JPH0543005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a road surface shaping device equipped on an earthmoving vehicle.

<Prior Art> Earthmoving vehicles equipped with working blades have been widely used to shape road surfaces or remove snow from road surfaces.

However, the conventional earthmoving vehicles of this type are not fully satisfactory and have the following problems to be solved.

For example, a motor grader equipped with a working blade has a long overall vehicle length and a large turning radius, making it difficult to work on relatively narrow roads or roads with many curves. Further, the position of the working blade is considerably closer to the front wheel than the center of gravity of the vehicle body, and therefore a large penetration force cannot be obtained.

Furthermore, for example, in a wheel loader equipped with a working blade, the working blade is attached to the front end of the earthmoving vehicle and placed in front of the front wheels, and therefore,
It is not possible to obtain a large penetration force, making it particularly difficult to remove compacted snow and ice burns, and furthermore to shape hard gravel. Further, due to the above-mentioned factors, pitching of the front and rear wheels is likely to occur during work, and when such pitching occurs, it is difficult to level the road surface. Particularly in a vehicle in which the working blade is disposed in front of the front wheel, the pitching causes the blade to move up and down relatively significantly, making it even more difficult to level the road surface.

<Objective of the Invention> The main object of the present invention is to be applicable to relatively small earthmoving vehicles, to obtain a large penetration force, and to be able to substantially level the road surface regardless of unevenness. An object of the present invention is to provide an improved road shaping device.

<Summary of the Invention> In order to achieve the above main object, according to the present invention,
A support body installed below the vehicle body, a working blade attached to the support body, a link mechanism for attaching the support body to the vehicle body, and an elevating mechanism for moving the support body up and down. the working blade has a right blade and a left blade, and inner ends of the right blade and the left blade respectively have pivot centers extending vertically at the front end of the support body. A road surface characterized in that the right blade and the left blade are connected to each other so as to be pivotable in the front and rear directions about an axis, and angle hydraulic cylinder mechanisms are interposed between the right blade and the left blade, respectively, and the support body. A shaping device is provided.

<Preferred Specific Examples of the Invention> Hereinafter, specific examples of a road surface shaping device constructed according to the present invention will be described with reference to the accompanying drawings.

First, a first specific example of a road shaping device constructed according to the present invention will be described with reference to FIGS. 1 to 5.

1 to 3, and mainly to FIG. 2, the illustrated road surface shaping device 2 includes a support 4, a working blade 6, a link mechanism 8 for attaching the support 4, and a support 4. A lifting fluid pressure cylinder mechanism 10 is provided for raising and lowering movement.

The illustrated support body 4 has a substantially triangular shape, and extends from the center in the width direction (in the direction perpendicular to the plane of the paper in FIG. 1, in the left-right direction in FIGS. 2 and 3) toward the right and rearwardly. A front right frame 12, a front left frame 14 extending from the center in the width direction toward the left in an inclined rearward direction, and a rear frame 1 connecting the rear end portions of the front right frame 12 and the front left frame 14.
6.

The illustrated working blade 6 has a right blade 18 and a left blade 20. Referring also to FIG. 3, the right blade 18 is disposed corresponding to the right front frame 12 of the support 4, and the blade 20 is disposed corresponding to the left front frame 14. The inner end portion of the support member 4 is attached to the front end portion of the support body 4, that is, the triangular top portion thereof, so as to be freely pivotable in the front-rear direction. That is, in the specific example, a pair of support brackets 22a and 22b are provided at the front end portion (i.e., the connecting portion between the right front frame 12 and the left front frame 14) at the widthwise central portion of the support body 4 at an interval in the vertical direction. It is being On the other hand, a connecting bracket 24 is provided at the inner end (left end in FIG. 2) of the right blade 18 (more specifically, one end of the connecting bracket 24 is connected to the right blade 1
8, and the other end is the right blade 1.
8), and the left blade 20
A connecting bracket 26 is also provided at the inner end (right end in FIG. 2) of the connecting bracket 26. Specifically, one end of the connecting bracket 26 is fixed to the back surface of the left blade 20, and the other end is connected to the left blade 20. somewhat prominent). Connection bracket 24 of right blade 18 and connection bracket 2 of left blade 20
6 is positioned between the pair of support brackets 22a and 22b of the support body 4, as shown in FIG.
By installing the pin 28 (FIG. 2) through these brackets, the right blade 18 and the left blade 20 are rotated as shown by arrows 30 and 32 about the pin 28 (which constitutes a pivot axis extending in the vertical direction). It is mounted so that it can rotate freely in the front and rear directions.

