KR20090053678A - Clamp sleeve and clamp device for indexing device - Google Patents

Abstract

It is to provide a clamp sleeve and a clamp device that can maintain the clamp force even if a crack occurs in the clamp portion.

Cylindrical part disposed in the annular space between the rotating body and the frame, Clamp surface provided in the circumference of the cylindrical part facing the rotating body, Annular groove provided in the circumferential direction on the circumferential side opposite to the clamp surface, Clamp surface And a clamp sleeve having a thin thickness portion fixed at the bottom of the annular groove and a frame fixing portion provided at one end of the cylindrical portion, wherein the other end portion of the cylindrical portion is provided with a deformation force acting portion that receives a force in the compression or the like direction, and has a thin thickness. The part is a shape in which the midline of the entire axial direction of the locus of the thickness midpoint satisfies the following conditions. As the end region, the average trajectory of the middle line in each region in the radial direction is created, and the distance between the average trajectory of each region and the pickled surface of the rotor is center and middle. , Largely in the order of the end portion area.

Description

Clamp device of clamp sleeve and ejector {CLAMP SLEEVE AND CLAMP DEVICE FOR INDEXING DEVICE}

TECHNICAL FIELD This invention relates to the clamp apparatus of the ejection apparatus used for a machine tool, and the clamp sleeve used as a part of the clamp apparatus.

A conventional ejection device comprises a face (frame) having a central through hole, a table on which a rotating body is rotatably supported inside the base, and a clamp device interposed between the outer rotation axis of the table and the base. There is (patent document 1).

[Patent Document 1] Japanese Patent Laid-Open No. 2002-103181

The clamp device is composed of a clamp member (clamp sleeve) and a hydraulic circuit (strain force generating means) for deforming the clamp member. The clamp member has a cross-sectional U-shape having a clamp portion of a thin thickness portion, and forms an annular hydraulic chamber outside the clamp portion. Since the clamp member has a cylindrical shape, and its inner surface is a friction surface, the clamp member is hydraulically applied to the hydraulic chamber to bend the clamp portion to hold the outer rotating shaft.

By the way, since the clamp part frictions the inner surface with the outer rotating shaft and is clamped by the friction, when the clamp part is used, fatigue of the clamp part of thin thickness may progress and a crack may arise. In this case, since the clamp part is clamped by applying hydraulic pressure to the outer hydraulic chamber, oil leaks from the cracking point, and the frictional force rapidly decreases with it, and the clamping force cannot be sufficiently obtained.

The present invention was developed in view of the above situation, and a problem is to provide a clamp sleeve and a clamp device that can sustain the clamp force even if a crack occurs in the clamp portion.

Claims 1 to 6 of the present invention, the clamp surface is provided in the circumference of the cylindrical portion disposed in the annular space between the rotating body and the frame and the inner or outer peripheral portion of the cylindrical portion facing the rotating body, It is provided in the annular groove which is continuously installed along the circumferential direction in the circumferential direction on the opposite side to the circumferential side of the cylindrical part to which the clamp surface is installed, and the thin thickness part which is determined by the bottom surface of a clamp surface and the annular groove, and one end of a cylindrical part. It is assumed that the clamp sleeve has a fixing portion to the frame to be made.

In the invention of claim 1, when the other end portion of the cylindrical portion is provided with a deformation force acting portion that receives a force in the compression direction or the pulling direction applied to the axial direction, it is assumed that the pickled surface of the rotating body is parallel to the axial direction. The thin thickness portion is formed such that the midline of the entire axial direction of the locus in the locus of the thickness in the cross section in the axial direction forms a shape that satisfies the first condition, and the first condition is the axis of the intermediate line. Divided into five regions divided into five directions, and the five regions are defined as the center region, the middle region, and the end region from the center to the end, and form an average trajectory in which the middle line in each region is averaged in the radial direction of the rotating body. The distance between the average trajectory of each region and the picked-up surface of the rotating body is increased in the order of the center region, the middle region, and the end region.

"When assuming that the pickled surface of a rotating body is parallel to an axial direction" means the case where the shape of a general pickled surface is assumed.

The thin thickness portion may form an intermediate line in the entire axial direction because the amount of change in the radial direction of the rotating body of the midline of the five regions is uniformly formed in the entire region, but the thin thickness portion is easy to deform. In order to do this, it is preferable to carry out the invention of Claim 2. That is, the thin thickness portion is formed such that the intermediate line in the entire axial direction forms a shape that satisfies the second condition, and in the second condition, the amount of change in the radial direction of the rotating body of the middle line of the five regions is the center region, It is larger in the order of the intermediate region and the end region.

Although the intermediate line of the axial whole region of a thin thickness part may be a form which has a corner part, the stress at the time of deformation becomes easy to concentrate on a corner part. Therefore, in order to avoid stress concentration and to improve durability, it is preferable to carry out as invention of Claim 3. That is, the bottom surface or clamp surface of the annular groove is provided so that the intermediate line of the entire axial direction of the thin thickness portion forms a continuous continuous curve.

