JP5394353B2 - Electric construction machine - Google Patents

Description

  The present invention relates to an electric construction machine such as a hydraulic excavator and a wheel loader provided with an electric motor as a power source.

  Generally, a construction machine such as a hydraulic excavator used for excavation work or dismantling work is driven by a hydraulic pump driven by an engine, so that a traveling hydraulic motor, a turning hydraulic motor, various hydraulic cylinders constituting a working device, etc. The hydraulic oil for operation (hydraulic oil) is supplied to the hydraulic actuator.

  On the other hand, when performing excavation work or dismantling work in a building such as a warehouse, as a power source for driving a hydraulic pump in place of the engine in order to prevent the working environment from being lowered by exhaust gas from the engine There has been proposed an electric hydraulic excavator provided with an electric motor and a battery for supplying power to the electric motor.

  By the way, in an electric hydraulic excavator, it is necessary to mount many batteries so that it can operate for a long time. For this reason, when a large number of batteries are mounted on a small hydraulic excavator called a mini excavator, usually, a battery storage structure in which a large number of batteries are efficiently mounted on the rear side of the vehicle body frame serving as the base of the upper swing body. A (battery table) is attached, and a large number of these batteries are also used as counterweights (see, for example, Patent Document 1).

JP 2008-44408 A

  By the way, it is known that the performance of each battery mounted on the battery housing structure deteriorates due to vibrations generated during the operation of the hydraulic excavator. For this reason, a plurality of elastic support members such as rubber mounts that elastically support the battery storage structure are usually provided between the vehicle body frame and the battery storage structure. By absorbing the vibration transmitted from the frame to the battery housing structure, the transmission of vibration to each battery is suppressed.

  However, if each elastic support member is elastically deformed by vibration during operation of the hydraulic excavator, the battery housing structure moves forward, rearward, leftward, rightward (horizontal direction) with respect to the vehicle body frame. There is a possibility that the battery housing structure or the battery mounted on the battery housing structure may interfere with the body frame or the mounted device mounted on the body frame. For this reason, it is necessary to ensure sufficient space around the battery storage structure, and as a result, there is a problem that the amount of battery mounted on the battery storage structure is reduced.

  When the excavator is operated, for example, when the turning operation of the upper turning body is stopped, the heavy battery table swings in the turning direction or swings back according to the elastic deformation of the elastic support member. There is a problem that behavior (turning jerking) occurs and the operability of the hydraulic excavator by the operator is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and can stably support the battery storage structure even when the elastic support member is elastically deformed, and the amount of the battery mounted on the battery storage structure is increased. An object of the present invention is to provide an electric construction machine that can be used.

  In order to solve the above-described problems, the present invention is applied to an electric construction machine in which a battery is mounted on a rear portion of a vehicle body frame and an electric motor is driven by the battery.

  The feature of the configuration adopted by the invention of claim 1 is that the body frame has a front frame on which a working device is provided on the front side and the electric motor is mounted, and a frame-like base frame portion. And a rear frame provided on the rear side of the front frame. The rear frame is provided with a plurality of elastic support members around the base frame portion, and the rear frame is provided with the base frame portion. A battery housing structure is provided that has a frame-like battery mounting base that is arranged on the inner side with a gap over the entire circumference and elastically supported by the elastic support members, and that mounts the battery. Either one or both of the inner surface of the base frame portion constituting the battery and the outer surface of the battery mounting base constituting the battery housing structure are provided with the elastic member. The battery mounting base is allowed to move upward and downward relative to the rear frame by elastic deformation of the support member, and is restricted from moving forward, backward, left and right with respect to the rear frame. A slide plate is provided.

  The invention according to claim 2 is that the inner surface of the base frame portion constituting the rear frame and the outer surface of the battery mounting base constituting the battery housing structure face each other in the front, rear direction, left and right directions over the entire circumference. The slide plate includes a front slide plate disposed between the base frame portion and the battery mounting base on the front side in the front and rear directions, and the base frame portion and the battery on the rear side in the front and rear directions. A rear slide plate disposed between the mounting base, a left slide plate disposed between the base frame portion and the battery mounting base on the left side in the left and right directions, and the base on the right side in the left and right directions. That is, the right slide plate is arranged between the frame portion and the battery mounting base.

  According to a third aspect of the present invention, there is provided a stopper for restricting an upward and downward movement amount of the battery mount relative to the rear frame between the base frame portion of the rear frame and the battery mount of the battery housing structure. It is in the structure which provides a member.

  According to a fourth aspect of the present invention, a support column extending upward and downward is provided on a rear end side of the rear frame, and the battery storage structure is provided with the battery mounting base elastically supported by the elastic support members. The battery mounting table is arranged on the battery mounting base, and a connecting mechanism is provided between the support column and the battery table for connecting the two.

  According to a fifth aspect of the present invention, the connecting mechanism is configured to allow movement in the upper and lower directions of the battery table relative to the support column and restrict movement in the front, rear, left, and right directions.

  According to a sixth aspect of the present invention, the connecting mechanism includes a frame side bracket fixed to the support column, a table side bracket fixed to the battery table, and one end side of the frame side bracket upward and downward with a pin as a center. The other end side is constituted by a link connected to the table side bracket so as to be swingable upward and downward about the pin.

  According to a seventh aspect of the present invention, the frame side bracket is constituted by a pair of bracket bodies arranged at intervals in the left and right directions, and the table side bracket is constituted by a pair of bracket bodies arranged at intervals in the left and right directions. And the link includes a frame-side boss cylinder having a length corresponding to a distance between left and right bracket bodies constituting the frame-side bracket, and a pin inserted through an inner peripheral side, and the table side A table-side boss cylinder having a length corresponding to the distance between the left and right bracket bodies constituting the bracket and having a pin inserted through the inner periphery thereof; and the frame-side boss cylinder and the table-side boss cylinder; And a connecting body that connects the two.

  The invention according to claim 8 is characterized in that, in the slide plate, a virtual line connecting the front slide plate disposed between the front end side of the base frame portion and the front end side of the battery mounting base and the connection mechanism is a connection line. Then, it was set as the structure which sets the height position of the said connection mechanism so that the gravity center position when the said battery is mounted in the said battery table may be located on the said connection line, or located below the said connection line. It is in.

  According to a ninth aspect of the present invention, the coupling mechanism includes a ring member that is fixed to one member of the support column and the battery table and has a shaft insertion hole that penetrates upward and downward, the support column, and the battery table. The shaft member is fixed to the other member and is inserted into the shaft insertion hole of the ring member so as to be movable upward and downward.

  According to the first aspect of the present invention, the vibration transmitted from the rear frame to the battery housing structure due to the elastic deformation of the elastic support member provided between the base frame portion of the rear frame and the battery mounting base of the battery housing structure. Can be absorbed. In this case, since the slide plate is provided between the base frame portion of the rear frame and the battery mounting base disposed inside the base frame portion, the battery is provided when the elastic support member undergoes elastic deformation. The slide plate can restrict the mounting base from moving forward, rearward, leftward, and rightward with respect to the rear frame. As a result, the battery storage structure moves exclusively upward and downward, and does not move greatly forward, backward, left, and right, so the battery storage structure can be stably placed on the rear frame. Can be supported.

