JP2002307941A - Front window opening/closing device with assist function for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front window opening/closing device with assist function for a working vehicle applicable to a cabin having an angular part with a small radius of curvature. SOLUTION: In this front window opening/closing device with assist function for the working vehicle, cable lanes 21c, 22c, 23c for guiding an assist cable 27 are provided in the grooves of guide rails 20L, 20R for rolling to guide guide rollers 17, 18 fitted to the right, left and upper and lower sides of a front window 16. A pilot roller 33 is rotatably connected to the tip part of the assist cable 27 by a shaft 34. The shaft 34 of the pilot roller 33 and a shaft 36 of the guide roller 18 are connected by a link 35, and the pilot roller 33 and the guide roller 18 are rolled on the same guide rails 20L, 20R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front window opening and closing device with an assist function for a working vehicle.

[0002]

2. Description of the Related Art In a driver's cab of a working vehicle such as a hydraulic shovel or a crane truck, an operator's cab is provided so that an operator can easily check the working state and the like while looking down directly below the front of the working vehicle during work. In many cases, a device that allows the front window to be opened and closed (hereinafter, referred to as a front window opening device) by applying the glass window on the front of the vehicle to the lower position of the cab ceiling while sliding the glass window upward is applied. Conventionally, in a work vehicle to which this front window opening / closing device is applied, there is a work vehicle having a function of assisting a force required for operation when a heavy front window is slid upward, for example, by a winding reel applying spring force. A front window opening / closing device configured to apply a force against the mass of the front window to the front window or to pull up the front window with a motor driven winding reel (hereinafter, referred to as a front window opening / closing device with an assist function). It has been known.

[0003] For example, Japanese Patent Application Laid-Open No. 11-173001 discloses a front window opening / closing device having an assist function which is constituted by using the above-mentioned spring-type take-up reel.
An example of the prior art will be described with reference to FIG. FIG. 7 is a schematic perspective view of a driver's cab of a work vehicle according to the related art, and FIG. 8 is a side view of a rail portion of a front window opening / closing device with an assist function according to the related art.

In FIGS. 7 and 8, a driver's cab 1 is mounted above a vehicle body 3 of a work vehicle. Front wall 6 of cab 1
A curved surface 6 having a large radius of curvature between the roof 1 and the roof 62
The front wall 61 is formed with a substantially rectangular front window opening 60. Curved rails 70L and 70R are fixed in parallel along the left and right sides of the ceiling, which is the lower surface of the roof 62, from both left and right sides of the front window opening 60. Since the rails 70L and 70R are symmetrical, only the right rail 70R will be described below, and the description of the left rail 70L will be omitted.

The rail 70R is formed by bending an iron plate to form double rails 71 and 72 having a cross-sectional shape in which two substantially U-shaped grooves are arranged adjacent to each other in a substantially W shape.
Is formed so as to conform to. Of the double rails 71, 72, the outer rail 71 is used as a roller guide rail, and a glass 73a and a frame 73 are provided in the rail 71.
b, and guide rollers 74, 75 respectively disposed on the upper and lower sides of the left and right sides of the front window 73 having a shape substantially along the curved surface 63 are rotatably fitted to constitute an opening / closing device for the front window 73. are doing.

Further, a cable reel (hereinafter referred to as an assist reel) which is urged by a spring (not shown) to be wound on a rear end portion of the inner rail 72 as a cable guide rail. 76, an assist cable 77 pulled out from the cable reel 76 is laid along the rail 72, and the assist cable 77 is
Is connected to one end of a link 81 of a connecting device 80 by a pin 82, and the other end of the link 81 is connected to a rotation shaft 75 a of the guide roller 75.

In the configuration shown in FIGS.
Can be manually opened and closed in the vertical direction, and the weight of the front window 73 at the time of opening and closing is reduced by left and right assist reels 76, 76. Further, the link 81 of the connecting device 80 is made longer so that the link 8 with respect to the axis of the assist cable 77 is
As a result, the force of the guide roller 75 and the pin 82 pressed against the side walls of the guide rails 71 and 72 can be reduced by the tension of the assist cable 77, so that the front window 73 can be opened and closed smoothly. , The generation of abnormal noise can be prevented.

[0008]

However, in the prior art described in Japanese Patent Application Laid-Open No. H11-173001, the front wall 61 and the roof 62 of the cab 1 are connected by a curved surface 63 having a large radius of curvature. Need, so that
There remains a problem that the driver's cab 1 cannot be freely set to have a substantially rectangular parallelepiped shape, for example, and the problem will be described below with reference to FIGS. FIG. 9 is an explanatory diagram of the operation according to the above-mentioned conventional technology.

