Electric power unit

Abstract

The invention provides an electric power unit capable of suppressing vibration of electric components. An electric power unit (1) has an electric motor (20), a battery (4) for driving the electric motor (20), and a battery tray (3) for supporting the battery (4). The battery tray (3) is attached to the motor (20) via an elastic member (50). The electric power unit (1) is provided with swing direction restricting portions (60) (80) (90), a front protruding portion (202d), and a rear protruding portion (202e) that restrict the relative movement of the battery tray (3) and the motor (20) in at least one of the mounting direction of the elastic member (50) and the swing direction substantially perpendicular to the mounting direction.

Description

[0001] This application is a divisional application of the invention patent application with application date of December 26, 2019, application number 201980103261.7, and invention name “Electric power unit and working machine”. Technical Field

[0002] The present invention relates to an electric power unit mounted on a construction machine, a working machine or the like, and a working machine equipped with the electric power unit. Background Art

[0003] Conventionally, there are known construction machines and working machines that use an engine (internal combustion engine) as a driving source. For example, Patent Document 1 discloses a plate compactor (ground tamping machine) that uses an engine as a driving source.

[0004] In recent years, as awareness of global environmental protection increases, the electrification of driving sources in hybrid vehicles, electric vehicles, etc. has been rapidly developed. In addition, the electrification of driving sources in construction machinery including plate compactors (sand tampers), working machines, etc. is also desired.

[0005] On the other hand, if the driving source of the working machine is to be electrified, in order to install the electric motor as the driving source, the battery for driving the electric motor, the PDU (Power Drive Unit) and other electrical components on the working machine, it is necessary to design the mounting part of the electric motor and the electrical components according to the shape of each working machine. Therefore, if the driving source of the working machine is to be electrified, there is a problem of increased manufacturing cost.

[0006] Therefore, in order to suppress an increase in manufacturing cost, it has been studied to mount electric components on an electric motor and to mount an electric power unit in which the electric motor and the electric components are integrated on a working machine.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Utility Model Application Laid-Open No. 7-42367 Summary of the invention

[0010] Problems to be solved by the invention

[0011] However, if an electric power unit in which a motor and an electrical component are integrated is installed in a working machine, then in the electrical component, both the vibration caused by the drive of the motor and the vibration caused by the drive of the working machine are transmitted to the electrical component. In addition, if the vibration caused by the drive of the motor and the vibration caused by the drive of the working machine resonate, they become large vibrations and are transmitted to the electrical component. Therefore, due to these vibrations, the electrical component may have a malfunction.

[0012] The present invention provides an electric power unit for suppressing vibration of electric components.

[0013] Means for solving problems

[0014] The present invention provides an electric power unit having:

[0015] Rotating electrical machines;

[0016] an electrical component for driving the rotating electrical machine; and

[0017] An electrical component support member for supporting the electrical component, wherein

[0018] The electrical component support member is mounted on the rotating electrical machine via an elastic member, and

[0019] A restricting portion that restricts relative movement between the electric component support member and the rotating electric machine is provided in at least one of a mounting direction of the elastic member and a swinging direction substantially perpendicular to the mounting direction.

[0020] Effects of the Invention

[0021] According to the present invention, when vibration of a predetermined value or more is generated in at least one of the mounting direction and the swinging direction of the elastic member relative to the elastic force of the elastic member, the vibration can be limited by the limiting portion. Thus, the electric component can be prevented from vibrating with a large amplitude of a predetermined value or more in at least one of the mounting direction and the swinging direction of the elastic member, thereby suppressing the vibration of the electric component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective view of a soil compacting machine equipped with an electric power unit according to one embodiment of the present invention.

[0023] Figure 2 It is a perspective view of an electric power unit according to one embodiment of the present invention.

[0024] Figure 3 yes Figure 2 An exploded perspective view of the electric power unit.

[0025] Figure 4 yes Figure 2 A cross-sectional view of the main parts of the electric power unit.

[0026] Figure 5A Observed from above Figure 2 A perspective view of a tray support plate of an electric power unit.

[0027] Figure 5B Observed from below Figure 2A perspective view of a tray support plate of an electric power unit.

[0028] Figure 6 yes Figure 2 A sectional view of the main parts of the left end portion of the electric power unit.

[0029] Figure 7 yes Figure 2 A cross-sectional view of the main parts of the central part of the electric power unit in the left-right direction.

[0030] Figure 8 It is used to illustrate Figure 2 A perspective view of an electric power unit PDU mounted on a rotating electrical machine.

[0031] Fig. 9 yes Figure 2 A three-dimensional view of the upper mounting components and the lower mounting components of the PDU of the electric power unit.

[0032] Fig.10 yes Fig. 9 A cross-sectional view of the main parts around the swing direction limiting part (upper side).

[0033] Fig.11 yes Fig. 9 A cross-sectional view of the main parts around the swing direction limiting part (lower side).

[0034] Fig.12 yes Figure 2 A sectional view of the main parts of the right end portion of the electric power unit.

[0035] Description of Reference Numerals

[0036] 1 Electric power unit

[0037] 3Battery tray (electrical component support member)

[0038] 30 Pallet body (main body)

[0039] 31 Decorative cover (second exterior component)

[0040] 38b left end (convex part)

[0041] 38c right end (convex part)

[0042] 4Batteries (Electrical components)

[0043] 20 Electric motor (rotating motor)

[0044] 202a Battery tray mounting surface (electrical component support member mounting surface)

[0045] 202d front convex portion (restriction portion, installation direction restriction portion)

[0046] 202e rear convex part (restriction part, installation direction restriction part)

[0047] 202i upper side mounting parts (electrical component support member)

[0048] 202k Lower side mounting parts (electrical component support member)

[0049] 203 Motor cover (first exterior component)

[0050] 21PDU (electrical components)

[0051] 211b through hole

[0052] 212b through hole

[0053] 50 Elastic components

[0054] 60 Swing direction limiting portion (limiting portion)

[0055] 61 Motor side restriction portion (rotating electric machine side restriction portion)

[0056] 611 cylindrical part

[0057] 62 Battery tray side restriction (electrical component side restriction)

[0058] 621 convex part

[0059] 70 Elastic components

[0060] 80 Swing direction limiting part (limiting part)

[0061] 81 Motor side restriction portion (rotating motor side restriction portion)

[0062] 811 cylindrical part

[0063] 82PDU side restriction (electrical component side restriction)

[0064] 821 Swing limit bolt (convex part, convex member)

[0065] 90° swing direction limiting part (limiting part)

[0066] 91 Motor side restriction portion (rotating electric machine side restriction portion)

[0067] 911 cylindrical part

[0068] 92PDU side restriction (electrical component side restriction)

[0069] 921 swing limiting bolt (convex part, convex member)

[0070] 100 tamping machine (working machine). DETAILED DESCRIPTION

[0071] Hereinafter, an embodiment of an electric power unit according to the present invention will be described with reference to the drawings.

[0072] The electric power unit of the present invention can be widely mounted on various machines and devices. In the present invention, the machines and devices equipped with the electric power unit are not specifically limited. For example, the electric power unit can be mounted on a working machine. Examples of working machines include tamping machines, lawn mowers, tilling machines, snow blowers, etc.

[0073] In the present embodiment, the electric power unit 1 is mounted on a soil tamping machine 100. It should be noted that in the following description, front and rear, left and right, and top and bottom are described according to the direction observed from the operator of the soil tamping machine 100, and in the drawings, the front is represented as Fr, the rear is represented as Rr, the left side is represented as L, the right side is represented as R, the top is represented as U, and the bottom is represented as D.

[0074] <Tamping machine>

[0075] like Figure 1 As shown, the soil compacting machine 100 includes an electric power unit 1 , a working mechanism portion 101 , a power transmission mechanism portion 102 , a vibrating mechanism portion 103 , and a handle 104 .

[0076] The electric power unit 1 includes a power unit body 2, a battery tray 3 disposed on the upper portion of the power unit body 2, and a battery 4 mounted on the battery tray 3 as an energy source for driving the power unit body 2. Details of the structure of the electric power unit 1 will be described later.

[0077] The working mechanism part 101 is a part that mainly performs ground rolling. The working mechanism part 101 has a rolling plate 101a that contacts the ground and a base 101b disposed on the upper surface of the rolling plate 101a. The electric power unit 1 is mounted on the upper surface of the base 101b.

[0078] The power transmission mechanism 102 transmits the rotational power of the motor included in the power unit body 2 to the vibration generating mechanism 103 via a power transmission member (not shown) such as a belt or a chain.

[0079] The vibrating mechanism 103 has an eccentric load (not shown) connected to the power transmission mechanism 102 in a power-transmitting manner. The vibrating mechanism 103 rotates the eccentric load using the rotational power from the electric power unit 1 transmitted by the power transmission mechanism 102, thereby vibrating the rolling plate 101a of the working mechanism 101 up and down, generating a pressing force relative to the ground.

[0080] The handle 104 is configured in a rod shape that the operator can hold in a standing position, so that the operator can perform ground compaction work while holding the handle 104 to move the tamping machine 100 .

