KR920004671B1 - Impulse wrench - Google Patents

Abstract

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Description

Impulse wrench

1 is a cross-sectional view of the impulse wrench of the present invention.

Figures 2-4 show a first embodiment of the present invention, and Figure 2 shows a cross-sectional view of the liner.

3 is a perspective view of the main shaft.

4 is a side view of the main shaft.

5A to 5D are cross-sectional views of the hydraulic pulse generator, each of which shows a change in the state of the liner seal during one rotation of the liner.

6 to 9 show a second embodiment of the present invention, and FIG. 6 shows a perspective view of the main shaft.

7 is a side view of the main shaft.

FIG. 8 is an explanatory diagram showing an intersection state between the seal portion c of the liner and the seal portion y of the main shaft in FIG. 5C.

FIG. 9 is an explanatory view showing an intersection state between the seal portion d of the liner and the seal portion x of the main shaft in FIG. 5C. FIG.

10 to 15 are perspective views of a main shaft showing another embodiment in which the shape of the seal portion is changed.

* Explanation of symbols for main parts of the drawings

1: wrench body 2: motor

3: Hydraulic pulse generator 4: Handle

5: supply port 6: exhaust port

7: Forward and reverse switching valve 8: Throttle lever

9: liner case 10: liner

11: main shaft 16: blade

17: insertion hole 18: guide hole

20: weight balance hole

The present invention relates to an impulse wrench of two blades and more particularly to an impact pulse generating mechanism of an impulse wrench of two blades.

Recently, an impulse wrench for converting a hydraulic impact force into tightening torque is often used for tightening bolt nuts and the like. And at present, it has been developed to have several drive blades (blades) for generating an impact pulse. However, such an impulse wrench has the drawback that the tightening torque per impact pulse is small.

This is because increasing the number of blades increases the number of impact pulses generated during one rotation of the liner, thereby decreasing the inertia force of the rotated liner.

In addition, impulse wrenches generally have a small output compared to a heavier weight, so that the motor part and the hydraulic pulse generating part need to be enlarged to obtain a high tightening torque.

Therefore, if a predetermined tightening torque is obtained, the impulse wrench having the above-described multiple blades must be heavy, which puts a heavy burden on the worker.

Therefore, in recent years, an impulse wrench has been devised which only generates one pulse per revolution of the liner despite having two blades (see Utility Model Application Publication No. 59-140173).

These two blade impulse wrenches have two opposite straight seals installed on the inner circumferential surface of the liner, which may be more eccentric than a straight line passing through the center of the liner seal, and at the center of the main shaft between the two blades of the main shaft. The two linear seal portions formed at positions symmetrical with respect to each other are also eccentric to the liner seal than the straight line passing through the main shaft center.

However, these two blade impulse wrenches offset both the inner circumferential surface of the liner and the seal formed on the main shaft, so the volume of the two high pressure chambers out of the four threads formed at the time of torque generation is slightly different. The magnitude of the applied pressure was varied, resulting in an unbalance in the weight balance during rotation, which caused rotational vibration.

In view of such circumstances, an object of the present invention is to provide an impulse wrench having two blades in which rotational vibration does not occur.

Another object of the present invention is to provide an impulse wrench having two blades with low rotational resistance.

It is a further object of the present invention to provide an impulse wrench consisting of two blades which is easy to manufacture and at the same time has a large generating torque compared to conventional impulse wrenches of the same size.

In accordance with the first aspect of the present invention, in accordance with the first aspect of the present invention, there is provided a liner which is rotated by a motor and a main shaft and a main shaft which are rotatably inserted in the liner so as to have the same axis. Two blades are inserted into each of the two grooves formed in the shaft so as to be protruded from each other, and the two outer blades are in contact with the inner circumferential surface of the liner in contact with each other. The inner circumferential surface of the liner is rotated by the liner. In a two-blade impulse wrench configured to generate a shock pulse on the main shaft when the seal portion is formed on the outer circumference of the main shaft and the seal portion formed on the outer circumferential surface of the main shaft. The seal part is formed.

In addition, the main shaft is formed at least two seals on the outer peripheral surface between the two blades.

The two seals of at least four seals of the liner and the two seals of at least two seals of the main shaft are all of the same shape and the shape is of a shape other than a straight line parallel to their axis. have. The two seal portions of the liner and the two seal portions of the main shaft coincide only once with one rotation of the liner.

The seal portion of the liner and main shaft is any shape other than a straight line parallel to the shaft core (usually, their seal portion is a straight line parallel to the shaft core of the liner or main shaft) but not a straight line parallel to the shaft core. Means that.

