JP2015107741A - Guide rail structure of front window - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce impact that occurs when a front window is closed, in a work vehicle equipped with the front window that can open/close to a close position where a window opening part of a front side of an operator room is closed and an open position where the window opening part is opened by being stored in an operator room ceiling part.SOLUTION: At a close position side end part of an upper side guide rail part 8A which guides, for free movement, an upper side roller 4 attached at an upper part of a front window 3, an inclination part 8AaX for deceleration is provided which is inclined so that a groove bottom surface of a roller guide groove 8Aa rises as advances to a close position side. At a stage before a lower side roller 5 reaches a closing position side terminal position when the front window 3 is closed, the upper side roller 4 causes the inclination part 8AaX for deceleration to rise toward a close position side, so that closing speed of the front window 3 is decelerated.

Description

  The present invention relates to a technical field of a guide rail structure for a front window provided in a cab of a work vehicle such as a hydraulic excavator.

  Generally, in the front window provided in the cab of a work vehicle such as a hydraulic excavator, a closed position that closes the window opening on the front of the cab and an open position that is housed in the cab ceiling and opens the window opening Some are configured to be openable and closable. In this device, the pair of left and right guide rails that guide the opening and closing movement of the front window are usually arranged so as to extend in the front-rear direction along the ceiling surface of the cab, and freely move the upper roller attached to the upper part of the front window. And an upper guide rail portion that is arranged so as to extend vertically along the front surface of the cab and that guides the lower roller attached to the lower portion of the front window to be movable. However, as a guide rail having an upper guide rail portion and a front guide rail portion in this way, conventionally, the roller guide groove of the upper guide rail portion and the roller guide groove of the front guide rail portion are not made continuous. What was comprised is known (for example, refer patent document 1).

JP 2009-173228 A

  By the way, for example, a front window provided in a cab (operator's cab) of a hydraulic excavator is required to be as large as possible in order to ensure a wide field of view for the operator. Impact occurs when closed. In particular, in the case of a guide rail configured such that the roller guide groove of the upper guide rail portion and the roller guide groove of the front guide rail portion described above are not continuous, the lower roller is the lower end portion of the front guide rail portion when the front window is closed. Since the upper roller reaches the front end of the upper guide rail at the same time as it reaches, impact will be applied to the upper and lower parts of the front window, but if the impact when closing the front window is large, stepping stones etc. There is a concern that the window glass may be damaged starting from the scratches generated in step 1. There is a problem to be solved by the present invention.

The present invention was created in view of the above-described circumstances to solve these problems. The invention of claim 1 is a closed position for closing the window opening on the front of the cab and the cab. In a working vehicle provided with a front window that can be opened and closed at an open position that is housed in the ceiling and opens the window opening, a pair of left and right guide rails that guide the opening and closing of the front window are provided on the cab ceiling surface. An upper guide rail portion having a roller guide groove which is arranged so as to extend in the front-rear direction and movably guides the upper roller attached to the upper portion of the front window, and extends in the vertical direction along the front surface of the cab And a front guide rail portion having a roller guide groove that movably guides the lower roller attached to the lower portion of the front window. In this case, the roller guide groove of the upper guide rail portion is closed. Position side Is provided with a decelerating inclined portion inclined so that the groove bottom surface becomes higher toward the closed position side, and the upper roller is in the decelerating inclination stage before the lower roller reaches the closed position side end of the front guide rail portion. A guide rail structure for a front window, characterized in that the closing speed of the front window is reduced by moving the portion upward toward the closed position.
According to a second aspect of the present invention, in the first aspect, the speed-decreasing inclined portion is formed in an arc shape centering on the lower roller when the upper roller is positioned at the open position side end of the speed-decreasing inclined portion. It is the guide rail structure of the front window which is characterized.
According to a third aspect of the present invention, in the first or second aspect, the upper guide rail portion includes an extension portion that extends linearly toward the front surface of the cab at the closed position side end portion closer to the closed position side than the deceleration inclined portion. This is a guide rail structure of a front window characterized by the above.

