JP5132924B2 - Rear surveillance camera mounting structure - Google Patents

Description

  The present invention relates to a mounting structure for a rear monitoring camera that is mounted in order to ensure safety behind a construction machine such as a hydraulic excavator.

2. Description of the Related Art In recent years, in order to make it possible to visually recognize safety in the back of a construction machine such as a hydraulic excavator, a rear monitor camera mounted on the upper surface of a member installed behind a counterweight or the like has been used. .
In a construction machine equipped with such a rear monitoring camera, an operator operating in the cab can perform operations such as turning while checking the rear image of the construction machine displayed by the camera. Safety can be improved.

For example, Patent Document 1 discloses a structure in which a surveillance camera is attached using a suspension hole formed on the upper surface of a counterweight used when the counterweight is assembled. According to such a configuration, it is possible to fix the monitoring camera on the counterweight without providing a storage room for the monitoring camera on the counterweight and without using welding.
JP2003-221844 (released on August 8, 2003) JP 2006-161306 A (published June 22, 2006)

However, the conventional surveillance camera installation structure has the following problems.
That is, in the monitoring camera mounting structure disclosed in the above publication, the bolts are mounted using the suspension holes formed on the counterweight, but the cable connected to the monitoring camera is on the counterweight. It is in an exposed state. For this reason, in a work site etc., there exists a possibility that a flying object may hit a cable and a cable may be damaged, for example.

In order to solve such a problem, Patent Document 2 discloses a configuration in which a cable is not exposed to the outside by installing a protective cover on the cable and passing the cable through the groove.
However, such a configuration requires a separate protective cover for concealing the cable, which causes a problem of an increase in the number of parts.
An object of the present invention is to provide a rear surveillance camera mounting structure capable of protecting a rear surveillance camera cable without increasing the number of parts and effectively preventing the rear surveillance camera from being stolen.

The mounting structure for the rear monitoring camera according to the first invention includes a rear monitoring camera, a through hole, a support case, and a cover member. The rear monitoring camera is installed on a counterweight mounted on the rear part of the construction machine. The through hole is formed on the upper surface of the counterweight. The support case supports the rear monitoring camera and has a concave opening that allows a cable connected to the rear monitoring camera to pass through. The support case is connected to the upper surface of the counterweight so that the opening and the through hole communicate with each other. It is attached using fixing bolts. The cover member is attached to a position that covers the fastening portion of the fixing bolt with respect to the support case.

Here, the opening portion for passing the cable in the support case that supports the rear monitoring camera is attached so as to be aligned with the through hole formed in the upper surface of the counterweight. Then, the cover member is attached to the bracket that is attached and fixed to the counterweight together with the support case.
Here, the support case that supports the rear monitoring camera includes, for example, a box-shaped case that has an opening for passing a cable on the bottom surface and covers the entire rear monitoring camera. The through hole formed on the counterweight penetrates to the clearance between the inner surface of the counterweight upper surface cover and the upper surface of a heavy object such as concrete filled in the counterweight. Moreover, as a cover member, what is attached so that the whole upper surface of a support case may be covered, and what is attached so that only the part of the fastening part of a fixing bolt may be covered are included.

  Thereby, the cable connected to the rear surveillance camera attached to the support case can be directly passed from the support case to the through hole on the upper surface of the counterweight. As a result, even if a cover for hiding the cable portion is not provided separately, the cable extending from the rear monitoring camera is not exposed to the outside such as on the counterweight, so it can be easily mounted on the counterweight while reducing the number of parts. Therefore, it is possible to obtain a mounting structure for the rear monitoring camera. Furthermore, in order to remove the rear monitoring camera, it is necessary to access the fastening portion of the fixing bolt that fixes the support case after removing the cover member, so that the fixing bolt is exposed to the outside. In comparison, theft of the rear monitoring camera mounted on the counterweight can be suppressed.

  Further, here, the opening formed in the bottom surface of the support case that supports the rear monitoring camera is formed in a concave shape.
  Thereby, as compared with a simple circular opening or the like, in the case of a concave opening, it is possible to secure more space for moving the cable passed through the opening. As a result, since the direction of the cable can be changed flexibly, insertion into the through hole formed in the upper surface of the counterweight can also be performed relatively easily.

The rear surveillance camera mounting structure according to the second invention is the rear surveillance camera mounting structure according to the first invention, wherein the cover member elastically deforms a part thereof or a part of the attachment destination member. It is attached by.
Here, as a method of fixing the cover member, for example, a part of the cover member is elastically deformed by inserting an elastically deformable claw member or the like into the attachment destination.

