JP2011115882A - Rotary fluid pressure cylinder device for chuck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem causing a negative effect on the achievement of compactness and space-saving in the axial direction of the whole cylinder device, when the whole length in the axial direction of the cylinder device becomes relatively huge, due to being a structure of being rotatably journaled inside a sleeve by projecting a rotary valve to the sleeve side, in a rotary fluid pressure cylinder device for a chuck for driving gripping or a gripping release of the chuck installed on a main spindle of a machine tool. <P>SOLUTION: This rotary fluid pressure cylinder device includes a piston rod having an annular piston, a piston part arranged outside in the radial direction of the piston rod and constituting a cylinder by cooperating with the annular piston, a bearing arranged outside in the radial direction of the cylinder, and a sleeve part arranged outside in the radial direction of the piston part via the bearing. A cylinder chamber and a sleeve body having an outside port for introducing a hydraulic fluid, are arranged in a multistory shape in the radial direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating fluid pressure cylinder device for a chuck that drives gripping or releasing of a chuck attached to a spindle of a machine tool.

2. Description of the Related Art Conventionally, a chuck rotating fluid pressure cylinder device that rotatably holds a fluid cylinder operated by a pressure granule is known as a device that grips or releases a chuck attached to a spindle of a machine tool. . (See JP-A-6-190615)
As shown in FIG. 3, the cylinder head 130 and the rotary valve 131 are coupled in parallel in the direction of the rotation axis to form a housing that forms a cylinder chamber 107 therebetween, and the piston rod 101 is formed inwardly. An annular piston 105 provided in a disc shape on the outer periphery of the cylinder chamber 107 is provided so as to be slidable relative to the cylinder chamber 107 to constitute a piston portion.
By supplying the pressure oil to any side of the cylinder chamber 107 divided into the front and rear two chambers by the annular piston 105 and discharging the oil from the other side, the annular piston 105 (ie, the piston rod 101) can be moved in any direction. The chuck claw is driven to open and close via a draw pipe (not shown).

  Of the cylinder head 130 and the rotary valve 131 arranged in parallel in the axial direction, a sleeve 109 is provided on the outer periphery of the rotary valve 131 so as to be relatively rotatable via a bearing 103. This sleeve 109 is a sleeve body in which a connecting portion whose diameter has been increased overlaps the outer periphery of the cylinder head 130 in the axial direction and encloses it, and a drain sump 110 having an external connection port 115 is formed in the lower portion. It is positioned and fixed to 111 via bolts. These sleeve 109 and sleeve body 111 constitute a sleeve portion.

JP-A-6-190615

In such a configuration of the rotating fluid pressure cylinder device for chucks, by arranging the cylinder portion and the sleeve portion in parallel in the axial direction, the outer shape of the entire device is not increased in the radial direction, and the cylinder device is moved in the radial direction. It is designed to be compact.
However, the above-described conventional device has a structure in which the rotary valve 131 for supplying and discharging the hydraulic oil to and from the cylinder protrudes toward the sleeve 109 and is rotatably supported inside the sleeve 109. As a result, the overall length in the axial direction of the cylinder became relatively long, which was an adverse effect of downsizing and space saving in the axial direction of the entire cylinder device. Moreover, since it is long in the axial direction, it is not preferable in terms of the vibration proofing effect.

  In order to solve the above-mentioned problems, a rotating fluid pressure cylinder device for chucks according to the present invention comprises a piston rod having an annular piston and a cylinder that is provided radially outward of the piston rod and cooperates with the annular piston. A piston portion, a bearing provided radially outward of the cylinder, and a sleeve portion provided radially outward of the piston portion via the bearing are provided.

  According to the present invention, compared with the cylinder device of the conventional example, the cylinder device does not become longer in the direction of the rotation axis and can be made a compact cylinder device, which can contribute to space saving. Further, the cylinder length is reduced, and a great effect can be obtained in the vibration-proofing action.

1 is a longitudinal sectional view of a rotating fluid pressure cylinder device for a chuck according to the present invention. Sectional drawing by the AA arrow in FIG. The longitudinal cross-sectional view of the conventional rotating fluid pressure cylinder apparatus for chucks.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a rotating fluid pressure cylinder device for chucks according to the present invention.
2 is a cross-sectional view taken along arrow AA in FIG.
As shown in the cross-sectional views of FIGS. 1 and 2, the rotating fluid pressure cylinder device for a chuck according to the present embodiment is provided with a piston rod 1 connected to a draw tube (not shown) having a cylindrical shape. An annular piston 5 is provided extending from the outer periphery of the piston rod 1 outward in the radial direction of the piston rod 1.

