JP2024094008A - Excavator - Google Patents

Abstract

To provide a shovel capable of completely engaging a lock mechanism with a bracket.SOLUTION: A shovel 100 includes a lower traveling body 1, an upper rotating body 3, a left rear door 50L1, a bracket 90L, and a locking mechanism 70L. The locking mechanism 70L includes a hook 74 that engages with the bracket 90L when the left rear door 50L1 is closed, and a locking mechanism 75 having a key cylinder 76 that can switch between a locked state and an unlocked state of the left rear door 50L1 as the key cylinder 76 rotates. The hook 74 and the locking mechanism 75 selectively take a first state in which a lock plate 763 connected to the key cylinder 76 passes through, and a second state in which a part of the lock plate 763 interferes with the hook 74 when the key cylinder 76 rotates.SELECTED DRAWING: Figure 6

Description

This disclosure relates to an excavator equipped with a locking mechanism that secures an openable and closable door.

Patent Document 1 discloses an excavator equipped with an openable and closable door on the side of an upper rotating body. When an operator closes the door of the excavator, a hook of a locking mechanism provided on the door engages with a bracket, allowing the door to remain closed. This type of locking mechanism also includes a key cylinder that rotates when the operator inserts a key, making it possible to lock the door when it is closed.

JP 2020-20182 A

However, there are cases where the hook of the door does not hook properly onto the bracket (leaving the door half-open and not fully engaged). In this case, there is a risk that the key cylinder will not lock properly.

The present disclosure provides a shovel that allows the locking mechanism and bracket to be fully engaged.

According to one aspect of the present disclosure, there is provided a shovel that includes a lower running body, an upper rotating body rotatably mounted on the lower running body, a door provided on the upper rotating body, a bracket provided on the upper rotating body, and a locking mechanism that fixes the door to the upper rotating body, the locking mechanism including an engagement portion that engages with the bracket when the door is closed, and a locking mechanism having a key cylinder that can switch between a locked state and an unlocked state of the door as the door is closed and rotates, the engagement portion and the locking mechanism selectively taking a first state that allows the passage of a key member connected to the key cylinder when the key cylinder rotates, and a second state in which a part of the key member interferes with the engagement portion when the key cylinder rotates.

According to one embodiment of the shovel, the locking mechanism and the bracket can be fully engaged.

FIG. 1 is a left side view of a shovel as an excavator according to an embodiment. FIG. 2 is a right side view of the shovel shown in FIG. FIG. 2 is a top view showing the arrangement of components mounted on the upper rotating body. Fig. 4(A) is a perspective view of the left rear door, Fig. 4(B) is a perspective view of the right rear door, and Fig. 4(C) is a perspective view of the left front door. 5A and 5B are plan views showing the locking mechanism of the left rear door in a disengaged state and an engaged state, respectively. Fig. 6A is a perspective view partially showing a part of the configuration of the door handle, the hook and the locking mechanism in an unlocked state, and Fig. 6B is a perspective view partially showing a part of the configuration of the door handle, the hook and the locking mechanism in a locked state. Fig. 7A is a perspective view of the lock plate according to this embodiment, and Fig. 7B is a perspective view of the lock plate according to another configuration example. Fig. 8(A) is a plan view and a front view showing an unlocked state when the hook is in a locked position. Fig. 8(B) is a plan view and a front view showing a locked state when the hook is in a locked position. Fig. 8(C) is a plan view and a front view showing an unlocked state when the hook is in a non-locked position. Fig. 8(D) is a plan view and a front view showing the rotation restriction of the key cylinder when the hook is in a non-locked position.

Below, a description will be given of a mode for carrying out the present disclosure with reference to the drawings. In each drawing, the same components are given the same reference numerals, and duplicate descriptions may be omitted.

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

In the following description, the X-axis, Y-axis, and Z-axis directions are mutually perpendicular, and typically the X-axis and Y-axis directions are horizontal, 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.