(1) In FIG. 8, rails 70R are rails 71 for roller guides and rails 7 for cable guides.
2 and the width in the adjacent direction is wide, so that it can be bent only with a large radius of curvature when bending in a plane including both rails 71 and 72, as is well known. As a result, as shown in FIG.
And the roof 62 must be connected by a curved surface 63 having a large radius of curvature, and the shape of the cab 1 cannot be freely set. Further, when the connection is made by the large curved surface 63, the operator bends forward in the cab 1 when the front window 73 is closed, and it is very difficult to look directly under the front of the work vehicle. Therefore, there are many opportunities to open the front window 73, and the burden on the operator increases when the weather is bad.

(2) In FIG. 9, if it is assumed that the rail 70R can be bent with a small radius of curvature, at a position where the rail 70R has a small bend (ie, a large radius of curvature) shown in FIG. , Assist cable 7
The link 81 needs a predetermined length because the lateral load F2, F1 acting on the guide roller 75 and the pin 82 needs to be reduced by the tension T of 7 to smooth the movement. In the position where the rail 70R has a large bend (that is, a large radius of curvature), the moving direction of the guide roller 75 and the link
Due to the large deviation from the pulling direction, the guide roller 75 and the pin 82 have large forces F4 and F3, respectively.
And is pressed against the side walls of the guide rails 71 and 72, and cannot move smoothly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a front window opening / closing apparatus with an assist function for a work vehicle which can be applied to a driver's cab having a corner having a small radius of curvature. And

[0012]

In order to achieve the above object, a first invention is to provide a pair of left and right guide rail grooves mounted along a front wall and a roof of a cab of a working vehicle. Inside, a front window opening / closing device with an assist function for a work vehicle that rolls guide rollers attached to the left, right, up and down of the front window and assists the opening operation of the front window with an assist device via an assist cable connected to the front window , A cable lane for guiding an assist cable is provided inside the groove of the guide rail.

According to the first invention, the following operations and effects can be obtained. (1) Since the cable lane for guiding the assist cable is provided in the groove of the guide rail, the guide roller and the assist cable of the front window are in the same guide rail. Therefore, even if the guide rail is bent with a small radius of curvature, The moving direction of the guide roller and the pulling direction of the assist cable always substantially match. (2) Since a guide rail dedicated to the assist cable is not required, the guide rail can be formed in a simple structure with a single cross section. Therefore, the weight and cost of the guide rail can be reduced, and the guide rail can be bent with a small radius of curvature. (3) As a result of the above (1) and (2), for example, the front wall and the roof of the cab can be connected by a curved surface having an arbitrary small radius of curvature, so that the cab having various shapes such as a substantially rectangular parallelepiped cab can be provided. Be universally applicable.

According to a second aspect of the present invention, in the first aspect, a pilot roller is rotatably connected to a distal end portion of the assist cable by a shaft, and a shaft of the pilot roller and a guide roller of the front window are connected by a link. The pilot roller and the guide roller are configured to roll on the same guide rail.

According to the second aspect, the following actions and effects are obtained in addition to the actions and effects of the first aspect. (1) Even if the guide rail is bent with a small radius of curvature, the tension of the assist cable is transmitted to the guide roller shaft via the pilot roller and the link. They can always be approximately matched. Similarly, the link is guided by the pilot roller, so that the link does not interfere with the guide rail. (2) Since the position of the pilot roller shaft is offset from the position of the guide roller and the shaft of the front window via the link via the link, the width of the connecting device can be shortened and the device can be made compact. Thereby, since the cross section of the guide rail can be reduced, the guide rail can be bent with a smaller radius of curvature.

In a third aspect based on the second aspect, the link is guided and rotated between an end surface of a flange provided on a shaft of the guide roller and a mounting surface of a frame of a front window for mounting the shaft. It is configured to be connected to.

According to the third aspect, the following actions and effects are obtained in addition to the actions and effects of the second aspect. (1) Since the link is guided between the flange end surface and the frame mounting surface, it does not tilt in directions other than around the guide roller axis. As a result, the link does not apply a thrust load to the guide roller on the guide roller shaft, so that the guide roller comes off and the occurrence of stiffness between the outer end of the guide roller and the inner wall surface of the guide rail groove is prevented. Can be prevented. (2) Since the link does not tilt in a direction other than around the axis of the guide roller, the assist cable can be located in the cable lane in the guide rail groove. Therefore, the guide cable does not hinder the rolling of the guide roller, and the guide cable can be prevented from falling off the guide rail. As a result, the reliability in the configuration in which the assist cable is housed inside the guide rail can be improved.

