JP2008273414A - Seal structure of openable type windshield of cabin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal structure of a cabin windshield capable of surely preventing water from entering inside of a cabin at the time of washing with high-pressure cleaning water. <P>SOLUTION: A square windshield 15 is movably mounted across a ceiling part from a front part of a cabin 1. While the windshield 15 is closed, a seal member 16 contacting front faces of four corners of the windshield is provided to an opening of a cabin body 6a. A projection member 17 projecting forward of the windshield to approach or partially contact the seal member 16 while the windshield 15 is closed is affixed to a portion nearer a center of the windshield 15 than a portion overlaid on the seal part 16a of the seal member 16 on a front face at least one of four corners of the windshield. The projection member 17 prevents high-pressure cleaning water from directly colliding with the seal part 16a at the time of cleaning, prevents deformation of the seal part 16a of the seal member 16 due to the high-pressure cleaning water, and surely prevents the cleaning water from entering the cabin 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an open / close 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. The present invention relates to a seal structure at times.

  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 front window seal structure, a flexible seal member called a weather strip provided on the cabin body side is deformed by the pressure of high-pressure washing water, and a gap is formed between the seal member and the front window. In some cases, high-pressure washing water may enter the cabin through the gap. Therefore, the present applicant has modified the front window frame material and the mounting member for fixing the frame material to the front window to provide a protruding portion that protrudes in front of the front window, and makes the protruding portion contact the seal member. Developed a seal structure that prevents the high pressure cleaning water from entering the cabin by preventing the gap between the sealing member and the front window due to the pressure of the high pressure cleaning water, and filed as Japanese Patent Application No. 2006-315596. did.

  The present invention relates to an improvement in the seal structure according to the prior application, and an object thereof is to provide a seal structure for a cabin front window that can more reliably prevent water from entering the cabin during washing with high-pressure washing water. To do.

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 part of the cabin to the ceiling part.
In the closed state of the front window, a seal member that is brought into contact with the front surface of the four edges of the front window is provided in the front opening of the cabin body,
Close to the seal member in the closed state of the front window at a position closer to the center of the front window than a position where the seal portion of the seal member of the front window front surface overlaps at least one of the four edges of the front window. A protruding member protruding in front of the front window is fixed so as to partially contact.

  According to the present invention, when the front window is cleaned with the high-pressure cleaning water, the high-pressure cleaning water first collides with the protruding member, and the direct collision of the high-pressure cleaning water with the seal portion of the seal member is prevented. For this reason, deformation of the seal portion of the seal member due to the high-pressure washing water is prevented, and a gap is prevented from being generated between the seal portion and the front window, so that the high-pressure washing water can surely enter the cabin. Is prevented.

  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, a cabin 6 and the like 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.

  FIG. 2 is a side sectional view showing an example of the cabin 6, and FIG. 3 is a front view showing the front surface of the cabin 6 with the front window 15 closed. As shown in FIG. 2, a driver's seat 21 is installed in the cabin 6 in the cabin body 6a. A guide groove 18 is provided from the left and right of the front portion of the cabin 6 to the left and right of the ceiling portion, and rollers 20 provided on the left and right of the upper and lower portions of the front window 15 are mounted so as to roll along the guide groove 18. The window 15 is movable 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.

  In FIG. 3, reference numeral 16 denotes a seal member made of an elastic material such as rubber provided at the front opening of the cabin body 6a. This seal member 16 is usually called a weather strip. 4, 5, and 6 are cross-sectional views showing an upper portion, a side portion, and a lower portion of the front window in a closed state of the front window, respectively. As shown in FIGS. 4 to 6, when the front window 15 is closed, the seal portion 16 a formed in a hollow shape of the seal member 16 comes into contact with the front surface of the four circumferences of the front window 15 having a quadrangular shape, The space between the front window 15 and the cabin 6 is sealed.

  Reference numeral 17 denotes a protruding member fixed to the front surface of the four edges of the front window 15. The projecting member 17 is attached to a portion closer to the center of the front window 15 than the front window 15 that overlaps the seal member 16 when the front window 15 is closed. Are provided so that a part of the abutment comes into contact with each other or as shown in the drawing. The projecting member 17 is preferably made of plastic or rubber, and is fixed to the front surface of the front window 15 by adhesion or welding. These projecting members 17 may be one continuous member over four edges, or may be divided into a plurality of parts such as independent for each edge.

  In this embodiment, when the front window 15 is washed with the high-pressure washing water ejected as shown by arrows a to f in FIGS. 4 to 6, the high-pressure washing water first collides with the projecting member 17, and the sealing member 16 It is possible to prevent the high-pressure washing water from directly colliding with the seal portion 16a.

  Here, rather than the high-pressure washing water from an angle relatively perpendicular to the front surface of the front window 15 as indicated by arrows a, c, and e, as indicated by arrows b, d, and f, the seal portion 16a is indicated. When the high-pressure cleaning water collides from a direction close to parallel to the surface of the front window 15, the seal portion 16 a of the seal member 16 is more likely to be turned over. Since the collision with the seal portion 16a of the high-pressure washing water can be almost completely prevented, it is almost completely prevented that the seal portion 16a is turned over by the high-pressure washing water, that is, a gap is generated between the seal portion 16a and the front window 15. It is possible to prevent the high pressure cleaning water from entering the cabin 6 with certainty.

  In order to prevent the high pressure cleaning water from entering the cabin 6 with certainty, in order to prevent the protruding member 17 from directly colliding with the seal portion 16a of the high pressure cleaning water, as shown in the figure, the front window 15 of the protruding member 17 is used. It is preferable to make the protrusion width from the front surface larger than the thickness of the seal portion 16a when the front window 15 is closed (the portion excluding the portion of the seal member 16 sandwiching the cabin body 6a).

  When carrying out the present invention, the front window of the cabin 6 is composed of one piece as shown in the above embodiment, a lower fixed window having a small vertical width, and an upper openable front window having 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 sectional drawing which shows the seal structure of the upper part of the front window of this Embodiment. It is sectional drawing which shows the seal structure of the side part of the front window of this Embodiment. It is sectional drawing which shows the seal structure of the lower part of the front window of this Embodiment.

Explanation of symbols

1: Lower traveling body, 2: Turning device, 3: Upper turning body, 5: Power unit, 6: Cabin, 6a: Cabin body, 7: Front for work, 8: Boom cylinder, 9: Boom, 10: Arm cylinder, 11: Arm, 12: Bucket cylinder, 13: Bucket, 15: Front window, 16: Seal member, 17: Protruding member, 18: Guide groove, 20: Roller, 21: Driver's seat

Claims (1)

In a cabin for a work machine in which a rectangular front window is movably mounted from the front part of the cabin to the ceiling part,
In the closed state of the front window, a seal member that is brought into contact with the front surface of the four edges of the front window is provided in the front opening of the cabin body,
Close to the seal member in the closed state of the front window at a position closer to the center of the front window than a position where the seal portion of the seal member of the front window front surface overlaps at least one of the four edges of the front window. A seal structure for an openable / closable front window of a cabin, wherein a projecting member projecting forward of the front window is fixed so as to partially abut.

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