Although the bottom face of the annular groove may be flat, in order to make it easier to deform the thin thickness portion, as in the invention of claim 4, the bottom face of the annular groove is pickle of the rotating body as it faces toward the center from both ends of the thin thickness portion. It is preferable to be installed so as to be close to the lamp surface.

Although the clamp surface may be flat, in order to make it easy to deform the thin thickness portion, as in the invention of claim 5, the clamp surface is brought closer to the pickled surface of the rotating body as it faces toward the center from both ends of the thin thickness portion. It is preferable to install.

The thin thickness portion may be a continuous form over the entire circumferential direction of the cylindrical portion, but in order to be easily deformed, it is preferable that a plurality of slits are provided in the thin thickness portion at intervals in the circumferential direction in order to facilitate deformation. .

In addition, the invention of claim 7 and 8 of the present invention comprises a clamp sleeve accommodated in the annular space between the rotating body and the frame, and the deformation force generating means for applying a force to the clamp sleeve, the clamp sleeve is a ring Cylindrical portion disposed in the shape space, a clamp surface provided in the circumferential portion of the inner portion or the outer circumferential portion of the cylindrical portion facing the rotating body, and a circumferential portion on the circumferential side opposite to the circumferential portion of the cylindrical portion where the clamp surface is provided. On the premise of a clamping device of a take-out apparatus, having an annular groove continuously installed along a direction, a thin thickness portion determined by the clamp surface and the bottom surface of the annular groove, and a fixing portion to a frame provided at one end of the cylindrical portion. do.

In the invention according to claim 7, the clamp sleeve is provided at the other end of the cylindrical portion, where a deformation force acting portion that receives a force in the pulling direction applied to the axial direction is provided, and the pickled surface of the rotating body is parallel to the axial direction. The thin thickness portion is formed such that the intermediate line in the entire axial direction of the locus of the middle point of the thickness in the cross section in the axial direction forms a shape that satisfies the first condition, and the first condition is the intermediate line. Divided into five regions divided into five equal parts in the axial direction, the five regions are defined as the center region, the middle region, and the end region from the center to the end, and an average trajectory is formed by averaging the midline in each region in the radial direction of the rotor. The distance between the average trajectory of each region and the picked-up surface of the rotating body was increased in the order of the center region, the middle region, and the end region, and the clamp sleeve was placed in the annular space. In the above state, when a predetermined amount of force in the pulling direction is applied with the deformation force generating means interposed therebetween, the clamp surface of the thin thickness part retreats in a direction away from the pick clamp surface of the rotating body and rotates. Is set to the unclamp state, and when the force from the deformation force generating means is released, the clamp surface of the thin-thick part moves toward the pressing state of the clamping surface of the rotating body by the restoring force, and the rotating body is clamped. It is characterized by.

The invention of claim 8 is clamped and unclamped in a manner opposite to the invention of claim 7, that is, the clamp sleeve is compressed in the deformation force acting portion with the deformation force generating means in a state accommodated in the annular space. When a predetermined amount of force is applied to the direction, the clamp surface of the thin portion is moved closer to the picked surface of the rotating body, and the rotating body is clamped, and the force from the deformation force generating means When released, the clamping surface of the thin-thick portion retreats in a direction away from the clamping surface of the rotating body by the restoring force, and the rotating body is unclamped.

In the invention of claim 1, since the shape of the thin thickness portion of the cylindrical portion satisfies the first condition, when the force in the compression direction or the pulling direction in the axial direction is applied to the deformation force acting portion corresponding to the other end of the cylindrical portion, The thin thickness portion is stably deformed to change the curvature of the midline, and the diameter of the clamp surface of the thin thickness portion is stabilized to expand or contract. When using this clamp sleeve, the rotating body does not need to apply hydraulic pressure to the annular groove of the cylindrical portion. Can be clamped or unclamped. Therefore, even when a crack is formed in a thin thickness part during use, some clamp force can be sustained and it can be used over comparatively long period of time.

In the invention of claim 2, since the shape of the thin-walled part satisfies the second condition, it is easy to deform the thin-walled part and can be clamped and unclamped even if the force applied to the deformation force acting part is reduced.

According to the third aspect of the present invention, the middle line of the entire axial direction of the thin thickness portion is formed in a continuous curve shape by the shape of the bottom surface or the clamp surface of the annular groove. The strain force is applied to the entire thin thickness portion, and as a result, durability can be improved.

According to the invention of claim 4, since the bottom face of the annular groove is provided so as to be closer to the pick-clamp surface of the rotating body from both ends of the thin thickness portion toward the center, it is thinner than the case where the bottom face of the annular groove is flat. It becomes easy to deform a thickness part.

According to the invention of claim 5, since the clamp surface is provided so as to be closer to the pick-clamp surface of the rotating body as it goes from both ends to the center of the thin thickness portion, it is easier to deform the thin thickness portion than when the clamp surface is made flat. Lose.

Since the invention of Claim 6 uses the thin thickness part which provided two or more slits at intervals in the circumferential direction, it becomes easy to deform a thin thickness part compared with the absence of a slit.