In a fourth aspect based on the second aspect, the link is fixed to an intermediate portion of the guide roller shaft in the axial direction, and the leg portion of the shaft opposite to the guide roller with the link interposed therebetween is moved forward. It is configured to be rotatably supported by a bearing portion having a predetermined axial length provided on a window frame.

According to the fourth aspect, the link is fixed to the guide roller, and the shaft of the guide roller is rotatably supported by the bearing having a predetermined axial length. It can be prevented from tilting in directions other than around the heart. Thereby, while being compact, the same operation and effect as the third invention can be obtained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to FIGS.

First, with reference to FIG. 1, the overall configuration of a front window opening / closing device with an assist function according to the present invention will be described. FIG.
1 is a side sectional view of a cab to which a front window opening / closing device with an assist function according to the present invention is applied. The same components as those in FIGS. 7 and 8 are denoted by the same reference numerals, and description thereof will not be repeated.

In FIG. 1, a pair of left and right guide rails 20L, symmetrically on left and right inner walls 2L, 2R, along the inside of a front wall 11, a roof 12, and a curved surface 13 connecting the both, of the cab 1. 20R is attached. Since the guide rails 20L and 20R are configured to be symmetrical to each other, only the right guide rail 20R shown in FIG. 1 will be described below, and the description of the left guide rail 20L will be omitted.

The guide rail 20R is formed by arranging a plurality of guide rails 21, 22, 23, 24 having different shapes so as to be connected in the longitudinal direction. Guide rail 2
In the groove of 0R, rotatable guide rollers 17, 18 respectively provided at upper and lower ends of left and right side surfaces of a front window 16 having a glass 16a and a frame 16b are fitted. It can be opened and closed manually up and down along 20R (, 20L). Note that FIG. 1 shows a state in which the front window 16 is being opened and closed for the sake of explanation.

In the vicinity of the rear end of the guide rail 21, an unillustrated steel band spring (so-called constant spring) having a coiled winding habit is used as an assisting device for the opening operation. Is provided, and the assist cable 27 pulled out from the assist reel 26 is laid along the groove of the guide rail 20R. The distal end of the assist cable 27 is connected to the vicinity of the lower guide roller 18 of the front window 16 via a connecting device 30. Thus, the assist reel 26 is configured to assist the opening operation (pull-up) of the front window 16 by the operator via the assist cable 27. The assist device is not limited to the spring-type assist reel as described above, and may be, for example, a power-driven assist reel driven by a motor in accordance with an operation signal of an operation switch (not shown).

Next, the structure of the guide rail 20R will be described in detail with reference to FIG. FIG. 2 is an explanatory view of the structure of the guide rail according to the present invention, and is a sectional view taken along line MM of FIG.

In FIG. 2, the groove 21 of the guide rail 21
a, a traveling lane 21b for rolling the guide rollers 17, 18 is formed inside the traveling lane 2a.
A cable lane 21c for running the assist cable 27 is formed along the running lane 21b between the groove 1b and the inner wall 21d of the groove 21a.

The grooves of the other guide rails 22 and 23 have the same sectional shape as the groove 21a of the guide rail 21. Similarly, the traveling lanes 22b and 23b and the cable lanes 22c and 23c (23b and 23c are FIG.
5 to FIG. 22b and 22c are not shown. ) Are formed respectively, but the description is omitted. Also, guide rail 2
In the groove 4, as shown in FIG. 1, since the length is short and only the guide roller 18 of the connecting device 30 enters, only the traveling lane 24 b (not shown) is formed and the formation of the cable lane is omitted. .

Next, the structure of the assist cable connecting device 30 will be described in detail with reference to FIGS. FIG. 3 is an explanatory view of an assist cable connecting device according to the present invention.
FIG. 4 is a cross-sectional view, and FIG. 4 is a cross-sectional view taken along line PP of FIG.

