JPH1182423A - Fluid pressure cylinder device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the flow rate consumption corresponding to the volume, and reduce the volume of peripheral fluid equipment by hollowing at least a piston of the piston and a rod, and providing a small rod within a fluid chamber having a larger sectional area of two fluid chambers formed by the piston. SOLUTION: A piston 4 and a rod 3 fixed thereto are hollowed in a form where their output end sides are blocked, and a small rod 6 is inserted into a hollow hole 22 from the piston 4-side opening. The small rod 6 is pierced through the larger one of two hydraulic chambers 9a, 9b, or the hydraulic chamber 9b on the belly side of the piston 4, and its end part is inserted and fixed to a support block 2. When the piston 4 is thus moved in the direction of contracting the volume of the hydraulic chamber 9b, the displacement of the piston 4 is reduced to the same moving quantity of a hydraulic cylinder by the volume corresponding to the sectional area of the small rod 6, and the oil consumption corresponding to this volume is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder device such as a pneumatic cylinder using a pneumatic cylinder used for a swing device of a flight simulator, a hydraulic system of a construction machine, or a brake cylinder. .

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a hydraulic cylinder used for a swinging device of a flight simulator, FIG. 3 is a cutaway view along an axial direction thereof, and FIG. In FIGS. 3 and 4, reference numeral 20 denotes a cylinder, two support blocks 1, 2 forming a pair in the longitudinal direction, a tubular body 21 engaging the support blocks 1, 2, and a cylinder 20. And a plurality of connecting rods 11 laid on the base. 4
Is a piston fitted reciprocally slidably in the cylindrical body 21 of the cylinder 20, and the inside of the cylinder 20 is partitioned by the piston 4 into two hydraulic chambers 9a and 9b.

Reference numeral 3 denotes a rod for taking out a driving force fixed to the piston 4, and its output end penetrates through the support block 1 on one side of the cylinder 20 to constitute a single rod type hydraulic cylinder. ing. Ports 1a and 2 for supplying and discharging hydraulic oil are provided in the two hydraulic chambers 9a and 9b.
a is provided respectively. Reference numeral 5 denotes a seal provided on the outer periphery of the rod 3, formed by superimposing a plurality of ring-shaped packings, and preventing leakage of hydraulic oil from a gap on the outer periphery of the rod 3.

When the hydraulic cylinder 20 is operated, the hydraulic cylinder 20 changes the oil pressure of the hydraulic oil introduced from the port 1a or 2a into the hydraulic chamber 9a or 9b to change the volume of the hydraulic chamber 9a or 9b. The driving force is controlled by increasing and decreasing the length of the rod 3.

The rate of expansion and contraction of the rod 3, ie, the speed ν of the rod 3, and the rate of change in volume of each of the hydraulic chambers 9a, 9b, ie, the flow rate q, are proportional and are expressed by the following equations. q = A · ν (1) where A is the cross-sectional area of the piston 4. That is, the rod 3
Is constant, the hydraulic cylinder 20 increases the amount of oil delivered as the cross-sectional area A of the piston 4 increases.

[0006]

In order to increase the size of a swinging device of a flight simulator in which the hydraulic cylinder is used, an increase in the capacity of the hydraulic cylinder is indispensable. For this, means for increasing the piston stroke or increasing the output are adopted. Conventionally, since the strength (rigidity) of the rod 3 is limited in order to increase the stroke, means for increasing the diameter of the piston 4 to increase the output has been employed.

However, when the diameter of the piston 4 is increased, the consumption flow rate of the hydraulic cylinder is increased, so that the capacity of peripheral equipment such as a hydraulic supply source is required. There is a problem that noise is increased.

In view of the problems of the prior art, the present invention realizes an increase in the size of the hydraulic cylinder without increasing the consumption flow rate and the manufacturing cost, and effectively achieves a higher output of the hydraulic cylinder. The purpose is to:

[0009]

In order to solve the above-mentioned problems, the present invention provides a cylinder having a bottomed cylinder and two fluid chambers inside the cylinder which is reciprocally fitted on the inner periphery of the cylinder. A hydraulic cylinder device comprising: a dividing piston; and a rod fixed to the piston and having an output end penetrating through a side plate on one side of the cylinder and transmitting a driving force of the piston to the outside. At least the piston is formed hollow among the piston and the rod, and is relatively slidably fitted to the inner periphery of the piston,
A fluid pressure cylinder device is provided, wherein one end of the fluid chamber has a penetrating member that penetrates the fluid chamber having the larger cross-sectional area of the two fluid chambers to reduce the cross-sectional area of the fluid chamber.

