Construction machinery

Abstract

A hydraulic excavator (1) includes a seat base (11) that is provided between the driver's seat (10) and the top surface (9E) of a motor cover (9) covering an engine (7) in an openable and closable manner, and that secures the driver's seat (10) to the upper side of the motor cover (9). In addition, a base plate (12) of the seat base (11) includes four screw holes (12F) as a driver's seat securing unit for attaching to the driver's seat (10), and six bolt insertion holes (12D, 12E) as a motor cover securing unit for attaching to the motor cover (9). Additionally, the bolt insertion holes (12D, 12E) of the base plate (12) are arranged more widely than the screw holes (12F). Thus, the seat base (11) can be attached to the motor cover (9) before the driver's seat (10) is attached.

Description

[Technical Field]

[0001] The present invention relates to a construction machine in which a driver's seat is provided above a motor cover that covers a motor. [Background technology]

[0002] A hydraulic excavator as a construction machine is composed of a self-propelled lower running body, an upper rotating body that is rotatably mounted on the lower running body, and a work device that is rotatably mounted on the front side of the upper rotating body.

[0003] Among hydraulic excavators, ultra-compact hydraulic excavators known as mini excavators have a small and limited space for installing equipment on the upper rotating body. The upper rotating body of an ultra-compact hydraulic excavator includes a rotating frame that forms a support structure, a prime mover such as an engine provided on the rear side of the rotating frame, a prime mover cover that can be opened and closed to cover the prime mover, and a driver's seat provided above the prime mover cover and in which an operator sits (Patent Document 1).

[0004] The engine cover is made of, for example, a thin steel plate to facilitate opening and closing operations and reduce costs, and the driver's seat is attached to the engine cover using, for example, a plurality of bolts. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-56219 Summary of the Invention

[0006] The hydraulic excavator in Patent Document 1 is configured to attach the driver's seat to the motor cover using multiple bolts. In this case, the driver's seat mounting portion of the motor cover is subjected to loads due to the weight of the driver's seat and the operator seated in the seat. The bolts that mount the driver's seat to the motor cover are concentrated around the driver's seat based on the shape specifications of the driver's seat so that they are within reach of a wrench or other screw tightening tool. This results in a problem in that the load is concentrated on one portion of the motor cover, making the motor cover prone to deformation.

[0007] The present invention has been made in consideration of the problems of the prior art described above, and an object of the present invention is to provide a construction machine that can prevent loads from concentrating on one part of the engine cover and suppress deformation of the engine cover.

[0008] The present invention relates to a construction machine comprising a self-propelled lower running body and an upper rotating body rotatably mounted on the lower running body, the upper rotating body comprising a rotating frame forming a support structure, a prime mover mounted on the rear side of the rotating frame, a prime mover cover that can be opened and closed and covers the prime mover, and a driver's seat mounted above the prime mover cover, the construction machine further comprising a seat base that is mounted between the upper surface of the prime mover cover and the driver's seat and fixes the driver's seat to the upper side of the prime mover cover, the seat base having a driver's seat fixing portion attached to the driver's seat and a prime mover cover fixing portion attached to the prime mover cover, the prime mover cover fixing portion of the seat base being arranged over a wider area than the driver's seat fixing portion.

[0009] According to the present invention, it is possible to prevent a load from being concentrated on one part of the motor cover, and to suppress deformation of the motor cover. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a hydraulic excavator according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a perspective view showing the hydraulic excavator with the prime mover cover open. [Figure 3] FIG. 2 is a right side view showing the hydraulic excavator with the working implement and the roll bar omitted. [Figure 4] FIG. 4 is a right side view similar to FIG. 3, showing the hydraulic excavator with the driver's seat at the frontmost position. [Figure 5] FIG. 4 is a right side view similar to FIG. 3, showing the hydraulic excavator with the operator's seat in the rearmost position. [Figure 6] FIG. 1 is a perspective view showing a hydraulic excavator with a seat belt, a grease gun, and a cup holder attached to a seat base. [Figure 7] FIG. 7 is a cross-sectional view of the hydraulic excavator as seen from the direction of arrows VII-VII in FIG. 3. [Figure 8] FIG. 2 is a perspective view showing the rear of the upper rotating body with the motor cover open. [Figure 9] FIG. 2 is a perspective view showing the engine cover and the seat base in an exploded state. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to FIGS. 1 to 12, taking as an example a case where the construction machine is applied to a hydraulic excavator.

