US20050097985A1 - Clamping device and rotary table apparatus - Google Patents
Clamping device and rotary table apparatus Download PDFInfo
- Publication number
- US20050097985A1 US20050097985A1 US10/956,334 US95633404A US2005097985A1 US 20050097985 A1 US20050097985 A1 US 20050097985A1 US 95633404 A US95633404 A US 95633404A US 2005097985 A1 US2005097985 A1 US 2005097985A1
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- US
- United States
- Prior art keywords
- driven shaft
- thin
- clamping device
- walled sleeve
- rotary table
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
- F16D49/14—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as a fluid-filled flexible member actuated by variation of the fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/25—Movable or adjustable work or tool supports
- B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
- B23Q1/28—Means for securing sliding members in any desired position
- B23Q1/287—Means for securing sliding members in any desired position using a hydraulically controlled membrane acting directly upon a sliding member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/121—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
- B23Q16/02—Indexing equipment
- B23Q16/022—Indexing equipment in which only the indexing movement is of importance
- B23Q16/025—Indexing equipment in which only the indexing movement is of importance by converting a continuous movement into a rotary indexing movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
- B23Q5/341—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission cam-operated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/004—Profiled friction surfaces, e.g. grooves, dimples
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/14—Rotary member or shaft indexing, e.g., tool or work turret
- Y10T74/1494—Locking means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19637—Gearing with brake means for gearing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19698—Spiral
- Y10T74/19828—Worm
Definitions
- the present invention relates to clamping devices and rotary table apparatuses.
- Rotary table apparatuses used in machine tools or the like are already well known.
- Such rotary table apparatuses include a driven shaft that is rotationally driven by a driving section such as a motor, and a rotary table that is rotationally driven by this driven shaft and that holds a workpiece or the like.
- a driving section such as a motor
- a rotary table that is rotationally driven by this driven shaft and that holds a workpiece or the like.
- Such a rotary table apparatus further includes a clamping device for clamping the driven shaft, in order to realize such a function as to securely keep the rotary table still.
- this clamping device clamps the driven shaft to, for example, perform work on the workpiece that is held by the rotary table.
- the rotary table can be reliably held still, and work can be performed on the workpiece with high precision.
- the driven shaft is supported rotatably with respect to the housing by bearings or the like.
- misalignments may occur in the driven shaft.
- examples of such misalignments are axial displacements in which the axis of the driven shaft is displaced from the desired axis, and angular inclinations in which the axial orientation of the driven shaft is inclined from the desired axial orientation.
- Such a discrepancy in the relative positions may also occur when there are misalignments due to displacement or inclination of the clamping device, even when there is no misalignment of the driven shaft.
- the present invention has been made in view of the above issues, and it is an object of the present invention to provide a clamping device and a rotary table apparatus, with which a rotatably supported shaft can be properly clamped, even when there is a misalignment of the shaft or the clamping device.
- a clamping device for clamping a rotatably supported shaft comprises: a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of the shaft; wherein the clamping device clamps the shaft by deforming the thin-walled sleeve towards the shaft.
- FIG. 1 shows a longitudinal section through a rotary table apparatus 10 according to an embodiment of the present invention
- FIG. 2 shows a section along A-A in FIG. 1 ;
- FIG. 3 is a magnified view of the clamping device 52 ;
- FIGS. 4A and 4B are diagrams illustrating the operation of the clamping device 52 ;
- FIGS. 5A and 5B are sectional views showing a state of the driven shaft 44 and the clamping device 52 when the driven shaft 44 is off center;
- FIGS. 6A and 6B are sectional views showing a state of the driven shaft 44 and the clamping device 52 when the driven shaft 44 is inclined;
- FIG. 7 is a diagram showing a rotary table apparatus 63 according to a first modification example
- FIGS. 8A and 8B are diagrams showing a rotary table apparatus 72 according to a second modification example
- FIG. 9 is a diagram showing a rotary table apparatus 82 according to a third modification example.
- FIG. 10 is a top view of a moving member
- FIG. 11 is a front view of the moving member
- FIG. 12 is a diagram showing a portion of a rotary table apparatus including a driven shaft having grooves and a clamping device for clamping this driven shaft;
- FIG. 13 is a diagram showing variations of groove shapes
- FIG. 14 is a diagram showing a portion of a rotary table apparatus including a driven shaft having grooves and a clamping device for clamping this driven shaft.
- a clamping device for clamping a rotatably supported shaft comprises: a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of the shaft; wherein the clamping device clamps the shaft by deforming the thin-walled sleeve towards the shaft.
- a rotatably supported shaft can be properly clamped even when there is a misalignment of the shaft or the clamping device.
- a thickness of the thin-walled sleeve may be 5 mm or less.
- the rotatably supported shaft can be clamped more properly, even when there is a misalignment of the shaft or the clamping device.
- the clamping device may clamp the shaft by deforming the thin-walled sleeve such that the thin-walled sleeve adapts to the shape of a circumferential surface of the shaft.
- the rotatably supported shaft can be clamped more properly even when there is a misalignment of the shaft or the shaft or the clamping device, because when the thin-walled sleeve is deformed, it adapts to the shape of the circumferential surface of the shaft.
- the thin-walled sleeve may be positioned on an outer side in a radial direction of the shaft; and the clamping device may clamp the shaft by deforming the thin-walled sleeve from the outer side in the radial direction towards the shaft.
- the clamping device may further comprise a fluid containing section for containing a fluid, the fluid containing section being arranged on the outer side in the radial direction with respect to the thin-walled sleeve; wherein the clamping device may deform the thin-walled sleeve by a pressure of the fluid that is filled into the fluid containing section.
- the thin-walled sleeve can be deformed according to a simple method.
- the thin-walled sleeve may be arranged only on an inner side in the radial direction of the shaft with respect to the fluid containing section.
- the thin-walled sleeve is provided both on the inner side and on the outer side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure of the fluid in the fluid containing section, that is, the effect of the pressure deforming the thin-walled sleeve will be distributed between the thin-walled sleeve arranged radially inward and the thin-walled sleeve arranged radially outward.
- the thin-walled sleeve is provided only on the inner side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure is concentrated on that thin-walled sleeve, and thus, the thin-walled sleeve can be efficiently deformed.
- a rotary table apparatus comprising: a driven shaft that is rotationally driven by a driving section; a rotary table that is rotationally driven by the driven shaft; and a clamping device for clamping the driven shaft; wherein the clamping device includes a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of the driven shaft; and wherein the clamping device clamps the driven shaft by deforming the thin-walled sleeve towards the driven shaft.
- the driven shaft can be properly clamped even when there is a misalignment of the driven shaft or the clamping device.
- a thickness of the thin-walled sleeve may be 5 mm or less.
- the driven shaft can be clamped more properly, even when there is a misalignment of the driven shaft or the clamping device.
- the driven shaft may have a cam; the rotary table may have a cam follower; and the rotary table may be rotationally driven by the driven shaft using the cam and the cam follower.
- the driven shaft which rotationally drives the rotary table using a cam and a cam follower, can be clamped more properly, even when there is a misalignment of the driven shaft or the clamping device.
- the rotary table apparatus does not have to be provided with a dwelling period in which the rotary table is not rotationally driven even though the driven shaft is being rotationally driven.
- the driven shaft will always be standing still when the rotary table is positioned and standing still. Therefore, the importance of the clamping device for securely holding the rotary table still by clamping the driven shaft increases. Consequently, the above-noted effect, that is, the effect that it is possible to properly clamp the driven shaft even when there is a misalignment of the driven shaft or the clamping device, can be achieved more appropriately.
- the clamping device may clamp the driven shaft by deforming the thin-walled sleeve such that the thin-walled sleeve adapts to the shape of a circumferential surface of the driven shaft.
- the thin-walled sleeve may be positioned on an outer side in a radial direction of the driven shaft; and the clamping device may clamp the driven shaft by deforming the thin-walled sleeve from the outer side in the radial direction towards the driven shaft.
- the clamping device may further comprise a fluid containing section for containing a fluid, the fluid containing section being arranged on the outer side in the radial direction with respect to the thin-walled sleeve; and the clamping device may deform the thin-walled sleeve by a pressure of the fluid that is filled into the fluid containing section.
- the thin-walled sleeve can be deformed according to a simple method.
- the thin-walled sleeve may be arranged only on an inner side in the radial direction of the driven shaft with respect to the fluid containing section.
- the thin-walled sleeve is provided both on the inner side and on the outer side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure of the fluid in the fluid containing section, that is, the effect of the pressure deforming the thin-walled sleeve will be distributed between the thin-walled sleeve arranged radially inward and the thin-walled sleeve arranged radially outward.
- the thin-walled sleeve is provided only on the inner side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure is concentrated on that thin-walled sleeve, and thus, the thin-walled sleeve can be efficiently deformed.
