JPH08323518A - Multiplex rotating cylinder - Google Patents

Abstract

PURPOSE: To shorten the overall length dimension of a cylinder and stabilize rotation of a rotating cylinder provided with a plural number of pistons on a same shaft. CONSTITUTION: A partition wall 6 is provided on the inside of cylinder body 1, while a large diameter piston chamber 7 is provided on the outside of the partition wall 6 and a small diameter piston chamber 8 is provided on the inside so as to have them overlapping each other in the axial directional position. The large diameter chamber 7 is housed with a first piston 10, while the small diameter chamber 8 is housed with a second piston 12, and a small diameter rod 14 of the second piston 12 is run through a hollow rod 11 of the first piston 10. A shaft 17 is provided on the back side of the cylinder body 1 by protruding it and a distributor 18 for feeding operating fluid the respective piston chambers 7, 8 is fitted to the outside circumference of the cylinder body 1 by inserting it therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cylinder for operating a chuck attached to a machine tool such as a lathe,
In particular, it relates to a multi-rotating cylinder having a plurality of pistons in a cylinder body.

[0002]

2. Description of the Related Art Conventionally, a double rotary cylinder as shown in FIG. 5 is known. In this cylinder, a pair of front and rear piston chambers 92 and 93 are formed on the same axis in a cylinder body 91 that rotates integrally with a chuck (not shown). Large diameter piston chamber 9 on the front side (spindle side such as lathe)
2 has a first piston 94 and a small-diameter piston chamber 93 on the rear side.
The second pistons 95 are slidably accommodated in the
The small diameter rod 96 of the second piston 95 is the first piston 94.
Through the hollow rod 97. A shaft portion 98 is provided so as to project from the rear side of the cylinder body 91, and a distributor 99 for supplying hydraulic oil to the piston chambers 92, 93 is relatively rotatable on the outer periphery thereof, that is, allows the rotation of the shaft portion 98. It has been inserted. According to this double rotary cylinder, since the pair of pistons 94 and 95 are coaxially arranged side by side, there is an advantage that the entire cylinder can be made relatively thin.

[0003]

However, according to the conventional rotary cylinder, since the two piston chambers 92, 93 are provided in front of and behind the cylinder body 91, the overall length of the cylinder becomes long, Cylinder body 91
When the spindle is attached to the rear end of the spindle and rotated, the amount of protrusion of the rotary cylinder becomes large and the rotation becomes unstable. Further, since the distributor 99 is provided on the rear side of the cylinder main body 91, this is another factor that lengthens the overall length.

Therefore, an object of the present invention is to provide a multi-rotating cylinder which can reduce the overall length of the cylinder.

[0005]

In order to solve the above-mentioned problems, in a multi-rotating cylinder according to the invention of claim 1, a plurality of piston chambers are provided on the cylinder body on the same axis, and the pistons are slid in the respective piston chambers. Movable housing, at least 2
The two piston chambers are provided with different diameters so that their axial positions overlap with each other.

In the multi-rotating cylinder according to the invention of claim 2, a plurality of piston chambers are provided in the cylinder body on the same axis, the pistons are slidably accommodated in the respective piston chambers, and at least two piston chambers are formed by partition walls inside and outside. I set it up twice
The first piston is accommodated in the outer large-diameter piston chamber, the second piston is accommodated in the inner small-diameter piston chamber, the hollow rod is provided in the first piston, and the small-diameter rod penetrating the hollow rod is provided in the second piston. , A distributor for supplying a working fluid to the small diameter and large diameter piston chambers.

According to a third aspect of the present invention, a multi-rotating cylinder is constructed by forming a small diameter rod in a hollow shape and inserting a distributor inside the small diameter rod.

In the multi-rotating cylinder according to the invention of claim 4, the small diameter rod is formed in a hollow shape, the cylindrical portion of the cylinder body is inserted inside the small diameter rod, and the distributor is inserted inside the cylindrical portion. Composed.

[0009]

According to the multi-rotating cylinder of the first aspect, since at least two piston chambers are provided so as to have different diameters and axial positions thereof overlap with each other, the overall length of the cylinder is shortened and the rotation is stabilized.

