JP4160832B2 - Construction machine wiper equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiper device for a construction machine that wipes a front window of a cab in a construction machine such as an excavator or a crane.
[0002]
[Prior art]
In construction machines such as excavators and cranes, a wiper device is attached in front of the cab in order to wipe off dust such as rain water and earth and sand adhering to the front window of the cab. Such a wiper device is also attached to a general vehicle such as a passenger car. However, the general vehicle is provided only for securing a forward view during traveling. On the other hand, in construction machinery, the operator can clearly see the status of construction work by the front (construction machine) such as excavation work by excavator, construction dismantling work, and lifting and lowering work by crane. Since the wiper device is provided mainly for the purpose, the performance required for the wiper device is naturally different from that of a general vehicle. The present invention seeks to improve such a wiper device for a construction machine so as to facilitate construction work by a front.
[0003]
Therefore, in order to facilitate understanding of the features of the present invention, which will be described in detail later, a conventional technique related to a wiper device for a construction machine will be described with reference to FIG. FIG. 2 is a front view of a front window of a cab in a hydraulic excavator provided with a conventional wiper device. In FIG. 2, a state where the wiper blade 1 and the wiper arm 2 are located at the oscillation start point and a state when the wiper is located at the oscillation end point are simultaneously illustrated.
[0004]
As a reminder, the state seen from FIG. 2 shows the front window of the cab of the hydraulic excavator, and the front window has a rectangular shape that is long in the vertical direction as shown in the figure. This point is different from the front window of a general vehicle. FIG. 2 is a view of the front window of the driver's cab as seen from the front of the outdoor side, so that the wiper device appears to be attached to the right side of the front window. The left side is swingably attached. Although not shown, the front of a hydraulic excavator provided with a boom, an arm, a bucket and the like is installed on the right side when viewed from the cab. Hereinafter, left and right refer to directions when viewed from the cab.
[0005]
2, a wiper blade 1 is attached to the wiper arm 2 and wipes the window glass 11 of the front window 10 of the cab by swinging the wiper arm 2, and 2 is pivotally attached to the front side of the front window 10 so as to be swingable. Re drive movement is the wiper arm, 3 wiper motor as a power source for driving so as to swing the wiper arm 2, 4 is the rotation of the wiper arm which is pivotally attached to the wiper arm 2 to swing if ability A shaft 10 is a rectangular front window that is long in the vertical direction and forms a window in front of the cab, 11 is a window glass of the front window 10, and 12 is a window frame of the front window 10.
[0006]
The wiper blade 1 is replaceably attached to the wiper arm 2 so that the wiper blade 1 can be removed, for example, by being pulled out. A motor mounting portion 12a is formed on the window frame 12 of the front window 10, and the wiper arm 2 and the wiper motor 3 are mounted on the motor mounting portion 12a. The wiper motor 3 is driven to swing the wiper arm 2 about the rotation shaft 4 by converting the rotational motion into a swing motion by a mechanism (not shown).
[0007]
When the construction machine is an excavator as in the example of FIG. 2, the cab is moved to the left side of the swivel frame and the front is installed on the right side of the cab, so that the wiper arm 2 and the wiper motor 3 have the right field of view. Is attached to the left side of the window frame 12. Incidentally, when the construction machine is a crane, the cab is moved to the right side and the front is installed on the left side of the cab, so that the wiper arm 2 and the wiper motor 3 do not impair the left field of view. It is attached to the right side of the window frame 12. In general wiper equipment, passenger vehicles and other general vehicles need the best visibility at the center of the front window to ensure forward visibility during travel. In order to be able to confirm, it is the most important matter to improve the visibility on the left and right sides of the front window 10 as described above, and this point is greatly different from that of a general vehicle.
