JP2850210B2 - Rotary drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drive device incorporated in a clamp device for mounting a work on a machine tool, a portable pulse wrench, or the like, and more particularly to a rotary drive device rotated by compressed air.

[0002]

2. Description of the Related Art Conventionally, for example, a pneumatic rotary driving device built in a pulse wrench includes an air motor in a case body,
The rotation of the air motor hits the anvil via a hammer, rotates the anvil, and tightens bolts and the like. As shown in FIG. 9, the air motor 70 has two compressed air intake ports 72, 72a and an intermediate exhaust port 73 between the intake ports 72, 72a so that the peripheral wall can be rotated forward and backward. A cylindrical rotor 75 in which six vanes 74,... Are fitted at equal intervals in a radially and freely retractable manner into a cylindrical cylinder 71 having a substantially oval cross section in which the side of the intermediate exhaust port 73 protrudes. Is rotatably fitted inside.

When the air motor 70 is incorporated in a pulse wrench, as shown in FIG. 10, a cylinder 71 is fitted into a case 77 constituting a pulse wrench.
Further, an upper plate 78 and a lower plate 82 are provided above and below the rotor 75, and are fixed to the case body 77. The upper shaft 80 of the rotor 75 projects from the center of the upper plate 78, and the shaft 80 is fixed to a bearing 79 provided on the upper plate 78 to ensure smooth rotation of the rotor 75. is there.

Further, a lower shaft 81 of the rotor 12 protrudes from a lower plate 82, and an anvil 85 through a torque generating portion 84.
To rotate. That is, as shown in FIG. 11, the lower shaft 81 in which the groove is formed is a cam 87 in the frame 86 of the torque generating portion 84.
Are engaged with the cam 87 and the frame 86
When the upper and lower protrusions 90 protruding from the anvil 85 are hit by the hammers 88, 88 which are swingably provided, the anvil 85 is rotated and the bolts or the like can be tightened.

[0005]

However, in the air motor 70 according to the conventional rotary driving device,
Compressed air sucked from one suction port 72 increases the volume of the air chamber 91 as it approaches the intermediate exhaust port 73,
Beyond that, the volume becomes small, so that the pressure becomes negative and the rotor 75 cannot rotate smoothly. Therefore, it is necessary to remove compressed air before the pressure becomes negative, so that the intermediate exhaust port 73 is required. However, the vanes 74,... After the compressed air is removed at the intermediate exhaust port 73 are not pressed by the air.
There has been a problem that the rotational force of the rotor 75 cannot be sufficiently obtained. Therefore, in order to obtain a desired rotational force, the size of the air motor 70 itself had to be increased.

When the air motor 70 is incorporated in a pulse wrench or the like, the upper shaft 80 of the rotor 75 is fixed to the bearing 79 of the upper plate 78,
Since the rotor 75 is configured to be rotatable via 79,
As shown in FIG. 10, a slight gap is required between the upper surface 75a of the rotor 75 and the lower surface 78a of the upper plate 78. However, adjusting such a delicate gap is mechanically difficult and must be performed by a human, and also requires a skilled person who can make further delicate adjustments. Therefore, there is a problem that the assembly of the air motor 70 is complicated.

Further, since the torque generating portion 84 is configured so that the protrusion 90 protruding from the anvil 85 is hit and rotated, the distance between the center point of the anvil 85 and the hit point hit by the hammer 88 is reduced. Nearby, there was a problem that the rotational force of the anvil 85 could not be obtained sufficiently. Therefore, the hammer 88 had to be enlarged in order to obtain a desired rotational force.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to reduce the size of the entire rotary drive by increasing the torque of the air motor and increasing the torque. Another object of the present invention is to provide a rotary drive device having a structure that can be easily assembled even by a non-expert.

[0009]

Means for Solving the Problems The present invention has been made to solve the above problems, and means for solving the problems is as follows. An air motor 2 and an air motor 2 are provided in a case body 1. and a torque generating unit 40 having a rotating member 41 rotated by, in the rotary driving device anvil head 63 by the torque generating unit 40 is rotated, the air motor 2 is, and a plurality of vanes 11 with radial and projecting and retracting freely fitted to a rotor 12, the rotor 12 is fitted in, and a substantially triangular rice ball shape in order 3 Yusuke <br/> each independent air chamber 16 of the places between the rotor 12 An upper hole 17 communicating with each of the air chambers 16 and receiving and discharging compressed air is provided on the peripheral wall of the cylinder 10, and the compressed air is discharged and sucked. that the lower hole 18 is provided respectively away, of the case body 1 The peripheral wall, communicates with the upper hole 17
Upper groove 3 and lower groove 4 communicating with lower hole 18 are formed, and
The outer wall of the case body 1 has an upper suction port communicating with the upper groove 3.
A lower suction port 7 communicating with the port 6 and the lower groove 4 is formed,
Moreover, on the outer wall surface of the case body 1, the mounting surface 25a side
Communicates with the right suction hole 29 communicating with the upper suction port 6 and the lower suction port 7
A left suction hole 30 is provided, and a substantially central portion on the non-mounting surface 25b side.
Air switching valve 25 with exhaust port 31
And the inside of the air switching valve 25
Penetration communicating with the right suction hole 29, the left suction hole 30, and the exhaust port 31
A hole 28 is drilled, and the through hole 28
The cylindrical sliding valve 27 having the small diameter portions 27a, 27b, 27c
Arm is slidably fitted to the left and right.
The valve 27 moves to the left and right by the pressure of the compressed air that is sucked in.
Moves to either the right suction hole 29 or the left suction hole 30 and the exhaust port 31
And the communication between them. The rotary drive having the above configuration is provided between the cylinder 10 and the rotor 12.
Air chamber 16 independent of the three places are formed, i.e., the air chamber 16 the vane 11 is a place to be pressed are formed three places by compressed air, the rotational force of the rotor 12 increases. Furthermore, the case body 1 is
Therefore, it moves to either the right suction hole 29 or the left suction hole 30.
Air switching valve 25 configured to communicate with exhaust port 31
Is installed, press the vane 11 of the rotor 12
After the air is discharged is extremely short
Air discharge after pressing vane 11 becomes smooth
Therefore, it is difficult to reduce the pressure of the compressed air to be sucked.
That is, the rotation force of the motor 12 can be prevented from lowering.

Further, the case body 1 is
Moved by pressure, the right suction hole 29 or left suction hole 30
Air switching bar configured to allow communication between
The compressed air after pressing the vanes 11,... In the air chambers 16,... Is quickly discharged to the outside because the lube 25 is attached. It is possible to prevent a decrease in the rotational force of 12.

[0011] Further, the means according to claim 2 provides the case body 1
Inside, an air motor 2 and a torque generating unit 40 having a rotating body 41 rotated by the air motor 2 are provided,
The anvil head 63 is formed by the rotating body 41 of the torque generating section 40.
In the rotary drive in which the air rotates, the air motor
2 is a rotor 12 in which a plurality of vanes 11 are radially and removably fitted, and a cylinder 10 in which the rotor 12 is inserted.
When fixed to the upper and lower surfaces of the rotor 12, and the upper plate 14 and the lower plate sandwiched the rotor 12 from above and below
Made 15., moreover, between the plates 14, 1 5 and both ends of the cylinder 10, a plurality of small balls 20 are laid as a bearing, each plate by the rotation of the rotor 12
14, 15 rotate integrally with the cylinder 10 and
The lower surface of the lower plate 14 is eccentric with respect to the rotation center axis.
Connecting rod 53 is provided at the position
The rotator 41 is rotated by the rotating connecting rod 53 . According to the rotation drive device having the above configuration, the plate 14, the rotor 12, and the plate 15 rotate integrally.
Therefore, there is no need to provide a gap between the plate 14 and the rotor 12.

Further, the means according to claim 3 is a case body.
1, an air motor 2 and a transmission body 62 rotated by the impact of a rotating body 41 rotated by the air motor 2.
And a torque generating portion 40 having, in anvil head 63 which is connected and fixed to said transfer member 62 at the rotation driving device for rotating, striking the protrusion 43 is a portion of the outer peripheral wall of the rotating body 41 is
The rotating body 41 has a shaft projection 43
A long hole (45) extended on the side is drilled, and
Is a bolt connecting the rotating body 41 and the air motor 2.
The tubular body 44 into which the
A sprocket is formed in the lateral hole 46 communicating from the peripheral wall of the
A bolt into which the ring 55 is inserted and which is screwed into the projection peripheral wall side
The urging force of the spring 55 acting between 56 and the cylinder 44
By this, the rotating body 41 can rotate about the axis,
Moreover, on the extension of the rotating body 41 and the striking projection 43,
A triangular insertion hole 48 is provided, and in the insertion hole 48,
The connecting rod 53 fixed to the air motor 2 is
On the other hand, a striking projection 64 is provided on a part of the inner peripheral wall 62a of the transmission body 62, and each time the rotating body 41 rotates, the striking projection 43 of the transmission body 62 is moved by the striking projection 43. The part 43 is hit and the transmission body 62 rotates. According to the torque generating unit 40 having the above configuration, the rotating body 41 having the hitting protrusion 43 rotates inside the transmitting body 62 connected to the anvil head 63, and hits the hitting protrusion 64. Therefore, the distance between the center of the anvil head 63 and the hitting projection 64 serving as a hitting point to which a force is applied is long, and therefore, the rotational force of the anvil head 63 can be increased. Further
To connect and fix the air motor 2 and the rotating body 41
The insertion hole 48 through which the connecting rod 53 required for
The rotating body 41 is formed in the striking projection 4
3. Because it moves on the straight line L connecting the axis and the connecting rod 53,
However, as shown in FIG.
Moving. Therefore, when a predetermined load is applied, the rotating body 41
As it keeps rotating eccentrically,
There is no burden. Tighten hexagon bolt 56
When attached, the urging force of the spring 55 increases.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a rotary drive device according to the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes a cylindrical case body for fitting the air motor 2 therein.
The upper and lower grooves 3 and 4 are provided on the inner peripheral wall of the inner peripheral wall 1 above and below the upper and lower grooves 3 and 4, respectively. Is fitted.

Further, a pair of left and right circular concave portions 8, 8a around which rubber packing is fitted are formed on one surface 1a of the outer peripheral wall of the case body 1. Plus its right circular recess
8, an upper suction port 6 communicating with the upper groove 3 is formed,
In addition, the left circular recess 8a has a lower suction port communicating with the lower groove 4.
7 are drilled in phase. Reference numeral 9 denotes a cover plate that closes the upper surface of the case body 1.

On the other hand, the air motor 2 has a cylinder 10 fitted and fixed in the case body 1 and rotatably inserted in the cylinder 10, and eight vanes 11,... A cylindrical rotor 12 fitted into the
An upper plate 14 and a lower plate 15 sandwiching the rotor 12 inserted therein from above and below.

More specifically, as shown in FIG. 3, the inner peripheral wall of the cylinder 10 is formed in a non-circular shape. In other words, the inner peripheral wall of the cylinder 10 is such that the peripheral wall of the inserted rotor 12 is adjacent at three places, and three air chambers 16, 16, 16 are equally spaced between the adjacent points 12a, 12a, 12a. It is formed in a substantially triangular handgrip shape in cross section to be formed. On the left side of the peripheral wall of the cylinder 10 in the vicinity of each of the proximity points 12a,..., Upper holes 17 communicating with the upper groove 3 of the case body 1 are respectively formed at equal intervals. On the right side in the vicinity, three pilot holes 18,... Communicating with the lower groove 4 of the case body 1 are formed at equal intervals.

Further, on the upper and lower surfaces of the rotor 12,
An upper plate 14 and a lower plate 15 which are larger in diameter than the rotor 12 and can be fitted in the cylinder 10 are fitted,
Moreover, the upper plate 14, the rotor 12, and the lower plate 15 are screwed together with four long screws 19,.

Between the periphery of the upper plate 14 and the lower plate 15 and the periphery of both ends of the cylinder 10,
A plurality of small balls 20,...
The rotor 12 is an upper plate 1 with bearings 20, ...
4 and the lower plate 15 are rotatable with respect to the cylinder 10. A hole 22 is formed in the center of the lower plate 15, and a screw hole 23 communicating with the hole 20 is also formed in the center of the rotor 12.

The compressed air is sucked from the upper suction port 6 of the case body 1 so that the air passes through the upper groove 3 and the upper motor holes 17, 1.
By flowing into the air chambers 16, 16, 16 from 7, 17 and pressing the vanes 11,..., The rotor 12 rotates in the cylinder 10 together with the upper plate 14 and the lower plate 15 in the α direction in FIG. Thereafter, the compressed air enters the lower holes 18, 18, and 18 and is exhausted to the outside from the lower inlet 7 through the lower groove 4 of the case body 1. On the other hand, when compressed air is sucked from the lower suction port 7, the rotor 12 rotates in the β direction opposite to the α direction, and the compressed air is discharged from the upper suction port 6.

According to the air motor 2 of the present invention, the inner peripheral wall of the cylinder 10 is formed in a substantially triangular grip shape so that the air chambers 16 and 1 are formed.
6 and 16 are provided at three locations, and upper holes 17, 17 and 17 serving as compressed air suction ports are provided in the respective air chambers 16, 16 and 16;
Since there are eight 12 vanes 11, ..., each upper hole 17,17,
The position of each vane 11,... With respect to 17 is in phase with each other. Therefore, at least one of the upper holes 17,.
One vane 11 is located in the vicinity of 17, that is, the position where the compressed air is balled, and when the compressed air is sucked, the vane 11 is immediately pressed, and as a result, the compressed air is As soon as the rotor 12 is supplied, the rotor 12 starts to rotate.

Further, one air chamber 16 has an upper hole 17 serving as a compressed air suction port (or exhaust port) and a lower hole 18 serving as a compressed air exhaust port (or suction port). Since the hole 17 and the pilot hole 18 are provided near the adjacent points 12a, 12a on the peripheral wall of the cylinder 10, the high pressure state of the air chamber 16 can be maintained to the maximum. Accordingly, the vane 11 is constantly pressed by compressed air in the air chamber 16 from the time of intake to the time of exhaust, and is unlikely to be in a low-pressure state in the air chamber as in the related art. Can be increased,
Therefore, the size of the air motor itself can be reduced.

The rotor 12 is connected to the cylinder 1 via small balls 20,... Together with the upper plate 14 and the lower plate 15.
Since it is freely rotatable with respect to 0, the rotation of the air motor 2 can be obtained only by integrally fastening the rotor 12, the upper plate 14, and the lower plate 15. Therefore, like a conventional air motor, the upper plate
It is not necessary to adjust the gap between the rotor 14 and the rotor 12, and even an operator who has not mastered such an adjusting technique can easily assemble the apparatus, and of course, can also manufacture it mechanically.

Reference numeral 25 denotes a pair of left and right sides which are attached to one surface 1a of the case body 1 via plate-like connecting members 32, 32 (omitted in FIG. 2) and to which a hose of a compressed air supply device such as a compressor can be connected. This shows an air switching valve provided with a hose mounting port, that is, a right hose mounting port 26 and a left hose mounting port 26a.

As shown in FIGS. 4 and 5, a through hole 28 is formed in the air switching valve 25 in a direction perpendicular to the axis of the air motor 2 and the left and right hose mounting portions 26 are provided. , 26a. In the through hole 28,
A cylindrical slide valve 27 slidable left and right in the through hole 28 is fitted therein. Both ends of the slide valve 27 have small diameters on the left and right to form an air passage between the slide valve 27 and the through hole 28. Portions 27a and 27b are formed, and a central small-diameter portion is formed to form an air passage also in the central portion.
27c is formed.

Further, the mounting surface 25a of the air switching valve 25
Has a circular recess 8 in which the upper suction port 6 of the case body 1 is formed.
A pair of upper and lower right suction holes 29 that can be seated in the inside, and a pair of upper and lower left suction holes 30 that can be seated in the circular recess 8a formed with the lower suction port 7 are provided. The hole 29 and the left suction hole 30 communicate with the through hole 28. An exhaust port 31 communicating with the through hole 28 is provided at a substantially central portion of the non-mounting surface 25b of the air switching valve 25.

Reference numerals 33,... Denote ring-shaped rubber packings fitted on the inner wall of the through hole 28 in order to maintain airtightness between the slide valve 27 and the through hole 28. Reference numerals 34, 34 denote through holes. Since both ends of 28 are sealed by the connecting members 32, 32, the connecting members 32, 3
2 shows a ring-shaped rubber packing fitted in
... indicate bolt holes for fixing the air switching valve 25 and the case body 1.

The air switching valve 25 having the above configuration is
When a hose is connected to the right hose mounting port 26 and compressed air is sucked, the compressed air passes through an air passage formed between the right small diameter portion 27b of the air switching valve 25 and the through hole 28, and the right suction hole Enter 29 (arrow a shown in Fig. 4), and the case
1 is supplied into the air motor 2 from the upper suction port 6, and the rotor 12 rotates in the α direction as described above. Then, the compressed air pressing the vanes 11,... Enters the left suction hole 30 from the lower suction port 7 of the case body 1, and the air switching valve 25
The air is discharged to the outside from an exhaust port 31 provided on a non-mounting surface 25b of the air switching valve 25 through an air passage formed between the small and medium diameter portion 27c and the through hole 28 (see arrow B in FIG. ).

On the other hand, when the air motor 2 is reversed, a hose is connected to the left hose mounting port 26a of the air switching valve 25. The supplied compressed air is an air switching valve
The air enters the air passage formed between the left small diameter portion 27a of 25 and the through hole 28. Then, as shown in FIG. 6, the compressed air presses the left surface 27d of the slide valve 27 to move the slide valve 27 to the right, and the through hole 28 and the left suction hole 30 are opened to compress. Air is supplied from the lower suction port 7 of the case body 1 to the air motor.
2 (arrow C in FIG. 6), and the rotor 12 rotates in the β direction opposite to the α direction. And the compressed air is the case body
1 enters the right suction hole 29 from the lower suction port 7 and is discharged to the outside from the exhaust port 31 of the air switching valve 25 through the space formed between the small and medium diameter portion 27c of the air switching valve 25 and the through hole 28. (Arrow d in the figure).

According to the air switching valve 25 of the present invention, since the passage distance until the air is discharged after pressing the vane 11 of the rotor 12 is extremely short, the discharge of the air after pressing the vane 11 can be reduced. As a result, the suctioned compressed air is less likely to be decompressed, so that a decrease in the rotational force of the rotor 12 can be prevented.

As shown also in FIG. 7, reference numeral 40 denotes a bottomed cylindrical rotating body 41 having a striking projection 43 projecting from a part of the outer peripheral wall, and the rotating body 41 is fitted inside the rotating body 41. A torque generating portion is formed by a cylindrical transmitting body 62 having a projecting projection 64 projecting from a part of a peripheral wall 62a, and an M20, pitch 1 screw is internally provided below the transmitting body 62. The provided cylindrical anvil head 63 is protruded.

An elongated hole 45 is formed in the axis of the rotating body 41 so that the cylindrical body 44 can be loosely fitted therein, and is extended from the axis to the striking projection 43 side. On the peripheral wall of the projection of the portion 43, a horizontal hole 46 is formed in which a screw is provided in a direction perpendicular to the axis and communicates with the long hole 45. On the other hand, on the extension of the axis of the rotating body 41 and the striking projection 43, an insertion hole 48 having a substantially triangular cross section is formed in parallel with the axis.

The rotating body 41 has a disc-shaped holding plate in which a cylindrical body 44 is fitted into a long hole 45 and a hole is formed in the center.
The bolt 50 is inserted into the hole 22 of the lower plate 15 through the cylindrical body 44 through the hole, and the screw hole of the rotor 12 is
It is connected to the air motor 2 by being screwed in at 23.

Further, a connecting rod is provided in the insertion hole 48 of the rotating body 41.
The upper end of the connecting rod 53 is fitted with the lower plate 15.
Of the lower plate 15 with respect to the rotation center axis of the lower plate 15.
The lower end of the connecting rod 53 is fitted into the hole 54 of the holding plate 49, and the lower end of the connecting rod 53 is inserted into the hole 51 provided at the eccentric position.
Is fixed. The rotating body 41 is integrated with the air motor 2 by the connecting rod 53 and the bolt 50, and rotates together with the air motor 2.

The horizontal hole 46 of the rotating body 41 has a spring
55 is inserted, and the hexagon socket head bolt 56 is screwed, so that a biasing force by the spring 55 acts between the hexagon socket head bolt 56 and the cylinder 44, that is, the rotating body 41 is It is always biased toward the core. Therefore, the rotating body 41 is configured to rotate about the axis unless an external load is applied. The striking projection 43 of the rotating body 41 housed inside the transmission body 62 rotates close to the inner peripheral wall 62a of the transmission body 62.

Reference numeral 58 denotes a holding ring fitted inside the case body 1 for holding the lower surface of the cylinder 10 of the air motor 2, and a ring-shaped frame below the holding ring via a plurality of balls 59,. A body 60 is provided rotatably.

Further, on a part of the inner peripheral wall 62a of the transmission body 62, a hitting projection 64 is provided so as to protrude in the axial direction. 66
Indicates an end cover attached to the lower side of the case body 1 and provided with a hole through which the anvil head 63 of the transmission body 62 can protrude, and between the end cover 66 and the lower outer periphery of the transmission body 62. A plurality of balls 67 are spread.

The torque generating section 40 having the above-described structure, when the air motor 2 rotates, causes the striking projection 43 to be transmitted to the transmission member.
It rotates while approaching the inner peripheral wall 62a of 62 (arrow E in FIG. 7). Then, as shown in FIG. 8A, when the hitting projection 64 of the transmission body 62 is reached, the hitting projection 64 is attached to the hitting projection.
As a result, the transmission body 62 rotates together with the rotation of the rotating body 41. At this time, since the striking projection 64 is provided on the inner peripheral wall 62a of the cylindrical transmission body 62, the point at which the striking projection 43 of the rotating body 41 strikes the striking projection 64 and the transmission body 62 The distance from the center point is long, and the rotational force of the transmission body 62 per hit is high. Furthermore, the larger the diameter of the transmission body 62, the higher the rotational force per impact will be,
Further, even if the weight of the rotating body 41 is increased, the rotational force of the hitting body 62 is increased. Accordingly, when the same torque as that of the conventional configuration in which the protrusion projecting from the anvil is hit by the rotating body is generated, the entire torque generating unit 40 can be reduced in size.

Next, when the bolts and the like cannot be tightened, that is, when the rotation of the transmission body 62 is suppressed,
As shown in FIGS. 8B and 8C, the striking projection 43 of the rotating rotator 41 rides over the struck projection 64 of the transmitting body 62 and continues to rotate. That is, when a load is applied to the rotating body 41, the spring 55 of the lateral hole 46 contracts, and the rotating body 41 that has been rotating about the cylindrical body 44 is eccentric along the long hole 45, and the striking projection is formed.
43 repeats the operation of climbing up on the struck projection 64 and rotating once again, striking the struck projection 64 of the transmission body 62 and rotating again.

At this time, since the insertion hole 48 through which the connecting rod 53 necessary for connecting and fixing the air motor 2 and the rotating body 41 is formed in a substantially triangular shape, the rotating body 41 A straight line L connecting the projection 43, the axis and the connecting rod 53
Instead of moving upward, it moves with a slight displacement as shown in FIG. In other words, because there is play,
When a predetermined load is applied, the rotating body 41 continues to rotate with certain eccentricity, so that no excessive load is applied to the air motor 2. When the hexagon bolt 56 is tightened, the urging force of the spring 55 increases.

In the above embodiment, the cylinder 10 is formed in a substantially triangular shape so as to have three air chambers 16, 16, 16, but the air chamber is not necessarily limited to three. The cylinder 10 may be formed so that three or more air chambers may be formed. Also, as described above, the number of vanes 11,... Fitted in the rotor 12 may be at least one in the vicinity of the compressed air suction port, and may be appropriately changed in design.

[0041]

As described above, the rotational drive device according to the present invention increases the rotational force of the air motor by providing three or more air chambers as described above. Can be achieved. In addition, d
Since the compressed air can be quickly discharged by the air switching valve, the compressed air on the suction side is hardly depressurized, and therefore, the rotational force of the air motor does not decrease.

Further, as in the means according to claim 2, by rotating integrally with the plate and the rotor, as in the prior art, it is not necessary to provide a subtle gap between the plate and the rotor. Therefore, the rotational drive device can be assembled even by a non-expert, and the production efficiency can be improved.

Further, according to the third aspect of the present invention, it is possible to increase the rotational force of the anvil head, which acts as an operating shaft for tightening bolts and the like. Therefore, the size of the rotary drive device can be reduced as a whole.
The insertion hole through which the connecting rod is inserted is formed in a substantially triangular shape.
That the rotating body is slightly displaced
When moving, and thus applying a certain load, the rotating body
Eccentrically and continue to rotate, so excessive air motor
There is no burden.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a rotary drive device according to the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is an end view taken along line AA of FIG. 1;

FIG. 4 is an end view taken along the line BB of FIG. 1;

FIG. 5 is a front view showing an embodiment of the rotary drive device according to the present invention.

FIG. 6 is an end view showing a state in which a sliding valve of the air switching valve has moved to the right.

FIG. 7 is an end view taken along line CC of FIG. 1;

FIG. 8 is an end view of the torque generating unit, wherein (a),
The state in which the rotating body rotates in the transmission body in the order of (b) and (c) is shown with time.

FIG. 9 is a sectional view showing an air motor of a conventional rotary drive device.

FIG. 10 is a sectional view showing a state where the rotary drive device is attached to a case body.

FIG. 11 is an exploded view showing a torque generating section of a conventional rotary drive device.

[Explanation of symbols]

1 ... case body, 2 ... air motor, 3 ... upper groove, 4 ... lower groove, 6 ... upper suction port, 7 ... lower suction port, 10 cylinder, 11 ... vane, 12 ... rotor, 14 ... plate, 15 ... plate, 16 …
Air chamber, 17: Upper hole, 18: Lower hole, 20: Ball, 25: Air switching valve, 25a: Mounting surface, 25b: Non-mounting surface, 27: Sliding
Valves, 27a, 27b, 27c: small diameter portion, 28: through hole, 29: right suction
Mouth, 30… Left suction port, 31… Exhaust port, 40… Torque generator, 41
... Rotating body, 43 ... Striking projection, 44 ... Cylinder, 45 ... Long hole, 46 ...
Lateral hole, 48 ... insertion hole, 50 ... bolt, 53 ... connecting rod, 55 ... sp
Ring, 56: bolt screwed to the projection peripheral wall side, 62: transmission body, 62a: inner peripheral wall, 63: anvil head, 64: hitting projection

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B25B 21/00 B25B 21/02 F01C 1/344 F01C 13/02

Claims (3)

(57) [Claims] 1. An air motor (2) in a case body (1).
And a rotating body (41) rotated by the air motor (2)
And a torque generator (40) having
(0), the air motor (2) includes a plurality of vanes (1).
1) a radially and removably fitted rotor (12),
The rotor (12) is fitted therein, and 3
And a cylinder (10) formed in a substantially triangular grip shape so as to have independent air chambers (16) at respective locations, and further, on the peripheral wall of the cylinder (10), the air chambers (16) are provided. Communication,
An upper hole (17) for sucking and discharging compressed air and a lower hole (18) for discharging and sucking compressed air are provided apart from each other, and the inner hole of the case body (1) is provided with the upper hole. An upper groove (3) communicating with the upper groove (3) and a lower groove (4) communicating with the lower hole (18) are formed, and an upper suction port communicating with the upper groove (3) is formed on an outer wall surface of the case body (1). A lower suction port (7) communicating with the mouth (6) and the lower groove (4) is formed, and the upper suction port (7) is provided on the outer wall surface of the case body (1) on the mounting surface (25a) side. A right suction hole (29) communicating with 6) and a left suction hole (30) communicating with the lower suction port (7) are provided, and an exhaust port (31) is provided at a substantially central portion on the non-mounting surface (25b) side. The provided air switching valve (25) is attached, and the inside of the air switching valve (25) communicates with the right suction hole (29), the left suction hole (30) and the exhaust port (31). Through holes (28) are formed, and the through holes (28) have small diameter portions (2
A cylindrical sliding valve (27) having 7a), (27b), and (27c) is slidably fitted to the left and right by compressed air. A rotary drive device configured to move left and right by a pressing force so as to be able to communicate either a right suction hole (29) or a left suction hole (30) with an exhaust port (31). 2. An air motor (2) in a case body (1).
And a rotating body (41) rotated by the air motor (2)
And a torque generator (40) having
In the rotary drive device in which the anvil head (63) is rotated by the rotating body (41) of (0), the air motor (2) is a rotor in which a plurality of vanes (11) are fitted radially and removably. (12) and a cylinder (10) in which the rotor (12) is inserted.
And fixed to the upper and lower surfaces of the rotor (12) , and the rotor (1
2) consists of an upper plate (14) and a lower plate (15) sandwiching the cylinder (10) from above and below.
A plurality of balls (20) are spread as bearings between the end and each of the plates (14) and (15), and each plate (14) and (15) is rotated by the rotation of the rotor (12) to move the cylinder (10). , And on the lower surface of the lower plate (14),
A connecting rod (53) is provided at a position eccentric to the rotation center axis.
And a connecting rod (53) rotating together with the lower plate (14).
And the rotating body (41) rotates . 3. An air motor (2) in a case body (1).
And a rotating body (41) rotated by the air motor (2)
A torque generating portion (40) having a transmitting body (62) rotated by the impact of the rotating body, wherein the anvil head (63) connected and fixed to the transmitting body (62) rotates. A striking projection (43) is protruded from a part of the outer peripheral wall of the body (41), and an elongated hole extended toward the striking projection (43) is formed on the axis of the rotating body (41). (45) is drilled, and in the long hole (45),
A tubular body (44) into which a bolt (50) for connecting the rotating body (41) and the air motor (2) is fitted is loosely fitted,
A lateral hole communicating from the peripheral wall of the projection (43) to the elongated hole (45)
A spring (55) is inserted into the (46), and the rotating body (41) is actuated by the urging force of the spring (55) acting between the bolt (56) screwed into the projection peripheral wall and the cylindrical body (44). ) Is rotatable about the axis, and the rotating body (41) and the striking projection
A substantially triangular insertion hole (48) is provided on an extension of (43), and a connecting rod (53) fixed to the air motor (2) is inserted into the insertion hole (48). On the other hand, a projecting projection (64) is provided on a part of the inner peripheral wall (62a) of the transmitting body (62), and the projecting projection is formed every time the rotating body (41) rotates. Department
A rotary drive device wherein the striking projection (43) of the transmitting body (62) is hit by the (43) to rotate the transmitting body (62).