[0012] 1 and 2, the hydraulic excavator 1 is made up of a self-propelled crawler-type lower traveling body 2, an upper rotating body 3 rotatably mounted on the lower traveling body 2, and a swing-type working device 4 that is rotatable and swingable on the front side of the upper rotating body 3. Here, the hydraulic excavator 1 according to the embodiment is a model known as an ultra-mini excavator, with a machine weight (total weight) of, for example, about 1 ton, which can be used for demolition work inside buildings and excavation work in narrow places such as alleys.

[0013] The upper rotating body 3 includes a rotating frame 5, an engine 7, a motor cover 9, a driver's seat 10, a seat base 11, seat belts 19 and 20, a grease gun 21, and a cup holder 22.

[0014] The revolving frame 5 includes a bottom plate 5A made of a rectangular thick metal plate extending in the front-to-rear direction, a support portion 5B provided at the front of the bottom plate 5A and protruding forward, and a counterweight 5C extending in the left-to-right direction and upward at the rear of the bottom plate 5A. The support portion 5B supports the working device 4 so that it can swing left and right.

[0015] The counterweight 5C is formed as a heavy object for balancing the weight with the working device 4. A connecting member 9F of the motor cover 9, which will be described later, is attached to the top surface of the counterweight 5C. This allows the motor cover 9 to be supported on the top of the counterweight 5C via the connecting member 9F so that it can be opened and closed (rotated). In addition, a roll bar 27, which will be described later, is attached to the rear side of the revolving frame 5 (counterweight 5C).

[0016] The side cover 6 is provided to surround the periphery of the bottom plate 5A of the revolving frame 5. The side cover 6 is erected with a height dimension equivalent to that of the counterweight 5C. The side cover 6 is also bent in a U-shape so that the rear side is open.

[0017] The engine 7 constitutes a prime mover and is provided at the rear of the revolving frame 5. The engine 7 is located in front of the counterweight 5C and is disposed horizontally extending in the left-right direction. The engine 7 drives a hydraulic pump 8 (see FIG. 8). Note that the prime mover may be a hybrid prime mover consisting of an engine and an electric motor, or an electric motor.

[0018] The motor cover 9 covers the engine 7 in an openable and closable manner. The motor cover 9 is formed as an openable cover whose front side can be opened and closed in the vertical direction, with the rear side as a fulcrum. As shown in FIG. 9, the motor cover 9 is formed in a box shape with an open bottom, and is made up of a front side 9A, a rear side 9B, a left side 9C, a right side 9D, and a top side 9E. As shown in FIG. 3, the lower part of the front side 9A forms a front side 9A1 that extends vertically at the forefront of the motor cover 9. The top side 9E of the motor cover 9 is formed to be gently curved and slope downwards.

[0019] As shown in Figure 8, a connecting member 9F that serves as a fulcrum when opening and closing is provided at the bottom of the rear portion 9B. The motor cover 9 is rotatably attached to the counterweight 5C via this connecting member 9F. Meanwhile, an opening / closing lever 9G is provided at the front portion 9A. By operating the opening / closing lever 9G, the motor cover 9 is released from its connection (lock) to the structure on the revolving frame 5 side, allowing it to be opened (to rotate upward).

[0020] As shown in Fig. 9, a bracket 9H is erected on the front of the upper surface 9E, extending in the left-right direction. A plurality of, for example, two screw holes 9J are formed in the bracket 9H at intervals in the left-right direction. Furthermore, a plurality of, for example, four screw holes 9K are formed on the rear of the upper surface 9E at intervals in the left-right direction. A bolt 13 for attaching the front portion of the seat base 11 is screwed into the front screw hole 9J. Meanwhile, a bolt 13 for attaching the rear portion of the seat base 11 is screwed into the rear screw hole 9K.