[0081] <Electric Power Unit>

[0082] (Overall structure)

[0083] like Figures 2 to 4 As shown, the electric power unit 1 includes: a power unit body 2; a battery tray 3 disposed on the upper portion of the power unit body 2; and a battery 4 mounted on the battery tray 3 as an energy source for driving the power unit body 2.

[0084] (Power unit body)

[0085] The power unit main body 2 includes an electric motor 20 and a PDU (Power Drive Unit) 21 .

[0086] The motor 20 is a driving source of the soil tamping machine 100 that generates a rotational force for driving the vibrating mechanism 103 via the power transmission mechanism 102. The motor 20 is mounted on the base plate 201 so that the rotation axis 20a is oriented in the left-right direction.

[0087] The motor 20 is provided with a base plate 201 for mounting the motor 20 on the base 101b of the working mechanism unit 101, and a support frame plate 202 for mounting the PDU 21 and the battery tray 3 on the motor 20. The base plate 201 extends over the lower surface of the motor 20. The support frame plate 202 has a battery tray mounting surface 202a extending within the range of the upper surface of the motor 20 and a PDU mounting surface 202b extending within the range of the front surface of the motor 20.

[0088] PDU21 is a device for controlling the distribution of electric power from the battery 4 to the motor 20 in the power unit body 2 and other electrical components of the power unit body 2. PDU21 is arranged in front of the motor 20. PDU21 has a plurality of connection parts, among which the first connection part 21a is connected to an input harness 23 for electrically connecting to the battery 4 and introducing the electric power from the battery 4 into the PDU21. A connection terminal 24 connected to the battery 4 is provided at the front end of the input harness 23. The second connection part 21b among the plurality of connection parts of PDU21 is connected to an output harness 25 for supplying the electric power introduced via the connection terminal 24 and the input harness 23 to the motor 20. The third connection part 21c among the plurality of connection parts of PDU21 is connected to a sensor harness 26 for electrically connecting to other electrical components such as sensors.

[0089] The outer periphery of the motor 20 and the PDU 21 is covered by a motor cover 203. The motor cover 203 includes a first motor cover 203a, a second motor cover 203b, and a third motor cover 203c. That is, the first motor cover 203a, the second motor cover 203b, and the third motor cover 203c constitute a housing covering the front, rear, left, and right sides of the power unit body 2. In the present embodiment, the first motor cover 203a covers the front surface, a portion of the right side surface, and a portion of the left side surface of the power unit body 2, the second motor cover 203b covers the left side surface of the power unit body 2 and the left side of the rear surface, and the third motor cover 203c covers the right side surface of the power unit body 2 and the right side of the rear surface. The second motor cover 203b has a gas inlet 203d opened for a cooling fan (not shown) disposed on the left side of the motor 20. The gas inlet 203d is covered by a fan cover 203e.

[0090] (Battery Tray)

[0091] The battery tray 3 is a component for placing the battery 4 and mounted on the power unit body 2. The battery tray 3 of this embodiment includes: a rectangular tray body 30 mounted on the battery tray mounting surface 202a of the support frame plate 202; and a rectangular frame-shaped decorative cover 31 mounted on the tray body 30 in a manner surrounding the outer periphery of the tray body 30.

[0092] A retaining claw 32 that protrudes upward and locks the battery 4 is provided at the rear end of the tray body 30. A buckle 33 that engages with the battery 4 is provided at the front end of the tray body 30. The buckle 33 includes a movable portion 331 that is rotatable relative to the tray body 30 and a rod portion 332 that is continuous with the front end of the movable portion 331 and is rotatable.

[0093] Guide support parts 36 extending in the front-rear direction and protruding upward are provided at the left and right ends of the tray body 30 . When the battery 4 is placed on the battery tray 3 , the battery 4 is guided to an appropriate position on the tray body 30 by the guide support parts 36 .

[0094] A plurality of loading members 37 made of an elastic body such as rubber or resin are provided on the upper surface of the tray body 30. In the present embodiment, the loading members 37 are provided at four locations, namely, the left front side, the right front side, the left rear side, and the right rear side of the upper surface of the tray body 30. The upper surface of the loading members 37 has a concave-convex shape. When the battery 4 is placed on the battery tray 3, the loading members 37 are elastically deformed by the load of the battery 4 and elastically support the battery 4.

[0095] A substantially rectangular flat plate-shaped tray support plate 38 extending substantially horizontally is provided on the lower surface of the tray body 30 .

[0096] like Figure 5A , Figure 5B as well as Figure 6 As shown, the tray support plate 38 has: a main surface 38a that contacts the lower surface of the tray body 30 and extends substantially horizontally; a left end portion 38b that bends downward from the left end of the main surface 38a and forms a substantially horizontal surface extending in the front-rear direction at a position lower than the main surface 38a; and a right end portion 38c that bends downward from the right end of the main surface 38a and forms a substantially horizontal surface extending in the front-rear direction at a position lower than the main surface 38a. Thus, the tray support plate 38 has a concave-convex surface, and thus the rigidity is improved.

[0097] A predetermined gap S is formed in the vertical direction between the left end portion 38b and the right end portion 38c of the tray support plate 38 and the lower surface of the tray body 30. The tray support plate 38 is attached to the battery tray mounting surface 202a of the support frame plate 202 via an elastic member 50 made of an elastic body such as rubber or resin. Thus, the battery tray 3 is attached to the motor 20 via the elastic member 50.

[0098] An input harness lead-out portion 31a is provided on the left side of the inner periphery of the decorative cover 31. The input harness lead-out portion 31a is formed in a manner partially recessed toward the outer periphery and is inserted through the input harness 23. The input harness lead-out portion 31a is arranged at a position close to the front side when viewed from the front, corresponding to the PDU 21. The input harness 23 and the connection terminal 24 stored inside the first motor cover 203a and the second motor cover 203b are led out from the input harness lead-out portion 31a to the upper side of the battery tray 3.

[0099] (Battery)

[0100] Back to Figure 2 to Figure 4 The battery 4 has a substantially rectangular parallelepiped shape and is detachably mounted on the battery tray 3 on the upper portion of the power unit body 2 .

[0101] The battery 4 is provided with a connection portion 41 for connecting the connection terminal 24 of the input harness 23 to a connector portion (not shown) in the battery 4. The connection portion 41 is provided on the left side surface 4a of the battery 4 so as to protrude to the left. The connection portion 41 has an opening portion 41a that opens in the forward direction. When the battery 4 is mounted on the battery tray 3, the connection terminal 24 of the input harness 23 is inserted into the opening portion 41a. Thus, the battery 4 is electrically connected to the PDU 21.

[0102] The battery 4 contains a plurality of substantially cylindrical battery cells 400 extending in the left-right direction in the front-back direction and the up-down direction. A locking groove 42 is provided at the lower portion of the rear surface 4b of the battery 4. An engaged portion 43 engaged with the buckle 33 on the tray body 30 is provided from the front surface 4c to the upper surface 4d of the battery 4. A handle 44 for carrying the battery 4 is provided on the upper surface 4d of the battery 4.

[0103] The front end of the holding claw portion 32 of the tray body 30 is locked in the locking groove portion 42. As a result, the rear end of the battery 4 is fixed to the holding claw portion 32 of the tray body 30. The rod portion 332 of the buckle 33 is engaged with the engaged portion 43. As a result, the front end of the battery 4 is fixed to the tray body 30 through the buckle 33. In this way, the battery 4 is fixed to the tray body 30.

[0104] (Battery tray installation)

[0105] Reference Figures 4 to 7 The mounting of the battery tray 3 to the battery tray mounting surface 202 a will be described.

[0106] The flat tray support plate 38 provided on the lower surface of the tray body 30 is opposed to the battery tray mounting surface 202a of the support frame plate 202 of the motor 20 in the vertical direction. A plurality of elastic members 50 are arranged between the flat tray support plate 38 provided on the lower surface of the tray body 30 and the battery tray mounting surface 202a of the support frame plate 202 of the motor 20. In the present embodiment, the elastic members 50 are arranged at a total of four locations, namely, the front side and the rear side of the left end portion 38b of the tray support plate 38 and the front side and the rear side of the right end portion 38c of the tray support plate 38.

[0107] The left end portion 38b and the right end portion 38c of the tray support plate 38 are provided with through holes 381 penetrating in the vertical direction at positions where the elastic member 50 is arranged (see Figure 5A as well as Figure 5B ). Similarly, on the battery tray mounting surface 202a, a through hole 202c penetrating in the up-down direction is provided at a position where the elastic member 50 is arranged.

[0108] The elastic member 50 has a generally cylindrical shape extending in the up-down direction, and its upper and lower ends are flange-shaped and have large diameters. The elastic member 50 is provided with an upper surface protrusion 51 protruding upward from the upper surface and a lower surface protrusion 52 protruding downward from the lower surface. The upper surface protrusion 51 and the lower surface protrusion 52 are cylindrical in shape with a smaller diameter than the upper surface and the lower surface of the elastic member 50, and a thread groove is formed on the outer circumferential surface.

