JPH0347761Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention provides first and second outer shafts that are generally cylindrical, and first and second outer shafts that are slidably fitted in the axial direction within the outer shafts. This invention relates to a device that connects and separates inner shafts at the same time.

BACKGROUND OF THE INVENTION It is necessary for a mechanical device to include an outer shaft and an inner shaft slidably fitted in the outer shaft in the axial direction, and to be able to simultaneously separate the outer shaft and the inner shaft into two parts. There is something. For example, in a machine tool in which separate cutting tools are attached to the outer and inner shafts, and the outer and inner shafts are machined by applying motion that involves relative movement in the axial direction, the outer and inner shafts are This is the case when the tool is divided into two parts and only the parts that hold the respective cutting tools are removed from the main body of the device. At this time, the first outer shaft and the second outer shaft are divided into two by only the relative movement necessary for the inner and outer shafts to perform their original functions, and the first inner shaft and If the second inner shaft can be connected and separated at the same time, it is not necessary to give the outer and inner shafts a motion other than their axial movement, or to provide a dedicated actuator for connection and separation. It's very convenient.

However, such a connecting device is not yet known, and conventionally, when connecting the outer shaft and the inner shaft divided into two as described above, the same method is used when connecting a single shaft. Connecting devices such as threaded joints or bayonet joints were used.

Problems that the invention aims to solve: Therefore, when connecting and separating the outer and inner shafts, it is necessary to rotate each of the outer and inner shafts, which are divided into two, relative to each other. The outer and inner shafts must perform operations other than relative movement in the axial direction, and if the outer and inner shafts cannot rotate relative to each other, each shaft cannot rotate independently. There was a problem that made it even more difficult to connect and separate.

Means for Solving the Problems The two-shaft simultaneous connection/separation device according to the present invention solves the above-mentioned problems by (a) a first cylindrical part extending concentrically from the other end with an outer diameter smaller than that of the first cylindrical part, and a first fitting hole formed at the other end with an inner diameter capable of fitting with the first cylindrical part; (b) either one of the first and second inner shafts has the same outer diameter as that one, and
A second cylindrical part provided with a second fitting hole in the center and a fitting protrusion provided on the other side with an outer diameter that can be fitted into the second cylindrical part. a fitting part;
(c) a first through hole and a second through hole formed in the first cylindrical part and the second cylindrical part, respectively, with a diameter larger than the wall thickness of the first cylindrical part and penetrating the second cylindrical part in the radial direction; They are arranged in the first through hole and the second through hole, respectively, with a diameter larger than the wall thickness of the first cylindrical part and the second cylindrical part, and are always formed on the outer circumferential surface of either one of the inner shafts and both the inner shafts. (e) a first ball and a second ball that are supported by the inner circumferential surface of either one of the outer shafts and partially protrude from the outer circumferential surface of the first cylindrical part and the inner circumferential surface of the second cylindrical part; a first recess formed on the inner circumferential surface of the first fitting hole and connecting the two outer shafts by engaging with a portion protruding from the outer circumferential surface of the first cylindrical portion of the first ball; and a second cylindrical portion. a second recess that connects both inner shafts by engaging with a portion of the second ball that is formed on the outer circumferential surface of the fitting protrusion and that protrudes from the inner circumferential surface of the second cylindrical portion; f) A third recess formed in the inner circumferential surface of the inner shaft on the same side as the inner shaft where the second through hole is formed, and the outer shaft where the first through hole is formed between the two inner shafts. and a fourth recess formed on the outer circumferential surface of the shaft located on the same side as the shaft, and the third recess is caused to penetrate through the second by relatively moving the outer shaft and the inner shaft in the connected state in the axial direction. The positions of the third recess and the fourth recess are determined so that the fourth recess faces the first through hole when facing the hole, and the sizes of the third recess and the fourth recess are determined. The second ball and the first ball move toward the respective recesses so that they are not engaged with the second recess and the first recess, respectively, so that both the inner shaft and both the outer shaft can be separated at the same time. It is determined.

Effect When separating the first and second outer shafts and the first and second inner shafts connected by the two-shaft simultaneous connection/separation device configured as above, the outer shaft and the inner shaft are moved relative to each other in the axial direction so that the third recess and the second through hole, as well as the fourth recess and the first through hole, face each other, and then the same side of both the outer shaft and the inner shaft is moved. If the two balls are moved together in a direction away from the outer and inner shafts on the other side, the first ball and the second ball are moved to the fourth and third recesses, respectively, and are moved to the first recess. Then, the second recess is not engaged with the outer shaft and the inner shaft are separated from each other.