[0021] Here, the six screw holes 9J, 9K provided in the top surface portion 9E are arranged over a wide area of the top surface portion 9E. Furthermore, when the seat base 11 is attached using bolts 13, the six screw holes 9J, 9K are connected by the seat base 11. Therefore, even if a load acts on one screw hole 9J or screw hole 9K, this load can be distributed to the other five screw holes 9J, 9K. This allows the engine cover 9 to be formed using an inexpensive, lightweight thin steel plate or the like while maintaining durability (the strength necessary to support the driver's seat 10).

[0022] The driver's seat 10 is provided above the motor cover 9. More specifically, the driver's seat 10 is attached to the upper surface 9E of the motor cover 9 via a seat base 11. The driver's seat 10 is movable in the front-rear direction so that the seating position can be adjusted according to the operator's body shape and operating posture. The driver's seat 10 includes a slide mechanism 10A, a seat portion 10B attached to the slide mechanism 10A, and a backrest portion 10C extending upward from the rear of the seat portion 10B.

[0023] The slide mechanism 10A can move the operator's seating position, i.e., the position of the seat portion 10B and the backrest portion 10C, in the front-rear direction. The slide mechanism 10A includes a fixed portion fixed to the seat base 11 (motor cover 9), a moving portion provided on the fixed portion, a slide rail located between the fixed portion and the moving portion and moving the moving portion in the front-rear direction on the fixed portion, and a lever portion 10A1 provided in the center of the front side of the moving portion and switching between moving and fixed positions of the moving portion. As a result, the weight of the driver's seat 10 is increased by the slide mechanism 10A, which increases the load acting on the object to which the driver's seat 10 is attached.

[0024] For example, when the lever portion 10A1 of the slide mechanism 10A is pulled up, it allows the seat portion 10B (moving portion) to move in the front-to-rear direction, whereas when the lever portion 10A1 is lowered down, it restricts the movement of the seat portion 10B (moving portion) and fixes the seating position.

[0025] The driver's seat 10 is mounted such that the lower fixing portion of the slide mechanism 10A is placed on the upper surface of the seat base 11, and in this state, a bolt (neither of which is shown) inserted into a bolt insertion hole in the fixing portion is screwed into a screw hole 12F provided in the base plate 12 of the seat base 11. This allows the driver's seat 10 to be moved in the front-to-rear direction on the seat base 11 (allowing the seating position to be adjusted). Specifically, the seat portion 10B and the backrest portion 10C of the driver's seat 10 can be moved and fixed by the slide mechanism 10A to the foremost position shown in FIG. 4, the rearmost position shown in FIG. 5, and an intermediate position between the foremost and rearmost positions (see FIG. 3).

[0026] Next, the configuration and effects of the seat base 11, which is a characteristic part of this embodiment, will be described in detail.

[0027] The seat base 11 is provided between the upper surface 9E of the motor cover 9 and the driver's seat 10. The seat base 11 also fixes the driver's seat 10 to the upper side of the motor cover 9. The seat base 11 includes a base plate 12, a handle 14, seat belt mounting portions 15 and 16, a grease gun mounting portion 17, and a cup holder mounting portion 18.

[0028] 9 to 11, the base plate 12 is formed of a middle plate 12A made of a rectangular frame-shaped flat plate, a front plate 12B that bends and extends downward from the front edge of the middle plate 12A, and a rear plate 12C that is located rearward of the middle plate 12A and extends further in the left-right direction than the middle plate 12A. Two bolt insertion holes 12D are provided in the front plate 12B as motor cover fixing portions at positions corresponding to two screw holes 9J provided in the bracket 9H of the motor cover 9. Furthermore, four bolt insertion holes 12E are provided in the rear plate 12C as motor cover fixing portions at positions corresponding to four screw holes 9K provided in the top surface 9E of the motor cover 9.

[0029] Furthermore, four screw holes 12F serving as driver's seat fixing portions are provided in the base plate 12, positioned near the four corners of the middle plate portion 12A. Bolts (none of which are shown) inserted into four bolt insertion holes provided in the slide mechanism 10A of the driver's seat 10 are screwed into the four screw holes 12F.

