JP2010280029A - Oil pulse tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil pulse tool capable of preventing a drop in output torque when a body is pushed against a screw or a failure in starting a motor. <P>SOLUTION: A bearing 17 for holding a main shaft 12 rotatable to a housing 10 is provided on a front outer part of the housing 10, and a retaining ring 18 is provided in a groove formed on an outer peripheral part of the main shaft 12 forward of the bearing 17. Thus, when an operator pushes an oil pulse screwdriver 1 toward a screw 16, the main shaft 12 moves backward by load applied via a material 21 to be screwed, the screw 16 and a tip tool 15, but the retaining ring 18 comes against the bearing 17 via a washer 19. Therefore, slide resistance between the main shaft 12 and a liner upper plate 132 rotated by the motor 11 can be prevented from increasing. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil pulse tool including an oil pulse mechanism that is rotationally driven by a motor and generates impact torque.

  An example of a motor-driven hydraulic fastening tool having an oil pulse mechanism is an oil pulse driver. For example, as shown in Patent Document 1, this oil pulse driver is rotationally driven by a motor, filled with oil inside and sealed, a main shaft fitted and inserted coaxially with the liner, and a main shaft And two blades that are urged in the outer circumferential direction to come into contact with the inner circumference of the liner. When the liner rotates while the main shaft is stopped due to a load, the chamber formed in the liner is sealed by the blade, so that the oil pressure in the chamber rises rapidly. An impact in the rotational direction is applied to the shaft.

  As described above, the oil pulse driver has a structure in which an impact is generated by the pressure of the oil enclosed in the liner, and the impact sound during operation is smaller than that of an impact driver equipped with a mechanical impact mechanism. The feature is that it can reduce noise.

  However, when a screw having a cross hole is tightened with an oil pulse driver, there is a drawback that the tip of the bit rides up and easily comes off from the cross hole compared to an impact driver. This is because the impact torque generated by the oil pulse mechanism has a lower peak value than the impact torque of the impact mechanism, but the duration of the torque is long, so the bit fitted in the cross hole while the bit is torqued. This is because the tip of the rod gradually climbs up the slope of the cross hole and the fitting is disengaged. Therefore, when using an oil pulse driver, the operator needs to press the driver body against the screw with a load stronger than that of the impact driver to prevent the bit from coming off the cross hole.

  However, the conventional oil pulse driver has a structure in which the main shaft and the upper plate of the liner are in contact with each other in order to seal the oil. Therefore, when the operator applies a load with the driver body directed toward the screw, the main shaft is pressed against the upper plate of the liner, and the sliding resistance between the main shaft and the upper plate increases. For this reason, the number of rotations of the motor connected to the upper plate is reduced, and problems such as a motor start failure and a reduction in output torque are caused.

JP 2005-40881 A

  The present invention has been made in view of such problems, and provides an oil pulse tool that prevents an increase in sliding resistance between a main shaft and a liner upper plate when the main body is pressed against a screw. With the goal.

In order to achieve the above object, an oil pulse tool according to the first aspect of the present invention includes:
A motor,
An oil pulse mechanism that is rotationally driven by the rotation of the motor;
A main shaft for outputting the oil pulse mechanism,
A tip tool holding portion connected to the main shaft;
An abutting portion provided on the main shaft and abutting against the housing;
It is characterized by providing.

Further, a bearing provided on the housing and rotatably holding the main shaft,
The abutting portion may abut against the bearing.

The main shaft has a protruding portion protruding from the housing,
The bearing may hold the protrusion.

In order to achieve the above object, an oil pulse tool according to the second aspect of the present invention comprises:
A motor,
An oil pulse mechanism that is rotationally driven by the rotation of the motor;
A main shaft for outputting the oil pulse mechanism,
A tip tool holding portion connected to the main shaft;
A regulating member for regulating the backward movement of the main shaft;
It is characterized by providing.

  The restricting member may be provided on the main shaft.

In order to achieve the above object, an oil pulse tool according to the third aspect of the present invention provides:
A motor,
An oil pulse mechanism that is rotationally driven by the rotation of the motor;
A main shaft for outputting the oil pulse mechanism,
A tip tool holding portion connected to the main shaft;
A load receiving portion for receiving a load applied to the main shaft;
It is characterized by providing.

The load receiving portion is
A bearing held in the housing and connected to the housing behind it;
A load receiving member held by the main shaft and connected to the bearing behind the main shaft;
May be provided.