- the gap may include an oil; and a surface of the driven shaft may be provided with a groove into which the oil flows when the clamping device clamps the driven shaft by deforming the thin-walled sleeve towards the driven shaft.
- the oil in the gap flows into the grooves when the thin-walled sleeve clamps the driven shaft, and slippage between the driven shaft and the thin-walled sleeve is prevented, thus solving the above-noted problem.
- FIG. 1 shows a longitudinal section through a rotary table apparatus 10 according to an embodiment of the present invention.
- FIG. 2 shows a section along A-A in FIG. 1 . It should be noted that in FIG. 2 , the vertical direction is indicated by arrows, and a rotary table 12 is arranged above cam followers 8 , for example.
- the rotary table apparatus 10 is provided with a motor 24 , which is an example of a driving section, a driven shaft 44 that is rotationally driven by the motor 24 , a rotary table 12 that is rotationally driven by the driven shaft 44 , a support base 14 that rotatably supports the rotary table 12 , and a clamping device 52 for clamping the driven shaft 44 .
- a motor 24 which is an example of a driving section
- a driven shaft 44 that is rotationally driven by the motor 24
- a rotary table 12 that is rotationally driven by the driven shaft 44
- a support base 14 that rotatably supports the rotary table 12
- a clamping device 52 for clamping the driven shaft 44 .
- the driven shaft 44 is supported by a pair of ball bearings 46 , such that it is freely rotatable with respect to a housing 2 .
- the motor 24 is fastened via a fastening member 26 to one end in the axial direction of the driven shaft 44 .
- the driven shaft 44 is rotationally driven by the driving force of the motor 24 .
- the driven shaft 44 is provided with a roller gear cam 48 , which is an example of a cam.
- the roller gear cam 48 has a cam surface 48 a whose phase is displaced in the axial direction as the driven shaft 44 rotates.
- a globoidal cam in which backlash occurs neither during standstill nor during indexing is used as the roller gear cam 48 .
- the rotary table 12 has the role of holding the workpiece.
- This rotary table 12 is held by a pair of cross roller bearings 30 such that it is freely rotatable with respect to the support base 14 .
- a cylindrical turret 9 is suspended from the lower-surface side of the rotary table 12 , and a plurality of cam followers 8 that are arranged equidistantly in the circumferential direction are provided at the bottom of the outer circumferential surface of the turret 9 .
- These cam followers 8 mesh with the above-described cam surface 48 a of the roller gear cam 48 , such that the rotational force of the driven shaft 44 is transmitted via the roller gear cam 48 and the cam followers 8 to the rotary table 12 . That is to say, using the roller gear cam 48 and the cam followers 8 , the rotary table 12 is rotationally driven by the driven shaft 44 .
- the clamping device 52 is for clamping the driven shaft 44 that is supported rotatably.
- the clamping device 52 is screwed with screws 42 to the housing 2 (see FIG. 3 ).
- the configuration of the clamping device 52 is explained in more detail further below.
- the shape of the cam surface 48 a etc. is designed such that no dwelling period occurs, in other words, such that no period occurs in which the driven shaft 44 is rotationally driven but the rotary table 12 is not rotationally driven.
- oil for lubricating the roller gear cam 48 and the cam followers 8 is provided in a gap portion 40 within the housing 2 . Leakage of the oil to the outside of the rotary table apparatus 10 is prevented by a sealing member 50 or the like.
- the driven shaft 44 When the driven shaft 44 is driven by the motor 24 , the driven shaft 44 rotates with respect to the housing 2 .
- the driven shaft 44 rotates, also the roller gear cam 48 rotates, and the cam followers 8 meshing therewith engage the cam surface 48 a one after the other, so that the rotational driving force is transmitted to the rotation table 12 and the rotary table 12 rotates around the rotation axis of the turret 9 .
- the rotary table 12 has been positioned (for example, when working on a workpiece that is held by the rotary table 12 ), the driven shaft 44 is clamped by the clamping device 52 .
- FIG. 3 is a magnified view of the clamping device 52 .
- FIGS. 4A and 4B are diagrams illustrating the operation of the clamping device 52 .
- the clamping device 52 includes, for example, a clamper 54 , a thin-walled sleeve 54 a, a fluid containing section 58 , a fluid filling port 60 , and a casing 62 .
- the clamper 54 clamps the driven shaft 44 by deformation towards the driven shaft 44 .
- the damper 54 is provided with a thin-walled sleeve 54 a (described below), and is screwed with screws 56 to the casing 62 .
- the thin-walled sleeve 54 a is a thin-walled member made of metal having a hollow cylindrical shape, and is not more than 5 mm thick. This thin-walled sleeve 54 a is arranged along the circumferential direction of the driven shaft 44 , such that a gap 57 is provided on the radially outer side of the driven shaft 44 . Moreover, the thin-walled sleeve 54 a is so thin that it can be deformed. That is to say, the thin-walled sleeve 54 a can be deformed from the outer side, in the radial direction, of the driven shaft 44 toward the driven shaft 44 .
- the thin-walled sleeve 54 a adapts to the shape of the circumferential surface of the driven shaft 44 , so that the driven shaft 44 can be clamped securely. It should be noted that the thin-walled sleeve 54 a is provided only on the inner side in the radial direction of the driven shaft 44 with respect to the fluid containing section 58 (explained below), and is not provided on the outer side etc. in the radial direction of the driven shaft 44 with respect to the fluid containing section 58 .
- the fluid containing section 58 is arranged adjacent to the thin-walled sleeve 54 a, on the outer side in the radial direction of the driven shaft 44 with respect to the thin-walled sleeve 54 a.
- This fluid containing section 58 can contain a fluid F, for example, a liquid such as water or oil, or a gas such as air.
- the pressure of the fluid F that is filled into the fluid containing section 58 deforms the thin-walled sleeve 54 a adjacent to the fluid containing section 58 , whereby the driven shaft 44 is clamped.
- the casing 62 has the function to contain the clamper 54 etc.
- This casing 62 is arranged adjacent to the fluid containing section 58 , on the outer side in the radial direction of the driven shaft 44 with respect to the fluid containing section 58 .
- the clamper 54 is screwed to this casing 62 .
- the casing 62 is provided with a fluid filling port 60 for filling the fluid F into the fluid containing section 58 .
- the fluid F is filled from a fluid transmission device (not shown in the drawings) via the fluid filling port 60 into the fluid containing section 58 .
- FIG. 4A is a sectional view showing the state of the driven shaft 44 and the clamping device 52 when the clamping device 52 is not clamping the driven shaft 44 .
- FIG. 4B is a sectional view showing the state of the driven shaft 44 and the clamping device 52 when the clamping device 52 is clamping the driven shaft 44 .
- the clamping device 52 operates as follows, in order to clamp the driven shaft 44 (see FIG. 4B ).
- the fluid F is filled from a fluid transmission device (not shown in the drawings) through the fluid filling port 60 into the fluid containing section 58 .
- the fluid F that has been filled into the fluid containing section 58 exerts a pressure on the thin-walled sleeve 54 adjacent to the fluid containing section 58 , and this pressure of the fluid F deforms the thin-walled sleeve 54 a from the outer side in the radial direction of the driven shaft 44 towards the driven shaft 44 . That is to say, the gap 57 (see FIG.
- the fluid F is discharged from the fluid containing section 58 .
- the pressure exerted on the thin-walled sleeve 54 a is lowered, and the thin-walled sleeve 54 a is deformed and returned from the state shown in FIG. 4B to the state shown in FIG. 4A . That is to say, the gap 57 that was not present in the state shown in FIG. 4B reappears as shown in FIG. 4A , so that the clamping of the driven shaft 44 is released.
- the driven shaft 44 can be rotationally driven by the motor 24 without hindrance, and the rotary table 12 can be appropriately rotated.
- the clamping device 52 includes a thin-walled sleeve 54 a that is provided such that there is a gap 57 along the circumferential direction of the driven shaft 44 , and the driven shaft 44 is clamped by deforming the thin-walled sleeve 54 a towards the driven shaft 44 .
- the driven shaft 44 can still be properly clamped.
- FIGS. 5A and 5B are sectional views showing the state of the driven shaft 44 and the clamping device 52 when the driven shaft 44 is off center.
- FIGS. 6A and 6B are sectional views showing the state of the driven shaft 44 and the clamping device 52 when the driven shaft 44 is inclined.
- FIGS. 5A and 6A show the state of the driven shaft 44 and the clamping device 52 when the driven shaft 44 is not clamped by the clamping device 52
- FIGS. 5B and 6B show the state of the driven shaft 44 and the clamping device 52 when the driven shaft 44 is clamped by the clamping device 52 .
- the driven shaft 44 is supported rotatably with respect to the housing 2 by the pair of ball bearings 46 , but there is a possibility that misalignments may occur in the driven shaft 44 .
- misalignments may occur in the driven shaft 44 .
- an axial displacement may occur in which the axis (marked “X 1 ” in the figure) of the driven shaft 44 is displaced from the desired axis (marked “X 0 ” in the figure).