In FIGS. 3 and 4, the connecting device 30 attaches the eye joint 31 to the distal end of the assist cable 27 by crimping and / or brazing.
These are rotatably connected by a pilot roller shaft 34 with a spacer 32 interposed therebetween. A hole 35a at one end of the link 35 is fitted to a leg 34a of the pilot roller shaft 34 opposite to the eye joint 31, and the end of the leg 34a is
4b, it is fixed to the link 35. Link 35
A shaft 36 for rotatably supporting the guide roller 18 is rotatably inserted into a hole 35b at the other end of the shaft 36. The end of the shaft 36 opposite to the guide roller 18 is provided at the frame 16b of the front window 16.
To the bracket 37 with a nut 38. At this time, the end face of the flange 36a of the shaft 36 and the bracket 37
The link 35 is rotated only around the shaft 36 by sandwiching the link 35 with a small gap between the mounting surface 37a and the mounting surface 37a, so that no movement or inclination occurs in the plane including the shaft 36.

Next, another embodiment of the assist cable connecting device 30 will be described with reference to FIG. FIG. 5 is an explanatory view of an assist cable connecting device according to another embodiment. still,
The same components as those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 5, the hole 3 at the other end of the link 35
A shaft 36 for rotatably supporting the guide roller 18 is inserted through 5b, and a link 35 is fixed to a substantially central portion of the shaft 36 in the axial direction by press fitting, welding, brazing, or the like. Also, the shaft 36
Of the front window 16 from the link 35 of the front window 16
6 is rotatably inserted into a bush 40 having a predetermined axial length, which is press-fitted into the boss portion 37b of the bracket 37 of the sixth bracket 37, and is prevented from coming off by the disk 41 and the nut 38. At this time, the leg 36b and the bush 4
By setting 0 to a predetermined length, the link 35
6 so that it does not move or tilt in the plane including the shaft 36.

The following operations and effects are obtained by the configuration of the above embodiment. First, as shown in FIGS.
With the configuration in which the left and right assist cables 27, 27 are accommodated in the respective grooves of the left and right guide rails 20L, 20R for guiding the guide rollers 17, 18, the following operation and effect can be obtained. (1) traveling lanes 21b, 22b, 23b, 24b;
Cable lane 21 for assist cable 27
c, 22c, 23c and the same guide rail 20L, 2
The guide rollers 17 and 18 of the front window 16 and the pilot roller 33 that guides the assist cable 27 are provided adjacent to each other in a groove of 0R (hereinafter, represented by 21a), and grooves of the same guide rails 20L and 20R. The running lanes 21b, 22b, 23b and 24b provided in the inside 21a are rolled. For this reason, the moving direction of the guide roller 18 and the pulling direction of the assist cable 27 can always be substantially matched. At this time, even if the distal end portion of the assist cable 27 (in this example, the pilot roller 33 portion) and the front window 16 (in this example, the guide rollers 17 and 18) are connected by a link 35 having a short length, the conventional technology can be used. The lateral load caused by the tension of the assist cable 27 can be significantly reduced as compared with the one described. As a result, the guide rail 20
Even if L and 20R are formed with a small radius of curvature, the link 35
The moving direction of the guide roller 18 connected to the assist cable 27 via the cable and the pulling direction of the assist cable 27 always substantially match. For this reason, it becomes possible to connect the front wall 11 and the roof 12 of the cab 1 with a curved surface 13 having an arbitrary small radius of curvature.

(2) Traveling lanes 21b, 22b, 23
b, 24b and the cable lanes 21c, 22c, 23c are provided adjacent to each other in the grooves 21a in the same guide rails 20L, 20R. 20L and 20R have a single structure and can have a simple substantially U-shaped cross section, and therefore can be bent with a small radius of curvature. In addition, the weight and cost can be reduced. As a result, the present invention can be universally applied to cabs of various shapes.

(3) According to the results of the above (1) and (2), for example, when the present invention is applied to the substantially rectangular parallelepiped cab 1 shown in FIG. 1, as shown in FIG. When confirming the lower front, it is possible to bend forward and look into the cab 1 with the front window 16 closed.
Only at special times, for example, when it is necessary to look down on the bottom of a hole while excavating a deep hole in a hydraulic excavator or the like, the front window 16 may be pulled up. As a result, the front window 1
6 can be reduced, so that the burden on the operator can be reduced. (4) For the reasons (1) and (2) above, the guide rails 20L and 20R are divided into straight portions and bent portions, and the individual guide rails 21, 22, 23 and 24 having different shapes are connected in the longitudinal direction. The guide rail 20
The productivity of L and 20R is improved, and the types of parts can be integrated among multiple models.

