JP4801888B2 - Stroke wrench - Google Patents

Description

  The present invention relates to a striking torque wrench having a small striking sound and capable of obtaining a stable high torque by generating one striking per one rotation of a liner.

2. Description of the Related Art Conventionally, in a striking torque wrench, a striking force is generated by a mechanical method using the rotational force of a rotor, and converted to a desired torque using this.
However, in the method of obtaining the hitting torque by a mechanical method, the hitting sound is large, causing noise pollution, and the vibration due to the hitting is also large.

In order to cope with this, a torque wrench that uses hydraulic pressure as a method for obtaining a striking torque and prevents noise and vibration is promising and has been developed.
Examples of the hydraulic torque wrench include a main shaft provided with one blade and a plurality of blades (for example, see Patent Documents 1 and 2). However, in the case of a hydraulic torque generator, it is enclosed. As the oil pressure of the oil increases, a precise sealing mechanism is required and the manufacturing cost increases, and there is a problem that the torque generated due to the temperature change of the oil due to the influence of friction and oil pressure varies.
Japanese Patent Publication No.41-5800 Japanese Utility Model Publication No. 1-29012

  An object of the present invention is to provide a striking torque wrench capable of obtaining a stable high torque with a small striking sound in view of the problems of the conventional striking torque wrench and hydraulic torque wrench. And

  In order to achieve the above object, a striking torque wrench according to the present invention includes a liner having a cavity and a protrusion that is rotated by a rotor and in which oil is sealed, and a main shaft that is coaxially disposed inside the liner. A striking torque wrench comprising a driving blade that is arranged so as to be able to project and retract on the main shaft and that directly contacts the projecting portion of the liner to transmit the rotational force of the liner to the main shaft. A cam is formed, and a pin to be inserted and guided into a grooved cam is projected on the end face of the driving blade so that the driving blade protrudes periodically according to the relative rotation with respect to the main shaft of the liner. It is characterized by that.

  In this case, when the driving blade comes into contact with the protruding portion of the liner, the opening of the driving blade insertion groove of the main shaft into which the driving blade is inserted is sealed by the driving blade, and the inside of the driving blade insertion groove is inside the high-pressure chamber. Can be formed.

  Further, the inside of the driving blade insertion groove forming the high pressure chamber and the cavity of the liner can be communicated with each other via an output adjusting mechanism.

  The driving blade may protrude once per rotation relative to the main axis of the liner.

  According to the striking torque wrench of the present invention, a liner having a cavity and a protrusion that is rotated by a rotor and encloses oil therein, a main shaft that is coaxially disposed inside the liner, and a protrusion and a protrusion in the main shaft In a striking torque wrench comprising a driving blade that is arranged so as to be capable of transmitting the rotational force of the liner directly to the main shaft by contacting the protruding portion of the liner, a grooved cam is formed on the bottom surface of the liner. A rotor is provided by projecting a pin to be inserted and guided into a grooved cam on the end face of the driving blade, and projecting the driving blade periodically according to relative rotation with respect to the main shaft of the liner. Due to the action of oil sealed inside the cavity, the impact sound generated when the driving blade comes into contact with the protrusion of the liner is reduced. In addition, energy efficiency is reduced due to the fact that the rotational force of the liner is directly transmitted to the main shaft via the driving blade, resulting in less energy loss and less oil temperature change due to the effects of friction and hydraulic pressure. A stable and high torque can be obtained.

  Further, when the driving blade comes into contact with the protruding portion of the liner, the opening of the driving blade insertion groove of the main shaft into which the driving blade is inserted is sealed by the driving blade, and the inside of the driving blade insertion groove forms a high-pressure chamber. By doing so, the internal pressure of the high pressure chamber acts as the back pressure of the driving blade, maintaining the state where the driving blade abuts against the protruding portion of the liner, and ensuring that the rotational force of the liner is applied to the main shaft via the driving blade. Can communicate.

