JP2021007996A - Power tool - Google Patents

Abstract

To provide a power tool capable of improving workability by damping vibration while suppressing an increase in the size of a holding section.SOLUTION: A power tool 1 includes: a motor 3; a power transmission section 5 which transmits driving force of the motor 3 to an output shaft 61; a motor housing 22 which houses the motor 3; a gear housing 21 which is connected to one end of the motor housing 22 and houses the power transmission section 5; a rear housing 23 which is connected to the other end of the motor housing 22; a cylindrical section 7 which is the cylindrical section 7 of an integral body provided to surround an outer peripheral surface of the motor housing 22 and is regulated in the movement in a direction for connecting the one end and the other end by the rear housing 23; and an elastic body 8 which is provided on an outer peripheral surface of the motor housing 22 and is configured to damp vibration generated by the driving force of the motor 3 which is transmitted from the motor 3 to the cylindrical section 7.SELECTED DRAWING: Figure 5

Description

The present invention relates to a power tool.

Conventionally, a power tool that drives a tip tool by a driving force of a motor to perform polishing, cutting, cutting, etc. has been widely used.

In Patent Document 1, as an example of such a power tool, a motor having an output shaft, a bearing that rotatably supports the output shaft, a housing for accommodating the motor, and a bearing and a housing are provided. A grinder having an elastic body and a bearing is disclosed. In the grinding machine of Patent Document 1, the housing is a portion gripped by an operator. The elastic body is configured to suppress the vibration generated by the rotation of the motor from being transmitted to the housing.

International Publication No. 2014/132745

However, if the bearing of the output shaft of the motor is supported by an elastic body, the shaft shake of the output shaft is likely to occur, which may cause an increase in vibration and deterioration of the output shaft. In addition, the motor housing may be an integral part of the power tool that cannot be divided, which enables strong support of the motor and eliminates the need to provide screws or screw bosses that are different from the split type. However, the technique of Patent Document 1 cannot be applied to a power tool having an indivisible motor housing because the elastic body is sandwiched between two divided housings.

Therefore, an object of the present invention is to provide a power tool capable of dampening vibration transmitted to an operator while suppressing an increase in the size of the grip portion.

In order to solve the above problems, the present invention relates to a motor, a power transmission unit that transmits the driving force of the motor to an output shaft, a motor housing that houses the motor, and the power that is connected to one end of the motor housing. A grip portion of an integral body provided so as to surround a gear housing accommodating a transmission portion, a rear housing connected to the other end of the motor housing, and an outer peripheral surface of the motor housing, and the one end portion. A grip portion whose movement in the direction connecting the other end is restricted by the rear housing and a driving force of the motor provided on the outer peripheral surface of the motor housing and transmitted from the motor to the grip portion. Provided is a power tool characterized by having an elastic body configured to dampen the generated vibrations.

According to such a configuration, it is possible to attenuate the vibration transmitted from the motor while suppressing the increase in size of the grip portion as compared with the case where the grip portion is fixed by using a connecting member such as a screw. ..

Further, the rear housing has a half-split first rear housing and a second rear housing, and the motor housing is provided so that the half-split first rear housing and the second rear housing have a tubular shape. It is preferably fixed to the other end.

According to such a configuration, it is possible to sandwich and fix a component such as a controller box between the first rear housing and the second rear housing.

Further, the rear housing is provided so as to surround the other end of the motor housing, and the elastic body is provided between the inner peripheral surface of the rear housing and the outer peripheral surface of the motor housing. Is preferable.

With such a configuration, it is possible to attenuate the vibration transmitted to the rear housing.

Further, a protrusion is projected from the outer peripheral surface of the motor housing, and a recess that can be engaged with the protrusion is formed on the inner peripheral surface of the grip portion, and the engagement between the protrusion and the recess forms the recess. It is preferable that the rotation of the grip portion with respect to the motor housing is restricted.

According to such a configuration, when the operator grips the outer peripheral surface of the grip portion and works, the movement of the grip portion with respect to the motor housing can be more reliably regulated, so that the operability is improved. Can be done.

Further, it is preferable that a plurality of the elastic bodies are provided side by side in the circumferential direction of the motor housing, and the protrusions are located between adjacent elastic bodies.

According to such a configuration, it is possible to more reliably attenuate the vibration as compared with the case where one elastic body is provided.

Further, a plurality of the elastic bodies are provided side by side in the direction connecting the one end portion and the other end portion of the motor housing, and the regulation protrusions protrude from the inner peripheral surface of the grip portion, and the regulation protrusions are the one end portion. The rear housing is interposed between the adjacent elastic bodies arranged in the direction connecting the other end portion, and the rear housing moves in the direction connecting the one end portion and the other end portion of the grip portion via the elastic body. It is preferable to regulate.

According to such a configuration, it is possible to attenuate the vibration transmitted from the motor while suppressing the increase in size of the grip portion as compared with the case where the grip portion is fixed by using the connecting member.

Further, the rear housing is configured so that a battery can be attached, and the rear housing accommodates a terminal portion that can be electrically connected to the battery, and the terminal portion is a half-split first rear housing. It is preferably sandwiched by the second rear housing.

According to the power tool of the present invention, it is possible to improve workability by attenuating vibration while suppressing an increase in size of the grip portion.

It is sectional drawing which shows the internal structure of the vibrating tool which concerns on 1st Embodiment of this invention. It is a perspective view which shows the appearance of the vibrating tool which concerns on 1st Embodiment of this invention. It is an exploded perspective view of the vibration tool which concerns on 1st Embodiment of this invention. It is a DD cross-sectional view of FIG. 1 which shows the internal structure of the vibrating tool which concerns on 1st Embodiment of this invention. FIG. 5 is a sectional view taken along line EE of FIG. 4 showing an internal structure of a vibrating tool according to the first embodiment of the present invention. It is sectional drawing which shows the internal structure of the vibrating tool which concerns on the modification of 1st Embodiment of this invention. It is sectional drawing which shows the internal structure of the vibrating tool which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the arrangement relation of each housing of the vibration tool which concerns on 2nd Embodiment of this invention.