In addition, when connecting both outer shafts and both inner shafts, the outer shaft and inner shaft on the same side are moved together in the axial direction, and the first cylindrical part is inserted into the first fitting hole.
Further, after fitting the fitting protrusions into the second fitting holes so that the first recess and the first through hole are facing each other, and the second recess and the second through hole are facing each other, When the shaft and the inner shaft are moved relative to each other in the axial direction, the first ball and the second ball are engaged with the first recess and the second recess, respectively, and both the outer shaft and both the inner shaft are connected simultaneously. That will happen.

Effects of the invention As described above, according to the two-shaft simultaneous connection/separation device according to the invention, the outer shaft and the inner shaft are moved relative to each other in the axial direction, and the first and second outer shafts and the first and second By moving the inner shafts on the same side together in the axial direction, both the outer and inner shafts can be connected and separated at the same time. There is no need to perform any operation other than movement of the
Separation operations can be performed, and there is no need to provide a dedicated actuator or the like to connect and separate the outer shaft and inner shaft. Furthermore, since there is no need to rotate the outer and inner shafts, even if the outer and inner shafts cannot rotate relative to each other, the device according to the present invention can be used to divide each shaft into two and connect and connect them. Separation can be easily performed.

Embodiments Hereinafter, a case in which the present invention is applied to an apparatus for processing a valve seat in a cylinder head of an engine will be explained in detail based on the drawings.

In FIG. 8, reference numeral 10 denotes a hollow main shaft, which is rotatably supported by a cylindrical support member 14 fixed on the slide 12 via a plurality of bearings 16, but not relatively movable in the axial direction. A pulley 18 is attached to the rear end of the main shaft 10 protruding from the support member 14, and a belt 24 is wound around this pulley 18 and a pulley 22 fixed to the output shaft of the spindle motor 20, so that the motor 20 allows the main shaft 10 to be rotated. In other words, these pulleys 1
8, a spindle motor 20, a pulley 22, a belt 24, etc. constitute a rotational drive device that rotates the main shaft 10.

Further, the slide 12 is placed on a guide table 28 provided on a base 26 so as to be movable in a direction parallel to the axis of the main shaft 10, and is rotatably and movably in the axial direction by a bracket 30 below the slide 12. A numerically controllable electric motor (hereinafter referred to as an NC motor) 3 is attached to the nut 32 that is fixedly attached.
A feed screw 36 rotationally driven by the feed screw 36 is screwed together, and as the slide 12 is moved on the guide table 28 by the rotation of the feed screw 36, the main shaft 10 is fed in the axial direction. ing.
That is, the slide 12, the guide stand 28, the nut 3
2. A main shaft feeding device that moves the main shaft 10 in the axial direction is constituted by an electric motor 34, a feed screw 36, and the like.

Inside the hollow of the main shaft 10, as shown in FIG.
A cylindrical push rod 38 and a clamp shaft 40 are fitted in order from the rear end of the main shaft 10 so as to be non-rotatable and movable in the axial direction. As shown in FIG. 8, the push rod 38 is moved forward, that is, toward the tip of the main shaft, by supplying hydraulic pressure to a hydraulic chamber 41 formed at the rear thereof. The clamp shaft 40 also has a compression coil spring 48 disposed between a spring receiver 44 attached to the rear end with a nut 42 and an inward flange 46 formed on the inner peripheral surface of the main shaft 10. is always biased toward the rear end of the main shaft and brought into contact with the end surface of the push rod 38 on the front end side of the main shaft.As the push rod 38 is advanced, the main shaft is pushed against the urging force of the spring 48. While being moved to the tip side, if the supply of hydraulic pressure to the hydraulic chamber 41 is cut off, the push rod 38 is pushed back toward the rear end of the main shaft by the biasing force of the spring 48, and the push rod 38 is moved backward. There is.

A portion of the clamp shaft 40 on the main shaft distal end side has a large diameter, and this large diameter portion 50 is fitted into a large diameter hole 52 formed at the distal end of the main shaft 10.
A steel ball 56 is movable in the radial direction of the clamp shaft 40 in a plurality of tapered through holes 54 formed at equal angular intervals, but is fitted into the center of the clamp shaft 40 without being able to come out. .