[0109] In each elastic member 50, the upper surface protrusion 51 is inserted through the through hole 381 of the tray support plate 38 and protrudes upward from the tray support plate 38, and the lower surface protrusion 52 is inserted through the through hole 202c of the battery tray mounting surface 202a and protrudes downward from the battery tray mounting surface 202a. In addition, a fastening nut 53 is fastened to the upper surface protrusion 51 protruding upward from the tray support plate 38 and the lower surface protrusion 52 protruding downward from the battery tray mounting surface 202a. In this way, the battery tray 3 is mounted on the motor 20 via the elastic member 50. At this time, the elastic member 50 is mounted on the tray support plate 38 and the battery tray mounting surface 202a in the up-down direction.

[0110] As described above, the battery tray 3 is mounted on the motor 20 via the elastic member 50 mounted in the up-down direction. Therefore, the battery tray 3 can swing relative to the motor 20 in a substantially horizontal direction substantially perpendicular to the mounting direction of the elastic member 50, i.e., the up-down direction, by the elastic force of the elastic member 50. In addition, the battery tray 3 can also move relative to the motor 20 in the mounting direction of the elastic member 50, i.e., the up-down direction, by the elastic force of the elastic member 50. Thus, the vibration generated by the vibration mechanism 103, the motor 20, etc. is absorbed by the elastic member 50, so that the vibration generated by the vibration mechanism 103 and the motor 20 can be reduced from being transmitted to the battery tray 3.

[0111] Moreover, a swing direction limiting portion 60 is provided on the supporting frame plate 202 of the battery tray 3 and the motor 20 for limiting the relative movement of the battery tray 3 relative to the motor 20 in a swing direction approximately perpendicular to the installation direction of the elastic component 50, i.e., in a substantially horizontal direction approximately perpendicular to the installation direction of the elastic component 50, i.e., the up and down direction.

[0112] The swing direction restricting portion 60 includes a motor side restricting portion 61 provided on the battery tray mounting surface 202 a of the support frame plate 202 of the motor 20 and a battery tray side restricting portion 62 provided on the tray support plate 38 of the battery tray 3 .

[0113] The motor side restriction portion 61 has a cylindrical portion 611 formed in the substantially central portion of the battery tray mounting surface 202a in the front-rear direction and the left-right direction and extending in the vertical direction. The cylindrical portion 611 is a square cylindrical shape and has a front surface 611a and a rear surface 611b extending in the left-right direction, and a left side surface 611c and a right side surface 611d extending in the front-rear direction (see Figure 3 ). An elastic member 612 made of an elastic body such as rubber or resin is provided on the inner circumference of the cylindrical portion 611. The upper and lower ends of the elastic member 612 are flange-shaped, and the elastic member 612 covers the inner circumference, upper end surface, and lower end surface of the cylindrical portion 611.

[0114] The battery tray side restriction portion 62 has a convex portion 621 extending vertically downward from the tray support plate 38 at a position facing the cylindrical portion 611 of the motor side restriction portion 61. The convex portion 621 has a cylindrical shape extending vertically.

[0115] The battery tray 3 is mounted on the support frame plate 202 of the motor 20 in a state where the convex portion 621 of the battery tray side restriction portion 62 is inserted into the cylindrical portion 611 of the motor side restriction portion 61. The convex portion 621 of the battery tray side restriction portion 62 is inserted into the cylindrical portion 611 of the motor side restriction portion 61 with a predetermined distance between it and the elastic member 612 provided on the inner peripheral surface of the cylindrical portion 611 of the motor side restriction portion 61 in the front-back direction and the left-right direction. Specifically, the convex portion 621 of the battery tray side restriction portion 62 and the elastic member 612 provided on the inner peripheral surface of the cylindrical portion 611 of the motor side restriction portion 61 are separated by a distance L61 in the front direction, a distance L62 in the rear direction, a distance L63 in the left direction, and a distance L64 in the right direction. In the present embodiment, the distances L61, L62, L63, and L64 are equal to each other, for example, 5 mm.

[0116] The motor side restriction portion 61 and the battery tray side restriction portion 62 are engaged in a manner that allows them to move relative to each other by a predetermined distance in the front-to-back direction and the left-to-right direction. In the present embodiment, the convex portion 621 of the battery tray side restriction portion 62 can move relative to the elastic member 612 provided on the inner circumference of the cylindrical portion 611 of the motor side restriction portion 61 by a distance that is a relative movement distance L61 in the front direction, a relative movement distance L62 in the rear direction, a relative movement distance L63 in the left direction, and a relative movement distance L64 in the right direction. Furthermore, when the protrusion 621 of the battery tray side limiting portion 62 moves relative to the elastic member 612 on the inner circumferential surface of the cylindrical portion 611 of the motor side limiting portion 61 by a distance L61 in the forward direction, a distance L62 in the backward direction, a distance L63 in the left direction, and a distance L64 in the right direction, it abuts against the elastic member 612, limiting its relative movement to prevent relative movement exceeding the above distance.

[0117] Therefore, when vibrations exceeding a prescribed value are generated in the electric power unit 1 due to the elastic force of the elastic member 50, the battery tray 3 and the battery 4 swing in the horizontal direction, and the convex portion 621 of the battery tray side limiting portion 62 abuts against the elastic member 612 provided on the inner peripheral surface of the cylindrical portion 611 of the motor side limiting portion 61. Therefore, when vibrations exceeding a prescribed value are generated in the electric power unit 1 due to the elastic force of the elastic member 50, the battery tray 3 and the battery 4 are restricted from swinging with a large amplitude exceeding a prescribed value in the horizontal direction as the swinging direction. Thus, the swinging of the battery tray 3 and the battery 4 can be suppressed. Therefore, it is possible to suppress adverse conditions caused by the swinging of the battery 4 with an amplitude exceeding a prescribed value, and in addition, it is possible to prevent excessive stress from being applied to the elastic member 50.

[0118] At this time, the protrusion 621 of the battery tray side limiting portion 62 abuts against the elastic member 612, so that the elasticity of the elastic member 612 can reduce the noise caused by the abutment sound of the protrusion 621 of the battery tray side limiting portion 62, and can prevent excessive stress from being applied to the protrusion 621 of the battery tray side limiting portion 62 and the cylindrical portion 611 of the motor side limiting portion 61.

[0119] Furthermore, the motor side restriction portion 61 and the battery tray side restriction portion 62 are engaged in a manner that allows them to move relative to each other by a predetermined distance in the front-rear direction and the left-right direction, thereby causing the elastic member 50 to elastically deform in the swing direction for swings with an amplitude less than a predetermined value, thereby suppressing the swings of the battery tray 3 and the battery 4, and causing the convex portion 621 of the battery tray side restriction portion 62 to abut against the elastic member 612 provided on the inner peripheral surface of the cylindrical portion 611 of the motor side restriction portion 61 for swings with an amplitude greater than a predetermined value, thereby suppressing the swings of the battery tray 3 and the battery 4. As a result, the elastic member 50 and the swing direction restriction portion 60 can both bear the load generated by the swings of the battery tray 3 and the battery 4 in a dispersed manner, thereby suppressing the loss and degradation of the elastic member 50 and the swing direction restriction portion 60.

[0120] Furthermore, when the convex portion 621 of the battery tray side limiting portion 62 moves relative to the elastic member 612 provided on the inner peripheral surface of the cylindrical portion 611 of the motor side limiting portion 61 by a distance L61 in the forward direction, a distance L62 in the rearward direction, a distance L63 in the leftward direction, and a distance L64 in the rightward direction, the convex portion 621 of the battery tray side limiting portion 62 contacts the elastic member 612 and is restricted from relative movement, thereby restricting the battery tray 3 and the battery 4 from swinging with an amplitude greater than a prescribed value in two directions, namely, the front-back direction and the left-right direction, relative to the motor 20. Therefore, it is possible to further suppress the adverse conditions caused by the battery 4 swinging with an amplitude greater than a prescribed value, and further prevent the elastic member 50 from being subjected to excessive stress. In addition, since the distances L61, L62, L63, and L64 are respectively equal, it is possible to equally restrict the battery tray 3 and the battery 4 from swinging with an amplitude greater than a prescribed value in two directions, namely, the front-back direction and the left-right direction, relative to the motor 20. Therefore, it is possible to more effectively suppress the malfunction caused by the battery 4 oscillating with an amplitude equal to or greater than a predetermined value, and it is possible to more effectively prevent excessive stress from being applied to the elastic member 50 .

[0121] Furthermore, the swing direction limiting portion 60 can limit the battery tray 3 and the battery 4 from swinging with an amplitude greater than a specified value relative to the motor 20 through the cylindrical portion 611 of the motor side limiting portion 61 and the convex portion 621 of the battery tray side limiting portion 62. Therefore, the battery tray 3 and the battery 4 can be limited from swinging with an amplitude greater than a specified value relative to the motor 20 with a simple structure and a simple method.

