JP3656376B2 - Rotary indexing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used for a turntable or the like of a machine tool, and has one end locked to a base and a rotary table rotatably supported by a bearing with respect to the base, and an annular member is opposed to the base. The present invention relates to a rotary indexing device that is arranged on the outer peripheral side of the surface and that is pressed by a pressing member and presses the annular member against the base to index the rotary table at a predetermined position.
[0002]
[Prior art]
A conventional rotary indexing device used for a turntable of a machine tool slides the table against the base when indexing the table, and presses and clamps the table against the guide surface when clamping the table. There was something to do.
[0003]
However, the above-mentioned sliding guide has a limit on the indexing rotation speed and requires high accuracy for processing of the sliding surface, and is expensive, and measures such as lubrication and wear of the sliding surface must be taken.
[0004]
In view of this, a table has been proposed in which the table is guided to the base by a rolling bearing. When guiding by a rolling bearing, it becomes a subject to make it the clamp system which does not make a clamping force act on a bearing. Examples of such are Japanese Utility Model No. 8-10505 and Japanese Utility Model Publication No. 4-32844.
[0005]
[Problems to be solved by the invention]
The rotary indexing device shown in the actual fairness 8-10505 still requires the high-precision machining because the friction surface F still exists even though the rolling bearing K is used as shown in FIG. At the same time, lubrication and wear countermeasures for the friction surface F are required. In addition, since the number of parts is large and the clamping mechanism C extends in the radial direction, a certain size is required in both the axial direction and the radial direction, and it is not possible to reduce the size particularly in the radial direction. There was a problem.
[0006]
On the other hand, the rotary indexing device shown in Japanese Utility Model Laid-Open No. 4-32844 has no friction surface. However, when a strong clamping force is obtained by this clamping device C, a considerable amount of the axial direction as shown in FIG. Since the length is required, there is a problem that the size cannot be reduced in the axial direction even if the size can be reduced in the radial direction.
[0007]
Therefore, the inventor presses an annular member, which is locked at one end of the rotary table and disposed on the outer peripheral side of the surface facing the base, by the pressing member and presses against the base. Focusing on the technical idea of the present invention to determine the rotary table that is rotatably supported via a bearing relative to the base, and further research and development, the structure is simplified and the number of parts is reduced. Thus, the present invention has been achieved to achieve the objectives of enabling miniaturization and cost reduction, and improving the rigidity of the table, extending the service life, and increasing the speed.
[0008]
[Means for Solving the Problems]
The rotary indexing device of the present invention (first invention according to claim 1) is:
The base,
A turntable supported rotatably on the base via a bearing;
An annular member disposed on the outer peripheral side of the surface facing the base of the rotary table and having one end locked to the rotary table;
A pressing member that presses the annular member against the base.
[0009]
The rotary indexing device of the present invention (the second invention according to claim 2)
In the first invention,
The said annular member is arrange | positioned rather than the rolling bearing which comprises the said bearing.
[0010]
The rotary indexing device of the present invention (the third invention according to claim 3),
In the second invention,
The annular member is provided with a protruding portion that protrudes from the outer periphery of the rotary table while locking the inner peripheral side end portion thereof to the rotary table.
[0011]
The rotary indexing device of the present invention (the fourth invention according to claim 4) is:
In the third invention,
The pressing member is inserted between the rotary table and an annular ring that is fixed to the base and constitutes a cylinder together with the outer periphery of the rotary table, and presses the protruding portion of the annular member against the base It is constituted by a piston.
[0012]
The rotary indexing device of the present invention (the fifth invention according to claim 5) is:
In any one of the first to fourth inventions,
The annular member has a thin portion formed at the center in the radial direction.
[0013]
The rotary indexing device of the present invention (the sixth invention according to claim 6) is:
In any one of the first invention to the fifth invention,
The annular member is made of a highly elastic metal.
