Work machine

Abstract

To disclose a technique that allows a plurality of kinds of power supply devices having different housing shapes to be used in a working machine.SOLUTION: A working machine can be operated by using electric power supplied from a first power supply device or a second power supply device, and is used in contact with the ground. The first power supply device and the second power supply device each comprise a battery cell, a housing storing the battery cell, a power cord extending from the housing, and for discharging electric power, and a connector arranged at an end part of the power cord. The housing of the first power supply device and the housing of the second power supply device have shapes different from each other. The working machine comprises a power supply device attachment part to which one of the first power supply device and the second power supply device can be selectively attached, and a connector connection part to which the connector is connected.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed in this specification relates to a working machine.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2013-000029 discloses a working machine. The working machine can operate using electric power supplied from a battery pack and is used in a state of being grounded to the ground. The working machine includes a battery pack attachment portion to which the battery pack can be attached.

Summary of the Invention

[0003] When increasing the working time of the working machine of Japanese Patent Application Laid-Open No. 2013-000029, instead of the battery pack, a power supply device having a rated capacity larger than the rated capacity of the battery pack is used. There are various types of power supply devices with different housing shapes. This specification discloses a technology that can use a plurality of types of power supply devices with different housing shapes for the working machine.

Means for Solving the Problems

[0004] This specification discloses a working machine. The working machine can operate using electric power supplied from a first power supply device or a second power supply device and is used in a state of being grounded to the ground. The first power supply device and the second power supply device each include a battery cell, a housing that houses the battery cell, a power cord that extends from the housing and discharges electric power, and a connector disposed at an end of the power cord. The housing of the first power supply device and the housing of the second power supply device have different shapes from each other. The working machine includes a power supply device attachment portion that can selectively attach either the first power supply device or the second power supply device, and a connector connection portion to which the connector is connected.

[0005] In the above configuration, the work machine can be used by attaching the first power supply device to the power supply device mounting portion, or the work machine can also be used by attaching a second power supply device having a housing shape different from that of the first power supply device to the power supply device mounting portion. As a result, a plurality of types of power supply devices having different housing shapes can be used for the work machine.

Brief Description of the Drawings

[0006]

Figure 1

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Figure 17

Mode for Carrying Out the Invention

[0007] Representative and non-limiting specific examples of the present invention will be described in detail below with reference to the drawings. This detailed description is merely intended to show those skilled in the art the details for implementing preferred examples of the present invention and is not intended to limit the scope of the present invention. Also, the additional features and inventions disclosed can be used separately or together with other features and inventions to provide a further improved work machine.

[0008] Also, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense and are described only for the purpose of explaining representative specific examples of the present invention. Furthermore, the various features of the following representative specific examples, as well as the various features described in the claims, do not have to be combined as described in the specific examples here or in the order listed when providing additional and useful embodiments of the present invention.

[0009] All features described in this specification and / or the claims are intended to be disclosed individually and independently of each other as limitations to the initial disclosure and the specific matters described in the claims, apart from the configuration of the features described in the embodiments and / or the claims. Further, all descriptions regarding numerical ranges and groups or collections are made with the intention of disclosing intermediate configurations as limitations to the initial disclosure and the specific matters described in the claims.

[0010] In one or more embodiments, the first power supply device may further include a first unique engagement portion disposed in the housing. The second power supply device may further include a second unique engagement portion disposed in the housing. The power supply device mounting portion is disposed corresponding to the first unique engagement portion, and includes a first device-side engagement portion engageable with the first unique engagement portion to fix the first power supply device to the power supply device mounting portion, and a second device-side engagement portion disposed corresponding to the second unique engagement portion and engageable with the second unique engagement portion to fix the second power supply device to the power supply device mounting portion.

[0011] In the above configuration, the first power supply device can be firmly fixed to the power supply device mounting portion, and the second power supply device can also be firmly fixed to the power supply device mounting portion.

[0012] In one or more embodiments, the first power supply device and the second power supply device may each further include a common engagement portion disposed in the housing. The power supply device mounting portion is disposed corresponding to the common engagement portion, and may further include a third device-side engagement portion engageable with the common engagement portion to fix the first power supply device or the second power supply device to the power supply device mounting portion.

[0013] In the above configuration, the third device-side engagement portion is engageable with the common engagement portion of the first power supply device and also with the common engagement portion of the second power supply device. Therefore, it is possible to suppress the complication of the configuration of the power supply device mounting portion.