A cylinder main body 8 including a cylinder chamber 7 which includes the annular piston 5 so as to be slidable and is divided into two front and rear chambers by the annular piston 5 is provided radially outward of the piston rod 1.
By supplying the hydraulic oil to one arbitrary side of the cylinder chamber 7 divided into two and discharging the hydraulic oil from the other side, the annular piston 5 (that is, the piston rod 1) can be moved in any direction in the axial direction. And the chuck pawl is opened and closed via a draw tube (not shown).

The longitudinal movement of the piston rod 1 in the axial direction is guided by a pair of guide rods 16 suspended and fixed to the cylinder body 8 in the cylinder chamber 7 so as to be parallel to the axial direction.
The cylinder body 8 is attached to a chuck device (not shown) with a bolt. Inside the cylinder body, there is provided an oil passage 13 through which the working oil flows to the cylinder chamber 7, and the annular piston 5 is moved in any direction of the rotation axis direction by supplying and discharging the working oil. The piston rod 1 is movable.

A sleeve portion 4 is provided on the outer side in the radial direction of the cylinder body 8 so as to be rotatable with respect to the cylinder body 8 via a bearing 3.
The sleeve portion 4 includes a sleeve 9 and a sleeve body 11.
The sleeve 9 includes an oil passage 13 and is integrally connected to the sleeve body 11 with a bolt.
The sleeve body 11 forms a drain sump 10 having an external connection port 15 in the lower part, and is provided with an oil passage communicating with the oil passage 13 of the sleeve 9, and sends the hydraulic oil of the cylinder together with the sleeve 9 to the piston portion 2. It is designed to discharge.
The hydraulic fluid is supplied to the cylinder chamber 7 through an external port 17 provided in the sleeve body 11, an oil passage 13 formed in the sleeve 9, and an oil passage 19 provided in the cylinder body 8. It has come to be.

When opening and closing the chuck claw, the cylinder device is driven as a drive source for the chuck claw operation.
A hydraulic device for supplying and discharging hydraulic oil to and from the cylinder device is provided outside the machine tool, and hydraulic piping is connected to an external port 17 of the sleeve body 11 of the cylinder device.
The hydraulic oil supplied to the sleeve body 11 is sent to one side of the cylinder chamber via the oil passages 18, 13, and 19, and the hydraulic oil on the other side is sent to the cylinder via the oil passages 18, 13, and 19 of another system. Discharged from the other side of the chamber.
By the action of the hydraulic oil, the annular piston 5 is pressed in the axial direction, and the piston rod 1 formed integrally with the annular piston 5 is moved in the axial direction.

As described above, the cylinder device of the present invention is provided with the piston portion 2 having the cylinder chamber 7 radially outward of the piston rod 1, and introduces hydraulic oil radially outward of the piston portion 2. A sleeve portion 4 having an external port 17 is provided, and the piston rod 1, the piston portion 2, and the sleeve portion 4 are configured vertically in a multilayered manner.
In the cylinder device of the conventional example, a cylinder chamber having a large space for constituting a cylinder and a sleeve having an external port for introducing hydraulic oil from the outside are arranged in parallel in the rotation axis direction. The length in the core direction (cylinder length) was long.

However, according to the structure of this invention, the sleeve body 11 which has the cylinder chamber 7 and the external port 17 which introduce | transduces hydraulic fluid is provided in the radial direction in multiple layers.
Thereby, compared with the cylinder apparatus of a prior art example, it cannot become long in a rotating shaft direction, but it can be set as a compact cylinder apparatus, and it can contribute to space saving.
Further, according to the configuration of the present invention, the non-rotating sleeve portion 4 and the rotating piston portion 2 are arranged perpendicular to the radial direction and are not arranged in parallel in the rotational axis direction as in the conventional cylinder device. .
Therefore, the piston portion 2 is rotated without being greatly affected by the vibration generated by the rotation, and the driving force can be transmitted without applying an excessive load to the chuck.

DESCRIPTION OF SYMBOLS 1 Piston rod 2 Piston part 3 Bearing 4 Sleeve part 5 Annular piston 7 Cylinder chamber 8 Cylinder body 9 Sleeve 11 Sleeve body 13 Oil passage 17 External port

Claims (1)

A rotating fluid pressure cylinder device for a chuck that drives a chuck attached to a spindle of a machine tool, wherein the piston rod has an annular piston, and is provided radially outward of the piston rod in cooperation with the annular piston. A rotating fluid pressure for a chuck, comprising: a piston portion constituting a cylinder; a bearing provided radially outward of the cylinder; and a sleeve portion provided radially outward of the piston portion via the bearing. Cylinder device.

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