Since the invention of claim 7 uses the other end of the cylindrical portion of the clamp sleeve of claim 1 that receives the force in the pulling direction applied in the axial direction, the other end of the cylindrical portion, the deformation force while maintaining the effect of the invention of claim 1 When the force in the pulling direction is applied to the acting portion, the rotating body can be unclamped, and the rotating body can be in the clamping state when the normal state is released from the pulling direction applied to the deformation force acting portion.

The invention of claim 8 also uses the other end of the cylindrical portion of the clamp sleeve of claim 1 provided with a deformation force acting portion that receives the force in the compression direction applied in the axial direction of the clamp sleeve of claim 1 in the axial direction. While retaining the force, the rotating body can be clamped when the force in the compression direction is applied to the deformable force acting portion, and the rotating body can be unclamped in a normal state in which the force in the compression direction applied to the deformation force acting part is released. Can be.

The extraction | extraction apparatus 1 can mention the index table apparatus shown in FIG. 1 as an example. The extractor 1 has a frame 2 and a rotating body 3 rotatably supported by the frame 2. Further, the ejection device 1 is provided between the frame 2 and the rotating body 3 via a bearing 4, a clamp device 5, and a rotation driving device 6.

The frame 2 is provided with the storage chamber 2a which arrange | positions a part (rotation shaft 3a) of the rotating body 3 inside, and surrounds the outer side of the rotation shaft 3a at intervals. The storage chamber 2a is a stepped shape in which the inner diameter projects in the flange shape in several places as a through hole.

The rotating body 3 is comprised from the rotating shaft 3a and the one table 3b which fixes to the end (upper end) of the rotating shaft 3a with a bolt etc.

The rotating shaft 3a is cylindrical and has a stepped shape in which the outer shape protrudes in a flange shape. Moreover, the rotating shaft 3a makes the inner periphery surface the shaft through-hole 3c, and is arrange | positioned concentrically in the accommodating chamber 2a of the frame 2. As shown in FIG.

The one-table 3b is a shape which protrudes in a flange shape from the rotating shaft 3a by mounting a workpiece | work processed by a machine tool, and radially centers the table through-hole 3d continuous to the shaft through-hole 3c. Installing on

As described above, the frame 2 and the rotational shaft 3a protrude to the opposite circumferential portions in the form of a flange, whereby a plurality of concentric circular space portions 21a, 21b, 21c, 21d are disposed between them. ) Are spaced apart in the axial direction.

In the figure, in the lowermost space portion 21a, between the annular plate 22 fixed to the inner circumference of the frame 2 with a bolt or the like, between the annular plate 22 and the rotation shaft 3a. An annular seal member 23 fitted in the housing is accommodated.

The second space portion 21b from below receives the rotation drive device 6. The rotation drive device 6 uses a worm mechanism, and is composed of a worm wheel 6a, a worm spindle 6b, and a servo motor (not shown), and the worm wheel 6a is fixed to the outside of the rotation shaft 3a. The worm spindle 6b is engaged with the outer side of the worm wheel 6a. The worm wheel 6a is provided between the rotary shaft 3a and the worm wheel 6a in the axial direction by interposing a gap member 6c for engagement adjustment, and employing a gap member 6c of appropriate thickness. ), Adjust the position in the axial direction to the appropriate engagement state. On the other hand, the output shaft of the servomotor (not shown) is connected to the worm spindle 6b, and the ejection angle of the rotating shaft 3a (one table 3b) is controlled by the drive amount of the servomotor.

The third space portion 21c from below receives the bearing 4. Specifically, the bearing 4 is a cross roller bearing in which a roller, not shown, is disposed between the inner wheel 4a and the outer wheel 4b. Reference numeral 4c denotes a pressing plate for fixing the outer wheel 4b.

21 d of uppermost remaining spaces hold the 1st example of the clamp apparatus 5. The first example of the clamp device 5 has an axial direction at the clamp sleeve 7 for fixing one end (the upper end in the drawing) to the frame 2 and the other end (the lower end in the drawing) of the clamp sleeve 7. Therefore, it is comprised by the deformation force generating means 8 which applies a force and deforms. 21 d of uppermost spaces make the upper space the accommodating space of the clamp sleeve 7, and the lower space is the accommodating space of the deformation force generating means 8. As shown in FIG.

The deformation force generating means 8 is comprised from the fluid flow path 8a formed in the frame 2, and the piston 8b arrange | positioned in the cylinder chamber 8a1 of the secondary side edge part of the flow path 8a. The piston 8b is an I-shaped ring in one cross section in the axial direction, and has a concave portion 8b1 that becomes a hydraulic chamber on its bottom face in a concentric shape, and an O-ring 9 in the groove of the inner and outer circumferences. Is wearing. The O-ring 9 is also used at locations other than the piston 8b and prevents oil leakage. On the other hand, the cylinder chamber 8a1 is corresponded to the space below the uppermost space 21d.

