JP4936979B2 - Cabin open / close front window seal structure - Google Patents

Description

  The present invention relates to a seal structure when fully closed in an openable front window that is used in a cabin of a work machine such as a construction machine or an application machine thereof, and the front part of the cabin is opened by moving the front window upward.

  In a construction machine such as a hydraulic excavator, for example, Patent Document 1 describes a cabin front window that is slidable from the front part to the ceiling part, that is, capable of opening and closing. The reason why the front window can be opened and closed in this way is that when excavating a deep excavation site, the front window is moved to the ceiling side, and the operator protrudes the head from the front of the cabin and This is for enabling visual inspection. In a cabin having such a sliding open / close front window, when the front window is closed, the front surface of the four edges of the glass of the front window has elasticity called a weather strip made of rubber or the like provided on the cabin body. It has a structure in which a seal is made against the sealing member that it has.

Japanese Utility Model Publication No. 5-37525

  The cabin window may be cleaned by spraying high pressure cleaning water to remove dirt. In the conventional seal structure of the front window, a seal member called a weather strip provided on the cabin main body side is deformed by the pressure of the high-pressure washing water to create a gap between the seal member and the front window. Therefore, there is a possibility that the high pressure washing water may enter the cabin.

  In view of the above problems, an object of the present invention is to provide a seal structure for a cabin front window having a structure that prevents water from entering the cabin during washing with high-pressure washing water.

The cabin opening and closing front window seal structure according to claim 1 is a work machine cabin in which a rectangular front window is mounted so as to be movable from the front to the ceiling in the cabin.
At least one edge of the four edges of the front window is provided with a protruding part that partially or entirely protrudes forward from the front surface of the front window,
In the closed state of the front window, the protruding portion provided on the outer peripheral side of the front window is brought into contact with the sealing member having elasticity provided in the opening of the cabin main body with respect to the seal member. .

The cabin opening / closing front window sealing structure according to claim 2 is the cabin opening / closing front window sealing structure according to claim 1,
The protruding portion is formed by a part of a coupling member that couples the front window and its frame.

The cabin opening / closing front window sealing structure according to claim 3 is the cabin opening / closing front window sealing structure according to claim 1,
The protrusion is formed by a part of a frame provided on a back surface around the front window.

The cabin opening / closing front window sealing structure according to claim 4 is the cabin opening / closing front window sealing structure according to claim 1,
The protrusion is made of a member fixed to the front window.

The cabin opening / closing front window sealing structure according to claim 5 is the cabin opening / closing front window sealing structure according to claim 1,
The protrusion is made of a member fixed to a frame provided on a back surface around the front window.

The cabin opening / closing front window sealing structure according to claim 6 is the cabin opening / closing front window sealing structure according to claim 5,
The member fixed to the frame and constituting the protrusion is made of rubber.

According to the first aspect of the present invention, in a state where the front window is closed, the sealing member having elasticity provided in the opening of the cabin body is applied to the protruding portion provided on the outer peripheral side of the front window from the sealing member. since was contact, when cleaning the front window by a high pressure washing water, and be subjected to pressure of the high-pressure washing water by protrusions. For this reason, movement and deformation of the seal portion of the seal member are suppressed, thereby preventing a gap from being generated between the seal portion and the front window, and the protruding portion acts as a weir to block water. By doing so, entry of high-pressure washing water into the cabin is prevented.

  According to invention of Claim 2, since a protrusion part is formed by the coupling member of a front window and its frame, it can carry out by the change of the structure of a coupling member, it is not necessary to add a new member, and there is no number of parts. There is an advantage that the increase can be suppressed.

  According to the invention of claim 3, since the projecting portion is formed by the frame of the front window, it can be implemented by changing the structure of the frame, there is no need to add a new member, and the increase in the number of parts can be suppressed. There is.

  According to invention of Claim 4, since a protrusion part is formed by the member fixed to the front surface of a front window, there exists an advantage that it can apply also to the existing front window.

  According to the fifth aspect of the present invention, since the member constituting the projecting portion is composed of a member fixed to the frame, there is an advantage that it can be applied to an existing front window.

  According to the sixth aspect of the present invention, the rubber provided on the frame of the front window is provided as the protruding portion, and the rubber is brought into contact with the sealing portion of the sealing member. Therefore, variations in manufacturing dimensions of the cabin and the front window, a combination error, and the like can be easily absorbed, and air-tightness can be reliably ensured.

