Construction machine
By installing upper side insertion holes in the cab and door hinge side walls of the construction machinery, the problems of poor operator operability and contact hazards are solved, thereby improving convenience and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HITACHI CONSTRUCTION MACHINERY CO LTD
- Filing Date
- 2022-01-26
- Publication Date
- 2026-05-15
AI Technical Summary
In construction machinery, operators must avoid the wiring harness when operating the release lever to open the holding lock, which results in poor operability and contact hazards, especially the risk that the wiring harness may be accidentally grabbed or broken.
First and second insertion holes are provided on the hinge side wall of the cab and door to allow the wiring harness to be laid from the first space to the second space. The insertion holes are located above the open retaining lock release lever to ensure that the wiring harness is not easily exposed and to reduce the risk of contact.
It improves operator convenience, reduces the risk of operator contact with the wiring harness, and avoids the possibility of accidental grabbing and wiring harness breakage.
Smart Images
Figure CN116113593B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a type of engineering machinery, and more particularly to engineering machinery in which a wiring harness is installed inside the door of the driver's cab. Background Technology
[0002] Patent document 1 discloses a door structure in which a wiring harness is routed from the inside of the door to the vehicle body via an insertion hole formed by a perforation in the side wall of the door. The wiring harness supplies power to electrical products mounted on the door of the vehicle.
[0003] In construction machinery, there is a need to improve the ease with which operators can enter and exit the cab. One example of this improvement is the installation of electrical products such as key switches that electronically lock the cab doors. Inside the doors, wiring harnesses are run from the main body of the cab. Power is supplied to these electrical products by connecting the wiring harnesses to them.
[0004] As another example of improved convenience, the following door structure is adopted: the door frame located in the cab of the construction machinery is hinged to the cab frame, allowing it to open 180° from the closed state (closed state) around the hinge. The door, now 180° open, can be held to the outside of the cab by opening the retaining locking mechanism. The operator can release the retaining locking mechanism by operating the open retaining lock release lever, thus closing the door.
[0005] In most cases, for ease of operation, the unlocking lever is located near the opening covered by the cab door. On the other hand, through-holes for the wiring harness are formed in the side walls of the hinges of both the door frame and the cab frame. The wiring harness is routed from the cab body side towards the interior of the door via these through-holes in both the cab and the door.
[0006] Existing technical documents
[0007] Patent documents
[0008] Patent Document 1: Japanese Patent Application Publication No. 2004-25974 Summary of the Invention
[0009] The problem that the invention aims to solve
[0010] When an operator outside the cab operates the release lever to open the retaining lock, the cab is positioned above the traveling body of the construction machinery, so the operator operates the release lever from below. Furthermore, when the door is open 180°, the wiring harness is exposed to the outside, passing between the insertion holes in the door and the insertion holes in the cab. Therefore, when the release lever is positioned lower than each insertion hole, the operator must avoid the exposed wiring harness, which may droop depending on the situation, while operating the release lever.
[0011] Therefore, in the existing technology, the operability and convenience of opening the retaining lock release lever are reduced, and the risk of the operator coming into contact with the wiring harness is increased. Specifically, there is a concern that an operator attempting to open the retaining lock release lever may accidentally grab the wiring harness and fall, or that the wiring harness may break.
[0012] The present invention was made in view of the following issues, and its object is to provide an engineering machine that can ensure operator convenience and reduce the danger of operator contact with wiring harnesses.
[0013] Solution for solving the problem
[0014] To achieve the above objectives, the engineering machinery of the present invention includes: a cab having a first frame forming an opening; a door having a second frame mounted to the first frame via a hinge and covering the opening in a closed state; an open-holding locking mechanism having a first engaging portion formed on the outer side of the cab and a second engaging portion formed on the outer side of the door, wherein when the door is opened, the second engaging portion engages with the first engaging portion to hold the door in an open state; and an open-holding locking release lever provided near the opening of the cab, wherein by releasing the engagement of the first engaging portion and the second engaging portion, the open-holding locking mechanism releases the door's open-holding lock. The first frame has a first through hole and a first space formed on a first side end wall on which a hinge is mounted, and the second frame has a second through hole and a second space formed on a second side end wall on which a hinge is mounted. A wiring harness is routed from the first space to the second space via the first through hole and the second through hole, and the first through hole and the second through hole are located above the open-holding locking release lever.