For example, the shape of the seal is inclined with respect to the axis along a plane parallel to the axis, a straight line curved in a V-shape or a W-shape, a curved shape curved in an arc or S-shape, and a stepped shape. It means to make a line shape bent at a right angle at least once.

In addition, the two seal portions of the liner and the two seal portions of the main shaft, which have a shape other than a straight line parallel to the axis, are all formed in the same shape and all overlap each other at the same time.

In this way, the two seals having a shape other than a straight line parallel to the axis of the liner during one rotation of the liner have the same shape and pass through two seal portions of the main shaft twice. They overlap each other as a whole, generating shock pulses. Because these four seal parts overlap each other only when each seal part touches the first time, and each seal part is formed to coincide as a whole, so that when the seal parts touch the second time and the second seal part touches each other, This is because the seal parts are opposite in shape to each other, and thus the seal parts facing each other do not coincide as a whole.

In this impulse wrench, the liner and the main shaft are coaxial, and the size of the seal formed by dividing by the seal portion formed on them and the outer end of the blade is equalized.

Therefore, since the volume of the high pressure chamber compressed at the time of torque generation is the same, the pressure generated in each high pressure chamber is equalized so that the weight balance of the liner is stable and rotational vibration does not occur.

This has a great effect on labor hygiene and countermeasures against disability.

In addition, since neither the seal portion of the liner nor the main shaft needs to be eccentric, it is easy to manufacture.

In addition, the impulse wrench has an even hydraulic pressure acting on the two blades to increase the inertia force of the rotation of the liner, a strong strike torque is obtained.

This increases the tightening torque by 30-50%.

The impulse wrench according to the second aspect of the present invention includes a main shaft inserted into the liner rotated by a motor and an inner liner and a groove formed in the main shaft and two grooves formed in the main shaft. There are two blades which are inserted so as to be protruded from each other and the outer end thereof is in contact with the inner circumferential surface of the liner, and the seal portion formed on the inner circumferential surface of the liner by rotating the liner is the outer circumferential surface of the main shaft. In a two-blade impulse wrench, which is configured to generate an impact pulse on the main shaft when the seal portion is formed at the outer end of the blade and the seal portion is formed on the liner, the liner forms at least four seal portions on an inner circumferential surface thereof. At least two seals on the outer circumferential surface between the two blades And dots that are the same as those of the impulse wrench, due to the characteristics of the above-described first.

However, the impulse wrench according to the second aspect of the present invention makes two of the at least four seal portions of the liner one of the at least two seal portions of the main shaft while simultaneously making one of the two seal portions parallel to the axis of the liner. One side of the seal portion is different in that it is straight in parallel with the axis of the main shaft.

The other side of the two seal portions of the liner and the other side of the two seal portions of the main shaft have a shape other than a straight line parallel to the shaft center, such as an impulse wrench according to the first aspect of the present invention.

In this way, the impact pulse can be generated only once between one rotation of the liner for the same reason as the impulse wrench according to the first aspect of the present invention described above.

The impulse wrench due to this second characteristic is one of the two seal parts of the liner and the main shaft described above, which is in a straight line shape parallel to the shaft center. Therefore, when these seal parts are matched, the thrust in the axial direction is 1. It becomes / 2.

As a result, the rotational resistance is also small. Furthermore, there is no need to eccentrically seal both the liner and the main shaft, and the volume of the high pressure chamber compressed at the time of torque generation is the same, so that the pressure generated on the two blades is equal, which is the same as the impulse wrench due to the first feature. .

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

In Fig. 1, reference numeral 1 denotes a latch body, 2 a motor rotating due to compressed air, 3 a hydraulic pulse generator for converting a rotational force of the motor 2 into a shock pulse by hydraulic pressure, 4) is a handle.

The lower part of the handle 4 is provided with an air supply port 5 and an exhaust port 6 for supplying compressed air to the motor 2, and an upper and a reverse rotation switching valve 7 and a throttle lever 8 are provided at the upper part. I install it.

The hydraulic pulse generator 3 described above rotates the liner 10 relative to the main shaft 11 by installing the liner 10 in the liner case 9 and inserting the main shaft 11 into the liner 10. This liner is made free and filled with hydraulic oil for generating torque in the liner 10 and sealed by the liner upper plate 12 and the liner lower plate 13 attached to both ends of the liner 10.

The liner case 9 and the liner 10 are interconnected and are rotated by the rotation of the motor 2.

The liner 10 has a cylindrical liner seal with an approximately oval cross section inside, as shown in FIGS. 5A-5D.

