Concrete vibrator

Abstract

The present invention provides a concrete vibrator with further vibration suppression. The concrete vibrator comprises: a motor (10); a flexible shaft (47) driven by the motor (10); an unbalanced member driven by the flexible shaft (47); a flexible hose (46) covering at least a portion of the unbalanced member and the flexible shaft (47); a main housing (2) housing the motor (10); and an elastic member (12) disposed between the main housing (2) and the flexible hose (46).

Description

Technical Field

[0001] This invention relates to concrete vibrators such as rechargeable concrete vibrators. Background Technology

[0002] Japanese Patent Application Publication No. 2020-120812 (Patent Document 1) discloses a concrete vibrator that is directly connected from a motor to the end of a flexible rotating shaft.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-120812 Summary of the Invention

[0006] For concrete vibrators, there is a desire for technologies that can further suppress vibration.

[0007] In addition, for concrete vibrators, there is a need for further technologies to suppress the current value of the motor.

[0008] This specification discloses a concrete vibrator. The concrete vibrator may include: a motor; a rotating shaft driven by the motor; and an eccentric component driven by the rotating shaft. It may also include a flexible hose covering at least a portion of the eccentric component and the rotating shaft. It may also include a housing for housing the motor. Furthermore, it may include an elastomer disposed between the housing and the flexible hose.

[0009] Invention Effects

[0010] According to the concrete vibrator described above, vibration is further suppressed.

[0011] In addition, based on the aforementioned concrete vibrator, the motor current value can be further suppressed. Attached Figure Description

[0012] Figure 1 This is a 3D view of a rechargeable concrete vibrator.

[0013] Figure 2 This is a central longitudinal section view of a rechargeable concrete vibrator.

[0014] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0015] Figure 4 This is a partial central cross-sectional view of a rechargeable concrete vibrator.

[0016] Figure 5 yes Figure 3A partial cross-sectional view of line A-A.

[0017] Figure 6 This is an exploded perspective view of the front of the motor housing, front cover, and rubber ring of a rechargeable concrete vibrator.

[0018] Figure 7 This is an exploded perspective view of the front of the motor housing, the retaining parts, and the rubber ring, viewed from the rear.

[0019] Figure 8A This is an exploded 3D view of the coupling of a rechargeable concrete vibrator from the front.

[0020] Figure 8B This is an exploded 3D view of the coupling from the rear.

[0021] Symbol Explanation

[0022] 1…Concrete vibrator; 2…Main body shell; 2LB, 2LD1, 2LD2…Recess; 10…Motor; 12…Elastic component; 12E…Protrusion; 12F…Front rib protrusion; 12G…Rear rib protrusion; 14…Vibrating part; 25…Rotating shaft; 40…Main shaft; 42…Coupling; 42A…Front hub; 42A2…Front hub claw; 42B…Component; 42B2…Front groove; 42B3…Rear groove; 42C…Rear hub; 42C2…Rear hub claw; 44…Unbalance component; 45…Hose retainer; 46…Flexible hose; 47…Flexible shaft. Detailed Implementation

[0023] The concrete vibrator of the present invention may include: a motor; a flexible shaft driven by the motor; and an unbalanced member driven by the flexible shaft. It may also include a flexible hose covering at least a portion of the unbalanced member and the flexible shaft. It may also include a main housing for housing the motor. It may also include an elastic member disposed between the main housing and the flexible hose.

[0024] In this case, the vibration is further suppressed by utilizing elastic components. Furthermore, the increase in motor drive power caused by vibration is suppressed, and the current value is further reduced.

[0025] In addition, the elastic member can be ring-shaped or split-ring-shaped. In these cases, the elastic member is easy to install.

[0026] In addition, a retaining member can be provided to hold the elastic member in place. In this case, the elastic member is easy to install.

[0027] Furthermore, the flexible hose can have a hose retainer. The retainer can be connected to the flexible hose via the hose retainer. The elastic component can contact the main housing. In this case, the elastic component and the flexible hose are easy to install.

[0028] Furthermore, the elastic member can contact the retainer on its outer surfaces (radial inner surface, front surface, and rear surface) other than the radially outer outer surface. In this case, the elastic member is firmly held, and vibration is further suppressed.

[0029] Furthermore, protrusions, front rib-like protrusions, and rear rib-like protrusions can be formed on the outer surface (inner surface, front surface, and rear surface) of the elastic component that contacts the retainer. In this case, the elastic component is more easily deformed, and vibration is further suppressed.

[0030] Furthermore, the elastic member can come into contact with the main body shell. Recesses 2LB, 2LD1, and 2LD2 can be formed on the surfaces of the main body shell 2 that contact the elastic member 12 (the curved surface of the semi-opening portion 2LA and the recesses 2LC1 and 2LC2). In this case, the elastic member 12 is more difficult to slide relative to the main body shell 2, is held more firmly, and vibration is further suppressed.