[0014] (Embodiment) With reference to FIGS. 1 to 17, the working machine 2 of the embodiment will be described. As shown in FIG. 1, the working machine 2 is a lawn mower. The working machine 2 is operable using electric power supplied from a first power supply device 28 or a second power supply device 30 described later. The working machine 2 is used in a state of being grounded to the ground. The working machine 2 includes a main body unit 4, a grass collection unit 6, and a handle unit 8. The main body unit 4 includes four wheels 10 that are grounded to the ground. The grass collection unit 6 is detachably attached to the rear end portion of the main body unit 4. The handle unit 8 is connected to the upper portion on the rear side of the main body unit 4. When the user stands on the rear side of the working machine 2 and grips the upper portion of the handle unit 8 with both hands and pushes it forward, the wheels 10 rotate and the main body unit 4 moves forward along the ground. Hereinafter, the direction in which the wheels 10 rotate and the main body unit 4 moves along the ground is referred to as the front-rear direction, the direction orthogonal to the ground is referred to as the up-down direction, and the direction orthogonal to the front-rear direction and the up-down direction is referred to as the left-right direction.

[0015] As shown in FIG. 2, the main body unit 4 includes a deck 12, a drive shaft 14, a cutting blade 16, a fan 18, a motor mounting portion 20, a motor for the cutting blade 22, and an ECU (not shown). The lower surface of the deck 12 is open in a substantially cylindrical shape toward the ground. A substantially circular opening 12a is formed on the upper surface of the deck 12. The space inside the deck 12 communicates with a duct (not shown) that opens toward the rear side of the main body unit 4. When the grass collecting unit 6 (see FIG. 1) is attached to the rear end portion of the deck 12, the space inside the deck 12 communicates with the space inside the grass collecting unit 6 via the duct. The drive shaft 14 extends substantially along the vertical direction. The cutting blade 16 and the fan 18 are disposed in the space inside the deck 12. The cutting blade 16 is fixed to the lower end portion of the drive shaft 14. The cutting blade 16 extends in a direction substantially orthogonal to the vertical direction from the drive shaft 14. The fan 18 is fixed to the drive shaft 14 above the cutting blade 16. When the drive shaft 14 rotates, the cutting blade 16 rotates and the grass on the ground is cut. Also, when the drive shaft 14 rotates, the fan 18 rotates and an air flow from the opening on the lower surface of the deck 12 toward the duct is generated in the space inside the deck 12. Thereby, the grass cut by the cutting blade 16 is sucked up by the fan 18 and sent to the grass collecting unit 6 via the duct.

[0016] The motor mounting portion 20 is fixed to the upper surface of the deck 12. The motor mounting portion 20 fixes the motor for the cutting blade 22. The motor for the cutting blade 22 is, for example, a brushless motor. The motor for the cutting blade 22 rotates the drive shaft 14. The ECU includes, for example, an inverter circuit (not shown) having a plurality of switching elements (not shown) and a control circuit (not shown) that controls the operation of the plurality of switching elements. The ECU controls the operation of the motor for the cutting blade 22 by controlling the electric power supplied from the first power supply device 28 or the second power supply device 30, which will be described later, to the motor for the cutting blade 22.

[0017] The working machine 2 further includes a power supply unit mounting portion 26 shown in FIG. 3. As shown in FIG. 2, the power supply unit mounting portion 26 is fixed to the motor mounting portion 20. The power supply unit mounting portion 26 covers the cutting blade motor 22 from above. Either the first power supply unit 28 (see FIG. 1) or the second power supply unit 30 (see FIG. 13) can be selectively mounted on the power supply unit mounting portion 26. Specifically, when the first power supply unit 28 is mounted on the power supply unit mounting portion 26, the second power supply unit 30 cannot be mounted on the power supply unit mounting portion 26, and when the second power supply unit 30 is mounted on the power supply unit mounting portion 26, the first power supply unit 28 cannot be mounted on the power supply unit mounting portion 26. Hereinafter, first, the first power supply unit 28 will be described.

[0018] The first power supply device 28 shown in Fig. 4 is a part of a backpack battery to which a backrest, a shoulder belt, and a waist belt are attached. The user can carry the backpack battery by wearing the shoulder belt on the shoulders and the waist belt around the waist. The first power supply device 28 includes a first housing 32, four first battery packs BP (see Fig. 5), a first power cord 34 (see Fig. 1), and a first connector 36 (see Fig. 1). The first housing 32 includes a first lower housing 38 and a first upper housing 40. When the first power supply device 28 is attached to the power supply device attachment portion 26, the lower surface 38a of the first lower housing 38 faces the power supply device attachment portion 26. As shown in Fig. 5, four battery attachment portions 42 are arranged on the first lower housing 38. The first battery pack BP is detachable from the battery attachment portion 42. A plurality of battery cells (not shown) are accommodated inside the first battery pack BP. The battery cells include, for example, lithium-ion batteries. The first battery pack BP has, for example, a rated voltage of 18V and a rated capacity of 108Wh. In a state where the four first battery packs BP are attached to the battery attachment portions 42, the rated voltage of the first power supply device 28 is 18V or 36V, and the rated capacity is 436Wh. Thus, by using the first power supply device 28, the work machine 2 can be used for a long time. Also, the weight of the first battery pack BP is, for example, 0.6 kg, and in a state where the four first battery packs BP are attached to the battery attachment portions 42, the weight of the first power supply device 28 is, for example, 7 kg or more. The first upper housing 40 is attached to the first lower housing 38 so as to be openable and closable. When the first upper housing 40 is open, the first battery pack BP can be attached to and detached from the battery attachment portion 42. On the other hand, when the first upper housing 40 is closed, the first battery pack BP is arranged in the internal space defined by the first lower housing 38 and the first upper housing 40. Thus, the four first battery packs BP are accommodated inside the first housing 32.