[0030] 9, with the base plate 12 placed on the upper surface 9E of the motor cover 9, bolts 13 are inserted from the front into the front bolt insertion holes 12D and screwed into the threaded holes 9J of the motor cover 9. Furthermore, bolts 13 are inserted from above into the rear bolt insertion holes 12E and screwed into the threaded holes 9K of the motor cover 9. This allows the seat base 11 to be attached to the upper surface 9E of the motor cover 9.

[0031] Furthermore, the driver's seat 10 (slide mechanism 10A) is placed on the base plate 12, and bolts inserted into four bolt insertion holes provided in the fixing portion of the slide mechanism 10A are screwed into the screw holes 12F. This allows the driver's seat 10 (slide mechanism 10A) to be attached to the seat base 11.

[0032] Here, since the base plate 12 is provided as a separate member from the motor cover 9, it can have a higher strength than the steel plate forming the motor cover 9. For example, it can be made thicker (larger in thickness) or made of a high-strength material. Furthermore, the base plate 12 is bolted to the upper surface 9E of the motor cover 9 via six bolt insertion holes 12D, 12E, which are distributed over a wider area than the four screw holes 12F. Therefore, even if a load from the driver's seat 10 or a load generated when the seat belts 19, 20 are pulled acts on a single point, the base plate 12 can transmit this load to the motor cover 9 in a distributed manner across six points over a wide area. Furthermore, the base plate 12 is configured such that the bolts 13 that attach the front side are laid horizontally (with their axes facing horizontally) and are screwed in from the front. This allows the bolts 13 to be easily turned without being obstructed by the driver's seat 10, improving the workability of attaching and removing the base plate 12.

[0033] The handles 14 are provided symmetrically on both the left and right sides of the base plate 12. Therefore, the left and right handles 14 can be grasped from either the left or right when opening or closing the motor cover 9. The handles 14 are located forward of the center position in the fore-and-aft direction of the base plate 12. That is, the handles 14 are located forward of the motor cover 9, far away from the rear connecting member 9F, which serves as the fulcrum when opening or closing the motor cover 9. This allows the handles 14 to be grasped at a position away from the pivot point when opening or closing the motor cover 9, making it possible to easily open or close the motor cover 9 with little force. Furthermore, if the operator experiences shaking while traveling, they can stabilize their body (posture) by grasping the handles 14.

[0034] 3 to 5, the handle 14 is disposed rearward of the front surface 9A1 of the front portion 9A of the motor cover 9. Therefore, the handle 14 is designed so that the legs (calves, etc.) of the operator sitting in the driver's seat 10 do not inadvertently interfere with the handle 14.

[0035] The handle 14 is composed of a bracket 14A that is located outside the seat portion 10B of the driver's seat 10 in the left-right direction and protrudes upward from the middle plate portion 12A of the base plate 12, an outward bar 14B that extends outward in the left-right direction from the top of the bracket 14A, an outer grip portion 14C that bends from the tip (outer end) of the outward bar 14B and extends forward, a front grip portion 14D that bends from the tip (front end) of the outer grip portion 14C and extends inward in the left-right direction, with its tip reaching the front plate portion 12B of the base plate 12, and an attachment bar 14E that bends from the tip of the front grip portion 14D and extends rearward and is attached to the front plate portion 12B.

[0036] The outer grip portion 14C is located on the outer side in the left-right direction of the seat base 11 and extends in the front-rear direction. The outer grip portion 14C is inclined downward toward the front so as to fit along the upper surface 9E of the motor cover 9. There is a predetermined gap between the outer grip portion 14C and the upper surface 9E so that a hand can be inserted between the outer grip portion 14C and the upper surface 9E even when wearing gloves, for example.

[0037] The outer grip 14C is positioned lower than the seat surface (top surface) of the seat 10B of the driver's seat 10 so as not to get in the way when the operator sits down on or stands up from the seat 10B. Furthermore, as shown in FIG. 11, the outer grip 14C is inclined inward in the left-right direction toward the front. Therefore, the protrusion dimension of the outer grip 14C at the front position near the operator's legs can be kept small. This prevents interference between the operator's legs and the outer grip 14C even when the operator places their legs near the engine cover 9 while seated on the driver's seat 10.

