JP5498220B2 - Angle head - Google Patents

Description

  The present invention relates to an angle head provided with a drill drive shaft that is driven around a drill axis that is transmitted from an output shaft of a head body and is orthogonal to the axis of the output shaft.

The angle head described above is provided at the tip of the head body mounted on the machine tool. An output shaft that is rotationally driven is provided on the machine tool side. The angle head converts this rotational driving force into a direction orthogonal to the front end side of the device, and for example, processes various holes in a direction perpendicular to the insertion direction of the front end of the device inside a narrow hole. .
Conventionally, as an apparatus for performing such processing, for example, there has been the following.

  For example, Patent Document 1 discloses an angle head that can easily and easily change the angle in the blade edge direction of a rotary tool. In this technique, a non-rotating bearing member 3 of an angle head is connected to a machine tool body that cannot rotate, and a rotating shaft 1 that is rotatably supported by the non-rotating bearing member 3 is attached to a rotatable main shaft 2 of the machine tool. Connected. The cutting tool is supported by the head body, and is rotated by being transmitted with power from the rotating shaft. The head main body is configured to be rotatable relative to the non-rotating support member and to be fixed at a predetermined relative rotational position. This device is intended to improve the convenience of drilling by arbitrarily changing and setting the direction of the cutting tool in this way.

  In this prior art, the rotating tool is attached in the following manner. That is, an angle shaft capable of rotating at an angle of 90 degrees with respect to the axis of the rotary shaft is provided inside the head main body, and the rotational drive from the rotary shaft is linked to the angle shaft via a bevel gear. A cutting tool such as a drill is attached to the angle shaft, and a chuck is used at that time. This chuck is provided on the side of the cutting tool with respect to the angle shaft, and although a detailed configuration is not described in the specification, it is considered that the chuck is screwed to the angle shaft while being extrapolated to the cutting tool. As a result, the cutting tool is pressed against the angle shaft, and the cutting tool is fixed by frictional force or the like.

Japanese Patent Laid-Open No. 2002-103154

However, in the conventional method for fixing a cutting tool, since the chuck member is positioned on the drill side, a wide space on the drill side cannot be secured. Therefore, the drilling depth of the drill is shortened, and the size of the hole into which the tip of the head main body can be inserted is limited, resulting in poor workability.
In addition, the drawing of this publication shows a chuck member that is determined to have a cap shape. However, if the cutting tool is to be held firmly using such a member, the lid portion of the chuck member may be deformed when the cutting tool is pressed. For this reason, the entire size of the chuck member may become excessive, for example, the cap member needs to have sufficient rigidity. As described above, the conventional angle head still has room for improvement, such as a decrease in drilling workability in a minimal space.

  An object of the present invention is to provide an angle head that can hold a drill firmly and that has a compact head tip.

The characteristic configuration of the angle head according to the first aspect of the present invention is that a head main body mounted on a machine tool, an output shaft provided on the head main body so as to be rotatable around an output shaft core, a drill is mounted, and the output A drill drive shaft that rotates around a drill shaft orthogonal to the shaft core, and a rotation interlocking mechanism that transmits the rotation of the output shaft to the drill drive shaft, and a screw portion is formed on one of the drills A taper shank portion, a drill drive gear for transmitting rotation from the rotation interlocking mechanism to the drill drive shaft, a tapered drill attachment hole into which the taper shank portion can be inserted, and A through hole located at the bottom, and a connecting screw for fastening the drill is configured to be screwable with the threaded portion of the tapered shank through the through hole ,
The rotation interlocking mechanism is
An input bevel gear that rotates integrally with the output shaft, a bevel gear portion that meshes with the input bevel gear and that rotates around a bevel gear shaft that is orthogonal to the output shaft core, and that rotates integrally with the bevel gear portion coaxially. A rotary transmission having a spur gear, an input spur gear meshing with the spur gear and rotating about an input gear shaft parallel to the bevel gear shaft, and an output gear shaft parallel to the bevel gear shaft An output spur gear that rotates around the transmission gear, and a transmission spur gear that rotates around the transmission gear shaft parallel to the bevel gear shaft core by interlocking the input spur gear and the output spur gear.
The bevel gear shaft core, the input gear shaft core, the transmission gear shaft core, the output gear shaft core, and the drill shaft core are juxtaposed along a straight line parallel to the output shaft core,
The bevel gear portion is arranged on the side opposite to the side where the output shaft is located with respect to the flat gear portion .