In the multi-rotating cylinder according to claim 2,
The working fluid is supplied to the large and small diameter piston chambers by the distributor, the first and second pistons are driven outside and inside the partition member, the hollow rod is on the outer peripheral surface of the small diameter rod, and the small diameter rod is the hollow rod. It is slid along the inner peripheral surface. Therefore, the strokes of the two pistons are overlapped at substantially the same axial position, the overall length of the cylinder is shortened, and the mutual guide action of the rods smoothly drives the respective pistons on the same axis.

According to the multi-rotating cylinder of claim 3, since the distributor is inserted inside the small diameter rod, the total length of the cylinder is further shortened.

In the multi-rotating cylinder of claim 4,
The distributor is inserted into the inside of the small diameter rod through the tubular portion of the cylinder body, and the small diameter rod is slidably guided by the outer peripheral surface of the tubular portion. Therefore, the distributor does not need to have a guide function for the small diameter rod, and the total length of the cylinder can be shortened by using a short distributor. Nevertheless, the small diameter rod can be accurately provided by the straight cylindrical portion of the cylinder body. You can go straight.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment in which the present invention is embodied in a double rotary cylinder. The cylinder body 1 of the rotating cylinder is configured by fitting the inner bowl-shaped member 3 into the outer bowl-shaped member 2 and the plug member 4 into the inner bowl-shaped member 3, and inserting the plug member 4 into the front bowl portion 5 of the outer bowl-shaped member 2. Is coupled to a spindle (not shown) such as a lathe, and is rotated integrally with a chuck (not shown) via the spindle. The inner bowl-shaped member 3 includes a partition wall portion 6 that protrudes inside the outer bowl-shaped member 2.
An annular large-diameter piston chamber 7 is formed between the outer cup-shaped member 2 and the outer bowl-shaped member 2, and a small-diameter piston chamber 8 is formed between the partition wall portion 6 and the plug member 4. Therefore, the cylinder body 1 is provided with the two piston chambers 7 and 8 by the partition wall 6 so as to have different diameters and to be axially doubled so as to overlap each other in the axial direction. A storage chamber 9 is formed between the front wall portion 5 of the outer bowl-shaped member 2 and the front wall 6 a of the partition wall portion 6.

A large-diameter bowl-shaped first piston 10 is housed in the large-diameter piston chamber 7 on the outer side, and a hollow rod 11 penetrating the front wall portion 5 is projectingly provided on the front surface thereof. A small-diameter second piston 12 is accommodated in the inner small-diameter piston chamber 8 in a state of being prevented from rotating by a pin 13, and a small-diameter rod 14 penetrating the front wall 6a of the partition wall portion 6 and the hollow rod 11 on the front surface thereof.
Is protruding. Then, the first and second pistons 10 and 12 are driven on the same axis by the hydraulic oil supplied to the respective piston chambers 7 and 8, and the rods 11 and 14 are slidably guided to each other, so that the rods 11 and 14 are guided. The jaws and the collet of the chuck can be opened / closed via drawbars (not shown) separately connected to each other. A communication hole 15 is formed in the front wall 10a of the first piston 10 to allow the air in the housing chamber 9 to flow in front of and behind the front wall 10a as the piston 10 moves.

The rear side of the cylinder body 1, that is, the plug member 4
A shaft portion 17 is provided on a rear surface of the rear surface, and a distributor 18 for supplying hydraulic oil to the large-diameter and small-diameter piston chambers 7 and 8 is relatively rotatably attached to the outer periphery of the shaft portion 17 through bearings (not shown). ing. The distributor 18 is provided with four supply ports 19 and a single drain recovery port 20. By hooking a pipe (not shown) connected to the drain recovery port 20, the distributor 18 can be rotated with respect to the rotation of the spindle. 18 is held in a stopped state.