[0038] The front grip portion 14D is located in front of the seat base 11 and extends in the left-right direction. As shown in FIGS. 7 and 12, the front grip portion 14D is inclined downward from the outside to the inside in the left-right direction, and is therefore positioned lower than the driver's seat 10 (the moving portion of the slide mechanism 10A, the seat portion 10B) moved forward by the slide mechanism 10A. This prevents the driver's seat 10 from interfering with the front grip portion 14D even when the driver's seat 10 is moved to the intermediate position shown in FIG. 3 or the frontmost position shown in FIG. 4. Furthermore, the left and right mounting bars 14E (tips of the front grip portions 14D) sandwich the lever portion 10A1 of the slide mechanism 10A between them and are spaced far apart in the left-right direction. Therefore, the left and right mounting bars 14E can prevent interference with the lever portion 10A1 of the slide mechanism 10A even when the driver's seat 10 is moved to the intermediate position shown in FIG. 3 or the frontmost position shown in FIG. 4.

[0039] The seat base 11 is provided with mounting portions for mounting additional parts. Specifically, the seat base 11 is provided with seat belt mounting portions 15 and 16 for mounting seat belts 19 and 20 (described later), a grease gun mounting portion 17 for mounting a grease gun 21, a cup holder mounting portion 18 for mounting a cup holder 22, and the like.

[0040] A pair of seat belt attachment portions 15, 16 are provided on both the left and right sides of the rear plate portion 12C of the base plate 12. The seat belt attachment portions 15, 16 are formed of plates bent into an L shape, with their lower edges fixed to the rear plate portion 12C. Screw holes 15A, 16A are provided on attachment surfaces of the seat belt attachment portions 15, 16 that extend in the front-to-rear direction. A base portion 19A of the left seat belt 19 is attached to the left seat belt attachment portion 15 by threading a bolt inserted through a base portion 19A of the left seat belt 19 into the screw hole 15A. On the other hand, a base portion 20A of the right seat belt 20 is attached to the right seat belt attachment portion 16 by threading a bolt inserted through a base portion 20A of the right seat belt 20 into the screw hole 16A.

[0041] European standards require that seat belts be installed even on ultra-compact hydraulic excavators. In these cases, the seat belt is generally attached somewhere other than the driver's seat, for example, on the engine cover. Furthermore, European standards require that the seat belt attachment strength be strong enough to withstand a pulling force of 15,000 N.

[0042] However, since the motor cover 9 in this embodiment is formed using a thin steel plate or the like, if the seat belts 19, 20 are bolted directly to the motor cover 9, stress may be concentrated at one bolted point, making it unable to withstand a force of 15,000 N.

[0043] In contrast, the seat belt attachment parts 15, 16 are attached to a strong seat base 11, and are attached to the motor cover 9 via this seat base 11. Therefore, the load acting on the seat belt attachment parts 15, 16 when the seat belts 19, 20 are pulled can be transmitted to the motor cover 9 via the seat base 11 in a widely dispersed state.

[0044] Grease gun mounting portion 17 is provided at the rear of base plate 12. Grease gun mounting portion 17 has a horizontally extending mounting surface with a plurality of, for example, two, screw holes 17A spaced apart in the left-right direction. Grease gun holder 21A (grease gun 21) is attached to grease gun mounting portion 17 by threading a bolt inserted into grease gun holder 21A into screw hole 17A.

[0045] Cup holder attachment portion 18 is provided on right handle 14. Cup holder attachment portion 18 is fixed to the tip end of outward bar 14B and extends upward. As shown in Figure 9, a screw hole 18A is provided on the upper side of cup holder attachment portion 18, into which a bolt (not shown) for attaching cup holder 22 is screwed.

