JP2013021952A - Walking type electric working implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the maintainability of and the heat dissipation in an electric motor and a battery.SOLUTION: A rotor cover 3 which covers the upper part of a tilling rotor 2 arranged at the lower part of a working implement has a double structure in which a lower cover 3A and an upper cover 3B, separated up and down from each other, are equipped. The electric motor 4 which drives the tilling rotor 2 and the battery 5 which supplies electricity to the electric motor 4 are arranged above the lower cover 3A so that the each upper side part of the electric motor 4 and the battery 5 projects and is exposed upward from the upper cover 3B. An electric wire 18 connecting the electric motor 4 and the battery 5 passes between the lower cover 3A and the upper cover 3B.

Description

  The present invention relates to a walking electric work machine including an electric motor that drives a tilling rotor and a battery that supplies electric power to the electric motor.

  As a walking type electric working machine as described above, an electric motor and a battery are arranged on the upper surface of a rotor cover (fender) that covers the top of the tilling rotor (cultivation claw), and an upper cover that covers these electric motor and battery from above. There is a configuration in which an electric motor and a battery are accommodated in a space surrounded by the rotor cover and the upper cover by detachably attaching the rotor cover to the rotor cover (see, for example, Patent Document 1).

JP 2004-276800 A (paragraph numbers 0017, 0022, 0024, 0025, FIGS. 1 to 7)

  In the above configuration, there is room for improvement in terms of maintainability since it takes time to remove the upper cover when performing maintenance of the electric motor and the battery. Moreover, the heat radiation of the electric motor and the battery tends to be trapped in the storage space for the electric motor and the battery surrounded by the rotor cover and the upper cover, and the heat dissipation of the electric motor and the battery tends to be lowered.

  The objective of this invention is improving the maintainability with respect to an electric motor and a battery, and the heat dissipation of an electric motor and a battery.

1st invention is a walk type electric working machine,
The rotor cover that covers the top of the tillage rotor deployed in the lower part of the fuselage is configured in a double structure comprising a lower cover part and an upper cover part spaced apart vertically,
A state in which the electric motor that drives the tilling rotor and the battery that supplies power to the electric motor are exposed above the lower cover portion and the upper sides of the electric motor and the battery protrude upward from the upper cover portion. Deploy with
An electric wire connecting the electric motor and the battery is passed between the lower cover portion and the upper cover portion.

  According to the first invention, since the electric motor and the battery are arranged above the lower cover portion of the rotor cover, the lower cover portion protects the electric motor and the battery from soil and the like that the tilling rotor jumps off during work. It is possible to prevent damage to the electric motor and the battery due to adhesion or collision of soil during long-term use.

  And since each upper side of an electric motor and a battery is made into the state which protrudes and exposes upwards from the upper cover part of a rotor cover, compared with the case where the whole electric motor and a battery are covered with an upper cover part, an upper cover A part can be formed in the shape which is not bulky with low height, and the whole body can be comprised compactly. In addition, maintenance for the electric motor and the battery can be easily performed without requiring the trouble of removing the upper cover portion, and heat dissipation of the electric motor and the battery can be promoted.

  In addition, the electric wire connecting the electric motor and the battery can be routed between the lower cover portion and the upper cover portion while the entire body is compactly configured as described above. The lower cover portion can protect the electric wire from the soil that the tilling rotor jumps off during the work, and can prevent the occurrence of disconnection due to the collision of the soil during long-term use. In addition, the upper cover portion can prevent rainwater from falling on the electric wire.

  Therefore, while configuring the entire body compactly, durability and heat dissipation of the electric motor and battery, maintainability for the electric motor and battery, and durability and waterproofness of the electric wire connecting the electric motor and the battery, Can be improved.

According to a second invention, in the first invention,
A main frame that supports the battery is disposed between the lower cover portion and the upper cover portion.

  According to the second aspect of the invention, the lower cover portion can protect the main frame from soil and the like that the tilling rotor jumps during work, and the upper cover portion prevents rain water from falling on the main frame. Can do.

  Therefore, corrosion of the main frame due to adhesion of soil, rainwater, etc. can be prevented, and durability can be improved.

It is a whole side view of a walking type electric working machine in the state where a steering handle was changed to a work posture. It is the whole walk type electric work machine in the state where the control handle was changed to the storing posture and the storage box was attached. It is a partial vertical side view of the walking type electric working machine in a state where the steering handle is switched to the retracted posture and the storage box is attached. It is a vertical side view which shows the structure of the principal part in a walk type electric working machine. It is a partial vertical front view of the principal part which shows structures, such as a storage box. It is a disassembled perspective view of the principal part which shows structures, such as a main frame and a lower side cover part. It is a perspective view of the principal part which shows structures, such as a main frame and a lower side cover part. It is a vertical back view of the principal part which shows structures, such as a rotor cover and a battery mounting part. It is a top view of the principal part which shows structures, such as a steering handle and a battery mounting part. It is a side view of the principal part which shows the fixing structure of a battery. It is a cross-sectional top view of the principal part which shows the fixing structure of a battery. It is a partially longitudinal rear view of the principal part showing the fixing structure of the swing arm.