[0014]
The rotary indexing device of the present invention (the seventh invention according to claim 7) is:
In the second invention,
The annular member is constituted by a projecting portion formed to project radially outward from an outer peripheral side of the rotary table so as to be elastically deformable,
A piston as the pressing member is inserted into a cylinder formed in an annular ring fixed to the base on the outer peripheral side of the rotary table so as to face the protruding portion.
[0015]
Operation and effect of the invention
In the rotary indexing device of the first invention having the above-described configuration, one end of the rotary indexing device is locked to the rotary table, and the annular member disposed on the outer peripheral side of the facing surface with respect to the base is pressed by the pressing member. By pressing against the base, the rotary table that is rotatably supported by the base via the bearing is indexed to a predetermined position, thus simplifying the configuration and reducing the number of parts. There exists an effect of enabling size reduction and cost reduction.
[0016]
In the rotary indexing device of the second invention configured as described above, in the first invention, the annular member is disposed on the outer peripheral side of the rolling bearing constituting the bearing. Since it is clamped, the clamping force is strengthened to improve the rigidity of the rotary table, and the clamping force does not act on the rolling bearing and there is no sliding friction surface, so that the life of the rotary table is extended. Play.
[0017]
According to a third aspect of the present invention, there is provided the rotary indexing device according to the second aspect, wherein the annular member has an inner peripheral side end locked to the rotary table and protrudes from the outer periphery of the rotary table. Since the projecting portion of the annular member is pressed by the pressing member and the rotary table is clamped, the clamping force is further strengthened and the rigidity of the rotary table is improved. .
[0018]
According to a fourth aspect of the present invention, there is provided the rotary indexing device according to the third aspect, wherein the rotary table is interposed between the rotary table and the annular ring which is fixed to the base and forms a cylinder together with the outer periphery of the rotary table. By the piston as the pressing member, the projecting portion of the annular member is pressed against the base, and the rotary table is clamped, so that the clamping force is enhanced.
[0019]
In the rotary indexing device according to a fifth aspect of the present invention having the above-described configuration, in any one of the first to fourth aspects, the annular member is formed with the thin portion at the center in the radial direction. Since the thin portion is elastically deformed when the protruding portion of the annular member is pressed against the base, the pressing force of the piston is prevented from acting on the rotary table and the rolling bearing. This has the effect of extending the life of the.
[0020]
In the rotary indexing device of the sixth invention configured as described above, in any of the first to fifth inventions, the annular member is made of a highly elastic metal, so that the thin wall portion is effectively elastic. Since it deforms, the pressing force of the piston is prevented from acting on the rotary table and the rolling bearing, so that the effect of further extending the life of the rotary table is achieved.
[0021]
According to a seventh aspect of the present invention, there is provided the rotary indexing device according to the second aspect, wherein a cylinder ring is formed in an annular ring fixed to the base on the outer peripheral side of the rotary table so as to face the protrusion. The piston as the pressing member inserted into the pressing member presses the protruding portion as the annular member formed to protrude outward in the radial direction so as to be elastically deformable from the outer peripheral side of the rotary table. Since the rotary table is clamped by being elastically deformed and pressed against the base, the annular member as a separate member is not required, the number of parts is reduced, and the size and cost are reduced. It is possible to achieve a long life and high speed of the rotary table because the piston is prevented from sliding with the outer peripheral surface of the rotary table. Achieve the results.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0023]
(First embodiment)
As shown in FIG. 1, the rotary indexing device of the first embodiment includes a base 1, a rotary table 2 that is rotatably supported on the base 1 via a bearing 3, and the rotary table 2. An annular member 4 disposed on the outer peripheral side of the surface facing the base 1 and having one end locked to the rotary table 2 and a pressing member for pressing the annular member 4 against the base 1 It consists of five.