The vibration tool 1 which is an example of the power tool according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

The vibrating tool 1 is a power tool that grinds, cuts, cuts, etc., the work material by driving (vibrating) the tip tool P, and includes a housing 2, a motor 3, a control unit 4, a power transmission unit 5, and the like. It includes an output shaft portion 6 having an output shaft 61, a cylindrical portion 7, a first elastic body 8, and a second elastic body 9.

In the following description, "up" shown in FIG. 1 is defined as upward, "down" is defined as downward, "front" is defined as forward, and "rear" is defined as backward. Further, in FIG. 1, the direction from the back of the paper to the front of the paper is defined as the left direction, and the direction from the front of the paper to the back of the paper is defined as the right direction.

As shown in FIGS. 1 and 2, the housing 2 forms the outer shell of the vibrating tool 1 and has a substantially cylindrical shape extending in the front-rear direction. The housing 2 has a front housing 21, a motor housing 22, and a rear housing 23 in this order from the front. Details of the front housing 21, the motor housing 22, the rear housing 23, the cylindrical portion 7, the first elastic body 8, and the second elastic body 9 will be described later.

A battery mounting portion 237 is provided at the rear end of the rear housing 23. The battery mounting portion 237 is configured so that the battery pack Q can be mounted. The battery pack Q has a plurality of battery cells such as a secondary battery cell inside, and outputs electric power corresponding to the vibration tool 1.

A slide switch 231 is provided on the upper portion of the rear housing 23 at a position in front of the battery mounting portion 237. In other words, the slide switch 231 is provided on the outer wall of the housing 2, and the operator can operate the slide switch 231 from the outside. The slide switch 231 is configured to be movable in the front-rear direction by being operated from the outside.

Inside the rear housing 23, the control unit 4 is housed at substantially the same position as the slide switch 231 in the front-rear direction. The control unit 4 has a controller box 41 and a main switch 42.

The controller box 41 has a substantially rectangular parallelepiped shape, and is provided at the same position as the slide switch 231 in the front-rear direction so that its longitudinal direction is parallel to the front-rear direction. The controller box 41 houses a substrate on which a control circuit (not shown) for controlling the motor 3 is mounted.

The main switch 42 is electrically connected to the controller box 41 via a signal cable (not shown). The main switch 42 outputs a tool start signal for starting the motor 3 to the controller box 41 when the slide switch 231 is slid in a predetermined direction (starting operation) (for example, when the slide switch 231 is slid backward). It is configured in. Further, the main switch 42 stops the output of the tool start signal when the slide switch 231 is slid (released) in the direction opposite to the sliding operation direction of the starting operation (for example, when the slide switch 231 is slid forward). It is configured to do.

Inside the motor housing 22, the motor 3 is housed at a position in front of the controller box 41. The motor 3 is a brushless motor and has a rotating shaft 31, a rotor 32, and a stator 33. The motor housing 22 is formed as an indivisible integral body. The motor 3 is accommodated by being inserted rearward from the front opening of the motor housing 22.

The rotation shaft 31 is rotatable about an axis A extending in the front-rear direction. The axis A is a line extending back and forth through the axis of the rotating shaft 31. The rotating shaft 31 is rotatably supported by a bearing 31A supported by the motor housing 22.

A power transmission unit 5 is housed inside the front housing 21. The power transmission unit 5 is connected to the rotating shaft 31 of the motor 3. The power transmission unit 5 has a spindle 51, a bearing 52, and a swing arm 53.

The spindle 51 extends in the front-rear direction and is rotatably supported by the front housing 21 via a ball bearing 50. The front end portion of the rotating shaft 31 is fitted to the rear portion of the spindle 51. As a result, the spindle 51 can rotate about the axis A integrally with the rotating shaft 31. Further, the spindle 51 has an eccentric shaft 51A.

The eccentric shaft 51A forms the front end portion of the spindle 51 and has a substantially cylindrical shape extending in the front-rear direction. The eccentric shaft 51A is configured to have a diameter smaller than the diameter of other parts of the spindle 51, and the axis B passing through the axis of the eccentric shaft 51A is slightly deviated from the axis A. As a result, when the spindle 51 rotates about the axis A, the axis B revolves around the axis A.

A bearing 52 is provided on the eccentric shaft 51A. The bearing 52 has an inner ring and an outer ring, and the inner ring is fixed to the eccentric shaft 51A.

The swing arm 53 has a body portion 53A and an arm portion 53B. The body portion 53A extends in the front-rear direction, the body portion 53A is located in front of the arm portion 53B, and the rear portion of the body portion 53A is connected to the arm portion 53B. The front portion of the body portion 53A has a substantially cylindrical shape, and a hole portion extending in the vertical direction is formed. The output shaft 61 is fixed to the hole of the body portion 53A. The arm portion 53B has two arm portions extending rearwardly, and has a substantially U-shape having an opening rearward in a top view (not shown). The two arm portions of the arm portion 53B are in contact with the outer ring of the bearing 52. In other words, the outer ring of the bearing 52 is sandwiched from the left-right direction by the two arm portions of the arm portion 53B.

The output shaft portion 6 is supported in the front housing 21 and has an output shaft 61 and a hexagon socket head screw 62.

The lower portion of the output shaft 61 has a substantially cylindrical shape extending in the vertical direction, and a female screw hole 61a extending in the vertical direction is formed in the lower portion of the output shaft 61. The output shaft 61 is rotatable about an axis C extending in the vertical direction. The body portion 53A of the swing arm 53 described above is fixed to the output shaft 61 so as to be swingable around the axis C.

When the spindle 51 rotates about the axis A, the eccentric shaft 51A rotates about the axis A. As a result, the distance from the axis A to the outer surface of the eccentric shaft 51A in the left-right direction changes, and accordingly, the arm portion 53B sandwiching the outer ring of the bearing 52 to which the eccentric shaft 51A is fixed from the left and right has the axis C. It is configured to swing around the center. Further, as the arm portion 53B swings, the body portion 53A fixed to the output shaft 61 also swings around the axis C.