  According to the configuration of the first aspect, since the abutting portion of the main shaft abuts against the housing, an increase in sliding resistance between the liner and the main shaft can be prevented.

  With the configuration according to the second aspect, since the abutting portion abuts against the inner ring of the bearing, the frictional resistance between the abutting portion and the bearing can be made extremely small.

  With the configuration according to the third aspect, the manufacturing cost can be reduced.

  According to the configuration of the fourth aspect, since the regulating member regulates the backward movement of the main shaft, an increase in the sliding resistance between the liner and the main shaft can be prevented.

  According to the configuration of the fifth aspect, the manufacturing cost can be reduced.

  According to the configuration of the sixth aspect, since the load receiving portion receives a load applied to the main shaft, an increase in sliding resistance between the liner and the main shaft can be prevented.

  With the configuration according to the seventh aspect, the manufacturing cost can be reduced. Further, it is possible to prevent the bearing from coming out from the front when the load receiving portion receives a load.

It is a fragmentary sectional view showing the working state of the oil pulse driver concerning the embodiment of the present invention. It is a partially expanded sectional view showing the working state of the oil pulse driver which concerns on embodiment of this invention. It is a perspective view showing the surface where the main shaft and liner upper plate which concern on embodiment of this invention contact. (A) is a partially expanded sectional view showing the working state of the conventional oil pulse driver, (b) is an enlarged view of a bearing peripheral portion when the main shaft moves rearward in (a). FIG. 3 is an enlarged view of the periphery of the bearing when the main shaft moves forward in FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The oil pulse driver 1 of this embodiment is comprised from the housing 10, the motor 11, the main shaft 12, the oil pulse mechanism part 13, and the tool attachment part 14, as shown with a fragmentary sectional view in FIG. The

  The housing 10 is formed in a T shape when viewed from the side, and includes a motor 11, an oil pulse mechanism portion 13, and one end portion of the main shaft 12. A trigger switch 103 is provided at an end portion of the handle portion 102 extending from the body portion 101 at a substantially right angle on the body portion 101 side, and a rechargeable battery 104 is detachably attached to the other end portion.

  As shown in FIG. 2, the housing 10 further includes a hammer case 105, a cover 106, and a cap 107 provided in front of the body portion 101 (the lower side in FIG. 2 is assumed to be the front, hereinafter the same). The hammer case 105 accommodates the oil pulse mechanism unit 13. The cover 106 is provided so as to cover the hammer case 105. The cap 107 is made of rubber having elasticity, and prevents the cover 106 from being pulled forward.

  Returning to FIG. 1, the motor 11 is built in the rear portion of the body portion 101 of the housing 10. In the motor 11, the rotation of the motor 11 changes depending on the amount that the operator pulls the trigger switch 103. A gear is disposed in front of the motor 11, and the rotation of the motor 11 is transmitted to the oil pulse mechanism unit 13 through the gear.

  The main shaft 12 transmits the torque generated by the oil pulse mechanism 13 to the screw 16 via a tip tool 15 (bit) attached to the tool attachment 14. As shown in an enlarged view in FIG. 2, the portion of the main shaft 12 that protrudes from the housing 10 is rotatably held by a bearing 17 that is held by a hammer case 105. One end of the rear side of the main shaft 12 is disposed coaxially with the liner 131 in a liner 131 described later. Further, at one end portion of the main shaft 12 disposed in the liner 131, two blade insertion grooves 121 for inserting a blade 133 to be described later in the axial direction and the blade 133 are urged in the outer diameter direction. A spring insertion hole 122 for inserting the spring 134 is formed.

  A retaining ring fitting groove 123 into which the retaining ring 18 is fitted is formed on the outer periphery of the main shaft 12 in front of the bearing 17. The retaining ring 18 forms an abutting portion that abuts against the bearing 17 via the washer 19 when the main shaft 12 receives a load. The washer 19 is provided between the retaining ring 18 and the bearing 17, and the surface facing the bearing 17 is in contact with the inner ring of the bearing 17.

  A seat 20 is provided on the outer peripheral portion of the main shaft 12 between the front surface of the oil pulse mechanism 13 and the inner peripheral surface of the housing 10. The sheet 20 is formed of a soft material having elasticity such as vinyl or rubber, and is provided to reduce friction when the liner 131 and the housing 10 contact each other as shown in FIG.

  Further, as shown in FIG. 3, the main shaft 12 and a liner upper plate 132 to be described later have contact surfaces 12a and 132a (shaded portions in FIG. 3), respectively. The contact surfaces 12a and 132a are in contact with each other to seal the oil inside the liner 131. Therefore, when the main shaft 12 rotates relative to the liner 131, a sliding resistance is generated between the contact surfaces 12a and 132a.

  Returning to FIG. 2, the oil pulse mechanism 13 includes a liner 131, a liner upper plate 132, a blade 133, and a spring 134. The rotation of the motor 11 is transmitted to the liner 131 via a liner upper plate 132 disposed on the rear side of the gear and the liner 131. Inside the liner 131, there are two blades 133 inserted into a blade insertion groove 121 formed in the main shaft 12 and urged in the outer peripheral direction by a spring 134 inserted into the spring insertion hole 122 of the main shaft 12. It is in contact with the inner periphery of the liner 131.

  The tool attachment portion 14 is provided at one end portion that protrudes from the housing 10 of the main shaft 12, and includes a sleeve 141 and a steel ball 142. A steel ball 142 is inserted into a hole formed in the side surface of the main shaft 12, and a sleeve 141 provided on the outer peripheral portion of the main shaft 12 is moved to release / restrict the movement of the steel ball 142, so that the tip tool 15 is attached and detached. A skirt portion 143 is formed at a portion of the sleeve 141 facing the retaining ring 18 so as to cover the outer periphery of the retaining ring 18. Since the difference between the outer diameter of the retaining ring 18 and the inner diameter of the skirt portion 143 is smaller than the depth of the retaining ring fitting groove 123, the position where the sleeve 141 restricts the movement of the steel ball 142, that is, the tip tool 15 is placed on the main shaft 12. When the sleeve 141 is positioned at the position to be held at the position (the state of FIG. 2), the retaining ring 18 is restricted from moving by the skirt portion 143 and cannot be removed from the retaining ring fitting groove 123.

  An outline of the operation of the oil pulse driver 1 configured as described above will be described. When the operator operates the trigger switch 103, electricity is supplied from the battery 104 to the motor 11, and the motor 11 is rotationally driven. The driving force of the motor 11 is transmitted to the oil pulse mechanism unit 13 through a gear. Since the liner 131 of the oil pulse mechanism unit 13 is filled with oil, when the main shaft 12 is not loaded or when the load is small, the main shaft 12 rotates the motor, that is, the liner, due to the oil resistance. It rotates in synchronization with the rotation of 131. Further, when a heavy load is applied to the main shaft 12, the rotation of the main shaft 12 stops, and only the outer liner 131 continues to rotate. When the blade 133 reaches the seal portion formed on the inner peripheral surface of the liner 131 by the rotation of the liner 131, the oil flow is momentarily blocked and the oil pressure rapidly rises. Then, a rotational torque is applied to the main shaft 12 via the blade 133 by the pressure, the main shaft 12 rotates against a load, and the power transmission from the liner 131 to the main shaft 12 is made shockingly. The screw 16 is tightened by this shocking torque.

  Here, when the screw 16 is tightened by the oil pulse driver 1, the operator needs to perform work while applying a load from above with the tip tool 15 of the oil pulse driver 1 fitted in the cross hole of the screw 16. There is. The transmission of the load at this time will be described below with reference to FIGS.

  A load that the operator presses the oil pulse driver 1 toward the screw 16, that is, in the direction of arrow A in FIG. 2, is transmitted to the main shaft 12 via the threaded material 21, the screw 16, and the tip tool 15. . The load received by the main shaft 12 is transmitted to a retaining ring 18 and a washer 19 corresponding to the load receiving portion described in claim 6. Further, the load is transmitted to the bearing 17 and received by the housing 10. At this time, the main shaft 12 receives a load and moves rearward, so that the retaining ring 18 and the washer 19 corresponding to the abutting portion according to claim 1 abut against the bearing 17. Therefore, the rearward movement of the main shaft 12 is restricted by a retaining ring 18 corresponding to the restriction member described in claim 4. Therefore, even if the contact surface 12a of the main shaft 12 shown in FIG. 3 is in contact with the contact surface 132a of the liner upper plate 132, it is not pressed with full load. In this way, an increase in sliding resistance between the contact surface 12a and the contact surface 132a that occurs when the main shaft 12 rotates relative to the liner 131 can be prevented. And, without giving resistance to the rotation of the motor 11, it is possible to reduce the rotation failure of the motor 11, the reduction of the hitting torque and the occurrence of the hitting failure.

  In the conventional oil pulse driver, a bearing 37 is provided inside the housing 30 as shown in FIG. Therefore, when the main shaft 32 receives a load and moves rearward, the bearing 37 comes out toward the liner 331 as shown in FIG. 4B, and the inner ring of the bearing 37 and the liner 331 come into contact via the seat 40. there is a possibility. In this case, since the main shaft 32 and the liner 331 having different rotational speeds both come into contact with the inner ring of the bearing 37, there is a possibility that resistance is generated in the rotation of the main shaft 32 during the tightening operation, and the tightening torque is reduced. However, in the oil pulse driver 1 according to the embodiment of the present invention, since the bearing 17 is provided outside the housing 10 as shown in FIG. 2, even if the main shaft 12 moves rearward due to a load, the bearing 17 Hits the housing 10. Accordingly, it is possible to prevent a decrease in the tightening torque due to the contact between the liner 131 and the inner ring of the bearing 17 during the tightening operation.

  When the main shaft 12 moves to the front of the housing 10, for example, when the oil pulse driver 1 is pulled rearward with the tip tool 15 biting on the screw 16, the main shaft 12 contacts the front surface of the liner 131. As shown in FIG. 5, the liner 131 abuts against the inner wall of the housing 10 via the seat 20. Therefore, the forward movement of the main shaft 12 is restricted and the movement of the bearing 17 is restricted by the retaining ring 18 via the washer 19, so that the bearing 17 does not fall out toward the front of the housing 10. In this case, the housing 10 is in contact with the liner 131, but since it is after the tightening operation is completed, it is not necessary to consider a decrease in the tightening torque.

  Further, in the conventional oil pulse driver, since the bearing 37 is provided inside the housing 30 as shown in FIGS. 4A and 4B, it is difficult to process and assemble the bearing insertion portion. In the oil pulse driver 1 according to the embodiment of the present invention, since the bearing 17 is provided outside the housing 10 and at a shallow position at the front end portion, the bearing insertion portion can be easily processed and assembled. it can.

DESCRIPTION OF SYMBOLS 1 Oil pulse driver 10 Housing 101 Body part 102 Handle part 103 Trigger switch 104 Battery 105 Hammer case 106 Cover 107 Cap 11 Motor 12 Main shaft 121 Blade insertion groove 122 Spring insertion hole 123 Retaining ring fitting groove 12a Contact surface 13 Oil pulse mechanism Part 131 Liner 132 Liner upper plate 132a Contact surface 14 Tool mounting part 141 Sleeve 142 Steel ball 143 Skirt part 15 Tip tool 16 Screw 17 Bearing 18 Retaining ring 19 Washer 20 Seat 21 Threaded material 30 Housing 32 Main shaft 331 Liner 37 Bearing 40 seats

Claims (7)

A motor,
An oil pulse mechanism that is rotationally driven by the rotation of the motor;
A main shaft for outputting the oil pulse mechanism,
A tip tool holding portion connected to the main shaft;
An abutting portion provided on the main shaft and abutting against the housing;
An oil pulse tool comprising: A bearing provided on the housing and rotatably holding the main shaft;
The abutting portion abuts against the bearing;
The oil pulse tool according to claim 1. The main shaft has a protruding portion protruding from the housing,
The bearing holds the protrusion;
The oil pulse tool according to claim 2, wherein the oil pulse tool is provided. A motor,
An oil pulse mechanism that is rotationally driven by the rotation of the motor;
A main shaft for outputting the oil pulse mechanism,
A tip tool holding portion connected to the main shaft;
A regulating member for regulating the backward movement of the main shaft;
An oil pulse tool comprising: The restriction member is provided on the main shaft.
The oil pulse tool according to claim 4. A motor,
An oil pulse mechanism that is rotationally driven by the rotation of the motor;
A main shaft for outputting the oil pulse mechanism,
A tip tool holding portion connected to the main shaft;
A load receiving portion for receiving a load applied to the main shaft;
An oil pulse tool comprising: The load receiver is
A bearing held in the housing and connected to the housing behind it;
A load receiving member held by the main shaft and connected to the bearing behind the main shaft;
The oil pulse tool according to claim 6, further comprising:

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