[0122] In addition, the battery tray mounting surface 202a of the support frame plate 202 of the motor 20 is a concave-convex surface in the vertical direction. In this embodiment, it has: a front convex portion 202d extending in the left-right direction and protruding upward at a position forward of the motor side restriction portion 61 of the battery tray mounting surface 202a; and a rear convex portion 202e extending in the left-right direction and protruding upward at a position rearward of the motor side restriction portion 61 of the battery tray mounting surface 202a.

[0123] When the battery tray 3 and the battery 4 move relative to the motor 20 by more than a predetermined value in the installation direction of the elastic member 50, that is, in the vertical direction, the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a contact the tray support plate 38 of the battery tray 3. Therefore, the relative movement of the battery tray 3 and the battery 4 relative to the motor 20 in the vertical direction is restricted by the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a. That is, the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a restrict the relative movement of the battery tray 3 and the battery 4 relative to the motor 20 in the vertical direction by more than a predetermined value.

[0124] Thus, since the battery tray mounting surface 202a becomes a concave-convex surface, the rigidity of the battery tray mounting surface 202a is improved. In addition, the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a restrict the relative movement of the battery tray 3 and the battery 4 relative to the motor 20 by more than a predetermined value in the vertical direction. Therefore, when a load or vibration in the vertical direction is applied to the electric power unit 1, the elastic member 50 and the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a can both bear the load generated by the load or vibration in a distributed manner, thereby suppressing the loss and degradation of the elastic member 50.

[0125] In addition, the left end portion 38b and the right end portion 38c of the tray support plate 38 formed on the battery tray 3 are convex portions protruding downward from the main surface 38a of the tray support plate 38 and extending in the front-to-back direction, whereas the front convex portion 202d and the rear convex portion 202e protruding upward from the battery tray mounting surface 202a extend in the left-to-right direction. Therefore, the front convex portion 202d and the rear convex portion 202e protruding upward from the battery tray mounting surface 202a extend in a direction intersecting the extending direction of the left end portion 38b and the right end portion 38c of the tray support plate 38 formed on the battery tray 3.

[0126] Thus, when a load or vibration in the vertical direction is applied to the electric power unit 1, and the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a abut against the tray support plate 38 of the battery tray 3, even if excessive stress is applied to the tray support plate 38 of the battery tray 3 and the battery tray mounting surface 202a, since the tray support plate 38 and the battery tray mounting surface 202a are concave-convex surfaces and have high rigidity, deformation of the tray support plate 38 and the battery tray mounting surface 202a can be suppressed. In addition, the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a extend in a direction intersecting with the extending direction of the left end portion 38b and the right end portion 38c of the tray support plate 38, so that the stress applied to the tray support plate 38 of the battery tray 3 and the battery tray mounting surface 202a can be dispersed, and deformation of the tray support plate 38 and the battery tray mounting surface 202a can be further suppressed.

[0127] In this embodiment, an elastic member 202f made of an elastic body such as rubber or resin is provided on the upper surface of the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a. Therefore, when the battery tray 3 and the battery 4 move relative to the motor 20 in the up-down direction by a predetermined value or more, the tray support plate 38 of the battery tray 3 abuts against the elastic member 202f provided on the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a. Thus, the elasticity of the elastic member 202f can reduce the noise caused by the abutment sound of the tray support plate 38 of the battery tray 3.

[0128] The tray support plate 38 of the battery tray 3 and the elastic members 202f provided on the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a have a distance L65 in the vertical direction.

[0129] In addition, the tamping machine 100 equipped with the electric power unit 1 can not only reduce the transmission of vibrations generated by the drive of the motor 20 to the battery tray 3 through the elastic component 50, the swing direction limiting part 60, the front protrusion 202d and the rear protrusion 202e, but also reduce the transmission of vibrations generated by the drive of the vibration-generating mechanism part 103 of the tamping machine 100 and the vibrations in the up and down directions when the rolling plate 101a is subjected to excessive rebound to the battery tray 3.

[0130] (PDU)

[0131] like Figure 3 , Figure 4 as well as Figure 8 As shown, the PDU 21 has a substantially rectangular parallelepiped shape extending in the vertical direction, the horizontal direction, and the front-rear direction and being long in the vertical direction. The rear surface of the PDU 21 serves as a heat sink, and a plurality of fins protruding substantially horizontally toward the rear are formed.

[0132] An upper support portion 211 is provided at the upper end of the rear surface of PDU21 to support PDU21 and protrude rearward from the rear surface of PDU21 and extend substantially horizontally. A lower support portion 212 is provided at the lower end of the rear surface of PDU21 to support PDU21 and protrude rearward from the rear surface of PDU21 and extend substantially horizontally.

[0133] (PDU installation)

[0134] Reference Figure 4 and Figure 8 to Figure 11 The installation of the PDU 21 on the PDU installation surface 202b will be described.

[0135] like Figure 4and Figure 8 As shown, a PDU support plate 202g having a flat plate shape substantially perpendicular to the front-rear direction is fixed to the front surface of the PDU mounting surface 202b of the support frame plate 202 of the motor 20. An upper mounting component 202i is fixed to the upper portion of the PDU support plate 202g, and the upper mounting component 202i has an upper mounting portion 202h protruding forward from the front surface of the PDU support plate 202g and extending in the horizontal direction. A lower mounting component 202k is fixed to the lower portion of the PDU support plate 202g, and the lower mounting component 202k has a lower mounting portion 202j protruding forward from the front surface of the PDU support plate 202g and extending in the horizontal direction.

[0136] The upper support portion 211 of the PDU 21 and the upper mounting portion 202h of the PDU support plate 202g are opposed to each other in the vertical direction in such a manner that the upper support portion 211 of the PDU 21 is at the top and the upper mounting portion 202h of the PDU support plate 202g is at the bottom. The lower support portion 212 of the PDU 21 and the lower mounting portion 202j of the PDU support plate 202g are opposed to each other in the vertical direction in such a manner that the lower support portion 212 of the PDU 21 is at the bottom and the lower mounting portion 202j of the PDU support plate 202g is at the top.

[0137] A pair of elastic members 70 are disposed on the left and right ends between the upper support portion 211 of the PDU 21 and the upper mounting portion 202h of the PDU support plate 202g and between the lower support portion 212 of the PDU 21 and the lower mounting portion 202j of the PDU support plate 202g.

[0138] Furthermore, the upper support portion 211 of the PDU 21 is mounted on the upper mounting portion 202h of the PDU support plate 202g via the elastic member 70. Similarly, the lower support portion 212 of the PDU 21 is mounted on the lower mounting portion 202j of the PDU support plate 202g via the elastic member 70. In this way, the PDU 21 is mounted on the motor 20 via the elastic member 70. At this time, the elastic member 70 is mounted on the upper support portion 211 and the upper mounting portion 202h and the lower support portion 212 and the lower mounting portion 202j in the up-down direction, respectively.

[0139] In this way, the PDU 21 is mounted on the motor 20 via the elastic member 70 mounted in the up-down direction. Therefore, the PDU 21 can swing relative to the motor 20 in a substantially horizontal direction substantially perpendicular to the mounting direction of the elastic member 70, i.e., the up-down direction, by the elastic force of the elastic member 70. In addition, the PDU 21 can also move relative to the motor 20 in the mounting direction of the elastic member 70, i.e., the up-down direction, by the elastic force of the elastic member 70. Thus, the vibration generated by the vibration mechanism 103, the motor 20, etc. is absorbed by the elastic member 70, so that the vibration generated by the vibration mechanism 103 and the motor 20 can be reduced from being transmitted to the PDU 21.

[0140] Furthermore, a swing direction limiting portion 80 is provided on the upper support portion 211 of the PDU 21 and the upper mounting portion 202h of the PDU support plate 202g of the motor 20 to limit the relative movement of the PDU 21 with respect to the motor 20 in a swing direction substantially perpendicular to the mounting direction of the elastic member 70, i.e., in a substantially horizontal direction substantially perpendicular to the mounting direction of the elastic member 70, i.e., in the up-down direction. Similarly, a swing direction limiting portion 90 is provided on the lower support portion 212 of the PDU 21 and the lower mounting portion 202j of the PDU support plate 202g of the motor 20 to limit the relative movement of the PDU 21 with respect to the motor 20 in a swing direction substantially perpendicular to the mounting direction of the elastic member 70, i.e., in a substantially horizontal direction substantially perpendicular to the mounting direction of the elastic member 70, i.e., in the up-down direction.

[0141] like Figure 8 and Fig.10 As shown, the swing direction restricting portion 80 includes: a motor side restricting portion 81 provided on the upper mounting portion 202 h of the PDU support plate 202 g of the motor 20 ; and a PDU side restricting portion 82 provided on the upper support portion 211 of the PDU 21 .

[0142] The motor side restriction portion 81 has a cylindrical portion 811 extending in the vertical direction and formed at the substantially central portion of the upper mounting portion 202h in the left-right direction. The cylindrical portion 811 is a square cylindrical shape, and has a front surface 811a and a rear surface 811b extending in the left-right direction, and a left side surface 811c and a right side surface 811d extending in the front-back direction. An elastic member 812 made of an elastic body such as rubber or resin is provided on the inner peripheral surface of the cylindrical portion 811. The upper and lower ends of the elastic member 812 are flange-shaped, and the elastic member 812 covers the inner peripheral surface, the upper end surface, and the lower end surface of the cylindrical portion 811.