As shown in Figs. 1 and 2, the excavator 100 has a lower traveling body 1, a swivel 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 swivel mechanism 2. A cabin 10 serving as a driver's cab is provided at the front left side of a swivel frame 3F that constitutes the base of the upper rotating body 3. One end of the boom 4 is attached to the center of the front of the upper rotating body 3 so that it can be raised and lowered. The arm 5 is rotatably attached to the tip of the boom 4. The bucket 6 as an end attachment is rotatably attached to the tip of the arm 5. The boom 4, the arm 5, and the bucket 6 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.

The engine 11 (see Figure 3) and components associated with the engine 11 are mounted at the rear of the upper rotating body 3.

Figure 3 is a top view showing the arrangement of the components mounted on the upper rotating body 3. In Figure 3, the top surface of the upper rotating body 3 is omitted and the house frame HF is shown by dotted lines so that the arrangement of the components mounted on the upper rotating body 3 can be seen.

The house frame HF is a framework mounted on the swivel frame 3F, and is composed of pillars CM and beam members BM. In this embodiment, the house frame HF includes a left rear pillar CML1, a left front pillar CML2, a left center pillar CML3, a right rear pillar CMR1, a right front pillar CMR2, a left rear beam member BML1, a left front beam member BML2, and a right beam member BMR.

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.

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

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 a position approximately in the center in the height direction.

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.

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.

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.

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.

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.

Openable and closable doors 50 are provided on the sides of the upper rotating 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.

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 the left rear support pillar CML1 so that it can be opened and closed. A locking mechanism 70L is attached to the left rear door 50L1 at approximately the center in the height direction. The locking mechanism 70L engages with a bracket 90L to secure the left rear door 50L1 to the upper rotating body 3.

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 the left front support pillar CML2 so that it can be opened and closed. A doorknob 80 (see FIG. 1) is attached to the left front door 50L2 at approximately the center in the height direction. The doorknob 80 is used to open and close the left front door 50L2. The doorknob 80 does not necessarily have to be provided.

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 the right rear support pillar CMR1 so that it can be opened and closed. A locking mechanism 70R is attached to the right rear door 50R1 at approximately 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.

An engine 11 is installed inside the upper rotating body 3. An exhaust gas treatment device 60 including a selective catalytic reduction system that complies with high-level exhaust gas regulations 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.

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 via the intake pipe 64.

An exhaust pipe 65 for discharging exhaust gas is connected to the engine 11. An exhaust gas treatment device 60 is installed at the downstream end of the exhaust pipe 65.

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 the 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.

As shown in FIG. 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 the right bracket 66R and the 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.

The pump chamber, located below the exhaust gas treatment device 60, contains 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 prefilter, a fuel pump, a main fuel filter, a three-way valve, and piping that connects them. The three-way valve is connected to the fuel tank TK2 via a return pipe. The pump chamber also contains a hydraulic pump HP.

Next, the door 50 will be described with reference to Figures 4 and 5. Figure 4 is a perspective view showing the door 50 in an open state. Specifically, Figure 4(A) is a perspective view of the left rear door 50L1. Figure 4(B) is a perspective view of the right rear door 50R1. Figure 4(C) is a perspective view of the left front door 50L2. Figure 5(A) is a plan view showing the disengaged state of the locking mechanism 70L of the left rear door 50L1. Figure 5(B) is a plan view showing the engaged state of the locking mechanism 70L of the left rear door 50L1.

As shown in FIG. 4(A), a bracket 90L is attached to the left central 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. As shown in FIG. 5(A), the bracket 90L has an attachment portion 91 and a catch portion 92. The attachment portion 91 extends from the left central support column CML3 in the +Y direction. The attachment portion 91 is fastened to the left central support column CML3 via a bolt (not shown). The attachment portion 91 may be welded to the left central support column CML3. The catch portion 92 extends in the -X direction from the tip of the attachment portion 91 on the +Y direction side. The catch portion 92 engages with a hook 74 of the locking mechanism 70L, which will be described later.