Angling fluid pressure cylinder mechanisms 34a and 34b are interposed between the right blade 18 and the left blade 20 and the support body 4, respectively. In the specific example, the angle fluid pressure cylinder mechanisms 34a and 34b are constructed from well-known trunnion type fluid pressure cylinder mechanisms, and in one (right) angle fluid pressure cylinder mechanism 34a, its cylinder body 36 is A pair of connecting brackets 4 are rotatably mounted on a mounting member 38 mounted on the right front frame 12 of the support body 4, and the output rod 40 thereof is fixed to the back surface of the right blade 18.
2 (FIG. 3), and in the other (left) angle hydraulic cylinder mechanism 34b, its cylinder body 44 is pivoted to a mounting member 46 attached to the left front frame 14 of the support body 4. A pair of connecting brackets 5 are freely attached, and the output rod 48 is fixed to the back surface of the left blade 20.
0 (Fig. 3). With this structure, as shown in FIG. 2, when the angle hydraulic cylinder mechanism 34a (or 34b) extends, the right blade 18 (or left blade 2
0) is pivoted forward as shown by the arrow 30 about the pin 28, while when the angle hydraulic cylinder mechanism 34a (or 34b) retracts, the right blade 18 (or left blade 20) is pivoted forward as shown by the arrow 30 about the pin 28. 32, and the right blade 18 (or left blade 20) therefore moves between the maximum forward rotation position shown by the two-dot chain line in FIG. 2 and the maximum rear rotation position shown by the solid line in FIG. It can be rotated freely. In the illustrated example, as shown in FIG. 2, when the right blade 18 is at the maximum forward rotation position and the left blade 20 is at the maximum rear rotation position, the working blade 6 is at one end (in FIG. The right blade 18 extends obliquely in a straight line from the right end (right end) to the other end (left end in FIG. 2) in the front and back direction (left and right direction in FIGS. 1 and 2). is at the maximum rearward turning position and the left blade 20 is at the maximum forward turning position. When the blade 18 and the left blade 20 are at the maximum rearward turning position, the working blade 6 extends rearward in the front-rear direction in a V-shape from the central portion of the support body 4 in the width direction toward both sides.

Mainly referring to FIG. 3, in the specific example, the lower ends of the right blade 18 and the left blade 20 are further provided with cutting edges 52 and 54 is installed. The cutting edges 52 and 54 are
A substantially continuous cutting edge surface is defined at the lower ends of the right blade 18 and the left blade 20 over substantially their entire width (width in the left-right direction in FIGS. 2 and 3). Furthermore, the outer ends of the right blade 18 and the left blade 20 are provided with auxiliary blades 56 and 58 whose front surfaces are concavely curved and extend upward. Incidentally, as will be easily understood from the description below, the working blade 6
When the road surface shaping device 2 is constructed from an earth removal blade as shown in the figure, the road surface shaping device 2 can be conveniently used for road surface shaping work such as gravel roads, general land leveling work, etc. On the other hand, the work blade 6 may be replaced with an ice burn peeling blade (for example, the soil removal cutting edges 52 and 54 attached to the right blade 18 and the left blade 20).
In place of this, by attaching a cutting edge for ice burn removal whose lower end is serrated, it can be used as an ice burn removal blade.In such a case, the road surface The shaping device 2 can be conveniently used for removing compacted snow from roads, removing ice burns, and the like.

The support 4 with the working blade 6 is mounted as required via a linkage 8 to the body of an earthmoving vehicle, preferably a wheel loader. 1st again
2 and 2, the illustrated vehicle body 60, such as a wheel loader, has a pair of front wheels 62 (second
Figure 1) is installed as required at the front of the vehicle (only a portion of its front frame 64 is shown in Figure 1).
and a rear portion of the vehicle (only a portion of which rear frame 68 is shown in FIGS. 1 and 2), on which a pair of rear wheels 66 (FIG. 2) are mounted as required;
The rear end portion of the front frame 64 and the front end portion of the rear frame 68 are connected to be pivotable about a pivot axis 70 (FIG. 1) extending in the vertical direction.
In a specific example, the support body 4 is connected to the vehicle main body 60 via the link mechanism 8 as follows.
is installed below the