If the drill shank is attached to the drill drive shaft and the drill is pulled by the connecting screw from the opposite side of the drive shaft as in this configuration, a conventional chuck member or the like must be provided on the drill cone side. Absent. Therefore, a wider space on the cone portion side can be secured, and deep drilling can be performed even in a narrow work area.
Connecting screw used for fixing the screwed into a screw portion provided in the tapered shank portion, a tensile fixes the taper shank portion via a through hole formed in the bottom of the drill drive shaft. When the taper shank portion is pressed and fixed to the drill mounting hole, a method of pressing the drill from the cone portion side to the drill drive shaft side can also be adopted. However, in that case, the size of the fastening means itself becomes large, for example, a chuck member wider than the outer shape of the drill must be fitted on the drill drive shaft. However, as in this configuration, if the drill is pulled from the back side to the drill drive shaft side, for example, it is easy to configure the connecting screw using a screw having a diameter smaller than the outer diameter of the drill. Therefore, with this configuration, the size of the fastening means itself can be made compact, and an angle head with a thin tip can be provided.

Like this structure, the size of the case which accommodates a rotation interlocking | linkage mechanism can be comprised small by arranging several flat gears in parallel. When power is transmitted using a spur gear, the moment acting on the spur gear varies depending on the radius of the spur gear. This radius is determined based on the rotational torque required for the drill, the torque that can be input by the output shaft, the material constituting the spur gear, and the like. For this reason, there is a certain limitation even if the overall size of the spur gear is reduced. However, the overall shape of the spur gear requires a predetermined width in the tooth plane direction, but there is a certain degree of freedom in determining the size in the axial direction.
Therefore, as in the present configuration, if the axial center direction of the flat gear is made perpendicular to the output shaft core, and a plurality of flat gears are arranged side by side, in the cross-sectional view perpendicular to the parallel arrangement direction, Although the length in the radial direction cannot be reduced so much, the length of the rotating shaft can be easily shortened. Thus, with this configuration, the thickness of one of the cases accommodating the rotation interlocking mechanism, that is, the length in the direction along the rotation axis of the drill can be shortened, and the case can be made compact. Drilling work becomes easier.

  Further, in the apparatus of this configuration, the rotation shaft cores of the respective flat gears are arranged side by side along a straight line parallel to the output shaft core, so that the width of these wheel trains can be kept to a minimum. Furthermore, with this configuration, when arranging the same spur gears, it is possible to ensure the longest distance from the output shaft to the drill as compared with a configuration in which the rotation shaft cores are arranged in a staggered manner. Therefore, it is possible to provide an angle head that can easily cope with a deep working space.

As in this configuration, in order to configure the rotary transmission body, a flat gear portion that is integrally attached to the bevel gear portion is provided on the output shaft side with respect to the bevel gear portion that meshes with the input bevel gear of the output shaft. The other spur gear portion connected to the spur gear portion is juxtaposed at a position close to the output shaft. For this reason, the entire tip of the angle head is formed at a position close to the output shaft core, and the radial size of the entire angle head can be reduced.
Furthermore, with this configuration, the bevel gear portion needs to receive driving force from the input bevel gear, so the outer diameter of the flat gear portion is inevitably outside of the bevel gear portion to avoid interference with the input bevel gear. It becomes smaller than the diameter. When considering the outer size of the angle head, the size in the width direction perpendicular to the axis of rotation of the drill depends on the diameter of the large bevel gear portion. Therefore, in order to insert the device into a hole as small as possible, it is preferable that the bevel gear portion is close to the center position in the direction along the rotation axis of the drill in the tip portion of the device. However, since the cone portion of the drill has a predetermined length, the position where the bevel gear portion is provided is limited. In order to position the bevel gear portion at the center of the apparatus, it is advantageous to approach the side of the drill. Therefore, as in this configuration, by providing the flat gear portion having a small outer diameter on the output shaft side with respect to the bevel gear portion, the shape of the tip portion of the angle head can be configured more compactly.

The characteristic configuration according to the angle head of the second aspect of the present invention is that the plane including the protruding position of the drill among the surfaces forming the tip portion of the head case that houses the rotation interlocking mechanism and the drill drive gear is It is in the point which becomes a level difference part which retreated from the surface adjacent to the base end side of the head part case to a plane.

  If it is this structure, the drilling depth by a drill can be ensured more largely. There is a case where a boss portion having a large diameter exists at the base end portion of the drill, or a portion for engaging a tool for attaching a drill is provided on a drill drive shaft on which the drill is mounted. As in this configuration, by retreating the plane around the drill base end portion of the plane of the head portion case from the forefront of the head portion case, the step can be used as an arrangement space for the boss portion and the like. Since the drilling depth of the drill is often determined by the length of the drill protruding from the forefront of the head part case, the effective length of the drill can be maximized by providing the above configuration.