  As a result, the amount of battery mounted on the battery storage structure can be increased, and the continuous operation time of the electric construction machine can be extended. Further, by restricting the movement of the battery storage structure in which the battery is mounted in the front, rearward, left, and right directions, for example, when the turning operation of the body frame is stopped, the battery storage structure is shaken and returned. And the like, and the posture of the body frame can be stabilized, so that the operability of the electric construction machine can be improved.

  According to the invention of claim 2, by providing the front slide plate and the rear slide plate between the inner surface of the base frame portion and the outer surface of the battery mounting table, the movement of the battery mounting table in the front and rear directions is limited. In addition, by providing a left slide plate and a right slide plate between the inner surface of the base frame part and the outer surface of the battery mounting base, the movement of the battery mounting base in the left and right directions can be restricted, The battery housing structure can be stably supported.

  According to the invention of claim 3, even when the battery mounting base moves largely in the upward and downward directions due to the vibration of the rear frame, the amount of movement of the battery mounting base in the upward and downward directions with respect to the rear frame is limited by the stopper member. Can do. As a result, the elastic support member can be protected, and the battery storage structure can be stably supported over a long period of time by the elastic support member.

  According to the invention of claim 4, in addition to supporting the battery mounting base of the battery housing structure using the elastic support member for the base frame portion of the rear frame, the connection mechanism is used for the support of the rear frame. The battery table of the battery storage structure can be supported. Thereby, even in a state where a large number of batteries are mounted on the battery housing structure, the battery housing structure can be reliably supported.

  According to the invention of claim 5, in addition to restricting the movement of the battery mounting base in the front, rear direction, left and right directions by the slide plate, the connecting mechanism moves the front, rear direction, left and right directions of the battery table. Movement can be restricted. As a result, the battery housing structure in which a large number of batteries are mounted can be stably supported with respect to the rear frame.

  According to the invention of claim 6, when the elastic support member is elastically deformed by the vibration of the rear frame, the other end of the link pin-coupled to the table-side bracket with the one end side of the link pin-coupled to the frame-side bracket as a fulcrum. The side swings up and down in an arc. As a result, the battery table to which the table side bracket is fixed moves exclusively upward and downward, and can limit the movement of the battery table in the front, rear, left, and right directions.

  According to the invention of claim 7, by setting the frame side boss cylinder pin-coupled to the frame side bracket to a length dimension corresponding to the interval between the left and right bracket bodies constituting the frame side bracket, It is possible to regulate the backlash of the link with respect to the frame side bracket in the left and right directions. In addition, by setting the table side boss cylinder pin-coupled to the table side bracket to the length corresponding to the distance between the left and right bracket bodies constituting the table side bracket, the left side of the link to the table side bracket , Rattling in the right direction can be regulated.

  According to invention of Claim 8, it can connect between the support | pillar of a rear frame, and the battery table of a battery storage structure via a connection mechanism in the highest possible position. Thereby, while the movement direction of a battery mounting base is restrict | limited by a slide plate, the movement direction of the upper end side of a battery table can be restrict | limited by the link of a connection mechanism. As a result, by mounting a large number of batteries in the battery storage structure in the upward and downward directions, the battery storage structure is stably supported even when the center of gravity of the battery storage structure is increased. be able to.

  According to the ninth aspect of the present invention, when the elastic support member is elastically deformed by the vibration of the rear frame, the movement of the shaft body inserted through the shaft insertion hole of the ring member in the front, rear direction, left and right directions is restricted. The relative movement is made in the upward and downward directions. As a result, the battery table moves exclusively upward and downward, and the movement of the battery table in the front, rearward, leftward and rightward directions can be restricted.

1 is a front view showing an electric hydraulic excavator according to a first embodiment. It is the top view which looked at the hydraulic excavator from the upper part. It is the top view which looked at the upper revolving body from the upper part in the state which removed the exterior cover, the rear cover, and the canopy. It is a disassembled perspective view which shows the state which removed the rear vehicle body from the front vehicle body. It is a disassembled perspective view which shows a front part frame and a rear part frame. It is a perspective view which shows a front frame alone. It is a perspective view which shows a rear frame alone. It is a perspective view which shows the state which mounted the battery in the battery table. It is a disassembled perspective view which decomposes | disassembles and shows a battery mounting base and a battery table. It is a partially broken perspective view which shows the state which attached the battery mounting base to the base frame part of the rear frame. It is sectional drawing seen from the arrow XI-XI direction in FIG. 3 which shows a rear frame, a battery mounting base, a battery table, etc. in the state which abbreviate | omitted the battery. It is sectional drawing seen from the arrow XII-XII direction in FIG. 11 which shows the base frame part of a rear frame, a battery mounting base, each slide plate, etc. It is sectional drawing seen from the arrow XIII-XIII direction in FIG. 11 which shows a rear part frame, a battery mounting base, a stopper member, etc. It is a disassembled perspective view which shows the support | pillar of a rear frame, an upper stage table, and a connection mechanism. It is an expanded sectional view which expands and shows the connection mechanism in FIG. It is the top view which looked at the connection mechanism from the arrow XVI-XVI direction in FIG. It is an expanded sectional view which shows operation | movement of a connection mechanism when a battery table moves upwards. It is an expanded sectional view showing operation of a connection mechanism when a battery table moves below. It is a disassembled perspective view similar to FIG. 14 which shows the connection mechanism by 2nd Embodiment, the support | pillar of a rear frame, and an upper stage table. It is an expanded sectional view similar to FIG. 15 which shows the connection mechanism of 2nd Embodiment. It is an expanded sectional view which shows operation | movement of a connection mechanism when a battery table moves upwards. It is sectional drawing similar to FIG. 12 which shows arrangement | positioning of each slide plate by a 1st modification. It is sectional drawing similar to FIG. 12 which shows arrangement | positioning of each slide plate by a 2nd modification.

  Hereinafter, an embodiment of an electric construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the embodiment is applied to a hydraulic excavator.

  1 to 18 show an electric construction machine according to a first embodiment of the present invention.

  In the figure, reference numeral 1 denotes an electric excavator. The excavator 1 is mounted on a crawler-type lower traveling body 2 capable of self-propelling and is pivotably mounted on the lower traveling body 2, together with the lower traveling body 2. And an upper swing body 3 constituting a vehicle body. On the front side of the upper swing body 3 is provided a swing type work device 4 for performing excavation work of earth and sand. The work device 4 includes a swing post 4A, a boom 4B, an arm 4C, a bucket 4D, and a boom cylinder 4E. , Arm cylinder 4F, bucket cylinder 4G and the like.

  Here, as shown in FIG. 4, the upper-part turning body 3 according to the present embodiment includes a front vehicle body 5 positioned on the front side and a rear vehicle body 10 described later attached to the rear end side of the front vehicle body 5. It is comprised by.