  Hereinafter, as an example of an embodiment for carrying out the present invention, an embodiment in which the present invention is applied to a walking electric work machine will be described with reference to the drawings.

  As shown in FIGS. 1 to 5, the walking electric work machine exemplified in the present embodiment is equipped with a pair of left and right tilling rotors 2 at the lower part of the body frame 1, and left and right tilling rotors 2 at the upper part of the body frame 1. A rotor cover 3 that covers the upper side, an electric motor 4 that drives the right and left tilling rotors 2, a battery 5 that supplies power to the electric motor 4, and a steering handle 6 that can be changed in posture by swinging back and forth. It is.

  The fuselage frame 1 has a main frame 7 that supports the battery 5 bolted to a transmission case 8 that also serves as a frame member, and extends to the rear end of the main frame 7 from the rear end to the rear upper side in a rearward inclined posture. In this state, the handle frame 9 is welded, and the support member 10 is welded to the left and right central portions of the lower end portion of the handle frame 9 so as to extend rearward from the left and right central portions.

  As shown in FIGS. 4 and 6 to 8, the main frame 7 includes a battery support portion 7 </ b> A having a cross shape in plan view on the upper surface, and a pair of left and right front connection arm portions 7 </ b> B in the vertical direction that also serves as a reinforcing rib. It is made of a sheet metal bent into a shape having a connecting arm portion 7C, and the left and right rear connecting arm portions 7C are provided with an opening 7D that opens as the battery support portion 7A is formed. Then, the extension end of the front connection arm portion 7B extending forward is bolted to the upper portion of the transmission case 8, and the extension end of the rear connection arm portion 7C extending downward is bolted to the lower portion of the transmission case 8. As a result, the battery support portion 7A on the upper surface is disposed on the upper part of the machine body in a state of being lowered downward.

  As shown in FIGS. 1 to 5, the transmission case 8 is formed in a left and right bifurcated structure having a substantially L-shape in side view, which incorporates the worm speed reducer 11, and the electric motor 4 is attached to the flange 8 </ b> A formed at the upper end portion thereof. Are connected with bolts. And the output shaft 4A of the electric motor 4 and the input shaft 11A of the worm reduction gear 11 are connected in the inside. The worm speed reducer 11 includes an output shaft 11B extending from the lower end portion of the transmission case 8 to the left and right, and the tilling rotor 2 corresponding to the output shaft 11B is connected in a state of rotating integrally.

  As shown in FIGS. 1 to 7 and 9, the handle frame 9 has a straight second member 9B made of a round pipe material across both ends of a first member 9A made of a round pipe material bent into a U shape. Welded in the left-right direction, and welded with a star washer-like engagement member 9C in which a plurality of engagement irregularities are aligned on the ring-shaped lateral outer surface at both ends of the second member 9B. The posture of the main frame 7 is set to a rearward inclined posture that is perpendicular to the battery support portion 7A in a rearwardly lowered posture.

  The steering handle 6 is formed by connecting an intermediate portion of a pair of left and right handle members 6A made of a round pipe material bent in a shape of a side view with a straight connection member 6B made of a round pipe material. A star washer-like engagement member 6C in which a plurality of engagement irregularities are formed in alignment on the ring-shaped lateral inner surface is welded to one end of 6A, and a rubber grip 6D or the like is attached to the other end of the left and right handle members 6A. Equipped with. Then, with the left and right engaging members 6C facing the corresponding engaging members 9C of the handle frame 9, the bolts 12 that also serve as the swing fulcrum shaft of the steering handle 6 are connected to the engaging members 6C and 9C and the connecting members. 6B is inserted from the left, and a nut 13 with a knob is screwed into the right end portion of the bolt 12 so as to be connected to the extended end portion (rear upper end portion) of the handle frame 9 so as to be able to swing back and forth.

  With this configuration, the steering handle 6 is operated to operate the nut 13 with a knob screwed to the right end portion of the bolt 12 to allow the steering handle 6 to swing back and forth with respect to the handle frame 9 and to allow back and forth swinging. Can be switched to a fixed release state. Then, by switching to the unlocked state, the attitude of the steering handle 6 is extended from the upper end of the handle frame 9 to the rear upper side (see FIG. 1), and the entire steering handle 6 is tilted forward and the fuselage. It can be changed to a retracted posture (see FIGS. 2 and 3) located directly above the frame 1, and the working posture can be adjusted by changing the angle according to the extension of the worker. In the retracted posture, the vertical length of the entire work machine can be shortened to a size that can be stored in the trunk of the automobile.