[0008]
Since the conventional wiper device of a construction machine has such a structure, when the wiper motor 3 is driven, the wiper arm 2 swings and wipes the window glass 11 of the front window 10 by the wiper blade 1. In that case, the wiper blade 1 moves so as to draw an arc as the wiper arm 2 swings, and wipes the window glass 11 in the region between the upper and lower arc-shaped chain lines S ₁ and S ₂ shown in FIG. . Thus, in the wiper device is conventional construction machine, it is impossible to wipe the window glass 11 for arcuate outer region of the chain line S ₁ in the upper in Fig. A wiper device for this type of construction machine is disclosed in Patent Document 1, for example.
[0009]
[Patent Document 1]
Japanese Utility Model Publication No. 7-55170 (page 1-3, Fig. 1-6)
[0010]
[Problems to be solved by the invention]
By the way, in construction machines such as excavators and cranes, work is performed by the front at both the upper and lower positions, so that the work status by the front at both positions can be visually observed through the front window of the driver's seat. It is necessary to do so. For example, in an excavator, a bucket and other parts are dismantled and excavated by a bucket at an upper position and a lower position on the right side of the operator's cab. It is necessary to make it visible through the right side of the front window. In addition, since the crane performs the lifting and unloading work on the left side of the cab, it is necessary to make it possible to visually check the transfer status of the suspended load above and below through the left side of the front window. It is.
[0011]
For this reason, in construction machines such as excavators and cranes, the front window is formed in a rectangular shape that is long vertically. By the way, in the standard type hydraulic excavator, the front face of the cab is formed around 1 m in length and around 1 m 70 cm in width, and the front window occupies most of the front face of the cab. Since the front window is formed in a rectangular shape in this way, in the conventional wiper device of a construction machine, as shown in FIG. 2, the area that cannot be wiped by the wiper blade is on the left or right side of the front window (FIG. 2). In the example of a hydraulic excavator, it occurs over a considerable range, particularly above the right side of the front window 10).
[0012]
Therefore, when rainwater or dust adheres to the upper part of the front window, the upper field of view will be narrower than usual, so when the construction machine is a hydraulic excavator, for example, the operator I have to take a posture that looks into the upper right diagonally from the bottom, and I am extremely tired. In order to avoid this, if the wiper arm or wiper motor mounting position is set to the opposite side and the upper wiping area on the left or right side of the front window is widened, the lower field of view will now have a lower field of view. It will always be damaged by the motor and these mounting means.
[0013]
The present invention was created in order to solve such problems of the prior art, and the technical problem is that the wiping area above the front window without impairing the lower visibility on either the left or right side of the front window. An object of the present invention is to provide a wiper device for a construction machine that can be expanded more than before.
[0014]
[Means for Solving the Problems]
In order to achieve these technical problems, the present invention
A wiper arm which is driven so as to be swingable journalled in wiper system for a construction machine that includes a wiper blade for wiping a windshield of a cab of a construction machine by swinging the mounted wiper arm to the wiper arm ,
A wiper arm which is driven so as to be swingable journalled in wiper system for a construction machine that includes a wiper blade for wiping a windshield of a cab of a construction machine by swinging the mounted wiper arm to the wiper arm ,
An auxiliary wiper blade for wiping a windshield of the cab together with the wiper blade,
With connecting the auxiliary wiper blade and the wiper blade so as to be parallel to each other, the tip and the wiper of the auxiliary wiper blade lying on when the wiper blade is in position and the position of the pivot end point of the swing start When the wiper blade swings from the position of the swing start point to the position of the swing end point and swings from the position of the swing end point to the position of the swing start point. A plurality of the wiper blades that have been erected and fall in the opposite direction from the position of the swing start point or the swing end point, and the auxiliary wiper blade is moved in parallel so as to protrude upward with respect to the wiper blade. And the link
One end of which is rotatably journalled in a position eccentric with respect to rotation axis of the wiper arm, and the other end is pivotally attached rotatably to one of said plurality of links, of the wiper arm A link tilting arm that tilts the one link to rise or fall when swinging;
In the course of swinging between a position of the swinging end point of the wiper blade is swung start the oscillation of the wiper arm, so that the link tilt arms from falling to the one link in the opposite direction By tilting, the auxiliary wiper blade protrudes upward from the wiper blade and wipes the upper side of the front window.