To further explain, the illustrated link mechanism 8 includes a front link means 72 and a pair of rear link means 74 and 76, and the front link means 72 and the pair of rear link means 74 and 76 each have a rod-shaped link member 78. , 80 and 82.
The link member 78 is disposed approximately at the center of the vehicle body 60 in the lateral direction (direction perpendicular to the plane of the paper in FIG. 1, horizontal direction in FIG. 2), preferably substantially at the center, and has one end, that is, a lower end, supported It is rotatably connected to the front end of the body 4, and the other end, ie, the upper end, is rotatably connected to the rear of the vehicle body 60. In the specific example, the link member 78 is curved into a somewhat L-shape, and one end of the link member 78 is connected to a bracket means 84 provided at the front end of the support 4 at substantially the center in the width direction via a pin member. The other end is pivotally connected via a pin member to a bracket means 88 provided substantially at the longitudinal center of a cross member 86 connected between both sides of the rear frame 68. has been done. The pair of link members 80 and 82 are arranged at intervals in the lateral direction of the vehicle main body 60, one end, that is, a lower end thereof, is rotatably connected to the rear end of the support 4, and the other The end portion, that is, the upper end portion is rotatably connected to the rear portion of the vehicle body 60. In the specific example, one end of the link member 80 is rotatably connected to a bracket means 90 provided at the right end of the rear frame 16 of the support body 4 via a pin member, and the other end is connected to an axle housing 92 at the rear of the vehicle. It is rotatably connected via a pin member to a bracket means 94 provided at the lower right end portion of the bracket. Further, one end of the link member 82 is rotatably connected to a bracket means 96 provided at the left end of the rear frame 16 of the support body 4 via a pin member, and the other end is connected to the lower left end of the axle housing 92. bracket means 9 provided in
8, and is rotatably connected to. In the vehicle main body 60, a well-known oscillation mechanism is employed in connection with the rear wheels 66, and the axle housing 92 is vertically pivotable. That is, both ends of a pair of trunnion supports 100 and 102 are installed between the right and left parts of the rear frame 68 at the rear of the vehicle with an interval in the front-rear direction.
A central portion of an axle housing 92 is rotatably mounted between the axle housing 92 and 102 about an axis extending in the front-rear direction (left-right direction in FIG. 2). As described above, the axle housing 92 of the specific example is pivotable relative to the rear of the vehicle over a predetermined angular range about the pivot axis.

In the specific example, a pair of link members 80 and 82
are attached with auxiliary arms 104 and 106, respectively. One end of the auxiliary arm 104 is fixed to one end of the link member 80, and the other end is fixed to the bracket means 1 provided on the axle housing 92.
08 via a pin member so as to be rotatable. One end of the other auxiliary arm 106 is fixed to one end of the link member 82, and the other end is rotatably connected to a bracket means 110 provided on the axle housing 92 via a pin member. Furthermore, the link members 80 and 82 and the auxiliary arms 104 and 106 are connected via a connecting member 112.

The fluid pressure cylinder mechanism 10 is disposed approximately in the lateral center of the vehicle body 60, preferably substantially in the center, and is interposed between the rear part of the support body 4 and the rear part of the vehicle. In the specific example, the output rod 114 of the hydraulic cylinder mechanism 10 is mounted on a bracket means 116 provided in the axially central portion of the rear frame 16 of the support 4.
The cylinder body 118 is rotatably connected to the bracket means 120 provided at the longitudinal center of the trunnion support 100 via a pin member.
is rotatably connected to via a pin member.
Therefore, as shown in FIG. 1, when this fluid pressure cylinder mechanism 10 is expanded (or contracted), the support body 4 partially lowers to the lowest position shown by the two-dot chain line (or the highest position shown by the solid line). (or rise)

The illustrated road surface shaping device 2 is installed below the rear portion of the vehicle main body 60 via the link mechanism 8 as described above, as shown in FIGS. 1 and 2.