  FIG. 1 is a side view showing a hydraulic excavator as an example of a working machine to which a seal structure of the present invention is applied. In this working machine, an upper swing body 3 is installed on a lower traveling body 1 via a swing device 2, and a power unit 5 and a cabin 6 are mounted on the upper swing body 3 and a work front 7 is attached. . The working front 7 is attached to the boom 9 that is raised and lowered by the boom cylinder 8, the arm 11 that is rotated by the arm cylinder 10, the arm 11 that is rotated by the arm cylinder 10, and the bucket cylinder 12. And a bucket 13 provided as a working tool rotated by the. The working machine to which the present invention is applied may be variously changed according to the purpose of the work, such as changing or adding a part of the work front 7 to a telescopic type or adding a multi-stage joint structure. Configured. As the work tools, those suitable for the purpose of work such as excavation, crushing, and dismantling are attached.

2 is a side sectional view showing an example of the cabin 6, FIG. 3 is a front view showing the front surface thereof, and FIG. 4 is a rear view of the front window thereof. As shown in FIG. 2, a driver's seat 21 is installed in the cabin 6 , and guide grooves 18 are provided from the left and right of the front portion in the cabin 6 to the left and right of the ceiling portion, and are provided on the upper and lower portions of the front window 15. By attaching a roller 20 (see FIG. 4) along the guide groove 18 so as to roll, the front window 15 can be moved from the front part of the cabin 6 to the ceiling part. In the open state in which the front window 15 is moved to the ceiling, the operator in the cabin 6 can project the head forward from the front of the cabin 6 and visually observe the excavation location of the bucket 13 as a work tool. Therefore, even when the excavation site is deep, it is possible to know the excavation situation.

  3 and 4, reference numeral 6 a denotes a reinforcing member, and the reinforcing member 6 a is fixedly attached to the cabin 6 by welding along the opening edge portion for mounting the front window 15 on the front surface of the cabin 6. Reference numeral 16 denotes a seal member made of an elastic material such as rubber provided so as to cover the opening edge portion formed of the reinforcing member 6a of the cabin 6, and this seal member 16 is usually called a weather strip. When the front window 15 is closed as shown in FIGS. 5 (A) to 5 (C), the seal member 16 is in contact with the front surface of the four circumferences of the front window 15 having a square shape with a hollow seal portion 16a. By sealing, the space between the front window 15 and the cabin 6 is sealed. Reference numerals 17a, 17b, and 17c denote an upper frame, a side frame, and a lower frame that fix the front window 15, respectively.

  In FIG. 5, reference numeral 19 denotes a coupling member for fixing the front window 15 to the upper frame 17a, the side frame 17b, and the lower frame 17c, and the coupling member 19 is made of rubber or synthetic resin. The coupling member 19 has one groove 19a fitted into the upper frame 17a, the side frame 17b, and the lower frame 17c, and the other groove 19b fitted into the four circumferences of the front window 15 to attach the front window 15 to the upper frame 17a, side frame 17b, It fixes to the frame assembled with the lower frame 17c. Thus, in a state where the front window 15 is fixed to the upper frame 17a, the side frame 17b, and the lower frame 17c by the coupling member 19, a part 19c of the coupling member 19 projects forward from the front surface of the front window 15.

Thus, in the state which provided the protrusion part 19c which protrudes from the front surface of the front window 15 in the coupling member 19, and closed the front window 15, this protrusion part 19c is shown in FIG. 5 (A)-(C). Is in contact with the seal portion 16a of the seal member 16 attached to the reinforcing member 6a. As shown in FIG. 5A, the coupling member 19 between the upper frame 17a and the upper portion of the front window 15 abuts on the seal portion 16a of the seal member 16 from above. Further, as shown in FIG. 5B, the coupling member 19 between the side frame 17b and the side portion of the front window 15 abuts on the outer side of the seal member 16 (the outer peripheral side of the front window). Further, as shown in FIG. 5C, the coupling member 19 between the lower frame 17 c and the lower portion of the front window 15 also comes into contact with the seal portion 16 a of the seal member 16 from above. In any case of FIGS. 5A to 5C, the protruding portion 19 c is located on the outer peripheral side of the front window 15 relative to the seal member 16.

