JP2606721Y2 - Power windows of construction machinery - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window mounted on a cab for a cab of a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art FIG. 8 is a side view showing a conventional power window mounted on a cab 1 of a hydraulic excavator (not shown). FIG. 9 is a diagram viewed from AA in FIG. In the prior art, as shown in FIGS. 8 and 9, a front window 2 is provided on the front surface of a cab 1, and left and right roller guide rails 3 are disposed parallel to the inner wall surface of the cab 1. The front window 2 having rollers 4 guided at four corners along the front window is slidably mounted. A deceleration motor 5 with a brake is arranged at the rear of the cab 1, a hoisting shaft 6 is connected to the deceleration motor 5 with a brake, and a hoisting drum 7 is pivotally mounted on the hoisting shaft 6. The cable connecting hardware 8 is fixedly provided at the upper left and right ends of the cable 9, and the cable 9 connected to the cable connecting hardware 8 is wound up or down on the hoisting drum 7. The front window 2 is moved between the closed position on the front surface of the cab (1) and the storage position on the inner surface side of the cab (1) by opening and closing the cab (1) by opening and closing the cab (1) by driving the deceleration motor 5 with brake. Can be done. Although not shown, a power window in which a lock motor with a deceleration structure is attached to the front window is considered in order to lock (meaning fixed) the opened and closed front window with respect to the cab.

[0003]

In a power window equipped with a lock motor in a front window, an accident such as disconnection of a winding of a motor portion of the lock motor or breakage of an internal gear of a speed reduction structure occurs. In that case, if the above-mentioned accident occurs when the lock motor is in the locked state, the front window cannot be moved, which is very confusing. In view of such circumstances, an object of the present invention is to provide a power window of a construction machine which can manually unlock a front window when a lock motor is in a locked state.

[0004]

The left and right roller guide rails are arranged in parallel with the inner wall surface of the front surface of the cab, and rollers are attached to four corners of a front window, and the rollers are guided along the roller guide rails. By this, in the power window of the construction machine to move the front window between the closed position of the front of the cab and the storage position of the ceiling of the cab to open and close, a lock motor is fixed to the front window, The lock motor has a motor unit, a clutch plate, and a drive shaft, and the rotation of the motor unit can be transmitted to the drive shaft via the clutch plate. A lock mechanism for pressing and locking the front window against the cab is connected. The lock mechanism separates the motor unit and the drive shaft by a clutch plate, and releases the locked state of the front window manually. Possible and the. Still further, the lock mechanism may include an output plate fixed to the drive shaft, a tip end portion of the output plate rotatably supported by the front window, and the other end portion located at a position eccentric to the drive shaft of the output plate. An L-shaped link rotatably supported, and furthermore, the upper roller is pivotally supported by a bending portion, wherein the L-shaped link is freely bent at the bending portion, and the output plate includes A hook projection for operation was formed.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing a power window equipped with the lock motor of the present invention. In the figure, 1
0 is a cab, 11 is a front window, 12 is a windshield of the front window 11, 13 is upper right and left rollers among rollers provided at four corners of the front window 11, 13 'is lower left and right rollers, 14
Is a lock motor, 15 is an L-shaped link (this L-shaped link 1
The refraction angle of 5 is not fixed but can be refracted freely) 16 is a roller guide rail disposed on the left and right inner wall surfaces of the cab 10, 17 is a cable guide rail, 18 is a cable, 1
9 is a drive motor for winding and rewinding the cable 18;
Reference numeral 0 denotes an elastic member such as a rubber material fixedly disposed on the inner surface side of the cab ceiling. FIG. 2 is a cross-sectional view of a main part taken along line BB of FIG. As shown in FIG. 2, it is configured substantially symmetrically to the left and right. FIG. 3 is a partially cutaway front view of the lock motor 14 of the present invention. In the figure, 21 is a lock motor 1
Reference numeral 4 denotes a motor unit, 22 denotes a harness connected to the winding inside the motor unit (21), 23 denotes a reduction structure, 24 denotes a casing of the reduction structure 23, G denotes a gear, 25 denotes a drive shaft,
Reference numeral 7 denotes a clutch plate interposed between the gear G and the end face of the drive shaft 25 for transmitting power by frictional force. Reference numeral 28 denotes a bearing;
Is an output plate fixedly crimped to the end of the drive shaft 25;
0 is a crimp pin that fixes the L-shaped link 15 to the output plate 29, and R is the axis of the drive shaft 25 (O-
This is the amount of eccentricity of the crimping pin 30 with respect to O). FIG. 4 shows FIG.
FIG. 5 is a side view showing a state in which the lock motor 14 is operated to lock, as viewed from the CC direction of FIG. In the figure, reference numeral 31 denotes a hook projecting portion formed on the output plate 29. It should be noted that the front window 11 is hatched for easy identification. FIG. 5 is a detailed view of a main part of a D part in FIG. In the case of the present embodiment, the L-shaped link 15 and the output plate 29 constitute a lock mechanism for pressing the front window 11 against the cab to lock it.