- FIG. 5A an axial displacement may occur in which the axis (marked “X 1 ” in the figure) of the driven shaft 44 is displaced from the desired axis (marked “X 0 ” in the figure).
- an angular inclination may occur in which the axial orientation (marked “Y 1 ” in the figure) of the driven shaft 44 is inclined from the desired axial orientation (marked “Y 0 ” in the figure).
- ⁇ the axial orientation
- Y 0 the desired axial orientation
- such a discrepancy in the relative positions may also occur when there are misalignments due to displacement or inclination of the clamping device 52 , even when there is no misalignment of the driven shaft 44 .
- the clamping device 52 is provided with a thin-walled sleeve 54 a that is arranged such that there is a gap 57 along the circumferential direction of the driven shaft 44 , and the driven shaft 44 is clamped by deforming this thin-walled sleeve 54 a towards the driven shaft 44 .
- the clamping device 52 clamps the driven shaft 44 by deforming the thin-walled sleeve 54 a, but the thin-walled sleeve 54 a is so thin that its degree of freedom of deformation is very high.
- the thin-walled sleeve 54 a can easily adapt to the shape of the circumferential surface of the driven shaft 44 , and thus, the driven shaft 44 is properly clamped in a state maintaining the misalignment, without suffering an inadequate load from the clamping device 52 . It should be noted that in order to achieve the above-described effect, it is preferable that the thickness of the thin-walled sleeve 54 a is 5 mm or less.
- the rotary table apparatus 10 includes a driven shaft 44 that is rotationally driven by a driving section such as a motor 24 , and a rotary table 12 that is rotationally driven by the driven shaft 44 , and the above-explained clamping device 52 was applied to the driven shaft 44 of the rotary table apparatus 10 in which the rotary table 12 is rotationally driven by the driven shaft 44 using a cam, such as a roller gear cam 48 provided on the driven shaft 44 , and cam followers 8 that are provided on the rotary table 12 . Modification examples of this are explained with reference to FIGS. 7 to 9 .
- the clamping device 52 is screwed with the pair of screws 42 to the housing 2 , whereas in this first modification example, it is screwed to the housing 2 with two pairs of screws 64 and 66 .
- the screws 66 can be easily attached and removed, so that the rotary table apparatus 63 of this first modification example has the advantage that the essential portions of the clamping device 52 can be easily attached to and removed from the housing 2 .
- this rotary table apparatus 63 by clamping the driven shaft 44 with the above-described clamping device 52 , the driven shaft 44 can be properly clamped even when there are misalignments of the driven shaft 44 or the clamping device 52 .
- a second modification example is described with reference to FIGS. 8A and 8B .
- the diameter of the driven shaft 44 of a rotary table apparatus 72 is larger than the diameter of the driven shaft 44 of the rotary table apparatus 10 according to the above-described embodiment.
- the rotary table apparatus 72 according to this second modification example has the advantage that the holding torque with which the clamping device 52 holds the driven shaft 44 can be increased.
- the spatial arrangement is such that the ball bearing 46 for supporting the driven shaft 44 is arranged at a position that is different from the position of the ball bearing 46 of the rotary table apparatus 10 according to the above-described embodiment.
- the driven shaft 44 can be properly clamped even when there are misalignments of the driven shaft 44 or the clamping device 52 .
- the diameter of the driven shaft 44 of a rotary table apparatus 82 is made larger than the diameter of the driven shaft 44 of the rotary table apparatus 10 according to the above-described embodiment.
- the large diameter portion of the driven shaft 44 of the rotary table apparatus 72 according to the second modification example was configured from a single member
- the large diameter portion of the driven shaft 44 of the rotary table apparatus 82 according to the third modification example is made of two members.
- the driven member 44 is made of a shaft section 84 having the same shape as the driven shaft of the rotary table apparatus 63 according to the first modification example, and a brake rotor 88 that is fastened by a fastening member 86 to the shaft section 84 in order to increase the diameter of the driven shaft 44 . Also with this rotary table apparatus 82 , by clamping the driven shaft 44 with the above-described clamping device 52 , the driven shaft 44 can be properly clamped even when there are misalignments of the driven shaft 44 or the clamping device 52 .
- FIG. 10 is a top view of such a moving member.
- FIG. 11 is a front view of the moving member.
- This moving member 103 includes a motor 133 , and a driven shaft 144 that is supported rotatively by ball bearings 141 and rotationally driven by the motor 133 . Moreover, the driven shaft 144 is provided with a cylindrical cam 121 . On the other hand, a base 101 includes a plurality of cam followers 111 , which mesh with this cylindrical cam 121 .
- the driven shaft 144 when the driven shaft 144 is driven by the motor 133 , the driven shaft 144 rotates (the rotation direction is marked by the letter A in FIG. 11 ).
- the driven shaft 144 rotates, also the cylindrical cam 121 rotates, and the cam followers 111 are engaged by the cylindrical cam 121 one after the other.
- the base 101 is fixed, but the moving member 103 is configured to be movable, so that the moving member 103 moves linearly on the base 101 , guided by guide members 105 , while the cam followers 111 engage the cylindrical cam 121 one after the other (the moving direction is marked by the letter B in FIG. 11 ).
- the moving member 103 is provided with the above-described clamping device 52 , and when the moving member 103 is halted, the driven shaft 144 is clamped by the clamping device 52 .
- the driven shaft 144 can be properly clamped even when there are misalignments of the driven shaft 144 or the clamping device 52 .
- the above-described clamping device 52 is applied to a driven shaft that is rotationally driven by a driving section such as a motor, but there is no limitation to this, and it is possible to apply the clamping device 52 to any shaft that is supported rotatably. For example, it is possible to apply the clamping device 52 to the rotation shaft of the rotary table 12 of the rotary table apparatus 10 .
- the thin-walled sleeve 54 a is positioned on the outer side in the radial direction of the driven shaft 44 , and the driven shaft 44 is clamped by deforming the thin-walled sleeve 54 a from the outer side in the radial direction toward the driven shaft 44 , but there is no limitation to this.
- the driven shaft may have a hollow shape
- the thin-walled sleeve may be positioned on the inner side in the radial direction of this driven shaft
- the driven shaft may be clamped by deforming the thin-walled sleeve from the radially inward side towards the driven shaft.
- the fluid containing section 58 for containing a fluid is arranged on the outer side in the radial direction with respect to the thin-walled sleeve 54 a, and the thin-walled sleeve 54 a is deformed by the pressure of the fluid F filled into the fluid containing section 58 , but there is no limitation to this.
- the thin-walled sleeve may be configured with a piezo-electric element, and the thin-walled sleeve may be deformed by applying a voltage to this piezo-electric element.
- the foregoing embodiment is more preferable in terms that the thin-walled sleeve can be deformed by a simple method.
- the thin-walled sleeve 54 a is provided only on the inner side in the radial direction of the driven shaft 44 with respect to the fluid containing section 58 , but there is no limitation to this.
- a thin-walled sleeve is provided both on the inner side and the outer side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure of the fluid in the fluid containing section, that is, the effect of the pressure deforming the thin-walled sleeve, will be distributed between the thin-walled sleeve arranged on the radially inward side and the thin-walled sleeve arranged on the radially outward side.
- the thin-walled sleeve 54 a is provided only on the inner side in the radial direction of the driven shaft 44 with respect to the fluid containing section 58 , then the effect of the pressure is concentrated on the thin-walled sleeve 54 a, so that the thin-walled sleeve 54 a can be efficiently deformed.
- the foregoing embodiment is more preferable.
- the above-described embodiment is more preferable in terms that the above-noted effect, that is, the effect that it is possible to properly clamp the driven shaft 44 even when there is a misalignment of the driven shaft 44 or the clamping device 52 , can be achieved more appropriately.
- FIGS. 12 and 14 are diagrams showing a portion of a rotary table apparatus including a driven shaft having grooves, and a clamping device for clamping the driven shaft.
- FIG. 12 corresponds to FIG. 3
- FIG. 14 corresponds to FIG. 9 .
- FIG. 13 is a diagram showing variations of groove shapes.
- the rotary table apparatus 10 shown in FIG. 12 is different from the rotary table apparatus 10 shown in FIG. 3 in terms that the gap 57 between the thin-walled sleeve 54 a and the driven shaft 44 is filled with an oil, and that grooves 90 are provided in the surface of the driven shaft 44 , but otherwise, it has the same configuration as the rotary table apparatus 10 shown in FIG. 3 .
- the driven shaft 44 has a plurality of grooves 90 , and each of the grooves 90 runs in the circumferential direction around the driven shaft 44 .
- the driven shaft 44 is clamped by deforming the thin-walled sleeve 54 a through the pressure of the fluid F that is filled into the fluid containing section 58 , as explained above.