[0015] The effects of the invention
[0016] The engineering machinery according to the present invention can ensure operator convenience and reduce the risk of operator contact with wiring harnesses. Attached Figure Description
[0017] Figure 1 This is a side view of a hydraulic excavator, shown as an example of an engineering machine exemplified by an embodiment of the present invention.
[0018] Figure 2 This is a three-dimensional view of the driver's cab as seen from above.
[0019] Figure 3 It is a 3D view of the driver's cab with the door open.
[0020] Figure 4 This is a side view of the door and the first frame of the cab as seen from inside the cab when the door is closed.
[0021] Figure 5 It is a perspective view showing, in part, the first frame of the cab near the opening hold release lever when the door is open, and the second frame of the door.
[0022] Figure 6 This is a perspective view showing the wiring harness path laid out from the driver's cab to the interior of the door in a second space.
[0023] Figure 7 This is a side view showing the wiring harness path laid out from the driver's cab into the second space inside the door.
[0024] Figure 8 This is a side view showing the wiring harness path as seen from inside the driver's cab when the door is closed. Detailed Implementation
[0025] Hereinafter, the engineering machinery of various embodiments of the present invention will be described with reference to the accompanying drawings.
[0026] Figure 1 The image shows a side view of a hydraulic excavator 1, an example of construction machinery. The body 2 of the hydraulic excavator 1 consists of a self-propelled tracked lower traveling body 3 and a rotating upper traveling body 4 mounted rotatably on the lower traveling body 3. A swing-type working device 5 for excavating sand and soil is installed at the front of the upper rotating body 4. Furthermore, arrows indicate the forward and backward directions of the body 2 in each figure.
[0027] The upper slewing body 4 is configured to rotate within the width of the lower traveling body 3, and a cab 6 for the operator is located at the front of the upper slewing body 4. A counterweight 8 and a hydraulic pump (not shown) are supported on the slewing frame 7 of the upper slewing body 4. The working device 5 is mounted at the front of the slewing frame 7 and is configured to swing left and right by the rotation of the upper slewing body 4, and to pitch up and down.
[0028] The operating device 5, starting from the cab 6 side, includes a boom 9, a cantilever 10, and a bucket 11 in sequence. The boom 9 is mounted on the slewing frame 7, allowing it to pitch via a boom cylinder 12. The cantilever 10 is rotatably mounted on the boom 9 via a cantilever cylinder 13. The bucket 11 is rotatably mounted on the cantilever 10 via a bucket cylinder 14.
[0029] Figure 2 A perspective view of the cab 6 as seen from above is shown. Figure 3 A perspective view of the cab 6 with the door open is shown. The cab 6 has a first frame 15 on the side, and an opening 16 is formed in the first frame 15. The cab 6 is provided with a door 17 having a second frame 18. When closed, the door 17 covers the opening 16, and the second frame 18 of the door 17 is mounted to the first frame 15 of the cab 6 via hinges 19 disposed at the upper and lower parts.
[0030] like Figure 3 As shown, door 17 can be opened approximately 180° from the closed state, centered on each hinge 19. A handle 20 for opening and closing door 17 is provided on the lower front side of door 17. The handle 20 also functions as a door lock release lever to release the door 17 from the closed state. A key switch 21 is provided on the front side of handle 20 as an example of an electrical product. The key switch 21 can electronically lock and unlock door 17 when it is closed.
[0031] The driver's cab 6 is provided with an opening and holding locking mechanism 22 that keeps the door 17 in a substantially open 180° state. The opening and holding locking mechanism 22 has a first engaging portion 23 formed on the outer side of the driver's cab 6 in the first frame 15, and a second engaging portion 24 formed on the outer side of the door 17 in the second frame 18. By engaging the second engaging portion 24 with the first engaging portion 23 when the door 17 is opened 180°, the door 17 is kept in a substantially open 180° state.
[0032] Door 17 includes a maintenance window 25 located above the handle 20 and key switch 21, an upper window 26 located above the maintenance window 25, and a lower window 27 located below the upper window 26. The maintenance window 25 is a small, openable window located at the front of door 17, which, when opened, allows access to the second space 33 formed within the second frame 18 of door 17. The upper window 26 and lower window 27 are used to ensure the operator's visibility during the operation of the hydraulic excavator 1.