Next, as shown in FIGS. 3 and 4, when the assist cable 27 is connected to the front window 16, a pilot roller 33 is attached to the tip of the assist cable 27, and a shaft 34 of the pilot roller 33 and the front window are connected. The following operation and effect can be obtained by having the connecting device 30 configured by connecting the 16 guide rollers 18 with the shaft 36 by the link 35.

(1) The guide rails 20L and 20R are bent with a small radius of curvature at the portion of the guide rail 22. The tension T of the assist cable 27 is guided by the pilot roller 33 and then through the link 35 through the guide roller. Since the power is transmitted to the shaft 36 of the motor 18, the moving direction of the guide roller 18 and the pulling direction of the assist cable 27 always substantially match. Similarly, since the link 35 is also guided by the pilot roller 33, the link 35 does not interfere with the guide rails 20L and 20R.

(2) The guide roller 18 and the shaft 36 of the front window 16 are relatively large to support the heavy front window 16, and require a large space. This guide roller shaft 3
By not connecting the assist cable 27 directly to the connector 6, but connecting the shaft at an offset position via the link 35, the axial width of the connecting device 30 can be shortened, and the opening and closing device is compact. it can. As a result, since the cross-sectional shape of the guide rails 20L and 20R can be reduced, a configuration in which the guide rails 20L and 20R are bent with a smaller radius of curvature becomes possible. As a result, the front window opening / closing device with the assist function can be universally applied to driver's cabs of various shapes.

Further, as shown in FIG. 3, the following operation and effect can be obtained by the structure of the link 35 connecting the shaft 34 of the pilot roller 33 and the shaft 36 of the guide roller 18. (1) Since the attachment position of the distal end of the assist cable 27 and the connection position of the link 35 are separated in the axial direction of the pilot roller shaft 34, the tension T of the assist cable 27
Acts as a force to move or tilt the link 35 in a direction other than around the axis with respect to the shaft 36 of the guide roller 18. On the other hand, the flange 3 provided on the shaft 36
6a and the mounting surface 37a of the frame 16b of the front window 16,
Due to the configuration in which the link 35 is sandwiched with a slight gap left therebetween, the link 35 is connected to the end surface of the flange 36a and the mounting surface 3.
7a and is guided and rotated. Therefore, the link 35 does not move or tilt in a direction other than around the axis 36 of the guide roller 18.

(2) Since the link 35 does not apply a thrust load to the guide roller 18 on the shaft 36, the guide roller 18 comes off and the outer end of the guide roller 18 and the guide rail 20L, 20L, 20
It is possible to prevent the occurrence of undulation with the inner wall 21d of the R groove 21a. (3) According to (1), the assist cable 27 is connected to the cable lane 2 provided in the groove of the guide rails 20L and 20R.
1c, 22c, and 23c are always located inside and do not come off, so that the guide cable 27 is
7 does not hinder the rolling, and the guide cable 27
From the guide rail 20R can also be prevented. As a result, in the configuration in which the assist cable 27 is laid in the guide rails 20L and 20R, reliability can be improved. (4) When the guide roller 18 is mounted on the mounting surface 37a, a link 3 is provided between the guide roller 18 and the frame 16b.
The link 35 that does not move or incline in a direction other than around the guide roller shaft 36 as described above can be attached only by adding a space only for the thickness of the flange 5 and the flange 36a.

Further, according to the configuration of the embodiment shown in FIG.
The following actions and effects can be obtained. (1) The link 35 is fixed to the intermediate portion of the shaft 36 of the guide roller 18, and the leg 36 b of the shaft 36 on the opposite side of the guide roller 18 is provided on the frame 16 b of the front window 16, and has a predetermined axial length. Since the bearing 35 is rotatably supported by the bearing bush 40, the link 35 does not move or tilt in a direction other than around the axis of the shaft 36. Therefore, the same effect as the embodiment of FIG. 4 can be obtained. (2) When attaching the guide roller 18 to the front window frame 16b, a link 35 is provided between the guide roller 18 and the frame 16b.
Only the thickness of the link 35 or the addition of a small space between the thickness of the link 35 and the welded portion allows the link 35 that does not move or tilt in a direction other than around the axis of the shaft 36 to be firmly attached. Can be configured.

In the above embodiment, the cable lane of the assist cable is provided near the inner wall of the groove of the guide rail. However, the gist of the present invention is not limited to the position of the guide rail, for example, the middle of the groove. It can also be configured in the vicinity of the part or opening side. In addition, although the guide rail is formed integrally as shown in FIG. 2, for example, as shown in FIG. 6, a cable lane is formed in a groove of a rail member 21e having a substantially U-shaped cross section. It is also possible to fix the groove member 21f.