The clamp sleeve 7 has a cylindrical portion 71 accommodating concentrically in the upper space (ring-shaped space) of the uppermost space 21d and a flange shape projecting outward from one end of the cylindrical portion 71. Of the fixing portion 72, the annular groove 73 continuously formed in the outer circumferential surface of the cylindrical portion 71 along the circumferential direction, and the clamp surface 74 opposite to the annular groove 73. And the deformable thin thickness portion 75 provided between the clamp surface 74 and the annular groove 73 and the thick force deformation portion 76 provided at the other end of the cylindrical portion 71. It consists.

On the other hand, in the lower part of the one-table 3b, the ring-shaped end surface 3f which extends radially inward from the lower end of the outer periphery end 3h and the axially downward direction with respect to the outer periphery end 3h are stepped. It has the cylinder part 3g extended toward the 1st outer peripheral surface 3j provided with the diameter smaller than the outer diameter of the outer peripheral edge part 3h in the cylinder part 3g, and a slightly smaller diameter than this outer diameter. A second outer circumferential surface 3m that extends downward in the axial direction is formed, and a part of the second outer circumferential surface 3m forms a pick-up clamp surface 3e that is clamped by a clamp sleeve 7 described later. .

On the other hand, the clamp sleeve 7 is assembled to the upper end of the frame 2, and can receive the cylinder portion 3g of the one table 3b inside the cylindrical portion 71 of the clamp sleeve 7. Is installed. On the other hand, the second outer circumferential surface 3m of the one table 3b, in other words, the picked-up clamp surface 3e does not contact with the clamp surface 74 of the clamp sleeve 7 in the normal state described later. It constitutes a so-called runaway surface of a diameter slightly smaller than this.

The cylindrical part 71 of the clamp sleeve 7 forms both ends (upper end and lower end) as a thick thickness part, and in the area | region between both end parts, the annular groove 73 is formed more than the outer periphery side. It is provided and forms the thin thickness part 75 determined by the inner peripheral surface of the cylindrical part 71. As shown in FIG. The inner circumferential surface of the thick portion of the cylindrical portion 71 is provided to have a small gap between the outer circumferential surface of the circular table 3b in a part of the axial direction. In the first outer circumferential surface 3j of the cylinder portion 3g of the round table 3b, an outer groove 3k extending in the circumferential direction near the center of the axial region is engraved facing the cylindrical portion 71. The outer groove 3k is fitted in the order of the O ring 9 and the ring 71b, and the outer circumferential surface of the ring 71b is placed on the inner circumference of the thick portion of the cylindrical portion 71. Installed very lightly. Since the contact between the inner circumference of the cylindrical portion 71 and the outer circumference of the ring 71b is very light, the rotation of the rotary shaft 3a is not prevented. On the other hand, the boundary between the cylindrical portion 71 and the fixing portion 72 in the clamp sleeve 7 is not clearly defined, but the extent that one end of the cylindrical portion 71 forms a part of the annular groove 73. If it is in, it is no problem to grasp the upper portion thereof as the fixing portion 72.

The lower end of the cylindrical part 71 is between the 2nd outer periphery 3m of the roundtable 3b, Preferably the inner periphery of the frame 2 so that the rotation of the roundtable 3b may not be prevented. A gap is provided between the two.

When the fixed portion 72 is viewed as a cross-sectional shape, the radially outer portion protrudes from the circle table 3b, and the radially inner portion is the first outer circumferential surface 3j of the circle table 3b. It is arranged to face). In the radially outer portion of the fixing portion 72, it is fixed to the frame 2 with a plurality of bolts and the like disposed at intervals in the circumferential direction. In addition, the upper end surface of the fixing part 72 is provided with a micro clearance so that rotation does not interfere with the end surface 3f of the one-table 3b. The first groove 72a and the second groove 72b are provided in both the upper end surface of the fixing portion 72 and the end surface 3f of the one table 3b to prevent intrusion of foreign matter such as powder cut out from the gap. The other ring 72c, which is formed concentrically to face each other separately and extends over the first groove 72a and the second groove 72b, for example, a synthetic resin, or the like, as the second groove 72b. ) Is accommodated in a state of being in light contact with the bottom of the other first groove 72a. Moreover, while the end part 2b is formed in the upper end surface of the frame 2, the O-ring 9 is arrange | positioned between the end part 2b and the lower end surface of the fixing part 72, and from this clearance gap Prevents intrusion of foreign matter or oil leaks, such as cut powder.

The annular groove 73 forms an outer circumferential portion of the thin thickness portion 75, and is formed by attaching a gentle R (rounding) to the portion connecting the side circumferential surface (upper and lower surface in the figure) to the bottom surface. will be. In addition, the bottom face is formed in a cross-sectional shape of one cross section which is curved or extended inward in an arc shape so as to be closer to the pick-clamp surface 3e from both ends of the thin thickness portion 75 toward the center. .

The clamp surface 74 forms an inner circumferential portion of the thin thickness portion 75, and has the same shape as the annular groove 73 except that R is absent. The upper and lower ends of the clamping surface 74 are not the parts to be clamped strictly, but the runaway surface 75b.