That is, the working blade 6 (i.e., the right blade 18
and the left blade 20) is the front wheel 62 of the vehicle body 60.
and the rear wheel 64, more preferably, as in the specific example, the center axis of rotation of the right blade 18 and the left blade 20 is located near the center of gravity of the vehicle body 60 (in other words, the center axis of rotation of the right blade 18 and the left blade 20 is located near the center of gravity of the vehicle body 60). and the turning center axes of both the front and rear portions of the vehicle body 60 are substantially aligned in the vertical direction (FIG. 1). Therefore, substantially the entire weight of the vehicle body 60 can be transmitted to the working blade 6 as a penetrating force, and thereby a large penetrating force and cutting force can be obtained. Furthermore,
Since the working blade 6 is arranged as described above,
Pitting of the front wheels 62 and rear wheels 66 is less likely to occur, and even if pitching occurs, it has little effect on the working blade 6.

Furthermore, the linkage 8, i.e. the front link means 72 and the pair of rear link means 74 and 76, substantially constitute a parallel linkage (FIG. 1), and therefore the support 4 and therefore the working blade 6 is moved up and down while being held substantially horizontally by the expansion and contraction of the hydraulic cylinder mechanism 10.

In the road surface shaping device 2 of the specific example, a pair of angle fluid pressure cylinder mechanisms 34a and 34b
The operation is controlled by a fluid pressure control system as shown in FIG.

Referring to FIG. 4, the illustrated fluid pressure control system includes electromagnetic flow path switching valves 122 and 124 corresponding to a pair of fluid pressure cylinder mechanisms 34a and 34b. The electromagnetic flow path switching valves 122 and 124 are selectively positioned at a neutral position, a first operating position, and a second operating position shown in FIG. One (right) corresponding to the fluid pressure cylinder mechanism 34a
When in the neutral position, the electromagnetic flow path switching valve 122 connects a fluid pressure source 126 such as a hydraulic pump, a fluid reservoir 128 such as a hydraulic tank, and the extension side (head side) and contraction side (rod side) of the fluid pressure cylinder mechanism 34a. However, when in the first operating position, the fluid pressure source 126 and the contraction side of the fluid pressure cylinder mechanism 34a communicate with each other, and the fluid reservoir 128 and the extension side of the fluid pressure cylinder mechanism 34a communicate with each other. When in the second operating position, the fluid pressure source 126 communicates with the extension side of the fluid pressure cylinder mechanism 34a, and the fluid reservoir 128 communicates with the contraction side of the fluid pressure cylinder mechanism 34a. Furthermore,
The other (left) electromagnetic flow path switching valve 124 corresponding to the fluid pressure cylinder mechanism 34b has a fluid pressure source 126 and a fluid reservoir 128 when in the neutral position.
Although there is no communication between the extension side (head side) and the contraction side (rod side) of the fluid pressure cylinder mechanism 34b, when the fluid pressure source 126 and the fluid pressure cylinder mechanism 34b are in the first working position, the contraction of the fluid pressure source 126 and the fluid pressure cylinder mechanism 34b The fluid pressure source 126 and the extended side of the hydraulic cylinder mechanism 34b communicate with each other when in the second working position, and the fluid reservoir 128 communicates with the extended side of the hydraulic cylinder mechanism 34b. 128 and the contraction side of the fluid pressure cylinder mechanism 34b.

The electromagnetic flow path switching valves 122 and 124 are switched by a switching switch 130 (right switching switch) and a switching switch 132 (left switching switch). These changeover switches 130 and 132 are arranged at the driver's seat of the vehicle body 60. In addition, in the specific example, the right blade 18 and the left blade 20
When the vehicle main body 60 is turned left and right (that is, when the front part of the vehicle and the rear part of the vehicle are bent), a part of the front part of the vehicle is rotated freely in the front and rear directions.
There is a risk of interference with the left blade 20 and the left blade 20, and right detection means and left detection means are provided to avoid such interference. The right detection means in the specific example is composed of a permanent magnet 134 and a reed switch 136 (right changeover switch) that detects the permanent magnet 134, and the permanent magnet 134 is located at a required position at the front of the vehicle (in the illustrated specific example, as shown in FIG. 1). As shown, the reed switch 136 is attached to a depending portion 138 depending from the front frame 64.
Corresponding to the permanent magnet 134, the right blade 18
(See also Figure 2).
Further, the left detection means also includes a permanent magnet 140 and a reed switch 142 (left changeover switch) that detects the permanent magnet 140.
Like the permanent magnet 134, it is attached to a predetermined location on the front of the vehicle, and the reed switch 142 is attached to a predetermined location on the left blade 20 in correspondence with the permanent magnet 140 (see also FIG. 2). The electromagnetic flow path switching valves 122 and 124 are also switched by the reed switches 136 and 142 described above.