As described above, the present invention has the following advantages. Since the guide rail for the assist cable is provided in the groove in the guide rail for the guide roller of the front window, the moving direction of the guide roller and the pulling direction of the assist cable substantially coincide with each other. The driver's cab can be formed into a shape having a portion, and an operator's cab of any shape can be manufactured. In addition, since the above-mentioned guide rail can have a single and simple cross-sectional shape, it can be manufactured by bending with a small radius of curvature, and can be reduced in weight and cost. Further, the pilot roller attached to the tip of the assist cable and the guide roller of the front window are rotatably connected by a link so that the link does not move or tilt in a direction other than around the guide roller axis. As a result, the disconnection of the link and the contact of the guide rollers with the guide rail groove wall surface can be prevented, and the fall of the assist cable from the cable lane in the guide rail groove can be prevented, so that the reliability of the opening and closing device can be improved. .

[Brief description of the drawings]

FIG. 1 is a side sectional view of a cab to which a front window opening / closing device with an assist function according to the present invention is applied.

FIG. 2 is a sectional view taken along line MM of FIG. 1;

FIG. 3 is a sectional view taken along line NN of FIG. 1;

FIG. 4 is a sectional view taken along the line PP of FIG. 3;

FIG. 5 is a view of another embodiment of the assist cable connecting device of the present invention.

FIG. 6 is a view showing another embodiment of the guide rail of the present invention.

FIG. 7 is a schematic perspective view of a cab of a work vehicle according to the related art.

FIG. 8 is a side view of a main part of a conventional front window opening / closing device with an assist function.

FIG. 9 is an operation explanatory view of an assist cable connecting device according to a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Operator's cab, 2R ... Right inner wall, 11 ... Front wall, 12 ... Roof, 13 ... Curved surface, 16 ... Front window, 16b ... Frame, 17, 18
... Guide rollers, 20R ... Guide rails, 21 ... Guide rails, 21a ... Grooves, 21b ... Running lanes, 21c ... Cable lanes, 22, 23, 24 ... Guide rails, 26
... Assist reel (assist device), 27 ... Assist cable, 30 ... Connecting device, 31 ... Eye joint, 33
... Pilot roller, 34 ... Pilot roller shaft, 35
... Link, 36 ... Shaft, 36a ... Flange, 36b ... Leg, 37 ... Bracket, 37a ... Mounting surface, 37b ... Boss, 38 ... Nut, 40 ... Bushing, 41 ... Disc.

Claims (4)

[Claims] A pair of left and right guide rails (20) mounted along a front wall (11) and a roof (12) of a cab (1) of a work vehicle.
(L, 20R), the guide rollers (17, 18) mounted on the left, right, up, and down of the front window (16) are rolled, and the front rollers (27) are connected to the front window (16) via the assist cable (27). In a front window opening / closing device with an assist function of a work vehicle that assists an opening operation of a window (16) by an assist device (26), a cable for guiding an assist cable (27) inside a groove of the guide rail (20L, 20R). A front window opening / closing device with an assist function for a work vehicle, wherein lanes (21c, 22c, 23c) are provided. 2. The front window opening / closing device with an assist function for a work vehicle according to claim 1, wherein a pilot roller (33) is rotatably connected to a distal end of an assist cable (27) by a shaft (34), and The shaft (34) of the roller (33) and the front window (1
The shaft (36) of the guide roller (18) of (6) is connected with the link (35), and the pilot roller (33) and the guide roller (18) are connected.
A front window opening / closing device with an assist function for a work vehicle, characterized in that the front and rear wheels are rolled on the same guide rail (20L, 20R). 3. The front window opening and closing device with an assist function for a work vehicle according to claim 2, wherein the link (35) includes an end face of a flange (36a) provided on a shaft (36) of a guide roller (18), A front window with an assist function for a working vehicle, wherein the front window is attached so as to be guided and rotated between a mounting surface (37a) of a frame (16b) of the front window (16) for mounting the shaft (36). Switchgear. 4. The front window opening / closing device with an assist function for a work vehicle according to claim 2, wherein the link (35) is fixed to an axially intermediate portion of a shaft (36) of a guide roller (18). Link
A leg (36b) of the shaft (36) opposite to the guide roller (18) across the (35) is provided on a frame (16b) of the front window (16) and has a predetermined axial length. A front window opening and closing device with an assist function for a work vehicle, which is rotatably supported by a bearing portion (40).