspective view showing the piping state of the tilt cylinder in the case of a reach-type forklift as an example. 1...Mast 4...Naruto cylinder 6.
...Operating rod 9...Fork 10...Cylinder body 11...Piston 12...A chamber
16... B silkworm 24... Spring 25
... Oriais hole (passage) A, B ... boat

Claims (1)

[Claims] In a tilt cylinder that is disposed on the mast side of an industrial vehicle and operates a fork so that it can tilt forward and backward, the tilt cylinder is composed of a cylinder body and an actuating rod that is inserted into the cylinder body so that it can move forward and backward, and the tilt cylinder One chamber defined by the piston in the main body is connected to a hydraulic fluid for supplying or discharging hydraulic oil, and the other chamber is equipped with a spring that biases the operating rod toward the advancing side or the retreating side. l? Tilt cylinder for industrial vehicles.