When the front window 15 is closed as described above, the front window 15 is filled with the high-pressure washing water 22 at the upper, side and lower portions of the front window 15 as shown in FIGS. 5 (A), (B) and (C). In the case of cleaning the front surface of the slab, even if the high-pressure cleaning water 22 collides with the seal part 16a, the seal part 16a contacts and is supported by the protruding part 19c of the coupling member 19 on the outer peripheral side of the front window 15 relative to the seal member 16. Therefore, the seal portion 16a is moved and deformed to prevent a gap from being formed between the front surface of the front window 15 and the protruding portion 19c serves as a weir to block water. Intrusion of high-pressure washing water into the cabin 6 is prevented. In this embodiment, a part of the coupling member 19 is projected from the front surface of the front window 15, and the projecting portion 19 c is formed by the coupling member 19 of the front window 15 and its frames 17 a to 17 c. This can be implemented by changing the structure of the member 19, and there is an advantage that it is not necessary to add a new member and an increase in the number of parts can be suppressed.

FIG. 6 shows another embodiment of the seal structure of the present invention, and FIGS. 6A, 6B and 6C are cross-sectional views showing the seal structure of the upper, side and lower parts of the front window, respectively. . In this embodiment, the frame 17a, 17b, 17c of the front window 15 is provided with projections 17d, 17e, 17f projecting forward from the front surface of the front window 15, respectively, and in the state where the front window 15 is closed, these The projecting portions 17d, 17e, and 17f are brought into contact with the seal portion 16a of the seal member 16, respectively. Here, in a state where the front window 15 is closed, the protruding portion 17d of the upper frame 17a contacts the upper portion of the seal portion 16a of the seal member 16 as shown in FIG. Further, as shown in FIG. 6B, the protruding portion 17e of the side frame 17b contacts the outside of the seal portion 16a (the outer peripheral side of the front window). Further, as shown in FIG. 6C, the projecting portion 17f of the lower frame 17c contacts the lower portion of the seal portion 16a. 6A to 6C, the protrusions 17 d, 17 e, and 17 f are located on the outer peripheral side of the front window 15 relative to the seal member 16. Reference numeral 23 denotes a synthetic resin that joins between the frames 17a, 17b, and 17c and the front window 15.

  In this embodiment, the pressure of the high-pressure cleaning water 22 is received by the projecting portions 17d, 17e, and 17f through the seal portion 16a, and the front window 15 due to movement and deformation of the seal portion 16a due to the pressure of the high-pressure cleaning water 22 is used. And the protrusions 17d, 17e, and 17f function as weirs to block water, thereby preventing the high-pressure cleaning water 22 from entering the cabin 6. can do. In this embodiment, since the projections 17d to 17f are formed by the frame 17a to 17c of the front window, it can be implemented by changing the structure of the frame, there is no need to add a new member, and an increase in the number of parts is suppressed. There is an advantage that

  FIG. 7 shows another embodiment of the seal structure of the present invention, and FIGS. 7A, 7B and 7C are cross-sectional views showing the seal structure of the upper, side and lower parts of the front window, respectively. . In this embodiment, a member 24 protruding from each front surface is fixed to each front surface of the upper portion, side portion, and lower portion of the front window 15. In this example, the protruding member 24 is rubber, and an example in which the rubber is bonded and fixed is shown. In this embodiment, in a state where the front window 15 is closed, the projecting member 24 contacts the outside of the seal portion 16a (the outer peripheral side of the front window).

In this embodiment, as shown in FIGS. 7A, 7B, and 7C, when the front surface of the front window 15 is washed with the high-pressure washing water 22, the high-pressure washing water 22 collides with the seal portion 16a. However, since the seal portion 16a is in contact with and supported by the projecting member 24 located on the outer peripheral side of the front window 15 relative to the seal member 16 , the seal portion 16a moves and deforms to contact the front surface of the front window 15. A gap is prevented from occurring between them, and the protruding member 24 acts as a weir to block water, thereby preventing high-pressure cleaning water from entering the cabin 6. This embodiment has an advantage that it can be applied to an existing front window because the protruding portion is formed by the protruding member 24 fixed to the front surface of the front window 15.

  FIG. 8 is a sectional view showing another embodiment of the sealing structure of the present invention with respect to the upper portion of the front window, and FIG. 9 is a sectional view showing the sealing structure of this embodiment with respect to the side portion of the front window. In FIGS. 8 and 9, reference numerals 17a and 17b denote an upper frame and a side frame fixed to the back surface around the front window 15 with a synthetic resin 23, respectively. Reference numeral 25 denotes a rubber provided as a member constituting a projecting portion that abuts and supports the seal portion 16, and the rubber 25 is fixedly attached to the outer peripheral portions of the upper frame 17a and the side frame 17b by bonding or screws. . The rubber 25 is provided so as to extend from the periphery of the front window 15 to the front of the front window 15. Such a seal structure may be provided on the lower frame 17c with a similar structure.