  Further, by connecting the inside of the driving blade insertion groove forming the high-pressure chamber and the cavity of the liner via an output adjusting mechanism, the driving blade acts as a back pressure of the driving blade, and the driving blade functions as a protruding portion of the liner. It is possible to adjust the magnitude of the internal pressure of the high-pressure chamber that maintains the state in contact with the torque wrench, thereby adjusting the output of the torque wrench itself.

  By causing the driving blade to protrude once per rotation relative to the main axis of the liner, a large output can be obtained even with a small apparatus.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a striking torque wrench according to the present invention will be described below based on the drawings.

1 to 8 show an embodiment of a striking torque wrench according to the present invention.
This striking torque wrench is rotated by a rotor (not shown) of a drive source such as an air motor or an electric motor, and has a cavity 2a in which oil is sealed and a plurality (two in this embodiment) of protrusions. A liner 2 having a portion 2b, a main shaft 1 coaxially disposed inside the liner 2, and a main shaft 1 that can be projected and retracted. A plurality of (two in the present embodiment) driving blades 3 that directly transmit to the main shaft 1 are formed. Groove-shaped cams 2c and 2e are formed on the bottom surface of the liner 2, and grooves are formed on the end surface of the driving blade 3. Pins 3a to be inserted and guided in the cams 2c and 2e are projected, and a plurality of driving blades 3 are regularly projected according to the relative rotation of the liner 2 with respect to the main shaft 1. There.

In this case, when the driving blade 3 comes into contact with the protruding portion 2b of the liner 2, the opening of the driving blade insertion groove 1a of the main shaft 1 into which the driving blade 3 is inserted is sealed by the driving blade 3 (see FIG. 2). The inside of the driving blade insertion groove 1a forms a high-pressure chamber (the portion B shown by shading shown in FIG. 3).
As a result, the internal pressure of the high-pressure chamber inside the driving blade insertion groove 1a acts as the back pressure of the driving blade 3, and maintains the state in which the driving blade 3 is in contact with the protruding portion 2b of the liner 2, thereby reducing the rotational force of the liner 2. It is possible to reliably transmit to the main shaft 1 via the driving blade 3.

As shown in FIG. 6, the liner 2 has a bottom surface thereof, specifically, an inner surface of a liner bottom lid 2 d on the proximal end side of the main shaft 1, a side portion of the driving blade insertion groove 1 a and a cavity 2 a of the liner 2. A concave portion 2f is formed so that the side portion of the liner 2 communicates periodically with the rotation of the liner 2 relative to the main shaft 1.
Thereby, the movement of the driving blade 3 along the grooved cams 2c and 2e after the contact of the liner 2 with the protruding portion 2b is released (after passing through the protruding portion 2b) can be smoothly performed. .

The interior of the driving blade insertion groove 1a forming the high-pressure chamber and the cavity 2a of the liner 2 are communicated with each other via a communication hole 1c formed in the main shaft 1 and an output adjusting mechanism 4 disposed in the communication hole 1c. Yes.
The output adjustment mechanism 4 is configured to be able to adjust the opening amount of the communication hole 1c by being rotated by an operation tool (not shown) inserted from the distal end side of the main shaft 1.
Thereby, the magnitude of the internal pressure of the high-pressure chamber that acts as a back pressure of the driving blade 3 and maintains the state in which the driving blade 3 abuts against the protruding portion 2b of the liner 2 can be adjusted. The output can be adjusted.

An accumulator 5 is disposed at the base end portion of the main shaft 1.
This accumulator 5 is for adjusting the internal pressure of the oil sealed in the cavity 2a, and thereby absorbs fluctuations in the internal pressure of the oil sealed in the cavity 2a due to oil temperature change or oil leakage. To be able to.

A circumferential groove 1 b is formed on the outer peripheral surface covered with the bottom of the liner 2 on the tip side of the main shaft 1.
The circumferential groove 1b absorbs the internal pressure of the high-pressure chamber inside the driving blade insertion groove 1a that periodically becomes high pressure by the circumferential groove 1b (specifically, the high-pressure oil leaked from the high-pressure chamber is absorbed by the circumferential groove 1b. The internal pressure of the high pressure chamber does not directly act on the O-ring 6 disposed on the outside of the cavity 2a (low pressure chamber) through the groove 1d formed on the surface of the main shaft 1. As a result, oil leakage due to wear of the O-ring 6 can be reliably prevented.

By the way, in this embodiment, a grooved cam 2c formed on the bottom surface of the liner 2, specifically, the inner surface of the bottom of the liner 2 on the front end side of the main shaft 1, and a liner bottom lid 2d on the base end side of the main shaft 1 are provided. The groove-shaped cam 2e formed on the inner surface of each of the two blades is formed with a phase difference of 180 °, and a groove is formed on the left end surface (see FIG. 1 (1)) of one of the two driving blades 3. A pin 3a to be inserted and guided into the cam 2c and a pin 3a to be inserted and guided into the grooved cam 2e on the right end surface (see FIG. 1 (1)) of the other driving blade 3 are provided in a projecting manner. The individual driving blades 3 can be protruded once per rotation relative to the main shaft 1 of the liner 2.
Thus, the driving blade 3 can be brought into contact with the protruding portion 2b of the liner 2 once per rotation relative to the main shaft 1 of the liner 2, and a large output can be obtained even with a small device. Can do.

In addition, as in the first modification of the present embodiment shown in FIG. 9, the pins 3a inserted and guided in the groove-like cams 2c and 2e are protruded from the left and right end surfaces of the driving blade 3, and correspondingly, A grooved cam 2c formed on the bottom surface of the liner 2, specifically, the inner surface of the bottom of the liner 2 on the distal end side of the main shaft 1, and a grooved cam formed on the inner surface of the liner bottom lid 2d on the base end side of the main shaft 1. 2e can be formed in the same shape that protrudes twice (or three times or more) per rotation relative to the main shaft 1 of the liner 2, for example.
Accordingly, the driving blade 3 can be brought into contact with the protruding portion 2 b of the liner 2 twice (or three times or more) per one rotation relative to the main shaft 1 of the liner 2.

Further, as in the second modification of the present embodiment shown in FIG. 10, the number of driving blade insertion grooves 1a formed in the main shaft 1 into which the driving blade 3 is inserted may be one (or three or more). it can.
As a result, the number of times of rotation of the liner 2 relative to the main shaft 1 is arbitrary (corresponding to the number of protrusions 2b formed on the liner 2 and the shape of the grooved cams 2c and 2e), and the driving blade 3 of the liner 2 It can be brought into contact with the protruding portion 2b.

Next, the operation of this striking torque wrench will be described.
First, when a rotor (not shown) of a drive source such as an air motor or an electric motor is started, the liner 2 rotates in conjunction with the rotor.
As the liner 2 rotates, the inside of the liner 2 changes as shown in FIG. 1 (2) → (3) → (4) → (2).
Here, FIG. 1 (2) shows a state in which the driving blade 3 is submerged in the driving blade insertion groove 1a formed on the main shaft 1, and FIG. 1 (3) shows that the driving blade 3 is in the grooved cams 2c, 2e. FIG. 1 (4) shows a state in which the driving blade 3 is projected from the driving blade insertion groove 1a formed on the main shaft 1, and a state in which the driving blade 3 protrudes from the driving blade insertion groove 1a formed on the main shaft 1. A state in which an impact torque is generated on the main shaft 1 by abutting against the protruding portion 2b (a state in which the rotational force of the liner 2 is transmitted to the main shaft 1) is shown.

As shown in FIG. 1 (4), when the driving blade 3 is in contact with the protruding portion 2 b of the liner 2, the opening of the driving blade insertion groove 1 a of the main shaft 1 into which the driving blade 3 is inserted is formed by the driving blade 3. It is sealed (sealed at a portion A shown in FIG. 2), and the inside of the driving blade insertion groove 1a forms a high-pressure chamber (a portion B shaded in FIG. 3).
As a result, the internal pressure of the high-pressure chamber inside the driving blade insertion groove 1a acts as the back pressure of the driving blade 3, and maintains the state in which the driving blade 3 is in contact with the protruding portion 2b of the liner 2, thereby reducing the rotational force of the liner 2. It is possible to reliably transmit to the main shaft 1 via the driving blade 3.
And the magnitude | size of the internal pressure of the high pressure chamber which acts as a back pressure of the driving blade 3 and maintains the state where the driving blade 3 abuts against the protruding portion 2b of the liner 2 can be adjusted by the output adjusting mechanism 4, thereby The output of the torque wrench itself can be adjusted.

  In FIG. 1, the case where the liner 2 is rotated to the right has been described. However, the liner 2 can also be rotated counterclockwise as shown in FIG. Can be tightened and loosened using a single impact torque wrench.

  The hitting torque wrench of the present invention has been described based on the embodiment thereof, but the present invention is not limited to the configuration described in the above embodiment, and the configuration is appropriately set within the scope not departing from the gist thereof. It can be changed.

  The striking torque wrench of the present invention can be suitably used for a striking torque wrench that uses an air motor or an electric motor as a drive source because it has a small striking sound and provides a stable high torque.

1 shows an embodiment of a striking torque wrench according to the present invention, wherein (1) is a front sectional view, and (2) to (4) are XX sectional views of (1) (an explanatory diagram showing changes inside the liner). It is. It is explanatory drawing which shows the state which the driving blade contact | abutted to the protrusion part of the liner. It is explanatory drawing which shows a high pressure chamber. The main shaft is shown, (1) is a front view, (2) is a front sectional view, and (3) is a sectional view taken along line XX of (2). A liner is shown, (1) is front sectional drawing, (2) is a side view. The liner bottom cover is shown, (1) is a side view and (2) is a front sectional view. 1 shows a driving blade, (1) is a left side view of one driving blade, (2) is the same front view, (3) is a front view of the other driving blade, and (4) is a right side view thereof. The state which reversely rotated the liner (left rotation) is shown, (1) is front sectional drawing, (2) is XX sectional drawing of (1). The driving blade of the 1st modification of the Example of the impact type torque wrench of this invention is shown, (1) is a left view, (2) is a front view, (3) is a right view. The main axis | shaft of the 2nd modification of the Example of the impact type torque wrench of this invention is shown, (1) is front sectional drawing, (2) is a right view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main shaft 1a Driving blade insertion groove 1b Circumferential groove 1c Communication hole 1d Groove 2 Liner 2a Cavity 2b Projection 2c Groove cam 2d Liner bottom cover 2e Groove cam 2f Recess 3 Driving blade 3a Pin 4 Output adjustment mechanism

Claims (4)

  A liner having a cavity and a protrusion that is rotated by a rotor and in which oil is enclosed, a main shaft that is coaxially disposed inside the liner, a protrusion that can be projected and retracted on the main shaft, and a protrusion of the liner In a striking torque wrench comprising a driving blade that directly transmits the rotational force of the liner to the main shaft by abutting on the groove, a groove cam is formed on the bottom surface of the liner, and a groove cam is formed on the end surface of the driving blade. A striking torque wrench characterized in that a pin to be inserted and guided is protruded, and the driving blade is periodically protruded according to relative rotation with respect to the main shaft of the liner.   When the driving blade comes into contact with the protrusion of the liner, the opening of the driving blade insertion groove of the main shaft into which the driving blade is inserted is sealed by the driving blade so that the inside of the driving blade insertion groove forms a high-pressure chamber. The striking torque wrench according to claim 1, wherein   The striking torque wrench according to claim 2, wherein the inside of the driving blade insertion groove forming the high pressure chamber and the cavity of the liner are communicated with each other via an output adjusting mechanism.   4. The striking torque wrench according to claim 1, wherein the driving blade is projected once per rotation relative to the main shaft of the liner.

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