Excavator

Abstract

To provide a shovel capable of suppressing or preventing contact of a lock mechanism with a bracket.SOLUTION: An excavator 100 according to an embodiment of the present invention has a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, a door provided on the upper revolving body, a bracket provided on the upper revolving body, and a lock mechanism for fixing the door to the upper revolving body. The locking mechanism has a housing attached to the door, and an engaging portion rotatably mounted to the housing and engaged with the bracket when the door is closed. The housing has a recess recessed toward the door at a position facing the bracket when the door is closed.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a shovel. [Background technology]

[0002] Conventionally, there is known an excavator equipped with a locking mechanism that locks a door provided on an upper rotating body in a closed state (see, for example, Patent Document 1). The locking mechanism is attached to the door and locks the door to the upper rotating body by engaging with a bracket provided on the upper rotating body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-268684 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the locking mechanism protrudes further inward than the inner surface of the door, the locking mechanism may come into contact with the bracket when the door is slammed shut.

[0005] Therefore, it is desirable to provide a shovel that can suppress or prevent the locking mechanism from coming into contact with the bracket. [Means for solving the problem]

[0006] A shovel according to an embodiment of the present invention includes a lower traveling body, an upper rotating body rotatably mounted on the lower traveling body, a door provided on the upper rotating body, a bracket provided on the upper rotating body, and a locking mechanism for fixing the door to the upper rotating body, and the locking mechanism is attached to the door. , an opening is provided and protruding from the opening; andThe housing has an engaging portion that is rotatably attached to the housing and engages with the bracket when the door is closed, and the housing has a recessed portion that is recessed on the side of the door at a position opposite the bracket when the door is closed. [Effects of the Invention]

[0007] The above-described means provide a shovel that can suppress or prevent the locking mechanism from coming into contact with the bracket. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a left side view of a shovel according to an embodiment. [Figure 2] FIG. 2 is a right side view of the excavator of FIG. 1. [Figure 3] FIG. [Figure 4] FIG. 2 is a perspective view showing the door in an open state. [Figure 5] FIG. [Figure 6] FIG. 2 is a perspective view of the right rear door as seen from inside the upper rotating body. [Figure 7] FIG. 2 is a perspective view of the right rear door as seen from outside the upper rotating body. [Figure 8] 10A and 10B are diagrams illustrating the operation of the locking mechanism when the door is closed. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0010] Fig. 1 is a left side view of a shovel 100 as an excavator according to an embodiment. Fig. 2 is a right side view of the shovel 100 shown in Fig. 1.

[0011] In the following description, the X-axis, Y-axis, and Z-axis directions are directions perpendicular to one another, and typically, the X-axis and Y-axis directions are horizontal directions, and the Z-axis direction is vertical. The X-axis direction is the front-to-rear direction of the shovel 100, with the front side being the +X direction and the rear side being the -X direction. The Y-axis direction is the left-to-right width direction of the shovel 100, with the left side being the +Y direction and the right side being the -Y direction. The Z-axis direction is the height direction of the shovel 100, with the upper side being the +Z direction and the lower side being the -Z direction.

[0012] As shown in FIGS. 1 and 2 , an excavator 100 has a lower traveling body 1, a slewing mechanism 2, an upper rotating body 3, a boom 4, an arm 5, and a bucket 6. The upper rotating body 3 is rotatably mounted on the lower traveling body 1 via the slewing mechanism 2. A cabin 10 serving as a driver's cab is provided at the front left portion of a rotating frame 3F that forms the base of the upper rotating body 3. One end of a boom 4 is rotatably attached to the center of the front portion of the upper rotating body 3. An arm 5 is rotatably attached to the tip of the boom 4. A bucket 6 serving as an end attachment is rotatably attached to the tip of the arm 5. The boom 4, arm 5, and bucket 6 together constitute an excavation attachment, which is an example of an attachment. Instead of the bucket 6, another end attachment such as a breaker or a crusher may be attached to the tip of the arm 5.