  The front vehicle body 5 has a front frame 13 to be described later. On the left side of the front frame 13, a driver seat 6 on which an operator is seated and a canopy 6A that covers the driver seat 6 from above are arranged. Yes. Further, on the right side of the front frame 13, an electric motor 7, a hydraulic pump 8, a hydraulic oil tank 9, and the like are disposed, and the hydraulic pump 8 is driven by the electric motor 7, and is stored in the hydraulic oil tank 9. The hydraulic oil is supplied to hydraulic equipment such as hydraulic cylinder motors 4E, 4F, and 4G that constitute the working device 4 and hydraulic oil (not shown) for traveling and turning.

  Next, 10 indicates a rear vehicle body attached to the rear end side of the front vehicle body 5, and the rear vehicle body 10 constitutes the upper swing body 3 together with the front vehicle body 5.

  The rear vehicle body 10 has a rear frame 20 described later, and a plurality of batteries 29 are mounted on the rear frame 20 via a battery storage structure 28 described later. Each battery 29 supplies power to the electric motor 7.

  Reference numeral 11 denotes a turning frame as a body frame serving as a base of the upper swing body 3, and the turning frame 11 includes a front frame 13 and a rear body 10, which will be described later, which serve as a base of the front body 5, as shown in FIG. 5. It is comprised by connecting with the rear frame 20 mentioned later used as the base of this using the connection pin 12 grade | etc.,. That is, the turning frame 11 according to the present embodiment is configured by integrally connecting the front frame 13 and the rear frame 20 formed as separate members.

  Next, the front frame 13 constituting the front side of the turning frame 11 will be described. The front frame 13 serves as a base of the front vehicle body 5 and is mounted with the driver's seat 6, the canopy 6A, the electric motor 7, the hydraulic pump 8, the hydraulic oil tank 9, and the like described above.

  Here, as shown in FIG. 6, the front frame 13 is formed using a thick steel plate or the like, and extends in the front and rear directions. The front frame 13 is erected on the upper surface side of the bottom plate 14 and left and right. The left vertical plate 15 and the right vertical plate 16 extending in the front and rear directions while facing each other, and the left and right bottom plates 14 and 17A are disposed on the left side of the bottom plate 14 and the left vertical plate 15 and extend in the front and rear directions. The left side frame 17 and the right side frame 18 which is disposed on the right side of the bottom plate 14 and the right vertical plate 16 via the right overhanging beam 18A and extends in the front and rear directions are roughly configured.

  A stepped cylindrical swing bracket 19 is fixed to the front end side of the left vertical plate 15 and the right vertical plate 16, and the swing post 4 </ b> A of the work device 4 is swingably supported by the swing bracket 19. . A pin insertion hole 15A penetrating left and right is provided on the rear end side of the left vertical plate 15, and a pin insertion hole 16A penetrating left and right is provided on the rear end side of the right vertical plate 16. The connection pin 12 is inserted into each of the pin insertion holes 15A and 16A.

  Next, the rear frame 20 constituting the rear side of the turning frame 11 will be described. The rear frame 20 serves as a base of the rear vehicle body 10, and as shown in FIG. 7, a base frame portion 21, an outer peripheral frame portion 22, left and right columns 23 and 24, and a guard pipe 26, which will be described later. And is roughly composed. The rear frame 20 is detachably attached to the rear end side of the front frame 13 using the connecting pins 12 and the like, and supports a battery housing structure 28 described later.

  Reference numeral 21 denotes a base frame portion that serves as a base of the rear frame 20. The base frame portion 21 includes a rectangular front plate 21A extending in the left and right directions, and a rear plate facing the front plate 21A in the front and rear directions. 21B, the left side plate 21C and the right side plate 21D facing in the left and right directions across the front plate 21A and the rear plate 21B, and the lower end side of the front plate 21A, the rear plate 21B, the left side plate 21C, and the right side plate 21D. The closed bottom plate 21E is formed into a rectangular frame extending in the front and rear directions as a whole.

  The upper side of the left side plate 21C is a left horizontal flange plate 21F that is bent horizontally in the opposite direction to the right side plate 21D, and each elastic support member 27 described later is attached to the upper surface side of the left horizontal flange plate 21F. A mounting plate 21F1 is fixed. On the other hand, the upper end side of the right side plate 21D is a right horizontal flange plate 21G that is bent horizontally in the direction opposite to the left side plate 21C, and the mounting plate 21G1 is also fixed to the upper surface side of the right horizontal flange plate 21G. .

  Further, a pin insertion hole 21H penetrating left and right is provided on the rear end side of the left side plate 21C, and a pin insertion hole 21J penetrating left and right is provided also on the rear end side of the right side plate 21D. The pin insertion holes 21H and 21J are configured to insert the connecting pin 12. Further, a slide plate 35 described later is attached to the inner surface 21K of the base frame portion 21 including the front plate 21A, the rear plate 21B, the left side plate 21C, and the right side plate 21D.

  Reference numeral 22 denotes an outer peripheral frame portion provided on the rear end side of the base frame portion 21, and the outer peripheral frame portion 22 is formed in an arc shape centered on the turning center of the upper turning body 3, for example. Here, as shown in FIG. 7, the outer peripheral frame portion 22 includes an outer surface plate 22A that is curved in an arc shape while facing the rear surface plate 21B of the base frame portion 21, and the rear surface side of the left side surface plate 21C and the right side surface plate 21D. The bottom plate 22B extends from the lower end side of the outer surface plate 22A to the base frame portion 21 side and is fixed to the rear surface plate 21B, the left side surface plate 21C, and the right side surface plate 21D of the base frame portion 21 by means such as welding. ing.

  Reference numeral 23 denotes a left column provided on the rear end side of the rear frame 20, and the left column 23 is disposed on the rear side of the left side plate 21 </ b> C constituting the base frame unit 21. The left support 23 is formed of a hollow rectangular tube having a quadrangular cross section and is welded to the rear end portion of the base frame portion 21 and the bottom plate 22B of the outer peripheral frame portion 22 so as to extend upward and downward. Yes.

  Reference numeral 24 denotes a right column provided on the rear end side of the rear frame 20 in a pair with the left column 23, and the right column 24 is disposed on the rear side of the right side plate 21 </ b> D constituting the base frame unit 21. . The right support 24 is also formed of a hollow rectangular tube having a square cross section, and is extended upward and downward by being welded to the rear end portion of the base frame portion 21 and the bottom plate 22B of the outer peripheral frame portion 22 and the like. . The upper end side of the left column 23 and the upper end side of the right column 24 are connected by a connecting beam 25 having an L-shaped cross section, and the left column 23 and the right column 24 are integrated via the connecting beam 25. Has been.

  Reference numeral 26 denotes a guard pipe extending forward from the left and right support columns 23 and 24 along the outer peripheral frame portion 22, and the guard pipe 26 is formed by using, for example, a hollow round pipe material. The guard pipe 26 is curved along the outer peripheral frame portion 22 while being curved along the outer peripheral frame portion 22 and the left guard portion 26 </ b> A bridged between the left end side of the outer peripheral frame portion 22 and the left column 23. On the other hand, it is constituted by a right guard portion 26 </ b> B bridged between the right end side of the outer peripheral frame portion 22 and the right column 24. As shown in FIG. 3, the guard pipe 26 protects each of the batteries 29 by surrounding a large number of batteries 29 mounted on a battery housing structure 28 described later from the outside.

