Work machine

Abstract

The invention improves the workability of a working machine. A working machine (10) is provided with a motor unit (11) including an electric motor, a battery pack (13) for supplying power to the electric motor, a mounting unit (16) for mounting the battery pack (13), a drive unit (20) connected to the motor unit (11), a cover (15) for covering the drive unit (20), an output shaft (30) supported by the drive unit (20), a tip tool (52) attached to the tip of the output shaft (30), and a housing (14) for housing the motor unit (11). In a working machine (10), a drive unit (20) and a cover (15) are connected via a U-shaped elastic member (22), and a motor unit (11) and a housing (14) are not connected via an elastic body.

Description

Technical Field

[0001] The invention relates to a working machine. Background Art

[0002] As an example of a working machine, there is known a working machine including an electric motor unit, a driving unit connected to the motor unit, a housing accommodating the motor unit, and a tip tool actuated by the driving force of the motor unit.

[0003] As the above-mentioned working machine, for example, Patent Document 1 discloses a working machine that performs machining by causing a tip tool attached to an output shaft of a driving portion to vibrate left and right (reciprocate).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2015-127075 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the working machine described in Patent Document 1, the operator holds a part of the housing to perform processing, but vibration is transmitted from the drive unit to the housing, and the vibration of the housing increases. As a result, the vibration transmitted to the operator also increases, resulting in reduced workability.

[0009] Therefore, it is desired to reduce the vibration transmitted to the operator during machining and improve the operability of the working machine.

[0010] An object of the present invention is to provide a working machine with improved workability.

[0011] Solutions to Solve Problems

[0012] The working machine of the present invention comprises: a motor part; a driving part connected to the motor part; an output shaft supported by the driving part; and a housing that accommodates the motor part, wherein the driving part and the housing are connected via an elastomer and the motor part and the housing are not connected via the elastomer, or the driving part and the housing are not connected via the elastomer and the motor part and the housing are connected via the elastomer.

[0013] The effects of the invention are as follows.

[0014] According to the present invention, the operability of the working machine can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a side sectional view showing the structure of the working machine according to Embodiment 1 of the present invention.

[0016] Figure 2 It is shown Figure 1 A cross-sectional view of the configuration structure of the elastic body in the working machine.

[0017] Figure 3 It is shown assembled in Figure 1 A three-dimensional diagram of the structure of the elastic body of the working machine.

[0018] Figure 4 It is shown embedded Figure 3 A partial stereoscopic view of the structure of the driving part of the elastic body.

[0019] Figure 5 It is shown in Figure 4 A partial stereoscopic view of a state in which an elastic body is embedded in a driving portion.

[0020] Figure 6 It is shown in a horizontal section. Figure 5 A sectional stereogram of the structure.

[0021] Figure 7 It is a cross-sectional view showing the structure of a working machine according to a first modified example of the embodiment of the present invention.

[0022] Figure 8 It is shown Figure 7 A cross-sectional view showing the configuration structure of an elastic body in a working machine.

[0023] Fig. 9 yes Figure 8 AA section view in.

[0024] Fig.10 It is shown Fig. 9 A three-dimensional view of the structure of the rear extension portion of the working machine.

[0025] Fig.11 is shown cut in the vertical direction Fig.10 A sectional stereogram of the rear extension of .

[0026] Fig.12 It is shown in a horizontal section. Fig.11 A sectional stereogram of the rear extension of .

[0027] Fig.13 It is a cross-sectional view showing an arrangement structure of elastic bodies in a working machine according to a second modified example of the embodiment of the present invention.

[0028] Fig.14 It is shown Fig.13 A three-dimensional view of the structure of the rear extension portion of the working machine.

[0029] Fig.15 is shown cut in the vertical direction Fig.14 A sectional stereogram of the rear extension of .

[0030] Fig.16 is shown cut in the horizontal direction Fig.14 A sectional stereogram of the rear extension of .

[0031] Fig.17 It is a cross-sectional view showing an arrangement structure of elastic bodies in a working machine according to a third modified example of the embodiment of the present invention.

[0032] Fig.18 It is shown Fig.17 A three-dimensional view of the structure of the rear extension portion of the working machine.

[0033] Fig.19 is shown cut in the vertical direction Fig.18 A sectional stereogram of the rear extension of .