This makes it impossible to see any fastening bolt fastening part when viewed from the outside. Compared to the structure in which the fastening bolt fastening part is exposed to the outside, the rear surveillance camera body, support case, cover member, etc. It becomes difficult to remove. As a result, it is possible to suppress theft of the rear monitoring camera.
A rear surveillance camera mounting structure according to a third aspect of the present invention is the rear surveillance camera mounting structure according to the first or second aspect of the present invention, wherein one end thereof communicates with a through hole formed in the counterweight. The other end portion further includes a pipe material communicating with the main body of the construction vehicle to which the counterweight is attached.

Here, the through hole formed in the upper surface of the counterweight and the main body side of the construction machine on which the counterweight is mounted are communicated with each other through a pipe material.
Thereby, the cable passed through the through hole formed in the upper surface of the counterweight can be easily guided to the main body side of the construction machine through the inner cylinder side of the pipe material. Furthermore, by attaching this pipe material to the ceiling surface of the upper surface cover of the counterweight, it is possible to fill concrete or the like that becomes the weight of the counterweight to the vicinity of the upper surface.

A rear surveillance camera mounting structure according to a fourth aspect of the present invention is the rear surveillance camera mounting structure according to the third aspect of the present invention, wherein an opening portion on one end side of the pipe member is closed.
Here, the opening part of the one end part of the pipe material for letting the cable connected to a back surveillance camera pass is block | closed.
Thereby, it is possible to prevent outside air, water, dust, and the like from entering the counterweight from the opening formed in the upper surface of the counterweight. As a result, the occurrence of rust or the like in the counterweight can be prevented .

The rear surveillance camera mounting structure according to a fifth aspect of the present invention is the rear surveillance camera mounting structure according to any one of the first to fourth aspects of the present invention, wherein the support case includes an angle of the rear surveillance camera. An alignment unit serving as an adjustment index is provided.
Here, when the rear monitoring camera is mounted on the counterweight, the camera mounting angle is adjusted to an appropriate angle using the alignment unit according to the model of the mounted construction machine.

As the alignment unit, for example, an alignment mark or the like is printed, and a seal-like member attached on an extension line of a specific part of the camera in the support case is conceivable.
Thereby, for example, even when a rear monitoring camera is installed later, the camera can be mounted at an appropriate angle for each model to be mounted by using the alignment unit.

  According to the mounting structure of the rear monitoring camera according to the present invention, the cable of the rear monitoring camera can be protected without increasing the number of parts.

A hydraulic excavator (construction machine) 1 that employs a mounting structure 20 for a rear monitoring camera 22 according to an embodiment of the present invention will be described below with reference to FIGS.
[Configuration of hydraulic excavator 1 as a whole]
As shown in FIG. 1, the hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, a swivel base 3, a work implement 4, a counterweight 5, an engine 6, an equipment room 9, and a cab 10. And a mounting structure 20 for the rear monitoring camera 22.

The lower traveling body 2 has the crawler belt P wound around the left and right ends of the traveling direction rotated to move the excavator 1 forward and backward, and the swivel base 3 is mounted on the upper surface side in a swingable state. .
The swivel base 3 can be swung in any direction on the lower traveling body 2, and has a work machine 4, a counterweight 5, an engine 6, and a cab 10 mounted on the upper surface.

  The work machine 4 is configured to include a boom 11, an arm 12 attached to the tip of the boom 11, and a bucket 13 attached to the tip of the arm 12. The work machine 4 moves the boom 11, the arm 12, the bucket 13 and the like up and down by the hydraulic cylinders 11a, 12a and 13a included in a hydraulic circuit (not shown), and the earth and sand and gravel on the site of the civil engineering work. Excavation work.

The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and hardened. The counterweight 5 is provided on the turntable 3 to balance the vehicle body during mining work or the like. ing. Further, a through hole 5 a for attaching a rear monitoring camera 22 to be described later is formed near the center of the rear end portion on the upper surface of the counterweight 5.
The engine 6 is a drive source for driving the lower traveling body 2 and the work implement 4, and is disposed in a space adjacent to the counterweight 5 on the swivel base 3.

The equipment room 9 is disposed behind the work machine 4 and houses a fuel tank, a hydraulic oil tank, an operation valve, and the like (not shown).
The cab 10 is a driver's cab in which an operator of the excavator 1 gets on and off, and is disposed on the left front side on the swivel 3 so that the tip of the work machine 4 can be seen. .