[0015]
In the wiper device for a construction machine according to the present invention configured as described above, when the wiper arm is driven to swing, the plurality of links connecting the auxiliary wiper blade and the wiper blade are also displaced accordingly . Link tilting arm, at the other end side are pivotally rotatably to one of the plurality of links pivotally axial attachment at a position eccentric against the rotation axis of the wiper arm at one end because it is, as the wiper blade from the oscillating wiper arm is in the process of swinging between a position of the swinging end point of the swing start, or debt is or Ki gradually cause the one link Tilt. During this time, the other links are tilted so as to get up and down in conjunction with the tilt of one link . Auxiliary wiper blade, the link when the tilting arm is tilted so as to fall the one link in the reverse direction, protrudes while being held in a parallel orientation by a plurality of links to the wiper blade wiper blade upper side than (outside) Then, the area of the front window above the area wiped by the wiper blade is wiped.
[0016]
In that case, the wiper blade wipes the area of the front window inside the area wiped by the auxiliary wiper blade, and the wiper blade wipes the area of the front window between the outside and inside twice by the wiper blade. To do. As described above, in the wiper device for a construction machine according to the present invention, each area of the front window is wiped in cooperation while the wiper blade and the auxiliary wiper blade complement each other. The wiping area above the front window can be expanded more than before without impairing the field of view below (for example, on the right side of the front window for excavators and on the left side of the front window for cranes).
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be clarified by describing a concrete example showing how the present invention is actually embodied based on FIG. FIG. 1 is a front view of a front window of a driver's cab in a hydraulic excavator provided with a wiper device for a construction machine according to an embodiment of the present invention. 1, the same reference numerals as those in FIG. 2 denote the same parts as those in FIG. FIG. 1 simultaneously shows a state where one wiper including the wiper blade 1, the auxiliary wiper blade 1a, the wiper arm 2 and the like is swinging to each position.
[0018]
The wiper device of the construction machine of FIG. 1 is mounted on a pivot shaft 4 so as to be swingable, and is driven to swing by a wiper motor 3 in the same manner as the conventional wiper device of FIG. The wiper arm 2 is attached to the wiper arm 2 in a replaceable manner, and includes a wiper blade 1 that wipes the front window 10 of the cab by swinging the wiper arm 2. The wiper arm 2 and the wiper motor 3 are attached to a motor attachment portion 12a formed on the left side of the window frame 12 so as not to impair the right field of view. The basic structure is the same as that of a conventional wiper device. Absent.
[0019]
The greatest feature of the wiper device of the construction machine in FIG. 1 is that, in the wiper device of the construction machine having such a structure, the auxiliary wiper blade 1a for wiping the cab front window 10 together with the wiper blade 1, and the auxiliary wiper blade A pair of blade links 5a and 5b for connecting 1a and the wiper blade 1 and one end side forming a base portion are eccentrically pivoted with respect to the wiper arm 2, and the other end side is paired with a pair of blade links 5a, A link tilting arm 6 that pivotally attaches to the inner blade link 5b of 5b and tilts the blade link 5b with respect to the wiper blade 1 when the wiper arm 2 swings is provided to swing the wiper arm 2. In the process of moving, the auxiliary wiper blade 1a wipes the upper side of the front window 10 from the wiper blade 1. It lies in that is configured to.
[0020]
More specifically, the structure is the same as that of the wiper blade 1 as the auxiliary wiper blade 1a. The pair of blade links 5a and 5b are of the same standard having the same length and the same pin hole position, and the wiper blade 1 and the auxiliary wiper blade 1a are pivotable with pins so as to be parallel to each other. By attaching, the auxiliary wiper blade 1a is connected to the wiper blade 1 so that it can be translated. In order to attach the base portion of the link tilting arm 6, a bracket 8 is erected in the vicinity of the motor attachment portion 12 a outside the window frame 12. In the example shown here, a pair of blade links are provided, but a larger number of blade links may be provided, and the link tilting arm 6 may be pivotally attached to one of these blade links.