The characteristic configuration according to the angle head of the third aspect of the invention is characterized in that chips scattered from the drill are disposed at a boundary position between the step portion and a surface adjacent to the base end side of the head portion case with respect to the step portion. In the point which formed the inclined surface scattered in the direction away from the said drill.

  According to this configuration, the chips scattered from the drill drive shaft are scattered in a direction away from the drill drive shaft by the inclined surface of the case outer surface at the stepped portion. Therefore, it is possible to obtain an angle head capable of efficiently performing a drilling operation without causing chips scattered from the drill drive shaft to adhere to the drill drive shaft again and obstruct cutting.

It is a front view which shows the whole angle head. It is a perspective view which shows the front-end | tip part of an angle head. It is a side view which shows the front-end | tip part of an angle head. It is a bottom view which shows the front-end | tip part of an angle head. It is explanatory drawing which shows the vertical front view of an angle head, and the arrangement | sequence of a flat gear. It is explanatory drawing which shows the structure of a connection means. It is a vertical front view which shows the head part which concerns on 1st another embodiment. It is a vertical front view which shows the head part which concerns on 2nd another embodiment. It is a cross-sectional top view which shows the front-end | tip part of a case . It is explanatory drawing which shows the removal jig | tool of a drill .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing an entire angle head according to an embodiment of the present invention. This angle head includes a head main body frame 1, a head main body A having a rotation shaft 2 rotatably supported by the head main body frame 1, a head portion case 10 having a base end connected to the head main body frame 1, And a head part B having a drill drive shaft 20 rotatably supported at the tip of the head part case 10.

  This angle head is mounted on a machine tool (not shown) by the head body A. The drill drive shaft 20 is rotationally driven by the power transmitted from the machine tool via the head body A, and the drill 30 attached to the drill drive shaft 20 is rotationally driven. The apparatus in which the tip end side of the head case 10 is inserted into the hole of the workpiece by operation with a machine tool and drilled in the inner wall of the workpiece, for example, processing of a casing or the like constituting the hydraulic equipment of the power steering device Used for.

(Head body)
The head main body A is provided with a taper shaft portion 2 a provided on an end side of the rotary shaft 2 opposite to the side supported by the head main body frame 1, and the head main body frame 1 arranged in parallel with the rotary shaft 2. The positioning pin 3 is provided. In the head body A, the taper shaft portion 2a is connected to the main shaft (not shown) of the machine tool, and the positioning pin 3 is attached to the positioning block (not shown) of the machine tool, whereby the angle head is attached to the machine tool. On the other hand, the angle head is driven and operated by the machine tool by being connected in a predetermined connection state.

  As shown in FIG. 5, the head main body A includes an output shaft 4 provided at a position on the opposite side of the head main body frame 1 from the side where the tapered shaft portion 2 a of the rotation shaft 2 is located. . The distal end side of the output shaft 4 is disposed inside the proximal end portion of the head portion case 10 and is interlocked with the drill drive shaft 20. The output shaft 4 is rotationally driven around the output shaft core 4 a by the driving force from the machine tool, and transmits power to the drill drive shaft 20. The output shaft core 4 a of the output shaft 4 is configured to coincide with the rotational shaft core of the rotating shaft 2.

(Head)
2A and 2B are perspective views showing the tip of the head part B. FIG. FIG. 5 is a longitudinal front view showing the head part B. FIG. As shown in these drawings, the drill drive shaft 20 rotates around a drill axis 20 a orthogonal to the output axis 4 a of the output shaft 4. A drill mounting hole 21 (see FIG. 6) is formed in the drill drive shaft 20. A tool locking surface 20b for locking the tool when the drill 30 is mounted is provided at the opening side end of the drill mounting hole 21. The drill drive shaft 20 is provided in a state in which the tool locking surface 20 b protrudes from the surface of the head part case 10.

  As shown in FIG. 5, the head part B is mainly composed of a head part case 10. The head case 10 is internally provided with a transmission device 40 connected to the input bevel gear 41 of the output shaft 4. The transmission device 40 transmits the driving force from the output shaft 4 to the drill driving shaft 20. The drill drive shaft 20 rotationally drives the held drill 30 around the drill axis 20a.