According to this invention, the penetrating member is provided so as to penetrate into the fluid chamber having the larger cross-sectional area of the two fluid chambers defined by the piston, so that the cross-sectional area of the penetrating member is increased. The cross-sectional area of the fluid chamber decreases, and the displacement volume of the fluid chamber when the piston enters the fluid chamber side decreases by a volume corresponding to the cross-sectional area of the penetrating member. Therefore, the consumption flow rate corresponding to this volume is reduced,
Due to the decrease in the consumption flow rate, the capacity of the fluid equipment around the pump, which is the fluid supply source, is reduced.

Preferably, in the above invention, by forming the penetrating member hollow, the hollow portion can be used as an air hole. The air hole is used to release the air pressure in the hollow chamber in the rod caused by the vertical movement of the rod. With this configuration, it is not necessary to process the air hole in the rod, and the number of processing steps is reduced. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a cutaway view showing a hydraulic cylinder used in a flight simulator swinging device according to an embodiment of the present invention, and FIG. 2 is a small rod (penetrating member) of the hydraulic cylinder.
FIG. 2 is a configuration diagram showing various structural examples of FIG. In FIGS. 1 and 2, reference numeral 20 denotes a cylinder, two support blocks 1, 2 forming a pair in the longitudinal direction, a tubular body 21 connecting the support blocks 1, 2, and between the support blocks 1, 2. It consists of a plurality of connecting rods 11 erected.

Reference numeral 4 denotes a piston reciprocally slidably fitted into the cylindrical body 21 of the cylinder 20.
The interior is partitioned by the piston 4 into two hydraulic chambers 9a and 9b. The two hydraulic chambers 9a and 9b are provided with ports 1a and 2a for supplying and discharging hydraulic oil, respectively.

Numeral 3 is a rod for taking out a driving force fixed to the piston 4, and its output end penetrates through the support block 1 on one side of the cylinder 20 to constitute a single rod type hydraulic cylinder. ing. Reference numeral 5 denotes a seal provided on the outer periphery of the rod 3, formed by superimposing a plurality of ring-shaped packings, and preventing leakage of hydraulic oil from a gap on the outer periphery of the rod 3. The above configuration is the same as the hydraulic cylinder according to the prior art shown in FIGS.

In the embodiment of the present invention, the piston and the rod of such a hydraulic cylinder are improved. That is, in FIG. 1, the piston 4 and the rod 3 fixed to the piston 4 are formed hollow so that the output end side thereof is covered, and the small rod 6 is inserted into the hollow hole 22 from the opening on the piston 4 side. Has been inserted. The small rod 6 penetrates one of the two hydraulic chambers 9 a and 9 b having a larger cross-sectional area, that is, the hydraulic chamber 9 b on the ventral side of the piston 4, and the end is inserted into the support block 2 and fixed.

Reference numeral 7 denotes a small rod seal fixedly inserted into the inner periphery of the piston 4, which is made of a sealing material formed by superposing a plurality of elastic ring packings such as oil-resistant rubber. The small rod 6 is reciprocally slidably fitted to the inner periphery of the rod seal 7 in a fluid-tight manner to prevent the hydraulic oil in the hydraulic chamber 9 b from leaking into the rod 3. The small rod 6 is formed hollow, and the hollow hole forms the air hole 8.

During operation of the hydraulic cylinder, the hydraulic cylinder is connected to the hydraulic chamber 9a through the port 1a or 2a.
Alternatively, the volume of the hydraulic chamber 9a or 9b is increased or decreased by changing the hydraulic pressure of the hydraulic oil introduced into the 9b, and the driving force is controlled by expanding and contracting the rod 3.