  The mounting structure 20 for the rear monitoring camera 22 is provided in the vicinity of the rear end portion on the upper surface of the counterweight 5 and is provided for taking a picture behind the counterweight 5 displayed on the monitor screen in the cab 10. The rear surveillance camera 22 is attached and fixed. Thereby, it is possible to perform work while confirming the safety behind the excavator 1 on a monitor or the like installed in the cab 10. The mounting structure 20 for the rear monitoring camera 22 will be described in detail later.

[Mounting structure 20 for rear monitoring camera 22]
The rear surveillance camera 22 mounting structure 20 of the present embodiment is provided in the vicinity of the center of the rear end on the counterweight 5 as shown in FIG. 2, and as shown in FIG. 3, FIG. 4, and FIG. A through hole 5 a formed on the upper surface of the counterweight 5, a casing (support case) 21, a rear monitoring camera 22, a cable 23, and a bracket member 25 are included.

The through hole 5a is formed at a position near the center of the rear end in the plate material forming the ceiling surface of the counterweight 5. The through hole 5a is covered with a casing 21 that houses the rear monitoring camera 22 mounted on the counterweight 5, and is not exposed to the outside.
The casing 21 houses the rear monitoring camera 22 therein, and is constituted by three members, a lower casing 31, an upper casing 32, and a cover member 33, as shown in FIG. The casing 21 is formed with a recess (opening) 31b as a cable hole in a part of its bottom portion (lower casing 31). For this reason, the cable 23 connected to the rear monitoring camera 22 through the recess 31 b is sent into the counterweight 5.

  The rear monitoring camera 22 is a photographing device for photographing a rear image of the counterweight 5 displayed on a monitor or the like disposed in the cab 10 in order to confirm the rear safety during work or the like. It is attached to the rear end of the counterweight 5 via the structure 20. In addition, a cable 23 for sending a video signal or the like to a monitor or the like in the cab 10 is connected to the rear end portion of the rear monitoring camera 22. Note that the rear monitoring camera 22 of the present embodiment has its mounting angle adjusted by an angle adjusting mechanism 43 described later, and the angle adjusting mechanism 43 will be described in detail later.

The cable 23 connects the rear monitoring camera 22 and its monitor in order to send out a video signal photographed by the rear monitoring camera 22 to a monitor or the like installed in the cab 10. Further, as shown in FIG. 6 and the like, the cable 23 passes through the inside of the pipe member 30 having a substantially rectangular cross section and is connected to the cab 10 side inside the counterweight 5.
As shown in FIG. 5, the bracket member 25 is provided in the casing 21 for fixing the rear monitoring camera 22 in the casing 21 and fixing the upper casing 32 to the lower casing 31. And the bracket member 25 is comprised by three members, the 1st bracket 25a, the 2nd bracket 25b, and the 3rd bracket 25c, as shown in FIG.5, FIG.8 (a) and FIG.8 (b). The configuration of each member constituting the bracket member 25 will be described in detail later.

(Casing 21)
As described above, the casing 21 includes the lower casing 31, the upper casing 32, and the cover member 33 (see FIG. 5).
As shown in FIG. 5, the lower casing 31 is a member that is directly fixed to the upper surface of the counterweight 5 and supports the rear monitoring camera 22 from below. Further, as shown in FIGS. 7A and 7B, the lower casing 31 has bolt holes 31a, 31a, a recess (opening) 31b, and a peep hole 31c. The bolt holes 31a and 31a are arranged so as to overlap the bosses 55 and 56 formed on both sides of the through hole 5a formed on the upper surface of the counterweight 5, and the inserted bolts are the bosses 55 and 56 (see FIG. 4). ) And the first bracket 25a (see FIGS. 8A and 8B) and is fixed to the upper surface of the counterweight 5. The recess 31b is a cutout portion for allowing the cable 23 connected to the rear monitoring camera 22 to pass therethrough, and opens toward the opposite side of the lower casing 31 from the shooting direction by the rear monitoring camera 22. Accordingly, even when the cable 23 is inserted into the pipe member 30 before or after the lower casing 31 is fixed, the passage of the cable 23 is not obstructed by the lower casing 31, so that the cable can be smoothly connected. 23 can be inserted into the pipe member 30. The peephole 31c is an opening formed to expose the lens portion of the rear monitoring camera 22 attached to the lower casing 31, and is attached to the upper surface of the counterweight 5. As shown in FIG. 7 (b), the aperture is opened obliquely downward so that an obliquely downward image can be taken.