The thin part 75 corresponds to the middle part of the axial direction of the cylindrical part 71, and is formed in the shape which extends toward a pickle shape or bow shape toward the pickle ramp surface 3e. In detail, as shown in FIG. 2, the thin-walled part 75 has a axial direction of the locus of the intermediate point of the thickness in the cross section of the axial direction when the clamped surface 3e is parallel to the axial direction. The intermediate line 75a of the whole area | region is formed so that it may form the shape which satisfy | fills next 1st conditions and 2nd conditions.

The first condition is divided into five areas A to E that divide the middle line 75a into five equal parts in the axial direction, and the five areas are divided from one end to the other end, and the end area A, the middle area B, the center area C, and the middle. A region D and an end region E are formed, and an average trajectory obtained by averaging the middle line 75a in each region in the radial direction of the rotating body is formed, and the average trajectory of each region and the picked-up surface 3e of the rotating body 3 are defined. The distance LA to LE from the distance LC in the middle region C, the distances LB, LD in the middle region B and the middle region D, and the distances LA and LE in the end region A and the end region LE, respectively. To enlarge. As a result, when a force to deform in the compression direction acts on the thin thickness portion 75 of the clamp sleeve 7, the curvature of the middle line 75a of the thin thickness portion 75 is further changed as a whole. To be modified.

The second condition is that the amount of change ΔA to ΔE in the radial direction of the rotating body of the middle line 75a of the five regions is the amount of change ΔC in the central region C, the amount of change ΔB in the intermediate region B and the intermediate region D, The change amounts ΔA and ΔE in ΔD, the end region A and the end region E are increased in order. Moreover, by providing in this way, the thin thickness part 75 will deform | transform more reliably as a whole area.

In addition, the thin thickness portion 75 of FIG. 1 has a bottom surface and a clamp surface of the annular groove 73 so that the intermediate line 75a over the entire axial direction forms an overall continuous curved curve shape. 74) may be installed.

The deformation force acting portion 76 corresponds to the other end of the cylindrical portion 71, and the inner circumferential portion and the outer circumferential portion are provided with a gap from the circular table 3b and the frame 2. The deformation force acting portion 76 is pushed by the piston 8b disposed on its lower end surface, but there is a gap inside and outside, and it is easy to move up and down. On the other hand, the clamp sleeve 7 and the piston 8b are made of alloy copper for mechanical structures containing, for example, nickel, chromium, or the like as a metal material, and are produced by cutting or the like. ) Is produced by cutting by using steel or cast iron such as carbon steel for mechanical structure.

In the first example of the clamp device 5 described above, when the oil is supplied to the flow path 8a from the outside of the frame 2 at a predetermined pressure during the clamping, the piston 8b is raised to raise the clamp sleeve 7. A force that pushes the deformable force acting portion 76 and deforms in the compression direction against the thin thickness portion 75 of the clamp sleeve 7 acts. Since the bottom face of the annular groove 73 and the clamp face 74 are provided so that the middle line 75a of the thin thickness portion 75 satisfies the above first condition, when the force in the compression direction is applied, The thin thickness 75 deforms so that the curvature of its midline 75a becomes smaller throughout the region. In this deformation | transformation state, the clamp surface 74 of the thin thickness part 75 steadily goes to the direction which comes close to the pick-clamp surface 3e of the rotating body 3, and finally, by the deformation | transformation, the clamp surface 3e ) From the outside circumference. The hydraulic pressure supplied to the flow path 8a is set to such an extent that the thin part 75 is not buckled and bent by the deformation force.

On the other hand, when releasing the pressure of the oil supplied to the flow path 8a, the force acting in the compression direction of the thin thickness portion 75 with the piston 8b therebetween is reduced, and the clamp sleeve 7 The piston 8b is lowered by the restoring force of {thin thickness 75}, and the thin thickness 75 deforms so that the curvature of its middle line 75a returns to its original large state as a whole. The clamp surface 74 of the thin thickness portion 75 retreats from the picked clamp surface 3e of the rotating body 3 to make the rotary shaft 3a rotatable. FIG. 1 shows the normal state of the clamp device 5, and the clamp surface 74 and the clamped surface 3e are spaced apart or are in very light contact with the piston 8b lowered. It shows the state.

As a 2nd example of the clamp apparatus 5, as shown in FIG. 3, the clamp sleeve 7 made the fixed part 72 and the cylindrical part 71 separate products. The fixed portion 72 has an L-shaped cross section in which the radially inner portion protrudes toward the cylindrical portion 71. The cylindrical section 71 is provided with one end face in a cylindrical shape, with one end face facing the inner body 71c and the outer body 71d having a symmetrical shape in and out. The shape of the inner body 71c corresponds to the shape of the cylindrical portion 71 of the first example.

In the second example of the clamp device 5 described above, oil is supplied to the flow path 8a at a predetermined pressure during clamping, and the inner body 71c and the outer body 71d are compressed by the rising of the piston 8b. In the direction. In this deformation | transformation state, the cylindrical cross section of an inner side 71c and an outer side 71d will expand inward and outward, respectively, and the inner side 71c will fit in the pick-up clamp surface 3e of the rotating shaft 3a. The outer body 71d is in close contact with the frame 2 to support the inner body 71c at both ends in the axial direction. 3 has shown the steady state, and has shown the unclamped state in the falling state of the piston 8b by opening of hydraulic pressure.