The hexagon socket head screw 62 is a male screw and is configured to be screwable into the female screw hole 61a. By sandwiching the plate-shaped tip tool P between the head of the hexagon socket head screw 62 and the lower portion of the output shaft 61, the tip tool P can be held by the output shaft portion 6.

A lever 21A is provided on the upper portion of the front housing 21 at the same position as the output shaft 61 in the front-rear direction. The lever 21A is configured to be rotatable (swing) about a rotation shaft extending in the left-right direction. When the operator rotates the lever 21A counterclockwise on the paper surface, the holding of the tip tool P by the hexagon socket head screw 62 and the output shaft 61 is released, and the tip tool P is configured to come off. Further, when the operator rotates the lever 21A clockwise on the paper surface, the tip tool P is held between the hexagon socket head screw 62 and the output shaft 61.

Next, the details of the front housing 21, the motor housing 22, the rear housing 23, the cylindrical portion 7, the first elastic body 8, and the second elastic body 9 will be described with reference to FIGS. 3 to 5.

As shown in FIG. 3, the front housing 21 has a cylindrical shape extending in the front-rear direction and forms the front portion of the housing 2. The front portion of the motor housing 22 is connected to the rear portion of the front housing 21 by a screw S (FIG. 5) extending in the front-rear direction. The front housing 21 supports the lever 21A at its upper portion, and as described above, houses the power transmission portion 5 and the upper portion of the output shaft portion 6 inside the front housing 21.

The motor housing 22 has a cylindrical shape extending in the front-rear direction. The motor housing 22 is an indivisible integral body (single component). The motor housing 22 houses the motor 3 and a part of the power transmission unit 5 inside the motor housing 22. The rear portion of the motor housing 22 is connected to the front portion of the rear housing 23. The motor housing 22 has a front cylinder portion 22A and a rear cylinder portion 22B.

The front cylinder portion 22A forms the front portion of the motor housing 22, and four groove portions 22a are formed on the outer peripheral surface of the front cylinder portion 22A. The groove portion 22a is formed so as to extend in the front-rear direction and to be recessed inward in the radial direction of the motor housing 22. The four groove portions 22a are formed so as to be arranged at equal intervals in the circumferential direction.

Further, two protrusions 221 are provided on the outer peripheral surface of the front cylinder portion 22A at the same positions as the groove portion 22a in the front-rear direction.

The two protrusions 221 are formed so as to extend in the front-rear direction and project outward in the radial direction of the motor housing 22 in a substantially rectangular shape. The protrusion 221 and the groove 22a have the same length in the front-rear direction. One of the two protrusions 221 extends upward from the upper end of the outer peripheral surface of the motor housing 22, and the other one extends downward from the lower end of the outer peripheral surface of the motor housing 22.

The rear cylinder portion 22B is formed at the rear portion of the motor housing 22. The diameter of the outer peripheral surface of the rear cylinder portion 22B is smaller than the diameter of the outer peripheral surface of the front cylinder portion 22A. A protrusion 222 and a protrusion 223 are provided on the outer peripheral surface of the rear cylinder portion 22B so as to extend in the circumferential direction. The protrusion 223 is located behind the protrusion 222. The protrusions 222 and the protrusions 223 have an annular shape, and are provided so as to project outward in the radial direction of the rear cylinder portion 22B. The protrusion 222 has a protruding portion 222A at its front end. The protruding portion 222A is a portion extending outward in the radial direction from the protruding portion 222, and projects so as to extend in the circumferential direction.

A groove 22b and a groove 22c are formed on the outer peripheral surface of the rear cylinder 22B so as to extend in the circumferential direction. The groove portion 22b and the groove portion 22c have an annular shape and are formed so as to be recessed inward in the radial direction of the rear cylinder portion 22B. The groove 22b is located in front of the groove 22c. The boundary between the front cylinder portion 22A and the rear cylinder portion 22B forms a stepped portion, and the groove portion 22b is a recess defined by the stepped portion and the protruding portion 222A. The groove 22c is a recess defined by the protrusion 222 and the protrusion 223. The protrusion 222 is provided at a position between the groove 22b and the groove 22c in the front-rear direction.

The rear housing 23 has a half-split left housing 23L and a right housing 23R. The left housing 23L and the right housing 23R are configured to form a substantially cylindrical shape when connected to each other. Since the left housing 23L and the right housing 23R are formed substantially symmetrically with each other, only the right housing 23R will be described below, and the description of the left housing 23L will be omitted.

The right housing 23R has a front wall portion 238. On the inner peripheral surface of the right housing 23R, a protrusion 232, a protrusion 233, and a protrusion 234 protruding from the front wall portion 238 are provided so as to extend in the circumferential direction, respectively. The protrusion 232 forms the front wall portion 238 of the right housing 23R. The protrusion 233 is located behind 23B and the protrusion 234 is located behind 233. The protrusions 232, 233, and 234 are provided so as to project inward in the radial direction of the right housing 23R, and have a C shape in the front view. The amount of protrusion of the protrusions 232, 233, and 234 from the inner peripheral surface of the right housing 23R is substantially equal. The protrusions 232, 233, and 234 are provided at positions facing the groove 22b, the protrusion 222, and the protrusion 223, respectively.

A groove 23a and a groove 23b are formed on the inner peripheral surface of the right housing 23R so as to extend in the circumferential direction. The groove 23a is a recess defined by a protrusion 232 and a protrusion 233 and formed so as to extend in the circumferential direction of the inner peripheral surface of the right housing 23R. The groove portion 23a is provided at a position facing the protruding portion 222A of the motor housing 22. Specifically, the groove 23a is arranged so that its recess receives the protruding portion of the protruding portion 222A. The groove 23b is a recess defined by a protrusion 233 and a protrusion 234 and formed so as to extend in the circumferential direction of the inner peripheral surface of the right housing 23R. The groove portion 23b is formed at a position facing the groove portion 22c of the motor housing 22. The length of the groove 23b in the front-rear direction is substantially equal to the length of the groove 22c in the front-rear direction.