[0046] The left seat belt 19 is attached to the left seat belt attachment portion 15. The left seat belt 19 is attached to the seat belt attachment portion 15 by a bolt inserted into a base 19A being screwed into a screw hole 15A of the seat belt attachment portion 15. The right seat belt 20 is attached to the right seat belt attachment portion 16. The right seat belt 20 is attached to the seat belt attachment portion 16 by a bolt inserted into a base 20A being screwed into a screw hole 16A of the seat belt attachment portion 16. The left seat belt 19 and the right seat belt 20 are connected around the abdomen of an operator seated in the driver's seat 10, thereby securing the operator to the driver's seat 10.

[0047] The grease gun 21 is provided on the rear side of the seat base 11. The grease gun 21 is a tool for filling grease as a lubricant into oil supply points of the hydraulic excavator 1. The grease gun 21 is equipped with a grease gun holder 21A. The grease gun holder 21A is placed on the grease gun mounting part 17. In this state, the grease gun holder 21A is attached to the grease gun mounting part 17 by threading an inserted bolt into the threaded hole 17A.

[0048] Cup holder 22 is provided on handle 14 on the right side of seat base 11. Cup holder 22 is a cylindrical body with a bottom, and a beverage container can be placed inside it. Cup holder 22 is attached to cup holder attachment part 18 by threading a bolt inserted into the side of cup holder 22 into threaded hole 18A of cup holder attachment part 18.

[0049] A floor 23 is provided extending forward from the engine cover 9. A lever stand 24 is provided in an upright position at the front of the floor 23. An operating lever 25 for travel and an operating lever 26 for work are provided on the upper part of the lever stand 24.

[0050] As shown in FIG. 1, the roll bar 27 is attached to the rear side of the counterweight 5C of the revolving frame 5. The roll bar 27 is made up of an inverted U-shaped strength member that extends to a position higher than the operator sitting in the driver's seat 10. This allows the roll bar 27 to protect the operator when a structure falls on it or when the hydraulic excavator 1 is turned upside down. Also, as shown in FIG. 2, the roll bar 27 can be rotated horizontally and retracted so as not to get in the way when the prime mover cover 9 is opened.

[0051] The hydraulic excavator 1 according to this embodiment has the above-described configuration, and its operation will now be described.

[0052] The operator boards the vehicle on the floor 23 and sits in the driver's seat 10. At this time, the operator can move the position of the seat 10B forward or backward as desired by operating the lever 10A1 of the slide mechanism 10A. After adjusting the driver's seat 10 to a desired position, the operator fastens the seat belts 19 and 20.

[0053] An operator seated in the driver's seat 10 can drive the lower traveling body 2 by operating the operating lever 25 for driving on the lever stand 24. On the other hand, the operator can drive the upper rotating body 3 and rotate the working device 4 by operating the operating lever 26 for work, thereby performing work such as excavating earth and sand.

[0054] Furthermore, when performing maintenance on the engine 7 or the like, after moving the roll bar 27 horizontally, the open / close lever 9G is operated to release the lock, and the handle 14 is grasped to lift the prime mover cover 9. At this time, the handle 14 is separated from the connecting member 9F, which serves as the pivot point for the prime mover cover 9, so that the prime mover cover 9 can be easily lifted and opened with little force. With the prime mover cover 9 open, maintenance on the engine 7 or the like can be performed. Once maintenance on the engine 7 or the like is completed, the prime mover cover 9 is closed and the roll bar 27 is returned to its original position.

[0055] Thus, according to this embodiment, the seat base 11 is provided between the driver's seat 10 and the upper surface 9E of the motor cover 9, which covers the engine 7 in an openable and closable manner. The seat base 11 secures the driver's seat 10 to the upper side of the motor cover 9. The base plate 12 of the seat base 11 has four screw holes 12F as a driver's seat fixing portion attached to the driver's seat 10 and six bolt holes 12D, 12E as a motor cover fixing portion attached to the motor cover 9. The bolt holes 12D, 12E of the base plate 12 are arranged over a wider area than the screw holes 12F. In other words, the area of the polygonal faces having the six bolt holes 12D, 12E as the motor cover fixing portions as vertices is set to be larger than the area of the polygonal faces having the four screw holes 12F as the driver's seat fixing portions as vertices. In this case, the seat base 11 can be attached to the motor cover 9 before the driver's seat 10 is attached. In other words, when the driver's seat 10 is installed, the installation position (bolt fastening position) of the seat base 11 relative to the engine cover 9 can be set to a position that cannot be reached with screw tightening tools such as wrenches and socket wrenches, specifically, inside the seat belt installation portions 15, 16.