  As shown in FIGS. 1-9, the rotor cover 3 is comprised by the double structure provided with 3 A of lower side cover parts and the upper side cover part 3B which are arrange | positioned at intervals up and down. The lower cover portion 3A is made of sheet metal and is connected to the front connecting arm portion 7B and the rear connecting arm portion 7C, which are lateral sides of the main frame 7, so that the pair of left and right cover members 14 are positioned above the corresponding tilling rotor 2. Bolts are connected from the outside. The upper cover portion 3 </ b> B is configured by a resin cover body 15 formed so that both left and right end portions thereof are wider than the lateral outer ends of the left and right tillage rotors 2. The rear portion is bolted to the battery support portion 7 </ b> A of the main frame 7, and the front portion is bolted to a support stay 16 that is connected to the front upper end portion of the transmission case 8 together with the electric motor 4.

  The left and right cover members 14 are a front cover portion 14A positioned right above the tilling rotor 2 in a posture orthogonal to the electric motor 4, and a rear side positioned above the rear portion of the tilling rotor 2 in the same rearwardly lowered posture as the battery support portion 7A. It is bent and formed in the shape of a side view having the cover portion 14B. And the outer side wall 14C which serves as a reinforcement rib is standingly formed in the lateral outer side end of each of these cover parts 14A and 14B, V-shaped clearance gap formed between them over those outer side walls 14C A plate 17 that reinforces the cover member 14 is welded. Further, at the lateral inner end of the front cover portion 14A, a recess 14D in which a lower portion of the flange 8A in the transmission case 8 is engaged, and a front connection piece 14E that enables bolt connection with the corresponding front connection arm portion 7B. And the like, and at the lateral inner end of the rear cover portion 14B, the rear connection piece 14F enabling the bolt connection with the corresponding rear connection arm portion 7C and the connection to the main frame 7 A tongue piece 14G that is inserted through the left and right openings 7D of the main frame 7 is formed.

  In the state where each cover member 14 is bolted to the main frame 7, the front cover portion 14 </ b> A of each cover member 14 is positioned between the left and right tillage rotors 2 and the flange 8 </ b> A of the transmission case 8 and left and right tillage rotors. 2 is in a state where it catches the soil that jumps off, and the rear cover portion 14B of each cover member 14 is located between the left and right tilling rotors 2 and the battery 5 together with the main frame 7, and the left and right tilling rotors 2 are It will be in a state where it catches the soil that it bounces off. The upper surfaces of the cover portions 14A and 14B are between the front connecting arm portion 7B and the rear connecting arm portion 7C of the main frame 7, the outer wall 14C of each cover member 14, and the plate 17, and The electric wire 18 connected to the battery 5 is configured to function as a mounting surface that enables mounting. Further, the extending end side of each tongue piece 14G that passes through the left and right openings 7D of the main frame 7 overlaps vertically below the battery support portion 7A in the main frame 7, so that each tongue piece 14G becomes a battery support portion 7A. And a cover that covers the connector 19 for battery connection from below, and a bridge that spans the mounting surface of the left and right rear cover portions 14B between the left and right openings 7D.

  The cover body 15 is formed in a shape that covers the upper side of the left and right tillage rotors 2 and the upper side of the main frame 7 and the left and right cover members 14 in a state of being bolted to the battery support portion 7A and the support stay 16 of the main frame 7. It is. An opening 15A through which the upper side of the electric motor 4 is inserted is formed in the front part of the cover body 15, and the upper side of the electric motor 4 exposed upward from the opening 15A is made of resin. The motor cover 20 is detachably engaged and connected. A battery mounting recess 15B is integrally formed at the rear of the cover body 15. The battery mounting recess 15B has a substantially rectangular bottom 15Ba that is bolted to the battery support 7A in a rearward lowered posture along the battery support 7A of the main frame 7, and a battery 5 that rises in parallel with the handle frame 9 A peripheral wall portion 15Bb surrounding the lateral outer periphery of the lower portion of the battery, and the bottom portion 15Ba has an opening that allows connection between the connector 5A provided at the bottom of the battery 5 inserted into the recess 15B and the connector 19 of the battery support portion 7A. 15Bc is formed.

  From the above configuration, the electric motor 4 and the battery 5 are arranged above the lower cover portion 3A covering the upper sides of the left and right tilling rotors 2 with their upper sides protruding upward from the upper cover portion 3B and exposed. Therefore, compared with the case where the electric motor 4 and the battery 5 are entirely covered with the upper cover portion 3B while the electric motor 4 and the battery 5 can be protected from the soil that the right and left tilling rotors 2 fly off during the work. Thus, the upper cover 3B can be formed into a low and non-bulky shape, the entire body can be configured compactly, and the electric motor is not required to remove the upper cover 3B. 4 and the battery 5 can be easily maintained, and heat dissipation of the electric motor 4 and the battery 5 can be promoted.

