JPS60207706A - Hydraulic cylinder for chucking in machine tool - Google Patents

Abstract

PURPOSE:To make a lathe system compact as a whole so as to contribute substantially to save pace, by installing bearing means for a sleeve in the main body of a rotating hydraulic cylinder for the chucking in a machine tool. CONSTITUTION:A pressure oil-supplying tube 11a and an extracting tube 11b are set up at the vertical portion 10a of a sleeve 10 connected to a tank port. Also, both bearing means 14a and 14b for the sleeve 10 are set up within the main body of the cylinder. Then, so as to move a piston 17 in the direction shown by an arrow make V and to fasten a chucking means, the pressure oil from the tube 11a is sent to the chamber alpha via oil routes 11a and 15a and 22, and the oil in a chamber beta is sent back to the tank via oil routes 15b and 12b. This construction makes the whole lathe system compact and serves substantially to save space.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary hydraulic cylinder for chunking in machine tools.

FIG. 1 shows this conventional device, in which l denotes a sleeve having a hydraulic oil supply pipe port lα and a return pipe port lb (which are alternately reversed) and a drain outlet 1C; is the main body of the cylinder, which includes the rotary pulp 2α and the cylinder box 2.
A piston 3 is slidably housed within the cylinder thickness between the cylinder cover 2C and the cylinder cover 2C.

At this time, 4α and 4b are oil passages 5α and 5b bored in the rotary pulp 2α, respectively, which are oil passages bored in the cylinder pressure 2b and the cylinder cover 2c′, and these oil passages are connected to the sleeve 1. The feed pipe port 1α and the return pipe port lbl provided in When the pressure oil is between oil passages 4α and 5
The pressure oil enters the chamber (a) side of the cylinder box through α and 5b and moves the piston 3 in the direction of arrow τ, whereas the pressure oil that had entered the chamber (b) side returns through oil path 4b. It is returned to the tank (not shown) through the pipe port 1b. This operation is performed by switching a solenoid valve (not shown) at the feed pipe port l.
The reverse operation is achieved by changing the flow of pressure oil to α and return pipe roy b, and specifically, the piston 3
Assuming that the chuck means (not shown) is gripped by sliding in the direction of arrow V 1, the chuck is released by sliding in the direction of arrow W with lb serving as the pressure oil supply side.

Reference numeral 5 denotes a guide pin fixed to the piston 3, and during the sliding movement, both ends P1P of the guide pin 5 are guided into pin holes 6α and 6b drilled on the cylinder cover and rotation nozzle side, so that they are free. Note that in the drawings, ta and 7b are ball bearings, and 8 is a sleeve cover.

In the conventional device described above, a part of the rotary valve that supplies and discharges pressure oil into the cylinder casing is configured to protrude toward the sleeve side that serves as the tank port, and is rotatably supported inside the sleeve. Therefore, the overall length t of the cylinder device becomes relatively large, which is a bottleneck in making it more compact and saving space. Furthermore, a large t is not preferable in terms of vibration damping effect.

The present invention aims to solve and eliminate the above-mentioned problems, and is characterized by forming the inside of the center of the piston into a hollow or hollow tube structure, and on the other hand, the sleeve extends a certain length from the center toward the piston. In addition to forming a protruding protrusion and providing a pressure oil supply path and a return passage in the protrusion, the protrusion is fitted into the cavity or hollow tube of the piston, and a bearing means for the sleeve is provided as a cylinder. The reason is that it is installed in one body.

Hereinafter, embodiments of the present invention will be described based on the drawings from FIG. 2 onwards.

In Fig. 2 AXB, 10 is a sleeve connected to the tank port, and the vertical part 10α has a pressure oil supply pipe 11α and a discharge pipe llb, which are used to tighten the chuck. Attaching or alternating with release action and ll
The fact that C is the drain port is the same as before, but
The sleeve lO has a shape in which the center part protrudes a certain length in the horizontal direction, and the core part has the above-mentioned conduits 11a, 11b, ll.
Oil passages 12α, 12b and drain outlet passage 12 for c.
C is formed by perforating each hole.

Reference numeral 13 denotes a cylinder lid, and in this example, the central part is a screw, a tube body 13b protrudes a certain length toward the ton side, and a ball bearing 14cL11 is mounted on the horizontal part lOb of the sleeve lO.
It is rotatably supported via a shaft 4b. 15α and 1
Reference numeral 5b indicates an oil passage bored in the pipe body 13b, the former being the oil passage 12α on the sleeve 10 side, and the latter being the oil passage 12b.
It is designed to be communicated with.

16 is a cylinder body, a piston inside the near side, and a cavity 18 is not formed in the center for fitting the horizontal part lOb of the sleeve 10 and the pipe body 13b of the rotary pulp 13, and Piston is O-ring 19.20
and 21 on the tube J3b and the cylinder] 6 Since it slides back and forth within the chambers (a) and (b) in contact with the wall surface inside the casing, 22 and 23 are connected to each chamber (a) and (o). These are through holes and notches for feeding and discharging pressure oil from the oil passage.