[0031] Furthermore, the concrete vibrator of the present invention may include: a motor; a coupling connected to the motor; and a flexible shaft driven by the coupling. It may also include an imbalance member driven by the flexible shaft. It may also include a flexible hose covering at least a portion of the imbalance member and the flexible shaft. It may also include a main housing for housing the motor. Additionally, the flexible hose may be movable relative to the main housing.

[0032] In this case, even if the rotating shaft is offset from the main shaft, the rotational force can still be transmitted using the coupling. In particular, when an elastic member is sandwiched between the main housing and the vibrating part (flexible hose), and the vibrating part (flexible hose) can move relative to the main housing 2, the rotational force can be transmitted more reliably to the vibrating part side.

[0033] Furthermore, the coupling can include: a component, and a front hub and a rear hub connected to the component. Additionally, there can be two front hubs and two rear hubs. Moreover, when the extension direction of the flexible shaft is set to the front-rear direction, the front hubs and rear hubs can be positioned at the front and rear of the component. Furthermore, the front hub and rear hub can each have a front hub claw and a rear hub claw, and the component can have front grooves and rear grooves for the front hub claws and rear hub claws to enter. In these cases, the coupling is easy to install.

[0034] In addition, a main shaft can be installed between the coupling and the flexible shaft. In this case, the coupling and the flexible shaft are easy to install.

[0035] Hereinafter, embodiments and variations thereof will be described with appropriate reference to the accompanying drawings.

[0036] This method relates to a concrete vibrator, which is an example of an electric work device and an example of a power tool.

[0037] The terms "front," "back," "up," "down," "left," and "right" in this method and the variation examples are determined for ease of explanation and may vary depending on the working conditions and the state of at least one of the components to be moved.

[0038] It should be noted that the present invention is not limited to this method and its variations.

[0039] Figure 1 This is a 3D view of a rechargeable concrete vibrator (hereinafter referred to as a "concrete vibrator"). Figure 2 This is a longitudinal section view of the central section of a concrete vibrator. Figure 3 yes Figure 2 A magnified view of a portion of the image. Figure 4 This is a partial central cross-sectional view of a concrete vibrator. Figure 5 yes Figure 3 A partial cross-sectional view of line A-A.

[0040] The concrete vibrator 1 has a main body shell 2 as its outer casing. The main body shell 2 is assembled from left and right resin split shells 2L and 2R from the right side using multiple screws 3. The main body shell 2 includes: a motor housing 4, a controller housing 5, a handle 6, and a battery holding part 7. A battery cover 8 is detachably mounted on the battery holding part 7.

[0041] The motor storage section 4 is a cylindrical shape that extends in the front-to-back direction and stores the motor 10.

[0042] It should be noted that the housing may be a component in which at least one of the motor housing 4, controller housing 5, grip 6, and battery holding 7 has been separated.

[0043] A retaining member 11 is assembled at the front end of the motor housing 4. The retaining member 11 is held in the motor housing 4 by means of an elastic member 12, which is an elastic body. The retaining member 11 holds the elastic member 12. The retaining member 11 is made of metal, for example, aluminum. It should be noted that various metals include alloys thereof.

[0044] Figure 6 This is an exploded perspective view of the front of the motor housing 4, the retaining member 11, and the elastic member 12. Figure 7This is an exploded perspective view of the front of the motor housing 4, the retaining member 11, and the elastic member 12 as seen from the rear.

[0045] The retainer 11 has: a cylindrical portion 11A; a front flange portion 11B and a rear flange portion 11C, which protrude radially outward from the cylindrical portion 11A respectively; an upper rear piece 11D1, which protrudes rearward from above the rear surface of the rear flange portion 11C; and a lower rear piece 11D2, which protrudes rearward from below the rear surface of the rear flange portion 11C.

[0046] The elastic member 12 includes a left-opening elastic member 12L and a right-opening elastic member 12R. The elastic member 12 is disposed between the front flange portion 11B and the rear flange portion 11C of the retainer 11.