A cap-shaped dog 21 is provided on the rear portion of the cylinder body 1 so as to be movable in the axial direction. An operating rod 22 is axially penetrated through the plug member 4 and the inner bowl-shaped member 3, and a front end of the operating rod 22 is hooked to the first piston 10 via a hooking plate 23 screwed to the first piston 10. At the same time, the rear end is connected to the face plate portion 25 of the dog 21 by the bolt 24. As a result, the dog 21 is integrally movably connected to the first piston 10 via the operating rod 22, and the front and rear stroke ends of the first piston 10 are provided in a pair corresponding to the position of the dog 21. It is adapted to be detected by a proximity switch (not shown).

In the double rotary cylinder of the first embodiment configured as described above, the hydraulic oil is supplied to the large and small diameter piston chambers 7 and 8 by the distributor 18, and the first and second
The pistons 10 and 12 are driven outside and inside the partition wall 6, the hollow rod 11 slides on the outer peripheral surface of the small diameter rod 14, and the small diameter rod 14 slides along the inner peripheral surface of the hollow rod 11. Therefore, the strokes of the two pistons 10 and 12 are overlapped at substantially the same axial position, the overall length of the cylinder can be shortened, and the rotation can be stabilized. The pistons 10 and 12 can be smoothly driven on the same axis.

FIG. 2 shows a second embodiment in which the present invention is embodied in a double rotary cylinder. In this embodiment, the cylinder body 31 is constructed by assembling the front wall member 33 to the block member 32 with the bolts 34, and is connected to the spindle by the mounting bolts 35 penetrating the members 32 and 33.
A cylindrical partition wall member 36 is fixed to the front surface of the block member 32 by a bolt 37 so as to project forward from the front wall member 33, and the block member 3 is provided outside the rear end portion of the partition wall member 36.
A large-diameter piston chamber 38 is provided between the inside and the outside, and a small-diameter piston chamber 39 is provided inside between the inside and outside with a small-diameter rod 45 which will be described later with their axial positions completely overlapped.

A first piston 41 is accommodated in the outer large-diameter piston chamber 38, and a hollow rod 42 is provided on the front surface thereof so as to project forward through a gap between the front wall member 33 and the partition member 36. ing. The second piston 43 is housed in the inner small-diameter piston chamber 39 in a state in which the second piston 43 is prevented from rotating by a pin 44, and the piston 43 has a hollow small-diameter rod 45.
Are formed so as to project forward and backward, the front projecting portion penetrates the partition member 36 and the hollow rod 42, and the rear projecting portion penetrates the block member 32. Then, by the hydraulic oil supplied to the piston chambers 38 and 39, the first
And the second pistons 41 and 43 are driven on the same axis,
The hollow rod 42 is slidably guided by the outer peripheral surface of the partition member 36, and the small diameter rod 45 is slidably guided by the inner peripheral surfaces of the partition member 36 and the block member 32.

A distributor 47 for supplying hydraulic oil to the large-diameter and small-diameter piston chambers 38, 39 is inserted inside the small-diameter rod 45 via a bearing 48 and a seal 49 so as to be relatively rotatable and integrally movable in the axial direction. Has been done. Distributor 4
A port member 51 having a diameter slightly larger than that of the cylinder body 31 is coupled to the rear end of the bolt 7 by a bolt 52, and the port member 51 is connected to the four oil passages 53 of the distributor 47. 62 (only one is shown) is provided, and by suspending a part of piping (not shown) connected to these ports 62, the distributor 47 is held in a stopped state when the spindle rotates.

A sleeve-like joint 54 is interposed between the distributor 47 and the small-diameter rod 45 so as to rotate integrally with the small-diameter rod 45, and each oil passage 53 of the distributor 47 is provided in the joint 54.
Is formed with an annular groove 56 and a communication hole 57 for connecting to the oil passage 55 of the small diameter rod 45. Small diameter rod 45
Two oil passages 55 are opened directly in the small-diameter piston chamber 39 before and after the second piston 43, and the remaining two oil passages 55 are
Is the block member 32, the partition member 36, and the hollow rod 4.
It is connected to the large-diameter piston chamber 38 via a wide groove 58 and a passage 59 which are respectively provided in 2. The distributor 47
Between the front end of the and the small diameter rod 45, the bearing 48
A sleeve 60 for preventing slipping off is fitted, and a mechanical seal 60a having a well-known structure for preventing oil leakage between these relative rotating members is interposed, and the sleeve 60 is held by a retaining member 61 at the front end of the small diameter rod 45. There is.