According to the first aspect of the present invention, before the lower roller reaches the closed position side end, the upper roller moves upward toward the closed position side by the upper roller so that the closing speed of the front window is increased. As a result, the impact on the upper and lower parts of the front window can be reduced when the front window is closed, and the window glass starts from scratches caused by stepping stones due to the impact at the time of closing. It is possible to avoid a problem such as damage. In addition, when the front window is opened, the upper roller moves downward toward the open position with the deceleration inclined portion, so that the deceleration inclined portion becomes a resistance to the operation of opening the front window. It can be avoided reliably.
By setting it as invention of Claim 2, the operating force when an upper roller raises and moves the deceleration inclination part can be lightened.
According to the third aspect of the present invention, the upper roller is guided toward the front surface of the cab by the extension portion at the closed position side end portion, thereby preventing the intrusion of rainwater in which the front window is attached to the peripheral portion of the window opening. Therefore, the sealing performance between the front window and the sealing member at the peripheral edge of the window opening can be reliably ensured. Further, the upper roller is guided toward the front surface of the cab by the extension at the closed position side end portion, so that the front window is also pressed against the lower window arranged on the lower side of the front window, As a result, the seal member between the front window and the lower window can be compressed without any deviation, and the sealing performance between the front window and the lower window can be ensured reliably.

It is a side view of a cab. It is a figure which shows a state when closing a front window. It is a figure which shows a state when a front window is in the middle of opening and closing. It is an enlarged view which shows the closed position side part of an upper side guide rail part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a cab (corresponding to a driver's cab of the present invention) provided in a work vehicle such as a hydraulic excavator. In the present embodiment, the cab 1 has a substantially rectangular parallelepiped shape. Has a window opening 2a. Reference numeral 3 denotes a front window that opens and closes the window opening 2a. The front window 3 is configured by assembling a transparent plate such as a glass plate on the upper, lower, left, and right window frames. A pair of left and right upper rollers 4 and lower rollers 5 are rotatably attached to upper and lower portions on both left and right sides via brackets 6 and 7, respectively. The upper window 4 and the lower roller 5 are guided by a pair of left and right guide rails 8 to be described later, whereby the front window 3 is stored in the closed position where the window opening 2a is closed and in the ceiling portion of the cab 1. Thus, it is configured to open and close to an open position where the window opening 2a is opened. The front window 3 in the closed position and the open position is locked at each position by a lock device (not shown). Although not shown, the front window 3 is provided with a handle that is gripped by an operator when the front window 3 is opened and closed. Further, in the figure, 11 is a lower window provided on the lower side of the front window 3 on the cab front surface 2.

  The guide rail 8 includes an upper guide rail portion 8A disposed so as to extend in the front-rear direction along the ceiling surface 9 of the cab 1, and a front guide disposed so as to extend in the vertical direction along the front surface 2 of the cab 1. The rail portion 8 </ b> B and an R-shaped corner guide rail portion 8 </ b> C arranged at the corner portion between the front surface 2 and the ceiling surface 9 of the cab 1 are formed.

  The upper guide rail portion 8A, the front guide rail portion 8B, and the corner guide rail portion 8C are all roller guide grooves 8Aa and 8Ba having a U-shaped cross section in which the upper roller 4 or the lower roller 5 is movably fitted. 8Ca, the roller guide groove 8Ba of the front guide rail portion 8B and the roller guide groove 8Ca of the corner guide rail portion 8C are continuous, while the roller guide groove 8Aa of the upper guide rail portion 8A is It is located above the roller guide groove 8Ca of the corner guide rail portion 8C, and is configured not to be continuous with the front guide rail portion 8B and the roller guide grooves 8Ba, 8Ca of the corner guide rail portion 8C. The lower roller 5 is movably guided in the roller guide grooves 8Ba and 8Ca of the continuous front guide rail portion 8B and corner guide rail portion 8C, and the lower roller 5 Is located at the lower end of the roller guide groove 8Ba of the front guide rail 8B when the front window 3 is in the closed position, and at the rear end of the roller guide groove 8Ca of the corner guide rail 8C when the front window 3 is in the open position. It is set to be located.