The protrusions 232, 233, and 234 are configured such that the right housing 23R and the left housing 23L are connected to each other, and the protruding portions from the inner peripheral surface of the rear housing 23 form an annular shape. Similarly, when the right side housing 23R and the left side housing 23L are connected to each other in the groove portion 23a and the groove portion 23b, the recesses from the inner peripheral surface of the rear housing 23 are configured to form an annular shape.

As shown in FIG. 3, two screw bosses 235 and 236 are provided on the inner peripheral surface of the right housing 23R. The screw bosses 235 and 236 are provided at substantially the same positions in the front-rear direction, and the screw bosses 235 are arranged above the screw bosses 236. The screw bosses 235 and 236 are each formed with screw holes extending in the left-right direction. The left housing 23L is also provided with two screw bosses (not shown) having screw holes. The two screw bosses are arranged at the same positions as the screw bosses 235 and 236 in the vertical direction and the front-rear direction, respectively.

The right housing 23R and the left housing 23L have the screw holes of the screw bosses 235 and 236 of the right housing 23R and the screw holes of the two screw bosses of the left housing 23L in a state where the two half-split housings are aligned in a tubular shape. They are connected to each other by screwing two screws together. Further, the controller box 41 and the main switch 42 housed in the internal space of the rear housing 23 are fixed to the inner peripheral surface of the rear housing 23 so as to be sandwiched from the left and right by the right housing 23R and the left housing 23L. There is.

The cylindrical portion 7 has a cylindrical shape extending in the front-rear direction and is formed as an integral body. The inner diameter of the cylindrical portion 7 is larger than the outer diameter of the front cylinder portion 22A of the motor housing 22. As shown in FIG. 4, four sets of two groove portions 7a and 7b arranged in the front-rear direction are formed on the inner peripheral surface of the cylindrical portion 7. The four sets of groove portions 7a and 7b are formed so as to extend in the front-rear direction and to be recessed outward in the radial direction from the inner peripheral surface of the cylindrical portion 7, and are formed so as to be arranged at equal intervals in the circumferential direction. The groove portion 7a is arranged in front of the groove portion 7b. The four sets of groove portions 7a and 7b are formed at positions facing the four groove portions 22a formed on the outer peripheral surface of the motor housing 22, respectively. The cylindrical portion 7 is an example of the “grip portion” in the present invention.

Specifically, the groove portion 7a is a groove extending rearward from the front end of the cylindrical portion 7, and the groove portion 7b is a groove extending forward from the rear end of the cylindrical portion 7. Further, the regulation protrusion 71 is formed by the wall portion that defines the rear portion of the groove portion 7a and the wall portion that defines the front portion of the groove portion 7b.

As shown in FIG. 4, two groove portions 7c are formed on the inner peripheral surface of the cylindrical portion 7. The two groove portions 7c are formed so as to extend in the front-rear direction and to be recessed outward in the radial direction of the cylindrical portion 7 in a substantially rectangular shape. The groove portion 7c has the same length as the protrusion 221 of the motor housing 22 in the front-rear direction, and is formed at a position facing the protrusion 221. One of the two groove portions 7c is recessed upward from the upper end portion of the inner peripheral surface of the cylindrical portion 7, and the other one is recessed downward from the lower end portion of the inner peripheral surface of the cylindrical portion 7.

Next, the positional relationship between the motor housing 22 and the rear housing 23 will be described. As shown in FIGS. 2, 3 and 5, the rear housing 23 has a motor housing 22 such that the front ends of the right housing 23R and the left housing 23L surround the rear cylinder 22B of the motor housing 22. It is connected to the. In other words, the half-split right housing 23R and the left housing 23L of the rear housing 23 are fixed to the rear tubular portion 22B of the motor housing 22 so as to have a tubular shape.

A second elastic body 9 is provided between the motor housing 22 and the rear housing 23. The second elastic body 9 is a rubber member and has a ring shape. The inner diameter of the second elastic body 9 is equal to the diameter of the bottom portion of the groove portion 22c of the motor housing 22 as a result of being assembled and compressed and deformed. Further, the outer diameter of the second elastic body 9 is equal to the diameter of the bottom portion of the groove portion 23b of the rear housing 23 as a result of being assembled and compressed and deformed. Further, the length of the second elastic body 9 in the front-rear direction is substantially equal to the length of the groove portion 22c and the groove portion 23b in the front-rear direction.

As described above, the groove portion 22b and the protrusion portion 232, the protrusion portion 222A and the groove portion 23a, the groove portion 22c and the groove portion 23b, and the protrusion portions 223 and 234 are arranged so as to face each other, but they are in contact with each other. It is not arranged at intervals in the vertical direction. In other words, since the motor housing 22 and the rear housing 23 are connected via the second elastic body 9, the contact between the motor housing 22 and the rear housing 23 is suppressed.

Further, the inner peripheral surface of the second elastic body 9 is in contact with the groove portion 22c, and the outer peripheral surface of the second elastic body 9 is in contact with the groove portion 23b. Specifically, in a state where the second elastic body 9 is arranged in the groove portion 22C of the motor housing 22, the outer peripheral surface of the second elastic body 9 and the bottom portion of the groove portion 23b are in contact with each other so that the rear housing 23 has a half-split shape 2. Two housings are connected. In other words, the rear housing 23 applies pressure inward in the radial direction with respect to the motor housing 22 via the second elastic body 9. That is, the rear end portion of the motor housing 22 is connected to the rear housing 23 via the second elastic body 9.

Further, the front portion of the second elastic body 9 is in contact with the rear walls of the protrusion 233 and the protrusion 222, and the rear portion of the second elastic body 9 is in contact with the front walls of the protrusion 234 and the protrusion 223. .. In other words, the movement of the motor housing 22 in the front-rear direction is restricted by the rear housing 23 via the second elastic body 9.