  And while comprising the whole body compactly as mentioned above, the electric wire 18 which connects the connector 4B with which the lower end part of the electric motor 4 was equipped, and the connector 19 of battery support part 7A, and the connector of battery support part 7A 19 and an electric wire 18 that connects a tillage switch (not shown) and an emergency stop switch (not shown) provided on the steering handle 6 are provided between the lower cover portion 3A and the upper cover portion 3B. It is possible to route along the placement surface and the tongue piece 14G while passing through the opening 7D of the main frame 7 on each of the 14 placement surfaces and the tongue piece 14G. Accordingly, the lower cover portion 3A can prevent the soil, etc., that the right and left tilling rotors 2 have jumped off during the operation from colliding with the electric wire 18, and the disconnection caused by the collision of the soil or the like in a long-term use. Can be prevented.

  Further, the tongue piece 14G of each cover member 14 constituting the lower cover portion 3A functions as a cover that covers the connector 19 of the battery support portion 7A from below, so that the soil left and right tilling rotor 2 jumps off during the work. Can be prevented from violently colliding with the connector 19 of the battery support portion 7A or the battery-side connector 18A of the electric wire 18 connected to the connector 19, and the battery caused by the collision of soil or the like in a long-term use. Damage to each connector 18A, 19 can be prevented.

  Furthermore, the rain water falls on the electric motor 18 and the electric wire 18 routed along the mounting surface of the cover member 14 and the tongue piece 14G across the connector 4B of the electric motor 4, the connector 4B of the electric motor 4, and the connector 19 of the battery support portion 7A. This can be prevented by the cover portion 3B and the motor cover 20, and thus the waterproof property for the electric motor 4 and the electric wire 18 can be improved.

  In addition, the lower cover portion 3A that protects the connector 19 and the electric wires 18 from the soil that the left and right tilling rotors 2 fly off during work is made of sheet metal, and the upper cover portion that protects the electric motor 4 and the electric wires 18 from rainwater and the like. By making the 3B and the motor cover 20 made of resin, it is possible to reduce the weight of the rotor cover 3 as a whole while improving the durability of the lower cover portion 3A.

  In addition, the main frame 7 is provided between the left and right cover members 14 constituting the lower cover portion 3A and is covered with the upper cover portion 3B so that the main frame is provided with the battery support portion 7A. 7 is located between the lower cover portion 3A and the upper cover portion 3B, so that the upper side of the main frame 7 can be concealed by the rotor cover 3 and the appearance of the airframe is improved. Can do. Further, the upper cover portion 3B can prevent rainwater and the like from falling on the main frame 7, and can prevent corrosion of the main frame 7 due to adhesion of rainwater and the like.

  As shown in FIGS. 1 to 11, a battery mounting portion 23 composed of a battery support portion 7 </ b> A of the main frame 7 and a concave portion 15 </ b> B of the cover body 15 is provided immediately before the handle frame 9 in the main frame 7. The left side portion of the handle frame 9 is provided with a fixture 24 that prevents the battery 5 from being lifted from the battery mounting portion 23 due to vibration during operation. The first member 9 </ b> A of the handle frame 9 is formed such that the distance between the left and right centers is the same as the left and right width of the battery 5 or narrower than the left and right width of the battery 5.

  The fixture 24 is engaged with the battery 5 on a left and right support shaft 25 which is welded so as to extend inside the handle frame 9 at a position lower than the upper surface of the battery 5 in the left side portion of the handle frame 9. It swings back and forth over a front working position that prevents the battery 5 from being detached from the battery mounting portion 23 and a rear retreating position that releases the engagement with the battery 5 and allows the battery 5 to be attached to and detached from the battery mounting portion 23. Equipped with mobility. Further, the biasing means 26 comprising a torsion spring fitted around the left and right support shaft 25 is oscillated and biased forward from the retracted position toward the operating position.

  The fixing tool 24 includes a pair of left and right fitting portions 24A that are externally fitted to the left and right support shafts 25, and an engaging portion 24B that is engaged with the battery 5 by contacting the upper surface of the battery 5 at the operating position. An operation portion 24C that is located above the engaging portion 24B and that allows the swinging operation from the working position of the fixture 24 against the action of the biasing means 26 to the retracted position, and the left side of the first member 9A. An abutment portion 24D that restricts the forward swinging of the fixture 24 from the acting position by the action of the biasing means 26 by the abutment with the standing portion 9a is formed. The operation portion 24C is provided with a cam surface 24E for reversing and swinging the fixture 24 from the operating position to the retracted position against the action of the urging means 26 in contact with the battery 5 attached to the battery mounting portion 23. It is formed.