  The roller guide groove 8Aa of the upper guide rail portion 8A is configured such that the upper roller 4 is movably guided. The upper roller 4 is configured so that the upper guide rail portion is in the closed position when the front window 3 is in the closed position. The roller guide groove 8Aa is positioned at the front end of the roller guide groove 8Aa, and is set to be positioned at the rear end of the roller guide groove 8Aa when the front window 3 is in the open position. At the closed position side end portion (front end portion) of 8Aa, a speed reducing inclined portion 8AaX is formed such that the groove bottom surface is inclined higher toward the closed position side. The deceleration inclined portion 8AaX is formed in an arc shape centering on the lower roller 5 when the upper roller 4 is located at the closed position side end of the deceleration inclined portion 8AaX (the rear end of the deceleration inclined portion 8AaX). The lower roller 5 is configured to stop while the upper roller 4 is moving on the deceleration inclined portion 8AaX. When closing the front window 3 in the open position, the front roller 3 is guided by the roller guide groove 8Aa of the upper guide rail portion 8A, and the lower roller 5 is driven by the corner guide rail portion 8C and the front guide rail portion. The roller 5 moves toward the closed position while being guided by the roller guide grooves 8Ca and 8Ba of the 8B. In this case, the lower roller 5 is moved to the closed position side end of the roller guide groove 8Ba of the front guide rail portion 8B (roller guide groove). The upper roller 4 is configured to move up the deceleration inclined portion 8AaX toward the closed position before reaching the lower end position of the 8Ba, and thus, before reaching the closed position. Since the closing speed of the front window 3 can be reduced, and the deceleration inclined portion 8AaX is formed in an arc shape with the lower roller 5 as the center, Roller 4 is adapted to be able to reduce the operating force at the time of upward movement of the deceleration gradient portion 8AaX. On the other hand, when the front window 3 is opened, the upper roller 4 moves downward toward the open position with respect to the deceleration inclined portion 8AaX, so that the deceleration inclined portion 8AaX does not become a resistance to the operation of opening the front window 3. ing.

Further, in the roller guide groove 8Aa of the upper guide rail portion 8A, an extension portion 8AaY extending linearly toward the cab front surface 2 is formed at the closed position side end portion on the closed position side with respect to the deceleration inclined portion 8AaX. The upper roller 4 can be linearly guided toward the cab front surface 2 by the extension 8AaY. Then, the upper roller 4 is linearly guided toward the cab front surface 2 at the closed position side end portion, so that the rainwater intrusion preventing seal member 10 attached to the peripheral edge portion of the window opening 2a can be prevented. The front window 3 can be pressed substantially vertically, and the front window 3 can be pressed against the lower window 11 disposed on the lower side of the front window 3. The front window 3 is configured to be locked in the closed position by a locking device.
In addition, a bent portion 8BaZ that is bent obliquely downward and forward is formed at the closed position side end portion of the roller guide groove 8Ba of the front guide rail portion 8B (lower end portion of the roller guide groove 8Ba). The bent portion 8BaZ is configured to guide the lower roller 5 when the upper roller 4 moves along the deceleration inclined portion 8AaX and the extended portion 8AaY. The lower end portion of the bent portion 8BaZ is It is the closed position side end position of the lower roller 5.

  On the other hand, 12 is an assist cable, and the front end side of the assist cable 12 is connected to the lower part of the front window 3 via a link 13. On the other hand, the proximal end side of the assist cable 12 is a cable guide groove provided in the front guide rail portion 8B, the corner guide rail portion 8C, and the upper guide rail portion 8A in a state of being juxtaposed with the roller guide grooves 8Ba, 8Ca, 8Aa. In the state guided by 8Bb, 8Cb, and 8Ab, it reaches the rear part of the cab 1 and is connected to a winding device 14 disposed in the rear part of the ceiling. A take-up spring (not shown) that is constantly biased toward the take-up side is provided. The urging force of the winding spring acts on the front window 3 via the assist cable 12 so that the labor required when the operator opens and closes the front window 3 can be reduced.

  In this embodiment configured as described, the cab 1 of the work vehicle has a closed position for closing the window opening 2a on the cab front surface 2 and an open position for opening the window opening 2a housed in the cab ceiling. And a pair of left and right guide rails 8 that guide the opening and closing of the front window 3 are arranged so as to extend in the front-rear direction along the cab ceiling surface 9. The upper guide rail portion 8A having a roller guide groove 8Aa for movably guiding the upper roller 4 attached to the upper portion of the upper portion 3, and the lower portion of the front window 3 are arranged so as to extend vertically along the cab front surface 2. A front guide rail portion 8B having a roller guide groove 8Ba for movably guiding the lower roller 5 attached to the upper guide rail portion 8B. In this structure, the upper guide rail portion 8A is closed. end Is provided with a deceleration inclined portion 8AaX that is inclined so that the groove bottom surface of the roller guide groove 8Aa becomes higher toward the closed position side, and the lower roller 5 is moved to the front guide rail when the front window 3 is closed. The upper roller 4 moves up the decelerating inclined portion 8AaX toward the closed position before the end of the portion 8B reaches the closed position side end, so that the closing speed of the front window 3 is reduced.