To explain further, terminal 1 of the changeover switch 130
30a is connected to the power source E, its terminal 130b is connected to the terminal 136d of the reed switch 136, and its terminal 130c is connected to the solenoid 122A of the electromagnetic flow switching valve 122 and the terminal 136c of the reed switch 136, and its terminal 130d
is the other solenoid 12 of the electromagnetic flow path switching valve 122
Connected to 2B. Also, reed switch 1
36 remaining terminals 136a and 136b, respectively, are
Connected to power supply E. Therefore, when the changeover switch 130 is operated to connect the terminals 130a and 130c, the solenoid 122A of the electromagnetic flow path changeover valve 122 is energized and brought to the first operating position, and the changeover switch 130 is also operated. When connecting terminal 131b and terminal 130d, terminal 1
36b and the terminal 136d are connected to each other via the reed switch 136.
The solenoid 122B is energized and brought to the second operating position. On the other hand, reed switch 1
36 detects the permanent magnet 134, the terminal 136
The connection between the terminal 136d and the terminal 136d is released, and the terminal 136a and the terminal 136c are connected, and the electromagnetic flow path switching valve 122 is opened via the reed switch 136.
The solenoid 122A is energized to the first operating position. In such a situation,
Since the connection between the terminal 136b and the terminal 136d has been released, the changeover switch 130 must be operated to switch the terminal 1
Even if 30b and terminal 130d are connected, solenoid 122B of electromagnetic flow path switching valve 122 is not energized.

Also, in the changeover switch 132, its terminal 132a is connected to the power supply E, and its terminal 132a is connected to the power supply E.
b is connected to the terminal 142d of the reed switch 142, and the terminal 132c is connected to the electromagnetic flow path switching valve 124.
solenoid 124A and reed switch 142
is connected to the terminal 142c of the
d is the solenoid 124B of the electromagnetic flow switching valve 124
It is connected to the. In addition, the reed switch 142
The remaining terminals 142a and 142b are connected to power supply E, respectively. Therefore, the changeover switch 13
2 to connect terminal 132a and terminal 132c, solenoid 1 of electromagnetic flow path switching valve 124
24A is energized and brought to the first working position, and the selector switch 132 is operated to switch the terminal 1
32b and the terminal 132d, the terminal 142
The solenoid 124B of the electromagnetic flow path switching valve 124 is forced to the second operating position via the reed switch 142 in which the solenoid 124B and the terminal 142d are connected. On the other hand, reed switch 142
detects the permanent magnet 140, the connection between the terminal 142b and the terminal 142d is released, and the terminal 14
2a and the terminal 142c are brought into a connected state, and the solenoid 124A of the electromagnetic flow path switching valve 124 is energized via the reed switch 142 and brought to the first operating position. In such a state, since the terminal 142b terminal 142d is disconnected, the changeover switch 132 is operated to switch the terminal 132b
Even if the terminal 132d is connected, the electromagnetic flow path switching valve 12
No. 4 solenoid 124B is never energized.

In addition, in the specific example, the flow path 144 connecting the fluid pressure source 126 and the electromagnetic flow path switching valve 122 and the fluid pressure source 1
26 and the flow path 14 connecting the electromagnetic flow path switching valve 124
6 are provided with check valves 148 and 150, respectively, as shown in FIG.

Next, along with Figures 1 and 2, Figures 4 and 5
The effects of the road surface shaping device 2 having the above-described configuration will be explained with reference to the drawings.

Mainly referring to FIGS. 1 and 2, the vehicle body 60 equipped with the road surface shaping device 2 is indicated by the arrow 14.
When the vehicle moves forward in the direction indicated by 4 (FIG. 1), the working blade 6 acts on the road surface 146 as the vehicle main body 60 moves forward, and thus the road surface 146 can be shaped as required. During such shaping work, as can be understood from FIG.
The load acting on link members 78, 80 and 8
2 and the hydraulic cylinder mechanism 10 to the rear of the vehicle.