A cap-shaped member 63 is capped on the rear portion of the block member 32 so as to be movable in the axial direction, and a first dog 64 is provided on the outer periphery of the front end thereof. Block member 3
The operating rod 66 is axially penetrated through the flange portion 65 of the partition wall member 36, and the front end of the operating rod 66 is connected to the first piston 41, and the rear end thereof is connected to the face plate portion 67 of the cap-shaped member 63. As a result, the first dog 64 is integrally movably connected to the first piston 41 via the operating rod 66, and the front and rear stroke ends of the first piston 41 are located at the first dog 64.
The position is detected by a pair of proximity switches (not shown) provided corresponding to the position. Further, the peripheral wall portion 68 of the port member 51 is movably fitted on the cap-shaped member 63, a second dog 69 is provided at the front end thereof, and the front and rear stroke ends of the second piston 43 are located at the position of the second dog 69. Is detected by a pair of proximity switches (not shown) provided corresponding thereto.

In the double rotary cylinder of the second embodiment constructed as described above, hydraulic oil is supplied from the inside of the cylinder body 31 by the distributor 47 to the large and small diameter piston chambers 3.
8 and 39, and the first and second pistons 41 and 43
Are driven outside and inside the partition member 36, the hollow rod 42 slides on the outer peripheral surface of the partition member 36, and the small diameter rod 45 slides along the inner peripheral surface of the partition member 36. Therefore, the strokes of the two pistons 41 and 43 are completely overlapped at the same axial position, and the first piston 41 is configured to reciprocate within the stroke of the second piston 43.
The overall length of the cylinder can be shortened and
The rods 42 and 45 are guided straight by the partition member 36, and the pistons 41 and 43 can be smoothly driven on the same axis. Further, particularly in this second embodiment, since the distributor 47 is inserted inside the small diameter rod 45, unlike the first embodiment, there is no need to project the shaft portion behind the cylinder body 31, There is an advantage that the overall length of the cylinder can be further shortened.

FIG. 3 shows a modification of the second embodiment. In this double rotary cylinder, the large diameter and small diameter piston chambers 38 and 39 are provided so as to partially overlap at the same axial position, and the stroke of the second piston 43 is displaced rearward from the stroke of the first piston 41. Is set to the open position. Therefore, although the overall length of the cylinder is slightly longer than that of the second embodiment, each piston chamber 3
The same effects as those of the second embodiment can be obtained in that 8,39 are superposed at the same axial position. In the figure,
The same reference numerals as those in the second embodiment indicate the same members.

FIG. 4 shows a third embodiment in which the present invention is embodied in a double rotary cylinder. In this embodiment, the cylinder body 71 is composed of a peripheral wall member 72 and a rear wall member 73. A partition member 74 is fixed to the front surface of the rear wall member 73, and a large-diameter piston chamber 75 is provided outside the partition member 74.
However, a small-diameter piston chamber 76 is provided in the inner and outer double layers with their axial positions completely overlapped with each other.
The large piston chamber 75 accommodates the first piston 78,
A hollow rod 79 is provided on the front surface so as to protrude forward through a gap between the peripheral wall member 72 and the partition wall member 74. The second piston 80 is provided in the inner small-diameter piston chamber 76.
Is housed, and a hollow small-diameter rod 81 penetrating the partition member 74 is provided on the front surface thereof.

On the front surface of the rear wall member 73, a cylindrical portion 83 inserted into the inside of the small diameter rod 81 is projected, and a distributor for supplying hydraulic oil to the large diameter and small diameter piston chambers 75 and 76 is provided inside thereof. 84 is inserted through a bearing 85 so as to be relatively rotatable. A port portion 86 is formed at the rear end of the distributor 84, and is provided with four supply ports and a single drain recovery port 87 (two ports are shown). Each port 87 is connected to the large-diameter and small-diameter piston chambers 75 and 76 through the oil passage 88 of the distributor 84, the annular groove 89 and the communication hole 90 of the rear wall member 73, and other passages illustrated in the drawing. . Then, the first and second pistons 78, 80 and the hollow and small diameter rods 79, 81 are slid on the same axis outside and inside the partition member 74 by the hydraulic oil supplied to the piston chambers 75, 76. It has become so.