  Thus, before the lower roller 5 reaches the closed end, the upper roller 4 moves up the deceleration inclined portion 8AaX toward the closed position, so that the closing speed of the front window 3 is reduced. As a result, when the front window 3 is closed, the impact acting on the upper and lower portions of the front window 3 can be reduced. It is possible to avoid a problem such as damage.

  In addition, in this case, when the front window 3 is opened, the upper roller 4 moves downward toward the open position side of the deceleration inclined portion 8AaX, so that the deceleration inclined portion 8AaX opens the front window 3. Therefore, even if the deceleration inclined portion 8AaX is provided to decelerate the closing speed of the front window 3, the deceleration inclined portion 8AaX becomes a resistance when the front window 3 is opened. Can be avoided reliably.

  Further, the deceleration inclined portion 8AaX is formed in an arc shape centering on the lower roller 5 when the upper roller 4 is located at the open position side end of the deceleration inclined portion 8AaX, and then the upper roller 4 decelerates. The operating force when moving up the inclined portion 8AaX can be reduced.

  Further, in this structure, the upper guide rail portion 8A is provided with an extension portion 8AaY extending linearly toward the cab front surface 2 at the closed position side end portion on the closed position side with respect to the deceleration inclined portion 8AaX. Then, the upper roller 4 is guided toward the front surface 2 of the cab by the extension 8AaY at the end portion on the closed position side, so that the front window 3 is attached to the peripheral portion of the window opening 2a for preventing rainwater intrusion. Therefore, the sealing property between the front window 3 and the sealing member 10 can be reliably ensured. Further, the upper roller 4 is guided toward the front surface 2 of the cab by the extension 8AaY at the end portion on the closed position side, so that the front window 3 is also pressed against the lower window 11 disposed on the lower side of the front window 3. As a result, the sealing member between the front window 3 and the lower window 11 can be compressed without any deviation, and the sealing performance between the front window 3 and the lower window 11 can be reliably ensured. .

  Of course, the present invention is not limited to the above-described embodiment, and in the above-described embodiment, the speed-decreasing inclined portion 8AaX is formed in an arc shape. It can also be formed in a straight line inclined so that the bottom surface becomes higher as the closed position side.

  INDUSTRIAL APPLICABILITY The present invention can be used when a front window that can be opened and closed is provided in a cab in a working machine such as a hydraulic excavator.

DESCRIPTION OF SYMBOLS 1 Cab 3 Front window 4 Upper roller 5 Lower roller 8 Guide rail 8A Upper guide rail part 8Aa Roller guide groove 8AaX Deceleration part 8AaY Extension part 8B Front guide rail part 8Ba Roller guide groove

Claims (3)

  In a working vehicle provided with a front window that can be opened and closed at a closed position for closing a window opening on the front of the cab and an open position stored in the ceiling of the cab and opening the window opening, the opening and closing of the front window An upper guide having a pair of left and right guide rails that extend in the front-rear direction along the cab ceiling surface and having a roller guide groove that guides the upper roller attached to the upper portion of the front window in a movable manner A rail portion, and a front guide rail portion that is arranged so as to extend vertically along the front surface of the cab and has a roller guide groove that movably guides a lower roller attached to a lower portion of the front window. In forming, the lower guide roller is provided with a speed-reduction inclined portion that is inclined so that the groove bottom surface becomes higher toward the closed position side of the roller guide groove of the upper guide rail portion, and the lower roller serves as the front guide rail portion. Closed position The guide rail structure of the front window, wherein the upper roller is configured to decelerate the closing speed of the front window by moving the upper slope upward toward the closed position before reaching the end. .   The guide for a front window according to claim 1, wherein the deceleration inclined portion is formed in an arc shape centering on the lower roller when the upper roller is located at the open position side end of the deceleration inclined portion. Rail structure.   3. The front window according to claim 1, wherein the upper guide rail portion includes an extension portion that extends linearly toward the front surface of the cab at a closed position side end portion closer to the closed position side than the deceleration slope portion. Guide rail structure.

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