Specifically, the oil from the oil passage 12α flows out into the cavity 18 through the oil passage 15α, and then flows into the outer periphery of the pipe body 13b and the cavity 18.
It is fed into the chamber (a) through the gap 24 formed within the chamber (a) through the through hole. On the other hand, the oil in the chamber (b) is oil passage 15b.
, 12b from the discharge pipe.6 As can be seen in the drawings, in the apparatus of the present invention, bearing means 14a and 14b for the sleeve 10 are both provided in one cylinder body. In the drawings, 25 is a cover that covers the piston side of the bearing 14b (however, an oil passage 26 for communicating with the cavity 18 is provided at a location corresponding to the oil passage 15α), and 27 is a cover that covers the piston side of the bearing 14b. piston 1
The guide pin fixed at 7, 2 and 29 are pin holes bored in the rel and the cylinder casing 16 facing the guide pin stirrup, and are used for reciprocating sliding of the piston 17. Both ends p1 and p+ of the small guide pin 27 are guided into these pin holes 28 and 29, thereby preventing free rotation.

In this example, in order to slide the piston 17 in the direction of the arrow τ and tighten the chuck means (not shown), pressure oil is sent from the supply pipe 11α to the oil pipe 12cL.

The oil in the chamber (B) is sent into the chamber (A) through the oil passages 15α and 22, and the oil in the chamber (B) is returned to the tank side through the oil passages 15b and 1zb. On the other hand, in order to release it by sliding it in the direction of arrow W, the discharge pipe llb should be on the pressure oil feeding side, that is, the pressure oil should flow through the oil passage 1.261.
It is sent to room ← through 15b, and on the other hand, it is sent to room
) is returned to the tank side from the feed pipe 11α via the oil passages 26.15α, 12α, etc.

FIG. 3 shows another example. In the above embodiment, the central part of the cylinder lid 13 is formed into a pipe body 13b that protrudes a certain length toward the piston on the outer periphery of the sleeve lO, and an oil passage is provided inside. The protruding tubes possessed by IO are not formed. To this end, the opposite side of the piston 17' to the chuck is made to protrude a certain length toward the sleeve body, and the piston 17'
71 is rotatable on the horizontal portion lOb of the sleeve lO via ball bearings 14α and 14b. In this case, 30 is an oil passage drilled to communicate the chamber (A) and the oil passage 12α, 31 is an oil passage bored to communicate the chamber (B) and the oil passage 2b, and 32 is a sealed oil passage. It's a secret o-ring.

In this example, in order to slide the piston 17' in the direction indicated by the arrow and tighten the chuck means (not shown), pressurized oil sent from the supply pipe 11α is sent into the chamber (A) through the oil passages 12α and 30. On the other hand, the oil in the chamber (b) is
This is done by allowing the pressure oil to be returned to the tank side via 2b, and on the other hand, to release it, the pressure oil is released by making the discharge pipe llb the pressure oil feeding side. The pressure oil in the chamber (A) is fed into the chamber ← through the passages 12b and 31, and the pressure oil in the chamber (A) is discharged through the oil passage 30.12 (Z). is the internal lid.

In this example, the sleeve 10 moves outside the rotating cylinder as the piston 171 slides, but in this case, a limit insert (not shown) is provided on the movement path, and the sleeve body and By making contact, the oil passage can be freely switched by changing the position of the limit switch.

FIG. 4 shows yet another example. In this embodiment, the protruding horizontal portion lOb of the sleeve 10 is made into a hollow tube f, into which another hollow guide tube 34 is inserted. Here, the flange portion 34α of the guide tube 34 is fixed to the inner hole 35 of the piston 17' at one end, and the other end is journalled to the horizontal portion 10b of the sleeve 10 via the ball bearing 14α and the unit 4b. The structure is such that it is rotatable independently of the sleeve IO.

The other configurations of this example are the same as those of the above embodiment. This embodiment is advantageous in that the gripping means of the chuck can be used to hold a long pipe or the like into the interior e of the guide blind 34, and processing of the long object can be performed conveniently. In addition, in the drawing, this is a ball bearing interposed between the 36ri guide tube 34 and the hollow body 1.

As described above, the present invention forms the inside of the center of the piston to have a cavity or a hollow structure, and the sleeve that shoulders the oil passage is fitted into the cavity or hollow pipe of the piston, and the bearing means for the sleeve is fixed to the cylinder. As a result of being provided within the main body, the length t of the cylinder 1 can be reduced to the conventional dimension of approximately i-100, which greatly contributes to making the entire lathe apparatus more compact and saving space. Furthermore, the fact that the cylinder length t is Ill provides an excellent vibration damping effect for the core.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a conventional device, Fig. 2 A and B are longitudinal sectional views of the device of the present invention, and Fig. 2 B is a side view, and Figs. 3 and 4 are longitudinal sectional views of other examples. It is a front view. 1α...Feeding pipe port 1b...Return pipe port 209. Cylinder body 31° Piston 10, Sleeve,
12b112C, 0, oil path 13,,, cylinder lid
14α, 146. ,, Ball bearing 1 offense, 156.
,, Oil road! 6. ．． ．． Cylinder casing 170. Piston Yu8o0. Cavity 19.20,21,,Osu/G27. , guide pin 340. , guide tube patent applicant Kitayo Iron Works Co., Ltd. Figure 1 29 ” Dol 2B

Claims (1)

[Claims] (1) The center of the piston is formed into a hollow or hollow tube structure, and the center of the sleeve is formed into a protrusion that protrudes a certain length toward the piston, and the protrusion has a pressure oil supply path and a return passage. Chunking in a machine tool characterized in that, in addition to drilling a passage, the protrusion is fitted into the cavity or hollow tube of the piston, and bearing means for the sleeve is provided within one cylinder body. Hydraulic cylinder for use.