  The battery 5 employs a lithium ion battery that incorporates a microcomputer (not shown) that performs voltage / current control for monitoring the remaining amount and temperature of the battery 5 to prevent overdischarge and overcharge. . At the front upper part of the battery 5 is provided with a gripping part 5B that facilitates attachment / detachment of the battery 5 to / from the battery mounting part 23 and transportation of the battery 5 in a left-right orientation. An indicator 5C for displaying the remaining amount of the battery 5 and the like is provided.

  From the above configuration, when the battery 5 is attached to the battery mounting portion 23, while holding the steering handle 6 or the handle frame 9 with one hand, while holding the grip 5B of the battery 5 with the other hand, The battery 5 is in a rearward inclined posture along the handle frame 9 from the upper side of the battery mounting portion 23 toward the lower battery mounting portion 23 while being brought into contact with the cam surface 24E of the fixture 24 along the handle frame 9. By moving, the heavy battery 5 can be inserted and attached to the battery mounting portion 23 without the need to swing the fixture 24 from the operating position to the retracted position. The connector 5A can be connected to the connector 19 of the battery support 7A.

  Conversely, when the battery 5 is removed from the battery mounting portion 23, the operation portion 24C of the fixture 24 is swung backward against the action of the urging means 26 to engage the upper surface of the battery 5 with the engagement portion 24B. In the state where the engagement of the battery 5 is released, the grip 5B of the battery 5 is gripped and the battery 5 is pulled up rearward and upward along the handle frame 9, thereby connecting the connector 5A at the bottom of the battery and the connector 19 of the battery support 7A. Can be released, and the battery 5 can be removed from the battery mounting portion 23 and removed.

  That is, the battery 5 can be easily attached to and detached from the battery mounting portion 23 by inserting / removing the battery 5 along the handle frame 9 with respect to the recess 15 </ b> B (the peripheral wall portion 15 </ b> Bb) of the cover body 15.

  In addition, since the grip portion 5B of the battery 5 is provided at the front upper portion of the battery 5, the posture of the battery 5 is inclined backward with the weight balance at that time when the grip portion 5B of the battery 5 is gripped and the battery 5 is lifted. Since it is in the posture, it becomes easy to insert and remove the battery 5 along the handle frame 9 in the rearward inclined posture, and the battery 5 can be attached to and detached from the battery mounting portion 23 more easily.

  In a state where the battery 5 is attached to the battery mounting portion 23, the urging means 26 causes the fixture 24 to swing back from the retracted position to the operating position with the support shaft 25 facing left and right as a fulcrum. By engaging with the upper surface, it is avoided that the battery 5 is lifted from the battery mounting portion 23 due to vibration or the like during work and the connection between the connector 5A at the bottom of the battery and the connector 19 at the battery support portion 7A is released. It is possible to prevent unexpected operation stop due to the disconnection.

  Further, the battery 5 attached to the battery mounting portion 23 is in a rearward inclined posture along the handle frame 9, and the indicator 5 </ b> C provided at the rear right side portion on the upper surface of the battery 5 is blocked by the grip portion 5 </ b> B and the fixture 24. Since it faces the rear upper side instead, it is possible to improve the visibility when the operator who steers the aircraft from the rear visually recognizes the display of the indicator 5C.

  Further, the cover body 15 and the cover body 15 are placed in a rear inclined posture along the handle frame 9 on the rear side of the body frame 1 away from the heavy electric motor 4 provided on the front side of the body frame 1. The battery can be mounted on the battery mounting portion 23 in a stable state across the main frame 7 and the handle frame 9 via the fixture 24. Thus, when the heavy electric motor 4 and the battery 5 are mounted on the front side of the body frame 1 without providing a dedicated support member for mounting the battery 5 in a stable state on the body frame 1. Compared to the above, the front-rear balance of the aircraft can be improved, and the maneuverability of the aircraft can be improved.

  In addition, the battery 5 is covered with the upper cover portion 3 </ b> B (cover body 15) of the rotor cover 3 at the position immediately before the handle frame 9 in the main frame 7 in a rearward inclined posture along the handle frame 9. Therefore, it is possible to equip the bulky battery 5 with the rotor cover 3 and the handle frame 9 on the rear side of the fuselage frame 1 in an inconspicuous state, thereby making the entire fuselage compact. The appearance of the aircraft can be improved.

  As shown in FIGS. 4 and 8, a pair of left and right engaging recesses 5 </ b> D that are recessed toward the inner side of the battery 5 are formed on the lower side portions of the front wall and the rear wall of the battery 5 from the bottom surface of the battery 5. It is formed upward. Further, in the state where the battery 5 is attached to the battery mounting portion 23 on the lower side of the front wall portion and the rear wall portion of the peripheral wall portion 15Bb in the concave portion 15B of the cover body 15 constituting the battery mounting portion 23, The pair of left and right protrusions 15Bd that prevent the displacement of the battery 5 in the left-right direction and the front-rear direction with respect to the recess 15B of the cover body 15 by engaging with the engaging recess 5D that protrudes to the inside of the recess 15B. It is formed. Thus, the connection between the connector 5A at the bottom of the battery and the connector 19 of the battery support 7A accompanying the attachment of the battery 5 to the battery mounting portion 23 can be performed more reliably and easily.