[0013] An engine 11 (see FIG. 3) and components associated with the engine 11 are mounted on the rear of the upper rotating body 3.

[0014] Fig. 3 is a top view showing the arrangement of the components mounted on the upper rotating body 3. In Fig. 3, the top surface of the upper rotating body 3 is omitted from the illustration so that the arrangement of the components mounted on the upper rotating body 3 can be seen, and the house frame HF is indicated by a dotted line.

[0015] The house frame HF is a framework mounted on the revolving frame 3F and is composed of columns CM, beam members BM, etc. In this embodiment, the house frame HF includes a left rear column CML1, a left front column CML2, a left center column CML3, a right rear column CMR1, a right front column CMR2, a left rear beam member BML1, a left front beam member BML2, and a right beam member BMR.

[0016] The left rear support column CML1 is provided on the left side of the upper rotating body 3. Specifically, the left rear support column CML1 is provided adjacent to the front side of the counterweight CW.

[0017] The front left support column CML2 is provided on the left side of the upper rotating body 3. Specifically, the front left support column CML2 is provided adjacent to the rear side of the cabin 10.

[0018] The left center support column CML3 is provided on the left side of the upper rotating body 3. Specifically, the left center support column CML3 is provided between the left rear support column CML1 and the left front support column CML2. A bracket 90L is attached to the left center support column CML3 at approximately the center in the height direction.

[0019] The right rear support column CMR1 is provided on the right side of the upper rotating body 3. Specifically, the right rear support column CMR1 is provided adjacent to the front side of the counterweight CW.

[0020] The right front support column CMR2 is provided on the right side of the upper rotating body 3. Specifically, the right front support column CMR2 is provided adjacent to the rear side of the hydraulic oil tank TK1. A bracket 90R is attached to the right front support column CMR2 at approximately the center in the height direction.

[0021] The left rear beam member BML1 is provided on the left side of the upper rotating body 3. Specifically, the left rear beam member BML1 is provided so as to be supported by the left rear support column CML1 and the left central support column CML3. The left rear beam member BML1 is fastened to the left rear support column CML1 and the left central support column CML3 via bolts BTa and BTb.

[0022] The left front beam member BML2 is provided on the left side of the upper rotating body 3. Specifically, the left front beam member BML2 is provided so as to be supported by the left front support column CML2 and the left central support column CML3. The left front beam member BML2 is fastened to the left front support column CML2 and the left central support column CML3 via bolts BTa and BTb.

[0023] The right beam member BMR is provided on the right side of the upper rotating body 3. Specifically, the right beam member BMR is provided so as to be supported by the right rear support column CMR1 and the right front support column CMR2. The right beam member BMR is fastened to the right rear support column CMR1 and the right front support column CMR2 via bolts BTa and BTb.

[0024] Openable and closable doors 50 are provided on the side surfaces of the upper revolving body 3. In this embodiment, the doors 50 include a left rear door 50L1, a left front door 50L2, and a right rear door 50R1.

[0025] The left rear door 50L1 is provided on the left side of the upper rotating body 3. Specifically, the left rear door 50L1 is attached to a left rear support pillar CML1 so as to be able to open and close. A locking mechanism 70L is attached to the left rear door 50L1 at a position approximately in the center in the height direction. The locking mechanism 70L secures the left rear door 50L1 to the upper rotating body 3 by engaging with a bracket 90L.

[0026] The left front door 50L2 is provided on the left side surface of the upper rotating body 3. Specifically, the left front door 50L2 is attached to a left front support pillar CML2 so as to be able to open and close. A door knob 80 (see FIG. 1) is attached to the left front door 50L2 at a position approximately in the center in the height direction. The door knob 80 is used to open and close the left front door 50L2. The door knob 80 does not necessarily have to be provided.

[0027] The right rear door 50R1 is provided on the right side of the upper rotating body 3. Specifically, the right rear door 50R1 is attached to a right rear support pillar CMR1 so as to be able to open and close. A locking mechanism 70R is attached to the right rear door 50R1 at a position approximately in the center in the height direction. The locking mechanism 70R engages with a bracket 90R to fix the right rear door 50R1 to the upper rotating body 3.

[0028] An engine 11 is installed inside the upper rotating body 3. An exhaust gas treatment device 60 including a selective catalytic reduction system is installed near the engine 11. A cooling fan 12 is provided near the engine 11, and a heat exchanger 13 is installed adjacent to the cooling fan 12.

[0029] An air cleaner 63 is installed on the +X side of the heat exchanger 13. The air cleaner 63 is connected to the engine 11 via an intake pipe 64. This is so that air that has passed through the air cleaner 63 is supplied to the engine 11 through the intake pipe 64.

[0030] An exhaust pipe 65 for discharging exhaust gas is connected to the engine 11. At the downstream end of the exhaust pipe 65, an exhaust gas treatment device 60 that complies with stricter exhaust gas regulations is installed.

[0031] A hydraulic oil tank TK1 that stores hydraulic oil used in the hydraulic system is disposed on the +X side of the exhaust gas treatment device 60. A fuel tank TK2 that stores fuel is disposed on the +X side of the hydraulic oil tank TK1. A urea water tank TK3 that stores urea water solution used by the exhaust gas treatment device 60 is disposed on the +X side of the fuel tank TK2. A cover CV is attached above the +X side of the urea water tank TK3. A locking mechanism 70C is attached to the cover CV.

[0032] 3, the boom 4 is rotatably supported by a boom support bracket 66 that is firmly fixed to the front center of the revolving frame 3F of the upper revolving body 3. Specifically, the boom 4 is sandwiched between a right bracket 66R and a left bracket 66L of the boom support bracket 66, and is supported by a boom foot pin BP that penetrates the right bracket 66R, the boom 4, and the left bracket 66L.

[0033] The pump chamber, located below the exhaust gas treatment device 60, houses various components of a fuel supply system for supplying fuel to the engine 11. The various components of the fuel supply system include a fuel pre-filter, a fuel pump, a main fuel filter, a three-way valve, and piping that connects these components. The three-way valve is connected to the fuel tank TK2 via a return piping. The pump chamber also houses a hydraulic pump HP.

[0034] Next, the door 50 will be described with reference to FIGS. 4 to 7. FIG. 4 is a perspective view showing the door 50 in an open state. Specifically, FIG. 4 includes FIGS. 4(A) to 4(C). FIG. 4(A) is a perspective view of the left rear door 50L1. FIG. 4(B) is a perspective view of the right rear door 50R1. FIG. 4(C) is a perspective view of the left front door 50L2. FIG. 5 is a top view of the right rear door 50R1, showing the positional relationship between the bracket 90R and the locking mechanism 70R. FIG. 6 is a perspective view of the right rear door 50R1 as seen from inside the upper rotating body 3, showing the positional relationship between the bracket 90R and the locking mechanism 70R. FIG. 7 is a perspective view of the right rear door 50R1 as seen from outside the upper rotating body 3.

[0035] As shown in Fig. 4(A), a bracket 90L is attached to the left center support column CML3 at approximately the center in the height direction. The bracket 90L is formed, for example, by bending a steel plate into an L shape. The bracket 90L is similar to the bracket 90R, which will be described later, and therefore its description will be omitted.

[0036] As shown in FIG. 4(A), the left rear door 50L1 is attached to the left rear support pillar CML1 via a hinge mechanism 30 and a stopper mechanism 40. The left rear door 50L1, the hinge mechanism 30, and the stopper mechanism 40 constitute a left rear door assembly. The hinge mechanism 30 is a mechanism that holds the left rear door 50L1 relative to the left rear support pillar CML1 so that it can be opened and closed. The stopper mechanism 40 is a mechanism that enables the left rear door 50L1 to be maintained in an open state.