  Then, as shown in FIG. 5, the base frame portion 21 of the rear frame 20 is moved from the left and right directions by the rear end side of the left vertical plate 15 and the rear end side of the right vertical plate 16 constituting the front frame 13. The pin 12 is inserted into the pin insertion hole 15A of the left vertical plate 15 and the pin insertion hole 21H of the left side plate 21C constituting the base frame portion 21, and the pin insertion hole 16A of the right vertical plate 16 and the base frame are inserted. A revolving frame by fastening the front frame 13 and the rear frame 20 with bolts or the like (not shown) in a state where the connecting pin 12 is inserted into the pin insertion hole 21J of the right side plate 21D constituting the portion 21. 11 is formed.

  Next, reference numeral 27 denotes a plurality of elastic support members (mount members) provided around the base frame portion 21 constituting the rear frame 20. Each of these elastic support members 27 elastically supports a later-described battery mounting base 30 with respect to the base frame portion 21. Here, the elastic support member 27 is formed in a cylindrical shape by an elastic body such as rubber, and a mounting bolt 27 </ b> A projects from the upper end side thereof. A plurality of elastic support members 27 (for example, four) are provided on the mounting plate 21F1 of the left horizontal flange plate 21F constituting the base frame portion 21 with a distance in the front and rear directions, and the right horizontal flange plate 21G. A plurality (for example, four) are provided on the mounting plate 21G1 at intervals in the front and rear directions.

  Next, the battery housing structure attached to the base frame portion 21 of the rear frame 20 will be described.

  Reference numeral 28 denotes a battery storage structure elastically supported on the base frame portion 21 of the rear frame 20 via each elastic support member 27. The battery storage structure 28 efficiently stores a large number of batteries 29. It is attached to the rear frame 20 in a state. Here, as shown in FIG. 9, the battery housing structure 28 includes a battery mounting base 30 and a battery table 31 which will be described later.

  Reference numeral 30 denotes a battery mounting base serving as a base of the battery housing structure 28, and the battery mounting base 30 is elastically supported on the base frame portion 21 of the rear frame 20 via each elastic support member 27. . The battery mounting base 30 includes a rectangular front plate 30A extending in the left and right directions, a rear plate 30B facing the front plate 30A in the front and rear directions, and a front plate 30A and a rear plate 30B on the left. The left side plate 30C, the right side plate 30D, and the bottom plate 30E facing in the right direction are formed into a rectangular frame that is slightly smaller than the base frame portion 21 of the rear frame 20 as a whole, and a plurality of pieces are formed on the bottom plate 30E. The battery 29 is mounted.

  The upper side of the left side plate 30C is the left horizontal flange plate 30F facing the left horizontal flange plate 21F of the base frame portion 21 in the upward and downward directions, and the upper end side of the right side plate 30D is the right horizontal flange plate of the base frame portion 21. It is a right horizontal flange plate 30G that faces 21G in the upward and downward directions. The left horizontal flange plate 30F has four bolt insertion holes 30F1 through which the mounting bolts 27A of the elastic support member 27 are inserted, and one spacer insertion hole 30F2 through which a spacer 36A of the left stopper member 36 described later is inserted. However, it is drilled at intervals in the front and rear directions. Similarly to the left horizontal flange plate 30F, the right horizontal flange plate 30G is also provided with four bolt insertion holes 30G1 and one spacer insertion hole 30G2 with an interval in the front and rear directions.

  As shown in FIG. 10, the battery mounting base 30 is disposed inside the base frame portion 21, and the mounting bolts 27A of the respective elastic support members 27 provided on the left horizontal flange plate 21F of the base frame portion 21 are mounted on the battery. The bolts are inserted into bolt insertion holes 30F1 provided on the left horizontal flange plate 30F of the base 30 and tightened with nuts, and the mounting bolts 27A of the respective elastic support members 27 provided on the right horizontal flange plate 21G of the base frame portion 21 are mounted on the battery. The bolt 30 is inserted into a bolt insertion hole 30G1 provided in the right horizontal flange plate 30G of the base 30 and tightened with a nut. As a result, the battery mounting base 30 is elastically supported by the base frame portion 21 via a plurality (eight in total) of elastic support members 27, and the base frame portion 21 is within a range in which each elastic support member 27 is elastically deformed. In contrast, it can be moved upward and downward.

  Next, reference numeral 31 denotes a battery table mounted on the battery mounting base 30. The battery table 31 includes a lower table 32, an intermediate table 33, and an upper table 34, which will be described later. A large number of batteries 29 can be held by the respective tables 32, 33, and 34 constituting the battery table 31 (see FIG. 8).

  Reference numeral 32 denotes a lower table detachably mounted on the battery mounting base 30. As shown in FIG. 9, the lower table 32 has a lower frame member 32A as a base formed in a frame shape using a square pipe or the like, and a central portion in the left and right directions of the lower frame member 32A. , A rearwardly extending central plate 32B, a left side plate 32C disposed on the left side of the lower frame member 32A, a right side plate 32D disposed on the rear right side of the lower frame member 32A, and a rear side of the lower frame member 32A The upper frame member 32E having a rectangular frame shape standing upright is roughly configured.

  The lower table 32 is fixed on the battery mounting base 30 by fastening the lower frame member 32A on the battery mounting base 30 using a bolt or the like, and is placed on the center plate 32B, the left side plate 32C, and the right side plate 32D. Each has a configuration in which a plurality of batteries 29 are mounted.

  Reference numeral 33 denotes a middle table, and the middle table 33 is detachably mounted on the lower table 32. The middle table 33 is also disposed on the left side of the lower frame member 33A, the lower frame member 33A formed in a frame shape using a square pipe, the center plate 33B disposed in the center of the lower frame member 33A, and the lower frame member 33A. The left side plate 33C, the right side plate 33D disposed on the right side of the rear portion of the lower frame member 33A, and the upper frame member 33E standing on the rear side of the lower frame member 33A are roughly configured. Also, a plurality of downward mounting legs 33F project downward on the front end side of the lower framework member 33A, and upward mounting legs 33G project upward on both left and right ends of the lower framework member 33A. Has been.

  In the middle table 33, the lower frame member 33A is placed on the upper frame member 32E of the first lower table 32, and the lower end of the downward mounting leg 33F is bolted to the lower frame member 32A of the lower table 32. Are fixed on the lower table 32, and a plurality of batteries 29 are mounted on the center plate 33B, the left side plate 33C, and the right side plate 33D, respectively.

  Reference numeral 34 denotes an upper table, and the upper table 34 is detachably mounted on the middle table 33. The upper table 34 is formed in a frame shape using a square pipe or the like, and extends to the left and right, a center plate 34B disposed in the center of the frame member 34A, and a left side of the frame member 34A. The left side plate 34C and the right side plate 34D arranged on the right side of the frame member 34A are roughly configured.