  As shown in FIG. 5, the upper casing 32 is fixed to the lower casing 31 via a bracket member 25 described later so as to cover the upper surface of the rear monitoring camera 22 attached to the lower casing 31. Further, as shown in FIG. 5, the upper casing 32 has bent portions of nut portions 25e and 25f formed on the upper portions of the first and second brackets 25a and 25b (see FIGS. 8A and 8B). ) Are fixed by bolts 51 and 52 inserted into bolt holes 32b and 32b shown in FIGS. 9 (a) and 9 (b). Further, as shown in FIGS. 9A and 9B, the upper casing 32 has a cover attachment portion 32a on the upper surface portion. The cover attachment portion 32a is a flat portion formed on a part of the upper surface of the upper casing 32, and a cover member 33 described later is fitted by fitting. The cover mounting portion 32a has bolt holes 32b and 32b into which the fixing bolts 51 and 52 are inserted, and locking grooves 32c and 32d into which the claw members 33a and 33b of the cover member 33 are inserted and locked, respectively. Is formed.

  As shown in FIGS. 10A to 10C, the cover member 33 has claw members 33 a and 33 b that are connected to the cover attachment portion 32 a with respect to the cover attachment portion 32 a formed on the upper surface of the upper casing 32. It is a resin member that is fixed by being locked in the stop grooves 32d and 32c (see FIG. 9A). The claw members 33a and 33b are inserted and locked in the locking grooves 32d and 32c of the cover mounting portion 32a, respectively, while being elastically deformed. Thus, the rear surveillance camera 22 can be prevented from meeting theft by locking the cover member 33 that hides the bolt fastening portion of the upper casing 32 without using the bolt.

(Bracket member 25)
As described above, the bracket member 25 includes the first bracket 25a, the second bracket 25b, and the third bracket 25c (see FIG. 5).
As shown in FIGS. 5, 8 (a) and 8 (b), the first bracket 25 a is a bolt of the lower casing 31 at the end of the lower casing 31 opposite to the shooting direction by the rear monitoring camera 22. The bolts inserted into the holes 31a and 31a and the bolt holes 25d and 25d are fixed to the bosses 55 and 56 attached to the lower part of the counterweight 5 together with the lower casing 31 together with the lower casing 31. And the nut part 25e is provided in the bending part formed in this 1st bracket 25a upper part. The nut portion 25 e is screwed with a bolt 51 inserted into a bolt hole 32 b formed in the upper casing 32.

  As shown in FIGS. 5, 8 (a) and 8 (b), the second bracket 25b is disposed in the vicinity of the center of the lower casing 31, and the lower casing 31 is formed by bolts inserted into the bolt holes 25g. At the same time, it is fixed to a bolt hole formed on the upper surface of the counterweight 5. Moreover, the nut part 25f is provided in the bending part formed in the 2nd bracket 25b upper part. The nut portion 25 f is screwed with a bolt 52 inserted into a bolt hole 32 b formed in the upper casing 32.

  As shown in FIG. 5, the third bracket 25 c is fixed to the second bracket 25 b via a connecting portion 54, and the rear end portion of the counterweight 5 in the casing 21 for attaching the rear monitoring camera 22. It is arranged closer. Further, as shown in FIG. 13, a positioning bracket 42 that constitutes an angle adjusting mechanism 43 that adjusts the angle of the rear monitoring camera 22 is attached to the third bracket 25 c. The configuration of the angle adjustment mechanism 43 will be described in detail later.

(Pipe material 30)
As shown in FIG. 6, the pipe member 30 is formed on the ceiling surface in the space inside the counterweight 5 in order to guide the cable 23 connected to the rear monitoring camera 22 described above from the counterweight 5 toward the cab 10 side. It is attached. And the pipe material 30 has the main body 30a, the upper surface opening 30b, and the edge part opening 30c, as shown to Fig.11 (a)-FIG.11 (c).

The main body 30a is a steel pipe having a substantially rectangular cross section, and is provided in the internal space of the counterweight 5 so as to pass the cable 23 of the rear monitoring camera 22 therein.
As shown in FIG. 5, the upper surface opening 30b communicates with a through hole 5a formed on the upper surface of the counterweight 5, and the cable 23 passes into the main body 30a through the upper surface opening 30b and the through hole 5a. Led. Thus, the end of the pipe member 30 on the side of the upper surface opening 30b has no end opening and is a closed end. Thereby, it is possible to avoid that moist air or the like enters the internal space of the counterweight 5 through the upper surface opening 30b and rust or the like is generated inside the counterweight 5.