Then, when the fluid pressure cylinder mechanism 10 is expanded (or contracted), the link members 78, 80 and 8
2 are each pivoted clockwise (or counterclockwise) in FIG. 1 about the other end, so that the support 4 is lowered (or raised) as required. During such lowering (or raising), the support 4 and therefore the working blade 6 are moved substantially in parallel, so that the cutting angle of the working blade 6 does not substantially change.

Further, the entire road shaping device 2 is compactly arranged between the front wheels 62 and the rear wheels 66 of the vehicle body 60, and the hydraulic cylinder mechanism 10 is further contracted to form the working blade 6 as shown by the solid line in FIG. By setting it to the maximum raised position, sufficient ground clearance (height from the ground to the lowest part of the road surface shaping device 2) can be secured, and damage caused by collision with the ground etc. can be avoided. can.

In the road shaping device 2 of the specific example, the link member 78 is further connected to the rear part of the vehicle, and the link members 80 and 82 are pivotable relative to the rear part of the vehicle about a pivot axis extending in the longitudinal direction. Since the support body 4 and thus the working blade 6 are connected to the axle housing 92 mounted on the vehicle, the support body 4, and therefore the working blade 6, are allowed to pivot vertically relative to the rear of the vehicle about the pivot axis. . Therefore, one front wheel 6 of the vehicle body 4
2 (for example, the right front wheel shown in FIG. 1) rides on a protrusion (or recess) on the road surface 146, the vehicle body 60 (front and rear of the vehicle) moves leftward (or rightward). tilt. At this time, the pair of rear wheels 66 are not riding on the protrusion (or recess), and therefore the vehicle body 60 is relatively leftward with respect to the rear wheels 66 and the axle housing 92 held substantially horizontally. (or to the right), the support 4 and thus the working blade 6 continue to be held substantially horizontally. In particular, since the rear wheel 66 is located behind the working blade 6, the road surface 146 is shaped by the action of the working blade 6.
As a result, the working blade 6 is held horizontally more effectively. As shown above, the working blade 6 is attached to the road surface 14.
6, the road surface 146 is held substantially horizontally, and the road surface 146 can be shaped substantially evenly. As in the specific example, in order to pivot the support body 4, and thus the working blade 6, relative to the rear of the vehicle about the pivot axis extending in the front-rear direction, one end of the link member 78, i.e. Preferably, the lower end and the cylinder body 118 of the hydraulic cylinder mechanism 10 are connected to the rear of the vehicle via a ball joint.

Mainly referring to FIG. 4, in the road shaping device 2 as described above, the changeover switch 130 (or 132) is operated to connect the terminal 130a (or 132a).
When the terminal 130c (or 132c) is connected, the solenoid 122A (or 124A) is energized and the electromagnetic flow path switching valve 122 (or 124) is moved from the neutral position to the first operating position. In this way, the flow path 144 (or 146) and the flow path 152 (or 154) are communicated, and the flow path 156 (or 158) and the flow path 160 (or 162) are communicated, and the fluid pressure from the fluid pressure source 126 is is the contraction side (rod side) of the fluid pressure cylinder mechanism 34a (or 34b)
and the fluid pressure cylinder mechanism 34a.
The fluid on the extension side (head side) of (or 34b) is returned to the fluid reservoir 128. Thus, the hydraulic cylinder mechanism 34a (or 34b) is retracted, and the right blade 18 (or left blade 20) is pivoted rearward as indicated by the arrow 32 about the pin 28. Contrary to the above, by operating the changeover switch 130 (or 132), the terminal 130b (or 132
When b) is connected to the terminal 130d (or 132d), the solenoid 122B (or 124B) is energized and the electromagnetic flow path switching valve 122 (or 124) is moved from the neutral position to the second operating position. In this way, the flow path 144 (or 146) and the flow path 16
0 (or 162) and the flow path 156
(or 158) and the flow path 152 (or 154), fluid pressure from the fluid pressure source 126 is supplied to the extension side of the fluid pressure cylinder mechanism 34a (or 34b), and the fluid pressure source 126 is supplied to the extension side of the fluid pressure cylinder mechanism 34a (or 3
The fluid on the contraction side of 4b) is returned to the fluid reservoir 128. Thus, the hydraulic cylinder mechanism 34a (or 34b) is extended and the right blade 18 (or left blade 20) is pivoted forward as indicated by the arrow 30 about the pin 28. Therefore, as shown in Fig. 2, selector switch 1 is
By operating the blades 30 and 132, the right blade 18 and the left blade 20 can be brought to a desired position between the maximum backward turning position shown by the solid line and the maximum forward turning position shown by the two-dot chain line.