[0047] The left-hand split elastic member 12L includes: a split elastic member body 12A; a front flange portion 12B and a rear flange portion 12C, which protrude radially outward from the split elastic member body 12A respectively; and an end wall 12D that connects the upper and lower ends of the front flange portion 12B and the rear flange portion 12C. A groove 12X is formed between the front flange portion 12B and the rear flange portion 12C. The groove 12X extends circumferentially and is recessed radially inward. A plurality of protrusions 12E are formed on the inner surface of the split elastic member body 12A, each protruding radially inward relative to an adjacent portion. Each protrusion 12E extends front to back. The protrusions 12E are arranged at equal intervals in the circumferential direction. A plurality of front rib-like protrusions 12F are provided on the front surface of the front flange portion 12B, each extending radially. Each front rib-like protrusion 12F protrudes forward relative to an adjacent portion. The circumferential position of the front rib-shaped protrusions 12F corresponds to that of the protrusion 12E. Each front rib-shaped protrusion 12F contacts the rear surface of the front flange portion 11B of the retainer 11. A plurality of rear rib-shaped protrusions 12G, each extending radially, are provided on the rear surface of the rear flange portion 12C. Each rear rib-shaped protrusion 12G protrudes rearward relative to its adjacent portion. The circumferential position of the rear rib-shaped protrusions 12G corresponds to that of the protrusion 12E. Each rear rib-shaped protrusion 12G contacts the front surface of the rear flange portion 11C of the retainer 11.

[0048] The right split elastic member 12R has a shape that is symmetrical to the left split elastic member 12L. The right split elastic member 12R includes: a split elastic member body 12A; a front flange portion 12B and a rear flange portion 12C, which protrude radially outward from the split elastic member body 12A respectively; and an end wall 12D that connects the upper and lower ends of the front flange portion 12B and the rear flange portion 12C. A groove 12X is formed between the front flange portion 12B and the rear flange portion 12C. The groove 12X extends circumferentially and is recessed radially inward. Multiple protrusions 12E are formed on the inner surface of the split elastic member body 12A, each protruding radially inward relative to adjacent portions. Each protrusion 12E extends front-rear. The protrusions 12E are arranged at equal intervals in the circumferential direction. Multiple front rib-like protrusions 12F, each extending radially, are provided on the front surface of the front flange portion 12B. Each front rib-shaped protrusion 12F protrudes forward relative to its adjacent portion. The circumferential position of the front rib-shaped protrusion 12F corresponds to that of protrusion 12E. Each front rib-shaped protrusion 12F contacts the rear surface of the front flange portion 11B of the retainer 11. A plurality of rear rib-shaped protrusions 12G, each extending radially, are provided on the rear surface of the rear flange portion 12C. Each rear rib-shaped protrusion 12G protrudes rearward relative to its adjacent portion. The circumferential position of the rear rib-shaped protrusion 12G corresponds to that of protrusion 12E. Each rear rib-shaped protrusion 12G contacts the front surface of the rear flange portion 11C of the retainer 11.

[0049] It should be noted that at least one of the protrusion 12E, the front rib protrusion 12F, and the rear rib protrusion 12G may be omitted. The number of at least one of the protrusions 12E, the front rib protrusion 12F, and the rear rib protrusion 12G may be increased or decreased; for example, each elastic member 12, or each of the left and right split elastic members 12L and 12R, may have one. The extending direction of the protrusions 12E, the front rib protrusion 12F, and the rear rib protrusion 12G may be a direction other than the aforementioned extending direction. The shape of at least one of the protrusions 12E, the front rib protrusion 12F, and the rear rib protrusion 12G may be a shape other than rib-shaped. The arrangement of at least one of the protrusions 12E, the front rib protrusion 12F, and the rear rib protrusion 12G may be an arrangement other than the aforementioned arrangement. The elastic member 12 may be a component obtained by integrating the left and right split elastic members 12L and 12R by omitting the end walls 12D. The elastic component 12 can be divided into more than 3 parts.

[0050] On the curved surface of the semi-opening 2LA of the front part of the split housing 2L, corresponding to the left half of the cylindrical opening at the front of the motor housing 4, there are multiple recesses 2LB that are recessed radially outward. Additionally, above the semi-opening 2LA, there is a recess 2LC1 that is recessed to the left relative to the joint surface between the split housing 2L and the split housing 2R above the semi-opening 2LA, and below the semi-opening 2LA, there is a recess 2LC2 that is recessed to the left relative to the joint surface between the split housing 2L and the split housing 2R below the semi-opening 2LA. Each recess 2LC1 and 2LC2 is recessed relative to the joint surface by the wall thickness of the end wall 12D of the left-hand split elastic member 12L. Multiple recesses 2LD1 that are recessed radially outward are formed in the recess 2LC1, and multiple recesses 2LD2 that are recessed radially outward are formed in the recess 2LC2. On the other hand, the semi-opening 2RA of the front part of the split housing 2R (see reference...) Figure 4 It is formed in the same manner as the semi-opening portion 2LA. It should be noted that at least one of the recesses 2LB, 2LD1, and 2LD2 may be omitted.