(Transmission device)
As shown in FIG. 5, the transmission device 40 includes an input bevel gear 41 coupled to the output shaft 4 and a rotation interlocking mechanism that transmits the rotation of the input bevel gear 41 to the drill 30. In particular, the one shown in FIG. 5 has a rotation transmission mechanism 42 in which a bevel gear portion 42a is engaged with an input bevel gear 41 and an input flat gear 51 in engagement with a flat gear portion 42b of the rotation transmission member 42 as a rotation interlocking mechanism. The gear interlocking mechanism 50 is provided, and the drill driving gear 22 meshed with the output spur gear 52 included in the gear interlocking mechanism 50 is provided.
The input bevel gear 41 is connected to the output shaft 4 of the head main body A so as to be integrally rotatable, and rotates around the output shaft core 4a.

  The rotation transmission body 42 is a single rotation that supports the bevel gear portion 42a that meshes with the input bevel gear 41, the flat gear portion 42b that meshes with the input flat gear 51 of the gear interlocking mechanism 50, and the bevel gear portion 42a and the flat gear portion 42b. And a support shaft 42c. The bevel gear portion 42a and the flat gear portion 42b are connected to the rotation support shaft 42c so as to be rotatable integrally with each other, and around the bevel gear shaft core 42d formed by the shaft core of the rotation support shaft 42c orthogonal to the output shaft core 4a of the output shaft 4. Rotates together.

  The gear interlocking mechanism 50 is positioned between the input flat gear 51 that meshes with the flat gear portion 42 b of the rotary transmission 42, the output flat gear 52 that meshes with the drill drive gear 22, and the input flat gear 51 and the output flat gear 52. A transmission spur gear 53 is provided.

  The input spur gear 51 is rotatably supported by the head case 10 via a support shaft 51a, and rotates around an input gear shaft core 51b composed of a shaft shaft of a support shaft 51a parallel to the bevel gear shaft core 42d. The output spur gear 52 is rotatably supported by the head case 10 via a support shaft 52a, and rotates around an output gear shaft 52b that is a shaft of a support shaft 52a parallel to the bevel gear shaft core 42d.

  The transmission spur gear 53 is rotatably supported by the head case 10 via a support shaft 53a, and rotates around a transmission gear shaft core 53b formed of a shaft core of a support shaft 53a parallel to the bevel gear shaft core 42d. The transmission spur gear 53 meshes with the input spur gear 51 and the output spur gear 52, and interlocks the input spur gear 51 and the output spur gear 52.

  The drill drive gear 22 is configured to rotate integrally with the drill drive shaft 20 and rotates around the drill shaft core 20a. The drill drive gear 22 may be formed by cutting out from a single member with the drill drive shaft 20, or a gear portion may be welded to the drill drive shaft 20. Moreover, you may fix to the drill drive shaft 20 using a key etc.

  Therefore, in the transmission device 40, the input bevel gear 41 and the bevel gear portion 42a of the rotating transmission body 42 constitute a power conversion unit 43, and the driving force around the output shaft core 4a of the output shaft 4 is output by the power conversion unit 43 to the output shaft. The driving force is converted around the bevel gear shaft core 42d orthogonal to the core 4a. The converted driving force is transmitted from the spur gear portion 42b to the drill driving gear 22 via the input spur gear 51, the transmission spur gear 53, and the output spur gear 52 of the gear interlocking mechanism 50. Thereby, the driving force around the output shaft core 4a of the output shaft 4 is transmitted to the drill driving shaft 20 in a state where it is converted into the driving force around the drill shaft core 20a.

  The teeth of the input bevel gear 41, the bevel gear portion 42a, the flat gear portion 42b, the input flat gear 51, the transmission flat gear 53, the output flat gear 52, and the drill driving gear 22 are engaged with each other with little play and little noise. It is better to apply special resin coating. For example, the backlash of each gear due to backlash can be suppressed by filling the head case 10 with lubricating oil and applying hydraulic pressure.

  As shown in FIGS. 1 and 5A, the head case 10 is connected to the head body frame 1, and also includes an input case 12 that accommodates the input bevel gear 41, and the head body A from the input case 12. The driving case portion 13 extends toward the opposite side to the positioned side. The drive case portion 13 accommodates the rotary drive body 42, the gear interlocking mechanism 50, and the drill drive gear 22 and supports the drill drive shaft 20.

  The input case portion 12 includes an input case wall 12a that is positioned in a state orthogonal to the output shaft 4 on the side opposite to the side on which the head main body frame 1 is positioned with respect to the input bevel gear 41. The input case wall 12 a includes an output shaft support portion 12 b provided on the inner surface side thereof, and supports the end portion of the output shaft 4 via the bearing 14 by the output shaft support portion 12 b.