[0019] As shown in FIG. 4, a first grip 44 is attached to the front end portion of the first lower housing 38. The first grip 44 is gripped by the user. Thus, the user can easily carry the first power supply device 28 by gripping the first grip 44.

[0020] The first power cord 34 shown in FIG. 1 can discharge the power of the first battery pack BP. The first power cord 34 extends from the rear end portion of the first housing 32. The first power cord 34 is routed along the right side surface of the power supply device attachment portion 26. A wiring portion 46 is arranged on the right side surface of the power supply device attachment portion 26. The first power cord 34 extends forward below the wiring portion 46, then extends upward in front of the wiring portion 46, and then extends rearward above the wiring portion 46. Thus, the first power cord 34 is routed around the wiring portion 46, and it is possible to prevent the first power cord 34 from sagging.

[0021] As shown in FIG. 6, the first connector 36 is arranged at the tip of the first power cord 34. The first connector 36 can be inserted into a connector connection portion 48 arranged on the right side surface of the power supply device attachment portion 26. The connector connection portion 48 is arranged on the rear side of the wiring portion 46. A cover 50 is attached to the upper side of the connector connection portion 48 so as to be openable and closable. The cover 50 is biased by a biasing member 52 (see FIG. 8) in a direction to close the connector connection portion 48. When the cover 50 is open, the connector connection portion 48 is open, so the first connector 36 can be inserted into the connector connection portion 48. When the first connector 36 is inserted into the connector connection portion 48, the power of the first battery pack BP can be supplied to the working machine 2. On the other hand, as shown in FIG. 8, when the cover 50 is closed, the connector connection portion 48 is closed by the cover 50, so the first connector 36 cannot be inserted into the connector connection portion 48. Also, when the cover 50 is closed, the cover 50 can prevent liquid from entering the connector connection portion 48.

[0022] As shown in FIG. 6, a key insertion portion 54 is disposed on the rear side of the connector connection portion 48. The key insertion portion 54 includes a key insertion base 56, a waterproof wall 58, a lid member 60, and a biasing member 62. The key insertion base 56 has an upper surface 56a orthogonal to the vertical direction and a key insertion opening 56b disposed on the upper surface 56a. The upper surface 56a is disposed above the connector connection portion 48. As shown in FIG. 7, a lock-off key 64 can be inserted into the key insertion opening 56b along the vertical direction. When the lock-off key 64 is inserted into the key insertion opening 56b with the first connector 36 inserted into the connector connection portion 48, a conduction plate 66 disposed below the lock-off key 64 contacts a conduction portion 68 disposed inside the power supply device mounting portion 26. The conduction portion 68 is disposed between the first battery pack BP and the blade motor 22 in the electric circuit. Thereby, the first battery pack BP and the blade motor 22 are electrically connected. For this reason, the blade motor 22 can be driven by the electric power supplied from the first battery pack BP. On the other hand, when the lock-off key 64 is removed from the key insertion opening 56b with the first connector 36 inserted into the connector connection portion 48, the conduction plate 66 no longer contacts the conduction portion 68. Thereby, the first battery pack BP and the blade motor 22 are electrically disconnected. For this reason, electric power from the first battery pack BP is not supplied to the blade motor 22, and the blade motor 22 cannot be driven. Further, the configuration in which the lock-off key 64 is used is not limited to the configuration of the present embodiment. For example, when the first battery pack BP is directly attached to the power supply device mounting portion 26, or when power is supplied to the working machine 2 from an external power source via a power cord, etc., it is also applicable when other power supply sources are used.

[0023] The lock-off key 64 has a knob hole 70 at its upper part. The knob hole 70 penetrates the lock-off key 64 in the thickness direction. When the lock-off key 64 is inserted into the key insertion opening 56b, the knob hole 70 is disposed above the upper surface 56a. The user can easily pull out the lock-off key 64 upward from the key insertion opening 56b by inserting a finger into the knob hole 70.