[0051] The semi-opening portion 2LA of the split housing 2L protrudes radially inward relative to the immediately following portion. The semi-opening portion 2LA is held by the front flange 12B and rear flange 12C of the left split elastic member 12L. The inner curved surface of the semi-opening portion 2LA contacts the protrusion 12E of the left split elastic member 12L. The semi-opening portion 2LA enters the groove 12X of the left split elastic member 12L. Similarly, the semi-opening portion 2RA of the split housing 2R similarly holds the right split elastic member 12R.

[0052] A vibrating part 14 is connected to the front end of the cylindrical part 11A.

[0053] Motor 10 is an internal rotor type brushless motor, which has an outer stator 15 and a rotor 16 disposed inside the stator 15. Motor 10 is housed in a position where the rotation shaft 25 provided on the rotor 16 extends in the front-rear direction. The stator 15 is supported between upper and lower support ribs 17, 17 that protrude from the inner surfaces of the left and right split housings 2L, 2R.

[0054] The rotating shaft 25 has, in sequence from the rear: a rear end portion 25A, a central portion 25B, a rear large diameter portion 25C, a front large diameter portion 25D, and a front end portion 25E.

[0055] The stator 15 includes a stator core 18 and insulators 19A and 19B arranged before and after the stator core 18. Multiple (six) coils 20 are wound around the stator core 18 via the insulators 19A and 19B. Each coil 20 is connected in triplicate on the rear insulator 19B. Three-phase power lines 22 are led out from connectors 21 fastened to the lower end of the insulators 19B with screws. The power lines 22 are wound around to the upper side of the controller 50 within the controller housing 5 and connected to the upper surface of the control circuit board 52. A sensor circuit board 23, equipped with a rotation detection element (not shown), is fastened to the rear surface of the insulators 19B with screws. A signal line 24 led out from the lower end of the sensor circuit board 23 is wound around to the upper side of the controller 50 and connected to the upper surface of the control circuit board 52. It should be noted that... Figure 2 and Figure 3 In order to show the wiring path, each wiring is represented by a simple double-dotted line.

[0056] The rotor 16 includes: a rotating shaft 25, a rotor core 26 disposed around it (central portion 25B), and a plurality (4) of permanent magnets 27 fixed to the rotor core 26. The rear end 25A of the rotating shaft 25 is rotatably supported by a bearing 29 on a rear bearing retainer 28 protruding from the inner surface of the split housings 2L, 2R. The front large diameter portion 25D of the rotating shaft 25 is rotatably supported by a bearing 31 on a front bearing retainer 30 protruding from the inner surface of the split housings 2L, 2R behind the retainer 11. The front bearing retainer 30 has an upper wall 30A extending in all directions and a lower wall 30B extending in all directions.

[0057] A fan 32 is fixed between the stator 15 and the bearing 31, and on the rotating shaft 25 (rear large diameter portion 25C). The fan 32 is surrounded by a box-shaped partition rib 33. A portion of the front wall 33A of the partition rib 33, extending vertically and horizontally, forms a front bearing retainer 30. The front ends of each support rib 17 are connected vertically to the rear wall 33B of the partition rib 33, which extends vertically and horizontally. The lower part of the partition rib 33 has a first lower front wall 33C and a second lower front wall 33D, extending horizontally and vertically respectively. The rear end of the first lower front wall 33C is positioned further rearward than the front wall 33A. The front end of the first lower front wall 33C is connected to the lower inner surface of the main body housing 2. The second lower front wall 33D is entirely located between the front wall 33A and the rear wall 33B in the front-rear direction, and is positioned below the first lower front wall 33C.

[0058] The partition rib 33 protrudes from the inner surface of the split housings 2L and 2R. An exhaust passage 35 connected to the fan 32 is formed inside the partition rib 33 and at a position lower than the fan 32. Multiple exhaust ports 36 are formed on the lower surface of the main housing 2, which is the downstream end of the exhaust passage 35.

[0059] The upper rear piece 11D1 of the retainer 11 is normally disposed above the upper wall 30A of the front bearing retainer 30, spaced apart from the upper wall 30A. The lower rear piece 11D2 of the retainer 11 is normally disposed below the lower wall 30B of the front bearing retainer 30, spaced apart from the lower wall 30B.

[0060] With the upper rear piece 11D1 and the lower rear piece 11D2 arranged like this, vibration transmission from the retainer 11 toward the front bearing retainer 30 is suppressed. Furthermore, even if the retainer 11 rotates relative to the main housing 2 due to external force, its rotation will stop because the upper rear piece 11D1 contacts the upper wall 30A of the front bearing retainer 30 and the lower rear piece 11D2 contacts the lower wall 30B of the front bearing retainer 30.

[0061] It should be noted that in retainer 11, at least one of the upper rear piece 11D1 and the lower rear piece 11D2 may be omitted.