[0024]
As shown in FIG. 1, the base 1 has a circular hole formed in the center, and a shoulder 14 is formed with a step portion on which a cross roller bearing 30 as a rolling bearing constituting the bearing 3 is placed. A worm insertion hole through which a bearing retainer 15 that holds the outer ring 31 of the cross roller bearing 30 is fixed by bolts from above and a worm 71 that rotationally drives the rotary table 2 and a wheel 72 that meshes with the worm 71 is inserted. 16 is drilled.
[0025]
The base 1 is formed with a hydraulic pressure supply source 12 (not shown) and a pressure hydraulic pressure supply passage 12 communicating with the air supply source and an air supply passage 13 for returning the piston in the upper edge, one end of which will be described later. The cylinder 50 and the annular ring 40 constituting the annular member 4 are opened.
[0026]
As shown in FIG. 1, the rotary table 2 includes a table portion 20 of an annular disk on which a plurality of bolt holes for fixing a workpiece are drilled on the upper surface and the workpiece is placed, and a lower surface of the table portion 20. And a stepped cylindrical portion 22 of a hollow cylindrical body having an outer diameter larger than the inner diameter of the circular hole of the base 1.
[0027]
The wheel 72 that meshes with the worm 71 is fixed to the lower end of the stepped cylindrical portion 22 by a bolt, and the inner ring 32 of the cross roller bearing 30 that constitutes the bearing 3 is placed on the outer peripheral wall of the center portion. A stepped portion is formed, and a bearing retainer 25 that holds the inner ring 32 of the cross roller bearing 30 from above is fixed by a bolt.
[0028]
The annular member 4 is constituted by an annular plate 40 having a U-shaped cross section made of a highly elastic metal disposed on the outer peripheral portion of the lower surface of the table portion 20 facing the base 1. Yes.
[0029]
The annular plate 40 has its inner peripheral side end 41 locked to the rotary table 2, and a thin portion 42 formed by an annular recess is formed on the lower surface in the center in the radial direction, and protrudes from the outer periphery of the rotary table 2. The protrusion 43 is provided.
[0030]
In the cylinder 50 comprised by the inner peripheral wall of the annular ring 6 to which the said press member 5 was fixed to the said base 1, and was fixed to the upper outer periphery of the said rotary table 2 with the volt | bolt, and the outer peripheral wall of the said rotary table 2 It is comprised by the piston 51 inserted.
[0031]
The piston 51 has a substantially crank-shaped cross-sectional shape, and the step portion abuts on the thick projecting portion 43 of the annular plate 40 to form the hydraulic pressure formed on the base 1 and the annular ring 6. The protrusion 43 of the annular plate 40 is configured to be pressed against the base 1 by the hydraulic pressure supplied through the supply passage 12.
[0032]
The worm 71 is driven to rotate by a motor (not shown) that rotates based on a rotation command, so that the rotary table 2 is indexed to a predetermined position in cooperation with the annular plate 40 and the piston 51. It is configured.
[0033]
An oil seal is disposed on a portion of the inner peripheral wall surface of the annular ring 6 constituting the cylinder 50 where the piston 51 is located and on the outer peripheral wall surface of the rotary table 2.
[0034]
The rotary indexing device according to the first embodiment having the above-described configuration is for indexing to a predetermined position by rotating the rotary table 2 by rotating a motor (not shown) connected to the worm 71. .
[0035]
When hydraulic pressure is supplied from the hydraulic pressure source to the cylinder 50 via the hydraulic pressure supply passage 12, the piston 51 descends and presses the protrusion 43 at one end of the annular plate 40.
[0036]
Since the annular plate 40 is made of a highly elastic metal, the thin portion 42 at the center is elastically deformed when pressed by the piston 51, and is pressed and fixed to the base 1, and as a result, the rotary table. 2 is clamped to the base 1.
[0037]
When unclamping, the hydraulic pressure in the cylinder 50 is released, air is supplied from below the piston 51 through the air supply passage 13, and the piston 51 is raised by the air pressure. As a result, the annular plate 40 is restored by its own elastic force.