[0034] Fig. 20 is shown cut in the horizontal direction Fig.18 A sectional stereogram of the rear extension of . DETAILED DESCRIPTION

[0035] Hereinafter, the embodiments of the present invention will be described in detail using the accompanying drawings. In the multiple drawings used in the description of each embodiment, the same elements are marked with the same symbols. In this embodiment, as an example of a working machine, an electric working machine that drives a front end tool using an electric motor is described.

[0036] Figure 1 The working machine 10 shown is also called a multi-function tool, etc., and includes a device body 12 that accommodates a motor unit 11 (electric motor 11a and motor housing 11b) and a battery pack 13 that supplies power to the electric motor 11a. The battery pack 13 can be attached to and detached from the device body 12. The working machine 10 is a cordless type in which a power cord connected to a socket of a commercial power source is not provided in the device body 12. In addition, in the cross-sectional view, the components are hatched to clearly show their positional relationship.

[0037] The device body 12 has a shell (outer shell) 14 through which the first axis A1 passes (extending in the direction of the first axis A1) and a cover (shell, outer shell) 15 arranged at one end (front end) of the shell 14 in the direction along the first axis A1. The shell 14 and the cover 15 are integrated (a single component connected as one), and the cover 15 covers the drive unit (head) 20 connected to the motor unit 11. That is, the shell portion located in front of the motor unit 11 is the cover 15. The motor unit 11 and the drive unit 20 are connected integrally by fixing elements such as screws. The shell 14 is cylindrical and has an assembly portion 16. The assembly portion 16 is provided on the side opposite to the end to which the cover 15 is installed in the direction along the first axis A1. The battery pack 13 is loaded and unloaded relative to the assembly portion 16. A gripping portion 14a having a smaller diameter than the diameter of the portion that accommodates the electric motor 11a is provided in the shell 14. The operator can grip the gripping portion 14a to perform the operation. The housing 14 and the cover 15 are integral (a single component connected as one), but are configured to be divisible in the left-right direction. Furthermore, the housing 14 and the cover 15 are made of resin. Furthermore, although not shown in the figure, an elastic portion (elastomer) is provided on the outer surface of the housing 14 and the cover 15 (mainly around the gripping portion 14a) by integral molding for the purpose of improving the gripping force. The technology of integrally molding an elastic portion (elastomer) in a housing made of resin is a well-known technology. The electric motor 11a as a power source is provided in the housing 14 in a state of being accommodated in the motor housing 11b. The electric motor 11a has a motor shaft 17. The main switch 18 is provided in the housing 14, and the sliding switch 19 operated by the operator is provided on the outer wall of the housing 14 (in front of the gripping portion 14a). The sliding switch 19 can move along the housing 14, and the movement can turn the main switch 18 on and off. Furthermore, a controller 21 is provided in the housing 14. The controller 21 is a well-known microcomputer including a drive circuit, a calculation unit, a storage unit, an input port, an output port, and the like.

[0038] A bracket 29 made of synthetic resin is provided in the housing 14 (cover 15). The front end of the bracket 29 is connected to a driving portion housing rear end 11d described below, and the motor shaft 17 is rotatably supported by the bracket 29 via a bearing 11c.

[0039] The drive unit 20 is housed in the cover 15. The drive unit 20 has a drive unit housing 20a, and the output shaft 30 is supported (housed) in the drive unit housing 20a. The drive unit housing 20a is made of metal. The output shaft 30 is cylindrical and supported by the drive unit housing 20a in a manner that does not move in the direction along the second axis B1.

[0040] In addition, a power transmission mechanism 35 is provided in the drive unit housing 20a. The power transmission mechanism 35 is a mechanism that converts the rotational force of the motor shaft 17 into a force that causes the output shaft 30 to reciprocate within a predetermined angle range. The power transmission mechanism 35 includes a main shaft 36 that rotates integrally with the motor shaft 17. The main shaft 36 is provided concentrically with the motor shaft 17. The center line of the main shaft 36 is coaxial with the first axis A1 of the motor shaft 17, and an eccentric shaft 39 is provided on the main shaft 36. The center line of the eccentric shaft 39 is arranged at a position eccentric from the first axis A1. The inner ring of the ball bearing 40 is mounted on the outer peripheral surface of the eccentric shaft 39.

[0041] A rocker arm 41 is provided to connect the outer ring of the ball bearing 40 and the output shaft 30. The rocker arm 41 is fixed to the output shaft 30. The rocker arm 41 is formed in a U-shape with a pair of arm portions extending parallel to the motor shaft 17. The pair of arm portions are arranged at intervals equal to the outer diameter of the outer ring of the ball bearing 40. The pair of arm portions are in contact with the outer ring of the ball bearing 40. In other words, the outer ring of the ball bearing 40 is sandwiched between the pair of arm portions.