Next, the positional relationship between the motor housing 22 and the cylindrical portion 7 will be described. As shown in FIGS. 2 to 4, the cylindrical portion 7 is provided so as to surround the outer peripheral surface of the motor housing 22, particularly the front cylinder portion 22A. Specifically, the cylindrical portion 7 and the motor housing 22 are arranged so that the recess of the groove portion 7c of the cylindrical portion 7 receives the protrusion 221.

Eight first elastic bodies 8 are provided between the motor housing 22 and the cylindrical portion 7. The first elastic body 8 is a member made of rubber and has a substantially rectangular parallelepiped shape. The eight first elastic bodies 8 are composed of four front elastic bodies 8F and four rear elastic bodies 8R configured to have the same shape as each other. In each of the four groove portions 22a formed in the front cylinder portion 22A of the motor housing 22, one front elastic body 8F and one rear elastic body 8R are arranged at predetermined intervals in the front-rear direction. Further, as shown in FIG. 5, the rear end portion of the rear elastic body 8R is provided so as to be located behind the groove portion 22a. In other words, the rear end portion of the rear elastic body 8R is provided so as to be located behind the rear end portion of the groove portion 22a.

The front elastic body 8F and the rear elastic body 8R provided between the cylindrical portion 7 and the motor housing 22 are in contact with the groove portion 7a and the bottom surface of the groove portion 7b of the cylindrical portion 7, respectively (FIG. 5). That is, the first elastic body 8 is provided so as to be sandwiched between the motor housing 22 and the cylindrical portion 7.

As shown in FIG. 5, the front portion of the front elastic body 8F is in contact with the wall portion 224 defining the front end of the groove portion 22a in the front-rear direction. The rear portion of the front elastic body 8F is in contact with the front wall of the regulation protrusion 71 of the cylindrical portion 7. On the other hand, the front portion of the rear elastic body 8R is in contact with the rear wall of the regulation protrusion 71. Further, the rear end portion of the rear elastic body 8R protrudes rearward from the rear portion of the groove portion 22a and is in contact with the front wall portion 238 of the rear housing 23. In other words, the rear elastic body 8R is provided in a state of being compressed in the front-rear direction by the regulation protrusion 71 and the front wall portion 238.

With the second elastic body 9 provided between the groove 23b of the rear housing 23 and the groove 22c of the motor housing 22, the two half-split housings constituting the rear housing 23 are joined to each other. , The position of the rear housing 23 in the front-rear direction with respect to the motor housing 22 is determined. In this state, the length of the rear elastic body 8R in the front-rear direction is larger than the distance in the front-rear direction from the front wall portion 238 to the rear wall of the regulation protrusion 71 due to its natural length. , The rear elastic body 8R receives pressure in the forward direction from the front wall portion 238. The pressure in the front direction is transmitted to the regulation protrusion 71, the front elastic body 8F, and the wall portion 224 via the rear elastic body 8R. In other words, the front elastic body 8F and the rear elastic body 8R are sandwiched between the wall portion 224 and the front wall portion 238 from the front-rear direction in a state where the regulation protrusion 71 is arranged between them. As a result, the front elastic body 8F and the rear elastic body 8R are compressed in the front-rear direction, so that the regulation protrusion 71 of the cylindrical portion 7 arranged between the front elastic body 8F and the rear elastic body 8R is the front elastic body. It receives a backward pressure from the 8F and a forward pressure from the rear elastic body 8R. As a result, the movement of the cylindrical portion 7 in the front-rear direction is restricted. With such a configuration, since the cylindrical portion 7 is restricted from moving in the front-rear direction with respect to the motor housing 22 via the first elastic body 8, the case where the cylindrical portion 7 is fixed to the motor housing 22 by using a connecting member is used. In comparison, it is possible to suppress the increase in size of the cylindrical portion 7.

The protrusions 221 and the grooves 7c, which are provided so as to face each other, are not in contact with each other. Further, the regulation protrusions 71 and the groove 22a provided so as to face each other are not in contact with each other. In other words, the motor housing 22 and the cylindrical portion 7 are connected to each other via the first elastic body, so that direct contact between the motor housing 22 and the cylindrical portion 7 is suppressed.

Next, with reference to FIG. 1, the machining work on the work piece using the vibrating tool 1 according to the first embodiment of the present invention and the operation of the vibrating tool 1 during the machining work will be described.

When the battery pack Q is mounted on the battery mounting portion 237 of the rear housing 23 and the operator starts the slide switch 231 to turn on the main switch 42, the power of the battery pack Q is increased. Is supplied to the motor 3, and the rotating shaft 31 of the motor 3 rotates. On the other hand, when the slide switch 23B is released and the main switch 42 is turned off, the electric power of the battery pack Q is not supplied to the motor 3, and the rotating shaft 31 of the motor 3 is stopped.

When electric power is supplied to the motor 3, the rotating shaft 31 and the spindle 51 rotate integrally. When the spindle 51 rotates, the eccentric shaft 51A and the bearing 52 revolve around the axis A. When the bearing 52 revolves around the axis A, the swing arm 53 swings about the axis C within a predetermined angle. As a result, the tip tool P also swings within a range of a predetermined angle about the axis C. In this state, the operator can perform processing such as polishing by grasping the cylindrical portion 7 of the vibrating tool 1 and pressing the tip tool P against the work material. The operator can grip the rear housing 23 to perform processing such as polishing, but since it is easier to adjust the position of the tip tool P by gripping the position closer to the tip tool P, the operator grips the cylindrical portion 7. It is preferable to work with. As shown in FIG. 1, in the present embodiment, since the center of gravity G of the vibrating tool 1 is set to be inside the cylindrical portion 7 (at the same position in the front-rear direction), the work of gripping the cylindrical portion 7 is performed. It is configured to be easy to do.