[0062] The cylindrical portion 11A of the retainer 11 holds multiple (two) bearings 41 by means of a cylindrical bearing cage 37. The bearing cage 37 is made of metal, for example, iron. The retainer 11 is made of aluminum. When the bearings 41 are held directly, the bearings 41 may creep (slip) relative to the retainer 11 due to the heat generated during operation. However, in the concrete vibrator 1, since each bearing 41 is held by means of the bearing cage 37, the creep of each bearing 41 is suppressed. A spacer 38 is provided between the front and rear bearings 41. The front and rear bearings 41 and the spacer 38 are fixed to the bearing cage 37 by means of an open ring 39.

[0063] The main shaft 40 is supported by front and rear bearings 41, enabling it to rotate about its own central axis. The main shaft 40 has a front end 40A, a large diameter portion 40B, and a rear end 40C. The main shaft 40 is coaxially disposed in front of the rotating shaft 25 and connected to the rotating shaft 25 via a coupling 42. The front end 40A of the main shaft 40 protrudes forward from the cylindrical portion 11A. The large diameter portion 40B of the main shaft 40 is disposed radially inside the spacer 38 between the front and rear bearings 41.

[0064] Figure 8A This is an exploded perspective view of coupling 42 from the front. Figure 8B This is an exploded perspective view of coupling 42 from the rear.

[0065] The coupling 42 has: an iron front hub 42A, an elastomer (rubber) component 42B, and an iron rear hub 42C.

[0066] The front wheel hub 42A has a cylindrical front wheel hub body 42A1 and a pair of front wheel hub claws 42A2 protruding rearward from the rear of the front wheel hub body 42A1. The front wheel hub body 42A1 has a front bore 42A3. The front bore 42A3 allows the main shaft 40 (rear end 40C) to enter.

[0067] Component 42B has: a cylindrical component body 42B1; a pair of front grooves 42B2 extending from the front end of the component body 42B1 to the rear end edge and recessed radially inward relative to adjacent portions; and a pair of rear grooves 42B3 extending from the rear end of the component body 42B1 to the front end edge and recessed radially inward relative to adjacent portions. The front grooves 42B2 and rear grooves 42B3 are arranged alternately in the circumferential direction. The front grooves 42B2 and rear grooves 42B3 are located throughout the entire circumference of the component body 42B1.

[0068] The rear wheel hub 42C has: a cylindrical rear wheel hub body 42C1, and a pair of rear wheel hub claws 42C2 protruding forward from the front of the rear wheel hub body 42C1. The rear wheel hub body 42C1 has a rear bore 42C3. The rear bore 42C3 allows the rotating shaft 25 (front end 25E) to enter.

[0069] Each front wheel hub claw 42A2 enters the corresponding front groove 42B2. The front wheel hub 42A is connected to the component 42B.

[0070] Each rear wheel hub claw 42C2 enters the corresponding rear groove 42B3. The rear wheel hub 42C is connected to the component 42B.

[0071] It should be noted that: at least one of the front and rear pawls is formed in component 42B, and the groove is formed in at least one of the front hub 42A and the rear hub 42C.

[0072] The vibrating part 14 is assembled by screwing the cylindrical hose retainer 45 provided at the rear end into the cylindrical part 11A. The vibrating part 14 has: an outer flexible hose 46 and a flexible rotating shaft 47 provided inside it.

[0073] The flexible hose 46, as a flexible tube, has an axial rigidity of a specified degree or higher, and is flexible enough to bend. The flexible shaft 47, as a shaft, has an axial rigidity of a specific degree or higher, and is flexible enough to bend. It should be noted that at least one of the hose and the shaft may not be flexible.

[0074] An unbalanced member 44, serving as an eccentric component, is connected to the front end of the flexible rotating shaft 47. The unbalanced member 44 is a columnar component extending front to back and supported for rotation about a virtual axis of rotation in its front-back direction. The unbalanced member 44 has two recesses 44A, each recess being a portion of a curved surface recessed within a virtual cylinder centered on its axis of rotation. Due to the recesses 44A, the unbalanced member 44 becomes a non-rotationally symmetric shape centered on its axis of rotation, resulting in eccentricity. The weight balance of the unbalanced member 44 is biased due to the recesses 44A. It should be noted that there can be one or more recesses 44A. Furthermore, the shape of the unbalanced member 44 can be other shapes. Multiple unbalanced members 44 can be provided.

[0075] A cap 49 covers the front end of the flexible hose 46.

[0076] The rear end of the flexible rotating shaft 47 is coaxially connected to the front end of the main shaft 40 via a coupling sleeve 48.