[0042] Furthermore, the drive unit 20 has a first shaft 42 disposed in the drive unit housing 20a and movable in the direction along the second axis B1. The drive unit 20 also has a second shaft 46 disposed in the output shaft 30. One end of the second shaft 46 in the direction along the second axis B1 is fixed to the first shaft 42. Therefore, the first shaft 42 and the second shaft 46 can move integrally in the direction along the second axis B1. In other words, the first shaft 42 and the second shaft 46 can move in the length direction.

[0043] Furthermore, a tool fixing member 55 is provided at the front end of the second shaft 46, and the front end tool 52 is clamped by the tool fixing member 55 and the output shaft 30, so that the front end tool 52 is assembled on the output shaft 30. In addition, the loading and unloading structure of the front end tool 52 in this embodiment is the same as the loading and unloading structure described in the prior art document, so a more detailed description is omitted.

[0044] Furthermore, in the working machine 10, when the battery pack 13 is mounted on the mounting portion 16, if the operator operates the slide switch 19 to turn on the main switch 18, the power of the battery pack 13 is supplied to the electric motor 11a via the controller 21, and the motor shaft 17 of the electric motor 11a rotates. On the other hand, if the slide switch 19 is operated to turn off the main switch 18, the power of the battery pack 13 is no longer supplied to the electric motor 11a, and the motor shaft 17 of the electric motor 11a stops.

[0045] In the working machine 10, if power is supplied to the electric motor 11a and the motor shaft 17 rotates in one direction, the motor shaft 17 and the main shaft 36 rotate together. If the main shaft 36 rotates, the eccentric shaft 39 and the ball bearing 40 revolve around the first axis A1. If the ball bearing 40 revolves around the first axis A1, the rocker arm 41 reciprocates (sways) within a predetermined angle range with the output shaft 30 as a fulcrum. Therefore, the output shaft 30 alternately rotates forward and reverse within a predetermined angle range with the second axis B1 as the center. In this way, the rotational force of the electric motor 11a is converted into the rotational force (vibration force) of the output shaft 30.

[0046] When the output shaft 30 rotates forward and reverse within a predetermined angle range, the tip tool 52 also rotates around the second axis B1 within a predetermined angle range. When the tip tool 52 is pressed against an object, the object can be processed, such as cut or polished.

[0047] Next, the vibration countermeasures of the working machine 10 of the present embodiment are described. In the working machine 10, the motor part 11 and the drive part 20 are connected integrally by a fixing element 50 such as a screw. That is, the motor part 11 and the drive part 20, which are respectively configured as different components, are formed into one body and supported by the outer shell (shell 14, cover 15) as the inside (drive unit). Therefore, in the working machine 10, the motor part 11 and the drive part 20 vibrate integrally during operation. Therefore, it is necessary to consider reducing the vibration transmitted to the operator. Regarding vibration, in the case of the structure of the present embodiment, vibration in the left and right direction is generated due to the reciprocating motion of the output shaft 30 and the rocker arm 41 in the left and right directions. In addition, since the rocker arm 41 vibrates in the left and right directions with the second axis B1 as the center, movement in the front and rear directions (especially the rear end part) is also generated, and vibration in the front and rear directions is also generated due to this movement. Compared with the left and right directions and the front and rear directions, the vibration becomes smaller in the up and down directions. When considering vibration, it is considered to arrange an elastic body (shock absorber) between the vibration source and the operator's hand (grip 14a), but since the vibration source can move relative to the grip 14a (housing 14), it is important to limit its relative movement while reducing vibration. In addition, regarding the vibration source, the amplitude may vary depending on the location. In the working machine 10 of this embodiment, Figure 2As shown, the drive unit 20 and the cover 15 are connected via an elastomer. In other words, the drive unit 20 (drive unit housing 20a) is supported by the cover 15 (housing body) via the elastomer. Moreover, it is configured so that no elastomer is interposed between the motor unit 11 and the housing 14. That is, there is a space between the motor unit 11 and the housing 14 (that is, the motor unit 11 and the housing 14 are separated). In more detail, the outer surface of the motor unit 11 (motor housing 11b) is in a state of not contacting the housing 14. In this embodiment, as an example of an elastomer, a case where the elastomer is a U-shaped elastic member 22 is described. That is, the drive unit 20 and the cover 15 are connected via the U-shaped elastic member 22. In addition, regarding the U-shaped elastic member 22, in order to facilitate understanding of the positional relationship, hatching is also applied to parts other than the cross-sectional portion. As shown Figure 4 As shown, the drive unit 20 (drive unit housing 20a) is formed into a substantially cylindrical shape, and a U-shaped elastic member 22 is provided along the outer periphery of the cylindrical drive unit 20. When expressed in different expressions, such as Figure 5 and Figure 6 As shown, the U-shaped elastic member 22 is arranged to surround the outer periphery of the cylindrical drive unit 20. On the other hand, the motor unit 11 (electric motor 11a) is not connected to the housing 14 via an elastic body (separated from the outer housing). In addition, the elastic body (shock absorber) described in this application refers to a material having the property of being deformed by an external force and restoring when the external force is eliminated. For example, it is rubber, polyurethane, sponge, spring, etc.