Since the vibrating tool 1 is configured to convert the driving force of the motor 3 into the swinging motion of the tip tool P by the power transmission unit 5, vibration occurs during work around the motor 3 and the power transmission unit 5. Cheap. Further, the vibration generated by the operation of the motor 3 and the power transmission unit 5 is transmitted to the front housing 21 and the motor housing 22.

In the vibration tool 1 of the present embodiment, the cylindrical portion 7 and the rear housing 23, which are the portions gripped by the operator, are connected to the motor housing 22 via the first elastic body 8 and the second elastic body 9, respectively. Therefore, contact with the motor housing 22 is suppressed. Since the motor housing 22 in the present embodiment is an integral body and has higher durability than the split type, it can firmly support the motor 3 and the bearing 31A, and is more suitable for the motor housing than the split type. The generated vibration is less likely to occur. Here, in the case of a split type motor housing, it is possible to attenuate the vibration transmitted from the motor or the like to the motor housing by interposing an elastic body when sandwiching the motor or the like, but it is an indivisible integral. In the case of a motor housing that is a physical object, it becomes difficult to insert an elastic body between the motor and the inner surface of the motor housing. Therefore, in the present embodiment, a cylindrical portion 7 serving as a grip portion is provided around the motor housing 22 of the integral body, and is transmitted from the motor housing 22 to the cylindrical portion 7 by a first elastic body 8 arranged on the outer surface of the motor housing 22. Since the vibration is reduced, the vibration transmitted to the operator can be effectively dampened even in a configuration in which the periphery of the motor housing 22 as an integral body can be gripped. Further, in the present embodiment, since the cylindrical portion 7 is configured as an indivisible integral body, screws and screw bosses when assembling are not required as compared with the split type one, and the cylindrical portion 7 can be formed in a small size. it can. Therefore, the gripping portion becomes smaller, and the ease of holding can be improved. Further, since the positioning (movement in the front-rear direction) of the cylindrical portion 7 of the integral body is performed by the rear housing 23 elastically supported by the motor housing 22 via the second elastic body 9, even when the cylindrical portion 7 is positioned. It is possible to reduce the vibration transmitted to the operator.

Further, the first elastic body 8 provided between the cylindrical portion 7 and the motor housing 22 makes it possible to attenuate the vibration transmitted from the motor housing 22 to the cylindrical portion 7. Further, the second elastic body 9 provided between the rear housing 23 and the motor housing 22 makes it possible to attenuate the vibration transmitted from the motor housing 22 to the rear housing 23.

The vibration tool 1 in the present embodiment is connected to the motor 3, the power transmission unit 5 that transmits the driving force of the motor 3 to the output shaft 61, the motor housing 22 that houses the motor 3, and the front end portion of the motor housing 22. A front housing 21 for accommodating the power transmission unit 5, a rear housing 23 connected to the rear end of the motor housing 22, and a cylindrical portion 7 of an integral body provided so as to surround the outer peripheral surface of the motor housing 22. The vibration generated by the driving force of the motor 3 provided on the outer peripheral surface of the motor housing 22 and the cylindrical portion 7 whose movement in the front-rear direction is restricted by the rear housing 23 and transmitted from the motor 3 to the cylindrical portion 7 is generated. It has a first elastic body 8 configured to damp. With such a configuration, as compared with the case where the movement of the cylindrical portion 7 with respect to the motor housing 22 in the front-rear direction is restricted by using the connecting member, the vibration transmitted from the motor 3 is suppressed while suppressing the enlargement of the cylindrical portion 7. It becomes possible to attenuate. The front end portion of the motor housing 22 is an example of the "one end portion" in the present invention. The rear end portion of the motor housing 22 is an example of the "other end portion" in the present invention.

The rear housing 23 of the vibration tool 1 in the present embodiment has a half-split right housing 23R and a left housing 23L, and a motor so that the half-split right housing 23R and the left housing 23L are tubular. It is fixed to the rear end of the housing 22. The right side housing 23R is an example of the "first rear housing" in the present invention, and the left side housing 23L is an example of the "second rear housing" in the present invention. With such a configuration, it is possible to sandwich and fix a component such as a controller box between the right side housing 23R and the left side housing 23L.

The rear housing 23 of the vibration tool 1 in the present embodiment is provided so as to surround the rear end portion of the motor housing 22, and the second elastic body 9 is located between the inner peripheral surface of the rear housing 23 and the outer peripheral surface of the motor housing 22. It is provided in between. With such a configuration, it is possible to attenuate the vibration transmitted to the rear housing.

A protrusion 221 projects from the outer peripheral surface of the motor housing 22 of the vibration tool 1 in the present embodiment, and a groove portion 7c that can engage with the protrusion 221 is formed on the inner peripheral surface of the cylindrical portion 7, and the protrusion 221 is formed. The rotation of the cylindrical portion 7 with respect to the motor housing 22 is restricted by the engagement between the groove portion 7c and the groove portion 7. According to such a configuration, when the operator grips the outer peripheral surface of the cylindrical portion and works, the movement of the cylindrical portion with respect to the motor housing can be more reliably regulated, so that the operability is improved. Can be done. The groove portion 7c is an example of a "recess" in the present invention.

A plurality of first elastic bodies of the vibrating tool 1 in the present embodiment are provided side by side in the circumferential direction of the motor housing 22, and the protrusions 221 are located between the adjacent first elastic bodies. According to such a configuration, it is possible to more reliably attenuate the vibration as compared with the case where only one elastic body is provided.

A plurality of first elastic bodies 8 of the vibrating tool 1 in the present embodiment are provided side by side in the front-rear direction, the regulation protrusions 71 project from the inner peripheral surface of the cylindrical portion 7, and the regulation protrusions 71 are adjacent to each other in the front-rear direction. Intervening between the first elastic bodies 8, the rear housing 23 regulates the movement of the cylindrical portion 7 in the front-rear direction via the first elastic body 8. According to such a configuration, vibration in both the front-rear direction can be reduced inside the cylindrical portion 7, and the elastic body is not exposed to the outside, so that deterioration of the elastic body can be suppressed. Further, as compared with the case where the movement of the cylindrical portion 7 with respect to the motor housing 22 in the front-rear direction is restricted by using a separate connecting member, it is possible to attenuate the vibration transmitted from the motor while suppressing the enlargement of the cylindrical portion 7. It will be possible.