[0077] The controller 50 is housed within the controller housing 5, extending rearward. The controller 50 includes a housing 51 and a control circuit board 52 housed within the housing 51. The housing 51 is made of a metal with high heat dissipation, such as aluminum, with an open upper surface. A microcomputer and multiple switching elements are mounted on the upper surface of the control circuit board 52. It should be noted that... Figure 2 In the diagram, controller 50 is shown on the right side, not the longitudinal central section.

[0078] The housing 51 is held in place by retaining ribs 53 protruding from the inner surfaces of the split outer shells 2L and 2R. A heat dissipation portion 54, consisting of multiple protrusions and recesses, is formed at the center of the lower surface of the housing 51. The retaining ribs 53 hold the periphery of the housing 51, except for the heat dissipation portion 54.

[0079] It should be noted that the controller 50 can be housed in the concrete vibrator 1 in any part other than the controller housing 5.

[0080] Multiple air inlets 55A and 55B are formed in front of the controller 50 and on the lower wall of the main housing 2. Each air inlet 55A is located on the rear side of the rear wall 33B of the partition rib 33. Each air inlet 55B is located behind each air inlet 55A and in front of the controller 50.

[0081] A lower guide wall 56 is provided behind the air inlet 55B and protruding from the inner surface of the split housings 2L and 2R, extending upward from the boss of the screw 3 of the battery holder 7. The upper end of the lower guide wall 56 is inclined forward relative to the lower part. The upper end of the lower guide wall 56 is positioned further rearward than each air inlet 55A. The upper end of the lower guide wall 56 is positioned further upward than the controller 50.

[0082] An upper guide wall 57 is provided above the lower guide wall 56 and protrudes from the inner surface of the split housings 2L and 2R. The upper guide wall 57 extends rearward from the rear wall 33B of the partition rib 33. The rear portion of the upper guide wall 57 runs along the lower surface of the main housing 2. The front end of the upper guide wall 57 is positioned above the lower guide wall 56 and faces the same direction as the upper end of the lower guide wall 56. Each air inlet 55A is disposed below the lower guide wall 56.

[0083] A Y-shaped air intake path 58 is formed above each air intake 55A and behind each air intake 55B via the lower guide wall 56 and the upper guide wall 57. That is, air drawn in from each air intake 55A moves rearward along the upper guide wall 57 and reaches the upper side of the lower guide wall 57. Conversely, air drawn in from each air intake 55B moves upward along the lower guide wall 57 and reaches the upper side of the lower guide wall 57. The air converging on the upper side of the lower guide wall 57 flows rearward through the space between the front end of the upper guide wall 57 and the upper end of the lower guide wall 56. Then, the air flows separately: air that passes through the controller 50 side and reaches the motor 10, and air that directly reaches the motor 10.

[0084] A display panel 59 is provided above the controller 50, behind the motor 10, and on the upper surface of the controller housing 5. The display panel 59 is electrically connected to the control circuit board 52 and displays the remaining capacity of the battery pack 90.

[0085] The grip section 6 has an upper grip 60 and a lower grip 61.

[0086] The upper grip 60 extends in the front-to-back direction. The front end of the upper grip 60 is connected to the motor storage section 4 from above.

[0087] The lower grip 61 extends vertically. The upper end of the lower grip 61 is connected to the rear end of the upper grip 60. The lower end of the lower grip 61 is connected from above to the battery holder 7.

[0088] The grip part 6 is connected in a ring with the motor storage part 4, the controller storage part 5 and the battery holding part 7.

[0089] Shoulder strap locking portions 62 are provided on the front and rear upper surfaces of the upper handle 60. Since the locking portions 62 are arranged in the front-to-back direction, the user can easily adjust the direction of the vibrating part 14 when working with the concrete vibrator 1 with the shoulder strap hanging on his shoulder.

[0090] A switch 65 is provided on the upper part of the lower grip 61. The switch 65 has a push rod 66 protruding forward. A switch lever 67 is provided in front of the push rod 66. When the switch lever 67 is pressed backward by the user, it pushes the push rod 66 in. The switch 65 is electrically connected to the control circuit board 52 via a wire 68. A cylindrical ferrite core 69 is provided around the wire 68.

[0091] A locking button 71 is provided on the upper side of the switch 65 and inside the upper grip 60. The locking button 71 prevents the switch lever 67 from being pressed in under normal conditions, but allows the switch lever 67 to be pressed in by pressing it inward in the left or right direction.

[0092] It should be explained that Figure 2 In the middle section, switch 65, push rod 66, switch lever 67 and locking button 71 are shown on the right side, not in the longitudinal central section.

[0093] A terminal block 83 is held in the battery holding section 7. The terminal block 83 is held in a position extending in the front-rear direction. The terminal block 83 has a plurality of terminal plates (not shown). The terminal block 83 is electrically connected to the control circuit board 52. It should be noted that... Figure 2 In the middle, terminal block 83 is shown on the right side, rather than the longitudinal central section.