A hollow sliding shaft 58 as a first outer shaft is fitted into the clamp shaft 40 so as to be non-rotatable relative to the main shaft 10 and movable in the axial direction. A sliding intermediate shaft 60 serving as the second outer shaft is disposed so as to be non-rotatable and movable relative to each other in the axial direction. A first cylindrical portion 62 with a small diameter is formed on the end surface of the sliding shaft 58 on the rear end side of the main shaft, whereas the sliding intermediate shaft 60 has an outer diameter equal to the outer diameter of the sliding shaft 58. , and a first fitting hole 63 having an inner diameter that can be fitted with the small diameter portion 62 is formed at the end on the tip side of the main shaft. The first fitting portion is constituted by. A plurality of first through holes 64 are formed in the first cylindrical portion 62 at equal angular intervals and have a diameter larger than the wall thickness of the first cylindrical portion 62 and pass through it in the radial direction. As shown in FIG. 7, steel balls 66 as first balls each have a diameter larger than the wall thickness of the first cylindrical portion 62.
The retaining ring 68 prevents the sliding shaft 58 from falling off toward the outer circumference, and the tapered portion formed at the open end prevents the sliding shaft 58 from falling off toward the inner circumference, so that the sliding shaft 58 is movably fitted. are combined. On the other hand, an annular groove 70 with a triangular cross section as a first recess is formed in the inner circumferential surface of the first fitting hole 63, and the first cylindrical portion 62 is fitted into the first fitting hole 63 and slides. Moving axis 58
When the stepped surface and the tip end surface of the sliding intermediate shaft 60 are in contact with each other, the first through hole 64 and the annular groove 70 face each other, and the sliding shaft 58 and the sliding intermediate shaft 60 can be connected. It is made to be in a state.

Further, an annular groove 80 having a triangular cross section is provided on the outer circumferential surface of the main shaft tip end of the sliding shaft 58, and a movable ring 82 extending radially outward and obliquely forward from the sliding shaft 58 is fixed. ing.

A cylindrical member 84 as shown in FIG. 8 is screwed into a female screw hole 83 formed at the end of the sliding intermediate shaft 60 on the rear end side of the main shaft. Another cylindrical member 86 is fixed to the member 84, and the member 86 is rotatable and axially movable at the lower end of a movable member 90 to which a nut 88 is attached non-rotatably and relatively immovably in the axial direction. Retained with relative immovability. The nut 88 has the slide 12
A feed screw 94 that is rotationally driven by an electric motor 92 placed above is screwed together.
4 is rotated, the moving member 90 is moved, and the sliding intermediate shaft 60 and the sliding shaft 58 are moved in the axial direction via the members 84 and 86. That is, the member 8
4, 86, a nut 88, a moving member 90, an electric motor 92, a feed screw 94, etc. constitute a sliding shaft feeding device that moves the sliding shaft 58 in the axial direction.

The electric motor 92 is a numerically controllable motor (MC motor) like the NC motor 34, and the device controllers for these motors 34, 92 are appropriately controlled to set the motors 34, 92 as desired. Therefore, the main shaft 10 and the sliding shaft 58 can be simultaneously moved at any speed and in any direction.

As shown in FIG. 1, a cylindrical cutting tool main body 96 is attached to the tip of the main shaft 10 so as to be immovable relative to each other and immovable in the axial direction. This main body 96
is engaged with a key 98 fixed to the tip of the main shaft to prevent relative rotation, while its rear end is fitted into a large diameter portion 50 formed at the tip of the clamp shaft 40. By engaging the steel ball 56 held by the large diameter portion 50 with the inclined surface on the tip side of the main shaft of the annular projection 100 with a trapezoidal cross section formed at the end, the main body 96 is attached to the clamp shaft 40.
The main shaft 1 is compressed by the compression coil spring 48 via the
0 and is held relatively immovable in the axial direction. A bottle neck 102 is formed in the axially intermediate portion of the main body 96, and the bottle neck 102 comes into contact with the distal end surface of the main shaft 10, thereby regulating the retraction of the main body 96 into the main shaft 10. Further, a portion of the sliding shaft 58 on the main shaft tip side is fitted inside the main body 96 so as to be relatively movable in the axial direction, and a cup-shaped screw member is provided in the portion of the main body 96 facing the sliding shaft 58. 104 are screwed together. A ball 106 and a spring 108 are housed in the screw member 104, and the ball 10
6 is urged toward the sliding shaft 58 by a spring 108.

The protruding portion of the cutting tool body 96 from the main shaft 10 has a conical shape, and a traverse slider 112 holding a cutting tool 110 is attached to this portion. The traverse slider 112 is mounted so as to be slidable in a direction inclined at an angle α with respect to the axis of the main shaft 10, and a through hole 114 formed at right angles to the longitudinal direction at approximately the middle part of the traverse slider 112 is provided with the sliding shaft. The protruding end of the movable ring 22 fixed to the tip of the movable ring 58 is slidably fitted, and the movable ring 8
2 serves as a key to prevent relative rotation between the sliding shaft 58 and the main body 96, and also a slope formed between the movable ring 82 and the through hole 114 when the sliding shaft 58 is moved. Due to the action of
The traverse slider 112 is moved along a sliding surface 116 formed on the main body 96. That is, in this embodiment, the movable ring 82 functions as a motion conversion mechanism that converts the axial movement of the sliding shaft 58 into the sliding motion of the dry drive slider 112, and as described above, the moving ring 82 functions as a motion conversion mechanism that converts the axial movement of the sliding shaft 58 into the sliding motion of the dry drive slider 112. , 92, the cutting tool 110 can be moved in any direction in a plane including the mutually orthogonal X and Y axes as the traverse slider 112 slides.

Furthermore, within the sliding shaft 58, a reamer shaft 118 as a first inner shaft and a reamer intermediate shaft 120 as a second inner shaft are arranged in order from the main shaft tip side by a key 122 so that they cannot be rotated relative to each other and can be moved relative to each other in the axial direction. is mated to. At the end of the main shaft rear end of the reamer shaft 118, there is a second cylindrical portion 126 having an outer diameter equal to the outer diameter of the reamer shaft 118 and having a second fitting hole 124 in the center.
On the other hand, the reamer intermediate shaft 120 has an outer diameter equal to the outer diameter of the reamer shaft 118, and has a fitting fitting provided at the end on the leading end side of the main shaft with an outer diameter that can be fitted into the second cylindrical portion 126. A protrusion 128 is formed, and the second cylindrical part 126 and the fitting protrusion 128 constitute a second fitting part. Second cylindrical part 1
Similar to the first cylindrical portion 62, a plurality of second through holes 130 are formed at equal angular intervals through the first cylindrical portion 62 in a radial direction and have a diameter larger than the wall thickness of the first cylindrical portion 62. 130 includes a second cylindrical portion 1
A steel ball 132 serving as a second ball having a diameter larger than the wall thickness of the second ball 26 is fitted into the ball 132 by retaining rings and tapered portions (both not shown) provided at both open ends so that they cannot fall out. Further, an annular groove 134 with a triangular cross section is formed as a second recess on the outer peripheral surface of the fitting protrusion 128.
When the second cylindrical portion 126 is fitted into the fitting protrusion 128, the rear end surface of the reamer shaft 118 contacts the shoulder surface of the reamer intermediate shaft 120, and the second through hole 130 faces the annular groove 134. The reamer shaft 118 and the intermediate reamer shaft 120 can be connected to each other.

From this state, the reamer shaft 118 and the reamer intermediate shaft 120 are inserted into the sliding shaft 58 and the sliding intermediate shaft 60 from the reamer intermediate shaft 120 side, that is, the sliding shaft 58 and the reamer shaft 118 are both located on the main shaft tip side. , sliding intermediate shaft 60 and reamer intermediate shaft 1
20 are both located on the rear end side of the main shaft,
Fit together. As a result, the steel ball 66 held by the first cylindrical portion 62 is supported by the outer circumferential surface of the reamer intermediate shaft 120 and a portion thereof protrudes from the outer circumferential surface of the first cylindrical portion 62. Along with being
The protruding portion enters into and engages with the annular groove 70, thereby connecting the sliding shaft 58 and the sliding intermediate shaft 60. At the same time, the steel ball 132 held by the second cylindrical part 126 is supported by the inner peripheral surface of the sliding shaft 58 and
The reamer shaft 118 and the intermediate reamer shaft 120 are connected by projecting from the inner circumferential surface of the reamer shaft 118 and the reamer intermediate shaft 120 by entering the annular groove 134 and engaging the projecting portion.

In this way, the sliding shaft 58 and the sliding intermediate shaft 60, and the reamer shaft 118 and the reamer intermediate shaft 120 are connected by the engagement of the steel balls 66, 132 and the annular grooves 70, 134, respectively. The moving shaft 58, the reamer shaft 118, and the cutting tool main body 96 are connected to each other by uncoupling the sliding shaft 58 and the sliding intermediate shaft 60 and the reaming shaft 118 and the reaming intermediate shaft 120, respectively, as will be described in detail later. As shown in FIGS. 5 and 6, it can be removed integrally from the main shaft 10.

The reamer shaft 118 is moved axially by a hydraulic cylinder 136 shown in FIG. A hydraulic cylinder 136 is mounted on the slide 12, and its piston rod 138 is connected to the member 8.
4 and 86 and inserted into the main shaft 10, and its distal end is screwed into a female threaded hole 140 formed in the reamer intermediate shaft 120. When the piston rod 138 expands and contracts, the reamer shaft 118 is moved in the axial direction, and the reamer (not shown) attached to the reamer shaft 118 is guided by the guide bush 142 fixed to the cutting tool body 96. When the reamer shaft 118 is rotated, the piston rod 138 can rotate together.

Furthermore, a steel ball 6 is provided on the inner peripheral surface of the sliding shaft 58.
An annular groove 144 with a triangular cross section is formed at a position a short distance away from the portion holding the main shaft 6 toward the tip side of the main shaft. As mentioned above, the sliding shaft 58 and the reamer shaft 11
Since it is located on the same side as 8, this annular groove 1
44 is a reamer shaft 1 in which a second through hole 130 is formed.
It is formed in the sliding shaft 58 located on the same side as the third recess 18 and functions as a third recess. Sliding shaft 58
A threaded member 146 similar to the threaded member 104 is threaded through the sliding shaft 58 in the radial direction to a part further toward the tip of the main shaft than the part where the annular groove 144 is formed. The ball 148 housed therein is urged toward the center of the sliding shaft 58 by a spring 150.

Further, an annular groove 152 having a triangular cross section is formed on the outer peripheral surface of the second cylindrical portion 126 of the reamer shaft 118 at a portion closer to the rear end of the main shaft than the portion holding the steel ball 132. This annular groove 152 is formed by the first through hole 6
4 is formed in the reamer shaft 118, which is the inner shaft located on the same side as the sliding shaft 58, which is the outer shaft, and functions as a fourth recess. An annular groove 154 with a triangular cross section is formed in the tip end side of the main shaft.

The annular groove 152 is connected to the steel ball 13 of the reamer shaft 118.
2 is held at a position equal to the distance between the annular groove 144 formed on the inner peripheral surface of the sliding shaft 58 and the steel ball 66 held by the sliding shaft 58. The annular groove 154 is connected to the steel ball 13.
2 is the distance from the annular groove 144 to the threaded member 14.
It is formed at a position equal to the distance from 6.
That is, the annular groove 1 provided in the reamer shaft 118
52, steel ball 132, annular groove 154, and sliding shaft 58
The steel ball 66, annular groove 144, and screw member 146 provided in When the intermediate shaft 60, the reamer shaft 118, and the reamer intermediate shaft 120 are relatively moved in the axial direction so that the annular groove 144 faces the second through hole 130, the annular groove 152
will face the first through hole 64. Also,
The sizes of these annular grooves 144 and 152 are such that when the steel balls 66 and 132 fitted into the first through hole 64 and the second through hole 130 move into the first through hole 64 and the second through hole 130, respectively, do not engage with the annular grooves 70 and 134, respectively, and the sliding shaft 58, the sliding intermediate shaft 60, and the reamer shaft 118
and reamer intermediate shaft 120 are determined to be separable.

When the processing device configured as described above is not in operation, both the sliding shaft 58 and the reamer shaft 118 return to their original positions as shown in FIG. 80 is the cutting tool body 96
The annular groove 154 formed on the outer circumferential surface of the reamer shaft 118 is located a short distance closer to the tip of the main shaft than the threaded member 104 threaded onto the sliding shaft 58 , and the annular groove 154 is located a certain distance closer to the main shaft tip than the threaded member 146 threaded onto the sliding shaft 58 . It is located on the tip side.

After the main spindle 10 is advanced by the main spindle feeding device and the cutting tool main body 96 is brought close to the cylinder head to a predetermined position, the spindle motor 20 and the NC motor 9 are started, and the main spindle 10 is rotated. At the same time, the sliding shaft 58 is advanced and the tapered surface as a valve seat is processed by the cutting tool 110, and then the reamer shaft 11
8 is advanced to perform finishing machining of the valve stem hole. At this time, by simultaneously moving the main shaft 10 and the sliding shaft 58 at appropriate speeds in appropriate directions, a tapered surface with an arbitrary inclination angle can be formed.

When machining is completed, first, as shown in FIG. 2, the reamer shaft 118 is retreated to the position before machining. In this position, the annular groove 144 formed on the inner circumferential surface of the sliding shaft 58 and the annular groove 152 formed on the outer circumferential surface of the reamer shaft 118 face each other, and from this state the sliding shaft 58 is When the slide shaft 58 and the reamer shaft 118 are moved back to the original position shown in FIG.

When removing the sliding shaft 58, cutting tool body 96, and reamer shaft 118 from the main shaft 10, the sliding shaft 58 is screwed into the annular groove 80 as shown in FIG. 4 from the state shown in FIG. If the reamer shaft 118 is moved until the ball 106 of the member 104 is fitted into the annular groove 154 and the ball 148 of the screw member 146 is fitted into the annular groove 154, the reamer shaft 118 is moved until the ball 148 of the screw member 146 is fitted into the annular groove 154. Screw member 14
6, annular groove 144, steel ball 66, and reamer shaft 118
The annular groove 154 provided on the side, the steel ball 132, and the annular groove 152 are formed at corresponding intervals, so that the ball 148 is in the annular groove 154.
At the same time, the steel balls 66 and 132 fit into the annular grooves 152 and 144, respectively, or face each other. From this state, the sliding intermediate shaft 6
0 and reamer intermediate shaft 120, the steel balls 66, 1 that were facing the annular grooves 152, 144 are removed.
32 are pressed by the inner circumferential surface of the sliding intermediate shaft 60 and the outer circumferential surface of the reamer intermediate shaft 120 to form the annular groove 15.
2, 144, and the connection between the sliding shaft 58 and the sliding intermediate shaft 60 and the connection between the reamer shaft 118 and the reamer intermediate shaft 120 are respectively released. Subsequently, hydraulic pressure is supplied to the hydraulic chamber 41 to move the push rod 38 forward, and the clamp shaft 4 is moved forward.
0 is moved forward against the biasing force of the compression coil spring 48 to disengage the ball 56 from the annular protrusion 100 of the cutting tool body 96 and bring it into contact with the cutting tool body 96. and spindle 1
The tight fitting with 0 is released, and the bottle neck 102
The cutting tool main body 96 can be removed by an operator by hand or by a robot or the like. The cutting tool main body 96, sliding shaft 58, and reamer shaft 118 are engaged by the engagement between the ball 106 and the annular groove 80 and the engagement between the ball 148 and the annular groove 154, respectively, so that they are integrally formed. It will be removed from the main shaft 10.

In addition, when attaching the cutting tool body 96, sliding shaft 58, and reamer shaft 118 to the main shaft 10, first, hydraulic pressure is supplied to the hydraulic chamber 41, and the clamp shaft 40 is
Advance the cutting tool body 96 to the same extent as when removing it, and then move the main shaft 1 from the rear end side of the sliding shaft 58.
At this time, the notch formed in the bottle neck 102 of the cutting tool main body 96 is engaged with the key 98, and the sliding shaft 58 is inserted so that the bottle neck 102 of the cutting tool main body 96 is inserted into the tip surface of the main shaft 10. When the hydraulic pressure is cut off to the hydraulic chamber 41 after the clamp shaft 40 is inserted until it comes into contact with the clamp shaft 40, the clamp shaft 40 is retracted by the biasing force of the spring 48, and the ball 56 is engaged with the annular protrusion 100. The cutting tool main body 96 is drawn into the main shaft 10 by the spring 48 and is held immovably in the axial direction. Subsequently, the sliding intermediate shaft 60 and the reamer intermediate shaft 120 are connected to the sliding shaft 58 and the reamer shaft 1, respectively.
18, the first through hole 6
4. The second through hole 130 is connected to the annular groove 70, 1, respectively.
34, and from this state, if the sliding intermediate shaft 60 and the reamer intermediate shaft 120 are simultaneously moved and the sliding shaft 58 and the reamer shaft 118 are returned to their original positions shown in FIG.
Since the amount of movement is larger than the amount of movement of the sliding shaft 58, both shafts 58, 118 are moved relative to each other, and the steel balls 66, 132 are moved toward the annular grooves 70, 134, and the sliding shaft 58 and sliding intermediate shaft 6
0, the reamer shaft 118 and the reamer intermediate shaft 120 are connected simultaneously and attached to the main shaft 10.

In this way, in this embodiment, the sliding shaft 58,
By appropriately moving the sliding intermediate shaft 60, reamer shaft 118, and reamer intermediate shaft 120 in the axial direction, the sliding shaft 58 and the sliding joint 60, and the reamer shaft 118 and the reamer intermediate shaft 120 are simultaneously separated and connected. This separation,
The connection is a sliding shaft 58 for processing the valve seat.
The operation is easy because it is performed by utilizing the axial movement that should originally be applied to the reamer shaft 118, etc.
There is no need to provide a dedicated actuator or the like. In addition,
As is clear from the above description, when attaching and removing the sliding shaft 58, reamer shaft 118, and cutting tool main body 96 to the main spindle 10, the operator
6 and inserting or pulling it out of the main shaft 10, there is no need to touch the sliding shaft 58, reamer shaft 118, etc. However, as in this embodiment, each shaft 58, 118 is hollow. 10 and cannot be accessed from the outside, it is effective to be able to attach and detach it in this way.

Although one embodiment of the present invention has been described in detail above, this is literally an example, and each part can be modified and improved based on the knowledge of those skilled in the art.