- the gap 57 that was located between the thin-walled sleeve 54 a and the driven shaft 44 disappears, and the oil in the gap 57 flows into the grooves 90 that are provided in the surface of the driven shaft 44 .
- grooves 90 are provided in the surface of the driven shaft 44 .
- the oil in the gap 57 flows into the grooves 90 when the thin-walled sleeve 54 a clamps the driven shaft 44 , and slippage between the driven shaft 44 and the thin-walled sleeve 54 a is prevented, thus solving the above-noted problem.
- the interval in the axial direction of the driven shaft 44 between neighboring grooves 90 , of among the plurality of grooves 90 , is most preferably at least 3 mm and at most 10 mm, in terms of ensuring a sufficient groove volume for properly allowing the oil in the gap 57 to flow in, and in terms of ensuring a sufficient area in the surface of the driven shaft 44 where no grooves 90 are provided, such that the clamping capability of the clamping device is not impaired.
- the shape of the grooves 90 there is no limitation to the shape shown in FIG. 12 , and for example, also the shapes shown in FIG. 13 are possible. Also, if the grooves 90 are provided in the driven shaft 44 according to the third modification example, then the grooves 90 are provided in the brake rotor 88 , which constitutes the driven shaft 44 together with the shaft section 84 (see FIG. 14 ). Thus, it is possible to achieve the same effect also with the third modification example.
Abstract
A clamping device for clamping a rotatably supported shaft, is provided with a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of the shaft. The clamping device clamps the shaft by deforming the thin-walled sleeve towards the shaft.
Description
- The present application claims priority upon Japanese Patent Application No. 2003-357306 filed Oct. 17, 2003, which is herein incorporated by reference.
- 1. Field of the Invention
- The present invention relates to clamping devices and rotary table apparatuses.
- 2. Description of the Related Art
- Rotary table apparatuses used in machine tools or the like are already well known. Such rotary table apparatuses include a driven shaft that is rotationally driven by a driving section such as a motor, and a rotary table that is rotationally driven by this driven shaft and that holds a workpiece or the like. When the driven shaft is driven by the driving section, the driven shaft rotates, the rotational driving force of the driven shaft is transmitted to the rotary table, and the rotary table rotates around its rotation axis.
- Such a rotary table apparatus further includes a clamping device for clamping the driven shaft, in order to realize such a function as to securely keep the rotary table still. When the driven shaft has been halted and the rotary table has been positioned, this clamping device clamps the driven shaft to, for example, perform work on the workpiece that is held by the rotary table. Thus, the rotary table can be reliably held still, and work can be performed on the workpiece with high precision. (See, for example, JP 2002-126958A).
- The driven shaft is supported rotatably with respect to the housing by bearings or the like. There is, however, a possibility that misalignments may occur in the driven shaft. Examples of such misalignments are axial displacements in which the axis of the driven shaft is displaced from the desired axis, and angular inclinations in which the axial orientation of the driven shaft is inclined from the desired axial orientation. In these cases, there is a discrepancy between the relative positions of the driven shaft and the clamping device. Such a discrepancy in the relative positions may also occur when there are misalignments due to displacement or inclination of the clamping device, even when there is no misalignment of the driven shaft.
- Consequently, there is a need for a clamping device that can properly clamp the driven shaft even in such a situation.
- The present invention has been made in view of the above issues, and it is an object of the present invention to provide a clamping device and a rotary table apparatus, with which a rotatably supported shaft can be properly clamped, even when there is a misalignment of the shaft or the clamping device.
- According to a main aspect of the present invention, a clamping device for clamping a rotatably supported shaft, comprises: a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of the shaft; wherein the clamping device clamps the shaft by deforming the thin-walled sleeve towards the shaft.
- Features and objects of the present invention other than the above will become clear by reading the description of the present specification with reference to the accompanying drawings.
- In order to facilitate further understanding of the present invention and the advantages thereof, reference is now made to the following description taken in conjunction with the accompanying drawings wherein:
-
FIG. 1 shows a longitudinal section through arotary table apparatus 10 according to an embodiment of the present invention; -
FIG. 2 shows a section along A-A inFIG. 1 ; -
FIG. 3 is a magnified view of theclamping device 52; -
FIGS. 4A and 4B are diagrams illustrating the operation of theclamping device 52; -
FIGS. 5A and 5B are sectional views showing a state of the drivenshaft 44 and theclamping device 52 when the drivenshaft 44 is off center; -
FIGS. 6A and 6B are sectional views showing a state of the drivenshaft 44 and theclamping device 52 when the drivenshaft 44 is inclined; -
FIG. 7 is a diagram showing arotary table apparatus 63 according to a first modification example; -
FIGS. 8A and 8B are diagrams showing arotary table apparatus 72 according to a second modification example; -
FIG. 9 is a diagram showing arotary table apparatus 82 according to a third modification example; -
FIG. 10 is a top view of a moving member; -
FIG. 11 is a front view of the moving member; -
FIG. 12 is a diagram showing a portion of a rotary table apparatus including a driven shaft having grooves and a clamping device for clamping this driven shaft; -
FIG. 13 is a diagram showing variations of groove shapes; and -
FIG. 14 is a diagram showing a portion of a rotary table apparatus including a driven shaft having grooves and a clamping device for clamping this driven shaft. - At least the following matters will be made clear by the explanation in the present specification and the description of the accompanying drawings.
- A clamping device for clamping a rotatably supported shaft, comprises: a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of the shaft; wherein the clamping device clamps the shaft by deforming the thin-walled sleeve towards the shaft.
- With such a clamping device, a rotatably supported shaft can be properly clamped even when there is a misalignment of the shaft or the clamping device.
- Further, a thickness of the thin-walled sleeve may be 5 mm or less.
- With such a clamping device, the rotatably supported shaft can be clamped more properly, even when there is a misalignment of the shaft or the clamping device.
- Further, the clamping device may clamp the shaft by deforming the thin-walled sleeve such that the thin-walled sleeve adapts to the shape of a circumferential surface of the shaft.
- With such a clamping device, the rotatably supported shaft can be clamped more properly even when there is a misalignment of the shaft or the shaft or the clamping device, because when the thin-walled sleeve is deformed, it adapts to the shape of the circumferential surface of the shaft.
- Further, the thin-walled sleeve may be positioned on an outer side in a radial direction of the shaft; and the clamping device may clamp the shaft by deforming the thin-walled sleeve from the outer side in the radial direction towards the shaft.
- Thus, the configuration becomes simple.
- The clamping device may further comprise a fluid containing section for containing a fluid, the fluid containing section being arranged on the outer side in the radial direction with respect to the thin-walled sleeve; wherein the clamping device may deform the thin-walled sleeve by a pressure of the fluid that is filled into the fluid containing section.
- Thus, the thin-walled sleeve can be deformed according to a simple method.
- Further, the thin-walled sleeve may be arranged only on an inner side in the radial direction of the shaft with respect to the fluid containing section.
- If, for example, the thin-walled sleeve is provided both on the inner side and on the outer side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure of the fluid in the fluid containing section, that is, the effect of the pressure deforming the thin-walled sleeve will be distributed between the thin-walled sleeve arranged radially inward and the thin-walled sleeve arranged radially outward. On the other hand, if the thin-walled sleeve is provided only on the inner side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure is concentrated on that thin-walled sleeve, and thus, the thin-walled sleeve can be efficiently deformed.
- Also provided is a rotary table apparatus comprising: a driven shaft that is rotationally driven by a driving section; a rotary table that is rotationally driven by the driven shaft; and a clamping device for clamping the driven shaft; wherein the clamping device includes a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of the driven shaft; and wherein the clamping device clamps the driven shaft by deforming the thin-walled sleeve towards the driven shaft.
- With such a rotary table apparatus, the driven shaft can be properly clamped even when there is a misalignment of the driven shaft or the clamping device.
- Further, a thickness of the thin-walled sleeve may be 5 mm or less.
- With such a rotary table apparatus, the driven shaft can be clamped more properly, even when there is a misalignment of the driven shaft or the clamping device.
- Further, the driven shaft may have a cam; the rotary table may have a cam follower; and the rotary table may be rotationally driven by the driven shaft using the cam and the cam follower.
- With such a rotary table apparatus, the driven shaft, which rotationally drives the rotary table using a cam and a cam follower, can be clamped more properly, even when there is a misalignment of the driven shaft or the clamping device.
- Further, the rotary table apparatus does not have to be provided with a dwelling period in which the rotary table is not rotationally driven even though the driven shaft is being rotationally driven.
- In this case, the driven shaft will always be standing still when the rotary table is positioned and standing still. Therefore, the importance of the clamping device for securely holding the rotary table still by clamping the driven shaft increases. Consequently, the above-noted effect, that is, the effect that it is possible to properly clamp the driven shaft even when there is a misalignment of the driven shaft or the clamping device, can be achieved more appropriately.
- Further, the clamping device may clamp the driven shaft by deforming the thin-walled sleeve such that the thin-walled sleeve adapts to the shape of a circumferential surface of the driven shaft.
