JPS63106407A - Valve device - Google Patents

Abstract

PURPOSE:To enable a driving equipment of changing in speed steplessly from a low speed to a high speed by varying the cross-section of an air passage according to displacement of a valve. CONSTITUTION:A handle 23 is mounted on a cylinder 20 and a cylinder chamber 31 is formed inside the handle 23. And a valve body 26 which can be displaced axially, consists of a valve 41 possible of making angular displacement through the axis, and has slits 60 and 61 formed on the valve 41 is inserted inside the cylinder chamber 31. The cross-section of an air passage can be therefore varied according to displacement of the valve 41, and a driving equipment can be rotated in the clockwise and counterclockwise direction without the need of a special change valve, on account of which the driving equipment can be varied in speed steplessly from a low speed to a high speed and also in direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention applies to a valve device provided in, for example, an air drill.

Background technology FIG. 11 is a typical prior art cross-sectional view.

Valve equipment ff for air drills! 1 is one end of a valve body 5 that includes a cylinder 3 provided in a cylinder chamber 2 and a valve body 5 inserted through an insertion hole 4 in the cylinder 3! 1 (111
The right end (in the figure) protrudes to the outside of the air drill main body 6, and the protrusion constitutes a manual operation section 7. A closing member 8 that closes the insertion hole t is formed at the other end of the valve body 5. An O-ring 9 is attached to the outer periphery of the closing member 8. Further, a spring 10 is interposed between the operating portion 7 and the cylinder 3.

The cylinder 3 has an air guide hole 11 formed therein, one end communicating with the air outflow passage 12 and the other end communicating with the insertion hole 4 . The other end of the air outflow passage 12 faces a rotor (not shown) connected to the rotating shaft of the air drill.

Air is pumped from an air compressor (not shown) and supplied to the room 14 via the flow path 13.

Therefore, in the normal state, the closing body 8 closes the opening of the insertion hole 4. By pressing the operating lever 7 in this state, the valve body 5 is displaced to the left in FIG. 11. The air thus supplied into the room 14 flows into the insertion hole 4, further passes through the air guide hole 11, and then passes through the air outlet passage 1.
2%2 led.

The air flowing out from the outflow passage 12 is blown against the fins of the rotor, thereby rotating the rotor and driving the drill blade in rotation.

While invention tries to solve! Point g In the prior art described above, the flow rate of air guided to the outflow passage hole 12 by the operation of the drilling section 7 is constant, and therefore the rotational speed of the air drill is also always constant. On the other hand, when positioning the center of a tap or the like, it is desired to operate at low speed first and then at high speed, but conventional air drills cannot perform such operations.

Furthermore, in order to solve the above-mentioned problem, some devices have a structure in which a speed change mechanism is interposed, but even such devices have a large number of speed change steps (but only about 4 to 5), so that they can smoothly move from low speed to high speed. It is not light to drive the rotation.

Further, in conventional air drills, the direction of rotation thereof is predetermined, and therefore, it has been desired for a single air drill to be capable of forward and reverse rotational driving.

An object of the present invention is to solve the above-mentioned technical problems and to provide a valve device in which a drive source can be continuously variable from low speed to high speed and can rotate in forward and reverse directions.

Means for Solving the Problems The present invention provides an external IN of a cylinder arranged in a cylinder chamber.
'! ! The cylinder is equipped with an inlet through which compressed air flows, and a pair of left and right discharge ports that communicate with the inlet and are located ahead of the inlet in the axial direction and offset in the circumferential direction. The outer circumferential wall of the valve body, which is displaceable in both directions and angularly displaceable around the axis, has an opening area that can face the inlet and overlap with the inlet as the valve body is displaced in the axial direction. This valve device is characterized in that it is provided with a slit that is variable, and an air guide hole that communicates with the slit and can face one side of the discharge port on the axially front side of the slit.

Function According to the present invention, by pushing the valve body, the opening area of the slit formed in the valve body facing the inlet of the cylinder gradually increases. At the same time, the air guide hole formed in the valve body faces one of the discharge ports of the ring, and the opening area with the discharge port gradually increases.

Therefore, as the valve body is displaced, the flow rate of air flowing into the valve body from the inflow port gradually increases, and in accordance with this, the flow rate of air flowing out of one of the discharge ports gradually increases. In other words, the amount of air flowing out from the exhaust port of the cylinder can be made variable as the valve body is displaced.

Further, the valve body is angularly displaced around its axis so that the air guide hole faces one of the pair of left and right exhaust ports.