Therefore, according to the third embodiment as well, the strokes of the pistons 78 and 80 can be completely overlapped at the same axial position to shorten the overall length of the cylinder. In particular, since the distributor 84 is inserted inside the tubular portion 83, the small diameter rod 81 can be slidably guided along the outer peripheral surface of the tubular portion 83. Therefore, the distributor 84 does not need to have the guide function of the small diameter rod 81, and the total length of the cylinder can be further shortened by using the short distributor 84. Moreover, since the tubular portion 83 is provided integrally with the cylinder body 71, it can be easily straightened, and the tubular portion 83 has a small diameter even though the total length of the cylinder is shortened. The rod 81 can be accurately moved straight.

[0028]

As described in detail above, according to the first aspect of the invention, since the two piston chambers are provided so that their axial positions overlap with each other with different diameters, the overall length of the cylinder can be shortened and the spindle It has an excellent effect that the amount of protrusion when it is attached to and rotated can be reduced and the rotation can be smoothly performed.

According to the second aspect of the present invention, the two piston chambers are provided inside and outside by the partition walls, and the small diameter rod of the second piston is passed through the hollow rod of the first piston. Therefore, the overall length of the cylinder can be shortened. At the same time, there is an effect that the two pistons can be smoothly driven on the same axis by the mutual guiding action of the rods.

According to the invention of claim 3, since the distributor is inserted inside the small diameter rod, there is an effect that the total length of the cylinder can be further shortened.

According to the invention of claim 4, since the distributor is inserted into the inside of the small-diameter rod through the tubular portion of the cylinder body, the total length of the cylinder can be further shortened by using a short distributor. Instead, there is an effect that the small-diameter rod can be made to accurately advance straight by the tubular portion.

[Brief description of drawings]

FIG. 1 is a sectional view of a double rotary cylinder showing a first embodiment of the present invention.

FIG. 2 is a sectional view of a double rotating cylinder showing a second embodiment of the present invention.

FIG. 3 is a sectional view of a double rotary cylinder showing a modification of the second embodiment.

FIG. 4 is a sectional view of a double rotating cylinder showing a third embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional double rotary cylinder.

[Explanation of symbols]

1, 31, 71 ··· Cylinder body, 6 · · Partition wall, 7,
38,75 ... Large-diameter piston chambers, 8,39,76 ... Small-diameter piston chambers, 10,41,78 ... First piston, 1
1,42,79 ... Hollow rods, 12,43,80 ...
2nd piston, 14, 45, 81 ... Small diameter rod, 17
..Shaft, 18, 47, 84 .. Distributor, 33 .. Front wall member, 36, 74 .. Partition member, 83 ..

Claims (4)

[Claims] 1. In a multi-rotating cylinder in which a plurality of piston chambers are provided on a cylinder body on the same axis and slidably accommodate pistons in each piston chamber, at least two piston chambers have different diameters and axial positions are different from each other. Multiple rotation cylinders that are installed so as to overlap. 2. A multi-rotating cylinder in which a plurality of piston chambers are provided on a cylinder body on the same axis line, and pistons are slidably accommodated in the respective piston chambers, and at least two piston chambers are provided in the inner and outer double by partition walls. The first piston is accommodated in the outer large-diameter piston chamber, the second piston is accommodated in the inner small-diameter piston chamber, the hollow rod is provided in the first piston, and the small-diameter rod penetrating the hollow rod is provided in the second piston. , A multi-rotating cylinder comprising a distributor for supplying working fluid to small and large diameter piston chambers. 3. The multi-rotating cylinder according to claim 2, wherein the small diameter rod is formed in a hollow shape, and a distributor is inserted inside the small diameter rod. 4. The multi-rotating cylinder according to claim 2, wherein the small diameter rod is formed in a hollow shape, the cylindrical portion of the cylinder body is inserted inside the small diameter rod, and the distributor is inserted inside the cylindrical portion. .