[0037] A lock mechanism 70L is attached to the left rear door 50L1 at approximately the center in the height direction. The lock mechanism 70L is similar to the lock mechanism 70R described later, and therefore a description thereof will be omitted.

[0038] 4(A), the left rear door 50L1 is configured to be openable and closable and to be able to remain open so that an operator can perform maintenance on the heat exchanger 13, the battery 14, etc. The heat exchanger 13 includes, for example, a radiator 13A, an oil cooler 13B, a fuel cooler 13C, an intercooler 13D, an air conditioner condenser 13E, and a reserve tank 13F.

[0039] As shown in FIG. 4(B), a bracket 90R is attached to the right front support column CMR2 at approximately the center in the height direction. The bracket 90R is formed, for example, by bending a steel plate into an L-shape. The bracket 90R has an attachment portion 91 and a locking portion 92 (see FIGS. 5 and 6). The attachment portion 91 extends in the -Y direction from the right front support column CMR2. The attachment portion 91 is fastened to the right front support column CMR2 via a bolt BT1. The attachment portion 91 may be welded to the right front support column CMR2. The locking portion 92 extends in the -X direction from the tip of the attachment portion 91 on the -Y direction side. An engagement claw 73 of a locking mechanism 70R, which will be described later, engages with the locking portion 92. The vertical length H1 of the locking portion 92 may be shorter than the vertical length H2 of the housing 71.

[0040] As shown in Figure 4(B), the right rear door 50R1, like the left rear door 50L1, is attached to the right rear support pillar CMR1 via a hinge mechanism 30 and a stopper mechanism 40. The right rear door 50R1, the hinge mechanism 30, and the stopper mechanism 40 form a right rear door assembly. The hinge mechanism 30 and the stopper mechanism 40 that form the right rear door assembly are similar to the hinge mechanism 30 and the stopper mechanism 40 that form the left rear door assembly, and therefore a description thereof will be omitted.

[0041] A lock mechanism 70R is attached to the right rear door 50R1 at approximately the center in the height direction. The lock mechanism 70R has a housing 71, a central shaft 72, an engaging claw 73, a biasing spring 74, and a rotating lever 75 (see FIGS. 5 to 7).

[0042] The housing 71 is welded to the right rear door 50R1. Specifically, the housing 71 has a flange 71f on its outer periphery, and the flange 71f is welded to the inner surface of the right rear door 50R1. The housing 71 may be fastened to the right rear door 50R1 via bolts. The housing 71 has a recessed portion 71a. The recessed portion 71a is provided in a position facing the locking portion 92 of the bracket 90R when the right rear door 50R1 is closed. The recessed portion 71a has a recessed shape toward the right rear door 50R1. A surface 71b of the recessed portion 71a facing the locking portion 92 is parallel to a surface 92a of the locking portion 92 facing the recessed portion 71a. A step D of the recessed portion 71a is preferably at least half the thickness T of the locking portion 92, and more preferably at least the thickness T of the locking portion 92. A gap G between the surface 71b of the recessed portion 71a and the surface 92a of the locking portion 92 is preferably at least twice the thickness T of the locking portion 92. Alternatively, the gap G may be, for example, three times the thickness T of the locking portion 92 or less. The surface 71b of the recessed portion 71a may be an inclined surface that is inclined at a predetermined angle with respect to the surface 92a of the locking portion 92.

[0043] The central axis 72 extends in the height direction within the housing 71 .

[0044] The engagement claw 73 is provided rotatable around a central shaft 72. The engagement claw 73 engages with the lock portion 92 when the right rear door 50R1 is closed. This fixes the right rear door 50R1 to the upper rotating body 3 in the closed state.

[0045] The biasing spring 74 biases the engaging claw 73 toward the position where it engages with the locking portion 92 .