[0024] As shown in FIG. 6, the waterproof wall 58 protrudes upward from the upper surface 56a. The waterproof wall 58 surrounds the key insertion port 56b. Thereby, even when there is liquid on the upper surface 56a outside the key insertion port 56b, it is possible to prevent the liquid from entering the key insertion port 56b.

[0025] The lid member 60 is attached to the key insertion base 56 so as to be openable and closable behind the key insertion port 56b and the waterproof wall 58. The lid member 60 is biased by a biasing member 62 in the closing direction (i.e., the direction in which the contact surface 60a of the lid member 60 faces the upper surface 56a of the key insertion base 56). As shown in FIG. 7, in the state where the lid member 60 is closed, a closed space 72 is defined by the lid member 60 and the upper surface 56a. In the closed space 72, a lock-off key 64 inserted into the key insertion port 56b and the waterproof wall 58 are arranged. In the state where the lid member 60 is closed, the contact surface 60a contacts the upper surface 56a so as to surround the waterproof wall 58. Thereby, in the state where the lid member 60 is closed, it is possible to prevent the liquid from entering the closed space 72.

[0026] As shown in FIG. 4, the first power supply device 28 further includes two first common engaging portions 76 and two first specific engaging portions 78. The two first common engaging portions 76 are arranged at the rear part of the lower surface 38a of the first lower housing 38. The two first common engaging portions 76 are arranged side by side in the left-right direction. The first common engaging portion 76 includes an engaging recess 80 and a first common engaging claw 82. The engaging recess 80 is recessed upward from the rear part of the lower surface 38a of the first lower housing 38. As shown in FIG. 9, the first common engaging claw 82 is separated from the bottom surface 80b of the engaging recess 80. The first common engaging claw 82 extends rearward from the side surface 80a of the engaging recess 80. The first common engaging claw 82 is inclined downward from the side surface 80a. Thereby, the engaging recess 80 opens toward the rear side.

[0027] As shown in FIG. 4, the two first specific engagement portions 78 are arranged on the lower surface 38a of the first lower housing 38. The two first specific engagement portions 78 are arranged in front of the two first common engagement portions 76. The two first specific engagement portions 78 are arranged side by side in the left-right direction. The first specific engagement portion 78 includes an engagement recess 86 and two first specific engagement claws 88. The engagement recess 86 is recessed upward from the vicinity of the front end of the lower surface 38a of the first lower housing 38. One engagement recess 86 is connected to the right surface 38b of the first lower housing 38, and the other engagement recess 86 is connected to the left surface 38c of the first lower housing 38. As shown in FIG. 10, the first specific engagement claw 88 is connected to the side surface 86a of the engagement recess 86 and extends in a direction away from the side surface 86a. The first specific engagement claw 88 is arranged away from the bottom surface 86b of the engagement recess 86.

[0028] Next, the power supply device mounting portion 26 shown in FIG. 3 will be described. The power supply device mounting portion 26 includes a base member 92, two first device-side engagement portions 94, a second device-side engagement portion 96, and two third device-side engagement portions 98. The base member 92 has a reference surface 92a. The reference surface 92a faces upward. When the first power supply device 28 is attached to the power supply device mounting portion 26, the reference surface 92a faces the lower surface 38a of the first lower housing 38.

[0029] The two first device-side engaging portions 94, the second device-side engaging portion 96, and the two third device-side engaging portions 98 are arranged on the reference plane 92a. The two first device-side engaging portions 94 are arranged side by side in the left-right direction. The first device-side engaging portion 94 includes a device-side engaging recess 102 and a first device-side engaging claw 104. The device-side engaging recess 102 is recessed downward from the reference plane 92a. One device-side engaging recess 102 is connected to the right surface of the base member 92, and the other device-side engaging recess 102 is connected to the left surface of the base member 92. The first device-side engaging claw 104 is swingably attached to the base member 92. As shown in FIG. 10, the first device-side engaging claw 104 includes a swing shaft 104a, a gripping portion 104b, and a claw portion 104c. The swing shaft 104a extends in the front-rear direction. The swing shaft 104a is attached to the base member 92 within the device-side engaging recess 102. The gripping portion 104b is connected to the swing shaft 104a. The gripping portion 104b is gripped when the user operates the first device-side engaging claw 104. By directly gripping and operating the gripping portion 104b, the user can swing the first device-side engaging claw 104 around the swing shaft 104a extending in the front-rear direction. The claw portion 104c extends in a direction substantially orthogonal to the gripping portion 104b. The claw portion 104c is arranged away from the swing shaft 104a.