  The drive case portion 13 has a bevel gear shaft core 42d and an input gear shaft core on the side where the output shaft 4 is located with respect to the spur gear portion 42b, the input spur gear 51, the transmission spur gear 53, the output spur gear 52 and the drill drive gear 22. 51b, a transmission gear shaft core 53b, an output gear shaft core 52b, and a main case wall 13a positioned perpendicular to the drill shaft core 20a. The main case wall 13a includes a support portion 13b provided on the inner surface side thereof corresponding to the flat gear portion 42b, the input flat gear 51, the transmission flat gear 53, the output flat gear 52, and the drill drive gear 22, The rotation support shaft 42c of the rotary transmission 42, the support shaft 51a of the input flat gear 51, the support shaft 53a of the transmission flat gear 53, the support shaft 52a of the output flat gear, and the drill drive shaft 20 are supported by the support portion 13b via bearings. To do.

As shown in FIG. 5B, the bevel gear shaft core 42 d of the rotating transmission body 42, the input gear shaft core 51 b of the input flat gear 51, the transmission gear shaft core 53 b of the transmission flat gear 53, and the output gear shaft of the output flat gear 52. The core 52a and the drill shaft core 20a are arranged along the straight line L in a state orthogonal to the straight line L parallel to the output shaft core 4a. Accordingly, the drive case 13 in the head case 10 is formed in a direction perpendicular to the direction in which the flat gear portion 42b, the input flat gear 51, the transmission flat gear 53, the output flat gear 52, and the drill driving gear 22 are arranged, and the flat gear. The portion 42b and the flat gears 51, 53, 52, and 22 have a relatively small size in the direction along the radial direction.
In other words, since the rotation shaft cores of the respective flat gears are arranged in parallel along a straight line parallel to the output shaft core 4a, the width of these wheel trains can be minimized. Furthermore, with this configuration, when the input flat gears 51 having the same shape are arranged, it is possible to ensure the longest distance from the output shaft 4 to the drill 30 as compared to the case where the rotation shaft cores are arranged in a staggered manner. . Therefore, it is possible to provide an angle head that can easily cope with a deep working space.

The bevel gear portion 42a and the flat gear portion 42b of the rotary transmission 42 are arranged in a state where the bevel gear portion 42a is located on the opposite side of the flat gear portion 52b from the side on which the output shaft 4 is located. The flat gear portion 42b is positioned at a position that is as close as possible in the direction along the bevel gear shaft core 42d.
As in this configuration, in order to configure the rotary transmission body 42, the flat gear portion 52 b that is integrally attached to the bevel gear portion 42 a is attached to the bevel gear portion 42 a that meshes with the input bevel gear 41 of the output shaft 4. By providing on the side, the other spur gear connected to the spur gear portion 52b is juxtaposed at a position close to the output shaft 4. For this reason, the entire tip of the angle head is formed at a position close to the output shaft core, and the radial size of the entire angle head can be reduced.

  Further, in this configuration, since the bevel gear portion 42 a needs to receive a driving force from the input bevel gear 41, the outer diameter of the flat gear portion 52 b is inevitably in order to avoid interference with the input bevel gear 41. It becomes smaller than the outer diameter of the part 42a. When considering the outer size of the angle head, the size in the width direction perpendicular to the rotational axis of the drill 30 depends on the diameter of the large bevel gear portion 42a. Therefore, in order to insert the device into a hole as small as possible, it is preferable that the bevel gear portion 42a is close to the center position in the direction along the rotation axis of the drill 30 in the tip portion of the device. However, since the conical portion 32 of the drill 30 has a predetermined length, the position where the bevel gear portion 42a is provided is limited. In order to position the bevel gear portion 42a in the center of the apparatus, it is advantageous to bring it closer to the drill 30 side. Therefore, as in this configuration, by providing the flat gear portion 52b having a small outer diameter on the output shaft 4 side with respect to the bevel gear portion 42a, the shape of the tip portion of the angle head can be configured more compactly.