The rear housing 23 of the vibration tool 1 in the present embodiment is configured so that the battery pack Q can be attached. The rear housing 23 houses a controller box 41 that can be electrically connected to the battery pack Q, and the controller box 41 is sandwiched between the half-split right housing 23R and the left housing 23L. The controller box 41 is an example of the "terminal portion" in the present invention.

Next, a modified example of the first embodiment will be described with reference to FIG. In this modification, the cylindrical portion 70 is provided instead of the cylindrical portion 7, and the structure for restricting the movement of the cylindrical portion 70 in the front-rear direction is different from that of the first embodiment. In the first embodiment described above, a plurality of first elastic bodies 8 are provided between the cylindrical portion 7 and the motor housing 22, and the rear housing 23 of the cylindrical portion 7 is provided via the plurality of first elastic bodies 8. It regulates movement in the front-back direction. On the other hand, in this modification, the first elastic body 8 is not provided, and the front end portion of the rear housing 23 and the rear end portion of the cylindrical portion 70 engage with each other in the front-rear direction of the cylindrical portion 70. Movement is restricted. The cylindrical portion 70 is an example of the “grip portion” in the present invention.

As shown in FIG. 6, the cylindrical portion 70 has a locking portion 72 and a body portion 73. The body portion 73 is a main body portion of the cylindrical portion 70 and has a cylindrical shape. The inner peripheral surface of the body portion 73 faces the outer peripheral surface of the front cylinder portion 22A of the motor housing 22. The locking portion 72 projects from the rear wall of the body portion 73. The locking portion 72 extends rearward from the rear wall of the body portion 73 and has a substantially annular shape. The locking portion 72 has a protrusion 72A. The protrusion 72A protrudes outward in the radial direction and extends in the circumferential direction. A groove portion 72a extending in the circumferential direction is formed in the locking portion 72. The groove portion 72a is a recess defined by the protrusion 72A and the rear wall of the body portion 73, and is a recess extending in the circumferential direction.

Further, the right housing 23R of the rear housing 23 has a claw portion 239. The claw portion 239 is provided on the front wall portion 238 and has a substantially annular shape. The claw portion 239 has a protrusion 239A. The protrusion 239A projects inward in the radial direction and extends in the circumferential direction. A groove portion 239a extending in the circumferential direction is formed in the claw portion 239. The groove portion 239a is a recess defined by the protrusion portion 239A and the front wall portion 238. The protrusion 239A and the groove 239a are configured to be engageable with the groove 72a and the protrusion 72A, respectively.

By connecting the right side housing 23R and the left side housing 23L with screws in a state where the protrusion 239A and the groove 239a are engaged with the groove 72a and the protrusion 72A, the movement of the cylindrical portion 70 in the front-rear direction is restricted. Further, the inner peripheral surface of the body portion 73A of the cylindrical portion 70 and the outer peripheral surface of the motor housing 22 are not in contact with each other. With such a structure, the second elastic body 9 suppresses the transmission of vibration from the motor housing 22 to the cylindrical portion 70. Even with such a configuration, even if the motor housing 22 is configured as an indivisible integral by gripping the radial outer side of the motor housing 22, vibration transmitted from the cylindrical portion 70 to the operator is reduced. it can. Further, since the cylindrical portion 70 is made as an indivisible integral body, it is not necessary to provide screws, screw bosses, or the like, and it is possible to make the structure compact and easy to hold. Other basic effects are common to the vibration tool 1.

Next, the vibration tool 100, which is an example of the power tool according to the second embodiment of the present invention, will be described with reference to FIGS. 7 and 8. The same components and elements as those of the vibrating tool 1 in the vibrating tool 100 are designated by the same reference numerals and description thereof will be omitted, and only different configurations and elements will be described. Further, the same configurations and elements as those of the vibrating tool 1 in the vibrating tool 100 have the same effects as those of the vibrating tool 1.

As shown in FIG. 7, the vibrating tool 100 of the second embodiment includes a housing 102 having a shape different from that of the housing 2 of the vibrating tool 1. Further, the vibrating tool 100 includes a cylindrical portion 107 having a shape different from that of the cylindrical portion 7 of the vibrating tool 1.
Further, the vibrating tool 100 does not include the second elastic body 9 provided in the vibrating tool 1. Further, in the vibrating tool 100, the rear elastic body 8R is arranged at a position different from that of the vibrating tool 1.

The vibrating tool 100 includes a front rear housing 123 formed as an integral body instead of the rear housing 23 connecting the two half-split housings provided in the vibrating tool 1. Further, the vibrating tool 100 includes an internal housing 123A and a rear rear housing 124, which are not provided in the vibrating tool 1.

The front rear housing 123 has a cylindrical shape extending in the front-rear direction. The inner peripheral surface of the front end portion of the front rear housing 123 is provided so as to surround the outer peripheral surface of the rear cylinder portion 22B of the motor housing 22. Four groove portions 123a are formed on the outer peripheral surface of the front rear housing 123. The groove portion 123a is formed so as to extend in the front-rear direction and to be recessed inward in the radial direction of the front rear housing 123. The four groove portions 123a are formed so as to be arranged at equal intervals in the circumferential direction. Each of the four groove portions 123a is arranged at a position corresponding to the groove portion 22a of the motor housing 22. In other words, the corresponding set of groove portions 123a and groove portion 22a are configured to form one groove portion extending in the front-rear direction.

As shown in FIG. 8, the front rear housing 123 houses the internal housing 123A. The controller box 41 and the like are housed in the internal housing 123A. The front portion of the inner housing 123A is connected to the motor housing 22 by a screw S extending in the front-rear direction. The rear portion of the inner housing 123A is connected to the rear portion of the front rear housing 123 by a screw S extending in the front-rear direction. In other words, the front rear housing 123 is fixed to the motor housing 22 via the inner housing 123A.