[0046] The rotating lever 75 is operated to move the engagement claw 73 in a direction to release the engagement state with the lock portion 92. A keyhole 75a is provided in the rotating lever 75. The operation of the rotating lever 75 can be disabled by inserting a key (not shown) into the keyhole 75a and rotating it in a first direction (for example, clockwise). The operation of the rotating lever 75 can be enabled by inserting a key into the keyhole 75a and rotating it in a second direction (for example, counterclockwise) that is opposite to the first direction. In this way, the rotating lever 75 can be switched between enabled and disabled operation.

[0047] As shown in Fig. 4(B), the right rear door 50R1 is configured to be openable and closable and to be able to remain open so that an operator can perform maintenance on the exhaust gas treatment device 60 (see Fig. 3) installed on the firewall FW and the components installed in the pump room below the firewall FW. The components installed in the pump room include, for example, the fuel pre-filter 16, the engine oil filter 17, the main fuel filter 18, and the pilot filter 19.

[0048] As shown in Figure 4(C), the left front door 50L2, like the left rear door 50L1, is attached to the left front support pillar CML2 via a hinge mechanism 30 and a stopper mechanism 40. The left front door 50L2, the hinge mechanism 30, and the stopper mechanism 40 form a left front door assembly. The stopper mechanism 40 that forms the left front door assembly is the same as the stopper mechanism 40 that forms the left rear door assembly, so its description will be omitted.

[0049] As shown in FIG. 4(C), the left front door 50L2 is configured to be openable and closable so that an operator can perform maintenance on the air cleaner 63 and other components, and to be able to maintain the door in an open state. As shown in FIG. 3, the left front door 50L2 and the left rear door 50L1 form a pair of double-door doors. The left front door 50L2 and the left rear door 50L1 each have an engaging portion and an engaged portion (neither of which is shown). When the left front door 50L2 and the left rear door 50L1 are closed, the engaging portion of the left front door 50L2 engages with the engaged portion of the left rear door 50L1. As a result, when the left rear door 50L1 is locked to the upper rotating structure 3 by the lock mechanism 70L, the left front door 50L2 is also locked to the upper rotating structure 3. The engaging portion of the left front door 50L2 and the engaged portion of the left rear door 50L1 may be, for example, a bracket formed by bending a steel plate into an L shape. The engaging portion of the left front door 50L2 and the engaged portion of the left rear door 50L1 are engaged via a buffer member such as a cushion. This reduces or prevents rattling of the left front door 50L2 when the engaging portion of the left front door 50L2 and the engaged portion of the left rear door 50L1 are engaged. The left front door 50L2 may also have a locking mechanism, similar to the left rear door 50L1 and the right rear door 50R1.

[0050] Next, referring to FIG. 8, the operation of the lock mechanism 70R when the right rear door 50R1 is closed will be described. Note that the operation of the left rear door 50L1 is the same as that of the right rear door 50R1, and therefore its description will be omitted. FIG. 8 is a diagram illustrating the operation of the lock mechanism 70R when the right rear door 50R1 is closed. Specifically, FIG. 8 includes FIGS. 8(A) to 8(C). FIG. 8(A) is a top view showing the state immediately before the right rear door 50R1 is closed. FIG. 8(B) is a top view showing the state in which the engagement claw 73 abuts against the lock portion 92 of the bracket 90R. FIG. 8(C) is a top view showing the state immediately after the right rear door 50R1 has been forcefully closed.