(Step part)
As shown in FIGS. 2 and 5, the tip end portion 11 of the drive case portion 13 of the head portion case 10 provided with the drill drive shaft 20 and the head body A on the side where the head body A is located. A step portion 16 is provided between the proximal end side portion 15 that is displaced. The stepped portion 16 has a bevel gear with respect to the flat gear portion 42b of the base end side portion 15 of the drive case portion 13 on the case outer surface 11a from which the end portion of the drill drive shaft 20 of the distal end portion 11 of the drive case portion 13 projects. The output shaft 4 is deviated to the side where the output shaft 4 is located with respect to the case outer surface 15a on the side where the portion 42a is located. The connecting portion 31 (see FIG. 6) located on the base end side of the drill 30 attached to the drill drive shaft 20 is located at a position that is as close as possible to the case inner side with respect to the case outer surface 15a in the base end side portion 15. The recessed portion 17 to be formed is formed on the outer surface side of the drive case portion 13 from which the drill drive shaft 20 protrudes.

  As shown in FIGS. 2 and 3, the case outer surface 16 a in the step portion 16 is configured as an inclined surface having a pair of inclined reflecting surfaces 16 b and 16 b.

The case outer surface 16a in the stepped portion 16 reflects the cutting powder scattered from the drill driving shaft 22 and the drill 30 attached to the drill driving shaft 22 and hitting one inclined reflecting surface 16b on one inclined reflecting surface 16b. And it reflects in the direction F1 (refer FIG. 3) which leaves | separates from the drill drive shaft 22 and the drill 30 by the effect | action of inclination. The outer surface 16a of the case scatters chips from the drill driving shaft 22 and the drill 30 attached to the drill driving shaft 22 and hits the other inclined reflecting surface 16b, and reflects and tilts the other inclined reflecting surface 16b. Is reflected in a direction F2 (see FIG. 3) away from the drill drive shaft 22 and the drill 30.
Therefore, the case outer surface 16a in the step portion 16 prevents the chips scattered from the drill drive shaft 20 and the drill 30 from dropping and adhering to the drill drive shaft 20 and the drill 30.

  As shown in FIGS. 2 and 4, the chamfered portion 18 and the drill drive shaft 22 are located at both corners of the drive case 13 in the head case 10 that are opposite to the side from which the drill drive shaft 20 protrudes. It is provided over the distal end portion 11 and the proximal end side portion 15 where the gear interlocking mechanism 50 is located. When the hole diameter of the workpiece is small, the chamfered portions 18 at both corners avoid the corner portion located behind the drill 30 of the drive case 13 from hitting the inner wall of the hole H of the workpiece. The tip side of the part B is easily inserted into the hole H.

  As shown in FIGS. 2 and 4, machining of the drive case 13 when drilling with a drill 30 has advanced in both corners of the drive case 13 in the head case 10 located on the side where the drill drive shaft 20 protrudes. A chamfer 18a is provided to avoid contact of the object with the inner wall of the hole.

  As shown in FIGS. 2 and 5, a recessed portion 19 that enlarges the heat radiation area of the tip end portion 11 is formed on the case outer surface 15 b of the head portion case 10 on the side opposite to the side from which the drill drive shaft 20 protrudes. Is located behind the support portion 13b for the drill drive shaft 20. Therefore, the temperature rise of the front end portion 11 in the head portion case 10 due to the rotation of the drill drive shaft 20 and the drilling of the drill 30 can be effectively suppressed.

  FIG. 6A is a cross-sectional view showing a state in which the drill 30 of the connecting means 60 for attaching the drill 30 to the drill drive shaft 20 is removed. FIG. 6B is a cross-sectional view showing a state where the drill 30 of the connecting means 60 is attached. As shown in these drawings, the connecting means 60 includes a drill mounting hole 21 and a connecting screw 61 provided in the drill drive shaft 20, and a connecting portion 31 provided at the base of the drill 30. .

  The drill mounting hole 21 is in a narrowed state in which the inner diameter becomes smaller toward the back side over the end surface 20b of the drill driving shaft 20 protruding outside the head case 10 and the back end set inside the drill driving shaft 20. It is formed and provided.

The connecting portion 31 of the drill 30 is formed in a taper shank. That is, the tip 31a located on the side opposite to the side connected to the conical portion 32 of the drill 30 is the tip in the direction of insertion into the drill mounting hole 21 of the drill drive shaft 20, and the outer diameter of the tip is closer to the tip. The taper is formed in a tapered state in which becomes smaller. The end of the connecting portion 31 on the drill 30 side is preferably formed thicker than the outer diameter of the drill 30. Thereby, the gripping force of the drill 30 can be increased. Further, the outer diameter of the other end of the connecting portion 31 is tapered. Thereby, while ensuring the area of the connection part 31 as wide as possible, it is comprised so that the wedge effect of both may be exhibited moderately at the time of the fastening of the drill attachment hole 21 and the connection part 31, and removal.
A female screw hole 33 is provided as a screw part 34 at the end of the connecting part 31 of the drill 30. The female screw hole 33 opens at the tip 31a in the direction of insertion into the drill mounting hole 21 of the connecting portion 31. In place of the female screw hole 33, a male screw may be protruded.

