JPH04341602A - Multi-cylinder device - Google Patents

Abstract

PURPOSE:To separate cylinders from each other surely despite growth of crack occurring in a collar portion and make the structure simple and compact. CONSTITUTION:Due to a pressure load or the like, crack occurs occasionally at the bottom end of a collar portion 43. However, growth of this crack in peripheral direction stops when it reaches a slit 44 because the slit 44 extends at least to the bottom end of the collar portion 43. Accordingly, though an arcuate piece 45 separates from a cylinder partition wall 37, a remaining arcuate piece 45 stays sound. The separation of cylinder chambers 38, 39 is thus maintained.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is particularly applicable to aircraft rudders, in which a plurality of cylinder chambers and pistons are arranged in series, so that even if one of them is damaged or malfunctions, the remaining one will operate, improving safety. The present invention relates to a multi-cylinder device used for the operation of.

0002

2. Description of the Related Art As a conventional multi-cylinder device, one shown in FIG. 3, for example, is known. This thing is
A cylinder case 12 having an inner chamber 11 formed therein, a cylinder partition wall 15 that is housed and fixed in the inner chamber 11 of the cylinder case 12 and divides the inner chamber 11 into two cylinder chambers 13 and 14, and each cylinder. Pistons 16, 17 slidably housed in chambers 13, 14, and both pistons 16, 17
and a piston rod 18 that connects the cylinder case 12 and the cylinder partition wall 15, and has an annular groove 1 on the inner circumferential surface of the inner chamber 11 facing the cylinder partition wall 15.
9, and a collar portion 20 to be inserted into the annular groove 19 is formed on the outer peripheral surface of the cylinder partition wall 15. In this case, pressure load and piston 1
If the flange 20 that receives the collision loads of 6 and 17 cracks from the base end due to stress concentration, and this crack progresses in the axial and circumferential directions, the flange 20 will separate from the cylinder partition wall 15. The cylinder partition wall 15 is composed of two partition wall portions 21 and 22 separated at the center in the axial direction, and even if one of the rib portions 23 or 24 is separated from the partition wall portion 21 or 22, the other partition wall portion 21 or 22 remains.
2 still isolates both cylinder chambers 13, 14.

0003

[Problems to be Solved by the Invention] However, in such a conventional multi-cylinder device, since the cylinder partition wall 15 is composed of two partition wall portions 21 and 22, the number of parts increases. However, there are problems in that the structure is complicated, the length is increased in the axial direction, and the manufacturing cost is also high.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-cylinder device that is simple in structure, small in size, and inexpensive to manufacture.

[0005]

[Means for Solving the Problems] Such an objective is to provide a cylinder case having an inner chamber formed therein, and a cylinder that is housed and fixed in the inner chamber of the cylinder case and divides the inner chamber into a plurality of cylinder chambers. A cylinder partition wall, a piston slidably housed in each cylinder chamber, and a piston rod that connects each piston and passes through the cylinder case and the cylinder partition wall, the inner periphery of the inner chamber facing the cylinder partition wall. An annular groove is formed on the surface, and a collar portion inserted into the annular groove is formed on the outer circumferential surface of the cylinder partition, and the collar portions are separated from each other in the circumferential direction and have a radius extending at least to the base end of the collar portion. This can be achieved by forming a plurality of slits extending inwardly.

[0006]

[Operation] When a multi-cylinder device is used, the flange portion of the cylinder partition wall receives pressure load and collision load from the piston, so stress concentration occurs at the base end and cracks may occur from the base end. In this way, the cracks develop in the axial and circumferential directions due to the pressure load and the collision load of the piston, but the cracks grow apart in the circumferential direction from each other in the rib portion and radially inward until at least reaching the proximal end of the rib portion. Since a plurality of slits are formed extending toward the slit, the progress in the circumferential direction ends when the slit is reached. As a result, one arc-shaped piece between adjacent slits separates from the cylinder partition wall due to the propagation of the crack, but the remaining pieces are integrated with the cylinder partition wall, so the pressure load and piston collision load mentioned above are reduced. These remaining pieces are received and the cylinder continues to operate normally. As a result, it is not necessary to construct the cylinder partition wall provided with the flange portion from two parts, so that the structure can be simplified, the size can be reduced, and the manufacturing cost can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 26 is a multiple (double) cylinder device, and this cylinder device 26 has an inner chamber 2 inside.
7, this cylinder case 28 has two cylinder bodies 31, a cylinder body 31 constituting the rear part and a cylinder body 32 constituting the front part.
32 is assembled by fastening them with a plurality of bolts 33 and nuts 34. 37 is a cylinder partition housed in the inner chamber 27 of the cylinder case 28;
The inner chamber 27 is liquid-tightly connected to two cylinder chambers 38 and 39.
Divide into. An annular groove 42 extending in the circumferential direction is formed on the inner circumferential surface of the inner chamber 27 facing the outer circumferential surface of the cylinder partition wall 37.
It is established on the border of Further, the cylinder partition wall 3
7 has a ring-shaped flange 43 formed on its outer peripheral surface, and this flange 43 is inserted into the annular groove 42 . A plurality of slits 44 (four in this embodiment) are formed in this flange portion 43 at equal distances apart in the circumferential direction.
4 extends inward in the radial direction from the outer periphery of the collar 43, and its inner end reaches at least the base end of the collar 43, and in this embodiment reaches a little further inward than the base end. As a result, the brim portion 43 has these slits 4
4, it is completely divided into a plurality of (four) arc-shaped pieces 45.