  As shown in FIGS. 1 to 4, 6, 7, and 12, the support member 10 that forms the rear part of the body frame 1 is made of a sheet metal that is bent in an inverted U shape when viewed in the front-rear direction, and is disposed at the upper part thereafter. A swing arm 28 that swings up and down behind the left and right tillage rotors 1 is provided with the left and right support shaft 27 as a fulcrum.

  The swing arm 28 is welded so that a pair of left and right arm members 28A formed in the shape of a side view are opposed to each other via a support member 28B made of a round pipe steel material set in a posture orthogonal to the rear side thereof. Configured. The swing start end of the swing arm 28 is directed left and right with respect to the support member 10 in a state where the front end portions of the left and right arm members 28A forming the swing start end of the swing arm 28 are located laterally outside the support member 10. Are connected via a support shaft 27.

  At one end of the left and right arm members 28A forming the free end portion of the swing arm 28, the swing arm 28 is swung downward and moved downward (the solid line in FIG. 1 and the posture shown in FIGS. 2 to 4). It is equipped with a moving wheel 29 to be grounded. As an example of the backward swing posture, the support member 28B has a resistance rod 30 as a resistor that is grounded in a rearward posture (posture indicated by a two-dot chain line in FIG. 1). The pin is connected so that it can be adjusted. And the fixing means 31 which enables fixation in the downward attitude | position of the rocking | swiveling arm 28 and a back-facing attitude | position across the support member 10 and the rocking | swiveling start end part of the rocking | swiveling arm 28 is equipped.

  The fixing means 31 is an L-shaped lock pin 32 that is equipped in a state in which a sliding operation in the left-right direction can be performed laterally outside the front end portion of the right arm member 28A as the swinging arm 28 swings. However, the moving wheel is inserted into the first engagement hole 10A formed on the front side of the support member 10 by the action of the urging means 33 formed of a compression spring that urges the lock pin 32 to slide leftward. The swing arm 28 is fixed in a downward posture in which the ground 29 is in contact with the ground, and is also inserted in a second engagement hole 10B formed on the rear side of the support member 10 so that the swing arm is in a backward posture in which the resistance bar 30 is grounded. 28 is fixed. Then, the lock pin 32 is slid rightward against the action of the biasing means 33 to release the insertion of the lock pin 32 into the first engagement hole 10A or the second engagement hole 10B. The swing arm 28 is configured to be able to be released from being fixed in the downward posture or the backward posture.

  In the state in which the swing arm 28 is fixed in the downward posture by the fixing means 31 from the above configuration, the lock pin 32 is slid rightward against the action of the biasing means 33 to perform the first engagement. After being extracted from the hole 10A, the swing arm 28 is swung backward and the lock pin 32 is inserted into the second engagement hole 10B by the action of the biasing means 33, so that the swing arm 28 is in a backward posture. It can be fixed and can be easily switched and held in a working state in which the resistance bar 30 is grounded. On the contrary, in a state where the swinging arm 28 is fixed in the backward posture by the fixing means 31, the lock pin 32 is slid rightward against the action of the urging means 33, and the second engagement hole 10B. Then, the swing arm 28 is swung forward and the lock pin 32 is inserted into the first engagement hole 10A by the action of the biasing means 33, so that the swing arm 28 is fixed in a downward posture. Therefore, it can be easily switched and held in a moving state in which the moving wheel 29 is grounded.

  In the moving state, the moving wheel 29 and the resistance rod 30 are displaced to the front side of the aircraft more than in the working state, and away from the operator's feet maneuvering the aircraft from the rear. Since the operator's foot space when moving the machine body is widened, it is possible to prevent the moving wheel 29 and the resistance rod 30 from interfering in the moving operation of the machine body using the moving wheel 29.

  As shown in FIGS. 1-4, the resistance rod 30 is comprised with the round bar steel material bent-formed in the shape of a letter. In the downward posture of the swing arm 28, the connecting portion 30A with respect to the support member 28B on one end side is in the front-rear posture above the moving wheel 29, and the grounding portion 30B on the other end side moves. The end of the grounding portion 30B is positioned at the lowest point of the rotation locus of the tilling rotor 2 in a state in which the posture of the grounding portion 30B is positioned between the left and right tilling rotors 2 It is comprised so that it may be located between the bottom parts of the transmission case 8. FIG. In the backward posture of the swing arm 28, the connecting portion 30 </ b> A is in a vertical posture in front of the moving wheel 29, and the grounding portion 30 </ b> B is in a forward tilting posture below the moving wheel 29, The end side of 30 </ b> B is grounded so that the grounding state (ground penetration depth) of the resistance rod 30 can be adjusted by the vertical operation of the steering handle 6.