[0038]
In the rotary indexing device of the first embodiment that exhibits the above-described action, one end of the rotary indexing device is locked to the rotary table 2 and the annular plate 40 disposed on the outer peripheral side of the facing surface with respect to the base 1 is replaced with the pressing member. By pressing against the base 1 by being pressed by the piston 51 as 5, the rotary table 2 rotatably supported via the bearing 3 is indexed to a predetermined position with respect to the base 1. The structure is simplified, and the number of parts is reduced, thereby reducing the size and cost.
[0039]
Further, in the rotary indexing device of the first embodiment, the annular plate 40 is disposed on the outer peripheral side of the cross roller bearing 30 constituting the bearing 3, so that it is clamped on the outer peripheral side of the rotary table 2. Therefore, the clamping force is strengthened to improve the rigidity of the rotary table 2, and since the clamping force does not act on the cross roller bearing 30 and there is no sliding friction surface, the rotary table 2 can be indexed at high speed. And has the effect of extending the life.
[0040]
Further, in the rotary indexing device of the first embodiment, the annular plate 40 includes the projecting portion 43 whose inner peripheral side end is locked to the rotary table 2 and projects from the outer periphery of the rotary table 2. Therefore, since the protrusion of the annular member is pressed by the pressing member and the rotary table is clamped, the clamping force is further strengthened, and the rigidity of the rotary table is improved.
[0041]
The rotary indexing device according to the first embodiment includes the piston that is fixed between the base 1 and interposed between the annular ring 6 that constitutes the cylinder together with the outer periphery of the rotary table 2 and the rotary table 2. 51, the projecting portion 43 of the annular plate 40 is pressed against the base 1 and the rotary table 2 is clamped. Therefore, since it is an outer periphery clamp, a very large clamping torque is obtained and the clamping force is increased. For example, there is an effect that it can withstand a large cutting torque.
[0042]
Furthermore, in the rotary indexing device of the first embodiment, the annular plate 40 made of a highly elastic metal has the thin portion 42 formed by a concave portion at the center in the radial direction. Since the thin portion 42 is easily elastically deformed when the protruding portion 43 of the plate 40 is pressed against the base 1, the pressing force of the piston 51 acts on the rotary table 2 and the cross roller bearing 30. As a result, the reliability is improved and the life of the rotary table 2 is extended.
[0043]
The thin-walled portion 42 formed by the concave portion is made extremely thin so that it can be easily bent in the axial direction, and the width of the thin portion is designed to the minimum necessary to ensure the rigidity in the rotational direction.
[0044]
In addition, the rotary indexing device of the first embodiment has an effect that the internal structure of the rotary table 2 can be simplified and a distributor and the like can be incorporated therein.
[0045]
Furthermore, since the clamping mechanism can be made smaller, the diameter of the base 1 can be increased, and by making this a hollow, piping to a jig or the like provided on the table is made using this space. I can do it. Conventionally, since the diameter of the shaft cannot be increased, hydraulic pressure is supplied to a jig or the like using a distributor.
[0046]
(Second Embodiment)
As shown in FIG. 2, the rotary indexing device of the second embodiment is configured such that the annular member 4 is constituted by a protruding portion 44 that is formed to protrude on the outer peripheral side of the rotary table. This is the difference.
[0047]
As shown in FIG. 2, the protruding portion 44 formed to protrude outward in the radial direction on the outer peripheral side of the turntable 2 has a notch 27 formed on the lower surface of the portion corresponding to the outer peripheral wall of the turntable 2. It is configured to be elastically deformable.
[0048]
On the outer peripheral side of the turntable 2, a piston 55 as the pressing member 5 is inserted into a cylinder 66 that is formed in the annular ring 6 fixed to the base 1 so as to face the protruding portion 44. It is what.
[0049]
In the rotary indexing device of the second embodiment having the above-described configuration, the cylinder formed by drilling the annular ring 6 fixed to the base 1 on the outer peripheral side of the rotary table 2 so as to face the protruding portion 44. Since the piston 55 inserted in 66 presses the protruding portion 44 as the annular member formed so as to be elastically deformable radially outward from the outer peripheral side of the rotary table 2, the protruding portion 44 is elastically deformed and pressed against the base 1, whereby the rotary table 2 is clamped and indexed to a predetermined position.
[0050]
In the rotary indexing device according to the second embodiment that exhibits the above-described action, the piston 55 presses the protruding portion 44, so that the protruding portion 44 is elastically deformed and pressed against the base 1. Since the rotary table 2 is clamped, the annular member as a separate member is not required, and the number of parts is reduced, thereby enabling reduction in size and cost.
[0051]
Further, in the rotary indexing device of the second embodiment, the piston 55 inserted in the cylinder 66 formed in the annular ring 6 and reciprocatingly moves the outer peripheral surface of the rotary table 2 of the piston 55 to the cylinder. Since it is not a surface, avoiding sliding with the outer peripheral surface of the turntable 2 has the effect of realizing a long life and speeding up of the turntable 2.
[0052]
The above-described embodiments have been illustrated for the purpose of explanation, and the present invention is not limited thereto. Those skilled in the art will recognize from the claims, the detailed description of the invention, and the description of the drawings. Modifications and additions can be made without departing from the technical idea of the present invention.
[0053]
In the above-described embodiment, the example of the rotation transmission mechanism that rotates the table with the worm and the wheel is described as an example. However, the present invention is not limited thereto, and for example, a built-in motor can be adopted. .
[0054]
In the above-described embodiment, an example in which the elastic ring is pressed from above by the piston has been described as an example, but the present invention is not limited thereto, and for example, the piston is provided under the elastic ring as a sleeve, A mode in which hydraulic pressure is supplied from below can be employed.
[0055]
In the first embodiment described above, an example in which air is used during unclamping has been described as an example, but the present invention is not limited thereto, and the piston is moved upward by the restoring force due to the elasticity of the annular plate itself. It is possible to adopt a mode in which the number of components is reduced, or a mode in which means for raising the piston (spring, hydraulic pressure, etc.) is provided when the hydraulic pressure is released as employed in the second embodiment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a rotary indexing device according to a first embodiment of the present invention.
FIG. 2 is a partial cross-sectional view showing a main part of a rotary indexing device according to a second embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a conventional first rotary indexing device.
FIG. 4 is a cross-sectional view showing a second conventional rotary indexing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2 Rotary table 3 Bearing 4 Annular member 5 Pressing member

Claims (7)

The base,
A turntable supported rotatably on the base via a bearing;
An annular member disposed on the outer peripheral side of the surface facing the base of the rotary table and having one end locked to the rotary table;
A rotary indexing device comprising: a pressing member that presses the annular member against the base. In claim 1,
The rotary indexing device, wherein the annular member is arranged on the outer peripheral side of a rolling bearing constituting the bearing. In claim 2,
The rotary indexing device is characterized in that the annular member has an inner peripheral side end locked to the rotary table and has a protruding portion protruding from the outer periphery of the rotary table. In claim 3,
The pressing member is inserted between the rotary table and the annular ring that is fixed to the base and constitutes a cylinder together with the outer periphery of the rotary table, and presses the protruding portion of the annular member against the base A rotary indexing device comprising a piston. In any one of Claim 1 thru | or 4,
The annular indexing device is characterized in that a thin wall portion is formed at the center in the radial direction. In any one of Claims 1 thru | or 5,
The rotary indexing device, wherein the annular member is made of a highly elastic metal. In claim 2,
The annular member is constituted by a projecting portion formed to project radially outward from the outer peripheral side of the rotary table so as to be elastically deformable,
A rotary split, wherein a piston as the pressing member is inserted in a cylinder formed in an annular ring fixed to the base on the outer peripheral side of the rotary table so as to face the projecting portion. Out device.

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