[0048] Here, the U-shaped elastic member 22 assembled in the working machine 10 is described. The U-shaped elastic member 22 is an elastic body made of a rubber material, etc. Figure 3 As shown, it includes a first elastic body 23 and a second elastic body 24 arranged at different positions in a direction intersecting the left-right direction. Specifically, the U-shaped elastic member 22 includes a first elastic body 23 and a second elastic body 24 arranged at different positions in a direction intersecting the left-right direction (front-back direction or up-down direction). The first elastic body 23 is a curved portion of the U-shaped elastic member 22, and the second elastic body 24 is a substantially straight portion of the U-shaped elastic member 22. At least in the front-back direction, the first elastic body 23 and the second elastic body 24 are arranged at different positions. That is, in this embodiment, as a vibration reduction mechanism connected to the drive unit 20, there is a first elastic body 23 and a second elastic body 24 arranged at different positions in a direction intersecting the left-right direction.

[0049] The U-shaped elastic member 22 includes a left elastic body 28 disposed on the left side of the driving unit 20 and a right elastic body 27 disposed on the right side of the driving unit 20 . In the U-shaped elastic member 22 , the left elastic body 28 and the right elastic body 27 are integrated.

[0050] Moreover, any one of the first elastic body 23 and the second elastic body 24 includes a protrusion (first elastic part) 25 connected to any one of the cover 15 and the driving part 20 and having a first elastic modulus, and a base (second elastic part) 26 connected to any other of the cover 15 and the driving part 20 and having a second elastic modulus greater than the first elastic modulus. In the U-shaped elastic component 22, specifically, the U-shaped bases 26 are arranged in an up-and-down arrangement, and protrusions 25 protruding outward are provided at multiple locations on the outer periphery of each U-shaped base 26. The multiple protrusions 25 have smaller elastic moduli due to their smaller areas. That is, when the elastic modulus of the protrusion 25 is set to the first elastic modulus and the elastic modulus of the base 26 is set to the second elastic modulus, the first elastic modulus is less than the second elastic modulus, and the protrusion 25 is softer than the base 26. In other words, the base 26 is harder than the protrusion 25.

[0051] The U-shaped elastic member 22 has a connecting portion 26a that connects two bases 26 arranged in a vertical arrangement, and has a first opening 22a, a second opening 22b, and a third opening 22c as openings in a portion surrounded by the base 26 and the connecting portion 26a. The first opening 22a and the second opening 22b are arranged substantially corresponding to the region of the first elastic body 23, and the third opening 22c is arranged substantially corresponding to the region of the second elastic body 24. An internal protrusion 25a that protrudes from the connecting portion 26a toward the inner side of each of the first opening 22a, the second opening 22b, and the third opening 22c is arranged between the two bases 26 arranged in a vertical arrangement.

[0052] like Figure 5 and Figure 6 As shown in FIG. 1 , the U-shaped elastic member 22 is arranged to surround the outer periphery of the cylindrical drive unit 20. Therefore, in the working machine 10, the U-shaped elastic member 22 includes portions respectively arranged on the left side, the right side, and the front side of the drive unit 20. Figure 4 As shown in FIG. 1 , the outer periphery of the cylindrical driving portion 20 is provided with protruding flange portions 20c arranged in two rows in the upper and lower directions. Furthermore, the outer periphery of the driving portion 20 is provided with a protruding portion 20b protruding in the left and right directions between the flange portions 20c arranged in two rows in the upper and lower directions. Figure 5 As shown in FIG. 1 , the U-shaped elastic member 22 is fitted between the flanges 20c arranged in two rows. At this time, the protrusion 20b of the driving unit 20 is fitted into the second opening 22b of the U-shaped elastic member 22.