[0021]
The link tilting arm 6 is pivotally attached to the bracket 8 at the base by an arm turning shaft 7a and pivoted at the center of the inner blade link 5b by an arm turning shaft 7b. is doing. Arm rotation shaft 7a to pivotally this link tilting arm 6 to the bracket 8 are disposed eccentrically diagonally upward at a distance L with respect to the pivot shaft 4. Auxiliary wiper blade 1a is in the position of the position and the swinging end point P ₅ of the swing start point P _1, the blade link 5a, and overlap the wiper blade 1 5b is falling, so that the tip portions are substantially aligned .
[0022]
As will be described later, the auxiliary wiper blade 1a projects upward (outside) from the wiper blade 1 by tilting the blade link 5b with the link tilting arm 6 when the wiper arm 2 swings. the protrusion amount M to the upper side of the auxiliary wiper blade 1a of, when the link tilting arm 6, which is located on the line connecting the centers of the arm rotation shaft 7a of the rotating shaft 4, i.e. the position of the P ₃ when in the blade link 5a, 5b is the maximum fall down in a direction opposite to the case in the position of the swing start point P _1, the projecting amount M is between the center of rotation shaft 4 and the arm rotation shaft 7a Is substantially equal to the distance L. Therefore, it is possible by selecting the distance L and the position of the arm rotation shaft 7a against rotation shaft 4, appropriately adjusting the maximum projection amount and the maximum protruding position of the auxiliary wiper blade 1a for the wiper blade 1.
[0023]
In the wiper device for a construction machine having such a structure, when the wiper motor 3 is driven to swing the wiper arm 2, the pair of blade links 5a that connect the wiper blade 1 and the auxiliary wiper blade 1a. , 5b are displaced as if swiveling with the wiper arm 2. During this time, the wiper blade 1 wipes the front window 10 in the region between the chain line S ₁ and the chain line S ₂ in FIG. On the other hand, the link tilting arm 6 whose tip is pivotally attached to the inner blade link 5b with the arm pivot shaft 7b is pivotally attached to the wiper arm 2 with the arm pivot shaft 7a being eccentric. Therefore, in the process in which the wiper blade 1 swings and the inner blade link 5b is displaced, the blade link 5b is tilted so as to gradually rise and fall.
[0024]
That is, as shown in FIG. 1, the link tilting arm 6 erects the inner blade link 5b that has fallen at the position of the swing start point P ₁ when the wiper blade 1 swings to the position of P ₂ . . Next, when the wiper blade 1 swings to the position of P ₃ near the diagonal of the front window 10, the blade link 5 b is tilted in the direction opposite to that at the position of the swing start point P _1. when pivoted to a position of the ₄ blades link 5b is erected, the defeat blade link 5b when it reaches the position of the swing end point P _5. During this time, the outer blade link 5a tilts so as to follow or fall over the inner blade link 5b.
[0025]
Then, along with the tilting movement of the blade links 5a and 5b, the auxiliary wiper blade 1a is supported more stably by the blade links 5a and 5b than the wiper blade 1 while being supported in a stable state so as to maintain a parallel posture with respect to the wiper blade 1. Projecting upward, the front window 10 is wiped in a region between the chain line T ₁ and the chain line T ₂ in FIG. That is, the auxiliary wiper blade 1a is expanded over the wiping range of the front window 10 protrudes allowed formed upper side of the wiper blade 1 in the vicinity of the position of the left side above the P ₂ as viewed from the cab, the front window 10 The wiping range above the front window 10 is further expanded by projecting as much as possible near the position of P ₃ near the upper right corner. Then, the auxiliary wiper blade 1a is to halve the amount of projection in the vicinity of the position of the right P ₄ of narrow width windshield 10, the windshield close to the alumni frame 12 while preventing contact with the right vertical window frame 12 Wipe 10 out. And when it reaches the position of the swing end point P ₅ , it does not protrude with respect to the wiper blade 1, but since it has protruded until then, the wiping area below the front window 10 can be enlarged as compared with the conventional case. At any position in the area, the wiping area is not reduced at least as compared with the prior art.