  The upper table 34 has the frame member 34A placed on the upper frame member 33E of the middle table 33, and both left and right ends of the frame member 34A are bolted to the upper mounting legs 33G of the middle table 33. Are fixed on the middle table 33, and a plurality of batteries 29 are mounted on the center plate 34B and the right side plate 34D, respectively. Further, a table side bracket 40 of a coupling mechanism 38 to be described later is attached to the center of the rear end portion of the frame member 34A (see FIG. 14).

  Next, a slide plate that restricts the movement of the battery mounting base 30 in the front, rearward, left, and right directions with respect to the rear frame 20 and the amount of movement of the battery mounting base 30 in the upward and downward directions with respect to the rear frame 20 A stopper member for limiting the above will be described.

  That is, 35 indicates a plurality of slide plates provided between the inner surface 21K of the base frame portion 21 of the rear frame 20 and the outer surface 30H of the battery mounting base 30, and each of the slide plates 35 is formed by the battery mounting base 30. It restricts movement in the forward, backward, left, and right directions. Here, as shown in FIGS. 11 and 12, each slide plate 35 is formed in a rectangular flat plate shape using, for example, a resin material and is bolted to the front plate 21 </ b> A of the base frame portion 21. Slide plate 35A, two rear slide plates 35B bolted to rear plate 21B, three left slide plates 35C bolted to left side plate 21C, and three bolted to right side plate 21D And a right slide plate 35D.

  In this case, between the front slide plate 35 </ b> A and the front plate 30 </ b> A of the battery mount 30, between the rear slide plate 35 </ b> B and the rear plate 30 </ b> B of the battery mount 30, the left slide plate 35 </ b> C and the left side plate 30 </ b> C of the battery mount 30. Between the right slide plate 35D and the right side plate 30D of the battery mounting base 30, appropriate gaps are formed.

  The slide plates 35A, 35B, 35C, and 35D are brought into contact with the outer surface 30H of the battery mount 30 when the elastic support member 27 that supports the battery mount 30 is elastically deformed on the base frame portion 21. Thus, the battery mounting base 30 is allowed to move upward and downward with respect to the base frame portion 21, and is restricted from moving forward, backward, left and right with respect to the base frame portion 21. It is.

  Reference numeral 36 denotes a left stopper member provided between the left horizontal flange plate 21F of the base frame portion 21 and the left horizontal flange plate 30F of the battery mounting base 30, and 37 denotes the right horizontal flange plate 21G of the base frame portion 21 and the battery. The right stopper member provided between the right horizontal flange plate 30G of the mounting base 30 is shown. These left and right stopper members 36 and 37 limit the amount of movement in the upper and lower directions of the battery mounting base 30 with respect to the base frame portion 21.

  As shown in FIG. 13, the left stopper member 36 includes a cylindrical spacer 36A inserted through the spacer insertion hole 30F2 of the left horizontal flange plate 30F and the left horizontal flange plate 30F in contact with the upper end of the spacer 36A. A substantially U-shaped stopper plate 36B disposed on the upper surface side, a bolt 36C inserted through the stopper plate 36B and the spacer 36A and having the lower end screwed into the left horizontal flange plate 21F of the base frame portion 21, and the outer periphery of the spacer 36A This is generally constituted by a cylindrical cushion rubber 36D disposed between the left horizontal flange plate 30F and the stopper plate 36B.

  Similarly to the left stopper member 36, the right stopper member 37 includes a spacer 37A inserted into the spacer insertion hole 30G2 of the right horizontal flange plate 30G, and an upper surface side of the right horizontal flange plate 30G in contact with the upper end of the spacer 37A. A stopper plate 37B, a bolt 37C inserted through the stopper plate 37B and the spacer 37A and having the lower end screwed into the right horizontal flange plate 21G of the base frame portion 21, and the right horizontal flange plate 30G and the stopper plate 37B. It is roughly constituted by a buffer rubber 37D provided therebetween.

  When the battery mounting base 30 moves greatly upward with respect to the base frame part 21 due to the vibration of the base frame part 21, the left horizontal flange plate 30 </ b> F of the battery mounting base 30 becomes the stopper plate 36 </ b> B of the left stopper member 36. At the same time, the right horizontal flange plate 30G abuts against the stopper plate 37B of the right stopper member 37. Accordingly, the amount of movement of the battery mounting base 30 in the upward and downward directions with respect to the base frame portion 21 can be limited by the left and right stopper members 36 and 37, and each elastic support member 27 is deformed beyond the elastic limit. It becomes the composition which suppresses doing.

  Next, a connection mechanism that connects the left and right support columns 23 and 24 of the rear frame 20 and the battery table 31 will be described.

  That is, reference numeral 38 denotes a coupling mechanism provided between the coupling beam 25 that couples the upper ends of the left and right columns 23 and 24 and the upper table 34 of the battery table 31. As shown in FIGS. 14 to 16, the connecting mechanism 38 is roughly constituted by a frame side bracket 39, a table side bracket 40, and a link 41, which will be described later, and the battery table 31 has left and right support columns 23 and 24. Is allowed to move upward and downward, and restricts movement forward, backward, left, and right.

  Reference numeral 39 denotes a frame-side bracket provided on the connecting beam 25 that connects the upper ends of the left column 23 and the right column 24. The frame side bracket 39 is formed of angle steel having an L-shaped cross section, and is attached to a mounting board 39A bolted to the left and right central portions of the connecting beam 25, and welded to the mounting board 39A. The left bracket body 39B and the right bracket body 39C are fixed to each other and face each other with an interval A in the left and right directions. A pin insertion hole through which a frame side connecting pin 42 (described later) is inserted is formed in the center of each of the left bracket body 39B and the right bracket body 39C, and on the opposite side of the right bracket body 39C from the left bracket body 39B. A cylindrical flange 39D is fixed to the outer surface.

  Reference numeral 40 denotes a table side bracket provided on the upper table 34 corresponding to the frame side bracket 39. The table side bracket 40 is fixed to the rear end edge of the frame member 34A constituting the upper table 34 by means of welding or the like, and the left bracket body 40A and the right bracket body facing each other with a spacing A in the left and right directions. 40B. A pin insertion hole through which a later-described table side connecting pin 43 is inserted is formed in the center of each of the left bracket body 40A and the right bracket body 40B, and the opposite side of the right bracket body 40B to the left bracket body 40A is formed. A cylindrical collar 40C is fixed to the outer surface.

  Reference numeral 41 denotes a link for connecting the frame side bracket 39 and the table side bracket 40. The link 41 is roughly constituted by a frame side boss cylinder 41A, a table side boss cylinder 41B, and a connection body 41C. ing.

  The frame-side boss cylinder 41A is a cylindrical body having a length (axis dimension) slightly smaller than the distance A between the left and right bracket bodies 39B and 39C constituting the frame-side bracket 39. The cylindrical body 41B is formed of a cylindrical body having a length dimension (axial dimension) slightly smaller than the interval A between the left and right bracket bodies 40A and 40B constituting the table side bracket 40. The frame-side boss cylinder 41A and the table-side boss cylinder 41B are integrally connected via a plate-like connection body 41C.