As shown in FIG. 4, the third example of the clamp device 5 includes the clamp sleeve 7 and the piston 8b as an integral part, and in the case of the steady state, the restoring force of the thin thickness portion 75. By clamping the one-table 3b at all times, pressure oil is supplied to the flow path 8a from the other end part (semi-cylinder part side) of the piston 8b auxiliary. In other words, the clamp sleeve 7 is in a so-called tightened state with respect to the one table 3b, and a suitable clamping force can be obtained by supplying an appropriate pressure oil as necessary. Moreover, when unclamping the round table 3b with the thin thickness part 75, while opening the pressurized oil to the flow path 8a, the unlocking part which passes through the one end side (cylindrical part 71 side) of the piston 8b is carried out. Pressure oil is supplied from the clamp passage 8c. The unclamp passage 8c is formed in the frame 2 at a distance from the flow path 8a. In addition, FIG. 4 has shown the unclamping state.

As shown in FIG. 5, the fourth example of the clamp device 5 differs from the third example in that the cross section of the thickness of the thin portion 75 of the clamp sleeve 7 is changed in several places. It is a point at which it is made into a shape and clamped in multiple places in the axial direction.

The thin-walled portion 75 here is provided with a zig-zag shape (staggered) at both the inner and outer circumferential portions of a small groove 75c having a cross-sectional C-shape in a concentric manner and spaced along the axial direction. Doing. In detail, the inner circumference of the thin thickness portion 75 is provided symmetrically with small grooves 75c spaced apart on both sides in the axial direction, and is formed at the end of the one-sided ridge in a bulge at the end side than the small grooves 75c. have. The outer peripheral part of the thin thickness part 75 is formed in one cross-section bow shape, and the small groove 75c is provided in the center of an axial direction.

As shown in FIG. 6, the clamp sleeve 7 has various kinds of modifications. In addition, hatching is abbreviate | omitted in order to specify the intermediate | middle line 75a except the (c) drawing. The clamp sleeve 7 of FIG. 6A differs from the clamp sleeve 7 of the first example in that the clamp sleeve 7 is formed to have an inclination that widens toward the opening side with respect to the side circumferential surface of the annular groove 73. The thin portion 75 of the clamp sleeve 7 is formed in a circular or elliptical bow shape.

The clamp sleeve 7 of FIG. 6 (b) is provided with a plurality of small grooves 75c concentrically spaced along the axial direction only in the inner circumferential portion of the thin thickness portion 75. It is different from the clamp sleeve 7 of a). Although the small groove 75c is C-shaped in cross section in the figure, other shapes such as square and wedge may be used.

In the clamp sleeve 7 of FIG. 6 (c), the slits 75d extending in the axial direction are provided in the thin thickness portion 75 at equal intervals in the circumferential direction of the cylindrical portion 71. It is different from the clamp sleeve 7 of (a). Thus, a plurality of slits 75d extending in the axial direction are provided in the circumferential direction, or the groove is formed in the circumferential direction as shown in Figs. 6 (b) and 6 (c) and later (d). It becomes possible to perform the deformation | transformation in the direction from which the surface 74 becomes closer to the pickle ramp surface 3e of the rotating body 3 with a smaller force.

The clamp sleeve 7 of FIG. 6 (d) forms a plurality of small grooves 75c not only on the inner circumferential surface of the thin thickness portion 75 but also on the outer circumferential surface thereof. It is different from the sleeve 7.

The clamp sleeve 7 of FIG. 6 (e) is formed in a uniform thickness by forming the thin thickness portion 75 as a wave shape without undulation, and the clamp sleeve 7 used in the fourth example of the clamp device 5. )

The clamp sleeve 7 of FIG. 6 (bar) has the inner circumferential portion of the thin thickness portion 75 as the clamp surface 74 parallel to the axial direction, and makes the groove width of the annular groove 73 uniform in the depth direction. What is formed is different from the clamp sleeve 7 of FIG.

The clamp sleeve 7 shown in FIG. 7 is formed by assembling and integrating a plurality of ring-shaped parts arranged up and down. Five parts 7a to 7e are used except for bolts. In the middle, the first part 7a is originally a cylindrical thin plate wheel, and by fixing the upper and lower ends of the axial direction to other parts, the one end portion of the axial direction is recessed in the axial direction and the one end surface is bowed. This constitutes a thin thickness portion 75 in the shape. The uppermost large second part 7b is a fixing part 72, and the rest is a foundation on which the inner circumferential surface of one end of the thin plank wheel is placed. The third third component 7c from the top is a stop for pressing the outer circumferential surface of one end of the thin plank wheel. By fixing the second component 7b and the third component 7c with bolts, one end of the thin plank wheel is held between the two components 7b and 7c, and not only the fixing portion 72 but also the cylinder. One end of the portion 71 is formed, and the upper holding space 7f at one end of the thin plank wheel is formed between the two parts 7b and 7c, and the shape of the upper holding space 7f is one end of the thin plank wheel. We match to negative shape. The fourth fourth part 7d at the bottom is a foundation on which the inner circumferential surface of the other end of the thin plank wheel (lower end of the city) is placed. Moreover, the 5th component 7e of 2nd from the bottom is a stopper which suppresses the outer periphery surface of the other end of a thin plank wheel. By fixing the fourth component 7d and the fifth component 7e with bolts, a deformation force acting portion 76 is formed, and a thin board is formed between the fourth component 7d and the fifth component 7e. The lower holding space 7g is formed below the other end of the wheel, and the shape of the lower holding space 7g is matched with the shape of the other end of the thin plank wheel.