[0026]
As a result, the auxiliary wiper blade 1a is configured to wipe the area outside of the front window 10 than the wiping region by the wiper blade 1 (the region between the chain line S ₁ and the chain line T ₁₎ at the projecting portion, with the other part by wiping an area that overlaps the wiping region by the wiper blade 1 (the region between the chain line S ₁ and the chain line T _2), wiping double the same region of two wiper blades 1, 1a. Further, the wiper blade 1 wipes the region of the front window 10 (the region between the chain line T ₂ and the chain line S ₂ ) inside the wiping region by the auxiliary wiper blade 1 a.
[0027]
Thus, in this construction machine wiper device, each region of the front window 10 is wiped in cooperation with the wiper blade 1 and the auxiliary wiper blade 1a while complementing each other. The wiping area above the front window 10 can be expanded without impairing the lower field of view on the side (for example, the right side of the front window 10 for excavators and the left side of the front window 10 for cranes). As a result, the operator can operate the front without taking an unreasonable posture.
[0028]
The central portion of the front window 10 (the portion between the chain line S ₁ and the chain line T ₂ ) is particularly dirty and has a large area. However, in the wiper device of this construction machine, the central portion is separated by the wiper blade 1 and the auxiliary wiper blade 1a. Since the wiping is performed twice, the wiping of the front window 10 can be performed rationally. Further, since the auxiliary wiper blade 1a wipes the front window 10 while being supported by the pair of blade links 5a and 5b, the front window 10 can be wiped in a stable state.
[0029]
Such an effect is that the base side is eccentric with respect to the wiper arm 2 so as to be pivotable, and the tip end side is pivotally attached to one of the plurality of blade links 5a, 5b. that blade link 5a during the swing, 5b one link tilting arm 6 to tilt provided for, suitably the distance L between the eccentric position and both axes 4,7a of the arm rotation shaft 7a against rotation shaft 4 If set, it is possible to demonstrate. In the example of FIG. 1, a line connecting the axial center of the rotating shaft 4 and the arm rotation shaft 7a, so as to incline slightly downward relative to the line segment connecting the upper right corner of the center and the front window 10 of the rotary shaft 4 a manner that is, the rotary shaft 4 and the arm rotating as well as to pay a line connecting the axial center of the rotating shaft 4 and the arm rotation shaft 7a an angular range of particularly about ± 20 ° relative to the line segment If the distance L between the shafts 7a is set appropriately, the maximum protruding position of the auxiliary wiper blade 1a can be determined in the vicinity of the upper right corner of the front window 10, and the right side of the front window 10 is not impaired in the lower visibility. The wiping area above the front window 10 can be greatly enlarged as compared with the conventional case. When it is desired to enlarge the wiping area on the left side of the front window 10, it can be similarly enlarged.
[0030]
The wiper device shown in FIG. 1 does not change the basic structure of the conventional wiper device, as apparent from the comparison with the conventional wiper device shown in FIG. 2, and the auxiliary wiper blade 1a and the related wiper device are related thereto. Since the blade links 5a and 5b, the link tilting arm 6 and the like are added, when manufacturing the wiper device shown in FIG. 1, the conventional wiper device manufacturing apparatus can be effectively used without being discarded. . In this wiper device, the auxiliary wiper blade 1a uses the same standard as that of the wiper blade 1, and the blade links 5a and 5b need only use the same standard. Can be manufactured efficiently.