[0143] The PDU-side restricting portion 82 has a swing restricting bolt 821 inserted through the upper support portion 211 at a position facing the cylindrical portion 811 of the motor-side restricting portion 81. The swing restricting bolt 821 is attached to the upper support portion 211 from above toward the cylindrical portion 811 of the motor-side restricting portion 81 in the vertical direction.

[0144] The PDU 21 is mounted on the PDU support plate 202g of the motor 20 in a state where the swing limiting bolt 821 of the PDU side limiting part 82 is inserted into the cylindrical part 811 of the motor side limiting part 81. The swing limiting bolt 821 of the PDU side limiting part 82 is inserted into the cylindrical part 811 of the motor side limiting part 81 at a predetermined distance in the front-back direction and the left-right direction from the elastic member 812 provided on the inner peripheral surface of the cylindrical part 811 of the motor side limiting part 81. Specifically, the swing limiting bolt 821 of the PDU side limiting part 82 is separated from the elastic member 812 provided on the inner peripheral surface of the cylindrical part 811 of the motor side limiting part 81 by a distance L81 in the front direction, by a distance L82 in the rear direction, by a distance L83 in the left direction, and by a distance L84 in the right direction. In the present embodiment, the distances L81, L82, L83, and L84 are respectively equal, for example, 5 mm.

[0145] The motor-side restricting portion 81 and the PDU-side restricting portion 82 are engaged with each other in the front-back direction and the left-right direction so as to be able to move relative to each other by a predetermined distance. In the present embodiment, the swing restricting bolt 821 of the PDU-side restricting portion 82 can move relative to the elastic member 812 provided on the inner circumference of the cylindrical portion 811 of the motor-side restricting portion 81 by a distance that is L81 in the front direction, L82 in the rear direction, L83 in the left direction, and L84 in the right direction, relative to the elastic member 812 provided on the inner circumference of the cylindrical portion 811 of the motor-side restricting portion 81. Furthermore, when the swing limiting bolt 821 of the PDU side limiting part 82 moves relative to the elastic member 812 provided on the inner peripheral surface of the cylindrical part 811 of the motor side limiting part 81 by a distance L81 in the forward direction, a distance L82 in the rearward direction, a distance L83 in the leftward direction, and a distance L84 in the rightward direction, it contacts the elastic member 812, thereby limiting its relative movement to prevent relative movement by a distance greater than the above distance. Therefore, the distances L81, L82, L83, and L84 are the relative movable distances between the battery tray mounting surface 202a and the battery tray 3 in the forward direction, the rearward direction, the leftward direction, and the rightward direction, respectively.

[0146] like Figure 8 and Fig.11As shown, the swing direction restricting portion 90 includes: a motor side restricting portion 91 provided on the lower mounting portion 202 j of the PDU support plate 202 g of the motor 20 ; and a PDU side restricting portion 92 provided on the lower support portion 212 of the PDU 21 .

[0147] The motor side restriction portion 91 has a cylindrical portion 911 extending in the vertical direction and formed in the substantially central portion of the lower mounting portion 202j in the left-right direction. The cylindrical portion 911 is a square cylindrical shape, and has a front surface 911a and a rear surface 911b extending in the left-right direction, and a left side surface 911c and a right side surface 911d extending in the front-back direction. An elastic member 912 made of an elastic body such as rubber or resin is provided on the inner peripheral surface of the cylindrical portion 911. The upper and lower ends of the elastic member 912 are flange-shaped, and the elastic member 912 covers the inner peripheral surface, the upper end surface, and the lower end surface of the cylindrical portion 811.

[0148] The PDU-side restricting portion 92 has a swing restricting bolt 921 inserted through the lower support portion 212 at a position facing the cylindrical portion 911 of the motor-side restricting portion 91 below. The swing restricting bolt 921 is attached to the lower support portion 212 in the vertical direction from below toward the cylindrical portion 911 of the motor-side restricting portion 91.

[0149] The PDU 21 is mounted on the PDU support plate 202g of the motor 20 in a state where the swing limiting bolt 921 of the PDU side limiting part 92 is inserted into the cylindrical part 911 of the motor side limiting part 91. The swing limiting bolt 921 of the PDU side limiting part 92 is inserted into the cylindrical part 911 of the motor side limiting part 91 with a predetermined distance from the elastic member 912 provided on the inner peripheral surface of the cylindrical part 911 of the motor side limiting part 91 in the front-back direction and the left-right direction. Specifically, the swing limiting bolt 921 of the PDU side limiting part 92 is separated from the elastic member 912 provided on the inner peripheral surface of the cylindrical part 911 of the motor side limiting part 91 by a distance L91 in the front direction, by a distance L92 in the rear direction, by a distance L93 in the left direction, and by a distance L94 in the right direction. In the present embodiment, the distances L91, L92, L93, and L94 are respectively equal, for example, 5 mm.

[0150] The motor-side restricting portion 91 and the PDU-side restricting portion 92 are engaged with each other in the front-back direction and the left-right direction so as to be able to move relative to each other by a predetermined distance. In the present embodiment, the swing restricting bolt 921 of the PDU-side restricting portion 92 can move relative to the elastic member 912 provided on the inner circumference of the cylindrical portion 911 of the motor-side restricting portion 91 by a distance that is a relative movement distance L91 in the front direction, a relative movement distance L92 in the rear direction, a relative movement distance L93 in the left direction, and a relative movement distance L94 in the right direction. In addition, when the swing limiting bolt 921 of the PDU side limiting portion 92 moves relative to the elastic member 912 on the inner circumferential surface of the cylindrical portion 911 provided on the motor side limiting portion 91 a distance L91 in the forward direction, a distance L92 in the backward direction, a distance L93 in the left direction, and a distance L94 in the right direction, it abuts against the elastic member 912, thereby limiting its relative movement to prevent relative movement exceeding the above distance.

[0151] Therefore, when vibrations exceeding a prescribed value are generated in the electric power unit 1 due to the elastic force of the elastic member 70, the PDU 21 swings in the horizontal direction, and the swing limiting bolts 821, 921 of the PDU side limiting parts 82, 92 abut against the elastic members 812, 912 provided on the inner peripheral surface of the cylindrical parts 811, 911 of the motor side limiting parts 81, 91. Therefore, when vibrations exceeding a prescribed value are generated in the electric power unit 1 due to the elastic force of the elastic member 70, the PDU 21 is restricted from swinging with a large amplitude exceeding a prescribed value in the horizontal direction as the swinging direction. Thus, the swinging of the PDU 21 can be suppressed. Therefore, it is possible to suppress the adverse conditions caused by the swinging of the PDU 21 with an amplitude exceeding a prescribed value, and in addition, it is possible to prevent excessive stress from being applied to the elastic member 70.

[0152] At this time, the swing limiting bolts 821, 921 of the PDU side limiting parts 82, 92 abut against the elastic components 812, 912, so that the elasticity of the elastic components 812, 912 can reduce the noise caused by the abutment sound of the swing limiting bolts 821, 921 of the PDU side limiting parts 82, 92, and can prevent excessive stress from being applied to the swing limiting bolts 821, 921 of the PDU side limiting parts 82, 92 and the cylindrical parts 811, 911 of the motor side limiting parts 81, 91.

[0153] Furthermore, the motor-side restricting parts 81 and 91 are engaged with the PDU-side restricting parts 82 and 92 in the front-rear direction and the left-right direction so as to be relatively movable by a predetermined distance, whereby for swinging with an amplitude less than a predetermined value, the elastic member 70 is elastically deformed in the swinging direction, thereby suppressing the swinging of the PDU 21, and for swinging with an amplitude greater than a predetermined value, the swing restricting bolts 821 and 921 of the PDU-side restricting parts 82 and 92 abut against the elastic members 812 and 912 provided on the inner peripheral surface of the cylindrical parts 811 and 911 of the motor-side restricting parts 81 and 91, thereby suppressing the swinging of the PDU 21. Thus, the elastic member 70 and the swing direction restricting parts 80 and 90 can both bear the load generated by the swinging of the PDU 21 in a distributed manner, thereby suppressing the loss and degradation of the elastic member 70 and the swing direction restricting parts 80 and 90.