  The connecting screw 61 has a screw portion 62 positioned in the drill mounting hole 21 and an operation portion 63 positioned in the operation hole 23 provided at the end of the drill drive shaft 20 opposite to the side where the drill mounting hole 21 is positioned. In this state, the drill drive shaft 20 is rotatably supported. The connecting screw 61 does not necessarily have to be a male screw as shown in FIG. 6. If a male screw protrudes from the connecting portion 31 instead of the female screw hole 33, the connecting screw 61 is configured with a female screw that matches the male screw. You can also.

  As shown in FIG. 6B, the connecting portion 31 of the drill 30 is inserted into the drill mounting hole 21 of the drill drive shaft 20, and the tip of the screw shaft portion 61 of the connecting screw 61 is inserted into the female screw hole 33 of the connecting portion 31. When the operating portion 63 of the connecting screw 61 is rotated in the forward rotation direction, the end portion of the operating portion 63 located on the far side of the operating hole 23 comes into contact with the bottom surface of the operating hole 23, and the female screw is engaged. The screw shaft portion 62 that rotates by being screwed into the hole 33 pulls the connecting portion 31 toward the back side of the drill mounting hole 21 with the bottom surface of the operation hole 23 as a reaction point. At this time, the connecting screw 61 is fastened while holding the tool locking surface 20b formed at the opening end of the drill drive shaft 20 with a wrench or the like. When the outer peripheral surface of the connecting portion 31 is brought into pressure contact with the inner peripheral surface of the drill mounting hole 21, the connecting means 60 enters a connecting state, and the connecting portion 31 is connected to the drill drive shaft 20 by friction to drill the drill 30. The drive shaft 20 is connected to the drive shaft 20 so as to freely rotate.

When removing the drill 30 from the drill drive shaft 20, the connecting screw 61 is rotated several times counterclockwise, and the head of the connecting screw 61 is separated from the end of the drill mounting hole 21. In this state, the drill removing jig 80 shown in FIG. 10 is positioned and held at the tip of the head. The locking groove 82 formed in the front plate 81 of the removal jig 80 is engaged with the tool locking surface 20 b of the drill drive shaft 20, and the extrusion screw 84 screwed into the rear plate 83 is connected to the connection screw 61. Close to the edge. In this state, the extrusion screw 84 is screwed in, and the taper shank portion 31 is separated from the drill drive shaft 20 via the connection screw 61. Thereafter, the drill 30 is rotated and detached from the connection screw 61.
The connecting screw 61 is provided with a stopper 64 for preventing the removal. Therefore, even if the drill 30 is not attached, the connecting screw 61 does not fall out of the drill mounting hole 21.

[Another embodiment]
FIG. 7 is a longitudinal sectional front view showing the head part B according to the first alternative embodiment. In the head portion B, the ring body portion 42aR that meshes with the input bevel gear 41 in the bevel gear portion 42a that constitutes the rotary transmission body 42 is displaced to the side opposite to the side where the output shaft 4 is located with respect to the boss portion 42aT. Form. At the same time, the ring body portion 42bR meshing with the input flat gear 51 of the gear interlocking mechanism 50 in the flat gear portion 42b is displaced to the side opposite to the side where the output shaft 4 is located with respect to the boss portion 42bT, and the bevel gear The boss portion 42aT of the portion 42a is externally fitted.

  If it is this structure, the bearing which supports the bevel gear part 42a can be provided in the state which entered the recessed part of the boss | hub part 42aT. For this reason, the bearing also moves to the output shaft 4 side. Therefore, the plane on the side from which the drill 30 projects out of the surface of the head part case 10 can be retreated, and the head part case 10 can be configured to be thinner.

  FIG. 8 is a longitudinal front view showing a head portion B according to a second alternative embodiment. In the head portion B, the outer edge portion of the drill drive gear 22 provided on the drill drive shaft 20 is projected to the drill 30 side, and a recess 73 is formed in the drill drive gear 22. The support part 72 of the drill drive shaft 20 is provided in the recessed part 73.