[0094] A recessed battery portion 86 is formed in the battery holding section 7. The battery portion 86 is located behind the terminal block 83.

[0095] The battery pack 90 can be installed in the battery holding section 7 by pressing it in from the rear to the front. It should be noted that... Figure 2 In the image, the battery pack 90 is shown on the right side, not in the longitudinal central section.

[0096] A connecting portion 92 is disposed on the upper part of the battery pack 90. ​​The connecting portion 92 can be connected to the battery holding portion 7. The connecting portion 92 has a plurality of slits (not shown) and terminal fittings disposed in each slit. When the battery pack 90 is assembled toward the battery holding portion 7, the terminal fittings of the connecting portion 92 contact the terminal plate of the terminal block 83, thereby electrically connecting to the terminal block 83.

[0097] A hook button 95 is provided at the rear of the connecting part 92. The hook button 95 has an upward-facing hook portion 96 at its front end. The hook button 95 is forced towards the hook portion 96 at an upward-protruding position from the connecting part 92 by a coil spring (not shown). When the hook button 95 is assembled toward the battery holding part 7, it enters the battery recess 86.

[0098] When removing the battery pack 90, press the hook button 95 downwards. This releases the latch of the hook part 96 toward the battery recess 86, allowing it to slide directly backwards and be pulled out.

[0099] The battery cover 8 is box-shaped and capable of housing the battery pack 90. ​​The battery cover 8 can be mounted on the battery holding part 7 in a state that covers the battery pack 90.

[0100] The battery cover 8 has a front main cover 100 and a rear opening and closing cover 101 for opening and closing the rear of the main cover 100. Even without removing the battery cover 8 from the battery holding part 7, the battery pack 90 can be installed or removed by opening the opening and closing cover 101.

[0101] An example of the operation of a concrete vibrator 1 like this will be explained.

[0102] When using the concrete vibrator 1 for concrete pouring, the user assembles the vibrating unit 14 and inserts it into the concrete within the mold box. In this state, the user presses the switch lever 67. This activates the switch 65, supplying power from the battery pack 90 to the motor 10 via the controller 50, causing the rotor 16 to rotate. Specifically, the microcomputer on the control circuit board 52 determines the rotational position of the rotor 16 based on detection signals obtained from the sensor circuit board 23, causing the switching elements to switch on and off. This allows three-phase current to flow sequentially through each coil 20, causing the rotor 16 to rotate.

[0103] Accordingly, the rotating shaft 25 rotates, causing the main shaft 40 to rotate via the coupling 42. Then, the rotation of the main shaft 40 causes the flexible rotating shaft 47 of the vibrating part 14 to rotate. As a result, the unbalanced member 44 rotates, causing the vibrating part 14 to vibrate, and the vibrating vibrating part 14 causes the concrete to flow throughout the mold box.

[0104] Even if the spindle 40 deviates from the rotating shaft 25 (main body housing 2), the coupling 42 will still transmit the rotation of the rotating shaft 25 to the spindle 40.

[0105] More specifically, the deviation is categorized into: the deviation between the virtual central axis in the front-back direction of the rotation axis 25 and the virtual central axis in the front-back direction of the main axis 40, the skew angle (deviation related to tilt), the eccentricity (deviation in the vertical direction), and the shaft end clearance (deviation in the front-back direction). Sometimes, at least two of the deviations—skew angle, eccentricity, and shaft end clearance—may occur in combination.

[0106] The allowable deflection angle is achieved by tilting at least one of the front hub 42A and the rear hub 42C relative to the member 42B. One front hub pawl 42A2 is inserted deeper into the front groove 42B2 of the member 42B, while the other front hub pawl 42A2 is inserted shallower, allowing the front hub 42A to tilt relative to the member 42B while remaining connected to it. Similarly, one rear hub pawl 42C2 is inserted deeper into the rear groove 42B3 of the member 42B, while the other rear hub pawl 42C2 is inserted shallower, allowing the rear hub 42C to tilt relative to the member 42B while remaining connected to it.

[0107] Eccentricity is permitted by maintaining a connection between the front hub 42A and the rear hub 42C and tilting them in the same direction relative to the component 42B.

[0108] Axle end clearance is permitted by offset of at least one of the front hub 42A and the rear hub 42C relative to the rubber component 42B in the longitudinal direction. The front hub 42A can move longitudinally relative to component 42B while maintaining connection with component 42B by increasing or decreasing the amount of engagement of the two front hub claws 42A2 in the front groove 42B2. The rear hub 42C can move longitudinally relative to component 42B while maintaining connection with component 42B by increasing or decreasing the amount of engagement of the two rear hub claws 42C2 in the rear groove 42B3.