  According to this embodiment, since the member which comprises a protrusion part is fixed and provided in frame 17a, 17b of the front window 15, there exists an advantage that it can apply also to the existing front window 15. FIG. Further, since the rubber 25 is brought into contact with the seal portion 16a of the seal member 16, the elastic members are brought into contact with each other to ensure air-tightness. Easily absorbs combination errors and ensures airtightness.

  When carrying out the present invention, the structure of FIGS. 5 to 9 is combined, that is, for example, the upper part of the front window 15 takes any of the structures of FIGS. May adopt other structures shown in FIGS. Further, the front window of the cabin 6 is composed of one piece as shown in the above embodiment, and a lower fixed window with a small vertical width and an upper openable front window with a large vertical width. However, the present invention can also be applied to the seal of the upper opening / closing front window having such a divided structure. In addition, the seal structure of the present invention is not applied to all four edges of the front window, but the seal structure of the present invention is applied to a part of the edges, for example, applied to the upper part or the side part or only the upper part and the side part. May be.

It is a side view which shows an example of the working machine which has a cabin which applies the seal structure of this invention. It is side surface sectional drawing of the cabin of the working machine of FIG. It is a front view which shows the front surface of the cabin of FIG. It is a rear view of the front window of the cabin of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a seal structure for a cabin open / close front window according to the present invention, wherein (A), (B), and (C) are cross-sectional views showing the upper, side, and lower structures, respectively. is there. FIG. 3 shows another embodiment of the seal structure of the cabin openable front window according to the present invention, and (A), (B), and (C) are cross-sectional views showing the upper, side, and lower structures, respectively. It is. FIG. 3 shows another embodiment of the seal structure of the cabin openable front window according to the present invention, and (A), (B), and (C) are cross-sectional views showing the upper, side, and lower structures, respectively. It is. FIG. 6 is a cross-sectional view showing a sealing structure of an upper part of a front window according to another embodiment of the present invention, which shows a sealing structure of a front window of a cabin. It is sectional drawing which shows the example of application to the side part of the front window of the seal structure of FIG.

1: Lower traveling body, 2: Turning device, 3: Upper turning body, 5: Power unit, 6: Cabin, 6a: Reinforcing member, 7: Front for work, 8: Boom cylinder, 9: Boom, 10: Arm cylinder, 11: arm, 12: bucket cylinder, 13: bucket, 15: front window, 17a: upper frame, 17b: side frame, 17c: lower frame, 18: guide groove, 19: coupling member, 19a, 19b: groove, 19c : Protruding part, 20: Roller, 21: Driver's seat, 22: High pressure washing water, 23: Rubber, 24: Protruding member, 25: Rubber

Claims (6)

In a cabin for a work machine in which a rectangular front window is mounted so as to be movable from the front to the ceiling in the cabin,
At least one edge of the four edges of the front window is provided with a protruding part that partially or entirely protrudes forward from the front surface of the front window,
In the closed state of the front window, the protruding portion provided on the outer peripheral side of the front window is brought into contact with the sealing member having elasticity provided in the opening of the cabin main body with respect to the seal member. Cabin open / close front window seal structure. In the seal structure of the openable front window of the cabin according to claim 1,
The opening / closing front window sealing structure for a cabin, wherein the protruding portion is formed by a part of a coupling member that couples the front window and its frame. In the seal structure of the openable front window of the cabin according to claim 1,
The opening / closing front window sealing structure for a cabin, wherein the protruding portion is formed by a part of a frame provided on a back surface around the front window. In the seal structure of the openable front window of the cabin according to claim 1,
The seal structure of the openable / closable front window of the cabin, wherein the protruding portion is made of a member fixed to the front window. In the seal structure of the openable front window of the cabin according to claim 1,
The opening / closing front window sealing structure for a cabin, wherein the protrusion is made of a member fixed to a frame provided on a back surface around the front window. In the seal structure of the openable front window of the cabin according to claim 5,
A seal structure for an openable front window of a cabin, characterized in that a member fixed to the frame and constituting a projecting portion is made of rubber.

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