Since the small rod 6 penetrates into the hydraulic chamber 9b having a large cross-sectional area facing the ventral side of the piston 4, the cross-sectional area of the hydraulic chamber 9b is set to the hydraulic pressure of the prior art shown in FIG. It is smaller than the chamber 9b by the cross-sectional area of the small rod 6.

Therefore, when the piston 4 moves in the direction of reducing the volume of the hydraulic chamber 9b, the displacement of the piston 4 is reduced by the displacement of the piston 4 for the same amount of movement as the conventional hydraulic cylinder shown in FIG. Reduced by the volume corresponding to the area,
The amount of consumed oil corresponding to this volume is reduced.

FIG. 2 shows four embodiments of the small rod 6. FIG. 2A shows that the piston 4 and the rod 3 fixed thereto are formed in a hollow shape in which the output end side thereof is covered, and a small hole is formed in the hollow hole 22 from the opening on the piston 4 side. The rod 6 has been inserted. The small rod 6 is a solid rod, and a small rod seal 7 fitted in a ring shape is provided on the inner peripheral portion of the piston 4 near the hydraulic chamber 9b. The air hole 8 is provided at the output end of the rod 3 because the small rod 6 is a solid rod. FIG. 2 (b) shows a small rod 6 made solid and a small rod seal 7 provided at the end of the small rod 6 in the same manner as described above. The air hole 8 is provided at the output end of the rod 3 because the small rod 6 is a solid rod.

In FIG. 2C, the small rod 6 is hollow, and the inside of the hollow hole is an air hole 8. The small rod seal 7 is provided on the inner peripheral portion of the piston 4 near the hydraulic chamber 9b. In FIG. 2D, the small rod 6 is hollow as in FIG. 2C, and the inside of the hollow hole is an air hole 8. The small rod seal 7 is provided at the end of the rod 3.

If the small rod 6 is formed hollow as shown in FIGS. 2C and 2D, the hollow hole can be used as the air hole 8 as it is, so that it is not necessary to provide the rod 3 with an air hole. Processing costs are reduced.

The present invention can of course be applied to a pneumatic cylinder instead of the hydraulic cylinder in the above embodiment.

[0025]

As described above, according to the present invention, the penetrating member is provided so as to penetrate the larger one of the two fluid chambers defined by the piston. The cross-sectional area of the fluid chamber decreases by the cross-sectional area, and the displacement volume of the fluid chamber when the piston enters the fluid chamber decreases by an amount corresponding to the cross-sectional area of the penetrating member.

Therefore, the consumption flow rate corresponding to this volume is reduced, and the capacity of peripheral fluid devices such as a pump as a fluid supply source is reduced by the reduction of the consumption flow rate. As a result, it is possible to reduce the cost of the apparatus, which exceeds the increase in the number of processing steps for the penetrating member.

[Brief description of the drawings]

FIG. 1 is a cutaway view showing a hydraulic cylinder according to an embodiment of the present invention.

FIGS. 2A to 2D are configuration diagrams showing four modes of a penetrating member (small rod) according to the embodiment.

FIG. 3 is a cutaway view showing a hydraulic cylinder according to a conventional technique.

FIG. 4 is a configuration diagram of a conventional hydraulic cylinder.

[Explanation of symbols]

 1, 2 support block 1a, 2a port 3 rod 4 piston 5 seal 6 small rod (penetrating member) 7 small rod seal 8 air hole 9a, 9b hydraulic chamber 20 hydraulic cylinder

Claims (2)

[Claims] 1. A cylinder having a bottomed cylindrical shape, a piston reciprocally fitted to an inner periphery of the cylinder, and dividing the inside of the cylinder into two fluid chambers, and an output end fixed to the piston. Is provided through a side plate on one side of the cylinder, and a rod for transmitting a driving force of the piston to the outside. At least the piston is formed hollow among the piston and the rod, A penetrating member fitted to the inner periphery of the piston so as to be relatively slidable, one end of which penetrates a fluid chamber having a larger cross-sectional area of the two fluid chambers to reduce the cross-sectional area of the fluid chamber. A fluid pressure cylinder device comprising: 2. The fluid pressure cylinder device according to claim 1, wherein said penetrating member is formed hollow.