[0053] Furthermore, the first elastic body 23, which is the curved portion of the U-shaped elastic member 22, is located between the drive unit 20 and the cover 15 in the front-rear direction. Furthermore, the right elastic body 27 of the U-shaped elastic member 22 is located between the drive unit 20 and the cover 15 on the right side of the drive unit 20 in the left-right direction. On the other hand, the left elastic body 28 of the U-shaped elastic member 22 is located between the drive unit 20 and the cover 15 on the left side of the drive unit 20 in the left-right direction. Furthermore, as Figure 6 As shown, the front rib 15 a of the cover 15 is fitted into the first opening 22 a of the U-shaped elastic member 22 , and the side rib 15 b of the cover 15 is fitted into the third opening 22 c of the U-shaped elastic member 22 .

[0054] Furthermore, in the first opening 22a, the front ribs 15a of the cover 15 engage with the inner protrusions 25a on both sides of the first opening 22a. Similarly, in the third opening 22c, the side ribs 15b of the cover 15 engage with the inner protrusions 25a on both sides of the third opening 22c. Furthermore, in the second opening 22b, the protrusions 20b on the left and right sides of the drive unit 20 engage with the inner protrusions 25a on both sides of the second opening 22b.

[0055] Furthermore, the base 26 inserted between the protruding upper and lower flange portions 20c of the drive unit 20 is sandwiched between the cover 15 and the drive unit 20 in the vertical direction because the front rib 15a of the cover 15 is inserted between the upper and lower bases 26. In other words, the base 26 of the U-shaped elastic member 22 engages (contacts) with the cover 15 and the drive unit 20 in the vertical direction.

[0056] Furthermore, the protrusions 25 provided at a plurality of locations on the outer periphery of the base 26 are located between the cover 15 and the drive unit 20 in the front-rear direction or the left-right direction. Specifically, the plurality of protrusions 25 provided on the outer periphery of the base 26 engage with the cover 15 and the drive unit 20 via the base 26 in the front-rear direction, and also engage with the cover 15 and the drive unit 20 via the base 26 in the left-right direction.

[0057] According to the above structure, in the working machine 10, a U-shaped elastic member 22 is provided, so that the propagation of the vibration generated by the drive unit 20 to the cover 15 can be reduced in the up-down, front-back and left-right directions. That is, the vibration transmitted to the operator during processing can be reduced to improve the operability of the working machine 10. In addition, in the present embodiment, the U-shaped elastic member 22 is provided only on the driving unit 20 side, and no elastic body is sandwiched on the motor unit 11 side. Therefore, the number of components of the elastic body assembled in the working machine 10 can be reduced, thereby reducing the vibration of the working machine 10 and achieving cost reduction of the working machine 10. In addition, according to the present embodiment, the vibration transmission path does not include the motor unit 11. In this way, the vibration transmission path starts only from the front end portion of the housing 14, and the distance required for the vibration transmission from the vibration source to the gripping portion 14a located at the rear can be obtained to a large extent. In combination with the housing 14 being made of resin (and an elastic portion for improving the gripping performance), the vibration transmitted to the gripping portion 14a can be further reduced. Furthermore, even when the periphery of the motor portion 11 is gripped, the vibration is reduced, although not as much as the grip portion 14a.

[0058] In addition, in the working machine 10, the vibration in the up-down direction is smaller than the vibration in the front-back direction and the left-right direction. Therefore, the hard base 26 of the U-shaped elastic component 22 is embedded between the upper and lower flange portions 20c of the driving unit 20, so that the movement of the working machine 10 in the up-down direction during processing can be easily controlled. That is, in the up-down direction, the driving unit 20 is engaged with the hard (large elastic modulus) base 26, so it is easy to control when the working machine 10 is moved in the up-down direction. That is, the driving unit 20 is supported by a soft (small elastic modulus) elastic body in the direction of larger vibration (left-right direction or front-back direction), and is supported by a hard (large elastic modulus) elastic body in the direction of smaller vibration (up-down direction), so that both ease of control and low vibration can be achieved. Furthermore, after the front end tool 52 is pressed in, the drive unit 20 and the motor unit 11 want to rotate around the intersection of the first axis A1 and the second axis B1 (the support part of the drive unit 20) (with the left and right direction as the axis), but since the drive unit 20 is engaged with the hard (large elastic modulus) base 26, its movement can be suppressed, thereby improving the operability (control performance). This rotation is mainly a movement in the up and down direction. In particular, since the elastic body includes the first elastic body 23 and the second elastic body 24 arranged at different positions in the direction intersecting the left and right direction, the rotation can be appropriately restricted.