  The frame side boss cylinder 41A of the link 41 is pin-coupled to the frame side bracket 39 via the frame side connection pin 42 so as to be able to swing upward and downward, and the table side boss cylinder 41B is connected to the table side connection pin 43. The pin is coupled to the table side bracket 40 so as to be swingable upward and downward.

  Further, the frame side connection pin 42 is retained and prevented from rotating with respect to the frame side bracket 39 by a retaining bolt 44 inserted in a radial direction into the flange portion 39D of the frame side bracket 39, and the table side connection pin 43 is The table side bracket 40 is retained and prevented from being rotated by retaining bolts 45 inserted in the radial direction into the flange portions 40C of the table side bracket 40.

  Accordingly, when each elastic support member 27 is elastically deformed by the vibration of the rear frame 20, as shown in FIGS. 17 and 18, the frame side boss cylinder 41A of the link 41 pin-coupled to the frame side bracket 39 is used as a fulcrum. The table-side boss cylinder 41B of the link 41 that is pin-coupled to the table-side bracket 40 moves (swings) in an arc shape upward and downward. As a result, the upper table 34 to which the table side bracket 40 is fixed moves exclusively upward and downward with the middle table 33 and the upper table 32 with respect to the left and right support columns 23 and 24. The table 31 as a whole can be restricted from moving in the forward, backward, left, and right directions.

  In this case, as shown in FIG. 16, the frame side boss cylinder 41A of the link 41 has a length dimension slightly smaller than the interval A between the left and right bracket bodies 39B and 39C constituting the frame side bracket 39. The table-side boss cylinder 41B of the link 41 has a length dimension slightly smaller than the interval A between the left and right bracket bodies 40A, 40B constituting the table-side bracket 40. As a result, it is possible to suppress the rattling of the link 41 with respect to the frame side bracket 39 in the left and right directions and the rattling of the link 41 with respect to the table side bracket 40 in the left and right directions. The structure is such that movement in the left and right directions can be surely restricted by the connecting mechanism 38.

  Further, as shown in FIG. 11, the center P <b> 1 of the frame side connection pin 42 that is the center of the swinging operation of the link 41 of the connection mechanism 38, the front plate 21 </ b> A of the base frame portion 21, and the front plate of the battery mounting base 30. A virtual line connecting the center P2 in the height direction of the front slide plate 35A arranged between the front slide plate 35A and 30A is defined as a connecting line L, and a center of gravity when the battery 29 is mounted on the battery table 31 is defined as G. If the height dimension from the bottom plate 21E of 21 to the coupling mechanism 38 (the center P1 of the frame side coupling pin 42) is H, this height dimension H is such that the center of gravity G of the battery table 31 is below the coupling line L. Is set to the dimension located at

  Thereby, each support | pillar 23 and 24 of the rear frame 20 and the battery table 31 can be connected through the connection mechanism 38 in the position as high as possible, and the lower table 32, the middle table 33, and the upper table 34 are piled up. Even when the gravity center position G of the battery table 31 becomes high, the upper end side of the battery table 31 can be supported in a stable state by the connecting mechanism 38.

  Reference numeral 46 denotes an exterior cover that surrounds the driver's seat 6 and is disposed on the front frame 13. The exterior cover 46 includes the electric motor 7, the hydraulic pump 8, and the operation that are mounted on the front frame 13. The equipment for mounting the oil tank 9 or the like is accommodated. Reference numeral 47 denotes a rear cover disposed on the rear frame 20. The rear cover 47 includes a battery storage structure 28 mounted on the rear frame 20 and a number of batteries 29 mounted on the battery storage structure 28. Is to be accommodated.

  The electric excavator 1 according to the present embodiment has the above-described configuration, and the excavator 1 is powered by electric power from a large number of batteries 29 mounted on the rear frame 20 via the battery storage structure 28. The electric motor 7 is rotated and the hydraulic pump 8 is driven. Then, when an operator seated in the driver's seat 6 operates the operation lever, excavation work such as earth and sand can be performed by the work device 4 while turning the upper swing body 3.

  Here, during excavation work using the working device 4, a large vibration is transmitted from the front frame 13 to which the working device 4 is attached to the rear frame 20, but the battery mounting base 30 serving as the base of the battery housing structure 28 is The plurality of elastic support members 27 are elastically supported on the base frame portion 21 of the rear frame 20.

  For this reason, the vibration of the rear frame 20 is absorbed by the elastic deformation of each elastic support member 27, so that the vibration of the rear frame 20 is directly transmitted to each battery 29 mounted on the battery housing structure 28. Can be prevented, the performance of each battery 29 can be secured, and the life of the battery 29 can be extended.

  Here, each elastic support member 27 is elastically deformed by vibration during excavation work of the hydraulic excavator 1, so that the battery mounting base 30 of the battery storage structure 28 is forward, rearward or leftward with respect to the rear frame 20. In the case of a large movement in the right direction (horizontal direction), each battery 29 mounted on the battery table 31 may interfere with the left and right struts 23 and 24 of the rear frame 20, the guard pipe 26, and the like. is there.

  On the other hand, in the present embodiment, the battery mounting base 30 of the battery housing structure 28 is arranged inside the frame-shaped base frame portion 21 constituting the rear frame 20, and the outer surface 30 </ b> H of the battery mounting base 30 is entirely Front, rear, left, and right slide plates 35A, 35B, 35C, and 35D are provided on the inner surface 21K of the base frame portion 21 that faces the periphery. For this reason, when the battery mounting base 30 tries to move forward, rearward, leftward, and rightward due to elastic deformation of the elastic support member 27, the outer surface 30H of the battery mounting base 30 moves to the slide plates 35A, 35B, 35C. , 35D. As a result, the battery mounting base 30 moves exclusively upward and downward in accordance with the elastic deformation of the elastic support member 27, and each slide plate moves the battery mounting base 30 forward, rearward, leftward and rightward. It can be limited by 35A, 35B, 35C, 35D.

  On the other hand, in the present embodiment, the connection beam 25 that connects the left and right columns 23 and 24 erected on the rear frame 20, and the upper table 34 of the battery table 31 that is mounted on the battery mounting base 30. The space is connected via a connection mechanism 38 including a frame side bracket 39, a table side bracket 40, and a link 41.

  For this reason, when each elastic support member 27 is elastically deformed by vibration of the rear frame 20, as shown in FIGS. 17 and 18, the frame side boss cylinder 41A of the link 41 pin-coupled to the frame side bracket 39 is used as a fulcrum. The table-side boss cylinder 41B of the link 41 that is pin-coupled to the table-side bracket 40 swings upward and downward in an arc shape. As a result, the upper table 34 to which the table side bracket 40 is fixed moves upward and downward with the middle table 33 and the upper table 32 with respect to the left and right support columns 23 and 24. The movement to the front, back, left and right can be restricted.