  The end opening 30c is an opening formed at the end of the pipe member 30 opposite to the mounting side of the rear monitoring camera 22 (cab 10 side), and is substantially the same as the cross section of the main body 30a. Yes. Further, as shown in FIG. 6, a buffer member 41 is attached to the end opening 30c. As shown in FIG. 12, the buffer member 41 has a first sponge part 41a in which a tear is formed, a cable hole 41b formed below the first sponge part 41a, and a second sponge part 41c. ing. Thus, by attaching such a buffer member 41 to the end portion on the cab 10 side, hot air or the like from the engine 6 enters the pipe material 30 and communicates with the end portion on the opposite side. It is possible to prevent heat from being applied to the installation space.

  In addition, in the manufacturing process of the counterweight 5, the pipe material 30 is fixed to the ceiling surface that constitutes the outline of the counterweight 5 at a stage before a heavy object such as concrete is put therein. Thereby, for example, even when concrete is poured into the interior as a heavy object, the space through which the cable 23 is passed is secured by the pipe material 30, so that the container constituting the outer portion of the counterweight 5 can be filled to almost full. .

(Angle adjustment mechanism 43)
As shown in FIG. 13, the angle adjustment mechanism 43 is formed using a rear monitoring camera 22 and a positioning bracket 42 to which the rear monitoring camera 22 is attached.
Specifically, the rear monitoring camera 22 is attached in a slidable state on the curved surface portion of the positioning bracket 42, thereby changing the direction of the rear monitoring camera 22.

The positioning bracket 42 is fixed to the third bracket 25c using a connecting portion 54. As shown in FIGS. 14 (a) to 14 (c), the long holes 42a and 42a, the positioning seal 42b, And bolt holes 42c, 42c.
As shown in FIG. 14A, the long holes 42a and 42a are openings formed in the curved surface portion of the positioning bracket 42 along the sliding direction of the rear monitoring camera 22, and are shown in FIGS. As shown, the mounting direction of the rear monitoring camera 22 with respect to the positioning bracket 42 is determined by the two positioning bolts 53, 53 inserted into the opening.

  The positioning seal 42b is affixed above the curved surface portion of the positioning bracket 42 as shown in FIGS. 14 (a) and 14 (b). A plurality of positioning lines are printed on the positioning seal 42b in a direction orthogonal to the sliding direction of the rear monitoring camera 22 (longitudinal direction of the long holes 42a and 42a). Accordingly, when the two positioning bolts 53 and 53 are loosened and the direction of the rear monitoring camera 22 is changed, for example, the center position of the positioning bolts 53 and 53 is aligned with a predetermined positioning line of the positioning seal 42b. Thus, the rear monitoring camera 22 can be easily attached so as to have a desired attachment angle.

Bolts 57 and 57 for fixing the positioning bracket 42 to the third bracket 25c are inserted into the bolt holes 42c and 42c.
<Installation method of the rear monitoring camera 22>
The rear monitoring camera 22 of the present embodiment employs the mounting structure 20 as described above, and is mounted near the rear center portion of the counterweight 5 by the following procedure.

That is, first, the pipe material 30 is attached to the ceiling surface of the internal space of the counterweight 5 by welding, and the interior is filled with a filler such as concrete. The pipe member 30 is attached so that the through hole 5a formed on the upper surface of the counterweight 5 and the upper surface opening 30b of the pipe member 30 communicate with each other.
Then, bosses 55 and 56 for fixing the lower casing 31 and the like are attached to both sides of the through hole 5 a of the counterweight 5.

  Next, with the bracket member 25 and the rear monitoring camera 22 attached to the lower casing 31, the cable 23 previously connected to the rear monitoring camera 22 is passed through the recess 31 b of the lower casing 31 and the counterweight 5. It inserts into the inside of the pipe material 30 through the hole 5a. When all the cables 23 are inserted into the pipe member 30, the end of the cable 23 is pulled out from the end opening 30c on the cab 10 side.

  Next, the bolt holes 25d and 25d formed in the first bracket 25a and the bolts inserted into the bolt holes 31a and 31a formed in the lower casing 31 are attached to the bosses 55 and 56 fixed on the counterweight 5 side. Screwed together. Accordingly, the lower casing 31 is installed at a predetermined position on the upper surface of the counterweight 5 together with the bracket member 25, the rear monitoring camera 22, and the like.