- With such a rotary table apparatus, it is possible to clamp the driven shaft more properly even when there is a misalignment of the driven shaft or the clamping device, because when the thin-walled sleeve is deformed, it adapts to the shape of the circumferential surface of the driven shaft.
- Further, the thin-walled sleeve may be positioned on an outer side in a radial direction of the driven shaft; and the clamping device may clamp the driven shaft by deforming the thin-walled sleeve from the outer side in the radial direction towards the driven shaft.
- Thus, the configuration becomes simple.
- Further, the clamping device may further comprise a fluid containing section for containing a fluid, the fluid containing section being arranged on the outer side in the radial direction with respect to the thin-walled sleeve; and the clamping device may deform the thin-walled sleeve by a pressure of the fluid that is filled into the fluid containing section.
- Thus, the thin-walled sleeve can be deformed according to a simple method.
- Further, the thin-walled sleeve may be arranged only on an inner side in the radial direction of the driven shaft with respect to the fluid containing section.
- If, for example, the thin-walled sleeve is provided both on the inner side and on the outer side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure of the fluid in the fluid containing section, that is, the effect of the pressure deforming the thin-walled sleeve will be distributed between the thin-walled sleeve arranged radially inward and the thin-walled sleeve arranged radially outward. On the other hand, if the thin-walled sleeve is provided only on the inner side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure is concentrated on that thin-walled sleeve, and thus, the thin-walled sleeve can be efficiently deformed.
- Further, the gap may include an oil; and a surface of the driven shaft may be provided with a groove into which the oil flows when the clamping device clamps the driven shaft by deforming the thin-walled sleeve towards the driven shaft.
- When the driven shaft is clamped and a large rotation load is exerted on the driven shaft, there is a possibility that the driven shaft and the thin-walled sleeve may get locked due to the friction heat occurring between the driven shaft and the thin-walled sleeve. The oil achieves the function of preventing the occurrence of such locking in the event that a large rotation load is exerted on the driven shaft. However, in ordinary situations, due to the effect of the oil provided in the gap, the driven shaft and the thin-walled sleeve are prone to slide against each other, and thus, there is the problem that a sufficient clamping capability cannot be attained. By providing grooves in the surface of the driven shaft, the oil in the gap flows into the grooves when the thin-walled sleeve clamps the driven shaft, and slippage between the driven shaft and the thin-walled sleeve is prevented, thus solving the above-noted problem.
- Configuration Example of Rotary Table Apparatus
- The following is an explanation of a configuration example of a
rotary table apparatus 10, with reference toFIGS. 1 and 2 .FIG. 1 shows a longitudinal section through arotary table apparatus 10 according to an embodiment of the present invention.FIG. 2 shows a section along A-A inFIG. 1 . It should be noted that inFIG. 2 , the vertical direction is indicated by arrows, and a rotary table 12 is arranged abovecam followers 8, for example. - The
rotary table apparatus 10 is provided with amotor 24, which is an example of a driving section, a drivenshaft 44 that is rotationally driven by themotor 24, a rotary table 12 that is rotationally driven by the drivenshaft 44, a support base 14 that rotatably supports the rotary table 12, and aclamping device 52 for clamping the drivenshaft 44. - The driven
shaft 44 is supported by a pair ofball bearings 46, such that it is freely rotatable with respect to ahousing 2. Themotor 24 is fastened via afastening member 26 to one end in the axial direction of the drivenshaft 44. The drivenshaft 44 is rotationally driven by the driving force of themotor 24. The drivenshaft 44 is provided with aroller gear cam 48, which is an example of a cam. Theroller gear cam 48 has acam surface 48 a whose phase is displaced in the axial direction as the drivenshaft 44 rotates. Here, a globoidal cam in which backlash occurs neither during standstill nor during indexing is used as theroller gear cam 48. - The rotary table 12 has the role of holding the workpiece. This rotary table 12 is held by a pair of
cross roller bearings 30 such that it is freely rotatable with respect to the support base 14. Acylindrical turret 9 is suspended from the lower-surface side of the rotary table 12, and a plurality ofcam followers 8 that are arranged equidistantly in the circumferential direction are provided at the bottom of the outer circumferential surface of theturret 9. Thesecam followers 8 mesh with the above-describedcam surface 48 a of theroller gear cam 48, such that the rotational force of the drivenshaft 44 is transmitted via theroller gear cam 48 and thecam followers 8 to the rotary table 12. That is to say, using theroller gear cam 48 and thecam followers 8, the rotary table 12 is rotationally driven by the drivenshaft 44. - The clamping
device 52 is for clamping the drivenshaft 44 that is supported rotatably. The clampingdevice 52 is screwed withscrews 42 to the housing 2 (seeFIG. 3 ). The configuration of theclamping device 52 is explained in more detail further below. - It should be noted that in this embodiment, the shape of the
cam surface 48 a etc. is designed such that no dwelling period occurs, in other words, such that no period occurs in which the drivenshaft 44 is rotationally driven but the rotary table 12 is not rotationally driven. Moreover, oil for lubricating theroller gear cam 48 and thecam followers 8 is provided in agap portion 40 within thehousing 2. Leakage of the oil to the outside of therotary table apparatus 10 is prevented by a sealingmember 50 or the like. - The following is an explanation of the operation of the
rotary table apparatus 10 which is structured as above. - When the driven
shaft 44 is driven by themotor 24, the drivenshaft 44 rotates with respect to thehousing 2. When the drivenshaft 44 rotates, also theroller gear cam 48 rotates, and thecam followers 8 meshing therewith engage thecam surface 48 a one after the other, so that the rotational driving force is transmitted to the rotation table 12 and the rotary table 12 rotates around the rotation axis of theturret 9. Moreover, when the rotary table 12 has been positioned (for example, when working on a workpiece that is held by the rotary table 12), the drivenshaft 44 is clamped by the clampingdevice 52. - About the
Clamping Device 52 - The following is an explanation of a configuration example and an operation example of the
clamping device 52, with reference toFIGS. 3, 4A and 4B.FIG. 3 is a magnified view of theclamping device 52.FIGS. 4A and 4B are diagrams illustrating the operation of theclamping device 52. - Configuration Example of Clamping
Device 52 - First, a configuration example of the
clamping device 52 is explained with reference toFIG. 3 . - The clamping
device 52 includes, for example, aclamper 54, a thin-walled sleeve 54 a, afluid containing section 58, afluid filling port 60, and acasing 62. - The
clamper 54 clamps the drivenshaft 44 by deformation towards the drivenshaft 44. Thedamper 54 is provided with a thin-walled sleeve 54 a (described below), and is screwed withscrews 56 to thecasing 62. - The thin-
walled sleeve 54 a is a thin-walled member made of metal having a hollow cylindrical shape, and is not more than 5 mm thick. This thin-walled sleeve 54 a is arranged along the circumferential direction of the drivenshaft 44, such that agap 57 is provided on the radially outer side of the drivenshaft 44. Moreover, the thin-walled sleeve 54 a is so thin that it can be deformed. That is to say, the thin-walled sleeve 54 a can be deformed from the outer side, in the radial direction, of the drivenshaft 44 toward the drivenshaft 44. When deforming, the thin-walled sleeve 54 a adapts to the shape of the circumferential surface of the drivenshaft 44, so that the drivenshaft 44 can be clamped securely. It should be noted that the thin-walled sleeve 54 a is provided only on the inner side in the radial direction of the drivenshaft 44 with respect to the fluid containing section 58 (explained below), and is not provided on the outer side etc. in the radial direction of the drivenshaft 44 with respect to thefluid containing section 58. - The