[0056] Therefore, the seat base 11 can be attached at multiple locations over a wide range of the motor cover 9. This allows the load acting on the seat base 11 from the driver's seat 10 to be distributed to multiple attachment locations by the seat base 11. As a result, it is possible to prevent the load from concentrating on one part of the motor cover 9, and therefore deformation of the motor cover 9 can be suppressed even when the strength of the motor cover 9 is kept low.

[0057] Furthermore, in this embodiment, driver's seat 10 is equipped with slide mechanism 10A that moves the seating position in the front-rear direction, which increases the weight of driver's seat 10 and further increases the load on the mounting portion of driver's seat 10. Even in this case, with a mounting structure in which seat base 11 is interposed between motor cover 9 and driver's seat 10, the load on motor cover 9 can be distributed to prevent deformation of motor cover 9.

[0058] Furthermore, with the configuration in which the seat base 11 is disposed between the motor cover 9 and the driver's seat 10, the mounting position of the seat base 11 relative to the motor cover 9 can be set even if the specifications of the driver's seat 10 differ. In this case, the mounting position of the seat base 11 relative to the upper surface 9E of the motor cover 9 can be set away from the center of the upper surface 9E, which is easily deformed, i.e., near the bent portion of the motor cover, which serves as the fulcrum (starting point of deformation) when a load is applied to the upper surface 9E of the motor cover 9. Specifically, when a load is applied near the bent portion (ridge line portion) of the upper surface 9E of the motor cover 9 between the front surface 9A, rear surface 9B, left surface 9C, and right surface 9D, the distance between the point of application and the fulcrum is shortened, and the bending moment for the same load is reduced. As a result, by providing the screw holes 9J, 9K near the bent portions, the motor cover 9 is less likely to deform and its durability against loads can be improved.

[0059] The seat base 11 is provided with a handle 14 for opening and closing the motor cover 9. This allows the motor cover 9 to be easily opened and closed by grasping the handle 14. Furthermore, even if the vehicle shakes while traveling, grasping the handle 14 allows the body (posture) to be stabilized.

[0060] Furthermore, in a configuration in which the handle 14 is provided on the seat base 11, the load acting on the motor cover 9 when the handle 14 is grasped to open or close the motor cover 9 is distributed, compared to a configuration in which the handle is provided directly on the motor cover, thereby preventing deformation of the motor cover 9.

[0061] The motor cover 9 is formed as an openable / closable cover whose front side can be opened and closed in the vertical direction with the rear side as a fulcrum. The handle 14 has an outer grip portion 14C located on the outer side of the seat base 11 in the left-right direction and extending in the front-to-rear direction, and a front grip portion 14D located on the front side of the seat base 11 and extending in the left-to-right direction. This allows the handle 14 to be grasped from either the left or right side of the hydraulic excavator 1. The handle 14 can also be grasped from the front side.

[0062] The handle 14 is disposed rearward of the front surface 9A1 of the front portion 9A of the motor cover 9. Therefore, the handle 14 can prevent the legs (calves, etc.) of the operator sitting in the driver's seat 10 from accidentally interfering with the handle, thereby improving workability.

[0063] Furthermore, the driver's seat 10 is equipped with a slide mechanism 10A that can move the seating position in the front-rear direction. In addition, the front grip portion 14D of the handle 14 is inclined downward from the outside to the inside in the left-right direction, and is therefore positioned lower than the driver's seat 10 (moving portion of the slide mechanism 10A, seat portion 10B) that has been moved forward by the slide mechanism 10A. This makes it possible to avoid interference between the front grip portion 14D of the handle 14 and the driver's seat 10 (moving portion of the slide mechanism 10A, seat portion 10B) even when the driver's seat 10 is moved forward by the slide mechanism 10A.