  In the moving state in which the swing arm 28 is fixed in the downward posture and the moving wheel 29 is grounded, the resistance rod 30 is extended from the upper side of the moving wheel 29 toward the front of the moving wheel 29. The grounding portion 30B of the resistance rod 30 is located between the left and right tilling rotors 2 in a state where it is located between the lowest point of the rotation locus of the tilling rotor 2 in front of the moving wheel 29 and the bottom of the transmission case 8. Can fit in.

  Thereby, when the resistance rod 30 is configured to extend toward the rear steering position in the moving state, it extends toward the rear at the time of the moving operation of the airframe using the moving wheel 29, which may be caused. Generation | occurrence | production of the malfunction that the resistance rod 30 is located in a worker's foot etc. which walks in a control position, and obstructs a worker's walk etc. can be avoided beforehand.

  In addition, while the resistance rod 30 is extended in front of the moving wheel 29 in the moving state, the left and right tilling rotors 2 are kept in a floating state so as not to contact the ground when the moving wheel 29 is used to move the machine body. As a result, the resistance rod 30 also rises and does not come into contact with the ground, so that the resistance rod 30 is grounded during the movement operation of the aircraft using the moving wheel 29, thereby making it difficult to cause the movement of the aircraft. Can do.

  In addition, the space between the lowest point of the rotation trajectory of the tilling rotor 2 and the bottom of the transmission case 8 is effectively used as a storage space for the resistance rod 30 between the left and right tilling rotors 2 positioned in front of the moving wheel 29. Thus, while the resistance rod 30 is positioned in front of the moving wheel 29 in the moving state, the position of the moving wheel 29 in the moving state can be set to a position close to the left and right tillage rotors 2. Since the moving wheel 29 in the moving state can be made to enter the battery mounting portion 23 on the rear side of the fuselage in the lower side of the battery 5 mounted in the rear inclined posture along the handle frame 9, the moving wheel 29 at the time of the moving operation can be It is possible to facilitate the lifting operation of the left and right tilling rotors 2 as fulcrums.

  On the other hand, in the working state in which the swinging arm 28 is fixed in the backward posture and the resistance rod 30 is grounded, the grounding portion 30B of the resistance rod 30 is grounded in the forward tilting posture so that the grounding point of the resistance rod 30 is left and right tilled. It is possible to set the position further away from the rotor 2, thereby adjusting the grounding state (depth of ground penetration) of the resistance rod 30 by the vertical operation of the steering handle 6 with the left and right tilling rotors 2 as fulcrums. Since it is easy to perform, and it becomes easy to change the movement resistance by adjusting the ground contact state, it is possible to easily and satisfactorily adjust the moving speed of the airframe that is moved by driving the tilling rotor 2 by operating the steering handle 6 up and down. it can.

  That is, in the moving state, the body using the moving wheel 29 can be easily and satisfactorily moved. Further, in the working state, the moving speed adjustment using the resistance rod 30 can be easily and satisfactorily performed, and the tilling depth adjustment by adjusting the moving speed can be easily and satisfactorily performed.

  As shown in FIG. 1, in this walking type electric working machine, the grounding height position of the moving wheel 29 to be grounded in the downward posture of the swing arm 28 is grounded by the resistance rod 30 that is grounded in the backward posture of the swing arm 28. It is comprised so that it may become lower than a height position. That is, the body height in the moving state with the moving wheel 29 grounded is higher than the body height in the working state in which the resistance rod 30 is grounded, and the height position of the steering handle 6 in the moving state is the working state. It is comprised so that it may become higher than the height position of the steering handle 6 in. Therefore, in a state where the steering handle 6 is located at the same height position, the height position of the left and right tillage rotors 2 in the moving state is higher than the height position of the left and right tillage rotors 2 in the working state, and the grounding is performed. This makes it difficult to cause the possibility that the right and left tilling rotors 2 may come into contact with the ground or the like during the moving operation of the airframe using the moving wheels 29 and hinder the movement of the airframe.

  As shown in FIGS. 1 to 3, 5, and 9, the walking type electric working machine can be attached and detached with a resin storage box 34 that is an open top type that stores the left and right tillage rotors 2 from below. In preparation. At the bottom of the storage box 34, a support base 34A that is positioned between the left and right tilling rotors 2 and receives and supports the bottom of the transmission case 8 from below is formed to bulge upward. The upper side of the left and right side portions of the storage box 34 is engaged with the engagement recesses 15C formed at the left and right ends of the cover body 15 (upper cover portion 3B) of the rotor cover 3 and between the support base 34A. A buckle-type fixture that fixes the storage box 34 to the lower part of the walking type electric working machine in a state where the left and right tilling rotors 2 are covered from below by sandwiching a portion extending from the transmission case 8 to the cover body 15 of the walking type electric working machine. 35 is equipped. At the rear of the storage box 34, there is a notch 34 </ b> B that allows the grounding portion 30 </ b> B of the resistance bar 30 positioned between the left and right tilling rotors 2 to be stored in the storage box with the swing arm 28 facing downward. The storage box 34 has a width substantially the same as the left and right width, and is recessed downward from the upper end of the storage box 34 to a predetermined height position that allows the resistance bar 30 to be stored in the storage box.