fluid containing section 58 is arranged adjacent to the thin-walled sleeve 54 a, on the outer side in the radial direction of the drivenshaft 44 with respect to the thin-walled sleeve 54 a. Thisfluid containing section 58 can contain a fluid F, for example, a liquid such as water or oil, or a gas such as air. The pressure of the fluid F that is filled into thefluid containing section 58 deforms the thin-walled sleeve 54 a adjacent to thefluid containing section 58, whereby the drivenshaft 44 is clamped. - The
casing 62 has the function to contain theclamper 54 etc. Thiscasing 62 is arranged adjacent to thefluid containing section 58, on the outer side in the radial direction of the drivenshaft 44 with respect to thefluid containing section 58. As explained above, theclamper 54 is screwed to thiscasing 62. Moreover, thecasing 62 is provided with afluid filling port 60 for filling the fluid F into thefluid containing section 58. The fluid F is filled from a fluid transmission device (not shown in the drawings) via thefluid filling port 60 into thefluid containing section 58. - Operation Example of the
Clamping Device 52 - The following is an explanation of an operation example of the
clamping device 52, with reference toFIGS. 4A and 4B .FIG. 4A is a sectional view showing the state of the drivenshaft 44 and theclamping device 52 when theclamping device 52 is not clamping the drivenshaft 44.FIG. 4B is a sectional view showing the state of the drivenshaft 44 and theclamping device 52 when theclamping device 52 is clamping the drivenshaft 44. - As described above, when the driven
shaft 44 is driven by themotor 24, the drivenshaft 44 rotates with respect to thehousing 2, and the rotational driving force from this rotation is transmitted to the rotary table 12, thereby rotating the rotary table 12 around the rotation axis of theturret 9. In this situation, clamping with the clampingdevice 52 is not performed, so as not to hinder the rotation of the drivenshaft 44. That is to say, when the drivenshaft 44 rotates, the clampingdevice 52 is maintained in the state shown inFIG. 4A . - Then, when the driven
shaft 44 is halted and the rotary table 12 has been positioned, the clampingdevice 52 operates as follows, in order to clamp the driven shaft 44 (seeFIG. 4B ). - First, the fluid F is filled from a fluid transmission device (not shown in the drawings) through the
fluid filling port 60 into thefluid containing section 58. The fluid F that has been filled into thefluid containing section 58 exerts a pressure on the thin-walled sleeve 54 adjacent to thefluid containing section 58, and this pressure of the fluid F deforms the thin-walled sleeve 54 a from the outer side in the radial direction of the drivenshaft 44 towards the drivenshaft 44. That is to say, the gap 57 (seeFIG. 4A ), which is located between the thin-walled sleeve 54 a and the drivenshaft 44 before the fluid F is filled into the containingportion 58, disappears due to the deformation of the thin-walled sleeve 54 a (seeFIG. 4B ), and the thin-walled sleeve 54 a adapts to the shape of the circumferential surface of the drivenshaft 44. Then, the thin-walled sleeve 54 a presses against the drivenshaft 44, thereby clamping the drivenshaft 44. When the drivenshaft 44 is clamped in this manner, the positioned rotary table 12 is reliably held still. Consequently, if the workpiece is worked on in this situation, then it is possible to work on the workpiece with high precision. - Then, when the
rotary table apparatus 10 is to rotate the rotary table 12 again, the clamping of the drivenshaft 44 by the clampingdevice 52 is released through the following operation. - First, the fluid F is discharged from the
fluid containing section 58. By discharging the fluid F, the pressure exerted on the thin-walled sleeve 54 a is lowered, and the thin-walled sleeve 54 a is deformed and returned from the state shown inFIG. 4B to the state shown inFIG. 4A . That is to say, thegap 57 that was not present in the state shown inFIG. 4B reappears as shown inFIG. 4A , so that the clamping of the drivenshaft 44 is released. When the clamping of the drivenshaft 44 is released, the drivenshaft 44 can be rotationally driven by themotor 24 without hindrance, and the rotary table 12 can be appropriately rotated. - About the Effectiveness of the
Clamping Device 52 According to the Present Embodiment With Regard to a Misaligned DrivenShaft 44 - As described above, the clamping
device 52 according to the present embodiment includes a thin-walled sleeve 54 a that is provided such that there is agap 57 along the circumferential direction of the drivenshaft 44, and the drivenshaft 44 is clamped by deforming the thin-walled sleeve 54 a towards the drivenshaft 44. Thus, even when there are misalignments in the drivenshaft 44 and/or theclamping device 52, the drivenshaft 44 can still be properly clamped. - This aspect is explained with reference to
FIGS. 5A to 6B.FIGS. 5A and 5B are sectional views showing the state of the drivenshaft 44 and theclamping device 52 when the drivenshaft 44 is off center.FIGS. 6A and 6B are sectional views showing the state of the drivenshaft 44 and theclamping device 52 when the drivenshaft 44 is inclined.FIGS. 5A and 6A show the state of the drivenshaft 44 and theclamping device 52 when the drivenshaft 44 is not clamped by the clampingdevice 52, whereasFIGS. 5B and 6B show the state of the drivenshaft 44 and theclamping device 52 when the drivenshaft 44 is clamped by the clampingdevice 52. - As explained in the section of the “Description of the Related Art”, the driven
shaft 44 is supported rotatably with respect to thehousing 2 by the pair ofball bearings 46, but there is a possibility that misalignments may occur in the drivenshaft 44. For example, as shown inFIG. 5A , an axial displacement may occur in which the axis (marked “X1” in the figure) of the drivenshaft 44 is displaced from the desired axis (marked “X0” in the figure). Or, as shown inFIG. 6A , an angular inclination (marked “α” in the figure) may occur in which the axial orientation (marked “Y1” in the figure) of the drivenshaft 44 is inclined from the desired axial orientation (marked “Y0” in the figure). In these cases, there is a discrepancy between the relative positions of the drivenshaft 44 and theclamping device 52. Moreover, although not shown in the diagrams, such a discrepancy in the relative positions may also occur when there are misalignments due to displacement or inclination of theclamping device 52, even when there is no misalignment of the drivenshaft 44. In view of the above, there is a need for aclamping device 52 that can properly clamp the drivenshaft 44 even in these situations. - The clamping
device 52 according to the present embodiment is provided with a thin-walled sleeve 54 a that is arranged such that there is agap 57 along the circumferential direction of the drivenshaft 44, and the drivenshaft 44 is clamped by deforming this thin-walled sleeve 54 a towards the drivenshaft 44. In this way, the above-mentioned need is fulfilled. That is to say, the clampingdevice 52 clamps the drivenshaft 44 by deforming the thin-walled sleeve 54 a, but the thin-walled sleeve 54 a is so thin that its degree of freedom of deformation is very high. Consequently, even when there is a misalignment such as axial displacement or angular inclination of the drivenshaft 44 as shown inFIGS. 5B and 6B , or if there is a misalignment such as axial displacement or angular inclination of theclamping device 52, the thin-walled sleeve 54 a can easily adapt to the shape of the circumferential surface of the drivenshaft 44, and thus, the drivenshaft 44 is properly clamped in a state maintaining the misalignment, without suffering an inadequate load from the clampingdevice 52. It should be noted that in order to achieve the above-described effect, it is preferable that the thickness of the thin-walled sleeve 54 a is 5 mm or less. - Other Embodiments
- Above, a clamping device and a rotary table apparatus of the present invention were described with reference to an embodiment thereof, but the foregoing embodiment of the present invention is merely to facilitate the understanding of the present invention, and does not limit the present invention. Needless to say, changes and modifications of the present invention are possible without deviating from the spirit of the invention, and equivalents are intended to be embraced therein.