The rear rear housing 124 has a half-split left housing 124L and a right housing 124R. The left housing 124L and the right housing 124R are configured to form a substantially cylindrical shape when connected to each other. A battery mounting portion 1241 is provided at the rear portion of the rear rear housing 124. The left housing 124L and the right housing 124R are formed substantially symmetrically with each other.

The rear rear housing 124 is connected to the rear end of the front rear housing 123 with screws or the like in a state where the half-split right housing 124R and the left housing 124L are aligned in a tubular shape. In other words, the rear rear housing 124 is fixed to the front rear housing 123 so that the inner peripheral surface of the front end portion surrounds the outer peripheral surface of the rear end portion of the front rear housing 123.

The length of the cylindrical portion 107 in the front-rear direction is configured to be larger than the length of the cylindrical portion 7 of the vibrating tool 1 in the front-rear direction. Specifically, the cylindrical portion 107 is configured to cover most of the outer peripheral surfaces of the motor housing 22 and the front rear housing 123. Further, also in the present embodiment, the position of the center of gravity G is located inside the grip portion (cylindrical portion 107), but the detailed position is omitted.

As shown in FIG. 7, the rear elastic body 8R is arranged in the groove portion 123a. Specifically, in the compressed state of the rear elastic body 8R, the bottom surface of the rear elastic body 8R is in contact with the groove portion 123a, and the rear portion of the rear elastic body 8R is in contact with the front wall portion 1238 of the front rear housing 123. .. The rear elastic body 8R is arranged in a compressed state between the regulation protrusion 71 and the front wall portion 1238, and applies forward pressure to the regulation protrusion 71.

Although the first embodiment of the present invention, the modified example of the first embodiment, and the second embodiment have been described in detail above, the power tool according to the present invention is limited to the above-described embodiment. However, various modifications can be made within the scope of the gist of the invention described in the claims.

For example, in the vibrating tool 1 of the first embodiment, eight first elastic bodies are provided on the outer periphery of the motor housing 22, but four may be provided. Further, although the cylindrical portion to be the grip portion is a tubular integral body from the viewpoint of durability and the like, a partial notch may be provided, for example, as a partially tubular member having a C-shaped cross section. good.

Further, although the vibrating tool 1 of the above embodiment is operated by the direct current supplied from the battery pack Q, it may be operated by a commercial AC power source. Further, the motor 3 does not have to be a brushless motor, and may be a brushed motor.

1,100 ... Vibration tool 2 ... Housing 21 ... Front housing 22 ... Motor housing 23 ... Rear housing 123 ... Front rear housing 124 ... Rear rear housing 123A ... Internal housing 3 ... Motor 4 ... Control unit 5 ... Power transmission unit 6 ... Output shaft 61 ... Output shaft 7 ... Cylindrical part 71 ... Regulatory protrusion 8 ... 1st elastic body 9 ... 2nd elastic body P ... Tip tool

Claims (9)

With the motor
A power transmission unit that transmits the driving force of the motor to the output shaft,
A motor housing that houses the motor and
A front housing connected to one end of the motor housing and accommodating the power transmission unit,
The rear housing connected to the other end of the motor housing and
A grip portion of an integral body provided so as to surround the outer peripheral surface of the motor housing, and a grip portion whose movement in a direction connecting the one end portion and the other end portion is restricted by the rear housing.
A power characterized by having an elastic body provided on an outer peripheral surface of the motor housing and configured to attenuate vibration generated by a driving force of the motor transmitted from the motor to the grip portion. tool. The rear housing has a half-split first rear housing and a second rear housing, and the other of the motor housing so that the half-split first rear housing and the second rear housing have a tubular shape. The power tool according to claim 1, wherein the power tool is fixed to an end portion. The rear housing is provided so as to surround the other end of the motor housing, and the elastic body is provided between the inner peripheral surface of the rear housing and the outer peripheral surface of the motor housing. The power tool according to claim 2. The grip portion is cylindrical and has a cylindrical shape.
A protrusion protrudes from the outer peripheral surface of the motor housing, and a recess that can be engaged with the protrusion is formed on the inner peripheral surface of the grip portion, and the grip portion is engaged with the protrusion and the recess. The power tool according to any one of claims 1 to 3, wherein the rotation of the motor housing is restricted. The power tool according to claim 4, wherein a plurality of the elastic bodies are provided side by side in the circumferential direction of the motor housing, and the protrusions are located between adjacent elastic bodies. A plurality of the elastic bodies are provided side by side in the direction connecting the one end portion and the other end portion of the motor housing.
A regulating protrusion protrudes from the inner peripheral surface of the grip portion, the regulating protrusion is interposed between the adjacent elastic bodies arranged in a direction connecting the one end portion and the other end portion, and the rear housing holds the elastic body. The power tool according to claim 5, wherein the movement of the grip portion in a direction connecting the one end portion and the other end portion is restricted. The rear housing is configured so that a battery can be attached, and the rear housing accommodates a terminal portion that can be electrically connected to the battery, and the terminal portion is a half-split first rear housing and a second rear housing. The power tool according to claim 2, wherein the power tool is sandwiched between the rear housing and the rear housing. With the motor
A power transmission unit that transmits the driving force of the motor to the output shaft,
A motor housing that houses the motor and is an indivisible integral
A front housing connected to one end of the motor housing and accommodating the power transmission unit,
The rear housing connected to the other end of the motor housing and
A grip portion provided so as to surround the outer peripheral surface of the motor housing, wherein movement in a direction connecting the one end portion and the other end portion is restricted by the rear housing.
A power characterized by having an elastic body provided on an outer peripheral surface of the motor housing and configured to attenuate vibration generated by a driving force of the motor transmitted from the motor to the grip portion. tool. The power tool according to any one of claims 1 to 8, wherein the position of the center of gravity is located inside the grip portion.

Images