[0031]
【The invention's effect】
As can be seen from the above description, the wiper device for a construction machine according to the present invention particularly includes: “an auxiliary wiper blade for wiping the front window of the cab together with the wiper blade, and the auxiliary wiper blade and the wiper blade in parallel to each other. with coupling so, is substantially aligned state and the tip of the tip and the wiper blade of the auxiliary wiper blade lying on when the wiper blade is in the position and the position of the pivot end point of the swing start, wiper blades swing The position where the wiper blade swings from the start position to the swing end position and from the swing end position to the swing start position and then the wiper blade rises to the swing start position or the swing end position. parallel transfer so as to protrude upward with respect to the wiper blade auxiliary wiper blade lying in a direction opposite to the case in A plurality of links which, one end of which is pivotally attached rotatably at a position eccentric with respect to rotation axis of the wiper arm, the other end is pivotally attached rotatably to one of a plurality of links, It provided a link tilting arm tilting to or falling or place one link during oscillation of the wiper arm, while the wiper blade from the oscillating wiper arm is the position of the swinging end point of the swing start In the process of swinging , the link tilting arm tilts one link so that it tilts in the opposite direction, so that the auxiliary wiper blade protrudes above the wiper blade and wipes the upper side of the front window. Therefore, the wiping area on the upper side of the front window can be enlarged without impairing the lower view on the left and right sides of the front window. As a result, the operator can operate the front without taking an unreasonable posture.
[0032]
In addition to the above basic effects, the wiper device for a construction machine according to the present invention wipes the central portion of the front window, which is particularly dirty and wide, with a wiper blade and an auxiliary wiper blade. Therefore, the front window can be wiped out reasonably. Further, since the auxiliary wiper blade wipes the front window while being supported by a plurality of links, the front window can be wiped in a stable state.
[Brief description of the drawings]
FIG. 1 is a front view of a front window of a cab in a hydraulic excavator provided with a wiper device for a construction machine according to an embodiment of the present invention.
FIG. 2 is a front view of a front window of a driver's cab in a hydraulic excavator provided with a conventional wiper device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wiper blade 1a Auxiliary wiper blade 2 Wiper arm 3 Wiper motor 4 Wiper arm rotating shaft 5a, 5b Blade link 6 Link tilting arm 7a, 7b Arm rotating shaft 8 Bracket 10 Front window 11 Window glass 12 Window frame 12a Motor Mounting portion L Distance M between the center of the rotating shaft 4 and the arm rotating shaft 7a A protruding amount of the auxiliary wiper blade 1a upward

Claims (1)

A wiper arm which is driven so as to be swingable journalled in wiper system for a construction machine that includes a wiper blade for wiping a windshield of a cab of a construction machine by swinging the mounted wiper arm to the wiper arm ,
An auxiliary wiper blade for wiping a windshield of the cab together with the wiper blade,
With connecting the auxiliary wiper blade and the wiper blade so as to be parallel to each other, the tip and the wiper of the auxiliary wiper blade lying on when the wiper blade is in position and the position of the pivot end point of the swing start When the wiper blade swings from the position of the swing start point to the position of the swing end point and swings from the position of the swing end point to the position of the swing start point. A plurality of the wiper blades that have been erected and fall in the opposite direction from the position of the swing start point or the swing end point, and the auxiliary wiper blade is moved in parallel so as to protrude upward with respect to the wiper blade. And the link
One end of which is rotatably journalled in a position eccentric with respect to rotation axis of the wiper arm, and the other end is pivotally attached rotatably to one of said plurality of links, of the wiper arm A link tilting arm that tilts the one link to rise or fall when swinging;
In the course of swinging between a position of the swinging end point of the wiper blade is swung start the oscillation of the wiper arm, so that the link tilt arms from falling to the one link in the opposite direction A wiper device for a construction machine , wherein the auxiliary wiper blade protrudes upward from the wiper blade and wipes the upper side of the front window by tilting .

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