- In the foregoing embodiment, an example was explained in which the
rotary table apparatus 10 includes a drivenshaft 44 that is rotationally driven by a driving section such as amotor 24, and a rotary table 12 that is rotationally driven by the drivenshaft 44, and the above-explainedclamping device 52 was applied to the drivenshaft 44 of therotary table apparatus 10 in which the rotary table 12 is rotationally driven by the drivenshaft 44 using a cam, such as aroller gear cam 48 provided on the drivenshaft 44, andcam followers 8 that are provided on the rotary table 12. Modification examples of this are explained with reference to FIGS. 7 to 9. - First of all, a first modification example is explained with reference to
FIG. 7 . In the foregoing embodiment, the clampingdevice 52 is screwed with the pair ofscrews 42 to thehousing 2, whereas in this first modification example, it is screwed to thehousing 2 with two pairs ofscrews screws 66 can be easily attached and removed, so that therotary table apparatus 63 of this first modification example has the advantage that the essential portions of theclamping device 52 can be easily attached to and removed from thehousing 2. Also with thisrotary table apparatus 63, by clamping the drivenshaft 44 with the above-describedclamping device 52, the drivenshaft 44 can be properly clamped even when there are misalignments of the drivenshaft 44 or theclamping device 52. - A second modification example is described with reference to
FIGS. 8A and 8B . In this second modification example, the diameter of the drivenshaft 44 of arotary table apparatus 72 is larger than the diameter of the drivenshaft 44 of therotary table apparatus 10 according to the above-described embodiment. Thus, therotary table apparatus 72 according to this second modification example has the advantage that the holding torque with which theclamping device 52 holds the drivenshaft 44 can be increased. Moreover, because the diameter of the drivenshaft 44 has been increased, the spatial arrangement is such that theball bearing 46 for supporting the drivenshaft 44 is arranged at a position that is different from the position of theball bearing 46 of therotary table apparatus 10 according to the above-described embodiment. Also with thisrotary table apparatus 72, by clamping the drivenshaft 44 with the above-describedclamping device 52, the drivenshaft 44 can be properly clamped even when there are misalignments of the drivenshaft 44 or theclamping device 52. - Next, a third modification example is explained with reference to
FIG. 9 . In this third modification example, like in the second modification example, in order to increase the holding torque with which theclamping device 52 holds the drivenshaft 44, the diameter of the drivenshaft 44 of arotary table apparatus 82 is made larger than the diameter of the drivenshaft 44 of therotary table apparatus 10 according to the above-described embodiment. However, whereas the large diameter portion of the drivenshaft 44 of therotary table apparatus 72 according to the second modification example was configured from a single member, the large diameter portion of the drivenshaft 44 of therotary table apparatus 82 according to the third modification example is made of two members. That is to say, the drivenmember 44 is made of ashaft section 84 having the same shape as the driven shaft of therotary table apparatus 63 according to the first modification example, and abrake rotor 88 that is fastened by afastening member 86 to theshaft section 84 in order to increase the diameter of the drivenshaft 44. Also with thisrotary table apparatus 82, by clamping the drivenshaft 44 with the above-describedclamping device 52, the drivenshaft 44 can be properly clamped even when there are misalignments of the drivenshaft 44 or theclamping device 52. - Moreover, in the foregoing embodiment, an example was explained in which the above-described
clamping device 52 is applied to the drivenshaft 44 of therotary table apparatus 10, whose rotary table 12 is rotationally driven by the drivenshaft 44 using a cam, such as theroller gear cam 48 provided on the drivenshaft 44, and thecam followers 8 provided on the rotary table 12, but there is no limitation to this. For example, it is also possible to apply the above-describedclamping device 52 to the drivenshaft 44 of arotary table apparatus 10 in which a worm wheel is attached to the rotary table 12, a worm gear meshes with this worm wheel, and the rotary table 12 is rotationally driven by the rotation of that worm gear. - Furthermore, in the foregoing embodiment, an example was explained in which the above-described
clamping device 52 was applied to the drivenshaft 44 of therotary table apparatus 10 having a drivenshaft 44 that is rotationally driven by a driving section such as themotor 24, and a rotary table 12 that is rotationally driven by the drivenshaft 44. There is, however, no limitation to applying theclamping device 52 to the drivenshaft 44 of therotary table apparatus 10. For example, it is also possible to apply the above-described clamping device to the driven shaft of a moving member that is driven by the driven shaft, which is rotationally driven by a driving section such as a motor, and that moves on a base. - Such an example is explained with reference to
FIGS. 10 and 11 .FIG. 10 is a top view of such a moving member.FIG. 11 is a front view of the moving member. - This moving
member 103 includes amotor 133, and a drivenshaft 144 that is supported rotatively byball bearings 141 and rotationally driven by themotor 133. Moreover, the drivenshaft 144 is provided with acylindrical cam 121. On the other hand, abase 101 includes a plurality ofcam followers 111, which mesh with thiscylindrical cam 121. - Here, when the driven
shaft 144 is driven by themotor 133, the drivenshaft 144 rotates (the rotation direction is marked by the letter A inFIG. 11 ). When the drivenshaft 144 rotates, also thecylindrical cam 121 rotates, and thecam followers 111 are engaged by thecylindrical cam 121 one after the other. Thebase 101 is fixed, but the movingmember 103 is configured to be movable, so that the movingmember 103 moves linearly on thebase 101, guided byguide members 105, while thecam followers 111 engage thecylindrical cam 121 one after the other (the moving direction is marked by the letter B inFIG. 11 ). - Furthermore, the moving
member 103 is provided with the above-describedclamping device 52, and when the movingmember 103 is halted, the drivenshaft 144 is clamped by the clampingdevice 52. - Also with this moving
member 103, by clamping the drivenshaft 144 with the above-describedclamping device 52, the drivenshaft 144 can be properly clamped even when there are misalignments of the drivenshaft 144 or theclamping device 52. - Moreover, in all of the foregoing examples, the above-described
clamping device 52 is applied to a driven shaft that is rotationally driven by a driving section such as a motor, but there is no limitation to this, and it is possible to apply theclamping device 52 to any shaft that is supported rotatably. For example, it is possible to apply theclamping device 52 to the rotation shaft of the rotary table 12 of therotary table apparatus 10. - Furthermore, in the foregoing embodiment, the thin-
walled sleeve 54 a is positioned on the outer side in the radial direction of the drivenshaft 44, and the drivenshaft 44 is clamped by deforming the thin-walled sleeve 54 a from the outer side in the radial direction toward the drivenshaft 44, but there is no limitation to this. For example, the driven shaft may have a hollow shape, the thin-walled sleeve may be positioned on the inner side in the radial direction of this driven shaft, and the driven shaft may be clamped by deforming the thin-walled sleeve from the radially inward side towards the driven shaft. - However, the foregoing embodiment is more preferable in terms of making the configuration simple.
- Moreover, the above-described embodiment, the
fluid containing section 58 for containing a fluid is arranged on the outer side in the radial direction with respect to the thin-walled sleeve 54 a, and the thin-walled sleeve 54 a is deformed by the pressure of the fluid F filled into thefluid containing section 58, but there is no limitation to this. For example, the thin-walled sleeve may be configured with a piezo-electric element, and the thin-walled sleeve may be deformed by applying a voltage to this piezo-electric element. - However, the foregoing embodiment is more preferable in terms that the thin-walled sleeve can be deformed by a simple method.
- In the foregoing embodiment, the thin-
walled sleeve 54 a is provided only on the inner side in the radial direction of the drivenshaft 44 with respect to thefluid containing section 58, but there is no limitation to this. For example, it is also possible to arrange the thin-walled sleeve not only on the inner side in the radial direction of the drivenshaft 44 with respect to the fluid containing section, but also on the outer side in the radial direction. - If a thin-walled sleeve is provided both on the inner side and the outer side in the radial direction of the driven shaft with respect to the fluid containing section, then the effect of the pressure of the fluid in the fluid containing section, that is, the effect of the pressure deforming the thin-walled sleeve, will be distributed between the thin-walled sleeve arranged on the radially inward side and the thin-walled sleeve arranged on the radially outward side. On the other hand, if the thin-
walled sleeve 54 a is provided only on the inner side in the radial direction of the drivenshaft 44 with respect to thefluid containing section 58, then the effect of the pressure is concentrated on the thin-walled sleeve 54 a, so that the thin-walled sleeve 54 a can be efficiently deformed. In this respect, the foregoing embodiment is more preferable. - In the
rotary table apparatus 10 according to the foregoing embodiment, there is no dwelling period in which the rotary table 12 is not rotationally driven even though the drivenshaft 44 is being rotationally driven, but there is no limitation to this, and it is also possible to provide such a dwelling period. - If the
rotary table apparatus 10 does not have such a dwelling period, then the drivenshaft 44 will always be standing still when the rotary table 12 is positioned and standing still; therefore, the importance of theclamping device 52 for securely holding the rotary table 12 still by clamping the drivenshaft 44 increases. Consequently, the above-described embodiment is more preferable in terms that the above-noted effect, that is, the effect that it is possible to properly clamp the drivenshaft 44 even when there is a misalignment of the drivenshaft 44 or theclamping device 52, can be achieved more appropriately. - It is further possible to introduce an oil into the
gap 57 between the thin-walled sleeve 54 a and the drivenshaft 44, and to provide the surface of the drivenshaft 44 with grooves for letting the oil flow when the drivenshaft 44 is clamped by deforming the thin-walled sleeve 54 a toward the drivenshaft 44. - This aspect is explained in more detail with reference to FIGS. 12 to 14.
FIGS. 12 and 14 are diagrams showing a portion of a rotary table apparatus including a driven shaft having grooves, and a clamping device for clamping the driven shaft.FIG. 12 corresponds toFIG. 3 , andFIG. 14 corresponds toFIG. 9 .FIG. 13 is a diagram showing variations of groove shapes. - First, attention is paid on
FIG. 12 . Therotary table apparatus 10 shown inFIG. 12 is different from therotary table apparatus 10 shown inFIG. 3 in terms that thegap 57 between the thin-walled sleeve 54 a and the drivenshaft 44 is filled with an oil, and thatgrooves 90 are provided in the surface of the drivenshaft 44, but otherwise, it has the same configuration as therotary table apparatus 10 shown inFIG. 3 . In this embodiment, the drivenshaft 44 has a plurality ofgrooves 90, and each of thegrooves 90 runs in the circumferential direction around the drivenshaft 44. - With the
rotary table apparatus 10 configured in this way, the drivenshaft 44 is clamped by deforming the thin-walled sleeve 54 a through the pressure of the fluid F that is filled into thefluid containing section 58, as explained above. When this happens, thegap 57 that was located between the thin-walled sleeve 54 a and the drivenshaft 44 disappears, and the oil in thegap 57 flows into thegrooves 90 that are provided in the surface of the drivenshaft 44. - In the following, the effect that is attained by providing oil in the
gap 57 and arranginggrooves 90 in the surface of the drivenshaft 44 is explained. When the drivenshaft 44 is clamped and a large rotation load is exerted on the drivenshaft 44, there is a possibility that the drivenshaft 44 and the thin-walled sleeve 54 a may get locked due to the friction heat occurring between the drivenshaft 44 and the thin-walled sleeve 54 a. The oil fulfills the function of preventing the occurrence of such locking in the event that a large rotation load is exerted on the drivenshaft 44. However, in ordinary situations, due to the effect of the oil provided in thegap 57, the drivenshaft 44 and the thin-walled sleeve 54 a are prone to slide against each other, and thus, there is the problem that a sufficient clamping capability cannot be attained. - In order to address this problem,
grooves 90 are provided in the surface of the drivenshaft 44. Thus, the oil in thegap 57 flows into thegrooves 90 when the thin-walled sleeve 54 a clamps the drivenshaft 44, and slippage between the drivenshaft 44 and the thin-walled sleeve 54 a is prevented, thus solving the above-noted problem. - It should be noted that the interval in the axial direction of the driven
shaft 44 between neighboringgrooves 90, of among the plurality ofgrooves 90, (inFIG. 12 , this interval is marked by the letter L) is most preferably at least 3 mm and at most 10 mm, in terms of ensuring a sufficient groove volume for properly allowing the oil in thegap 57 to flow in, and in terms of ensuring a sufficient area in the surface of the drivenshaft 44 where nogrooves 90 are provided, such that the clamping capability of the clamping device is not impaired. - Moreover, regarding the shape of the
grooves 90, there is no limitation to the shape shown inFIG. 12 , and for example, also the shapes shown inFIG. 13 are possible. Also, if thegrooves 90 are provided in the drivenshaft 44 according to the third modification example, then thegrooves 90 are provided in thebrake rotor 88, which constitutes the drivenshaft 44 together with the shaft section 84 (seeFIG. 14 ). Thus, it is possible to achieve the same effect also with the third modification example. - Although preferred embodiments of the present invention have been described, it should be understood that various changes, substitutions and alterations can be made therein without departing from spirit and scope of the invention as defined by the appended claims.