[0033] Figure 4 This shows a side view of the door 17 and the first frame 15 of the cab 6 as viewed from inside the cab 6 when the door 17 is closed. An open-holding lock release lever 28 is provided near the opening 16 of the first frame 15 of the cab 6 and above the floor 6a of the cab 6. By moving the open-holding lock release lever 28... Figure 4Rotating in the direction of the arc arrow indicates that the engagement between the first engaging part 23 and the second engaging part 24 is released, thereby releasing the opening retention locking mechanism 22 from retaining the door 17. An in-cabin door lock release lever 29 is provided at the location of the maintenance window 25 on the door 17. By operating the in-cabin door lock release lever 29, the door 17, which is in a closed state, can be released from the driver's cab 6.
[0034] Figure 5 The first frame 15 of the cab 6 and the second frame 18 of the door 17 are shown in partial perspective view near the open-hold lock release lever 28 when the door 17 is open. In the first frame 15 of the cab 6, a first through hole 30 is formed on the hinge 19 side, and a first space 31 extends from the first through hole 30 into the interior of the first frame 15. In the second frame 18 of the door 17, a second through hole 32 is formed on the hinge 19 side, and a second space 33 extends from the second through hole 32 into the interior of the second frame 18.
[0035] Specifically, a first through hole 30 is formed in the first frame 15 of the cab 6, on the first side wall 15a where a hinge 19 is mounted. A second through hole 32 is formed in the second frame 18 of the door 17, on the second side wall 18a where a hinge 19 is mounted. When the door 17 is closed, the first side wall 15a and the second side wall 18a are opposite each other. Correspondingly, the first through hole 30 and the second through hole 32 are opposite each other. The first through hole 30 and the second through hole 32 are located above the open holding lock release lever 28.
[0036] Figure 6 This is a perspective view showing the wiring harness path laid out from inside the cab 6 into the second space 33 inside the door 17. Figure 7 This is a side view showing the wiring harness path laid out from inside the cab 6 into the second space 33 inside the door 17. Figure 6 and Figure 7 The door 17 is shown in the open position. A wiring harness 34 is routed from a power supply source (not shown) located in the driver's cab 6 toward the door 17, and the wiring harness 34 supplies power to the key switch 21.
[0037] The wiring harness 34 is laid near the floor 6a in the cab 6, then in the first space 31 of the cab 6, temporarily exposed from the first space 31 by being inserted through the first insertion hole 30, and then through the second insertion hole 32 to the second space 33 of the door 17. That is, the wiring harness 34 is laid from the first space 31 of the cab 6 to the second space 33 of the door 17 via the first insertion hole 30 and the second insertion hole 32, which are located higher than the unlocking and retaining locking release lever 28.
[0038] When the operator operates the release lever 28 with the door 17 approximately 180° open, the operator can operate the release lever 28 from outside the cab 6 while standing on the ground, or while seated in the cab 6. In this case, by positioning the first through hole 30 and the second through hole 32 higher than the release lever 28, the risk of the operator coming into contact with the wiring harness 34 exposed to the outside between the first through hole 30 and the second through hole 32 is reduced.
[0039] A first wiring space 35 is formed in the second space 33 of door 17 and near the maintenance window 25. After the wire harness 34 is inserted through the second through hole 32 of door 17, it passes through the first wiring space 35, bends downward, and connects to the key switch 21. After the wire harness 34 is inserted through the second through hole 32 of door 17, it passes through the first wiring space 35 near the maintenance window 25, bends downward, and connects to the key switch 21. When the wire harness 34 is laid in the second space 33, the first wiring space 35 is accessed by opening the maintenance window 25, thereby making it easy to bend the wire harness 34 downward toward the key switch 21.
[0040] A second wiring space 36 is formed in the second space 33 of the door 17 and between the upper window 26 and the lower window 27. After the wire harness 34 is inserted through the second insertion hole 32 of the door 17, it passes through the second wiring space 36 and the first wiring space 35, bends downward, and connects to the key switch 21.
[0041] Figure 8 This is a side view showing the wiring harness path as seen from inside the driver's cab 6 when the door 17 is closed. The second wiring space 36 formed in the second space 33 of the door 17 also functions as an excess length storage section 37, which stores the excess length of the wiring harness 34 generated when the door 17 is switched from the open state to the closed state. When the door 17 is closed, the excess length 34a of the wiring harness 34 is stored in the second wiring space 36, which serves as the excess length storage section 37, in a bent manner, so that the excess length of the wiring harness 34 does not extend into the driver's cab 6.