The main shaft 11 has two grooves 14 along the shaft center at positions symmetrical with respect to the shaft center, and the two blades 16 are sandwiched between the grooves 14 with springs 15 interposed therebetween.

When the liner 10 is rotated relative to the main shaft 11, both blades 16 are in contact with the outer end portion of the liner in contact with the inner surface of the liner having a substantially elliptical cross section at all times.

2 to 4 show the liner 10 and the main shaft 11 of the first embodiment of the present invention.

In this embodiment, two planes are formed on the outer circumferential surface of the main shaft 11 at positions rotated 90 degrees around the shaft center from the two groove portions 14 in parallel to the shaft center.

On these planes, one protruding line is inclined with respect to the shaft center, respectively, but as shown in FIG. 4, the two protruding lines are inclined by the same angle in the same direction.

The edge of this protruding line becomes the seal part (x) (y).

On the inner circumferential surface of the liner 10, four protruding lines that protrude inwardly are formed at positions corresponding to both ends of the major axis and the minor axis of the substantially elliptical cross section along the axis.

The two protruding lines on the long axis side are parallel to the axis of the liner 10, and the edges of the ends thereof are the seal portions (a) and (b), respectively.

In addition, the two protruding lines on the short axis side are inclined with respect to the shaft core along a plane parallel to the shaft center of the liner 10, but the inclination direction and the angle are the same as the protruding lines of the main shaft 11.

The tip edges of these two protruding lines each have a seal portion (c) (d).

Since the main shaft 11 is inserted in the liner 10 so that the shaft centers coincide with each other (to be the same axis), the inclined seal portions x and y of the main shaft 11 and the liner 10 When the inclined seal portions (c) and (d) are in contact with each other, their sealing directions coincide with each other so that each seal portion (c) (d) (x) (y) is matched over the entire length.

At this time, the seal portions (a) and (b) and the outer ends of the two blades 16 also coincide over the entire length. Therefore, at this time, the liner seal is divided into four threads because the entire seal portions (a) (b) (c) (d) are sealed.

The liner 10 has a hole 17 through which the output adjustment valve is inserted in parallel with the shaft center near the seal portion c, and a hole 17 into which both heads of the seal portion c are inserted. It has two guide holes 18 connected to each other. The output adjustment valve 19 is fitted in this fitting hole 17. In addition, the weight balance hole 20 is punctured at the position opposed to the hole 17 to be fitted with respect to the shaft center of the liner 10 to maintain the weight balance with the hole 17 to be fitted.

Next, the operation of the impulse wrench having the above configuration will be described.

When the compressed air is supplied to the motor 2 by the operation of the throttle lever 18, the motor 2 is rotated at high speed, and the liner case 9 and the liner 10 are rotated accordingly.

When the main shaft 11 is not loaded, the main shaft 11 is also rotated, but when the load is applied, the rotation of the main shaft 11 is stopped and only the liner case 9 and the liner 10 continue to rotate. . 5A to 5D show changes in the liner seal caused by the rotation of the liner 10 when the main shaft 11 is loaded and stopped.

Angles indicate the liner 10 rotated by 90 degrees, respectively.

The state of FIG. 5A is a state in which the impact force is generated due to the impulse pulse on the main shaft 11. In this state, the seal portions (a) (b) (c) (d) of the liner (10), the seal portions (x) (y) of the main shaft (11), and the outer end portions of the blades (16) have a total length. The liner seal is temporarily divided into four threads to form a high pressure chamber (H) and a low pressure chamber (L) on both sides of the two blades (16).

In addition, when the liner 10 rotates due to the rotation of the motor 2, the volume of the high pressure chamber H is reduced, so that the working oil is compressed to generate a high pressure momentarily. To the side.

In this way, the main shaft 11 passes momentarily through the two blades 16 to generate strong torque.

5B is a state in which the liner 10 is rotated 90 degrees after the torque is generated.

The liner chamber is connected to the high pressure chamber (H) and the low pressure chamber (L) formed with the seal portion (x) (y) therebetween to become a single chamber, and no torque is generated, and the liner 10 is a motor ( Rotate again with 2).

The state of FIG. 5C is rotated 180 degrees more than the time of striking while being rotated 90 degrees further from the state of FIG. 5D. At this time, the seal portions (c) and (y) and the seal portions (d) and (x) face each other, but each seal portion is reversed in an inclined direction and intersects in an x shape like the second degree. Therefore, there is no sealing between these seal portions, and no pressure change occurs, so that torque does not occur, and the liner 10 is rotated as it is.

The state of FIG. 5d is rotated 90 degrees again in the state of FIG. 5c and rotated 270 degrees from the time of striking. This state is substantially the same as the fifth degree and no torque is generated. When it rotates again from the state of FIG. 5d, it returns to the state of FIG. 5a, and seal part c (x), seal part d, and (y) match, respectively, as mentioned above, and the high pressure chamber H and the low pressure chamber were mentioned above. L is formed, and hitting force is generated again.

In this manner, even with both blades, only one striking force can be generated for one rotation of the liner 10.

6 to 9 show a second embodiment of this invention.

In this embodiment, one of the two protruding lines formed on the outer circumferential surface of the main shaft 11 is inclined in the same manner as in the first embodiment (see FIG. 3), while the other is shown in FIG. It becomes a straight line parallel to the axial center of (11).

Accordingly, one seal portion x is inclined with respect to the shaft center as in the first embodiment, while the other seal portion y is parallel to the shaft core.

In addition, as shown in FIGS. 8 and 9, the seal portion c at the shorter side of the four seal portions a, b, and c formed on the inner circumferential surface of the liner 10 is the main shaft 11. It is inclined at the same direction and angle as the inclined seal part x, and the other three seal parts (a) (b) (d) are parallel to the axial center.

Thus, in this embodiment, each seal portion is mated over its entire length only when the inclined seal portions x and c come into contact, sealingly dividing the liner seal into four.

When the liner 10 is rotated 180 ° so that the seal portion x comes into contact with the seal portion d, the seal portions x, (d) and seal portions y and (c) does not match, so there is no seal between these seals and the liner seal is only bisected by the two blades 16.

Therefore, even in this embodiment, even though there are two blades, the impact pulse can be generated only once for one rotation of the liner 10.

10 to 15 show that the seal portion x formed on the main shaft 11 has various shapes different from the inclined straight shape.

FIG. 10 is a curved shape of the seal portion x in a V shape, FIG. 11 is a curved shape in a W shape, FIG. 12 is a curved shape in an arc shape, and FIG. 13 is an S shaped wave shape. FIG. 14 is a perspective view of one step bent in a step shape at a central portion, and FIG. 15 is a perspective view of one bent up and down three times in a step shape.

As shown in the first embodiment, when the two seal parts x (y) are formed together in a shape other than a straight line parallel to the axis center of the main shaft 11, the seal parts x are formed as shown in FIGS. When it is set as one shape shown in the figure, the other seal part y is also made into the same shape. And only the seal part (c) (d) of the short axis side of the four seal parts (a) (b) (c) (d) of the liner 10 may be shaped like the seal part (x) (y) mentioned above. There is a need.

The seal portions (a) and (b) on the long axis side may be linear in parallel to the axis of the liner 10.

As in the above-described second embodiment, when only two seal portions x are formed in a shape other than a straight line parallel to the axis center of the main shaft 11, two seal portions c on the short axis side of the liner 10 are formed. One of (d) needs to be made the same shape as the seal part x, and the other three seal parts and the seal part y of the main shaft 11 have to be linear in parallel with the axis.

Further, in the above embodiment, the number of seal portions of the liner 10 and the main shaft 11 is at least four and two, respectively, but of course it may be more than this.

Claims (14)

A liner 10 that is rotated by the motor 2, a main shaft 11 that is inserted into the liner 10 so as to be rotatable on the same axis, and a main shaft 11 formed on the main shaft 11. There are two blades 16, each of which is inserted into the one or two groove portions 14 so that the outer end thereof is in contact with the inner circumferential surface of the liner 10, and the liner 10 Is rotated so that the seal portions (a, b, c, d) formed on the inner circumferential surface of the liner 10 are the seal portions (x, y) formed on the outer circumferential surface of the main shaft (11) and the outer end of the blade (16). In the two-blade impulse wrench, which causes the impact pulse to be generated on the main shaft 11 when it is matched, at least four seal parts (a, b, c, d,) on the inner circumferential surface of the liner 10 are provided. Is formed and at least on the outer circumferential surface between the two blades 16 of the main shaft 11. Two seal portions (x, y) are formed, two seal portions (c, d) of at least four seal portions (a, b, c, d) of the liner (10) and the main shaft (11). Of the at least two seal portions (x, y) of the two seal portions (x, y) are all the same shape, the shape is a shape other than a straight line parallel to their axis center, thus the liner 10 An impulse wrench, characterized in that the two seal portions (c, d) of the liner (10) and the two seal portions (x, y) of the main shaft (11) coincide once in one rotation. . 2. The liner (10) according to claim 1, wherein the liner (10) has four seal parts (a, b, c, d) and the main shaft (11) has two seal parts (x, y). Impulse wrench. The liner 10 has four seal portions a, b, c, and d formed at positions corresponding to both ends of the long axis and the short axis of the liner chamber having a substantially elliptical cross section. Impulse wrench, characterized in that the two seal portions (x, y) of the main shaft (11) are formed respectively in the center between the two blades (16) installed in a symmetrical position with respect to the shaft center. 4. The sealant (4) of claim 3, wherein the four seal parts (a, b, c, d) of the liner (10) are formed on the inner circumferential surface of the liner (10) with end edges of a line protruding along its axis. The two seal portions (x, y) of 11) is formed on the outer circumferential surface of the main shaft (11) with the end of the end of the line protruding along the axis. The two seals (c, d) of the liner (10) and the two seals of the main shaft (11) according to any one of claims 1 to 4, having a shape other than straight, parallel to the axis. An impulse wrench, characterized in that the portions (x, y) are in a straight line inclined with respect to the axis along a plane parallel to their axis. The two said seals (c, d) of said liner (10) and said main seal (11) of any one of claims 1 to 4, wherein said two seals (c, d) of said liner (10) are in a shape other than straight, parallel to the axis center. An impulse wrench, characterized in that the portions (x, y) are bent at least once along a plane parallel to their axis. 5. The seal according to any one of claims 1 to 4, wherein the two seal portions (c, d) of the liner (10) and the two main seals (11) of the main shaft (11) are in a shape other than straight, parallel to the axis center. Impulse wrench, characterized in that the curve (x, y) is curved one or more times along a plane parallel to their axis. A liner 10 that is rotated by the motor 2, a main shaft 11 inserted into the liner 10 so as to be rotatable in the same axis, and two formed on the main shaft 11. There are two blades 16 inserted into the groove portions 14 of the grooves 14 or having their outer ends in contact with the inner circumferential surface of the liner 10. Seals (a, b, c, d) formed on the inner circumferential surface of the liner 10 and the outer ends of the blade (x, y) and the blade 16 formed on the outer circumferential surface of the main shaft 11 In the two-blade impulse wrench, which generates an impact pulse on the main shaft when it is matched with the part, at least four seal parts (a, b, c, d) are formed on the inner circumferential surface of the liner 10. At the same time on the outer circumferential surface between the two blades 16 of the main shaft 11 Seal portions (x, y) are formed and one (d) of the two seal portions (c, d) of the at least four seal portions (a, b, c, d) of the liner (10) and the main One of the at least two seal portions (x, y) of the shaft (11) is a straight line parallel to their axis, and the other (c) of the two seal portions (c, d) of the liner (10) ) And the other sides (x) of the two seal portions (x, y) of the main shaft (11) are the same shape, and the shape is a shape other than a straight line parallel to their axis center, and thus the liner (10) Impulse characterized in that the two seal parts (c, d) of the liner 10 and the two seal parts (x, y) of the main shaft 11 to be matched only once for one rotation of wrench. 9. The liner (10) of claim 8, wherein the liner (10) has four seal parts (a, b, c, d), and the main shaft (11) has two seal parts (x, y). Impulse wrench. 10. The method of claim 9, wherein the four seal parts (a, b, c, d) of the liner 10 are formed at positions corresponding to both ends of the long axis and the short axis of the liner chamber having a substantially elliptical cross section, respectively, Two seal portions (x, y) of the shaft (11) are formed respectively in the center between the two blades (16) installed in a symmetrical position with respect to the axis of the impulse wrench. The liner (10) of claim 10, wherein the four seal parts (a, b, c, d) of the liner (10) are formed at the end of the line protruding along the axis of the inner peripheral surface of the liner (10) and the main shaft (11). The two seal portions (x, y) of the impulse wrench, characterized in that formed on the end of the end of the line protruding along the axis of the outer peripheral surface of the main shaft (11). 12. The seal portion of the other line portion c of the liner 10 and the other seal portion of the main shaft 11, according to any one of claims 8 to 11, having a shape other than a straight line parallel to the axis center. An impulse wrench, characterized in that (x) is a straight line inclined with respect to the axis along a plane parallel to their axis. 12. The seal part on the other side of the liner 10 and the other seal portion on the other side of the main shaft 11 according to any one of claims 8 to 11. An impulse wrench, wherein (x) consists of a line that is bent one or more times along a plane parallel to their axis. 12. The other seal portion c of the liner 10 and the other seal portion of the main shaft 11 according to any one of claims 8 to 11, wherein the other seal portion c of the liner 10 has a shape other than a straight line parallel to the axis center. impulse wrench, characterized in that (x) is curved at least once along a plane parallel to their axis.

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