Claims (15)
1. A clamping device for clamping a rotatably supported shaft, comprising:
a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of said shaft;
wherein said clamping device clamps said shaft by deforming said thin-walled sleeve towards said shaft.
2. A clamping device according to claim 1 ,
wherein a thickness of said thin-walled sleeve is 5 mm or less.
3. A clamping device according to claim 1 ,
wherein said clamping device clamps said shaft by deforming said thin-walled sleeve such that said thin-walled sleeve adapts to the shape of a circumferential surface of said shaft.
4. A clamping device according to claim 1 ,
wherein said thin-walled sleeve is positioned on an outer side in a radial direction of said shaft; and
wherein said clamping device clamps said shaft by deforming said thin-walled sleeve from said outer side in the radial direction towards said shaft.
5. A clamping device according to claim 4 , further comprising
a fluid containing section for containing a fluid, said fluid containing section being arranged on said outer side in the radial direction with respect to said thin-walled sleeve;
wherein said clamping device deforms said thin-walled sleeve by a pressure of the fluid that is filled into said fluid containing section.
6. A clamping device according to claim 5 ,
wherein said thin-walled sleeve is arranged only on an inner side in the radial direction of said shaft with respect to said fluid containing section.
7. A rotary table apparatus comprising:
a driven shaft that is rotationally driven by a driving section;
a rotary table that is rotationally driven by said driven shaft; and
a clamping device for clamping said driven shaft;
wherein said clamping device includes a thin-walled sleeve arranged such that a gap is provided along a circumferential direction of said driven shaft; and
wherein said clamping device clamps said driven shaft by deforming said thin-walled sleeve towards said driven shaft.
8. A rotary table apparatus according to claim 7 ,
wherein a thickness of said thin-walled sleeve is 5 mm or less.
9. A rotary table apparatus according to claim 7 ,
wherein said driven shaft has a cam;
wherein said rotary table has a cam follower; and
wherein said rotary table is rotationally driven by said driven shaft using said cam and said cam follower.
10. A rotary table apparatus according to claim 9 ,
wherein said rotary table apparatus does not have a dwelling period in which said rotary table is not rotationally driven even though said driven shaft is being rotationally driven.
11. A rotary table apparatus according to claim 7 ,
wherein said clamping device clamps said driven shaft by deforming said thin-walled sleeve such that said thin-walled sleeve adapts to the shape of a circumferential surface of said driven shaft.
12. A rotary table apparatus according to claim 7 ,
wherein said thin-walled sleeve is positioned on an outer side in a radial direction of said driven shaft; and
wherein said clamping device clamps said driven shaft by deforming said thin-walled sleeve from said outer side in the radial direction towards said driven shaft.
13. A rotary table apparatus according to claim 12 ,
wherein said clamping device further comprises a fluid containing section for containing a fluid, said fluid containing section being arranged on said outer side in the radial direction with respect to said thin-walled sleeve; and
wherein said clamping device deforms said thin-walled sleeve by a pressure of the fluid that is filled into said fluid containing section.
14. A rotary table apparatus according to claim 13 ,
wherein said thin-walled sleeve is arranged only on an inner side in the radial direction of said driven shaft with respect to said fluid containing section.
15. A rotary table apparatus according to claim 7 ,
wherein said gap includes an oil; and
wherein a surface of said driven shaft is provided with a groove into which said oil flows when said clamping device clamps said driven shaft by deforming said thin-walled sleeve towards said driven shaft.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/806,644 US7793567B2 (en) | 2003-10-17 | 2007-06-01 | Clamping device and rotary table apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-357306 | 2003-10-17 | ||
JP2003357306A JP4542761B2 (en) | 2003-10-17 | 2003-10-17 | Rotary table device |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/806,644 Division US7793567B2 (en) | 2003-10-17 | 2007-06-01 | Clamping device and rotary table apparatus |
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US20050097985A1 true US20050097985A1 (en) | 2005-05-12 |
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US11/806,644 Active US7793567B2 (en) | 2003-10-17 | 2007-06-01 | Clamping device and rotary table apparatus |
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US11/806,644 Active US7793567B2 (en) | 2003-10-17 | 2007-06-01 | Clamping device and rotary table apparatus |
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US (2) | US20050097985A1 (en) |
EP (1) | EP1524066B1 (en) |
JP (1) | JP4542761B2 (en) |
KR (1) | KR101107935B1 (en) |
CN (2) | CN102172848B (en) |
DE (1) | DE602004004854T2 (en) |
TW (1) | TWI265840B (en) |
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US20050139036A1 (en) * | 2003-10-17 | 2005-06-30 | Sankyo Seisakusho Co. | Inclining and rotating table apparatus |
US7491022B2 (en) * | 2003-10-17 | 2009-02-17 | Sanko Seisakusho Co. | Inclining and rotating table apparatus |
US20070125193A1 (en) * | 2005-12-05 | 2007-06-07 | Delphi Technologies, Inc. | Sprung gear set and method |
US7721616B2 (en) * | 2005-12-05 | 2010-05-25 | Gm Global Technology Operations, Inc. | Sprung gear set and method |
US20100044941A1 (en) * | 2006-09-21 | 2010-02-25 | Airbus France | Fixed support for parts in machine tools |
US20120180584A1 (en) * | 2011-01-13 | 2012-07-19 | Weiss Gmbh Sondermaschinentechnik | Pivotal drive |
CN103016627A (en) * | 2012-12-18 | 2013-04-03 | 大连虹桥科技有限公司 | Worm drive mechanism |
DE102013202044A1 (en) * | 2013-02-07 | 2014-08-07 | Zf Friedrichshafen Ag | Method for protection against transport damage in gearboxes |
US9841097B2 (en) | 2013-02-07 | 2017-12-12 | Zf Friedrichshafen Ag | Method for protecting from damage during transport of transmissions |
US11117236B2 (en) | 2017-08-10 | 2021-09-14 | Weiss Gmbh | Rotary indexing table with power-optimized drive |
CN108468777A (en) * | 2018-04-27 | 2018-08-31 | 邱垂财 | Roller cam mechanism |
CN109333404A (en) * | 2018-11-19 | 2019-02-15 | 安徽东升精密铸钢件有限公司 | A kind of positioning tool applied to pin shaft processing |
Also Published As
Publication number | Publication date |
---|---|
DE602004004854D1 (en) | 2007-04-05 |
TW200529967A (en) | 2005-09-16 |
CN1608795A (en) | 2005-04-27 |
DE602004004854T2 (en) | 2007-10-31 |
TWI265840B (en) | 2006-11-11 |
KR20050037357A (en) | 2005-04-21 |
CN102172848A (en) | 2011-09-07 |
KR101107935B1 (en) | 2012-01-25 |
JP2005118946A (en) | 2005-05-12 |
JP4542761B2 (en) | 2010-09-15 |
EP1524066B1 (en) | 2007-02-21 |
CN102172848B (en) | 2013-06-05 |
US7793567B2 (en) | 2010-09-14 |
US20070234849A1 (en) | 2007-10-11 |
EP1524066A1 (en) | 2005-04-20 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: SANKYO SEISAKUSHO CO., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KATO, HEIZABURO;REEL/FRAME:016158/0346 Effective date: 20041227 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |