JP2005342797A - Nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nut absolutely preventing flying of a bearing outside even when it rotates at high speed. <P>SOLUTION: This nut 1A is furnished with a roughly ring fastening nut 2 to be screwed on an inner peripheral surface of a chuck mounting part 31 furnished with a collet 34 to hold a cutting tool, a roughly ring pressure contacting body 7 fitted on the fastening nut 2 and made contact with the collet 34 with pressure, a ring hole 15 formed along a surface where the fastening nut 2 and the pressure contacting body 7 make contact with each other, the bearing 5 inserted into the ring hole 15 and a partitioning body 20 to hold the bearing at a forming position of the ring hole, and an inserting hole 17 to insert the bearing 5 into the ring hole 15 is formed on the pressure contacting body 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present application relates to a nut attached to a chuck attachment portion of a cutting device such as a lathe.

  As shown in FIG. 7, a conventional nut 1C of this type has a tightening nut 56 that is screwed to the chuck body 55, and a nose that is fitted into the tightening nut 56 and press-contacted to the collet 57. Link 58. An annular hole 59 is formed between the fitting surfaces of the tightening nut 56 and the nose link 58, and a plurality of holes are inserted into the annular hole 59 through ball insertion holes 60 provided on the outer peripheral surface of the tightening nut 56. A ball 61 is inserted. The tightening nut 56 is provided with a pin insertion hole 62 penetrating the ball insertion hole 60 in the transverse direction, and a locking pin 63 is attached to the pin insertion hole 62 to prevent the ball from popping out. Further, the ball insertion hole 60 and the pin insertion hole 62 are filled with a filling 64 for locking the locking pin 63.

  A nut manufactured by inserting a ball from the outer periphery of such a tightening nut is disclosed in the following Patent Document (Patent Document 1).

Japanese Utility Model Publication No. 6-42007

  However, in such a conventional nut, in order to prevent the ball from slipping out of the ball insertion hole due to the centrifugal force due to high-speed rotation and jumping out to the outer periphery, a filling for locking the locking pin is necessary. The locking pin and the meat pressure corresponding to the filling are required on the outer peripheral side of the tightening nut, and the outer diameter of the nut body is increased. As the outer diameter increases, the weight of the nut itself increases and the power for rotating the nut at a high speed also increases.

  Further, as long as the ball insertion hole is outside the tightening nut, it is impossible to completely prevent the ball from jumping out with the locking pin and the filler, and the ball may slip out to the outer periphery during high-speed rotation.

  Moreover, in the manufacturing process for manufacturing the nut, an operation for filling the filling is required, and the operation process is increased as compared with the conventional method. In addition, since the number of work processes increases, the work cost also increases.

  Therefore, the present application was made by solving each of the above problems as an example of the problem, and is to provide a nut that is small in size, does not protrude from the outer periphery, can be easily manufactured, and costs can be reduced. Objective.

  In order to solve the above-mentioned problem, the nut (1A, 1B) according to claim 1 is a substantially annular tightening screwed onto a chuck body (31) including a collet (34) for holding a cutting tool. A nut (2), a substantially annular pressure contact body (7) fitted to the inner peripheral surface of the tightening nut and pressed against the collet, and a surface where the tightening nut and the pressure contact body are in contact with each other. A nut comprising: an annular hole (15); a bearing (5) inserted into the annular hole; and a partition (20, 42) for holding the bearing at a position where the annular hole is formed. A through hole (17, 41) for inserting the bearing into the annular hole is formed in the press contact body.

  The nut (1A) according to claim 2 is characterized in that the through hole communicates with the inner peripheral surface of the press contact body from the annular hole.

  The nut (1B) according to claim 3 is characterized in that the through hole communicates with the side surface of the press contact body from the annular hole.

  Hereinafter, the best embodiment of the present application will be described in detail with reference to FIGS. 1 to 3. FIG. 1 is a configuration diagram of a nut, FIG. 2 is a side view seen from the rear of FIG. 1, and FIG. In the following embodiment, for easy understanding, the vertical direction in FIG. 1 will be described as the vertical direction of the nut and the horizontal direction as the longitudinal direction of the nut. Further, as shown in FIG. 3, the nut 1A of the present application is attached to a chuck attaching portion 31 of a cutting device such as a lathe (not shown), and fixes a cutting tool such as a drill to the cutting device.

  First, the structure of the nut according to the present application will be described.

  As shown in FIGS. 1 and 2, a nut 1 </ b> A according to the present application includes a substantially annular tightening nut 2 and a substantially annular shape that is fitted to a front inner peripheral surface of the tightening nut 2 via a bearing 5. A nut body 10 having a pressure contact body 7 is provided.

  As shown in FIG. 3, the nut body 10 is attached to a chuck attachment portion 31 of a cutting device such as a lathe (not shown). The chuck attachment portion 31 is formed in an annular shape, and the front end portion of the chuck attachment portion 31 is formed with a screw portion 32 on the outer peripheral surface so that the opening narrows as the inner peripheral surface approaches the main body side of the machine tool. A tapered surface 33 is formed on the surface. The tapered surface 33 is fitted with a collet 34 for holding a cutting tool in which a plurality of split grooves are formed. The collet 34 is formed with tapered surfaces 36 and 37 that taper toward the front end portion and the rear end portion, and at a position where both the tapered surfaces 36 and 37 intersect with each other, a part of the press contact body 7 is formed on the outer peripheral surface. A fitting groove 39 to be fitted is formed. A taper surface 37 on the rear side of the collet 34 is slidably provided on the taper surface 33 formed on the inner peripheral surface of the chuck mounting portion 31. Further, the tapered surface 36 b formed on the inner peripheral surface of the press contact body 7 is in contact with the tapered surface 36 on the front side of the collet 34.

  Further, on the inner peripheral surface on the rear side of the tightening nut 2, a screw portion 11 is formed for screwing with a screw portion 32 formed on the outer peripheral surface of the chuck mounting portion 31. In addition, a plurality of concave grooves 13 for rotational operation are formed on the outer peripheral surface of the tightening nut 2 at predetermined intervals along the outer peripheral surface.

  In addition, in the fitting portion between the tightening nut 2 and the press contact body 7, bearing insertion grooves 2a and 7a having substantially semicircular cross sections are formed on the inner peripheral surface of the tightening nut 2 and the outer peripheral surface of the press contact body 7, respectively. An annular hole 15 for holding the bearing 5 is formed along the surface where the tightening nut 2 and the press contact body 7 are in contact with each other.

  Further, an insertion hole 17 for inserting the bearing 5 into the annular hole 15 is formed from the inner peripheral surface of the press contact body 7 toward the annular hole 15. Further, the pressure contact body 7 includes a partition body 20 that holds the bearing 5 inserted into the insertion hole 17 at a position where the annular hole 15 is formed and partitions the inside of the insertion hole 17 up and down. Specifically, pin insertion holes 21 are formed in the pressure contact body 7 so as to penetrate the both sides of the pressure contact body 7 in the transverse direction of the insertion hole 17 (in the direction of the axis 50 of the chuck mounting portion 31). The locking pin 20a is attached to the pin insertion hole 21. In this way, the bearing 5 can be held at a predetermined position, and the bearing 5 can be easily prevented from jumping out.

  In addition, the pin insertion hole 21 does not necessarily have to penetrate both side surfaces in the front-rear direction, and the partition body 20 such as the locking pin 20 a can be inserted from the outside, and the partition body 20 may be disposed inside the insertion hole 17. .

  Moreover, it is preferable that the locking pin 20a is equivalent to the diameter of the pin insertion hole 21, and is substantially the same length as it.

  Further, as shown in FIG. 4, a filling 25 may be loaded into the insertion hole 17 instead of the locking pin 20a. The filling 25 is made of an adhesive, and for example, an oil-resistant adhesive can be applied.

  Further, although not shown, the filling 25 may be loaded into the internal space of the insertion hole 17 below the locking pin 20a with the locking pin 20a inserted in FIG. An adhesive or the like may be applied to the locking pin 20a so that the locking pin 20a does not move when the locking pin 20a is inserted into the pin insertion hole 21.

  As described above, the nut 1A of the present embodiment includes the locking pin 20a for holding the insertion hole 17 and the bearing 5 on the press contact body 7 side and locking the bearing 5 from protruding to the outside. 5 is inserted from the inner peripheral surface of the pressure contact body 7 to manufacture the nut 1A, and thus the thickness t of the tightening nut 2 can be reduced. Therefore, the outer diameter of the nut 1A of the present embodiment can be made smaller than that of a conventional nut, so that the nut can be reduced in size. In addition, the miniaturization of the nut makes it possible to increase the speed with the same power as the conventional one.

  The chuck attachment portion 31 of the present embodiment functions as the chuck body of the present invention, and the insertion hole 17 of the present embodiment functions as the through hole of the present invention.

  Next, the usage aspect of a nut is demonstrated. For easy understanding, the reference numerals corresponding to those in FIG. 1 are used, but the nut is not limited thereto.

  First, a cutting tool such as a drill is inserted into the inner peripheral surface of the collet 34. Next, the rotary operation tool is locked in the concave groove portion 13 for rotation operation formed on the outer peripheral surface of the tightening nut 2 and rotated in the tightening direction. By this rotation, the screw portion 11 formed on the inner peripheral surface on the rear side of the tightening nut 2 is screwed with the screw portion 32 of the chuck mounting portion 31, and the tightening nut 2 together with the pressure contact body 7 is on the chuck mounting portion 31 side. Move to (see arrow in FIG. 3). With this operation, the tapered surface 7 b formed on the inner peripheral surface of the press contact body 7 is pressed against the tapered surface 36 on the front side of the collet 34, and the tapered surface 37 on the rear side of the collet 34 is in contact with the chuck mounting portion 31. Since it is pressed against the tapered surface 33 formed on the inner peripheral surface, the inner periphery of the collet 34 is reduced in diameter so that the cutting tool is pressed and clamped, and the cutting tool is fixed.

  Next, a nut according to a second embodiment of the present application will be described with reference to FIGS. 5 to 6, the same reference numerals are given to the portions common to FIGS. 1 and 2, and the description thereof is omitted.

  FIG. 5 shows the nut of the present embodiment, FIG. 5 (a) is a configuration diagram of the nut, FIG. 5 (b) is an enlarged view of A in FIG. 5 (a), and FIG. 6 is a side view seen from the rear of FIG. It is.

  As is apparent from these drawings, the nut 1B of the present embodiment has an insertion hole 41 for inserting the bearing 5 into the annular hole 15 from the side surface of the press contact body 7 toward the annular hole 15. . Specifically, the insertion hole 41 is formed in an approximately L shape from the rear side surface of the press contact body 7 toward the annular hole 15. The insertion hole 41 may be formed so as to communicate with the annular hole 15 from the front side surface of the press contact body 7.

  Further, as shown in FIG. 5B, the insertion hole 41 holds the bearing 5 at the position where the annular hole 15 is formed and prevents the bearing 5 from being pulled out through the insertion hole 41. The partition body 42 is inserted (mounted). For example, the partition 42 is a locking pin 43. Further, the filling 25 may be loaded into the insertion hole 41 instead of the locking pin 43. The filling 25 is made of an adhesive, and for example, an oil-resistant adhesive can be applied. In this way, the bearing can be held in a predetermined position, and the bearing can be easily prevented from popping out.

  In addition, the insertion hole 41 of this embodiment functions as a through-hole of this invention.

  As described above, the nut 1B of the present embodiment includes the locking pin 43a for holding the insertion hole 41 and the bearing 5 on the press contact body 7 side and locking the bearing 5 from protruding to the outside. 5 is inserted from the inner surface of the pressure contact body 7 to manufacture the nut 1B, so that the thickness t of the tightening nut 2 can be reduced. Therefore, the outer diameter of the nut 1B of the present embodiment can be made smaller than that of a conventional nut, so that the nut can be reduced in size. In addition, the miniaturization of the nut makes it possible to increase the speed with the same power as the conventional one.

  As described above, according to the above embodiment, the nuts 1A and 1B according to the present application include the substantially annular tightening nut 2 screwed to the chuck mounting portion 31 including the collet 34 for holding the cutting tool. A substantially annular pressure contact body 7 fitted to the inner peripheral surface of the tightening nut 2 and pressed against the collet 34; an annular hole 15 formed along a surface where the tightening nut 2 and the pressure contact body 7 contact; In nuts 1 </ b> A and 1 </ b> B having a bearing 5 inserted into the annular hole 15 and partition bodies 20 and 42 for holding the bearing at the position where the annular hole is formed, the press contact body 7 includes the annular hole 15. Insertion holes 17 and 41 for inserting the bearing 5 are formed. The insertion hole 17 is formed so as to communicate from the annular hole 15 to the inner peripheral surface of the press contact body 7. Further, the insertion hole 41 may be formed so as to communicate with the side surface of the press contact body 7 from the annular hole 15.

  Thus, since it was set as the structure which inserts the bearing 5 from the inner side of nut 1A, 1B, the jumping out of the ball by the centrifugal force of rotation can be prevented completely. Further, since the thickness of the tightening nut 2 can be reduced, the outer diameter of the entire nut can be reduced, and the nuts 1A and 1B can be reduced in size. Further, since the nuts 1A and 1B can be reduced in size, the conventional power can be rotated at high speed, and the running cost can be reduced. Further, since the nuts 1A and 1B can be made small, high speed rotation is possible.

It is a block diagram of the nut of this embodiment. It is the side view seen from the back of FIG. It is a figure which shows the usage condition of the nut of this embodiment. It is a figure which shows the other Example of a partition. The nut in 2nd Embodiment is shown, Fig.5 (a) is a block diagram of a nut, FIG.5 (b) is A enlarged view of Fig.5 (a). It is the side view seen from the back of Drawing 5. It is a block diagram of the conventional nut.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Nut 2 Clamping nut 5 Bearing 7 Pressure contact body 15 Annular hole 17, 41 Insertion hole 20, 42 Partition 20a, 43 Locking pin 21 Pin insertion hole 25 Filling 31 Chuck attachment part 34 Collet

Claims (3)

A substantially annular clamping nut screwed to a chuck body having a collet for sandwiching a cutting tool, a substantially annular pressure contact body fitted to an inner peripheral surface of the clamping nut and pressed against the collet; An annular hole formed along a surface where the clamping nut and the press contact body contact each other, a bearing inserted into the annular hole, and a partition for holding the bearing at a position where the annular hole is formed. In the nut to comprise,
A through hole for inserting the bearing into the annular hole is formed in the press contact body.   The nut according to claim 1, wherein the through hole communicates with the inner peripheral surface of the press contact body from the annular hole.   The nut according to claim 1, wherein the through hole communicates with the side surface of the press contact body from the annular hole.

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