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 the left rear door assembly. The hinge mechanism 30 is a mechanism that holds the left rear door 50L1 on the left rear support pillar CML1 so that it can be opened and closed. The stopper mechanism 40 is a mechanism that allows the left rear door 50L1 to be maintained in an open state.

A locking mechanism 70L is attached to the left rear door 50L1 at approximately the center in the height direction. This locking mechanism 70L will be described in detail later.

As shown in FIG. 4(A), the left rear door 50L1 is configured to be openable and closable and to be kept 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.

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 is similar to the bracket 90L described above, so a description thereof will be omitted.

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, so a description thereof will be omitted.

A lock mechanism 70R is attached to the right rear door 50R1 at approximately the center in the height direction. This lock mechanism 70R is similar to the lock mechanism 70L, so a description of it will be omitted.

The right rear door 50R1 is configured to be openable and closable and to be kept open so that an operator can perform maintenance on the exhaust gas treatment device 60 (see FIG. 3) installed on the firewall FW and on 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.

As shown in FIG. 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 similar to the stopper mechanism 40 that forms the left rear door assembly, so its description is omitted.

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 the like, and to be able to keep it open. As shown in FIG. 3, the left front door 50L2 and the left rear door 50L1 form a pair of doors that open like a double door. The left front door 50L2 and the left rear door 50L1 are each provided with an engaging body and an engaged body (neither of which is shown). When the left front door 50L2 and the left rear door 50L1 are closed, the engaging body of the left front door 50L2 engages with the engaged body of the left rear door 50L1. As a result, when the left rear door 50L1 is locked to the upper rotating body 3 by the lock mechanism 70L, the left front door 50L2 is also locked to the upper rotating body 3. The engaging body of the left front door 50L2 and the engaged body of the left rear door 50L1 may be, for example, a bracket formed by bending a steel plate into an L-shape. The engaging member of the left front door 50L2 and the engaged member of the left rear door 50L1 are engaged via a buffer member such as a cushion. This can suppress or prevent rattling of the left front door 50L2 when the engaging portion of the left front door 50L2 and the engaged member 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.

Next, the lock mechanism 70L provided on the left rear door 50L1 will be described with reference to Figures 5(A) and 5(B). The lock mechanism 70L has a function of engaging the left rear door 50L1 by hooking (engaging) with the bracket 90L, and a function of locking the left rear door 50L1 by transitioning from an unlocked state to a locked state. Specifically, the lock mechanism 70L includes a housing 71, a support shaft 72, and a door handle 73.

The housing 71 is configured to be able to accommodate the door handle 73. The housing 71 has a flange 71f on its outer periphery, and is welded to the inner surface of the left rear door 50L1 via the flange 71f. The housing 71 may be fastened to the left rear door 50L1 by a bolt or the like. The housing 71 has a protruding portion 711 that protrudes toward the inside of the shovel 100 (in the -Y direction) relative to the flange 71f. The protruding portion 711 protrudes to a position adjacent to the catch portion 92 of the bracket 90L when the left rear door 50L1 is closed.

The protruding portion 711 has a rectangular ring-shaped side wall 711a that protrudes from the flange 71f side in the -Y direction, and a bottom wall 711b that is continuous with the protruding end of the side wall 711a. A recessed space 71s that is open in the +Y direction is formed inside the side wall 711a. The recessed space 71s is open to the flange 71f side and accommodates a door handle 73. The housing 71 has a support shaft 72 that runs along the up-down direction (Z direction) on the +X direction side of the recessed space 71s, and accommodates the door handle 73 in the recessed space 71s so that it can rotate around the support shaft 72. When the door handle 73 supported by the support shaft 72 is accommodated in the recessed space 71s, a clearance space is formed behind the recessed space 71s (-X direction) so that the operator's hand can enter.

The support shaft 72 is a solid member that is fixed to the top and bottom of the side wall 711a that constitutes the protruding portion 711 of the housing 71. The support shaft 72 rotatably supports the +X direction side of the door handle 73.