  In this case, a virtual line connecting the center P1 of the frame side connecting pin 42, which is the center of the swinging motion of the link 41, and the center P2 in the height direction of the front slide plate 35A is defined as a connecting line L, and the battery table 31 is connected to the battery table 31. Assuming that the center of gravity position G when 29 is mounted is G, the height H from the bottom plate 21E of the base frame portion 21 to the center P1 of the frame side connection pin 42 of the connection mechanism 38 is connected to the center of gravity position G of the battery table 31. The dimension is set to be located below the line L (see FIG. 11).

  Thereby, each support | pillar 23 and 24 of the rear frame 20 and the battery table 31 can be connected through the connection mechanism 38 in the position as high as possible, and the lower table 32, the middle table 33, and the upper table 34 are piled up. Even when the gravity center position G of the battery table 31 becomes high, the upper end side of the battery table 31 can be supported in a stable state by the coupling mechanism 38.

  Thus, the movement of the battery mounting base 30 disposed on the lower end side of the battery housing structure 28 in the front, rear direction, left and right directions is performed between the base frame portion 21 of the rear frame 20 and the battery mounting base 30. The movement of the upper table 34 disposed on the upper end side of the battery housing structure 28 in the front, rear, left, and right directions is limited by the slide plates 35A, 35B, 35C, and 35D provided therebetween. It can restrict | limit with the connection mechanism 38 provided between each support | pillar 23,24 of the flame | frame 20, and the upper stage table 34. FIG.

  As a result, the battery housing structure 28 is reliably restricted from moving forward, rearward, leftward, and rightward with respect to the rear frame 20 due to vibration during operation of the hydraulic excavator 1, and stably supported. Therefore, the battery housing structure 28 or each battery 29 mounted on the battery housing structure 28 is reliably prevented from interfering with the left and right support columns 23 and 24 of the rear frame 20, the guard pipe 26, and the like. can do. As a result, it is not necessary to secure a space for preventing interference around the battery storage structure 28, and the amount of the battery 29 mounted on the battery storage structure 28 can be increased accordingly, so that the hydraulic excavator can be increased. 1 continuous operation time can be extended.

  For example, when the turning operation of the upper turning body 3 is stopped, the battery housing structure 28 on which a large number of batteries 29 are mounted is swayed in the turning direction due to the elastic deformation of the elastic support member 27, and the behavior in which the swinging back is caused. (Swivel jerking) can be suppressed. As a result, the posture of the upper swing body 3 when the swing operation is stopped can be stabilized, and the operability of the hydraulic excavator 1 by the operator can be improved.

  Moreover, according to the present embodiment, the left stopper member 36 is provided between the left horizontal flange plate 21F of the base frame portion 21 and the left horizontal flange plate 30F of the battery mounting base 30, and the right horizontal of the base frame portion 21 is also provided. A right stopper member 37 is provided between the flange plate 21G and the right horizontal flange plate 30G of the battery mounting base 30.

  For this reason, for example, when the battery mounting base 30 largely moves upward due to vibration transmitted to the rear frame 20, the left horizontal flange plate 30F of the battery mounting base 30 abuts against the stopper plate 36B of the left stopper member 36. The right horizontal flange plate 30G abuts against the stopper plate 37B of the right stopper member 37. As described above, the left and right stopper members 36 and 37 can protect each elastic support member 27 by suppressing excessive deformation of each elastic support member 27, and the battery is accommodated by each elastic support member 27. The structure 28 can be stably supported over a long period of time.

  Next, FIG. 19 thru | or FIG. 21 shows the 2nd Embodiment of this invention, and the feature of this embodiment is that the connection mechanism which connects between the support | pillar and battery table which were provided in the rear frame, That is, the ring member includes a ring member provided with a shaft insertion hole in a downward direction and a shaft body that is movably inserted into the shaft insertion hole of the ring member. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 51 denotes a connection mechanism provided between the left and right support columns 23, 24 of the rear frame 20 and the upper table 34 of the battery table 31, and this connection mechanism 51 is according to the first embodiment. It replaces with the connection mechanism 38, and is used for this Embodiment. Here, the coupling mechanism 51 is roughly constituted by a ring member 52 and a shaft body 55 described later, and allows the battery table 31 to move upward and downward with respect to the left and right support columns 23 and 24. It restricts movement in the forward, backward, left, and right directions.

  Reference numeral 52 denotes a ring member provided on the connecting beam 25 that connects the left column 23 and the right column 24. The ring member 52 is formed of a thick plate having a base end portion 52A having a rectangular shape and a tip portion 52B having an annular shape, and penetrates upward and downward in the central portion of the tip portion 52B. A shaft insertion hole 52C is formed. The base end portion 52A of the ring member 52 is fixed to the mounting substrate 53 having an L-shaped cross section by means of welding or the like, and the mounting substrate 53 is bolted to the left and right central portions of the connecting beam 25. Has been.

  Reference numeral 54 denotes a shaft body bracket fixed to the rear end side of the upper table 34. The shaft body bracket 54 is formed of a rectangular flat plate extending in the left and right directions, and the rear end of the frame member 34A constituting the upper table 34. Formed in a T-shape as a whole by a fixing plate 54A bolted to the edge and a protruding plate 54B that is fixed to an intermediate portion in the left and right directions of the fixing plate 54A and protrudes rearward toward the ring member 52 Has been. A shaft body 55 described later is fixed to the lower surface side of the protruding plate 54B.

  Reference numeral 55 denotes a shaft provided on the upper table 34 corresponding to the ring member 52. The shaft body 55 is formed in a cylindrical shape having a diameter slightly smaller than the diameter of the shaft insertion hole 52C provided in the ring member 52, and means such as welding is used on the lower surface of the protruding plate 54B of the shaft body bracket 54. It is fixed. The shaft body 55 projects downward from the projecting plate 54B of the shaft body bracket 54, so that the shaft body 55 is inserted into the shaft insertion hole 52C of the ring member 52 so as to be movable upward and downward.

  The hydraulic excavator according to the second embodiment is provided between the support columns 23 and 24 of the rear frame 20 and the upper table 34 of the battery table 31 by the connecting mechanism 51 including the ring member 52 and the shaft body 55 described above. It is connected, and its basic action is not different from that according to the first embodiment.

  However, in this embodiment, when the elastic support member 27 is elastically deformed by the vibration of the rear frame 20, the shaft body 55 inserted into the shaft insertion hole 52 </ b> C of the ring member 52 is moved forward and backward by the ring member 52. The movement in the left and right directions is restricted, and the movement is made in the upward and downward directions along the shaft insertion hole 52C. As a result, the upper table 34 to which the shaft body 55 is attached moves exclusively upward and downward with the middle table 33 and the lower table 32, so that the battery table 31 is moved in the front, rear, left, and right directions. The movement can be surely limited.

  In each of the above-described embodiments, the excavator 1 in which the upper swing body 3 is configured to be separable by the front vehicle body 5 and the rear vehicle body 10 is taken as an example, and the swing frame 11 serving as the base of the upper swing body 3 is taken as an example. Exemplifies a case where the front frame 13 and the rear frame 20 made of different members are connected to each other. However, the present invention is not limited to this. For example, a single turning frame in which a front frame and a rear frame are integrated may be used.