This invention is not limited to the said embodiment. For example, in the above-described embodiment, the rotary shaft 3a in the inner side is provided to be clamped from the outside by the clamp sleeve 7, but the ejection apparatus 1 that reverses these internal and external relations, that is, rotation The rotating shaft 3a of the whole 3 is provided in a cylindrical shape, and it is applicable also to the extraction apparatus 1 which clamps the rotating shaft 3a from the inside with the clamp sleeve 7. In addition, although it drives indirectly using the worm mechanism for the drive of the rotating body 3, it uses the direct drive mechanism, the DD motor assembled in the space between the so-called rotating shaft 3a and the frame 2, and is used. It may be.

In addition, in the case where the power failure occurs during the use of the power take-off device 1 and the oil pressure decreases, in order to stop the rotation of the rotation shaft 3a automatically, the so-called insertion device 1 is the same as the above-described third and fourth examples. The clamping device 5 which uses a constitution may be used.

On the other hand, the ejection apparatus 1 is applicable not only to an index table but also to a so-called U-axis head (a processing shaft head which divides and drives a spindle head to which a tool is attached) of a 5-axis processing machine.

1 is a cross-sectional view showing a first example of the clamp device of the present invention.

FIG. 2 is an explanatory view of the clamp sleeve of FIG. 1. FIG.

3 is a cross-sectional view showing a second example of the clamp device of the present invention.

4 is a cross-sectional view showing a third example of the clamp device of the present invention.

5 is a cross-sectional view showing a fourth example of the clamp device of the present invention.

6A to 6B are cross-sectional views of a main part showing another example of the clamp sleeve.

7 is a cross-sectional view of an essential part showing a modification of the clamp sleeve.

<Description of the symbols for the main parts of the drawings>

1: extraction device

2: frame

2a: accommodation room

2b: end

21a: space part

21b: space part

21c: space part

21d: space part (ring-shaped space)

22: plate

23: sealing member

3: rotating body

3a: axis of rotation

3b: one table

3c: shaft through hole

3d: table through hole

3e: Pick clamp surface

3f: end section

3g: cylinder part

3h: outside circumference

3j: first outer circumference

3m: 2nd outer circumference

3k: Outer groove

3m: if you run away

4: bearing

4a: inner wheel

4b: outer wheel

4c: pressing plate

5: Clamp Device

6: rotary drive device

6a: worm wheel

6b: Worm Spindle

6c: gap member,

7: clamp sleeve

7a: first part

7b: second part

7c: third part

7d: fourth part

7e: fifth part

7f: Upper space

7g: Lower space

71: cylindrical part

71b: ring

71c: inner body

71d: outer body

72: fixed part

72a: first home

72b: the second groove

72c: ring

73: annular groove

74: clamp surface

75: thin thickness

75a: middle line

75b: run away

75c: small groove

75d: slit

76: strain acting portion

8: strain generating means

8a: Euro

8a1: cylinder chamber

8b: piston

8b1: recess

8c: passage for unclamping,

9: O ring

Claims (8)