Next, the structure of the lock motor 14 of the present invention will be described with reference to FIGS. In the present invention, the rotation of the speed reduction structure portion 23 of the lock motor 14 is transmitted to the drive shaft 25 via the clutch plate 27, and the output plate 29 is fixedly attached to the end of the drive shaft 25, and A hooking projection 31 (shown in FIGS. 4 and 5) is formed at one end of the output plate 29, and when the lock motor 14 is not rotating, the hooking projection 31 is manually operated. 29 is configured to be capable of rotating adjustment.

Next, the operation of the lock motor 14 of the present invention will be described. FIG. 5 is a side view of the main part when the lock motor 14 is in the locked state. In the figure, the drive shaft 2 of the lock motor 14 fixedly mounted on the upper part of the inner surface of the front window 11 is shown.
The distance K from the axis (OO) of No. 5 to the upper front surface A of the front window 11 is constant. The upper roller 13 is fitted on a roller guide rail 16, and the upper roller 13 is pivotally supported by a bending portion of the L-shaped link 15. The base end of the L-shaped link 15 is fixed to the output plate 29 by a crimping pin 30, and the distal end of the L-shaped link 15 is rotatably supported by a pin 32 on the side surface of the front window 11. ing. When the lock motor 14 is in the locked state, the distance L1 from the axis (P-P) of the crimping pin 30 to the front surface of the front window 11 is longer than the distance K, and the movement in the cab chamber direction is restricted. Upper roller 13 and drive shaft 25
, The front window 11 on which the lock motor 14 is fixed is pushed out toward the inner wall surface of the cab 10, and the upper front side of the front window 11 is The front window 11 is locked and fixed by being pressed against an elastic member 20 disposed on the inner surface side of the ceiling of the ceiling 10. To release the lock from this state, the axis (OO) of the drive shaft 25 of the lock motor 14 is moved in the direction of arrow B in FIG.
Is rotated. As a result, the output plate 29 rotates in the direction of arrow B, so that the axis (PP) of the crimping pin 30 is formed.
Rotates around a locus of radius R about the axis (OO) of the drive shaft 25, and the axis (PP) of the crimping pin 30 moves in a direction approaching the front window 11. . Crimp pin 30
The relative distance between the shaft center (PP) and the upper roller 13 is kept constant by the L-shaped link 15, so that the lock motor 1
Reference numeral 4 indicates that the lock motor 14 and the front window 11 are pushed out toward the interior of the cab with the movement of the axis (PP) of the crimping pin 30, and the locked state of the front window 11 is released. That is, the distance from the axis (PP) of the crimping pin 30 to the front surface of the front window 11 is smaller than the distance K from the axis (OO) of the drive shaft 25 to the front surface of the front window 11. Therefore, a space is generated between the elastic member 20 and the upper front surface A of the front window 11.