  Moreover, in embodiment mentioned above, the case where the battery storage structure 28 is comprised by attaching the battery table 31 to the battery mounting base 30 which consists of a mutually different member is illustrated. However, the present invention is not limited to this. For example, a battery housing structure in which a frame-shaped battery mounting base is integrally provided on the lower end side of the battery table may be used.

  Further, in each of the above-described embodiments, the front slide plate 35A, the rear slide plate 35B, and the left slide are provided on the front plate 21A, the rear plate 21B, the left side plate 21C, and the right side plate 21D of the base frame portion 21 constituting the rear frame 20. The case where the plate 35C and the right slide plate 35D are attached is illustrated. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 22, the front plate 30A, the rear plate 30B, the left side plate 30C, and the right side plate 30C of the battery mounting base 30 constituting the battery housing structure 28 are provided. The slide plates 35A, 35B, 35C, and 35D may be attached to the face plate 30D.

  23, a front slide plate 35A is attached to both the front plate 21A of the base frame portion 21 and the front plate 30A of the battery mounting base 30 as in the second modification shown in FIG. The rear slide plate 35B is attached to both the 21B and the rear surface plate 30B of the battery mounting base 30, and the left slide plate 35C is attached to both the left side surface plate 21C of the base frame portion 21 and the left side surface plate 30C of the battery mounting base 30. The right slide plate 35D may be attached to both the right side plate 21D of the frame portion 21 and the right side plate 30D of the battery mounting base 30.

  In the embodiment described above, the center of gravity G of the battery table 31 is a virtual connection that connects the center P1 of the frame-side connection pin 42 constituting the connection mechanism 38 and the center P2 of the front slide plate 35A in the height direction. The case where the height dimension H from the baseplate 21E of the base frame part 21 to the connection mechanism 38 is set so that it may be located below the line L is illustrated. However, the present invention is not limited to this, and the height dimension H from the bottom plate 21E of the base frame portion 21 to the connection mechanism 38 is set so that the center of gravity G of the battery table 31 is on the connection line L. Also good.

  Furthermore, in each embodiment mentioned above, the hydraulic excavator 1 is illustrated as an electric construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a wheel loader and a hydraulic crane.

1 Excavator (construction machine)
7 Electric motor 11 Turning frame (body frame)
DESCRIPTION OF SYMBOLS 13 Front frame 20 Rear frame 21 Base frame part 21K Inner surface 23 Left column 24 Right column 27 Elastic support member 28 Battery storage structure 29 Battery 30 Battery mounting base 30H Outer surface 31 Battery table 35 Slide plate 35A Front slide plate 35B Rear slide plate 35C Left slide plate 35D Right slide plate 36 Left stopper member 37 Right stopper member 38, 51 Connection mechanism 39 Frame side bracket 39B, 40A Left bracket body 39C, 40B Right bracket body 40 Table side bracket 41 Link 41A Frame side boss cylinder 41B Table side boss cylinder 41C Connecting body 52 Ring member 52C Shaft insertion hole 55 Shaft body

Claims (9)

In an electric construction machine that carries a work by mounting a battery on the rear part of the body frame and driving an electric motor with the battery,
The vehicle body frame includes a front frame on which a working device is provided on the front side and the electric motor is mounted, and a rear frame having a frame-like base frame portion and provided on the rear side of the front frame. Configure
The rear frame is provided with a plurality of elastic support members around the base frame portion,
The rear frame has a frame-like battery mounting base that is arranged with a gap over the entire circumference inside the base frame portion and elastically supported by the elastic support members, and the battery is mounted on the rear frame. A battery housing structure,
The battery is mounted on one or both of the inner surface of the base frame part constituting the rear frame and the outer surface of the battery mounting base constituting the battery housing structure by elastic deformation of the elastic support member. The slide plate is configured to allow the base to move upward and downward with respect to the rear frame, and to restrict movement to the front, rear, left, and right with respect to the rear frame. Electric construction machine that features. The inner surface of the base frame portion constituting the rear frame and the outer surface of the battery mounting base constituting the battery housing structure are configured to face each other in the front, rear direction, left, and right direction over the entire circumference,
The slide plate includes a front slide plate disposed between the base frame portion and the battery mounting base on the front side in the front and rear directions, and a base frame portion and a battery mounting base on the rear side in the front and rear directions. A rear slide plate disposed between the base frame portion and the battery mounting base on the left side in the left and right directions, and the base frame portion and battery on the right side in the left and right directions. The electric construction machine according to claim 1, wherein the electric construction machine is configured by a right slide plate disposed between the mounting base.   A stopper member is provided between the base frame portion of the rear frame and the battery mounting base of the battery housing structure to limit the amount of movement of the battery mounting base in the upward and downward directions with respect to the rear frame. Item 3. The electric construction machine according to item 1 or 2. A support column extending upward and downward is provided on the rear end side of the rear frame,
The battery housing structure includes the battery mounting base that is elastically supported by the elastic support members, and a battery table that is disposed on the battery mounting base and on which the battery is mounted.
4. The electric construction machine according to claim 1, 2, or 3, wherein a coupling mechanism that couples the column and the battery table is provided between the column and the battery table.   5. The electric construction machine according to claim 4, wherein the coupling mechanism is configured to allow movement of the battery table in the upward and downward directions with respect to the support column and restrict movement in the front, rearward, left, and right directions.   The coupling mechanism includes a frame-side bracket fixed to the support column, a table-side bracket fixed to the battery table, and one end connected to the frame-side bracket so that it can swing upward and downward about the pin. 6. The electric construction machine according to claim 4 or 5, wherein the other end side is constituted by a link coupled to the table side bracket so as to be swingable upward and downward about the pin. The frame-side bracket is composed of a pair of bracket bodies arranged at intervals in the left and right directions,
The table side bracket is composed of a pair of bracket bodies arranged at intervals in the left and right directions,
The link includes a frame-side boss cylinder having a length corresponding to the interval between the left and right bracket bodies constituting the frame-side bracket, and a pin inserted through the inner peripheral side, and the table-side bracket. A table-side boss cylinder having a length corresponding to the interval between the left and right bracket bodies and having a pin inserted through the inner periphery thereof, and between the frame-side boss cylinder and the table-side boss cylinder. The electric construction machine according to claim 6, wherein the electric construction machine is constituted by a connecting body to be connected.   When a virtual line connecting the connecting mechanism and the front slide plate disposed between the front end side of the base frame portion and the front end side of the battery mounting base in the slide plate is a connecting line, 8. The configuration according to claim 6, wherein a height position of the coupling mechanism is set so that a position of the center of gravity when the battery is mounted is located on the coupling line or below the coupling line. 9. Electric construction machine. The coupling mechanism is fixed to one member of the support column and the battery table, and a ring member provided with a shaft insertion hole penetrating upward and downward;
6. The electric motor according to claim 4, comprising: a shaft body that is fixed to the other member of the column and the battery table and is inserted into a shaft insertion hole of the ring member so as to be movable upward and downward. Construction machine.

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