[0051] When the worker begins to close the right rear door 50R1, the engaging claw 73 approaches the locking portion 92, as shown in FIG. 8A. Then, when the worker further closes the right rear door 50R1, the engaging claw 73 comes into contact with the locking portion 92, as shown in FIG. 8B. If the worker then forcefully closes the right rear door 50R1, the right rear door 50R1 may be distorted further inward on the upper rotating body 3 than the position where it is locked by the locking mechanism 70R, as shown in FIG. 8C. In this case, there is a risk of contact between the housing 71 attached to the right rear door 50R1 and the locking portion 92. However, in the locking mechanism 70R according to this embodiment, the housing 71 has a recessed portion 71a recessed toward the right rear door 50R1 at a position facing the locking portion 92 when the right rear door 50R1 is closed. As a result, the distortion of the right rear door 50R1 toward the upper rotating body 3 can be absorbed by the gap G between the surface 71b of the recessed portion 71a and the surface 92a of the locking portion 92, thereby suppressing or preventing the housing 71 from coming into contact with the locking portion 92. As a result, damage to the locking mechanism 70R and the bracket 90R can be prevented. Furthermore, even if the bracket 90R is attached to the outside of the upper rotating body 3 or other cases where the attachment accuracy of the bracket 90R to the right front support column CMR2 is poor, the housing 71 has the recessed portion 71a, thereby suppressing or preventing the housing 71 from coming into contact with the locking portion 92.

[0052] In the above embodiment, the engagement claw 73 is an example of an engagement portion. The left rear support column CML1 and the right rear support column CMR1 are an example of a first support column, and the left center support column CML3 and the right front support column CMR2 are an example of a second support column. The surface 71b of the recessed portion 71a is an example of a first surface, and the surface 92a of the locking portion 92 is an example of a second surface.

[0053] The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above-described embodiments. Various modifications, substitutions, etc. may be applied to the above-described embodiments without departing from the scope of the present invention. Furthermore, features described separately may be combined unless technical contradictions arise. [Explanation of symbols]

[0054] 1 Undercarriage 2. Swivel mechanism 3 Upper rotating body 3F Swivel frame 4. Boom 5 Arm 6 buckets 10 Cabins 11 Engine 12 Cooling fan 13 Heat exchange equipment 13A Radiator 13B Oil cooler 13C Fuel Cooler 13D Intercooler 13E Air Conditioner Condenser 13F reserve tank 14 Battery 16 Fuel pre-filter 17 Engine oil filter 18 Fuel main filter 19 Pilot Filter 30 Hinge mechanism 40 Stopper mechanism 50 doors 50L1 Left rear door 50L2 left front door 50R1 Right rear door 60 Exhaust gas treatment equipment 63 Air cleaner 64 Intake pipe 65 Exhaust pipe 66 Boom support bracket 66L left side bracket 66R right side bracket 70C locking mechanism 70L locking mechanism 70R locking mechanism 71 Case 71a Recess 71b side 71f flange 72 Central axis 73 Engagement claw 74 bias spring 75 Rotating lever 75a Keyhole 80 Doorknob 90L Bracket 90R bracket 91 Mounting part 92 Rock Club 92a side 100 Shovel D. Step G Gap TK1 hydraulic oil tank TK2 fuel tank TK3 urea tank

Claims

1. a lower running body; an upper rotating body rotatably mounted on the lower traveling body; a door provided on the upper rotating body; A bracket provided on the upper rotating body; a locking mechanism that fixes the door to the upper rotating body; and The locking mechanism is a housing attached to the door and having an opening; an engaging portion that protrudes from the opening, is rotatably attached to the housing, and engages with the bracket when the door is closed; and The housing has a recessed portion recessed on the door side at a position facing the bracket when the door is closed. Shovel.

2. The step of the recessed portion is equal to or greater than half the thickness of the bracket. The shovel according to claim 1.

3. the recessed portion has a first surface facing the bracket, the bracket has a second surface facing the recessed portion, The gap between the first surface and the second surface is at least twice the thickness of the bracket. The shovel according to claim 1 or 2.

4. a first support column provided on a first side of a side surface of the upper rotating body, and a second support column provided on a second side of the side surface, The door is pivotally attached to the first support post, The bracket is fixed to the second support. The shovel according to any one of claims 1 to 3.

5. The recessed portion is provided over the entire position facing the bracket when the door is closed. The shovel according to any one of claims 1 to 4.

6. The vertical length of the recessed portion is longer than the vertical length of the bracket, The shovel according to any one of claims 1 to 5.

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