The door handle 73 has a box body 731 with a predetermined thickness in the Y direction. The +Y side of the box body 731 of the door handle 73 is exposed to the outside (+Y side) of the excavator 100. The door handle 73 is grasped by an operator and rotated about the support shaft 72 based on an opening operation in which the door handle 73 is pulled in the direction away from the left rear door 50L1 (+Y direction), so that the door handle 73 protrudes from the housing 71 and assumes an inclined position. In a standby state in which no opening operation is performed, the door handle 73 is housed in the recessed space 71s, and the outer surface on the +Y side is approximately flush with the flange 71f of the housing 71.

The door handle 73 is provided with a hook (engagement portion) 74 that hooks onto the bracket 90L. The hook 74 rotates away from the support shaft 72 as the door handle 73 rotates. The hook 74 includes an extension portion 741 that extends from the inside of the box body 731 toward the outside, and a roughly triangular claw portion 742 that is connected to the end of the extension portion 741. The claw portion 742 has an acute angle portion 742a that protrudes in the +X direction and the +Y direction, and has an edge portion 742b that is parallel to the side surface of the box body 731 in the -Y direction from the acute angle portion 742a toward the extension portion 741. The acute angle portion 742a is formed into a rounded corner (R-shaped).

The locking mechanism 70L and bracket 90L are engaged (the left rear door 50L1 is closed) when the edge 742b of the claw 742 hooks onto the catch 92 of the bracket 90L. In this engaged state, the edge 742b and the catch 92 extend parallel to each other over a predetermined range in the X direction and come into surface contact, allowing the locking mechanism 70L and bracket 90L to be firmly (completely) engaged.

The hook 74 is also configured to be able to oscillate elastically due to the internal structure of the door handle 73. That is, when the door handle 73 is in a standby state, the hook 74 assumes a locked position (first position) in which the edge 742b is parallel to the side surface of the box body 731 in the -Y direction. When the door handle 73 is opened in the +Y direction, the hook 74 is displaced in a direction away from the mounting portion 91 of the bracket 90L due to the internal structure of the door handle 73. As a result, the hook 74 assumes an unlocked position (second position) in which the edge 742b is inclined (non-parallel) relative to the catch portion 92.

The lock mechanism 70L also includes a locking mechanism 75 for switching the left rear door 50L1 between a locked state and an unlocked state. The locking mechanism 75 includes a key cylinder 76 that is provided on the door handle 73 and allows an operator to operate the locking and unlocking, and an engagement structure 77 that is provided on the housing 71 and can engage with the key cylinder 76 in the locked state.

Figure 6(A) is a perspective view partially showing the configuration of the door handle 73, the hook 74, and the locking mechanism 75 in the unlocked state. Figure 6(B) is a perspective view partially showing the configuration of the door handle 73, the hook 74, and the locking mechanism 75 in the locked state. Note that in Figures 6(A), 6(B), and 8(A) to 8(D), the box 731 of the door handle 73 is omitted from the illustration in order to make the invention easier to understand.

As shown in FIG. 6(A), the hook 74 has an internal block body 744 that is connected to the extension portion 741 inside the box body 731 (see FIG. 5(A)) of the door handle 73. The internal block body 744 includes a shaft hole portion 745 that is rotatably connected to the shaft 72 in the +X direction, a pin hole portion 746 into which the pin 732 is inserted at a middle position in the X direction, and a retaining protrusion (protrusion) 747 that protrudes in the -X direction.

The hook 74 can rotate around the spindle 72 by inserting the spindle 72 into the spindle hole 745.

The pin 732 inserted into the pin hole 746 is connected to the box body 731 of the door handle 73 via a connecting part (not shown). When the door handle 73 is opened in the +Y direction by an operator, the pin 732 inside the box body 731 is pulled in the +Y direction through the connecting part. This pulling of the pin 732 causes the pin hole 746 to move in the +Y direction, causing the entire hook 74 to rotate around the support shaft 72 and assume an unlocked position.

