US20050097985A1 - Clamping device and rotary table apparatus - Google Patents

Clamping device and rotary table apparatus Download PDF

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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
Application number
US10/956,334
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English (en)
Inventor
Heizaburo Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sankyo Manufacturing Co Ltd
Original Assignee
Sankyo Manufacturing Co Ltd
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Filing date
Publication date
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Assigned to SANKYO SEISAKUSHO CO. reassignment SANKYO SEISAKUSHO CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, HEIZABURO
Publication of US20050097985A1 publication Critical patent/US20050097985A1/en
Priority to US11/806,644 priority Critical patent/US7793567B2/en
Abandoned legal-status Critical Current

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    • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Machine Tool Units (AREA)
  • Machine Tool Positioning Apparatuses (AREA)
  • Clamps And Clips (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US10/956,334 2003-10-17 2004-10-04 Clamping device and rotary table apparatus Abandoned US20050097985A1 (en)

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US11/806,644 US7793567B2 (en) 2003-10-17 2007-06-01 Clamping device and rotary table apparatus

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JP2003357306A JP4542761B2 (ja) 2003-10-17 2003-10-17 回転テーブル装置
JP2003-357306 2003-10-17

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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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EP (1) EP1524066B1 (ja)
JP (1) JP4542761B2 (ja)
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US20070125193A1 (en) * 2005-12-05 2007-06-07 Delphi Technologies, 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 (zh) * 2012-12-18 2013-04-03 大连虹桥科技有限公司 蜗杆传动机构
DE102013202044A1 (de) * 2013-02-07 2014-08-07 Zf Friedrichshafen Ag Verfahren zum Schutz vor Transportschäden bei Getrieben
CN108468777A (zh) * 2018-04-27 2018-08-31 邱垂财 磙子凸轮机构
CN109333404A (zh) * 2018-11-19 2019-02-15 安徽东升精密铸钢件有限公司 一种应用于销轴加工的定位工装
US11117236B2 (en) 2017-08-10 2021-09-14 Weiss Gmbh Rotary indexing table with power-optimized drive

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JP4898174B2 (ja) * 2005-09-12 2012-03-14 株式会社三共製作所 モータの締結機構及びカム装置
CN100457387C (zh) * 2007-02-06 2009-02-04 南通纵横国际股份有限公司 四轴联动机床中回转轴的转台制动装置
JP5117260B2 (ja) * 2008-04-07 2013-01-16 津田駒工業株式会社 工作機械における主軸駆動装置の回転抵抗装置
CN101649884B (zh) * 2008-08-15 2013-11-13 德昌电机(深圳)有限公司 传动结构及具有所述传动结构的马达组件
WO2011045077A1 (de) * 2009-10-16 2011-04-21 Weiss Gmbh Sondermaschinentechnik Rundschalttisch mit direktem antrieb der transportkurve
CN102000987B (zh) * 2010-12-01 2015-10-14 泰达重工机械（青岛）有限公司 数控转台液压夹紧装置
JP5341969B2 (ja) * 2011-10-28 2013-11-13 株式会社日研工作所 ロータリテーブル装置のブレーキ構造
DE202012011018U1 (de) * 2012-04-21 2012-12-03 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg Verstellantrieb
JP6758190B2 (ja) * 2014-03-11 2020-09-23 コレボン アーベー 摩擦接続手段
TWI557345B (zh) * 2014-05-08 2016-11-11 Output shaft rotary disc group and hobbing cam drive
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JP6380190B2 (ja) * 2015-03-27 2018-08-29 ブラザー工業株式会社 工作機械
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JP6608674B2 (ja) * 2015-11-02 2019-11-20 株式会社三共製作所 ローラギヤカム機構
JP6049918B1 (ja) * 2016-01-07 2016-12-21 Dmg森精機株式会社 工具着脱装置および工作機械
JP6598215B2 (ja) 2017-01-05 2019-10-30 テクノダイナミックス株式会社 カム装置、及び、カム装置の製造方法
TWI653120B (zh) * 2017-11-28 2019-03-11 陳國明 轉盤之分度驅動裝置
KR20200111709A (ko) * 2018-01-31 2020-09-29 가부시끼가이샤 산쿄 세이사쿠쇼 윤활장치 및 윤활장치를 구비하는 캠기구
JP7093991B2 (ja) * 2018-02-26 2022-07-01 パスカルエンジニアリング株式会社 回転軸のブレーキ装置及びそのブレーキ装置を備えたインデックステーブル
CN108825685B (zh) * 2018-10-12 2019-02-15 江苏新瑞重工科技有限公司 用于摇篮式转台刹车装置的保压系统及工作方法
CN108953433B (zh) * 2018-11-01 2019-02-05 江苏新瑞重工科技有限公司 摇篮式转台刹车装置防掉落用液压保压单元及其工作方法
CN109676434B (zh) * 2019-02-28 2024-04-02 东莞市宇丰实业有限公司 一种数控双转盘及数控转台
CN111230522A (zh) * 2019-11-29 2020-06-05 李宇飞 可移动五轴联动摇摆头装置
CN112388338A (zh) * 2020-11-16 2021-02-23 珠海格力智能装备有限公司 转台
JP2022178040A (ja) * 2021-05-19 2022-12-02 津田駒工業株式会社 回転テーブル装置
CN113531072B (zh) * 2021-09-15 2021-12-21 天津龙创恒盛实业有限公司 一种滚珠丝杠用液压制动装置、滚珠丝杠副及制动方法

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Cited By (12)

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Publication number Priority date Publication date Assignee Title
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 (zh) * 2012-12-18 2013-04-03 大连虹桥科技有限公司 蜗杆传动机构
DE102013202044A1 (de) * 2013-02-07 2014-08-07 Zf Friedrichshafen Ag Verfahren zum Schutz vor Transportschäden bei Getrieben
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 (zh) * 2018-04-27 2018-08-31 邱垂财 磙子凸轮机构
CN109333404A (zh) * 2018-11-19 2019-02-15 安徽东升精密铸钢件有限公司 一种应用于销轴加工的定位工装

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CN1608795A (zh) 2005-04-27
KR101107935B1 (ko) 2012-01-25
TW200529967A (en) 2005-09-16
CN102172848A (zh) 2011-09-07
JP2005118946A (ja) 2005-05-12
TWI265840B (en) 2006-11-11
KR20050037357A (ko) 2005-04-21
DE602004004854T2 (de) 2007-10-31
EP1524066B1 (en) 2007-02-21
JP4542761B2 (ja) 2010-09-15
EP1524066A1 (en) 2005-04-20
US7793567B2 (en) 2010-09-14
DE602004004854D1 (de) 2007-04-05
CN102172848B (zh) 2013-06-05
US20070234849A1 (en) 2007-10-11

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