[0154] Furthermore, when the swing limiting bolts 821 and 921 of the PDU side limiting parts 82 and 92 move relative to the elastic members 812 and 912 provided on the inner peripheral surface of the cylindrical parts 811 and 911 of the motor side limiting parts 81 and 91 by the distances L81 and L91 in the forward direction, L82 and L92 in the rearward direction, L83 and L93 in the leftward direction, and L84 and L94 in the rightward direction, they contact with the elastic members 812 and 912 to limit the relative movement, thereby limiting the swing of the PDU 21 in the two directions of the front-back direction and the left-right direction with an amplitude greater than a predetermined value relative to the motor 20. Thus, it is possible to further suppress the adverse condition caused by the swing of the PDU 21 with an amplitude greater than a predetermined value, and further prevent the elastic member 70 from being subjected to excessive stress. Furthermore, the distances L81, L82, L83, L84 and the distances L91, L92, L93, L94 are equal to each other, so that the PDU 21 can be equally restricted from swinging with an amplitude greater than a predetermined value in two directions, namely, the front-rear direction and the left-right direction relative to the motor 20. Thus, it is possible to more effectively suppress the adverse conditions caused by the swing of the PDU 21 with an amplitude greater than a predetermined value, and it is possible to more effectively prevent excessive stress from being applied to the elastic member 70.

[0155] Furthermore, the swing direction restricting parts 80 and 90 can restrict the PDU 21 from swinging with an amplitude greater than a predetermined value relative to the motor 20 by means of the cylindrical parts 811 and 911 of the motor side restricting parts 81 and 91 and the swing restricting bolts 821 and 921 of the PDU side restricting parts 82 and 92. Therefore, the PDU 21 can be restricted from swinging with an amplitude greater than a predetermined value relative to the motor 20 by a simple structure and a simple method.

[0156] (PDU installation order)

[0157] Reference Figure 8 and Fig. 9 A procedure for attaching the PDU 21 to the PDU support plate 202g of the motor 20 will be described.

[0158] like Figure 8 (a) and Fig. 9 As shown, at the left and right ends of the upper mounting portion 202h of the PDU support plate 202g, through holes 202m penetrating in the up-down direction are provided at positions where the elastic member 70 is provided. At the left and right ends of the upper support portion 211 of the PDU21, notch portions 211a that are concave from the rear end to the front are provided at positions where the elastic member 70 is provided. Between a pair of notch portions 211a provided at the left and right ends of the upper support portion 211 of the PDU21, a through hole 211b penetrating in the up-down direction and for inserting the swing limiting bolt 821 of the PDU side limiting portion 82 is provided at approximately the center portion in the left-right direction of the upper support portion 211 of the PDU21. On the lower surface of the upper support portion 211 of the PDU21, a nut 211c (refer to Fig.10 ).

[0159] At the left and right ends of the lower mounting portion 202j of the PDU support plate 202g, through holes 202n penetrating in the up-down direction are provided at positions where the elastic member 70 is provided. At the left and right ends of the lower support portion 212 of the PDU21, notch portions 212a that are concave from the rear end to the front are provided at positions where the elastic member 70 is provided. Between a pair of notch portions 212a provided at the left and right ends of the lower support portion 212 of the PDU21, a through hole 212b penetrating in the up-down direction and for inserting the swing limiting bolt 921 of the PDU side limiting portion 92 is provided at approximately the center portion of the lower support portion 212 of the PDU21 in the left-right direction. On the upper surface of the lower support portion 212 of the PDU21, a nut 212c (refer to Fig.11 ).

[0160] The elastic member 70 has a generally cylindrical shape extending in the up-down direction, and the upper and lower ends are flange-shaped and have large diameters. The elastic member 70 is provided with an upper surface protrusion 71 protruding upward from the upper surface and a lower surface protrusion 72 protruding downward from the lower surface. The upper surface protrusion 71 and the lower surface protrusion 72 are cylindrical in shape with a smaller diameter than the upper surface and the lower surface of the elastic member 70, and a thread groove is formed on the outer circumferential surface.

[0161] First, if Figure 8As shown in (a), the elastic member 70 disposed between the upper support portion 211 of the PDU 21 and the upper mounting portion 202h of the PDU support plate 202g is disposed so that the lower surface protrusion 72 is inserted through the through hole 202m of the upper mounting portion 202h and protrudes below the upper mounting portion 202h. Then, the fastening nut 73 is fastened to the lower surface protrusion 72 protruding below the upper mounting portion 202h. Thus, the elastic member 70 is mounted on the upper mounting portion 202h.

[0162] Similarly, the elastic member 70 disposed between the lower support portion 212 of the PDU 21 and the lower mounting portion 202j of the PDU support plate 202g is disposed so that the upper surface protrusion 71 is inserted through the through hole 202n of the lower mounting portion 202j and protrudes above the lower mounting portion 202j. Then, the fastening nut 73 is fastened to the upper surface protrusion 71 protruding above the lower mounting portion 202j. Thus, the elastic member 70 is mounted on the lower mounting portion 202j.

[0163] Then, if Figure 8 As shown in (b), the PDU 21 is brought closer from the front in a state where the elastic member 70 is installed on the upper mounting portion 202h and the lower mounting portion 202j. At this time, the upper surface protrusion 71 of the elastic member 70 installed on the upper mounting portion 202h is inserted from the rear end of the notch 211a provided in the upper support portion 211 of the PDU 21. Similarly, the lower surface protrusion 72 of the elastic member 70 installed on the lower mounting portion 202j is inserted from the rear end of the notch 212a provided in the lower support portion 212 of the PDU 21.

[0164] Furthermore, in a state where the upper surface protrusion 71 of the elastic member 70 mounted on the upper mounting portion 202h is inserted through the notch 211a provided on the upper support portion 211 of the PDU 21 and the lower surface protrusion 72 of the elastic member 70 mounted on the lower mounting portion 202j is inserted through the cutout 212a provided on the lower support portion 212 of the PDU 21, the fastening nut 74 is fastened to the upper surface protrusion 71 of the elastic member 70 mounted on the upper mounting portion 202h, and the fastening nut 74 is fastened to the lower surface protrusion 72 of the elastic member 70 mounted on the lower mounting portion 202j. In this way, the PDU 21 is mounted on the motor 20 via the elastic member 70. At this time, the elastic member 70 is vertically mounted to the upper support portion 211 of the PDU 21 and the upper mounting portion 202h of the PDU support plate 202g, or the lower support portion 212 of the PDU 21 and the lower mounting portion 202j of the PDU support plate 202g.

[0165] Next, the swing limiting bolt 821 of the PDU side limiting part 82 is inserted into the through hole 211b from above the upper support part 211 of the PDU 21, and is fastened to the nut 211c. Thus, the swing limiting bolt 821 is inserted into the through hole 211b, extends in the up-down direction toward the cylindrical part 811 formed in the upper mounting part 202h, and is inserted into the cylindrical part 811. Similarly, the swing limiting bolt 921 of the PDU side limiting part 92 is inserted into the through hole 212b from below the lower support part 212 of the PDU 21, and is fastened to the nut 212c. Thus, the swing limiting bolt 921 is inserted into the through hole 212b, extends in the up-down direction toward the cylindrical part 911 formed in the lower mounting part 202j, and is inserted into the cylindrical part 911.

[0166] Therefore, the PDU side restriction part 82 has a swing restriction bolt 821, which can be mounted on the upper mounting part 202h of the PDU support plate 202g after the PDU 21 is mounted on the motor 20 via the elastic member 70. Similarly, the PDU side restriction part 92 has a swing restriction bolt 921, which can be mounted on the lower mounting part 202j of the PDU support plate 202g after the PDU 21 is mounted on the motor 20 via the elastic member 70.

[0167] Thus, the swing restricting bolt 821 of the PDU-side restricting portion 82 can be easily inserted into the cylindrical portion 811 of the motor-side restricting portion 81. Similarly, the swing restricting bolt 921 of the PDU-side restricting portion 92 can be easily inserted into the cylindrical portion 911 of the motor-side restricting portion 91.

[0168] In addition, the tamping machine 100 equipped with the electric power unit 1 can not only reduce the transmission of vibrations generated by the drive of the motor 20 to the PDU21 through the elastic component 70 and the swing direction limiting parts 80 and 90, but also reduce the transmission of vibrations generated by the drive of the vibration-generating mechanism part 103 of the tamping machine 100 and the up and down vibrations generated when the rolling plate 101a is subjected to excessive rebound to the PDU21.

[0169] (Positional relationship between battery tray and first motor cover)

[0170] Next, refer to Fig.12 The positional relationship between the battery tray 3 and the first motor cover 203a will be described.

[0171] like Fig.12 As shown, the tray body 30 of the battery tray 3 is arranged inside the first motor cover 203 a so as to partially overlap the first motor cover 203 a in the up-down direction for waterproofing and dustproofing.

[0172] In order to further prevent water, dust, etc. from entering the motor cover 203 (first motor cover 203a, second motor cover 203b, third motor cover 203c), the decorative cover 31 of the battery tray 3 is arranged on the outside of the first motor cover 203a so as to partially overlap with the first motor cover 203a in the vertical direction. In addition, the tray body 30 of the battery tray 3 is arranged at a distance D1 from the first motor cover 203a in the left-right direction. The decorative cover 31 of the battery tray 3 is arranged at a distance D2 from the first motor cover 203a in the left-right direction.

[0173] At this time, the distance D1 between the tray body 30 of the battery tray 3 and the first motor cover 203a is greater than the distance L64 that the battery tray 3 can move relative to the motor 20 in the right direction. The distance D2 between the decorative cover 31 of the battery tray 3 and the first motor cover 203a is greater than the distance L63 that the battery tray 3 can move relative to the motor 20 in the left direction.

