JP2009196074A - Oil pulse driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve cooling efficiency, to simplify a structure and to shorten the whole length of a tool. <P>SOLUTION: A cooling fan 27 is provided on the outer periphery of an oil pulse unit 2 and an introduction port 30 and a discharge port 31 of air are formed on a unit case 4. This oil impact tool is provided with the oil pulse unit 2 on a central part of a cylindrical liner 17 filled and sealed with oil, the spindle 6 of which is arranged free to rotate inside of the unit case 4, connects the oil pulse unit 2 to a motor 1 to work, and works by rotating a spindle 6 in the oil pulse unit 2 by pulse accompanied by pressure change of oil repeatedly generated when the oil pulse unit 2 rotates. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, an oil pulse unit in which a spindle is arranged at the center of a cylindrical liner filled and sealed with oil is operatively connected to a motor, and an instantaneous torque is generated by the hydraulic pressure generated when the oil pulse unit rotates to rotate the spindle. The present invention relates to an oil pulse driver that performs screw tightening work.

  Generally, an oil pulse driver has a structure that generates a shock by repeatedly compressing the working oil sealed in the oil pulse unit to drive the driver. There is. Also, the characteristics of the oil are easily affected by temperature changes, and the performance decreases as the oil temperature increases. Therefore, the oil pulse unit needs to be cooled.

In the conventional oil pulse unit cooling structure, the oil pulse unit and the motor are arranged in the front and rear, a cooling fan is provided in front of or behind the electric motor, and the cooling fan is rotated from the air intake port provided in the housing. Cooling was performed by sending cooling air generated by the fan to the oil pulse unit and exhausting it from the exhaust port.
JP 2004-223664 A JP 2005-161505 A

  However, in the structure in which the cooling fan is arranged in front of or behind the motor, the total length of the oil pulse driver has to be long. In addition, since it is necessary to consider the relationship between the cooling air passage from the cooling fan to the oil pulse unit and the components, the structure tends to be complicated. Further, since the distance from the cooling fan to the oil pulse unit becomes long, the cooling efficiency is not high.

  The present invention solves the above problems and provides an oil pulse driver that has a good cooling efficiency, has a simple structure, and can reduce the overall tool length by providing a cooling fan directly on the oil pulse unit. Let that be the issue.

  In order to solve the above problems, the invention according to claim 1 is characterized in that an oil pulse unit in which a spindle is arranged at the center of a cylindrical liner filled and sealed with oil is rotatably provided inside a unit case. In the oil impact tool that works by rotating the spindle in the oil pulse unit by generating momentary torque due to the hydraulic pressure repeatedly generated when the oil pulse unit is rotated, A fan is provided, and the unit case is formed with an air inlet and an outlet.

  According to a second aspect of the present invention, in the first aspect, the cooling fan is provided on an outer periphery of a liner case that covers the liner.

  According to a third aspect of the present invention, in the first aspect, the cooling fan is provided in a liner case that covers the liner.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, at least the cooling fan is made of aluminum.

  Since the invention according to claim 1 has a configuration in which a cooling fan is disposed on the outer periphery of the oil pulse unit, the cooling fan also rotates simultaneously with the rotation of the oil pulse unit, so that external air is introduced directly from the inlet and oil The pulse unit is cooled and discharged from the discharge port. Since the air passage from the introduction port to the discharge port is short, the oil pulse unit always comes into contact with fresh outside air, and the cooling efficiency is very high.

  Further, by arranging the cooling fan on the outer periphery of the oil pulse unit, the motor and the oil pulse unit can be directly connected, and the overall length of the tool can be shortened. The oil pulse unit has a larger diameter than the cooling fan. However, since the motor is originally larger than the oil pulse unit, the oil pulse unit is still smaller even if the cooling fan is arranged on the outer periphery. Thus, the space around the oil pulse unit can be effectively utilized as a cooling space.

  Furthermore, the cooling fan only has to be fitted and fixed to the outer periphery of the oil pulse unit, and the cooling air passage only needs to be formed inside the unit case that houses the oil pulse unit, so the structure is simple, Cost can be kept low.

  Since the invention according to claim 2 is a configuration in which the cooling fan is arranged on the outer periphery of the outermost liner case of the oil pulse unit, it is unnecessary to change the conventional structure.

  According to the third aspect of the present invention, since the cooling fan is provided in the liner case that covers the liner, the cooling structure can be further simplified and more compact, and the cooling efficiency can be further improved.

  According to the invention which concerns on Claim 4, since the cooling fan is formed with aluminum with high heat dissipation efficiency, cooling performance further improves.

  FIG. 1 is a partial longitudinal cross-sectional view of an oil pulse driver which is an example of an oil pulse driver. The oil pulse unit 2 is built in the unit case 4, the grip 5 is provided below the motor housing 3, and the oil pulse unit 2 is rotated together with the motor 1 by operating a trigger (not shown) provided on the grip 5, The spindle 6 disposed at the center of the oil pulse unit 2 is rotated impactively by the oil pulse to drive the driver 7. A rechargeable battery (not shown) is accommodated in the lower part of the grip 5.

  A carrier 10 supporting a plurality of planetary gears (not shown) is rotatably supported in front of the motor 1 to form a planetary gear reduction mechanism, and the planetary gear is directly connected to the output shaft of the motor 1. The rotation of the output shaft is decelerated so that it can be transmitted to the carrier 10. The carrier 10 is connected to the oil pulse unit 2 through a joint 13.

  As shown in FIGS. 2 to 6, the oil pulse unit 2 includes a spindle 6, a liner 17, and a blade 18 in a cylindrical liner case 16 that is closed at both ends by caps 14 and 15. It is filled with oil.

  One end of the spindle 6 is rotatably supported by a rear cap 14, and the other end side is supported by a front cap 15. The front end of the spindle 6 protrudes forward of the liner case 16 and a driver 7 is attached. The joint 13 is fitted to the rear surface of the rear cap 14 so as to rotate integrally.

  The liner 17 is formed in a cylindrical shape and is fixed in the liner case 16. Oil a is sealed in the liner 17. A sliding groove 20 is formed through the rear portion of the spindle 6 in the diametrical direction, and a pair of blades 18 are connected to the sliding groove 20 via a spring 21 so as to expand and contract. As a result, the blade 18 is always urged so as to contact the inner surface of the liner 17. The liner 17 is partitioned. The liner 17 is formed with a seal surface protruding from the inner periphery, and the spindle 6 is formed with a seal surface protruding from the outer periphery. In the state shown in FIG. 2, four oil chambers 22 to 25 are formed which are sealed by the inner peripheral seal surface of the liner 17 and the outer peripheral seal surface of the spindle 6, and the inner peripheral seal surface of the liner 17 and the blade 18. Yes.

  Next, when the screw tightening operation is performed by the oil pulse driver 7, the motor 1 is rotated, and the rotational force decelerated through the planetary gear is transmitted to the oil pulse unit 2 through the joint 13. When 2 rotates, the blade 18 receives the pressure of the oil and rotates. Therefore, when no load is applied to the spindle 6, the spindle 6 rotates only with the resistance of the oil.

  When the load on the spindle 6 is increased, the rotation of the spindle 6 is delayed with respect to the rotation of the oil pulse unit 2, and the four oil chambers 22 to 25 sealed as shown in FIG. 2 are formed. Reaches the position where the oil a is sealed, and the pressure of the oil a suddenly rises to generate a pulse. The liner 17 receives the pulse (impact) of the hydraulic pressure that momentarily rises, and the spindle 6 is driven to tighten the screw with a large force. The screw is tightened strongly by repeating this oil pulse.

  Next, the oil pulse unit 2 is provided with a cooling fan 27. In other words, the cooling fan 27 having a plurality of blades 28 provided radially on the peripheral surface of the cylindrical body 27 a is fixed to the outer periphery of the liner case 16. A space S is formed between the unit case 4 and the cooling fan 27. Correspondingly, an air inlet 30 and a discharge port 31 are formed at the front end of the unit case 4 and the part corresponding to the cooling fan 27, respectively. The discharge port 31 is formed in an elongated shape. The introduction port 30 and the discharge port 31 are continuous with the space S between the unit case and the cooling fan.

  According to the above configuration, since the cooling fan 27 is arranged directly on the outer periphery of the oil pulse unit 2, the cooling fan 27 rotates simultaneously with the rotation of the oil pulse unit 2. For this reason, external air is introduced from the introduction port 30 of the unit case 4, passes through the space S between the unit case and the cooling fan, and is discharged from the discharge port 31. Since the discharge port 31 is elongated and the air passage from the introduction port 30 to the discharge port 31 is short, the oil pulse unit 2 is always in contact with fresh outside air, and the cooling efficiency is very high.

  Moreover, by arranging the cooling fan 27 on the outer periphery of the oil pulse unit 2, the motor 1 and the oil pulse unit 2 can be directly connected, and the overall length of the tool can be shortened. Although the diameter of the unit case 4 is increased by the amount of the cooling fan 27, the motor housing 3 is larger in diameter than the unit case 4 in the first place. It has a small diameter. Thus, the space around the unit case 4 can be effectively utilized as a cooling space.

  Furthermore, the cooling fan 27 only has to be fitted and fixed to the outer periphery of the oil pulse unit 2, and the cooling air passage is also formed inside the unit case 4, so that the structure is simple and the cost is kept low. be able to.

  The cooling fan 27 is not limited to the form provided on the outer periphery of the liner case 16 as described above. For example, as shown in FIGS. 7 to 9, the cooling fan 27 may be provided integrally with the liner case 16 that covers the liner 17. According to this configuration, the cooling structure is further simplified and can be made more compact, and the cooling efficiency is further improved.

  By the way, the cooling fan 27 is preferably made of aluminum having a high heat dissipation effect. As a result, the weight can be reduced, and the cooling effect can be obtained by the cooling by the cooling fan 27 and the heat radiation by the aluminum. Of course, the liner case 16 and the like may be made of aluminum.

The longitudinal cross-sectional view of the principal part of the oil pulse driver which concerns on this invention Sectional view on the XX line of FIG. Side view of the main part of the oil pulse driver Side view of oil pulse unit Longitudinal section of oil pulse unit Sectional view on line YY in FIG. Side view of another form of oil pulse unit Vertical section of the oil pulse unit Sectional drawing on the ZZ line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Oil pulse unit 4 Unit case 6 Spindle 17 Liner 27 Cooling fan 30 Inlet 31 Outlet

Claims (4)

An oil pulse unit with a spindle placed in the center of a cylindrical liner filled and sealed with oil is rotatably installed inside the unit case. The oil pulse unit is operatively connected to the motor, and repeatedly when the oil pulse unit rotates. In the oil impact tool that works by rotating the spindle in the oil pulse unit by generating instantaneous torque by the generated hydraulic pressure,
An oil pulse driver, wherein a cooling fan is provided inside the unit case, and an air inlet and a discharge port are formed in the unit case.   The oil pulse driver according to claim 1, wherein the cooling fan is provided on an outer periphery of a liner case that covers the liner.   The oil pulse driver according to claim 1, wherein the cooling fan is provided in a liner case that covers the liner.   The oil pulse driver according to claim 1, wherein at least the cooling fan is made of aluminum.

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