[0030] As shown in FIG. 3, the second device-side engaging portion 96 is disposed on the front side of the two first device-side engaging portions 94. In the left-right direction, the second device-side engaging portion 96 is disposed near the center of the base member 92. The second device-side engaging portion 96 includes a rear wall 99, two side walls 100, and a horizontal wall 101. The rear wall 99 extends upward from the reference plane 92a. The upper surface of the rear wall 99 is inclined downward and forward (see FIG. 17). The two side walls 100 extend upward from the reference plane 92a. One side wall 100 is connected to the right end of the rear wall 99, and the other side wall 100 is connected to the left end of the rear wall 99. The two side walls 100 extend to the front side of the rear wall 99. The horizontal wall 101 extends forward from the front surface of the rear wall 99. In the up-down direction, the horizontal wall 101 is connected near the center position of the rear wall 99 (see FIG. 17). The right end of the horizontal wall 101 is connected to one side wall 100, and the left end of the horizontal wall 101 is connected to the other side wall 100.

[0031] The two third device-side engaging portions 98 are arranged on the rear side of the two first device-side engaging portions 94 and the second device-side engaging portion 96. The two third device-side engaging portions 98 are arranged side by side in the left-right direction. The third device-side engaging portion 98 includes a device-side engaging recess 106, an engaging member 108, an auxiliary member 110, a swing shaft 112 (see FIG. 11), and a biasing member 114 (see FIG. 11). The device-side engaging recess 106 is recessed downward from the reference plane 92a. As shown in FIG. 3, the engaging member 108 protrudes upward from the reference plane 92a. The engaging member 108 is made of, for example, a metal material or a resin material. As shown in FIG. 11, the engaging member 108 includes a lower engaging portion 118, a rear engaging portion 120, and an upper engaging portion 122. Note that FIG. 11 illustrates the postures of the engaging member 108, the auxiliary member 110, the swing shaft 112, and the biasing member 114 when they are in the initial position. The lower engaging portion 118 extends in the front-rear direction. The rear engaging portion 120 is connected to the rear end portion of the lower engaging portion 118. The rear engaging portion 120 extends in the up-down direction. The upper end portion of the rear engaging portion 120 is arranged above the upper end portion of the lower engaging portion 118. An insertion hole 124 penetrating the rear engaging portion 120 in the left-right direction is formed in the lower rear portion of the rear engaging portion 120. The upper engaging portion 122 extends forward from the upper front portion of the front surface of the rear engaging portion 120. The upper engaging portion 122 gradually becomes thinner toward the front. As shown in FIG. 9, when the engaging member 108 is in the initial position, the upper engaging portion 122 and the upper half of the rear engaging portion 120 protrude upward from the reference plane 92a.

[0032] As shown in FIG. 3, the auxiliary member 110 protrudes upward from the reference plane 92a. The auxiliary member 110 is made of, for example, a metal material or a resin material. The strength of the auxiliary member 110 is lower than the strength of the engaging member 108. As shown in FIG. 11, the auxiliary member 110 includes a lower auxiliary portion 126 and an upper auxiliary portion 128. The lower auxiliary portion 126 is disposed between the right wall 120a and the left wall 120b of the rear engaging portion 120. The lower auxiliary portion 126 extends upward. The upper end portion of the lower auxiliary portion 126 is disposed slightly above the upper end portion of the rear engaging portion 120. The upper auxiliary portion 128 extends forward from the upper end portion of the lower auxiliary portion 126. The vertical length of the upper auxiliary portion 128 gradually increases from the upper end portion of the lower auxiliary portion 126 toward the front side and then becomes constant. Although not shown, when the auxiliary member 110 is in the initial position, the upper auxiliary portion 128 and the upper half of the lower auxiliary portion 126 protrude upward from the reference plane 92a.

[0033] The swing shaft 112 is inserted into an insertion hole 124 formed in the rear engaging portion 120 and an insertion hole (not shown) formed in the lower auxiliary portion 126. Thereby, the engaging member 108 and the auxiliary member 110 are swingably supported by the base member 92 via the swing shaft 112. Further, the engaging member 108 is movable relative to the auxiliary member 110. As shown in FIG. 9, the swing shaft 112 is attached to the base member 92 within the device-side engaging recess 106, and both ends of the swing shaft 112 protrude outside the base member 92. Retaining members 132 (see FIG. 11) are attached to both ends of the swing shaft 112. The retaining members 132 prevent the swing shaft 112 from coming off the base member 92.

[0034] As shown in FIG. 11, the biasing member 114 is, for example, a torsion spring. The swing shaft 112 is inserted into the biasing member 114. The biasing member 114 biases the auxiliary member 110 toward the initial position. Further, when the lower auxiliary portion 126 abuts against the rear engaging portion 120, the engaging member 108 is biased toward the initial position by the biasing force of the biasing member 114.