[0174] Therefore, the tray body 30 and the decorative cover 31 of the battery tray 3 are arranged at a distance greater than the relative movable distance with respect to the motor 20 from the first motor cover 203 a in the left-right direction.

[0175] Although detailed description is omitted, similarly to the left-right direction, the tray body 30 and the decorative cover 31 of the battery tray 3 are also arranged at a distance greater than the relative movable distance with respect to the motor 20 in the front-rear direction.

[0176] Therefore, even if the battery tray 3 moves relative to the motor 20 in the front-to-back direction and the left-to-right direction, the tray body 30 and the decorative cover 31 of the battery tray 3 do not contact the first motor cover 203a, thereby preventing the tray body 30 and the decorative cover 31 of the battery tray 3 from being damaged or broken.

[0177] The tray body 30 of the battery tray 3 is disposed at a distance D3 from the first motor cover 203a in the vertical direction. The decorative cover 31 of the battery tray 3 is disposed at a distance D4 from the first motor cover 203a in the vertical direction.

[0178] At this time, the distance D3 between the tray body 30 of the battery tray 3 and the first motor cover 203a, and the distance D4 between the decorative cover 31 of the battery tray 3 and the first motor cover 203a are both the distance between the tray support plate 38 of the battery tray 3 and the elastic member 202f provided on the front convex portion 202d and the rear convex portion 202e of the battery tray mounting surface 202a, that is, the distance L65 (refer to Figure 6 , Figure 7 )above.

[0179] Therefore, even if the battery tray 3 moves relative to the motor 20 in the vertical direction, the tray body 30 and the decorative cover 31 of the battery tray 3 do not contact the first motor cover 203a, thereby preventing the tray body 30 and the decorative cover 31 of the battery tray 3 and the first motor cover 203a from being damaged or broken.

[0180] As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, and it can make deformation|transformation, improvement, etc. as needed.

[0181] For example, in this embodiment, the electric power unit 1 is mounted on the soil compacting machine 100, but it may be mounted on a construction machine or a working machine other than the soil compacting machine. In addition, the electric power unit 1 may be mounted on a machine or device other than the construction machine or the working machine.

[0182] In addition, for example, in the present embodiment, the electric power unit 1 includes the electric motor 20 , but the electric power unit is not limited to the electric motor, and may include a rotating electrical machine that generates electric power.

[0183] In addition, for example, in the present embodiment, the motor-side restriction portion 61 has a cylindrical portion 611 and the battery tray-side restriction portion 62 has a convex portion 621, but the motor-side restriction portion 61 may have a convex portion and the battery tray-side restriction portion 62 may have a cylindrical portion. Similarly, in the present embodiment, the motor-side restriction portions 81 and 91 have cylindrical portions 811 and 911 and the PDU-side restriction portions 82 and 92 have swing-limiting bolts 821 and 921, but the motor-side restriction portions 81 and 91 may have swing-limiting bolts and the PDU-side restriction portions 82 and 92 may have cylindrical portions.

[0184] For example, in the present embodiment, the PDU-side restricting portions 82 and 92 include the swing restricting bolts 821 and 921 , but are not limited to bolts, and may be convex members extending in the vertical direction such as swing restricting pins.

[0185] In addition, at least the following matters are described in this specification. It should be noted that, although corresponding components and the like in the above-mentioned embodiment are shown in brackets, the present invention is not limited thereto.

[0186] (1) An electric power unit (electric power unit 1), comprising:

[0187] Rotating electric machine (motor 20);

[0188] Electrical components (battery 4, PDU 21) for driving the rotating electrical machine; and

[0189] The electrical component support member (battery tray 3, upper mounting member 202i, lower mounting member 202k) supports the electrical components.

[0190] The electrical component support member is mounted on the rotating electrical machine via elastic members (elastic members 50, 70), wherein:

[0191] The electric power unit is provided with a limiting portion (swing direction limiting portion 60, 80, 90, front side protrusion 202d, rear side protrusion 202e) for limiting the relative movement of the electrical component supporting member and the rotating motor in at least one direction of the installation direction of the elastic member (up and down direction) and the swing direction (horizontal direction) approximately perpendicular to the installation direction.

[0192] According to (1), even when the electric power unit vibrates at a value greater than a specified value due to the elastic force of the elastic member, the relative movement of the electric component support member and the rotating motor can be limited by the limiting portion, thereby limiting the electric component support member and the electric component from swinging at a large amplitude greater than a specified value in at least one of the installation direction and the swing direction. Thus, the swinging of the electric component support member and the electric component can be suppressed. Therefore, the adverse conditions caused by the swinging of the electric component at an amplitude greater than a specified value can be suppressed, and in addition, excessive stress on the elastic member can be prevented.

[0193] (2) The electric power unit according to (1), wherein:

[0194] The restricting portion is a swing direction restricting portion (swing direction restricting portion 60, 80, 90) that restricts relative movement between the electric component support member and the rotating electrical machine in the swing direction.

[0195] The swing direction restriction portion includes a rotating electric machine side restriction portion (motor side restriction portion 61, 81, 91) provided on the rotating electric machine and an electric component side restriction portion (battery tray side restriction portion 62, PDU side restriction portion 82, 92) provided on the electric component support member.

[0196] The rotating electric machine side restriction portion and the electric component side restriction portion are engaged with each other so as to be relatively movable by a predetermined distance in the swing direction.

[0197] According to (2), the limiting part on the rotating motor side and the limiting part on the electric component side are engaged so as to be relatively movable by a predetermined distance in the swing direction, so that for swings with an amplitude less than a predetermined value, the elastic member can be elastically deformed in the swing direction to suppress the swing of the electric component support member and the electric component, and for swings with an amplitude greater than a predetermined value, the swing direction limiting part can suppress the swing of the electric component support member and the electric component. Thus, the elastic member and the swing direction limiting part can both bear the load generated by the swing of the electric component support member and the electric component in a distributed manner, so that the loss and degradation of the elastic member and the swing direction limiting part can be suppressed.

[0198] (3) The electric power unit according to (2), wherein:

[0199] The rotating electric machine side restriction portion and the electrical component side restriction portion are engaged in a manner capable of relative movement by a predetermined distance in a first swing direction (front-rear direction) perpendicular to the mounting direction and in a second swing direction (left-right direction) perpendicular to both the mounting direction and the first swing direction.

[0200] The relative movable distance in the first swing direction is equal to the relative movable distance in the second swing direction.

[0201] According to (3), the rotating electrical machine side restriction portion and the electric component side restriction portion are engaged in a manner capable of relative movement by a predetermined distance in two directions, namely the first swing direction and the second swing direction, so that the electric component support member and the electric component can be restricted from swinging with an amplitude greater than a predetermined value in two directions, namely the first swing direction and the second swing direction. Thus, it is possible to further suppress the adverse conditions caused by the swinging of the electric component with an amplitude greater than a predetermined value, and further prevent the application of excessive stress to the elastic member.

[0202] Furthermore, since the relative movable distance in the first swing direction is equal to the relative movable distance in the second swing direction, the swinging of the electric component support member and the electric component with an amplitude greater than a predetermined value in both the first swing direction and the second swing direction can be equally restricted. Thus, it is possible to more effectively suppress the adverse conditions caused by the swinging of the electric component with an amplitude greater than a predetermined value, and it is possible to more effectively prevent excessive stress from being applied to the elastic member.

[0203] (4) The electric power unit according to (2) or (3), wherein:

[0204] The rotating electrical machine side restriction portion and the electrical component side restriction portion are provided with a cylindrical portion (cylindrical portion 611, 811, 911) extending in the mounting direction on one side, and a convex portion (convex portion 621, swing restriction bolt 821, 921) extending toward the cylindrical portion in the mounting direction on the other side.

[0205] The electrical component support member is attached to the rotating electrical machine in a state in which the protrusion is inserted into the cylindrical portion.

[0206] According to (4), the swing direction limiting portion can limit the swing of the electric component support member and the electric component with an amplitude greater than a specified value by means of the cylindrical portion provided on one of the rotating motor side limiting portion and the electric component side limiting portion and the convex portion provided on the other side. Therefore, the swing of the electric component support member and the electric component with an amplitude greater than a specified value can be limited by a simple structure and a simple method.

[0207] (5) The electric power unit according to (4), wherein:

[0208] The other of the rotating electrical machine side restriction portion and the electrical component side restriction portion has a through hole (through hole 211b, 212b) penetrating in the mounting direction, and a convex member (swing restriction bolt 821, 921) inserted into the through hole and extending toward the cylindrical portion in the mounting direction,

[0209] The convex portion is formed by the convex member.

[0210] According to (5), the convex portion is formed by the convex member inserted into the through hole, so after the electric component support member is mounted on the rotating electrical machine, the convex portion can be formed by inserting the convex member into the through hole. Thus, the convex portion can be easily inserted into the cylindrical portion.