Pistons 48 and 49 are slidably accommodated in the cylinder chambers 38 and 39 in a fluid-tight manner, respectively, and these pistons 48 and 49 connect the cylinder chambers 38 and 39 to chambers 38a and 38b, respectively. and chamber 3
Divide into 9a and 39b. A cylindrical inner rod portion 52 is integrally connected to the inner end of one of the pistons 48 located at the rear, and this inner rod portion 52 is connected to the cylinder case 28 and the cylinder partition wall 3.
It passes through 7. Further, a cylindrical outer rod portion 53 is integrally connected to the inner end of the other piston 49 located at the front, and this outer rod portion 53 is connected to the inner rod portion 5.
It is fitted on the outside of 2. A female threaded portion 55 is formed on the inner periphery of the tip portion of this outer rod portion 53, and on the other hand,
A male threaded portion 56 is formed at the tip of the inner rod portion 52 . The tips of the outer rod portion 53 and the inner rod portion 52 are connected to a female threaded portion 55 and a male threaded portion 56.
are connected by screwing together, and the male threaded portion 56
It is prevented from loosening by a lock nut 57 that is screwed into the lock nut 57. The aforementioned female threaded portion 55, male threaded portion 56, and lock nut 57 constitute a connecting body 58 as a whole. Further, like the inner rod portion 52, this outer rod portion 53 also passes through the cylinder case 28 and the cylinder partition wall 37. 6
5 is a rod end connected to the tip of the inner rod portion 52 by having its female threaded portion 66 screwed into the male threaded portion 56, and this rod end 65 is loosened by a lock nut 67 screwed into the male threaded portion 56. It's stopped. The aforementioned inner rod portion 52, outer rod portion 53, and rod end 6
5 constitutes a piston rod 68 that connects the pistons 48 and 49 as a whole.

When moving the pistons 48, 49 and piston rod 68 toward the tip side, pressurized oil is pumped into the chamber 3.
However, under normal conditions when high pressure oil is supplied to both the supply and discharge ports 71 and 72, the oil is supplied to the chambers 38a and 39a.
Pressure oil is supplied to both chambers 9a, and in the event of an abnormality in which one of the systems breaks down and pressure oil is supplied to only one of the supply/discharge ports 71 and 72, pressure oil is supplied to only one of the chambers 38a and 39a. Supplied. At this time, low pressure oil is discharged from the supply and discharge ports 73 and 74. Conversely, pistons 48, 4
9. When moving the piston rod 68 to the rear end side, pressure oil is supplied from the supply/discharge ports 73 and 74 to both or one of the chambers 38b and 39b. At this time, the supply/discharge port 7
Low pressure oil is discharged from 1 and 72.

Furthermore, when such a cylinder device 26 is used, the flange portion 43 of the cylinder partition wall 37 receives a pressure load and a collision load of the pistons 48 and 49, and stress concentration occurs at the base end, causing a drop from the base end. It may crack. In this way, cracks are caused by the pressure load and the piston 4.
The cracks develop in the axial direction and the circumferential direction due to the collision loads of 8 and 49, but since the plurality of slits 44 as described above are formed in this collar portion 43, the cracks reach the slits 44 in the circumferential direction. It ends when As a result, one arcuate piece 45 between adjacent slits 44 separates from the cylinder partition wall 37 due to the development of the crack, but the remaining arcuate pieces 45 are integrated with the cylinder partition wall 37, so that the above-mentioned pressure Load and piston 48, 4
The collision load of 9 is received by these remaining three arcuate pieces 45,
Cylinder 26 continues to operate normally. As a result, the cylinder partition wall 37 provided with the flange portion 43 does not need to be constructed from two parts, so that the structure is simple and compact, and the manufacturing cost can be reduced.

[0011]

As described above, according to the present invention, the structure can be simplified, the size can be reduced, and the manufacturing cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a side view of a cylinder partition.

FIG. 3 is a front sectional view showing an example of a conventional multiplex cylinder.

[Explanation of symbols]

Claims (1)

[Claims] Claims 1: A cylinder case having an inner chamber formed therein; a cylinder partition that is housed and fixed in the inner chamber of the cylinder case and divides the inner chamber into a plurality of cylinder chambers; and a cylinder partition wall that is slidable into each cylinder chamber. and a piston rod that connects the pistons and passes through the cylinder case and the cylinder partition wall, an annular groove is formed in the inner circumferential surface of the inner chamber facing the cylinder partition wall, and the cylinder partition wall A collar is formed on the outer peripheral surface of the collar to be inserted into the annular groove, and a plurality of slits are formed in the collar that are separated from each other in the circumferential direction and extend radially inward at least until reaching the base end of the collar. A multi-cylinder device characterized by: