JP2010284734A - Oil pulse tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil pulse tool effectively cooling an oil pulse mechanism section, and continuously executing screw tightening operation or the like. <P>SOLUTION: The oil pulse tool includes a motor; the oil pulse mechanism section 4 rotatingly driven by the motor, and generating blow force by using oil pressure; and a hammer case 6 for storing the oil pulse mechanism section 4. An inlet port 8 and an outlet port 15 are disposed in the vicinity of the oil pulse mechanism section 4 in the hammer case 6, and a fan 13 operated in a wind passage extending from the inlet port 8 to the outlet port 15 is disposed in the oil pulse tool. The fan 13 is comprised of a centrifugal fan or an axial flow fan manufactured integrally with or separately from the oil pulse mechanism section 4. <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 oil pulse tool having an oil pulse mechanism is conventionally known as a so-called impact tool used when tightening a screw or the like. The oil pulse tool includes an air motor or an electric motor inside the housing. In the case of the air drive type, compressed air for rotating the air motor is supplied from the outside. In the case of the electric type, electric power for driving the electric motor is supplied from the outside through a power cord connected to the housing or from a secondary battery attached to the housing. The rotation shaft of the motor is provided with an oil pulse mechanism through a speed reduction mechanism, and the output shaft of the oil pulse mechanism serves as a spindle for rotating the tip tool.

  The oil pulse mechanism includes a spindle that has a substantially rod shape and is directed forward of the outer frame, a cylindrical body that is provided substantially coaxially with the spindle on the outer side in the radial direction of the spindle, and a blade that partitions a space in the cylindrical body With. The space defined by the spindle and the cylindrical body is filled with oil, and a plurality of oil chambers are defined by the blades. The cylindrical body is drivingly connected to the output shaft of the motor via the speed reduction mechanism, and as the motor rotates at a substantially constant speed, the cylindrical body rotates at a substantially constant speed that is decelerated from the output shaft of the motor. . When the cylindrical body is rotating, the oil in the predetermined oil chamber is compressed, and a pressure difference is generated between the oil chambers. As the spindle rotates to eliminate this pressure difference, a rotation pulse torque is generated in the spindle.

  When a rotation pulse torque is generated on the spindle, heat is generated by sliding a part of the spindle that is in contact with the part and a part of the cylindrical body. Further, when the oil moves from the high pressure oil chamber to the low pressure oil chamber, frictional resistance is generated and heat is generated. If left to stand against this heat generation, the temperature of the oil rises, and output fluctuation can occur due to the change in the viscosity of the oil. In addition, there is a risk of oil leaking from the oil pulse mechanism due to thermal expansion of the oil.

  In the air-type impact tool, since the compressed air for rotating the motor can be used for cooling the oil pulse mechanism, almost no heat problem has occurred. In particular, the compressed air used for the rotation of the air motor is adiabatically expanded and cooled, so the air is used for the rotation of the air motor, and then flows around the oil pulse mechanism and then discharged to the outside. As a result, the oil pulse mechanism was forcibly cooled.

  However, in an oil pulse tool using an electric motor, a cooling method equivalent to that of an air impact tool cannot be employed. Usually, a cooling fan is provided on the rotating shaft of the electric motor in order to cool the electric motor. Patent Document 1 discloses a technique of cooling the oil pulse mechanism using this cooling fan. In Patent Document 1, an air passage is provided between a cooling fan for an electric motor between the outer peripheral side of the speed reduction mechanism and the inner wall of the housing to guide cooling air to the oil pulse mechanism. The air that has flowed around the oil pulse mechanism is discharged to the outside through a discharge port provided in front. Furthermore, in Patent Document 1, a plurality of fin-like projections protruding outward and directed in the axial direction of the cylinder are provided on the outer peripheral surface of the cylinder of the oil pulse mechanism, thereby improving the heat radiation efficiency.

  In order to increase the heat radiation efficiency of the oil pulse mechanism, a technique disclosed in Patent Document 2 is further known. In Patent Document 2, in an oil pulse tool driven by an electric motor provided with an oil pulse mechanism, a heat dissipation protrusion is provided on the outer periphery of the oil pulse mechanism. The heat dissipating protrusions were formed in a spiral shape, and the distance between adjacent protrusions was set larger than the clearance between the inner wall of the case housing the oil pulse mechanism and the heat dissipating protrusion outer periphery. Furthermore, the wind window was provided in the case according to the position of the both ends of the heat radiation protrusion. With this configuration, an air flow can be formed inside the case, and the heat of the oil pulse mechanism can be effectively released from the heat dissipation protrusion.

JP 2003-291074 A JP 2004-249423 A

  In Patent Document 1, the wind guided to the oil pulse mechanism is not cold air such as compressed air but heated air after cooling the electric motor. For this reason, there is a possibility that a situation insufficient to forcibly cool the oil pulse mechanism unit only with the wind from the cooling fan for the electric motor may occur. Also, structurally, it is necessary to form a passage for bypassing the speed reduction mechanism, that is, a dedicated passage protruding to the outer peripheral side, which hinders downsizing of the oil pulse tool.

  In the technique of Patent Document 2, the cooling air flow path is provided separately from the motor, and outside air is taken in from the outside. Therefore, there is no problem that the taken-in air is already heated. However, since the heat dissipation protrusion provided on the outer periphery of the oil pulse mechanism is spiral and the air passage from the wind window on the inlet side to the outlet side is long, the flow rate cannot be secured sufficiently and the cooling effect may be insufficient. It was. Furthermore, since the rotation speed of the electric motor is reduced by the reduction mechanism, there is a problem that the cooling effect is further reduced. Another factor is that the manufacturing process of the oil pulse mechanism is complicated and the manufacturing cost increases.

  The present invention has been made in view of the above background, and an object of the present invention is to provide an oil pulse tool capable of effectively cooling an oil pulse mechanism and continuously performing a screw tightening operation or the like.

  Another object of the present invention is to provide an oil pulse tool that realizes a cooling mechanism for an oil pulse mechanism that can be easily manufactured without increasing the length of the main body.

  Still another object of the present invention is to provide an oil pulse tool that can prevent dust and the like from being sucked from a cooling inlet.

  Of the inventions disclosed in the present application, typical features will be described as follows.

  According to one aspect of the present invention, there is provided an oil pulse tool having a motor, an oil pulse mechanism that is driven by the motor and generates a striking force using hydraulic pressure, and a housing that houses the oil pulse mechanism. In addition, an intake port and an exhaust port are provided in the vicinity of the oil pulse mechanism portion of the housing portion, and a fan is provided in the oil pulse mechanism portion in the air path from the intake port to the exhaust port. The housing part is mainly composed of two parts: a housing body that houses a motor and a handle part, and a metal hammer case that is attached to the housing body and houses an oil pulse mechanism part. Formed in a hammer case.

  According to another feature of the present invention, the intake port is formed in the hammer case at a position facing the vicinity of the outer periphery of the front portion of the oil pulse mechanism portion, and the exhaust port is positioned near the outer periphery of the rear portion of the oil pulse mechanism portion. A centrifugal fan was provided at a position facing the inner periphery of the exhaust port as a fan. At this time, a recess having a radially increased inner diameter was formed at a location facing the centrifugal fan of the hammer case in the radial direction, thereby reducing the amount of radial protrusion by the centrifugal fan.

  The position where the fan is attached is not limited to this, and the fan may be provided only in a region facing the intake port in the radial direction or only in a region facing the exhaust port in the radial direction. Alternatively, in the axial direction of the oil pulse mechanism unit and in the region between the intake port and the exhaust port (excluding the region overlapping with the intake port and the exhaust port), an axial fan is provided on the outer peripheral side of the oil pulse mechanism unit. You may comprise so that it may provide.

  According to still another feature of the present invention, a filter is provided at the intake port. The filter may be configured to be simply attached to the intake port, or may be configured such that a protector is provided on the outer periphery of the hammer case and interposed between the hammer case and the protector. For example, a mesh-like filter can be provided.

  According to the first aspect of the present invention, the intake and exhaust ports are provided in the vicinity of the oil pulse mechanism portion of the housing portion, and the fan is provided in the oil pulse mechanism portion in the air passage from the intake port to the exhaust port. The oil pulse mechanism can be effectively cooled by a dedicated fan. Moreover, since the rotational force of the oil pulse mechanism is used as a power source for rotating the fan, it is not necessary to prepare a power source for the fan separately.

  According to the invention of claim 2, the housing part includes the housing body and a metal hammer case, and the intake port and the exhaust port are formed in the hammer case, so that the structure on the housing body side is not changed at all. The present invention can be realized by changing the hammer case.

  According to the invention of claim 3, the intake port is provided in the vicinity of the outer periphery of the front portion of the oil pulse mechanism portion, the exhaust port is provided in the vicinity of the outer periphery of the rear portion of the oil pulse mechanism portion, and serves as a fan. Since the centrifugal fan is provided at the circumferentially opposed position, the cooling fan can be efficiently formed by the centrifugal fan, and the oil pulse mechanism can be efficiently cooled.

  According to the fourth aspect of the present invention, since the concave portion having a larger inner diameter in the radial direction is formed at a location facing the centrifugal fan of the hammer case in the radial direction, the diameter of the hammer case can be increased by providing the centrifugal fan. Can be suppressed.

  According to the fifth aspect of the present invention, the fan is provided only in the region facing the air intake port in the radial direction or only in the region facing the exhaust port in the radial direction. Fans can be provided at various positions.

  According to the invention of claim 6, since the axial fan is provided on the outer periphery of the oil pulse mechanism near the intake port, the cooling performance can be further improved.

  According to the seventh aspect of the present invention, since the filter is provided at the intake port, it is possible to prevent chips and the like generated during work from being sucked from the intake port.

  According to the invention of claim 8, since the protector is provided on the outer periphery of the hammer case and the filter is provided at the intake port so as to be interposed between the hammer case and the protector, the filter can be easily fixed using the protector. Can do.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a longitudinal section showing the whole oil pulse tool concerning the example of the present invention. It is sectional drawing which shows the structure of the oil pulse mechanism part 4 vicinity of FIG. 1, and the oil pulse mechanism part 4 shows the side view. It is sectional drawing which shows the structure of the oil pulse mechanism part 24 vicinity which shows the 2nd Example of this invention. It is sectional drawing which shows the structure of the oil pulse mechanism part 24 vicinity which shows the modification of the 2nd Example of this invention. It is a side view which shows the attachment structure of the oil pulse mechanism part 34 and the fan 33 which show the 3rd Example of this invention. It is a rear view of the fan 33 of FIG. It is a longitudinal cross-sectional view which shows the whole oil pulse tool 51 which shows the 4th Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals, and repeated description is omitted. Further, in this specification, description will be made assuming that the front-rear and up-down directions are the directions shown in FIG.

  FIG. 1 is a longitudinal sectional view showing an entire oil pulse tool according to an embodiment of the present invention. The oil pulse tool 1 uses electric power supplied from a rechargeable battery 16, drives a motor 5 as a drive source, drives an oil pulse mechanism unit 4 via a planetary gear mechanism 3 serving as a speed reduction mechanism, and provides an oil pulse mechanism unit. By applying rotational force and striking force to the spindle 9 connected to 4, the rotational striking force is transmitted continuously or intermittently to a tip tool (not shown) such as a driver bit or socket bit to perform screw tightening or bolt tightening. I do.

  The motor 5 is a DC motor, for example, and is supported by two bearings 19a and 19b so that the rotating shaft 5a can rotate. The housing body 2 is manufactured by molding plastic or the like, but can be divided on a vertical plane passing through the rotation shaft 5a of the motor 5, that is, can be divided into two in the left-right direction, and is fixed by a plurality of screws. Therefore, the housing body 2 is formed with a plurality of screw holes 18 and corresponding screw bosses (not shown).

  The housing part includes a housing body part 2 formed by integral molding of a synthetic resin such as plastic, and a hammer case 6 manufactured by metal integral molding. Inside the housing portion, a motor 5, a planetary gear mechanism portion 3, and an oil pulse mechanism portion 4 are accommodated from the rear. A handle portion 2a extending downward from below the motor 8 is formed in the housing body portion 2, and a trigger switch 14 is disposed in the vicinity of the attachment portion of the handle portion 2a. A switch circuit board 28 is provided inside the handle portion 2 a, and electric power proportional to the amount of pulling the trigger switch 14 is supplied to the motor 5.

  The oil pulse mechanism unit 4 disposed on the front side of the planetary gear mechanism unit 3 includes a liner 10, which is a cylindrical body coupled to an input shaft, coupled to the output shaft of the planetary gear mechanism unit 3, and the motor 3 rotates. Transmitted in a decelerated state. The planetary gear mechanism 3 is rotatably supported by two bearings 29a and 29b at the front and rear thereof. Since the bearing 29a on the front side also functions to hold the rear side of the oil pulse mechanism unit 4, a large bearing may be used. The oil pulse mechanism unit 4 supports a spindle 9 with a cylindrical liner 10 filled with hydraulic oil, and is provided with a blade 11 that divides the inside of the case into a plurality of oil chambers in the circumferential direction. By the relative rotation of the liner 10 and the spindle 9, the working oil is sealed by the blade 11 and the inner surface of the case, the oil chamber is raised to a predetermined pressure, and the impact torque is instantaneously transmitted to the spindle 9.

  When the trigger switch 14 is pulled by the operator and the motor 5 is started, the power of the motor 5 is transmitted to the planetary gear mechanism 3 through the pinion 17 connected to the tip, and drives the liner 10 of the oil pulse mechanism unit 4. . The oil pulse mechanism unit 4 fills and seals oil in a cavity formed in the liner 10, and provides two blade insertion grooves in the spindle 9 that is coaxially fitted in the liner 10. Then, the blade 11 is inserted into the blade insertion groove, and the blade 11 is urged toward the outer periphery of the spindle 9 so as to contact the liner 10. By rotating the liner 10, pressure is generated in the oil pulse mechanism 4 when the seal portion formed on the inner peripheral surface of the liner 10 matches the seal portion formed on the outer peripheral surface of the spindle 9, and the spindle 9 It is generated as impact torque and is tightened through a tip tool (not shown).

  When the oil pulse mechanism unit 4 is hit, heat is generated inside the oil pulse mechanism unit 4 due to friction when the oil is pushed out from the high pressure chamber to the low pressure chamber and sliding friction between the blade 11 and the liner 10. In order to dissipate this heat from the oil pulse mechanism 4, an intake port (air intake) 8 and an exhaust port 15 are formed in the hammer case 6 and the protector 7 outside the oil pulse mechanism 4 as shown in FIG. . In the region from the intake port 8 to the exhaust port 15, the size of the inner wall of the hammer case 4 is configured to be relatively large with respect to the oil pulse mechanism unit 4. And in the part in which the exhaust port 15 was formed, the radial fan 13 was provided in the outer periphery of the oil pulse mechanism part 4 (outer periphery of the liner 10). With this configuration, when the liner 10 rotates, the radial fan 13 rotates, sucks air from the intake port 8, and the air flows along the outer periphery of the oil pulse mechanism unit 4, thereby generating an oil pulse mechanism unit that generates heat. 4 can be cooled. The air that flows along the outer periphery of the oil pulse mechanism 4 is discharged from the exhaust port 15 to the outside by the radial fan 13.

  Next, the flow of air flowing around the oil pulse mechanism unit 4 will be described with reference to FIG. The radial fan 13 provided on the outer periphery of the oil pulse mechanism unit 4 is a centrifugal fan that discharges air outward in the circumferential direction when the oil pulse mechanism unit 4 rotates. The intake port 8 is formed in the hammer case 6, and the position thereof is a position facing the outer peripheral side of the front part of the oil pulse mechanism unit 4. Further, the exhaust port 15 is formed in the hammer case 6, and its position is a position facing the outer peripheral side of the rear portion of the oil pulse mechanism unit 4. The shape of the hammer case 6 outside the oil pulse mechanism 4 is formed so that air can flow from the intake port 8 side to the exhaust port 15 side. In addition, the front part, the rear part, and the center part are parts divided at equal intervals in the front-rear direction (axial direction) of the large diameter part of the liner 10 of the oil pulse mechanism part 4. The position of the intake port 8 may be a position corresponding to the front portion, and is not necessarily the front end portion. Moreover, the position of the exhaust port 15 should just be a position corresponding to a front part. It does not necessarily have to be the rear end. However, it is preferable that the distance from the intake port 8 to the exhaust port 15 is sufficiently long.

  In the present embodiment, the number of intake ports 8 is provided at two locations above and below the hammer case 6. However, the number of intake ports 8 is not limited to two, and may be one, or may be provided at two or more locations. Also good. Similarly, although the exhaust port 15 is provided at one place on the upper side of the hammer case 6 in the present embodiment, it is not limited to one place but may be two or more places.

  A protector 7 is covered on the outer peripheral side of the hammer case 6. The protector 7 is made of an elastic synthetic resin, and similar openings are formed at positions corresponding to the intake port 8 and the exhaust port 15 of the hammer case 6.

  A mounting hole 9 a is formed at the tip of the spindle 9. A tip tool (not shown) is mounted in the mounting hole 9a. A hole for inserting a ball 21 is formed in a part of the spindle 9, and a sleeve 12 is provided on the outer peripheral side of the tip portion of the spindle 9. The sleeve 12 is urged rearward by a spring 22, and by restricting or releasing the movement of the ball 21 toward the outer peripheral side, the tip tool (not shown) can be attached to and detached from the mounting hole 9 a.

  According to the present embodiment, the shape of the hammer case 6 and the protector 7 outside the oil pulse mechanism 4 is enlarged from the intake port 8 side to the exhaust port 15 side, and the outer peripheral portion of the oil pulse mechanism unit 4 on the exhaust port 15 side is increased. By providing the radial fan 13, a cooling structure of the oil pulse mechanism unit 4 can be realized. In realizing this cooling mechanism, it is not necessary to extend not only the length of the oil pulse mechanism 4 but also the length L (see FIG. 1) of the impact tool 1. Although the diameter of the hammer case 6 that covers the oil pulse mechanism 4 is slightly larger, it is still smaller than the diameter of the portion of the housing body 2 that houses the motor 5, so that the diameter of the hammer case 6 is slightly increased. It does not cause problems such as deterioration of workability of impact tools.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the oil pulse mechanism 24 shown in FIG. 3, in addition to the radial fan 23, an axial fan (axial fan) 25 is added at a position in front of the oil pulse mechanism 24 and in the vicinity of the suction port 8. Provided. By providing the axial fan 25, the air flow rate from the suction port 8 increases. In addition, since the sucked air flows in a spiral manner on the outer periphery of the oil pulse mechanism 24 as indicated by an arrow 26, the cooling effect on the oil pulse mechanism 24 can be further enhanced. The radial fan 13 and the axial fan 23 may be directly processed into the liner 10 of the oil pulse mechanism 24 and manufactured as an integral structure, or as a separate metal part, the outer periphery of the oil pulse mechanism 4 (the liner 10 It may be manufactured by press-fitting into the outer periphery.

  In the second embodiment, by providing the axial fan 25 on the outer periphery of the oil pulse mechanism 24 on the intake port 8 side, the amount of air sucked can be increased, and the flow of air around the oil pulse mechanism 24 is reduced. It can be spiraled to improve the cooling performance of the oil pulse mechanism, enabling continuous operation for a longer time.

  Next, the structure in the vicinity of the oil pulse mechanism 24 showing a modification of the second embodiment will be described with reference to FIG. In the embodiment described above, the intake 8 is provided in the hammer case 6 and the protector 7 and the outside air is taken in. Therefore, if the intake 8 is left open, chips and the like generated during work are sucked in, There is a risk of causing a rotation failure of the oil pulse mechanism 24. Therefore, in this modification, a mesh-like filter 32 is provided between the hammer case 6 and the protector 7 at the intake port 8. The filter 32 is sufficiently large compared to the opening area of the intake port 8 and is disposed so as to completely cover the opening. The filter 32 is affixed to the hammer case 6 and is configured to cover an area other than the intake port 8 by the protector 7. By using a sufficiently thin mesh filter member as the filter 32, suction of chips and the like can be prevented while minimizing the increase in the diameter of the filter 32 portion. Instead of the filter 32, the intake port 8 may be formed in a long and narrow slit shape.

  Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a side view showing the mounting structure of the oil pulse mechanism 34 and the centrifugal fan unit 33 according to the third embodiment of the present invention. In FIG. 5, the oil pulse mechanism 34 is basically the same as that conventionally used, and nothing is processed on the outer peripheral side. The fitting shaft portion 34a protruding rearward of the fan unit 33 has a hexagonal cross section on the rear side, and a circular cross section on the front side. The fitting shaft portion 34a is constituted by an integral member, and the hexagonal portion is formed by machining. The centrifugal fan unit 33 is attached to the oil pulse mechanism 34 from the rear side.

  The centrifugal fan unit 33 is manufactured by integral molding using, for example, a polymer resin such as plastic. The centrifugal fan unit 33 has a cylindrical portion 33a that is substantially closed at the rear. It is formed. An opening 33e is formed on the rear side of the fan unit 33 so as not to contact the outer peripheral portion of the fitting shaft portion 34a. Four protrusions 33 d are formed inside the fan unit 33. The protrusion 33d is inserted into a hole 34c provided in the rear surface 34b of the oil pulse mechanism 34. The protrusions 33d and the holes 34c serve as a rotation prevention mechanism for preventing the centrifugal fan unit 33 and the oil pulse mechanism 34 from rotating relatively. The rear end (opening 33e) of the fan unit 33 is positioned so as to contact the inner ring of the bearing 29a. For this reason, since the fan unit 33 cannot move rearward, the centrifugal fan unit 33 only needs to be fitted into the rear end portion of the oil pulse mechanism 34, and the centrifugal fan unit 33 is firmly attached to the oil pulse mechanism 34 with an adhesive or the like. It is not necessary to fix to (it does not matter if it adheres and fixes). Most of the rear surface 34b of the oil pulse mechanism 34 is covered by the centrifugal fan unit 33, and is mounted on the planetary gear mechanism 3 with the centrifugal fan unit 33 mounted.

  FIG. 6 is a rear view of the centrifugal fan unit 33 as viewed from the rear. In the vicinity of the rotation center of the centrifugal fan unit 33, a large opening 33e is formed at the center for allowing the fitting shaft 34a (see FIG. 5) of the oil pulse mechanism 34 to protrude. Since the centrifugal fan unit 33 is for the purpose of generating an air flow, its thickness may be thin. Therefore, the significant increase in the oil pulse mechanism 34 due to the provision of the centrifugal fan unit 33 is slight, which affects the operability. Not enough.

  According to the third embodiment, the fan configuration of the oil pulse mechanism unit 4 can be achieved by simply mounting the centrifugal fan unit 33 on the oil pulse mechanism unit 34 without any change to the oil pulse mechanism unit 34 used conventionally. Since this can be realized, the present invention can be realized at a low cost. Moreover, since the centrifugal fan unit 33 can be manufactured from a synthetic resin such as plastic, a fan having a complicated shape can be realized.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. In the cooling structure described above, since the cooling fan is provided between the outer peripheral side of the oil pulse mechanism and the inner peripheral side of the hammer case, the diameter of the hammer case is slightly thick. Depending on the usage environment of the oil pulse tool, the fineness of the hammer case may be more important than the increase in the longitudinal length of the tool. Therefore, in the fourth embodiment, the air inlet 48 is formed at the front ends of the hammer case 46 and the protector 47, and the cooling fan 40 is provided between the motor 5 and the oil pulse mechanism 44.

  The cooling fan 40 is rotated so that air is sucked in from the air inlet 48 in front of the hammer case 46 and the protector 47, and this air flows along the outline of the oil pulse mechanism 44. The air that has flowed to the rear end of the oil pulse mechanism unit 4 flows into the cooling fan 40, flows radially outward by the cooling fan 40, and is discharged outside through the discharge port 45. The cooling fan 40 is provided separately from the cooling fan 39 for the motor 5, and is manufactured by integral molding of plastic or the like, for example, and is mounted coaxially with the fitting shaft portion of the oil pulse mechanism portion 44. In the fourth embodiment, compared to the oil pulse tools according to the first and second embodiments, the total length (L1 + L2) of the oil pulse tool is increased by the total length L2 of the cooling fan 40. Instead, the hammer case 46 is used. The diameter of the hammer case 46 is drawn larger so that the presence of the air flow path can be easily understood in FIG.

  According to the fourth embodiment, the configuration of the present invention can be realized simply by adding the cooling fan 40 and improving the hammer case 46 and the protector 47 compared to the conventional oil pulse tool, so that the increase in cost is reduced. The oil pulse mechanism 4 can be cooled while being pressed down, and continuous work is possible.

  As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the intake and exhaust ports are provided in the housings at both ends of the oil pulse mechanism unit, and the exhaust fan is provided on the outer periphery of the oil pulse mechanism unit on the exhaust port side. You may comprise so that the fan for intake may be provided in the outer periphery of a part.

  In the above-described embodiment, the oil pulse mechanism is connected to the rotation shaft of the motor via the reduction gear (planet gear mechanism). However, the oil pulse mechanism is configured to connect the oil pulse mechanism directly to the rotation shaft of the motor. The same applies to pulse tools. Furthermore, the type of motor is not limited to a DC motor with a brush, and a brushless DC motor, an AC motor, an air motor, or any drive source can be similarly applied.

DESCRIPTION OF SYMBOLS 1 Oil pulse tool 2 Housing main-body part 2a Handle part 3 Planetary gear mechanism part 4 Oil pulse mechanism part 5 Motor 5a (motor) rotating shaft 6 Hammer case 7 Protector 8 Inlet 9 Spindle 10 Liner 11 Blade 12 Sleeve 13 Radial fan 14 Trigger switch 15 Exhaust port 16 Battery 17 Pinion 18 Screw boss 19a, 19b Bearing 20 Inner cover 21 Ball 22 Spring 23 Radial fan 24 Oil pulse mechanism 25 Axial fan 32 Mesh filter 33 Centrifugal fan unit 33a Cylindrical part 33b Fin 33c Rear face 33d Projection 33e Opening 34 Oil pulse mechanism 34a (Oil pulse mechanism) fitting shaft 34b (Oil pulse mechanism) rear
34c Hole 39 (for oil pulse mechanism) Cooling fan (for motor)
40 Cooling fan 44 (for oil pulse mechanism) 45 Oil pulse mechanism 45 Exhaust port 46 Hammer case 47 Protector 48 Inlet port 50 Liner 51 Oil pulse tool

Claims (8)

A motor, and an oil pulse mechanism that is driven by the motor and generates a striking force using hydraulic pressure;
An oil pulse tool having a housing part that accommodates the oil pulse mechanism part,
An intake port and an exhaust port are provided in the vicinity of the oil pulse mechanism portion of the housing portion,
An oil pulse tool, wherein a fan is provided in the oil pulse mechanism section in an air passage from the intake port to the exhaust port. The housing part includes a housing body that houses the motor and has a handle part, and a metal hammer case that is attached to the housing body and houses the oil pulse mechanism part,
The oil pulse tool according to claim 1, wherein the intake port and the exhaust port are formed in the hammer case. The inlet is formed in the hammer case at a position facing the vicinity of the outer periphery of the front portion of the oil pulse mechanism,
The exhaust port is formed in the hammer case at a position facing the vicinity of the outer periphery of the rear part of the oil pulse mechanism,
The oil pulse tool according to claim 2, wherein a centrifugal fan is provided as the fan at a position facing the inner peripheral side of the exhaust port.   The oil pulse tool according to claim 3, wherein a concave portion having a radially increased inner diameter is formed at a location of the hammer case facing the centrifugal fan in a radial direction.   3. The oil pulse mechanism section according to claim 1, wherein the fan is provided only in a region facing the intake port in a radial direction or only in a region facing the exhaust port in a radial direction. The oil pulse tool described.   The axial flow fan is provided on the outer peripheral side of the oil pulse mechanism unit in an axial direction of the oil pulse mechanism unit and in a region between the intake port and the exhaust port. The oil pulse tool described.   The oil pulse tool according to any one of claims 1 to 6, wherein a filter is provided at the intake port. A protector is provided on the outer periphery of the hammer case,
The oil pulse tool according to any one of claims 2 to 4, wherein a filter is provided at the intake port so as to be interposed between the hammer case and the protector.

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