[0064] Meanwhile, seat base 11 is provided with seat belt mounting portions 15, 16, a grease gun mounting portion 17, and a cup holder mounting portion 18. As a result, seat belts 19, 20 can be attached to seat base 11 using seat belt mounting portions 15, 16. A grease gun 21 can be attached using grease gun mounting portion 17. A cup holder 22 can be attached using cup holder mounting portion 18.

[0065] In the embodiment, an example has been described in which the seat base 11 is attached to the upper surface 9E of the motor cover 9 using six bolts 13, and the slide mechanism 10A of the driver's seat 10 is attached to the seat base 11 using four bolts. However, the present invention is not limited to this, and the seat base 11 may be attached to the upper surface 9E of the motor cover 9 using two to five bolts 13, or seven or more bolts, and the slide mechanism 10A of the driver's seat 10 may be attached to the seat base 11 using two, three, or five or more bolts.

[0066] In addition, in the embodiment, the mounting position of seat base 11 relative to upper surface 9E of motor cover 9 is set inside seat belt mounting portions 15, 16 near front surface 9A, rear surface 9B, left surface 9C, and right surface 9D. However, the present invention is not limited to this, and for example, the mounting position of seat base 11 relative to upper surface 9E of motor cover 9 may be set below driver's seat 10.

[0067] Furthermore, in the embodiment, the rear portion of the motor cover 9 is rotatably attached to the counterweight 5C of the revolving frame 5. However, the present invention is not limited to this, and for example, the front, left, or right portion of the motor cover 9 may be rotatably attached to the vehicle body. [Explanation of symbols]

[0068] 1. Hydraulic excavator 2 Undercarriage 3 Upper rotating body 5 Swivel frame 7 Engine (prime mover) 9 Engine cover 9A Front part 9A1 Front 9E Top part 9F Connecting member (fulcrum) 10 Driver's seat 10A Slide mechanism 11 Seat base 12 Base plate 12D, 12E Bolt insertion holes (motor cover fixing part) 12F screw hole (driver's seat fixing part) 14 Handle 14C Outer grip 14D Front grip 15,16 Seat belt attachment point (attachment point) 17 Grease gun mounting part (mounting part) 18 Cup holder mounting part (mounting part) 19,20 Seat belt (additional parts) 21 Grease gun (additional part) 22 Cup holder (additional part)

Claims

1. a self-propelled lower traveling body; an upper rotating body rotatably provided on the lower traveling body; Equipped with The upper rotating body is a pivoting frame forming a support structure; a prime mover provided on the rear side of the revolving frame; a motor cover that covers the motor in an openable and closable manner; a driver's seat provided above the engine cover; In a construction machine equipped with a seat base provided between an upper surface of the engine cover and the driver's seat for fixing the driver's seat to the upper side of the engine cover; The seat base is a driver's seat fixing portion attached to the driver's seat; a motor cover fixing portion attached to the motor cover; and A construction machine characterized in that the engine cover fixing portion of the seat base is arranged over a wider area than the driver's seat fixing portion.

2. The construction machine according to claim 1, A construction machine characterized in that a handle for opening and closing the motor cover is provided on the seat base.

3. The construction machine according to claim 2, The motor cover is formed as an openable cover whose front side can be opened and closed in the vertical direction with the rear side as a fulcrum, A construction machine characterized in that the handle comprises an outer grip portion located on the outside of the seat base in the left-right direction and extending in the front-to-rear direction, and a front grip portion located on the front side of the seat base and extending in the left-to-right direction.

4. The construction machine according to claim 3, A construction machine characterized in that the handle is arranged rearward of the front surface of the motor cover.

5. The construction machine according to claim 3, The driver's seat is provided with a slide mechanism that allows the seating position to be moved in the front-rear direction, a front gripping portion of the handle that is inclined downward from the outside to the inside in the left-right direction and is positioned lower than the driver's seat that has been moved forward by the sliding mechanism.

6. The construction machine according to claim 1, A construction machine characterized in that the seat base is provided with a mounting portion for mounting additional parts.

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