Next, when the lower casing 31 or the like is installed on the upper surface of the counterweight 5, the attachment angle of the rear monitoring camera 22 is adjusted using the angle adjustment mechanism 43. Thereby, according to the model with which the rear monitoring camera 22 was attached, the rear monitoring camera 22 can be attached so that it may become an appropriate angle suitably.
Next, the upper casing 32 is attached to the lower casing 31. Specifically, the bolts inserted into the bolt holes 32b formed on the upper surface of the upper casing 32 are screwed into the nut portions 25e and 25f attached to the upper portions of the first and second brackets 25a and 25b. The upper casing 32 can be fixed on the lower casing 31.

  Finally, the cover member 33 is attached to the cover attachment portion 32a on the upper surface of the upper casing 32 in order to hide the fastening portion of the bolt for fixing the upper casing 32 exposed on the upper surface of the upper casing 32. The cover member 33 is attached to the upper casing 32 using elastic deformation in the claw members 33a and 33b without using bolts or the like.

[Features of the mounting structure 20 of the rear monitoring camera 22]
(1)
As shown in FIG. 5, the mounting structure 20 for the rear monitoring camera 22 of the present embodiment communicates with the rear monitoring camera 22, the through hole 5a formed on the upper surface of the counterweight 5, and the through hole 5a. In order to support the rear monitoring camera 22, the casing 21 (lower casing 31) installed on the counterweight 5 is provided. Further, in the mounting structure 20 of the rear monitoring camera 22, the cover member 33 is attached to the upper surface of the upper casing 32 in order to hide the fastening portion of the bolt for fixing the upper casing 32.

  As a result, the cable 23 connected to the rear monitoring camera 22 can be guided directly into the counterweight 5 through the recess 21 b of the casing 21 and the through hole 5 a of the counterweight 5. As a result, it is possible to prevent the cable 23 from being exposed to the outside and prevent the cable 23 from being damaged. Further, since it is not necessary to provide a separate protective member for preventing damage to the cable 23, the configuration can be simplified and the cost can be reduced as compared with the mounting structure of the rear monitoring camera having the conventional cable protection structure.

  Further, in order to remove the rear monitoring camera 22 from the counterweight 5, first, after removing the cover member 33 using a specific removal tool or the like, the bolt fastening part for fixing the upper casing 32 is loosened and the upper part is removed. It is necessary to remove the casing 32 and loosen the bolts that fix the lower casing 31. Therefore, since the fastening portion of the bolt is not exposed to the outside, it is difficult for a person who first sees the mounting structure 20 to know where it should be removed, so that the rear surveillance camera 22 can be effectively prevented from being stolen. . Moreover, since the three casings 31, 32, and 33 must be removed in order to remove the rear monitoring camera 22, it is also effective in preventing theft from the point that it takes much time.

(2)
In the mounting structure 20 for the rear monitoring camera 22 of the present embodiment, as shown in FIGS. 9A and 10B, when the cover member 33 is attached, a part of the cover member 33 (the claw members 33a, 33b) is fixed to the upper surface of the upper casing 32 by elastically deforming.
Thereby, since the bolt fastening part in the upper casing 32 can be hidden without using a bolt, for those who have not handled the mounting structure 20, the upper casing 32 fixing the rear monitoring camera 22 and It becomes difficult to remove the lower casing 31. As a result, the rear surveillance camera 22 is effectively prevented from being stolen.

(3)
In the mounting structure 20 for the rear monitoring camera 22 of this embodiment, one end communicates with the through hole 5a of the counterweight 5 as shown in FIGS. 5, 6, and 11 (a) to 11 (c). The pipe member 30 having the other end communicating with the cab 10 is installed in the internal space of the counterweight 5.

Thereby, the cable 23 inserted into the counterweight 5 can be protected by the pipe material 30. In addition, by attaching the pipe material 30 to the uppermost part in the internal space of the counterweight 5, it is possible to fill the counterweight 5 with a filler such as concrete up to the uppermost part while ensuring a space for the cable 23 to pass through. it can.
(4)
In the mounting structure 20 of the rear monitoring camera 22 of the present embodiment, as shown in FIG. 5, the end of the pipe member 30 on the mounting side of the rear monitoring camera 22 is in a through hole 5 a formed on the upper surface of the counterweight 5. Except for the upper surface opening 30b which communicates, it is closed.