[0211] (6) The electric power unit according to any one of (2) to (5), wherein:

[0212] The outer periphery of the rotating electrical machine is covered by a first exterior member (motor cover 203).

[0213] The electric component support member includes a main body (tray body 30) and a second exterior member (decorative cover 31) surrounding the outer periphery of the main body.

[0214] At least one of the first exterior member and the second exterior member, and the first exterior member and the main body is disposed at a distance greater than a relative movable distance between the rotating electrical machine and the electrical component support member in the swing direction.

[0215] According to (6), at least one of the first exterior component and the second exterior component, and the first exterior component and the main body is arranged to be spaced apart from the relative movable distance between the rotating motor and the electric component support member in the swing direction, so that even if the electric component support member and the electric component move relative to the rotating motor in the swing direction, the first exterior component and the second exterior component, and the first exterior component and the main body will not contact each other. Thus, the first exterior component, the second exterior component, and the main body can be prevented from being damaged or broken.

[0216] (7) The electric power unit according to (1), wherein:

[0217] The restricting portion is an installation direction restricting portion (front convex portion 202d, rear convex portion 202e) that restricts relative movement between the electrical component support member and the rotating electrical machine in the installation direction.

[0218] The mounting direction restricting portion is a convex portion provided on at least one of the electric component support member and the rotating electrical machine and protruding in the mounting direction.

[0219] According to (7), the relative movement of the electrical component support member and the electrical component in the mounting direction can be limited to a value greater than a predetermined value by the mounting direction limiting portion. Thus, when a load or vibration in the mounting direction is applied to the electrical component, the elastic member and the mounting direction limiting portion can bear the load generated by the load or vibration in a distributed manner, thereby suppressing the loss and degradation of the elastic member.

[0220] (8) The electric power unit according to (7), wherein:

[0221] The rotating electrical machine has an electrical component support member mounting surface (battery tray mounting surface 202a) on which the electrical component support member is mounted.

[0222] The electrical component support member is formed with a convex portion (left end portion 38b, right end portion 38c) that protrudes toward the electrical component support member mounting surface in the mounting direction and extends in a first direction (front-rear direction) perpendicular to the mounting direction.

[0223] The mounting direction restricting portion is a convex portion formed on the mounting surface of the electrical component support member, protruding toward the electrical component support member in the mounting direction, and extending in a second direction (left-right direction) intersecting the first direction and perpendicular to the mounting direction.

[0224] According to (8), when a load or vibration in the installation direction is applied to the electric power unit, the installation direction limiting portion formed on the installation surface of the electric component support member abuts against the convex portion formed on the electric component support member, even when excessive stress is applied to the electric component support member and the installation surface of the electric component support member, the electric component support member and the installation surface of the electric component support member become concave-convex surfaces, so the rigidity is high, and the deformation of the electric component support member and the installation surface of the electric component support member can be suppressed. In addition, the installation direction limiting portion formed on the installation surface of the electric component support member extends in a second direction that intersects with the first direction that is the extension direction of the convex portion formed on the electric component support member, so that the stress applied to the electric component support member and the installation surface of the electric component support member can be dispersed, and the deformation of the electric component support member and the installation surface of the electric component support member can be further suppressed.

[0225] (9) The electric power unit according to (7) or (8), wherein:

[0226] The outer periphery of the rotating electrical machine is covered by a first exterior member (motor cover 203).

[0227] The electric component support member includes a main body (tray body 30) and a second exterior member (decorative cover 31) surrounding the outer periphery of the main body.

[0228] At least one of the first exterior member and the second exterior member, and the first exterior member and the main body is arranged at a distance greater than a relative movable distance between the rotating electrical machine and the electrical component support member in the mounting direction.

[0229] According to (9), at least one of the first exterior component and the second exterior component, and the first exterior component and the main body is arranged to be spaced apart from the rotating motor and the electric component support member by a distance greater than the relative movable distance in the installation direction, so that even if the electric component support member and the electric component move relative to the rotating motor in the installation direction, the first exterior component and the second exterior component, and the first exterior component and the main body will not contact each other. Thus, the first exterior component, the second exterior component, and the main body can be prevented from being damaged or broken.

[0230] (10) A working machine (ground tamping machine 100) comprising the electric power unit described in any one of (1) to (9)

[0231] According to (10), through the elastic component and the swing direction limiting part, not only the vibration generated by the drive of the rotating motor of the electric power unit can be reduced from being transmitted to the electrical component support component and the electrical components, but also the vibration generated by the drive of the working machine can be reduced from being transmitted to the electrical component support component and the electrical components.

Claims

1. An electric power unit, comprising: Rotating electrical machines; an electric component for driving the rotating electrical machine; and an electric component support member that supports the electric component, The electrical component support member is mounted on the rotating electrical machine via an elastic member. in, The electrical components are arranged in a direction perpendicular to the rotation axis of the rotating electrical machine. The electric power unit is provided with a restriction portion that restricts relative movement of the electric component support member and the rotating electric machine in a swing direction that is substantially perpendicular to the mounting direction of the elastic member.

2. The electric power unit according to claim 1, wherein: The electrical components include: a battery, which serves as an energy source for driving the electric power unit; and a PDU that controls distribution of power from the battery to the rotating electric machine, The electric power unit has a battery tray mounting surface extending within the range of the upper surface of the rotating electric machine, and a PDU mounting surface extending within the range of the front surface of the rotating electric machine, The battery is fixed to the battery tray installation surface via an elastic member, and the PDU is fixed to the PDU installation surface via an elastic member.

3. The electric power unit according to claim 2, wherein: A base plate is provided on the lower side of the rotating electrical machine, The elastic member interposed between the battery and the battery tray mounting surface and the elastic member interposed between the PDU and the PDU mounting surface are mounted in an up-and-down direction.

4. The electric power unit according to claim 2, wherein: The elastic member and the PDU interposed between the battery and the battery tray mounting surface overlap in the front-rear direction.

5. The electric power unit according to claim 2, wherein: The electrical component support member includes a main body that supports the battery and covers the upper sides of the rotating electrical machine and the PDU. The restricting portion is a mounting direction restricting portion that restricts relative movement of the electric component support member and the rotating electrical machine in the mounting direction. The mounting direction restricting portion is a convex portion provided on at least one of the electrical component support member and the rotating electrical machine and protruding in the mounting direction. A vertical distance between the mounting direction restricting portion and a side of the electrical component support member and the rotating electrical machine where the mounting direction restricting portion is not provided is shorter than a vertical distance between the PDU and the main body.

6. The electric power unit according to claim 1, wherein: The elastic member has a column shape extending in the up-down direction and is provided with an upper surface protrusion protruding upward from the upper surface and a lower surface protrusion protruding downward from the lower surface. The upper surface protrusion is fixed to the electrical component supporting member, The lower surface protrusion is fixed to the rotating electric machine.

7. The electric power unit according to claim 1, wherein: The restricting portion is a swing direction restricting portion that restricts relative movement of the electric component support member and the rotating electrical machine in the swing direction. The swing direction restricting portion includes a rotating electric machine side restricting portion provided on the rotating electric machine and an electric component side restricting portion provided on the electric component supporting member. The rotating electrical machine side restriction portion and the electrical component side restriction portion are relatively movable by a predetermined distance in the swing direction. The rotating electrical machine side restriction portion and the electrical component side restriction portion are provided with a cylindrical portion extending in the mounting direction on one side and a convex portion extending in the mounting direction toward the cylindrical portion on the other side. The electric component support member is mounted on the rotating electric machine in a state where the protrusion is inserted into the cylindrical portion. The other of the rotating electrical machine side restriction portion and the electrical component side restriction portion has a through hole penetrating in the mounting direction, and a convex member inserted into the through hole and extending toward the cylindrical portion in the mounting direction. The convex portion is formed by the convex member.

8. The electric power unit of claim 1, wherein: The outer periphery of the rotating electrical machine is covered by a first exterior member, The electrical component support member includes a main body and a second exterior member surrounding the outer periphery of the main body. At least one of the first exterior member and the second exterior member, and the first exterior member and the main body is disposed at a distance greater than a relative movable distance between the rotating electrical machine and the electrical component support member in the swing direction.

9. The electric power unit according to claim 5, wherein: The rotating electrical machine has an electric component support member mounting surface on which the electric component support member is mounted. The electrical component support member is formed with a convex portion that protrudes toward the electrical component support member mounting surface in the mounting direction and extends in a first direction perpendicular to the mounting direction. The mounting direction restricting portion is a convex portion formed on the mounting surface of the electric component support member, protruding toward the electric component support member in the mounting direction, and extending in a second direction intersecting the first direction and perpendicular to the mounting direction.

10. An electric power unit according to claim 5 or 9, wherein: The outer periphery of the rotating electrical machine is covered by a first exterior member, The electrical component support member includes a main body and a second exterior member surrounding the outer periphery of the main body. At least one of the first exterior member and the second exterior member, and the first exterior member and the main body is arranged at a distance greater than a relative movable distance between the rotating electrical machine and the electrical component support member in the mounting direction.

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