  Thereby, in the said head part B, the case outer surface 11a of the site | part from which the edge part of the drill drive shaft 20 protrudes largely retracted with respect to the case outer surface 15a formed in the base end side of the drive case part 13. It becomes a shape. As a result of ensuring a large amount of displacement D in this way, it is possible to reduce the protruding length of the drill 30 from the case outer surface 15a while keeping the protruding length of the drill 30 from the case outer surface 11a the same. Therefore, it becomes easy to insert the head part B into the work space of the target product to be processed. Since the protruding length of the drill 30 from the case outer surface 11a does not change, a hole that effectively uses the length of the drill 30 can be drilled depending on the shape of the bottom of the work space.

FIG. 9 is a cross-sectional plan view showing the tip of the head case 10 according to the third alternative embodiment. In the head case 10, the outer diameter D1 of the bearing 74 provided on the side different from the drill 30 out of the two bearings supporting the drill drive shaft 20 is the outer diameter D2 of the bearing 75 provided on the drill 30 side. It is configured smaller.

  As a result, large chamfered portions 18 can be provided at both corners on the opposite side of the tip 30 of the head portion case from the drill 30. Therefore, even when the inner diameter of the hole of the workpiece is smaller, the tip portion 11 of the head case can be easily inserted.

[Another Example]
(1) In the above-described embodiment, an example in which the gear interlocking mechanism 50 is configured by including one transmission flat gear 53 is shown. However, instead of this, a gear that is configured by including two or more transmission flat gears 53 is provided. An interlocking mechanism may be adopted for implementation. Also in this case, the object of the present invention can be achieved.

  The present invention is not limited to an angle head used for machining in which a hole is drilled in a hole inner wall of a workpiece from the inside of the hole, but can also be used for an angle head used for machining in which a hole is drilled from the outer surface side of the workpiece. it can.

4 Output shaft 4a Output shaft core 10 Head portion case 11 Head portion case distal end portion 11a Tip portion case outer surface 15 Head portion case base end side portion 15a Base end side case outer surface 16 Step portion 16a Step portion Case outer surface 20 Drill drive shaft 20a Drill shaft core 21 Drill mounting hole 22 Drill drive gear 42 Rotating transmission element 42a Bevel gear portion 42b Flat gear portion 42d Bevel gear shaft core 50 Gear interlocking mechanism 51 Input flat gear 51b Input gear shaft core 52 Output flat Gear 52b Output gear shaft 53 Transmission spur gear 53b Transmission gear shaft 60 Connection means 61 Connection screw A Head body B Head portion L Straight line

Claims (3)

A head body mounted on a machine tool;
An output shaft provided in the head body so as to be rotatable around an output shaft core;
A drill drive shaft mounted with a drill and rotating about a drill axis perpendicular to the output axis;
A rotation interlocking mechanism that transmits the rotation of the output shaft to the drill drive shaft,
One of the drills is provided with a taper shank portion in which a screw portion is formed,
A drill driving gear for transmitting rotation from the rotation interlocking mechanism to the drill driving shaft; a tapered drill mounting hole into which the tapered shank portion can be inserted; and a through hole located at the bottom of the drill mounting hole; Is provided,
The connecting screw for fastening the drill is configured to be screwable with the threaded portion of the tapered shank portion through the through hole ,
The rotation interlocking mechanism is
An input bevel gear that rotates integrally with the output shaft;
A rotation transmission body having a bevel gear portion rotating around a bevel gear shaft orthogonal to the output shaft core while meshing with the input bevel gear, and a flat gear portion rotating integrally with the bevel gear portion coaxially;
An input spur gear that meshes with the spur gear portion and rotates about an input gear shaft core parallel to the bevel gear shaft core;
An output spur gear that rotates about an output gear axis parallel to the bevel gear axis;
A transmission spur gear that interlocks the input spur gear and the output spur gear and rotates about a transmission gear shaft core parallel to the bevel gear shaft core;
The bevel gear shaft core, the input gear shaft core, the transmission gear shaft core, the output gear shaft core, and the drill shaft core are juxtaposed along a straight line parallel to the output shaft core,
The angle head which has arrange | positioned the said bevel gear part on the opposite side to the side in which the said output shaft is located with respect to the said flat gear part . Of the surface forming the distal end portion of the head portion case that houses the rotation interlocking mechanism and the drill drive gear, the plane including the protruding position of the drill is on the proximal end side of the head portion case with respect to the plane. angle head according to claim 1 that has a step portion retired than adjacent surfaces. At the boundary position between the stepped portion and the surface adjacent to the base end side of the head case with respect to the stepped portion, an inclined surface is formed that scatters chips scattered from the drill in a direction away from the drill. The angle head according to claim 2.

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