However, the door handle 73 is provided with a spring member 78 that elastically biases the claw portion 742 of the hook 74 toward the spindle 72 side (the mounting portion 91 side of the bracket 90L; the +X direction side) (see Figures 5 (A) and (B)). Therefore, when the worker stops pulling on the door handle 73, the rotated claw portion 742 of the hook 74 automatically returns to its position on the spindle 72 side due to the restoring force of the spring member 78.

The retaining projection 747 protrudes a predetermined length from the extension 741 in the -X direction. This retaining projection 747 restricts the hook 74 from coming off in the +X direction (determines the rotation limit) by contacting the periphery of the insertion hole 711h provided in the bottom wall 711b of the protruding portion 711 of the housing 71. The insertion hole 711h is a hole through which the extension 741 and the claw portion 742 of the hook 74 are inserted. The housing 71 also includes a guide piece 712 that guides the lower side of the retaining projection 747 when the door handle 73 and the hook 74 are pulled. When the hook 74 is in the locked position relative to the bracket 90L, the protruding end of the retaining projection 747 is positioned in the +X direction relative to the guide piece 712. When the hook 74 is in the unlocked position relative to the bracket 90L, the protruding end of the retaining projection 747 is positioned at a position protruding in the -X direction relative to the guide piece 712.

The key cylinder 76 includes a key insertion/exit portion 761 exposed on the side surface of the door handle 73 in the +Y direction, a frame portion 762 that rotatably supports the key insertion/exit portion 761 around the periphery of the key insertion/exit portion 761, and a lock plate (key member) 763 that is connected to the key insertion/exit portion 761. A verification mechanism (not shown) is provided between the key insertion/exit portion 761 and the lock plate 763. The verification mechanism rotates the key insertion/exit portion 761 and the lock plate 763 together when the type of the key inserted by the worker matches that of the key (not shown), and conversely, keeps the key insertion/exit portion 761 and the lock plate 763 from rotating when the type of the key does not match that of the key. A well-known configuration may be applied to this verification mechanism.

Figure 7 (A) is a perspective view showing a lock plate 763 according to this embodiment. Figure 7 (B) is a perspective view showing a lock plate 764 according to another configuration example. As shown in Figure 7 (A), the lock plate 763 has a plate body 763a protruding from the key insertion/reception portion 761, and a convex piece (convex portion) 763b provided on the protruding end of the plate body 763a. The convex piece 763b is molded integrally with the plate body 763a by bending the plate body 763a.

In the unlocked state, the plate body 763a protrudes from the key insertion/exit portion 761 in the +X direction. The plate body 763a has an insertion hole 763h into which the key insertion/exit portion 761 and the verification mechanism are inserted, and a notch 763i that is connected to the insertion hole 763h and engages with the verification mechanism. This allows the plate body 763a to rotate together with the verified verification mechanism and the key insertion/exit portion 761. The protruding piece 763b is connected to the lower side (-Z direction side) at the protruding end on the +X direction side of the plate body 763a. The protruding piece 763b protrudes slightly on the +Y direction side perpendicular to the surface direction of the plate body 763a. The plate body 763a and the protruding piece 763b rotate around the key cylinder 76 within a predetermined angle range (for example, 90°) as the key cylinder 76 rotates.

Note that the lock plate 763 is not limited to the above configuration and can have various configurations. For example, as shown in FIG. 7(B), the lock plate 764 may have a configuration in which a cylindrical protrusion 764b protrudes short from the protruding end in the +X direction and -Z direction of a plate body 764a having an insertion hole 764h and a notch 764i. The protrusion 764b may be molded integrally with the plate body 764a, or may be formed separately and fixed by appropriate fixing means such as welding or screwing.