As a result, it is possible to prevent problems such as the occurrence of rust inside the counterweight 5 due to rainwater, damp air, or the like mixed from the mounting portion of the rear monitoring camera 22 through the through hole 5a.
(5)
In the mounting structure 20 for the rear monitoring camera 22 of the present embodiment, as shown in FIG. 7A, the lower casing 31 has a recess 31 b as an opening for passing the cable 23 connected to the rear monitoring camera 22. Is formed.

Accordingly, when the cable 23 is passed through the pipe member 30 through the through hole 5a, the cable 23 can be moved to the open side of the recess 31b and the direction thereof can be changed relatively freely. The workability when the camera 22 is attached can be improved.
(6)
In the mounting structure 20 for the rear monitoring camera 22 of the present embodiment, as shown in FIG. 13, an angle adjustment mechanism 43 for adjusting the mounting angle of the rear monitoring camera 22 is provided.

As a result, even when the model of the hydraulic excavator 1 installed on the counterweight 5 is changed, the mounting angle of the rear monitoring camera 22 is adjusted for each model, so that it can always be mounted appropriately regardless of the model. A desired range can be photographed at an angle.
[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the embodiment described above, an example in which the mounting structure 20 for the rear monitoring camera 22 is installed in a state where the through hole 5a, the fixing bolt hole, and the like are already formed on the upper surface of the counterweight 5 has been described. However, the present invention is not limited to this.
For example, a rear monitoring camera can be installed later on a construction machine such as a hydraulic excavator not equipped with a rear monitoring camera.

In this case, a through hole for passing the cable and a bolt hole for fixing are formed in the iron plate on the upper surface of the counterweight, and the rear monitoring camera 22 is installed by the mounting structure 20 as in the above embodiment. It is possible to obtain the same effect as described above, which can prevent damage to the film.
(B)
In the above-described embodiment, the casing 21 including the lower casing 31, the upper casing 32, the cover member 33, and the like has been described as an example as a case for supporting the rear monitoring camera 22. However, the present invention is not limited to this.

For example, the rear surveillance camera may be attached using a support case configured to have a cover member directly attached to the lower casing without the upper casing.
In this case, it is possible to reduce the labor when removing the rear monitoring camera, but it is easy for the thief who aims at the rear monitoring camera to remove, so in the sense of enhancing the anti-theft effect as in the above embodiment. It is more preferable to use a simple configuration.

(C)
In the above embodiment, the cover member 33 attached to the upper casing 32 has been described with an example in which the cover member 33 is fixed to the upper casing 32 using the elastic deformation of the claw members 33a and 33b. However, the present invention is not limited to this.
For example, instead of elastic deformation of the claw member, the cover member may be fixed using screws or the like fastened using a special tool.

However, in the point that the bolt fastening portion of the upper casing can be hidden without using a special tool or the like, it is more preferable to use elastic deformation of the claw member or the like as in the above embodiment.
(D)
In the above-described embodiment, an example in which the positioning seal 42b serving as a reference for the mounting angle of the rear monitoring camera 22 is attached to the positioning bracket 42 included in the angle adjusting mechanism 43 has been described. However, the present invention is not limited to this.

For example, the mounting angle of the rear monitoring camera may be adjusted based on the positioning line formed on the positioning bracket, not the positioning seal.
(E)
In the said embodiment, the example which employ | adopted the fixing method using a volt | bolt etc. was given and demonstrated as the shape of each part 31-33 which comprises the casing 21, and the bracket member 25 grade | etc., And a fixing method. However, the present invention is not limited to this.

For example, you may make it fix an upper casing and a lower casing using elastic deformation, such as a nail | claw member, respectively.
In addition, the shape and fixing method of the casing 21 and the bracket member 25 are not limited to the shape of the above embodiment and the fixing with bolts, and can be appropriately changed.
(F)
In the above embodiment, an example in which only one rear monitoring camera 22 is arranged near the rear end portion of the upper surface of the counterweight 5 arranged behind the swivel base 3 has been described. However, the present invention is not limited to this.

For example, one monitoring camera may be arranged at a position where the turning range of the revolving structure can be reflected, for example, the left rear direction and the right rear direction on the left and right side surfaces of the upper revolving structure, respectively. Moreover, you may arrange | position to the side part and lower part of a counterweight.
Even in this case, it is possible to attach the rear surveillance camera without exposing the cable to the outside by passing the cable connected to the rear surveillance camera through the through hole formed at the attachment position of the counterweight. An effect similar to the above can be obtained.