This allows the compressed air flowing in from the inlet to flow out from the pair of outlet ports.

Therefore, by using a valve device having such a configuration in an air drill, the rotational speed of the air drill can be variably adjusted from low speed to high speed. Furthermore, by configuring one discharge port and the other discharge port of the cylinder to face the left and right sides of the rotor connected to the rotating shaft of the air drill, the air drill can be driven in forward and reverse rotation. can.

Embodiment FIG. 1 is a sectional view of an embodiment of the present invention. The main body 21 of the air drill 20 includes a cylindrical portion 22 and a handle 23. This circular #21 portion 22 is provided with a drill chuck (not shown), and a drill blade 24 is attached to this drill chuck. The drill chuck is connected to a rotating shaft (not shown), and the rotating shaft is rotationally driven by a rotor 25.

Inside the cylinder chamber 31 of the handle 23 is a valve system f according to the present invention.
i26 is stored. This valve 1fi26 is designed to vary the flow rate of air fed from the air pressure pump to the rotor 2.
It functions to supply 5. Further, as will be described later, the rotor 25 can be driven to rotate in the forward and reverse directions by the function of the valve device fi26. An air escape hole 80 is formed on the rear side of the cylinder chamber 31. *Cylinder chamber 3
The opening of the exhaust passage 90, 91 faces the front side of the exhaust passage 90, 91.

FIG. 2 is a sectional view taken along the section line XX in FIG. 1, FIG. 2A is a sectional view taken along the section line XX in FIG. FIG. The rotor 25 is disposed within the circular hole 27 of the cylindrical portion 22, and the rotor 25
5 is attached within this circular hole 27 at a position where its axis is eccentric. That is, the lower part of the rotor 25 is close to the inner peripheral surface of the circular hole 27, and the upper part of the rotor 25 is far apart from the inner peripheral surface of the circular hole 27. A plurality of fins 28 are attached to the rotor 25 so as to be displaceable radially outward in the circumferential direction, and as the rotor 25 rotates, the fins 28 are recessed into the outer peripheral surface of the rotor 25 near the lower part. However, as the fin 28 is angularly displaced from near the bottom to the upper position,
protrudes from the surface of the rotor 25 and has a circular hole 27 at its tip.
An air escape hole 29 is formed in the upper part of the zero cylindrical portion 12 that extends to the vicinity of the inner circumferential surface of the cylinder.

An air guide passage 30 is formed in the handle 23, through which compressed air from an air pressure source flows. This air guide passage 30 communicates with a cylinder chamber 31. Further, one opening of the air guide passage 32 faces the left inner circumferential wall of the cylinder chamber 31. The other opening of the air guide passage 32 is connected to the rotor 2.
It is formed facing the left side and lower position of 5. On the other hand, the other guide passage 33 is formed such that one open end faces the right side wall of the cylinder chamber 31 and the other open end faces near the lower right side of the rotor 25 in the circular hole 27 . Therefore, as will be described later, the air flow rate of the compressed air that has flowed in through the air guide passage 30 is adjusted by the action of the valve device 26, and when it flows out to the left side of the rotor 25 through the guide passage 32, the rotor 25 is It is rotationally driven in the forward rotation direction, which is the direction of arrow A1 in the figure. At this time, the air compressed by the fins 28 on the right side in FIG. 2 flows into the exhaust passage 90 as shown in FIG. 2A, and is discharged through the cylinder chamber 31 and the exhaust passage 91. Further, when the air flows out from the right side of the rotor 25 through the guide passage 33 via the valve device 26, the rotor 25 moves to
Rotationally driven in the force direction.

At this time, the air compressed by the fins 28 on the left side in FIG. 2 is exhausted through the exhaust passage 90, the cylinder, and the exhaust passage 91 in the same manner as described above.

Note that the air flowing out from the guide passage 32 acts on the fins 28 of the rotor 25, thereby rotating the fins 28, and accompanying this rotation, the fins 28 further protrude outward in the radial direction and are efficiently driven. Note that the air that has flowed into the circular hole 27 is discharged through the escape hole 29.

FIG. 4 is an exploded perspective view of the valve device 2G according to the present invention.

The valve system fi2G includes a cylinder 40 provided in the cylinder chamber 31 and a valve body 41 inserted through the cylinder 40.
The cylinder 40 includes a 111 part 40a, a second cylindrical part 40b that is continuous with the first cylindrical part 40a and has a larger diameter than the first cylindrical part 40a, and a second cylindrical part 40bl: a continuous part of the first cylindrical part 40.
These cylindrical portions 40a, 40b+40e, which include a third cylindrical portion 40c having the same diameter as a, and a fourth Q portion 40d that is connected to the 312th portion 40c and has a larger diameter than the second cylindrical portion 4゜b,
An insertion hole 42 is formed in the center of 40d. This insertion hole 42 has a circular cross section perpendicular to the axis. First cylindrical part 40
An O-ring 43 is attached to the outer periphery of the left end of a. Further, O rings 44°45
are installed respectively. Further, an O-ring 46 is attached to the outer periphery of the left end of the fourth cylindrical portion 40d.

A long hole 47 extending in the axial direction and serving as an inlet into which compressed air flows is formed in the 1f2 portion 40a.

As shown in FIG. 5, this elongated hole 47 is arranged at the lower part of the outer peripheral surface of the i@2 cylindrical portion 40a and communicates with the guide passage 30.

Round holes 49 and 50 are formed in the second fi section 40b as exhaust ports for compressed air. The round holes 49, 50 are arranged on one diameter line of the second cylinder 940b, as shown in FIG. These round holes 49 and 50 are offset by 90 degrees in the circumferential direction from the elongated holes 47 and 48, respectively.

The cylinder 40 having such a configuration has the elongated hole 47
are arranged in the cylinder chamber 31 so that the round hole 5o communicates with the guide passage 30, the round hole 5o communicates with the guide passage 32, and the round hole 49 communicates with the guide passage 33.

The valve body 41 inserted through the insertion hole 42 of the cylinder 40 includes a cylindrical portion 51 having a diameter slightly smaller than the insertion hole 42;
A cockbin 53 is attached to the end of the drive rod 52, including the drive rod 52 connected to the cylindrical portion 51, by a screw 54. A fill spring 55 is externally attached to the shaft 1553a of the cockbin 53, and the coil spring 55 is interposed between the end of the fourth cylindrical portion 40d of the cylinder 40 and the head 53b of the cockbin 53. Therefore, the valve body 41 is
O-rings 56 and 57 are attached to the rear side of the O-cylindrical portion 51 which is biased by a spring in the discharge direction F2 (right side in FIG. 1). This O-ring 56 * 57 is at least thicker than the length in the longitudinal direction of the long hole 47 (it is selected, and the O-ring 56
, 57111, air from the guide passage 30 is prevented from flowing into the cylinder 40. As will be described later, when the valve body 41 is pushed in along the insertion direction F1 and the O ring 57 reaches a position facing the elongated hole 47, air is allowed to flow in through the elongated hole 47. .

The cylindrical part 51 has an O ring 57 as shown in the PtS7 diagram.
It is hollow toward the front (to the right in FIG. 7) from a position near , and a portion ff170 is formed. This columnar part 51
A slit 60.61 is formed on the outer periphery of the hollow portion 51a and extends forward in the axial force direction from a position near the O-ring 57. As shown in FIG. 8, this sleeve 61 is arranged on one diameter line of the hollow portion 51a. Either one of the slits 60, 61 overlaps the elongated hole 47 as the valve body 41 is displaced in the insertion direction F1, thereby making it possible to vary the amount of air inflow.

Further, a long hole 62 serving as an air guide hole extending in the axial direction is formed in the hollow portion 51a on the front side of the slit 60. As shown in FIG. 9, this elongated hole 62 is formed to be offset from the sleeve 60, 61 in the circumferential direction. slit 6
Width iJ of 0! i, slit 61 and width pressure J! 2 is chosen to be equal to the number E, and the width pressure of the elongated hole 62 is J! 3 is chosen to be much larger than the width 11 of the slit 61. That is, by making the width of the sleeves 60 and 61 minute, the inflow amount can be minutely changed. For forward rotational drive, the valve body 41 is rotated so that the elongated hole 62 is circular (in the state where L4 is facing, the sleeve) 60 is facing the elongated hole 47. Further, since the valve body 41 is rotated in the reverse direction, when the elongated hole 62 faces the circular hole 50, the slit 61 faces the elongated hole 47. Therefore, in either case, the flow rate of air flowing in through the passage 30 can be made variable as the valve body 41 is displaced.

FIG. 10 is a diagram for explaining the operation of the valve system W12G according to the present invention. In the state shown in FIG. 10(1), the slit 47 is closed by the cylindrical portion 51 of the valve body 41, so the drill blade 24 is stopped.

When performing cutting using the drill blade 24, the tip of the drill blade 24 is first positioned. At this time, the drill blade 24 needs to be rotated at an extremely low speed, and for such an operation, the operator lightly pushes the cockbin 53 along the insertion direction F1, thereby causing the compressed air in the chamber 79 to , flows out to the atmosphere from the air vent hole 80. Therefore, the cockbin 53 can be pushed in only by applying an extremely small force. Due to this pushing operation, the slit 60 slightly overlaps the elongated hole 47.
This slot 62 also slightly overlaps the circular hole 49, so the air follows the following path.

Guidance passage 30 → Harukana 47 → Surits) 60.61 → Room 7
Flows as follows: 0 → hole 62 → circular hole 49 → passage 33. Air is therefore discharged from the right side of the rotor 25. At this time, as mentioned above, the weight i between the elongated hole 47 and the slit 60 is
What is the opening area and the ffl double opening area of the circular hole 49 and the long hole 62 due to the displacement of the valve body 41? ! 4 will be adjusted. In such a state shown in FIG. 8(2), the discharge amount is extremely small, and therefore the drill blade 24 is rotationally driven at an extremely low speed.

After the tip is positioned in this way, as shown in Figure M8 (3), the valve body 41 is gradually pushed in, thereby increasing the overlapping opening area of the elongated hole 47 and the slit 60. The overlapping opening area of the hole 62 and the circular hole 49 gradually increases, and accordingly, the amount of discharge to the rotor 25 gradually increases. Therefore, the rotational speed of the drill blade 24 gradually increases from a low speed. In this way, the speed of the drill blade 24 can be increased without any loss of speed, so the rotation speed of the drill blade 24 is increased by 1
By performing alignment at low speed and increasing the rotational speed smoothly, it becomes possible to cut in a natural state without strain.

Note that when changing from high-speed rotation to low-speed rotation, by loosening the hook pin 53, the valve body 41 is displaced in the discharge direction F2 by the spring force of the spring 55.

Therefore, shifting from high speed to low speed can be performed easily.

Moreover, when rotating the drill blade 24 of such an air drill 20 in the opposite direction, the valve body 41 may be angularly displaced by 180 degrees so that the elongated hole 52 faces the circular hole 50.

Although the above embodiment describes an air drill, the valve system fi26 according to the present invention can be used in a wide variety of other applications.

Effects As described above, according to the present invention, the cross section of the air flow path can be made variable according to the displacement of the valve body, so when such a valve device is used in an air drill, the drill The speed of the blade can be changed steplessly from low speed drive to high speed drive rjh. Therefore, cutting work can be performed at a desired speed, and workability is improved. Further, the drill blade can be rotated in forward and reverse directions without providing a special switching valve or the like. Furthermore, in order to enable extremely low speeds,
Positioning the tip of the drill blade becomes extremely easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, tjS2A is a sectional view taken from the section aX-X in Fig. 1, and Fig. 2 is a sectional view of an embodiment of the present invention.
3 is an exploded illusion diagram of the rotor 25, FIG. 4 is an exploded perspective view of the valve device 2G, and FIG. 5 is a sectional view taken along the section line ■-■ in FIG. 6 is a sectional view taken from the section line Vl-Vl in FIG. 4, and FIG. 7 is a sectional view taken from the section line ■--■ in FIG. Figure 8 is a sectional view taken from the section line ■-■ in Figure 7, and Figure 9 is
4, FIG. 10 is a diagram for explaining the operation of the valve device f126, and FIG. 11 is a sectional view of a typical prior art. 20... Air cylinder, 21... Air cylinder body, 24... Drill blade, 25... Rotor, 26...
··valve! Icra, 30t32.33. ,, air guide passage, 31... cylinder chamber, 40-... cylinder, 40
a*40 b-40c-40d...cylindrical part, 41...
・Valve body, 43, 44.45146?56.57...O
Ring, 47.62...long hole, 49°50...round hole, (io, 61...slit agent patent attorney number of strokes Keiichibetsu Figure 1) Figure 5 Figure 6 Procedural Amendments 1986 April 15th

Claims (1)

[Claims] The outer circumferential wall of the cylinder disposed in the cylinder chamber includes an inlet into which compressed air flows, and a pair of left and right pairs communicating with the inlet and located ahead of the inlet in the axial direction and offset in the circumferential direction. The outer circumferential wall of the valve body, which can be displaced in the axial direction within the cylinder by manual operation and can be angularly displaced around the axis, has a a slit that can face the inflow port and have a variable overlapping opening area with the inflow port; and an air guide that communicates with the slit and can face one side of the discharge port on the axially front side of the slit. A valve device characterized by being provided with a hole.