[0109] In addition, the transmission of vibration from the vibrating part 14 toward the motor 10 side is suppressed.

[0110] That is, the vibration transmitted from the vibrating part 14 (mainly the flexible hose 46) toward the retainer 11 is attenuated by the elastic member 12, and the transmission toward the main body shell 2 can be suppressed.

[0111] The elastic member 12 has protrusions 12E, front rib-like protrusions 12F, and rear rib-like protrusions 12G, thus providing a space surrounded by the adjacent protrusions 12E, front rib-like protrusions 12F, and rear rib-like protrusions 12G, and the retaining member 11. Accordingly, the deformable portion of the elastic member 12 generated during vibration damping can be located within this space. That is, this space provides room for the elastic member 12 to deform sufficiently. Therefore, the elastic member 12 further suppresses vibration.

[0112] In addition, the vibration transmitted from the vibrating part 14 (mainly the flexible rotating shaft 47) toward the main shaft 40 is suppressed by the coupling 42.

[0113] When the fan 32 rotates along with the rotating shaft 25, as Figure 2 As shown by the dashed arrows, air is drawn in from each of the air inlets 55A and 55B of the controller housing 5.

[0114] A portion of the air flows through the Y-shaped air intake 58 toward the controller 50. This air then contacts the heat dissipation portion 54 of the housing 51, promoting heat dissipation from the controller 50. Additionally, air passing through the controller 50 and air not passing through the controller 50 pass between the support ribs 17, 17, cooling the motor 10.

[0115] After the motor 10 is cooled, the air flows radially outward to the fan 32 and is discharged to the outside through the exhaust passage 35 from each exhaust port 36.

[0116] The battery holding section 7 is provided with a removable battery cover 8. Therefore, if the battery cover 8 is damaged, it can be removed for repair or replacement.

[0117] Furthermore, a battery pack larger than the battery pack 90 can be installed in the battery holding section 7. Accordingly, a battery cover matching the size of the larger battery pack can also be installed in the battery holding section 7, replacing the battery cover 8.

[0118] It should be noted that the embodiments and modifications of the present invention are not limited to those described above. For example, the embodiments and modifications of the present invention can be further modified as follows.

[0119] The shape of the elastomer can be frame-like, etc.

[0120] The cylinder can be inserted between the hose retainer 45 and the retainer 11.

[0121] The main axis 40 can be divided into multiple sections, arranged side by side and connected to each other. The main axis 40 can be omitted.

[0122] Coupling 42 can be any type of coupling other than those described above. For example, coupling 42 can have one component 42B and one hub. Alternatively, coupling 42 can have multiple components 42B and multiple hubs. The connection of coupling 42 can be any connection other than that utilizing hub claws and grooves.

[0123] The battery pack 90 is not limited to a structure in which it is slidably mounted to the battery holding part 7 from the rear. The battery pack 90 may also be slidably mounted to the battery holding part 7 from the front, or from one of the left or right sides, or it may be inserted and mounted from below.

[0124] The location of the battery retainer 7 is not limited to the lower part of the main body casing 2. The location of the battery retainer 7 can be the rear, upper, or side of the main body casing 2.

[0125] The size of the battery pack 90 and the battery cover 8 is not limited to two types; three or more types can also be used separately.

[0126] At least one of the functions, configurations, types, forms, quantities, and materials of various components or parts may be appropriately changed. For example, the material of the elastomer may be a material other than rubber. In addition, the power supply for the concrete vibrator 1 may be a commercial power supply (AC) instead of the battery pack 90 (DC), or the battery pack 90 may be used together with the commercial power supply (AC).

[0127] This invention is applicable not only to concrete vibrators, but also to mixers (electrically operated equipment) used for mixing coatings, etc.

Claims

1. A concrete vibrator, characterized in that, have: motor; A rotating shaft, which is driven by the motor; An eccentric component, which is driven by the rotating shaft; A flexible hose that covers at least a portion of the eccentric component and the rotating shaft; A housing that encloses the motor; An elastomer disposed between the housing and the hose; as well as A retainer that holds the elastomer; The elastomer contacts the retainer on its outer surface, excluding the radially outer outer surface. A protrusion is formed on the outer surface of the elastomer that contacts the retainer.

2. The concrete vibrator according to claim 1, characterized in that, The elastomer is ring-shaped.

3. The concrete vibrator according to claim 1, characterized in that, The hose has a hose retainer. The retainer is connected to the hose via the hose retainer. The elastomer is in contact with the outer shell.

4. The concrete vibrator according to any one of claims 1 to 3, characterized in that, The elastomer is in contact with the outer shell. One or more recesses are formed on the surface of the outer shell that contacts the elastomer.

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