[0059] Furthermore, since the cover 15 is engaged with the soft inner protrusion 25a of the U-shaped elastic member 22 in the front-rear direction by the front rib 15a and the side rib 15b, vibration in the front-rear direction can be effectively reduced.

[0060] Furthermore, the first elastic body 23 of the U-shaped elastic member 22 is located between the drive unit 20 and the cover 15 in the front-to-back direction and is engaged with the drive unit 20 and the cover 15. In other words, since the first elastic body 23 of the U-shaped elastic member 22 is arranged on the front side of the drive unit 20, the vibration of the working machine 10 in the front-to-back direction is more effectively reduced.

[0061] In addition, in the U-shaped elastic member 22, the right elastic body 27 and the left elastic body 28 are integrally structured via the first elastic body 23. Therefore, when the U-shaped elastic member 22 is assembled to the drive unit 20, it is sufficient to only insert the U-shaped elastic member 22 into the outer peripheral portion of the drive unit 20, which can improve the assemblability of the working machine 10. Moreover, since the vibration reduction in the front-back direction and the left-right direction can be achieved only with the U-shaped elastic member 22 as a single component, the vibration reduction can be achieved while suppressing the number of components.

[0062] Next, a working machine 10 according to a first modified example of the present embodiment will be described.

[0063] As a vibration reduction measure, Figure 7 to Figure 10 The working machine 10 of the first modified example shown is a structure in which an elastic body is provided on the motor part 11 side at the rear side. No elastic body is provided on the drive part 20 side at the front side. That is, the drive part 20 and the cover 15 are not connected via an elastic body, and the motor part 11 and the housing 14 are connected via an elastic body. Specifically, an elastic body 32a is sandwiched between the motor part 11 (motor housing 11b) and the housing 14, and on the other hand, the drive part 20 is directly connected to the cover 15, or connected via other components (for example, the same resin material as the housing 14) having a greater rigidity than the elastic body 32a. Therefore, in the first modified example, it is also possible to achieve a reduction in the number of components of the elastic body in the same manner as in the above-mentioned embodiment. A recess 20d is formed on the side of the drive part 20, and a protrusion 14d formed on the housing 14 engages (fits) with the recess 20d, so that the drive part 20 is non-elastically connected to the housing 14. In the case of this embodiment, the recess 20d is separate from the drive part 20 and is fixed to the drive part 20 by an adhesive method. The recessed portion 20d is made of resin, which is the same material as the housing 14. The protruding portion 14d is formed on the inner wall of the housing 14, and is an integral structure that cannot be separated from the housing 14. In particular, a gap in the front-to-back direction is formed between the recessed portion 20d and the protruding portion 14d, and the interior can move relative to the housing 14 in the front-to-back direction due to the gap. Moreover, due to the gap, the interior (the driving unit composed of the driving portion 20 and the motor portion 11) can swing relatively to the housing 14, although slightly, with the position of the recessed portion 20d as a fulcrum. As a result, the interior can swing the rear end portion up and down or left and right (at the same time, the front end portion moves in the opposite direction) with the recessed portion 20d as a fulcrum. The recessed portion 20d can also be formed integrally with the driving portion 20.

[0064] In the working machine 10 of the first modified example, the motor housing 11b has a rear extension portion 31 extending rearward from the rear end of the motor portion 11, and an elastic body 32a is interposed between the rear extension portion 31 and the housing 14. Fig.11 and Fig.12 As shown in the figure, an annular elastic body 32a is embedded in the rear extension 31 of the motor part 11. Moreover, a shaft 33 is embedded in the hole of the annular elastic body 32a. The central part of the shaft 33 becomes a large diameter part 33b with a larger diameter, and the left and right parts of the large diameter part 33b become small diameter parts 33a with a smaller diameter than the large diameter part 33b. Moreover, both ends of the shaft 33 are engaged with the inner wall of the housing 14 and supported by the housing 14. That is, the motor part 11 is supported by the housing 14 via the annular elastic body 32a and the shaft 33.