For example, in the embodiment described above, the annular groove 144 as the third recess is formed by the steel ball 6 on the inner peripheral surface of the sliding shaft 58.
An annular groove 15 serving as a fourth recess is provided at a position a small distance away from the part holding the main shaft toward the tip end of the main shaft.
2 was provided at a position closer to the rear end of the main shaft than the part of the second cylindrical part 126 that held the steel ball 132,
As shown in FIG. 9, an annular groove 1 as a third recess
56 is provided in a part of the first cylindrical part 62 that is closer to the rear end of the main shaft than the part that holds the steel ball 66, and an annular groove 158 as a fourth recess is provided in a part of the second cylindrical part 126 that holds the steel ball 132.
It may be provided in a portion closer to the tip of the spindle than the portion holding the.

In addition, as shown in FIG. 10, the reamer intermediate shaft 1
A second cylindrical part 160 having an outer diameter equal to the outer diameter of the reamer shaft 20 and a second fitting hole 159 in the center is provided at the distal end of the reamer shaft 118 , and a second cylindrical part 160 is provided at the rear end of the reamer shaft 118 . A fitting protrusion 162 that can be fitted to the portion 160 may be provided. In this case, the annular groove 1 as the second recess
64 is provided on the fitting protrusion 162, and the steel ball 132 is fitted into the second through hole 166 formed in the second cylindrical portion 160, and the second through hole 166 forms an annular groove 168 as a third recess. A sliding intermediate shaft 60 located on the same side as the reamer intermediate shaft 120, which is the inner shaft
The sliding shaft 58 and the reamer shaft 1
18 is removed from the main shaft 10, the steel ball 13
2 will remain in the main shaft 10.

Furthermore, in the above embodiment, the cutting tool body 96
was drawn into the main shaft 10 by a compression coil spring 48 via a clamp shaft 40 and held relatively immovably in the axial direction, but the clamp shaft 40, compression coil spring 48, and push rod 38 are omitted, and the Figure 11 or 1st
As shown in FIG. 3, it may be held by a pair of clamp rods 170 fitted to the main shaft 10 so as to be movable in a direction perpendicular to its axis. These clamp rods 170 are fitted with a portion thereof protruding from the inner circumferential surface of the main shaft 10, and a groove 172 extending in the axial direction is formed in the portion opposite to this protruding side. The tip of a pin 174 press-fitted into the main shaft 10 is fitted into the groove 172, and these pins 174 and the groove 172
The engagement prevents the clamp rod 170 from rotating and defines the amount of axial movement. Among the parts of the clamp rod 170 that protrude from the inner peripheral surface of the main shaft 10, the pin 17
An escape groove 176 that draws an arc equal to the arc of the outer peripheral surface of the cutting tool body 96 is formed in a portion that faces the cutting tool body 96 when the groove 4 is fitted into one end of the groove 172.

In addition, the bottle neck 102 of the cutting tool body 96
The portion that faces the clamp rod 170 when the rod is inserted until it contacts the main shaft 10 includes:
As is clear from FIG. 11, an annular groove 1 with a trapezoidal cross section
77 is formed, and when the cutting tool main body 96 is attached to the main groove 10, the clamp rod 170 is attached to the escape shaft 176 as shown in FIG.
The part where the annular groove 177 is not formed is in pressure contact with the groove side surface of the rear end of the main shaft, and the friction force generated between the two prevents the clamp rod 170 from moving, and the cutting tool body 96 is axially relative to the main shaft 10. It will be held immovable.

When the cutting tool main body 96 is removed from the main shaft 10, one of the pair of sills 178, 180 disposed on both sides of the main shaft 10 so as to be movable along the axis of the clamp rod 170, is removed from the relief groove 170 of the clamp rod 170. The clamp rod 170 is moved until the pin 174 engages with the other end of the groove 172 by actuating the cylinder 178 disposed on the side where the groove 172 is formed.
70 is disengaged from the cutting tool body 96, and the relief groove 176 comes to face the cutting tool body 96 as shown in FIG. 13. Therefore, by moving the cutting tool body 96 in the axial direction, It can be removed from the main shaft 10. When attaching the main body 96 to the main shaft 10, the other cylinder 180 is operated to move the clamp rod 170 until the pin 174 engages with the other end of the groove 172. The protrusion from the inner circumferential surface is engaged with the annular groove 177, so that the cutting tool main body 96 is attached to the main shaft 10 so as not to be able to move in the axial direction.