The other of the locking mechanism parts 75, the engagement structure 77, protrudes in the +Y direction from the bottom wall 711b of the protruding part 711 of the housing 71, as shown in FIG. 6(A). The engagement structure 77 may be formed integrally with the protruding part 711. For example, the engagement structure 77 has a concave shape in a plan view, with a wall part 771 in the +X direction, a wall part 772 in the -X direction, and a bridging wall part 773 bridging between the walls 771 and 772.

In a plan view, the engagement structure 77 protrudes in the +Y direction from the bottom wall 711b of the housing 71 further than the lock plate 763 when the door handle 73 is housed in the housing 71. The +X wall 771 has a notch 771a, while the -X wall 772 does not have a notch 771a. The notch 771a allows the plate body 763a to pass when the lock plate 763 rotates. When the lock plate 763 is inserted into the engagement structure 77 through the notch 771a, its rotation is restricted by the -X wall 772. In this inserted state, the bridge wall 773 overlapping the plate body 763a prevents the lock plate 763 from coming off in the +Y direction. In other words, the locking mechanism 75 can form a locked state by the key cylinder 76 and the engagement structure 77.

When an operator closes the left rear door 50L1, the lock mechanism 70L configured as described above transitions from the state in which the door handle 73 is open in FIG. 5(A) to the state in which the door handle 73 is closed in FIG. 5(B). At this time, the hook 74 basically operates to climb over the catch portion 92 of the bracket 90L, and the hook 74 gets caught in the catch portion 92. The hook 74 and the catch portion 92 then come into surface contact with each other, resulting in a completely engaged state, which firmly prevents the hook 74 from coming off.

However, as described above, the hook 74 is elastically biased in the +X direction against the door handle 73 by the spring member 78. For example, if the door handle 73 returns to the housed state in the housing 71 while the hook 74 is in the unlocked position, the acute angle portion 742a of the hook 74 may come into contact with the protruding end of the catch portion 92, and the unlocked position may continue (see the two-dot chain line in FIG. 5(B)). When the hook 74 continues to be in the unlocked position, the edge portion 742b of the hook 74 is inclined relative to the catch portion 92, which is the so-called half-open door state. In the conventional locking mechanism, even if the hook is in the unlocked position (half-open door state) and the key cylinder is engaged with the engagement structure, the hook may come off the catch portion, causing the door to open.

The locking mechanism 70L according to this embodiment is structured to prohibit the locking mechanism 75 from transitioning from an unlocked state to a locked state when the hook 74 is in the unlocked position. Specifically, when the hook 74 is in the unlocked position, the convex piece 763b of the key cylinder 76 can interfere with the retaining protrusion 747. In other words, the locking mechanism 70L prevents the key cylinder 76 from rotating due to the interference between the retaining protrusion 747 and the convex piece 763b, thereby notifying the operator that the hook 74 is in the unlocked position (a half-open door). This configuration will be described below with reference to Figures 8(A) to 8(D).

Figure 8 (A) is a plan view and a front view showing the unlocked state when the hook 74 is in the locked position. Figure 8 (B) is a plan view and a front view showing the locked state when the hook 74 is in the locked position. Figure 8 (C) is a plan view and a front view showing the unlocked state when the hook 74 is in the unlocked position. Figure 8 (D) is a plan view and a front view showing the rotation restriction of the key cylinder 76 when the hook 74 is in the unlocked position.

As shown in FIG. 8 (A), in the unlocked state, the locking mechanism 75 of the lock mechanism 70L causes the lock plate 763 to protrude in the +X direction from the key cylinder 76. Meanwhile, in the locked position, the claw portion 742 of the hook 74 is hooked in parallel to the catch portion 92. In this locked position, the anti-slip projection 747 of the hook 74 contacts the bottom wall 711b of the housing 71 to restrict the rotation of the hook 74. In this case, the anti-slip projection 747 is located on the +X direction side of the guide piece 712 of the housing 71 (it does not protrude from the guide piece 712 in the -X direction).