[0065] In the working machine 10 of the first modified example, the rear extension 31 is provided at the rear of the motor housing 11b, and the portion (the portion on the rear side of the electric motor 11a) away from the vibration center of the drive unit 20 and the like can be supported via the elastic body 32a. Thus, it is possible to achieve reduction in vibration in the up-down, left-right, and front-back directions. More specifically, when the interior vibrates during driving, when the rear portion of the interior moves up-down, left-right, and front-back directions relative to the housing 14 with the recess 20d as a fulcrum, or when the interior moves in the front-back direction relative to the housing 14, the elastic body 32a elastically deforms, thereby being able to offset the vibration of the interior. In addition, since the large diameter portion 33b of the shaft 33 is engaged with the elastic body 32a, it is possible to more effectively reduce vibration, especially in the left-right direction. In addition, the rear extension 31 is provided at the rear of the motor housing 11b, and the motor unit 11 is supported via the elastic body 32a in the rear extension 31, so that the support structure around the motor can be made compact, and from the perspective of being able to ensure space, a soft elastic body can also be used.

[0066] In addition, the annular elastic body 32a and the housing of the electric motor 11a are half structures that can be divided into left and right. Therefore, when assembling the left and right housings, the elastic body 32a of the half structure on one side is pre-assembled in the housing in the state of the rear extension part 31, and the shaft 33 is inserted into the hole of the elastic body 32a, and then the elastic body 32a of the other half structure is assembled to the housing of the other side of the rear extension part 31. In this way, the elastic body 32a and the shaft 33 can be assembled to assemble the housing.

[0067] And, as a vibration reduction measure, Fig.13 and Fig.14 The working machine 10 of the second modified example shown in the figure also has a structure in which an elastic body is provided on the electric motor 11a side at the rear side. The engagement structure of the concave portion 20d and the convex portion 14d is similar to that of the first modified example ( Fig. 9In the working machine 10 of the second modified example, the motor unit 11 also has a rear extension portion 31 extending rearward from the rear end of the motor housing 11b, and an elastic body 32a is sandwiched between the rear extension portion 31 and the housing 14. Fig.15 and Fig.16 As shown in the figure, a semicircular elastic body 32b is embedded in the rear extension 31 of the motor unit 11. The semicircular elastic body 32b is held by a snap-fitting member 34, which snaps with the inner wall of the housing 14 and is supported by the housing 14. That is, the motor unit 11 is supported by the housing 14 via the semicircular elastic body 32b and the snap-fitting member 34. In addition, the above structure can also be realized by setting the elastic body 32b to a circular shape instead of a semicircular shape.

[0068] In the working machine 10 of the second modified example, the rear extension portion 31 is provided behind the motor portion 11, and the portion (the portion behind the motor portion 11) away from the vibration center of the drive portion 20 etc. can also be supported via the elastic body 32b. Thus, vibration reduction in the up-down, left-right, and front-back directions can be achieved.

[0069] And, as a vibration reduction measure, Fig.17 and Fig.18 The working machine 10 of the third modified example shown in the figure also has a structure in which an elastic body is provided on the rear side of the motor unit 11. The engagement structure of the recess 20d and the housing 14 is similar to that of the first modified example ( Fig. 9 ). In the working machine 10 of the third modified example, the motor unit 11 also has a rear extension portion 31 extending rearward from the rear end of the motor unit 11, and an elastic body 32c is sandwiched between the rear extension portion 31 and the housing 14. Fig.19 and Fig. 20 As shown in FIG. 1 , a circular elastic body 32c is embedded in the rear extension 31 of the motor unit 11. The circular elastic body 32c has a recess 32d, and the recess 32d of the elastic body 32c engages with a protrusion support portion 38 protruding from the inner wall of the housing 14, and is supported by the housing 14. That is, the motor unit 11 is supported by the housing 14 via the circular elastic body 32c and the protrusion support portion 38.

[0070] In the working machine 10 of the third modified example, the rear extension portion 31 is provided at the rear of the motor portion 11, and the portion (the portion at the rear side of the motor portion 11) away from the vibration center of the drive portion 20 etc. can also be supported via the elastic body 32c. Thus, vibration reduction in the up-down, left-right, and front-back directions can be achieved. In addition, since the protrusion support portion 38 engaged with the elastic body 32c is provided as a whole with the inner wall of the housing 14, the number of interposed components can be reduced.