Although other examples will not be given in detail, the connection/separation device according to the present invention connects the sliding shaft 58 and the reamer shaft 118 to the sliding intermediate shaft 60 and the reamer intermediate shaft 120 in a device for forming valve seats in the cylinder head of an engine. A device equipped with first and second outer shafts and first and second inner shafts slidably fitted inside the first and second outer shafts, not only when connecting and separating them, but also in other processing equipment, etc. If so, it can be implemented in various ways, such as being able to be used to connect and separate both outer shafts and inner shafts at the same time.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing the main parts of a valve seat processing apparatus equipped with a two-shaft simultaneous connection/separation device, which is an embodiment of the present invention. Figures 2 to 4 show the cutting tool body, sliding shaft,
FIG. 6 is a front sectional view illustrating a process of removing the reamer shaft from the main shaft. FIG. 5 is a front sectional view showing the cutting tool body, sliding shaft, and reamer shaft removed from the main shaft, and FIG. 6 is a front sectional view showing the main shaft from which these have been removed. FIG. 7 is a front sectional view showing a state in which the sliding shaft and the sliding intermediate shaft are connected by fitting a steel ball into an annular groove. FIG. 8 is a front view showing the entire processing apparatus, partially in section. FIG. 9 is a front sectional view showing the main part of another embodiment of the present invention, and FIG. 10 is a front sectional view showing the main part of still another embodiment. FIG. 11 is a side sectional view showing another mode of attachment of the cutting tool body constituting the processing device to the main shaft. FIG. 12 is a front view showing the state in which the cutting tool body shown in FIG. 11 is engaged with the clamp rod, and FIG. 13 is a front view showing the state in which the cutting tool main body shown in FIG. 11 is disengaged. 10...Main shaft, 58...Sliding shaft (first outer shaft),
60... Sliding intermediate shaft (second outer shaft), 62... First cylindrical part (first fitting part), 63... First fitting hole,
64...First through hole, 66... Steel ball (first ball), 70... Annular groove (first recess), 118... Reamer shaft (first inner shaft), 120... Reamer intermediate shaft ( second inner shaft), 124... second fitting hole (second fitting part), 126... second cylindrical part, 128... fitting protrusion, 130... second through hole, 132... ... Steel ball (second ball), 134 ... Annular groove (second recess), 14
4... annular groove (third recess), 152... annular groove (fourth recess), 156... annular groove (third recess), 1
58... Annular groove (fourth recess), 159... Second fitting hole, 160... Second cylindrical part, 162... Fitting protrusion, 164... Annular groove (second recess), 166... …
Second through hole, 168... annular groove (third recess).

Claims (1)

[Claims for Utility Model Registration] First and second inner shafts are connected to first and second outer shafts that are generally cylindrical in shape, and at the same time are fitted into the outer shafts so as to be slidable in the axial direction. a first cylindrical part concentrically extending from an end surface of one of the two outer shafts with an outer diameter smaller than that of the other end; a first fitting portion consisting of a cylindrical portion and a first fitting hole formed with an inner diameter capable of fitting; and one of the two inner shafts having the same outer diameter as the other. , and a second cylindrical part provided with a second fitting hole in the center, and a fitting protrusion provided on the other side with an outer diameter capable of fitting into the second cylindrical part. a first through hole and a second through hole formed in the first cylindrical part and the second cylindrical part, respectively, with a diameter larger than the wall thickness of the first cylindrical part and penetrating them in the radial direction. and, each having a diameter larger than the wall thickness of the first cylindrical part and the second cylindrical part, and disposed in the first through hole and the second through hole, and always having a diameter larger than the wall thickness of the first cylindrical part and the second cylindrical part. and a second ball that is supported by the outer peripheral surface of the outer shaft and the inner peripheral surface of either one of the outer shafts and partially protrudes from the outer peripheral surface of the first cylindrical part and the inner peripheral surface of the second cylindrical part. a second ball that connects the two outer shafts by engaging with a portion formed on the inner peripheral surface of the first fitting hole and protruding from the outer peripheral surface of the first cylindrical portion of the first ball; By engaging with a portion of the second ball that is formed on the outer circumferential surface of the one recess and the fitting protrusion that is fitted with the second cylindrical portion and protrudes from the inner circumferential surface of the second cylindrical portion, a second recess connecting the two inner shafts; a third recess formed in the inner circumferential surface of one of the two outer shafts located on the same side as the inner shaft in which the second through hole is formed; a fourth recess formed in the outer peripheral surface of the shaft located on the same side as the outer shaft in which the first through hole is formed, and the outer shaft and the inner shaft in a connected state are axially When the third recess is opposed to the second through hole by being relatively moved, the positions of the third recess and the fourth recess are such that the fourth recess faces the first through hole. determined, and the sizes of the third recess and the fourth recess are such that the second ball and the first ball do not engage with the second recess and the first recess, respectively, by moving toward both of the recesses. A two-shaft simultaneous connection/separation device is determined such that both inner shafts and both outer shafts can be simultaneously separated when the state is reached.