It is provided in the cylindrical part 71 arrange | positioned in the annular space 21d between the rotating body 3 and the frame 2, and the circumferential part which opposes a rotating body among the inner or outer peripheral parts of a cylindrical part. A ring-shaped groove 73 which is continuously installed along the circumferential direction on the circumferential side opposite to the circumferential portion of the cylindrical portion on which the clamping surface 74 and the clamping surface are provided, and the thin face fixed to the bottom of the clamping surface and the annular groove. In the clamp sleeve which has the thickness part 75 and the fixing part 72 to the frame provided in the one end part of a cylindrical part, The other end of the cylindrical portion is provided with a deformation force acting portion 76 that receives a force in the compression direction or the pulling direction applied in the axial direction, In the case where the picked-up clamp surface 3e of the rotating body is assumed to be parallel to the axial direction, the thin-walled portion has a middle line 75a in the entire axial direction of the locus of the midpoint of the thickness in the axial cross section. , To form a shape that meets the first condition, The first condition is that the middle line is divided into five regions divided into five equal parts in the axial direction, and the five regions are defined as the center region, the middle region, and the end region from the center to the end, and the intermediate line in each region is a rotating body. A clamp sleeve, characterized in that an average trajectory averaged in the radial direction is formed, and the distance between the average trajectory of each region and the pick-up clamp surface of the rotating body is increased in the order of the center region, the middle region, and the end region. The thin film portion of claim 1, wherein the thin portion is formed such that the intermediate line in the entire axial direction forms a shape that satisfies the second condition. The second condition is that the amount of change in the radial direction of the rotating body of the intermediate line of the five regions is increased in the order of the center region, the intermediate region, and the end region. 3. The clamp sleeve according to claim 2, wherein a bottom surface or a clamp surface of the annular groove is provided so that the midline of the entire axial direction of the thin thickness portion has an overall continuous curved shape. The clamp sleeve according to any one of claims 1 to 3, wherein the bottom face of the annular groove is provided so as to be closer to the picked-up clamp surface of the rotating body as it goes toward both ends from both ends of the thin thickness portion. . The clamp sleeve according to claim 4, wherein the clamp surface is provided so as to be closer to the picked clamp surface of the rotating body as it goes toward both centers from both ends of the thin thickness portion. The clamp sleeve according to any one of claims 1 to 4, wherein a plurality of slits (75d) are provided in the thin thickness portion at intervals in the circumferential direction. The clamp sleeve 7 is accommodated in the annular space 21d between the rotating body 3 and the frame 2, and a deformation force generating means 8 for applying a force to the clamp sleeve. , The cylindrical portion 71 disposed in the annular space, the clamp surface 74 provided on the circumferential portion of the inner or outer circumferential portion of the cylindrical portion facing the rotating body, and the circumferential portion of the cylindrical portion on which the clamp surface is installed. An annular groove 73 which is continuously provided along the circumferential direction on the opposite side to the wall, a thin thickness portion 75 that is determined by the clamp surface and the bottom of the annular groove, and a frame provided at one end of the cylindrical portion. In the clamping device of the ejecting device having a fixing portion 72 to The clamp sleeve is provided with a deformation force acting portion 76 that receives a force in the pulling direction applied in the axial direction at the other end of the cylindrical portion. In the case where the picked-up clamp surface 3e of the rotating body is assumed to be parallel to the axial direction, the thin thickness portion is the middle line 75a of the entire axial direction of the locus of the midpoint of the thickness in the axial cross section. It is formed to form a shape that meets the first condition, The first condition is that the middle line is divided into five regions divided into five equal parts in the axial direction, and the five regions are defined as the center region, the middle region, and the end region from the center to the end, and the intermediate line in each region is a rotating body. The average trajectory formed in the radial direction was formed, and the distance between the average trajectory of each region and the pick-up clamp surface of the rotor was increased in the order of the center region, the middle region, and the end region. In the state where the clamp sleeve is accommodated in the annular space, when a predetermined amount of force in the pulling direction is applied to the deformation force acting portion with the deformation force generating means therebetween, the clamp surface of the thin-thick portion is the pickled surface of the rotating body. Retreat in a direction away from the rotor to unclamp the rotor, When the force from the deformation force generating means is released, the clamping surface of the thin-thick portion moves toward the pressing side of the clamping surface of the rotating body by the restoring force, and the rotating body is clamped. Clamp device. It consists of a clamp sleeve (7) accommodated in the annular space (21d) between the rotating body 3 and the frame (2), and the deformation force generating means (8) for applying a force to the clamp sleeve, The clamp sleeve includes a cylindrical portion 71 disposed in the annular space, a clamp surface 74 provided on a circumferential portion of the inner or outer circumferential portion of the cylindrical portion facing the rotating body, and a cylinder on which the clamp surface is provided. In the annular groove 73 which is continuously provided along the circumferential direction on the circumferential side opposite to the circumferential portion, the thin thickness portion 75 which is determined as the bottom face of the clamp surface and the annular groove, and at one end of the cylindrical portion In the clamping device of the ejecting device having a fixing portion 72 to the frame to be installed, As for the clamp sleeve, the other end part of a cylindrical part is provided with the deformation force acting part 76 which receives the force of the compression direction applied to an axial direction, In the case where the picked-up clamp surface 3e of the rotating body is assumed to be parallel to the axial direction, the thin-walled portion has a middle line 75a in the entire axial direction of the locus of the midpoint of the thickness in the axial cross section. , To form a shape that meets the first condition, The first condition is that the middle line is divided into five regions divided into five equal parts in the axial direction, and the five regions are defined as the center region, the middle region, and the end region from the center to the end, and the intermediate line in each region is a rotating body. The average trajectory formed in the radial direction was formed, and the distance between the average trajectory of each region and the pick-up clamp surface of the rotor was increased in the order of the center region, the middle region, and the end region. In the state where the clamp sleeve is accommodated in the annular space, when a predetermined amount of force in the compression direction is applied to the deformation force acting portion with the deformation force generating means therebetween, the clamp surface of the thin thickness portion is formed on the pickled surface of the rotating body. Proceed in the direction to get closer to put the rotor in a clamp state, When the force from the deformation force generating means is released, the clamp surface of the thin-thick portion retreats in a direction away from the clamping surface of the rotating body by the restoring force, and the rotating body is unclamped. Clamp device of the exit device.

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