If the lock motor 14 fails while the front window 11 is locked and locked as described above, the lock motor 14 does not operate, so that the front window 11 cannot be unlocked. In this case, when the user wants to move the front window 11 by hand to open and close, the connection (not shown) between the front window 11 and the cable 18 is removed, and the hooking protrusion 31 shown in FIG. Manually rotate in the direction of arrow B by using, for example. The turning operation of the hooking projection 31 is manually performed against the frictional force of the clutch plate 27 (shown in FIG. 3) and the drive shaft 25 in contact with each other. FIG. 6 is a side view of a main part showing a state where the lock motor 14 is unlocked. FIG. 7 is a detailed view of a main part of a portion E in FIG. As shown in FIG.
Is rotated in the direction of arrow B to lock at the C position angle. With the rotation adjustment of the output plate 29, the axis (PP) of the crimping pin (30) is shifted to the axis of the drive shaft (OO).
Rotate around a locus of radius R centered at. Since the distance L2 from the axis (PP) of the crimping pin (30) to the front of the front window 11 is smaller than the distance K from the axis of the drive shaft (OO) to the front of the front window 11, , An interval l is generated between the elastic member 20 and the upper front surface a of the front window 11. That is, since the locked state of the front window 11 is released, the rollers at the four corners of the front window 11 (the upper roller 13 and the lower roller 13 ′) are moved along the roller guide rail 16 so that the front window 11 is manually opened and closed. Can be moved.

[0009]

According to the present invention, the rotation of the motor section of the lock motor can be transmitted to the drive shaft via the clutch plate, and the lock mechanism is manually operated in a state where the front window is locked. Because the drive shaft and the motor part were separated by the clutch plate and the front window could be unlocked, accidents such as disconnection of the motor winding of the lock motor and breakage of the internal gear of the deceleration structure occurred in the locked state. In such a case, the lock of the lock motor can be released. Thereby, safety and maintainability of the power window of the construction machine can be improved.

According to the second aspect of the present invention, the locking mechanism has an L-shaped link whose tip end is rotatably supported by the front window and whose bent portion is supported by the cab. The output end plate has a base end portion rotatably supported at an eccentric position and an output plate connected to a drive shaft. The output plate is formed with a hooking projection for manual operation. Therefore, not only can the driving force of the lock motor be smoothly transmitted to the front window, but also the lock of the front window can be released by a simple operation even in the locked state.

[Brief description of the drawings]

FIG. 1 is a side view showing a power window equipped with a lock motor of the present invention.

FIG. 2 is a cross-sectional view of a main part taken along line BB in FIG.

FIG. 3 is a partially cutaway front view of the lock motor of the present invention.

FIG. 4 is a side view showing a state where the lock motor is operated to lock, as viewed from the direction of arrows CC in FIG. 2;

FIG. 5 is a detailed view of a main part of a part D in FIG. 4;

FIG. 6 is a main part side view showing a state where a lock motor is unlocked.

FIG. 7 is a detailed view of a main part of a portion E in FIG. 6;

FIG. 8 is a side view showing a conventional power window.

9 is a diagram viewed from AA in FIG. 8;

[Description of Signs] 1,10 Cab 2,11 Front window 3,16 Roller guide rail 9,18 Cable 13 Upper roller 14 Lock motor 15 L-shaped link 20 Elastic member 23 Reduction mechanism 25 Drive shaft 27 Clutch plate 29 For output Plate 31

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 7/108 B60J 1/00 B60J 1/17

Claims (2)

(57) [Scope of request for utility model registration] 1. A left and right roller guide rail is provided parallel to an inner wall surface of a front surface of a cab, rollers are attached to four corners of a front window, and the rollers are guided along the roller guide rails. In a power window of a construction machine in which a window is moved between a closed position on a front surface of a cab and a storage position on a ceiling of a cab to open and close, a lock motor is fixed to the front window, and the lock motor is A motor unit, a clutch plate, and a drive shaft, and the rotation of the motor unit can be transmitted to the drive shaft via the clutch plate. A lock mechanism for pressing and locking the front window against the inner wall surface of the cab is connected, and the lock mechanism separates the drive shaft and the motor unit by the clutch plate and performs manual operation. In the power window of the construction machine, characterized in that it was possible to unlock state of the front window. 2. An output plate fixed to the drive shaft, wherein the lock mechanism has a tip end rotatably supported by the front window, and the other end is eccentric from the drive shaft of the output plate. An L-shaped link pivotally supported at a position, and furthermore, the upper roller is pivotally supported at a bending portion, wherein the L-shaped link is freely bent at the bending portion; The power window of a construction machine according to claim 1, wherein a hooking protrusion for the manual operation is formed.