[0035] Next, the operation of attaching the first power supply device 28 to the power supply device mounting portion 26 will be described. The user inserts the first common engagement claw 82 into the space between the lower engagement portion 118 and the upper engagement portion 122 of the engagement member 108 with the first power supply device 28 inclined with respect to the reference surface 92a of the base member 92. As a result, without the engagement member 108 being directly operated by the user, the upper engagement portion 122 is inserted into the engagement recess 80 of the first common engagement portion 76, and the first common engagement portion 76 engages with the third device-side engagement portion 98. As shown in FIG. 12, when the first common engagement claw 82 abuts against the rear engagement portion 120 of the engagement member 108, the engagement member 108 swings rearward around the swing axis 112 and assumes a posture inclined with respect to the reference surface 92a. Further, the upper auxiliary portion 128 of the auxiliary member 110 abuts against the first lower housing 38 of the first power supply device 28 without being directly operated by the user and swings rearward around the swing axis 112.

[0036] Next, the user tilts the first power supply device 28 in the tilted state toward the reference surface 92a and brings the lower surface 38a of the first lower housing 38 into contact with the reference surface 92a. As shown in FIG. 9, the upper surface of the lower engagement portion 118 and the upper surface of the upper engagement portion 122 come into contact with the first lower housing 38, swing forward around the swing axis 112, and return to the initial position. On the other hand, although the auxiliary member 110 swings forward while abutting against the first lower housing 38 by the biasing force of the biasing member 114, it does not return to the initial position shown in FIG. 3.

[0037] Next, the user directly operates the gripping portion 104b of the first device-side engagement claw 104 to swing the first device-side engagement claw 104 in the direction toward the first lower housing 38. Then, as shown in FIG. 10, the user engages the claw portion 104c of the first device-side engagement claw 104 with the first specific engagement claw 88. As a result, the first power supply device 28 is fixed and attached to the power supply device mounting portion 26 without the lower surface 38a of the first lower housing 38 lifting from the reference surface 92a.

[0038] When removing the first power supply device 28 from the power supply device mounting portion 26, the user directly operates the gripping portion 104b of the first device-side engaging claw 104 to swing the first device-side engaging claw 104 in a direction away from the first lower housing 38. Thereafter, the user tilts the first power supply device 28 in a direction away from the reference plane 92a and pulls out the upper engaging portion 122 from the engaging recess 80. As a result, the engagement between the engaging member 108 and the auxiliary member 110 is released without the user directly operating them, and the engagement between the first common engaging portion 76 and the third device-side engaging portion 98 is released. Also, the auxiliary member 110 swings forward by the biasing force of the biasing member 114. When the auxiliary member 110 abuts against the engaging member 108, both the engaging member 108 and the auxiliary member 110 swing forward by the biasing force of the biasing member 114 and return to the initial position shown in FIG. 3.

[0039] Next, the second power supply device 30 will be described. As shown in FIG. 13, the second power supply device 30 can be attached to the power supply device mounting portion 26. The second power supply device 30 is a part of a backpack battery to which a backpack, a shoulder belt, and a waist belt are attached to the second power supply device 30. The weight of the second power supply device 30 is, for example, 7 kg or more. As shown in FIG. 14, the second power supply device 30 includes a second housing 140, two cell holders 142 (see FIG. 15), a second power cord 144, and a second connector 146. The shape of the second housing 140 is different from the shape of the first housing 32. The second housing 140 includes a second lower housing 150 and a second upper housing 152. When the second power supply device 30 is attached to the power supply device mounting portion 26, the lower surface 150a of the second lower housing 150 faces the reference plane 92a of the base member 92. The second lower housing 150 is fixed to the second upper housing 152 using screws (not shown).

[0040] As shown in FIG. 15, a second grip 154 is swingably attached to the front end portion of the second lower housing 150. The second grip 154 is gripped by the user in the raised state. Thereby, the user can easily carry the second power supply device 30 by gripping the second grip 154.

[0041] The two cell holders 142 are accommodated inside the second housing 140. In FIG. 15, the second upper housing 152 is removed to facilitate understanding of the positional relationship between the two cell holders 142. The two cell holders 142 are arranged side by side in the left - right direction. The cell holder 142 houses a plurality of battery cells (not shown). The battery cells include, for example, lithium - ion batteries. The rated voltage of the second power supply device 30 is, for example, 18V or 36V, and the rated capacity is 416Wh. Thereby, by using the second power supply device 30, the work machine 2 can be used for a long time.

[0042] The second power cord 144 can discharge the power of the cell holder 142. The second power cord 144 extends from the rear end portion of the second housing 140. Although not shown, since the second power cord 144 is shorter than the first power cord 34, in the state where the second power supply device 30 is attached to the power supply device attachment portion 26, it is not routed around the wiring portion 46 (see FIG. 1) arranged on the right surface of the power supply device attachment portion 26.