Therefore, as shown in FIG. 8(B), when an operator rotates the key cylinder 76 of the locking mechanism 75, the lock plate 763 can rotate upward (+Z direction) and backward (-X direction). At this time, the convex piece 763b displaces following the rotation of the plate body 763a without interfering with other components of the door handle 73 or the hook 74. The convex piece 763b waits outside and adjacent to the wall portion 771 with the plate body 763a entering the engagement structure 77 from the notch 771a of the wall portion 771 in the +X direction. Therefore, the key cylinder 76 and the engagement structure 77 can form a good locked state.

In contrast, as shown in FIG. 8(C), for example, when the acute angled portion 742a of the claw portion 742 comes into contact with the protruding end of the catch portion 92, the lock mechanism 70L remains in the unlocked position. In the unlocked position, the retaining protrusion 747 of the hook 74 protrudes in the -X direction beyond the guide piece 712 of the housing 71. In addition, in the unlocked state, the key cylinder 76 has the lock plate 763 protruding in the +X direction from the key cylinder 76, and the protruding piece 763b protruding in the +Y direction.

As shown in FIG. 8(D), when an operator rotates the key cylinder 76 of the locking mechanism 75, the lock plate 763 rotates upward (in the +Z direction), and at this time, the convex piece 763b interferes with the retaining protrusion 747 of the hook 74. In other words, when the convex piece 763b comes into contact with the retaining protrusion 747, the key insertion/exit portion 761 and the lock plate 763 cannot rotate any further. As a result, the operator can recognize that the hook 74 is in the unlocked position based on the inability to rotate the key cylinder 76. The operator can put the hook 74 into the locked position by performing an operation such as reclosing the left rear door 50L1, and then put the locking mechanism 75 into the locked state.

As described above, the lock mechanism 70L according to this embodiment can selectively take a first state in which the lock plate 763 is allowed to pass, and a second state in which the convex piece 763b interferes with the hook 74 when the key cylinder 76 is rotated. In the first state, if the hook 74 and the lock plate 763 do not interfere with each other, the positions of the hook 74 and the lock plate 763 may be arbitrarily positioned. Similarly, in the second state, if the hook 74 and the lock plate 763 interfere with each other, the positions of the hook 74 and the lock plate 763 may be arbitrarily positioned.

When the engagement between the hook 74 and the bracket 90L is insufficient (the door is half-open), the protruding piece 763b of the locking mechanism 70L interferes with the hook 74, making it impossible to switch the left rear door 50L1 from an unlocked state to a locked state. This allows the operator to take measures such as reclosing the left rear door 50L1. The excavator 100 ensures that the left rear door 50L1 is closed, preventing the left rear door 50L1 from opening accidentally during work, etc. It is to be noted that the configuration of the locking mechanism 70L can of course also be applied to the locking mechanism 70R provided on the right rear door 50R1.

The hook 74 can be easily switched between a first state in which the lock plate 763 is allowed to pass and a second state in which the lock plate 763 is prevented from passing due to interference by displacing between the locked and unlocked positions. Furthermore, the lock mechanism 70L has a protruding piece 763b protruding in a direction perpendicular to the surface direction of the plate body 763a, so that the interference between the protruding piece 763b and the hook 74 can be easily formed.

Furthermore, the locking mechanism 70L has a protrusion 747 on the hook 74 that prevents the hook 74 from coming loose by hooking onto the bottom wall 711b of the housing 71, and this protrusion 747 is adapted to interfere with the lock plate 763. This allows the configuration inside the housing 71 to be simplified, resulting in effects such as lower manufacturing costs and improved assembly.

The locking mechanism 70L according to the present invention is not limited to the above embodiment, and various modifications are possible. For example, the locking mechanism 70L in the above embodiment is configured to include a convex piece 763b (convex portion) on the locking plate 763 of the locking mechanism section 75. However, the locking mechanism 70L is not limited to this, and may include a convex portion on the hook 74, for example. The convex portion can interfere with the locking plate 763 by protruding from the hook 74 in the unlocked position toward the locking plate 763 (-Y direction side).