  In other words, by attaching the storage box 34 to the airframe with the swing arm 28 changed to the downward posture, the resistance wheel 30 together with the left and right tilling rotors 2 is exposed while the moving wheel 29 is exposed outside the storage box. Can be stored in the storage box. As a result, when moving the aircraft using the moving wheel 29, the storage box 34 is attached so that the left and right tilling rotors 2 and the grounding portion 30B of the resistance rod 30 come into contact with the ground or the like, thereby hindering the movement of the aircraft. It is possible to avoid the possibility of coming to the front.

  Then, when the steering handle 6 is changed to the retracted posture after the movement and loaded into the trunk of the vehicle, the right and left tilling rotors 2 and the grounding portion 30B of the resistance bar 30 are connected to the vehicle by the storage box 34 attached to the airframe. It is possible to prevent direct contact with the trunk and the like, and dirt attached to the left and right tilling rotors 2 and the grounding portion 30B of the resistance rod 30 to be peeled off into the trunk of the automobile. Thereby, when carrying a walking type electric working machine using a motor vehicle etc., the trunk etc. where the walking type electric working machine is loaded are in contact with the left and right tilling rotors 2 and the grounding part 30B of the resistance bar 30. It is possible to prevent the inconvenience of being damaged due to the soil and the inconvenience of soiling due to the soil and the like adhering to the grounding portion 30B of the right and left tilling rotors 2 and the resistance rod 30 being peeled off.

  As shown in FIGS. 1 to 5 and 9, the front of the transmission case 8 is made of a round pipe steel material that extends forward in a loop shape that can be used as a grip portion when carrying a walking electric work machine. The guard 36 is bolted. Thereby, carrying around of a walk type electric working machine can be made easy.

  As shown in FIGS. 1 to 3, in this walking type electric working machine, in a moving state in which the swinging arm 28 is changed to a downward posture and the moving wheel 29 is grounded, the moving wheel 29 and the resistance rod 30 are attached to the steering handle 6. It is configured so as to be positioned on the front side of the machine body with respect to the bolt 12 that also serves as a swing fulcrum shaft. As a result, the front and rear length in the retracted state of the airframe in which the swing arm 28 is changed to the downward posture and the steering handle 6 is changed to the retracted posture is changed from the front end of the front guard 36 to the rear end of the handle frame 9. The length can be shortened and it can be easily loaded on the trunk of an automobile.

    [Another embodiment]

[1] The walking electric work machine includes a main frame 7 that is formed in an inverted U shape when viewed in the front-rear direction, without integrally forming a pair of left and right front connecting arm portions 7B and 7C. The main frame 7 is arranged between the lower cover part 3A and the upper cover part 3B by covering the frame 7 with the lower cover part 3A from below and the upper cover part 3B from above. There may be.

[2] In the above embodiment, the lower cover portion 3A is exemplified by a pair of left and right cover members 14, but the lower cover portion 3A may be constituted by a single cover member. Alternatively, it may be composed of three or more cover members.

[3] The lower cover portion 3A may be a cover member made of resin other than sheet metal.

[4] Even if the upper cover portion 3B is not equipped with the motor cover 20 that covers the upper side of the electric motor 4 exposed upward from the opening 15A of the cover body 15 constituting the upper cover portion 3B. Good.

[5] The main frame 7 may be configured to include a battery support portion 7A having a rectangular shape in plan view on the upper surface thereof.

  The present invention can be applied to a walking electric work machine including an electric motor that drives a tilling rotor and a battery that supplies power to the electric motor.

2 Tillage rotor 3 Rotor cover 3A Lower cover 3B Upper cover 4 Electric motor 5 Battery 7 Main frame 18 Electric wire

Claims (2)

The rotor cover that covers the top of the tillage rotor deployed in the lower part of the fuselage is configured in a double structure comprising a lower cover part and an upper cover part spaced apart vertically,
A state in which the electric motor that drives the tilling rotor and the battery that supplies power to the electric motor are exposed above the lower cover portion and the upper sides of the electric motor and the battery protrude upward from the upper cover portion. Deploy with
A walking electric work machine in which an electric wire connecting the electric motor and the battery is passed between the lower cover part and the upper cover part.   The walking type electric working machine according to claim 1, wherein a main frame that supports the battery is disposed between the lower cover part and the upper cover part.

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