[0043] The second connector 146 is arranged at the tip of the second power cord 144. The second connector 146 can be inserted into the connector connection portion 48 (see FIG. 6) arranged on the right surface of the power supply device attachment portion 26.

[0044] As shown in FIG. 14, the second power supply device 30 further includes two second common engagement portions 156 and a second unique engagement portion 158. The two second common engagement portions 156 are disposed at the rear of the lower surface 150a of the second lower housing 150. The second common engagement portion 156 includes a second common engagement claw 160 and a plurality of reinforcing members 162. As shown in FIG. 16, the second common engagement claw 160 extends rearward from the rear of the second lower housing 150. The second common engagement claw 160 is inclined downward from the rear of the second lower housing 150. Each of the plurality of reinforcing members 162 is connected to the rear of the second lower housing 150 and the lower surface of the second common engagement claw 160. The plurality of reinforcing members 162 suppress, for example, breakage of the second common engagement claw 160 when an external force in the vertical direction is applied to the second common engagement claw 160.

[0045] As shown in FIG. 14, the second unique engagement portion 158 is disposed at the front end of the second lower housing 150. The second unique engagement portion 158 is disposed on the front side of the two second common engagement portions 156. As shown in FIG. 17, the second unique engagement portion 158 includes a second unique engagement claw 166, a swing shaft 168, an operation member 170, and a biasing member 172. The second unique engagement claw 166 extends forward and downward from a swing shaft 168 extending in the left-right direction, then bends and extends downward, and further bends and extends rearward. The swing shaft 168 extends along the left-right direction and is attached to the second lower housing 150. The operation member 170 is connected to the upper end of the swing shaft 168. The operation member 170 is biased toward the initial position by the biasing member 172. The operation member 170 is exposed from the second lower housing 150. Therefore, the operation member 170 can be operated by the user.

[0046] Next, the operation of attaching the second power supply device 30 to the power supply device mounting portion 26 will be described. With the second power supply device 30 tilted with respect to the reference surface 92a of the base member 92, the user inserts the second common engagement claw 160 shown in FIG. 14 into the space between the lower engagement portion 118 and the upper engagement portion 122 of the engagement member 108. As a result, the second common engagement portion 156 engages with the third device-side engagement portion 98. When the second common engagement claw 160 abuts against the rear engagement portion 120 of the engagement member 108, similar to when the first power supply device 28 is attached to the power supply device mounting portion 26, the engagement member 108 swings rearward around the swing axis 112 and assumes a posture tilted with respect to the reference surface 92a. Further, the auxiliary member 110 abuts against the second lower housing 150 and swings rearward around the swing axis 112.

[0047] Next, the user tilts the second power supply device 30 in the tilted state toward the reference surface 92a and brings the lower surface 150a of the second lower housing 150 into contact with the reference surface 92a. As shown in FIG. 16, the upper surface of the lower engagement portion 118 abuts against the second lower housing 150, swings forward around the swing axis 112, and returns to the initial position shown in FIG. 3. On the other hand, although the auxiliary member 110 swings forward while abutting against the second lower housing 150 due to the biasing force of the biasing member 114, it does not return to the initial position shown in FIG. 3.

[0048] Further, when the second power supply device 30 in the tilted state is tilted toward the reference surface 92a and the second unique engagement claw 166 abuts on the upper surface of the rear wall 99 of the second device-side engagement portion 96, the second unique engagement claw 166 swings in the first direction around the swing axis 168. In FIG. 17, the first direction is equal to the clockwise direction. As shown in FIG. 17, when the tip of the second unique engagement claw 166 moves below the horizontal wall 101, the second unique engagement claw 166 swings in the second direction around the swing axis 168 by the biasing force received by the operating member 170 from the biasing member 172 and engages with the horizontal wall 101. Thereby, the lower surface 150a of the second lower housing 150 does not lift from the reference surface 92a, and the second power supply device 30 is fixed and attached to the power supply device attachment portion 26. Note that the second direction is the direction opposite to the first direction.

[0049] When removing the second power supply device 30 from the power supply device attachment portion 26, the user pushes the operating member 170 with a finger. Thereby, the second unique engagement claw 166 swings in the first direction, and the engagement between the second unique engagement claw 166 and the horizontal wall 101 is released. In this state, the user tilts the second power supply device 30 in a direction away from the reference surface 92a and pulls out the second common engagement claw 160 from the space between the lower engagement portion 118 and the upper engagement portion 122 of the engagement member 108. Thereby, the engagement between the second common engagement portion 156 and the third device-side engagement portion 98 is released without the engagement member 108 and the auxiliary member 110 being directly operated by the user. Further, due to the biasing force of the biasing member 114, both the engagement member 108 and the auxiliary member 110 swing toward the front side and return to the initial positions shown in FIG. 3.