In the above embodiment, the hook 74, which is a single member, is used as the engagement portion of the present invention. However, the engagement portion is not limited to a single member, and may be configured by assembling multiple members. For example, the lock mechanism 70L may have one or more gears that transmit the rotation of the hook 74, and the key cylinder 76 may restrict the rotation of the lock plate 763 by a predetermined gear in the unlocked position.

For example, the locking mechanism 70L may be configured to move the hook 74, which is in contact (interfering) with the locking mechanism 70L from the unlocked position to the locked position based on the rotation of the key cylinder 76 by the operator. As an example, the locking mechanism 70L may be configured to have an inclined edge on the convex piece 763b, and the edge may push out the anti-removal protrusion 747 based on the upward movement of the convex piece 763b (in the +Z direction). This allows the hook 74 to rotate toward the locked position and the claw portion 742 to hook (engage) with the catch portion 92. Then, when the hook 74 is in the locked position, the locking mechanism 75 may be switched from the unlocked state to the locked state by the rotation of the key cylinder 76.

The shovel 100 according to the embodiment disclosed herein is illustrative in all respects and not restrictive. The embodiment may be modified and improved in various ways without departing from the spirit and scope of the appended claims. The matters described in the above embodiments may be configured in other ways as long as they are not inconsistent, and may be combined as long as they are not inconsistent.

1 Lower traveling body 3 Upper rotating body 50L1 Left rear door (door)
70L Lock mechanism 71 Housing 711h Insertion hole 72 Support shaft 74 Hook (engagement portion)
742b Edge 747 Anti-slip protrusion (protrusion)
75 Locking mechanism 76 Key cylinder 761 Key insertion/removal section 763, 764 Lock plate (key member)
763b Convex piece (convex part)
90L Bracket 92 Catch part 100 Shovel

Claims (8)

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 lock mechanism for fixing the door to the upper rotating body,
The locking mechanism includes:
an engagement portion that engages with the bracket when the door is closed;
a locking mechanism having a key cylinder that can switch between a locked state and an unlocked state of the door by rotating the key cylinder when the door is closed,
The engagement portion and the locking mechanism portion are
a first state in which the key cylinder is rotated to allow passage of a key member connected to the key cylinder;
a second state in which a part of the key member interferes with the engagement portion when the key cylinder is rotated;
Shovel. In the second state, a part of the key member interferes with the engagement portion, thereby making it impossible to switch from the unlocked state to the locked state.
The shovel according to claim 1. In the second state, a part of the key member interferes with the engagement portion to move the engagement portion, thereby engaging the bracket with the engagement portion, and the locking mechanism transitions to the first state, thereby making it possible to switch from the unlocked state to the locked state.
The shovel according to claim 1. the engaging portion, when in contact with the bracket, assumes a first position in which a catch portion of the bracket and an edge portion of the engaging portion are hooked in parallel, and a second position in which the edge portion of the engaging portion is hooked at an angle relative to the catch portion;
The first state is a case of the first posture, and the second state is a case of the second posture.
A shovel according to any one of claims 1 to 3. the key member is a lock plate that is rotatable integrally with a key insertion/removal portion of the key cylinder,
The lock plate has a protrusion that can interfere with the engagement portion in the second state.
A shovel according to any one of claims 1 to 3. The protrusion protrudes in a direction perpendicular to the surface direction of the lock plate by bending the plate body of the lock plate.
The shovel according to claim 5. The engagement portion has a protrusion that can interfere with the key member in the second state.
A shovel according to any one of claims 1 to 3. The locking mechanism includes:
a housing capable of accommodating the engagement portion and the locking mechanism portion;
a support shaft that supports the engagement portion rotatably inside the housing,
the engaging portion is exposed through a hole in the housing and engages with the bracket,
The protrusion is hooked on the housing to prevent the engagement portion from coming off.
The shovel according to claim 7.

Images