[0071] The present invention is not limited to the above-mentioned embodiment, and various changes can be made without departing from the scope of the main purpose. For example, in the above-mentioned embodiment, as an elastic body, a U-shaped elastic member 22 in which the first elastic body 23 and the second elastic body 24 are integrated is cited for description, but the first elastic body 23 and the second elastic body 24 may be separate bodies. Moreover, the protrusion (first elastic part) 25 and the base (second elastic part) 26 may also be separate bodies. For example, the protrusion 25 and the base 26 may be set to different rubbers and arranged in a manner that the two overlap.

[0072] Furthermore, the U-shaped elastic member 22 may be assembled to the rear end of the housing of the electric motor 11 a instead of being assembled to the driving unit 20 .

[0073] Explanation of symbols

[0074] 10—operating machine, 11—motor part, 11a—electric motor, 12—device body, 13—battery pack, 14—housing (housing), 15—cover (housing, housing), 15a—front rib, 15b—side rib, 16—assembly part, 17—motor shaft, 18—main switch, 19—slide switch, 20—driving part (head), 20a—driving part housing, 20b—protrusion, 20c—convex edge, 21—controller, 22—U-shaped elastic member (elastic body), 23—first elastic body, 24—second elastic body, 25—protrusion (first elastic body), 25a— Internal protrusion, 26—base (second elastic part), 27—right elastic body, 28—left elastic body, 29—bracket, 30—output shaft, 31—rear extension, 32a, 32b, 32c—elastic body, 32d—recess, 33—shaft, 33a—small diameter part, 33b—large diameter part, 34—engaging part, 35—power transmission mechanism, 36—main shaft, 38—protrusion support part, 39—eccentric shaft, 40—ball bearing, 41—rocker arm, 42—first shaft, 46—second shaft, 52—front end tool, 55—tool fixing part, A1—first axis, B1—second axis.

Claims

1. A working machine, characterized in that: have: A driving unit including a motor portion and a driving portion disposed behind the motor portion and fixed to the motor portion; an output shaft supported by the driving portion and extending in the up-down direction; and a housing for housing the motor unit; The driving unit is supported by the housing in a state in which the driving portion is connected to the housing via an elastic body and the motor portion is not connected to the housing.

2. A working machine, characterized in that: have: a drive unit including a motor portion and a drive portion disposed behind the motor portion and fixed to the motor portion; an output shaft supported by the driving portion; and a housing for housing the motor unit; The driving unit is supported by the housing in a state where the driving portion is non-elastically connected to the housing and the motor portion is connected to the housing via the elastic body.

3. The working machine according to claim 1, characterized in that: The elastic body includes a first elastic body and a second elastic body which are arranged at different positions in a direction intersecting the left-right direction.

4. The working machine according to claim 3, characterized in that: The first elastic body and the second elastic body are arranged at different positions in the front-rear direction.

5. The working machine according to claim 3 or 4, characterized in that: Either one of the first elastic body and the second elastic body comprises: A first elastic part having a first elastic modulus, connected to any one of the housing and the driving part; and A second elastic portion having a second elastic modulus greater than the first elastic modulus is connected to the other of the housing and the driving portion.

6. The working machine according to claim 5, characterized in that: The second elastic portion is interposed between the housing and the driving portion in a vertical direction.

7. The working machine according to claim 5, characterized in that: The first elastic portion is located between the housing and the driving portion in a front-rear direction or a left-right direction.

8. The working machine according to claim 1, characterized in that: The elastic body is located between the driving portion and the housing in the front-rear direction.

9. The working machine according to claim 1, characterized in that: The elastic body includes a left elastic body arranged on the left side of the driving unit and a right elastic body arranged on the right side of the driving unit, and the left elastic body and the right elastic body are integrated.

10. The working machine according to claim 1, characterized in that: The elastic body is a U-shaped elastic member. The U-shaped elastic member includes portions respectively arranged on the left side, the right side, and the front side of the driving portion.

11. The working machine according to claim 2, characterized in that: The driving unit is directly connected to the housing, or is connected via a member having a greater rigidity than the elastic body. The elastic body is interposed between the motor unit and the housing.

12. The working machine according to claim 10, characterized in that: The motor portion has a rear extension portion extending rearward from the rear end of the motor portion. The elastic body is interposed between the rear extension portion and the housing.

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