[0042] As described above, in the hydraulic excavator 1 of this embodiment, the first insertion hole 30 and the second insertion hole 32 through which the wiring harness 34 is inserted are located higher than the opening and retaining locking release lever 28. This ensures the operability of the opening and retaining locking release lever 28 and the convenience of the operator, and reduces the risk of the operator coming into contact with the wiring harness 34 exposed to the outside between the first insertion hole 30 and the second insertion hole 32. Specifically, it reduces the concern that the operator attempting to operate the opening and retaining locking release lever 28 might accidentally grab the wiring harness 34 and fall, or that the wiring harness 34 might break.
[0043] Furthermore, since a first wiring space 35 is formed in the second space 33 of the door 17, when the wiring harness 34 is laid in the second space 33, it is easy to perform the operation of bending the wiring harness 34 toward the key switch 21 if the maintenance window 25 is opened.
[0044] Furthermore, by forming a second wiring space 36 in the second space 33 of the door 17, the second wiring space 36 formed between the upper window 26 and the lower window 27 in the second space 33 can be used as a wiring harness path. Therefore, the limited space of the second space 33 can be effectively utilized.
[0045] Furthermore, the second wiring space 36 formed in the second space 33 of the door 17 also functions as an excess length storage part 37 for storing excess length of the wiring harness 34. Thus, when the door 17 is closed, there will be no situation where excess length of the wiring harness 34 extends into the cab 6, thereby reducing the visibility and comfort of the cab 6.
[0046] This concludes the description of one embodiment of the present invention. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0047] For example, regarding the wiring path formed in the second space 33 of the door 17, if a first wiring space 35 and a second wiring space 36 are formed, it is not limited to the arrangement shown in the figure. Furthermore, the structure in the above embodiments that does not depart from the spirit of the invention is not limited to the hydraulic excavator 1, but can also be applied to various construction machinery equipped with working devices other than the working device 5.
[0048] Explanation of symbols
[0049] 1—Hydraulic excavator (construction machinery), 6—Cab, 15—First frame, 15a—First side wall, 16—Opening, 17—Door, 18—Second frame, 18a—Second side wall, 19—Hinge, 21—Key switch (electrical product), 22—Opening and retaining locking mechanism, 23—First engaging part, 24—Second engaging part, 25—Maintenance window, 26—Upper side window, 27—Lower side window, 28—Opening and retaining locking release lever, 30—First insertion hole, 31—First space, 32—Second insertion hole, 33—Second space, 35—First wiring space, 36—Second wiring space, 37—Excess length storage part.
Claims
1. An engineering machinery, characterized in that, have: The driver's cab has a first frame forming an opening; A door having a second frame mounted to the first frame via hinges, and covering the opening when closed; The locking mechanism has a first engaging portion formed on the outer side of the driver's cab and a second engaging portion formed on the outer side of the door. When the door is opened, the second engaging portion engages with the first engaging portion to keep the door open. The locking release lever, located near the opening in the driver's cab, releases the door opening retention mechanism by disengaging the first and second engaging parts. The aforementioned first frame has a first through hole and a first space formed in the first side end wall on which the aforementioned hinge is mounted. The second frame has a second through hole and a second space formed in the second side end wall on which the hinge is mounted. The wiring harness is laid from the first space to the second space through the first insertion hole and the second insertion hole. By moving the aforementioned open-holding lock release lever downwards, the engagement between the first engaging part and the second engaging part is released, thereby releasing the open-holding lock mechanism from holding the door open. The first insertion hole and the second insertion hole are located on the upper side of the opening, holding, locking release lever.
2. The engineering machinery according to claim 1, characterized in that, The aforementioned door includes electrical components and a maintenance window located above the electrical components. A first wiring space is formed in the second space of the aforementioned door and near the aforementioned maintenance window. After the aforementioned wiring harness is inserted through the second through hole of the aforementioned door, it passes through the first wiring space near the aforementioned maintenance window and connects to the aforementioned electrical product.
3. The engineering machinery according to claim 2, characterized in that, The aforementioned door has an upper side window located above the aforementioned maintenance window and a lower side window located below the aforementioned upper side window. A second wiring space is formed in the second space of the aforementioned door and between the aforementioned upper window and the aforementioned lower window. After the wiring harness is inserted through the second through hole of the door, it is connected to the electrical product through the second wiring space and the first wiring space.
4. The engineering machinery according to claim 3, characterized in that, The second wiring space formed in the second space of the door is an excess length storage part, which stores the excess length of the wire harness generated when the door is switched from the open state to the closed state.