[0050] (Effect) The working machine 2 of this embodiment is operable using the electric power supplied from the first power supply device 28 or the second power supply device 30, and is used in a state of being grounded to the ground. The first power supply device 28 includes a battery cell, a first housing 32 that houses the battery cell, a first power cord 34 that extends from the first housing 32 and discharges electric power, and a first connector 36 disposed at an end of the first power cord 34. The second power supply device 30 includes a battery cell, a second housing 140 that houses the battery cell, a second power cord 144 that extends from the second housing 140 and discharges electric power, and a second connector 146 disposed at an end of the second power cord 144. The first housing 32 of the first power supply device 28 and the second housing 140 of the second power supply device 30 have different shapes from each other. The working machine 2 includes a power supply device attachment portion 26 to which either the first power supply device 28 or the second power supply device 30 can be selectively attached, and a connector connection portion 48 to which the first connector 36 or the second connector 146 is connected.

[0051] In the above configuration, the working machine 2 can be used by attaching the first power supply device 28 to the power supply device attachment portion 26, or the working machine 2 can be used by attaching the second power supply device 30 having the second housing 140 different in shape from the first housing 32 of the first power supply device 28 to the power supply device attachment portion 26. Thereby, a plurality of types of power supply devices 28, 30 having different housing shapes 32, 140 can be used for the working machine 2.

[0052] Further, the first power supply device 28 further includes a first unique engagement portion 78 disposed in the first housing 32. The second power supply device 30 further includes a second unique engagement portion 158 disposed in the second housing 140. The power supply device mounting portion 26 is disposed corresponding to the first unique engagement portion 78, and includes a first device-side engagement portion 94 that can engage with the first unique engagement portion 78 to fix the first power supply device 28 to the power supply device mounting portion 26, and a second device-side engagement portion 96 that is disposed corresponding to the second unique engagement portion 158 and can engage with the second unique engagement portion 158 to fix the second power supply device 30 to the power supply device mounting portion 26.

[0053] In the above configuration, the first power supply device 28 can be firmly fixed to the power supply device mounting portion 26, and the second power supply device 30 can also be firmly fixed to the power supply device mounting portion 26.

[0054] Further, the first power supply device 28 further includes a first common engagement portion 76 disposed in the first housing 32. The second power supply device 30 further includes a second common engagement portion 156 disposed in the second housing 140. The power supply device mounting portion 26 is disposed corresponding to the first common engagement portion 76 and the second common engagement portion 156, and further includes a third device-side engagement portion 98 that can engage with the first common engagement portion 76 or the second common engagement portion 156 to fix the first power supply device 28 or the second power supply device 30 to the power supply device mounting portion 26.

[0055] In the above configuration, the third device-side engagement portion 98 can engage with the first common engagement portion 76 of the first power supply device 28 and can also engage with the second common engagement portion 156 of the second power supply device 30. Therefore, it is possible to suppress the complexity of the configuration of the power supply device mounting portion 26.

[0056] The engagement member 108 according to one embodiment may be swingable around a swing axis, and the auxiliary member 110 may be swingable around another swing axis.

[0057] The strength of the engagement member 108 according to one embodiment may be equal to or less than the strength of the auxiliary member 110.

[0058] The working machine 2 according to one embodiment is not limited to a lawn mower, and may be, for example, a transport vehicle, a tiller, a sweeper for sweeping the floor, a cleaner, or a lifter.

Claims

1. An operating machine that can operate using electric power supplied from a first power supply device or a second power supply device and is used in a state of being grounded to the ground, The first power supply device and the second power supply device each, A battery cell, A housing that houses the battery cell, A power cord that extends from the housing and discharges electric power, And a connector disposed at an end of the power cord, The housing of the first power supply device and the housing of the second power supply device have different shapes from each other, The operating machine, A power supply device attachment portion that can selectively attach either the first power supply device or the second power supply device, And a connector connection portion to which the connector is connected. An operating machine.

2. The first power supply device further includes a first unique engagement portion disposed in the housing, The second power supply device further includes a second unique engagement portion disposed in the housing, The power supply device attachment portion, Is disposed corresponding to the first unique engagement portion, and a first device-side engagement portion that can engage with the first unique engagement portion to fix the first power supply device to the power supply device attachment portion, Is disposed corresponding to the second unique engagement portion, and a second device-side engagement portion that can engage with the second unique engagement portion to fix the second power supply device to the power supply device attachment portion. The operating machine according to claim 1.

3. The first power supply device and the second power supply device each further include a common engagement portion disposed in the housing, The power supply device mounting portion is arranged corresponding to the common engaging portion, and further includes a third device-side engaging portion that can be engaged with the common engaging portion to fix the first power supply device or the second power supply device to the power supply device mounting portion. The work machine according to claim 2.

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