(G)
In the said embodiment, the attachment structure of the back surveillance camera which concerns on this invention was given and demonstrated with the example applied with respect to the hydraulic shovel 1. FIG. However, the present invention is not limited to this.
For example, it is naturally applicable to other construction machines such as a wheel loader and a hydraulic crane.

  The mounting structure of the rear surveillance camera of the present invention has the effect of protecting the cable of the rear surveillance camera without increasing the number of parts, so that not only a hydraulic excavator but also a wheel loader, a hydraulic claim car, etc. It can be widely applied to other construction machines.

The perspective view which shows the structure of the whole hydraulic excavator which employ | adopted the attachment structure of the back surveillance camera which concerns on one Embodiment of this invention. The perspective view which shows the structure of the attachment structure periphery of the rear surveillance camera attached to the back of the hydraulic excavator of FIG. FIG. 3 is a side sectional view showing a configuration of a mounting structure for the rear monitoring camera in FIG. 2. FIG. 3 is a front sectional view showing a configuration of a mounting structure of the rear monitoring camera in FIG. 2. FIG. 4 is an enlarged side sectional view showing a configuration of a mounting structure for the rear monitoring camera in FIG. 3. FIG. 6 is an internal cross-sectional view showing a state in a counterweight of a cable extending from the rear monitoring camera of FIG. 5. (A), (b) is the top view and side view which show the structure of the lower casing which comprises the casing which accommodates the back surveillance camera of FIG. (A), (b) is the top view and side view which show the state which attached the bracket member with respect to the lower casing of FIG. (A), (b) is the top view and side view which show the structure of the upper casing which comprises the casing which accommodates the back surveillance camera of FIG. (A)-(c) is the top view, side view, and front view which show the structure of the cover member which comprises the casing which accommodates the back surveillance camera of FIG. (A)-(c) is the top view, front view, and side view which show the structure of the pipe material for letting the cable extended from the back surveillance camera of FIG. 5 pass. The perspective view which shows the structure of the sponge material attached to one edge part of the pipe material of FIG. The side view which shows the structure of the angle adjustment mechanism which adjusts the attachment angle of the rear monitoring camera of FIG. FIGS. 14A to 14C are a plan view, a side sectional view, and a front sectional view showing a configuration of an angle adjustment bracket included in the angle adjustment mechanism of the rear monitoring camera in FIG. 13.

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Swivel base 4 Working machine 5 Counterweight 5a Through hole 6 Engine 9 Equipment room 10 Cab 11 Boom 12 Arm 13 Bucket 20 Mounting structure 21 Casing (support case)
22 Rear surveillance camera 23 Cable 25 Bracket member 25a First bracket 25b Second bracket 25c Third bracket 25d Bolt hole 25e, 25f Nut portion 25g Bolt hole 30 Pipe material 30a Main body 30b Upper surface opening 30c End portion opening 31 Lower casing 31a Bolt hole 31b Recess (opening)
31c Peep hole 32 Upper casing 32a Cover mounting part 32b Bolt hole 32c, 32d Locking groove 33 Cover member 33a, 33b Claw member 41 Buffer member 41a First sponge part 41b Cable hole 41c Second sponge part 42 Positioning bracket 42a Long hole 42b Positioning seal 42c Bolt hole 43 Angle adjusting mechanism 51, 52 Bolt 53 Positioning bolt 54 Connecting portion 55, 56 Boss 57 Bolt

Claims (5)

A rear monitoring camera installed on a counterweight mounted on the rear of the construction machine;
A through hole formed in the upper surface of the counterweight;
It has a concave opening that supports the rear monitoring camera and allows a cable connected to the rear monitoring camera to pass therethrough, so that the opening and the through hole communicate with each other with respect to the upper surface of the counterweight. A support case attached using fixing bolts;
A cover member attached to a position covering the fastening portion of the fixing bolt with respect to the support case;
The rear surveillance camera mounting structure comprising: The cover member is attached by elastically deforming a part of the cover member or a part of the attachment destination member.
The rear surveillance camera mounting structure according to claim 1. A pipe member that has one end communicating with the through-hole formed in the counterweight and the other end communicating with a construction vehicle main body to which the counterweight is attached;
The rear surveillance camera mounting structure according to claim 1 or 2. The opening portion on the one end side of the pipe material is closed,
The rear surveillance camera mounting structure according to claim 3. In the inside of the support case, there is provided an alignment unit that serves as an index of angle adjustment of the rear monitoring camera.
The rear surveillance camera mounting structure according to any one of claims 1 to 4 .

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