This road shaping device 2 is further configured to avoid interference between the front portion of the vehicle body 60 and the right blade 18 (or left blade 20) as follows. That is, mainly referring to FIG. 5, the permanent magnet 134 (or 14
0) is the reed switch 136 (or 142) attached to the right blade 18 (or left blade 20)
When approaching or touching the reed switch 136
(or 142) is a permanent magnet 134 (or 140)
is detected, the connection between the terminal 136b (or 142b) and the terminal 136d (or 142d) is released, and the connection between the terminal 136a (or 142a) and the terminal 136c is released.
(or 142c). Thus, the reed switch 136 (or 142) generates a proximity signal, and the proximity signal causes the electromagnetic flow path switching valve 122 to
(or 124) solenoid 122A (or 124)
A) and solenoid 122A (or 12
4A), the electromagnetic flow path switching valve 122 (or 124) is automatically moved from the neutral position to the first operating position. When thus positioned in the first operating position, the flow path 14 is opened as described above.
The fluid pressure source 1
The fluid pressure from 26 is transferred to the fluid pressure cylinder mechanism 34a.
(or 34b) to the contraction side (rod side) and the fluid pressure cylinder mechanism 34a (or 34b)
The fluid on the extension side (head side) is returned to the fluid reservoir 128. Thus, the right blade 18 at the front of the vehicle
(or the left blade 20), the angle fluid pressure cylinder mechanism 34a (or 34b) is contracted, and the right blade 18 (or the left blade 20) is contracted.
0) is turned rearward as shown by an arrow 32 around the pin 28, and this backward turning movement causes the front part of the vehicle and the right blade 18 (or left blade 2
0) is reliably avoided.

On the other hand, when the front of the vehicle separates from the right blade 18 (or left blade 20), the reed switch 136 (or 142) moves away from the permanent magnet 1, as shown in FIG.
34 (or 140) will no longer be detected. Thus, the reed switch 136 (or 142) connects the terminal 136a (or 142a) and the terminal 136c (or 1
42c) and terminal 136b.
(or 142b) and terminal 136d (or 142d)
and stop generating the approach signal described above.
When the supply of the proximity signal is finished, the solenoid 122A of the electromagnetic flow switching valve 122 (or 124)
(or 124A) is deenergized, and the electromagnetic flow path switching valve 1
22 is brought to the neutral position, and the contraction of the above-mentioned fluid pressure cylinder mechanism 34a (or 34b) is stopped.

In the specific example of the road shaping device, in order to prevent interference between the front part of the vehicle and the right blade 18 (or left blade 20) due to erroneous operation of the changeover switch 130 (or 132), the following features are further provided. do. That is, the reed switch 136 (or 14
2) is generating the approach signal, the connection between the terminal 136b (or 142b) and the terminal 136d (or 142d) is released. Therefore, the changeover switch 130 (or 13
2) to connect terminal 130b (or 142b) and terminal 130d (or 142d), solenoid 1 of electromagnetic flow path switching valve 122 (or 124)
22B (or 124B) is not energized, so even if the changeover switch 130 (or 132) is operated incorrectly, the hydraulic cylinder mechanism 34a (or 34b) will not be extended, and the front of the vehicle and the right blade 18 due to the incorrect operation will be (or left blade) interference is also reliably prevented.

The front of the vehicle and the right blade 18 (or left blade 2)
0) In order to prevent interference, please refer to Figures 4 and 5.
Instead of the control system shown in the figure, the control systems shown in FIGS. 6 and 7 can also be adopted. In addition, in FIGS. 6 and 7, members that are substantially the same as those shown in FIGS. 1 to 5 will be described with the same reference numerals.

In FIG. 6, the fluid pressure control system of the modified example includes a pair of angle fluid pressure cylinder mechanisms 34a and 3.
4b, manual flow path switching valves 170 and 17
It is equipped with 2. Manual flow switching valves 170 and 1
72 can be selectively moved to the neutral position, first operating position, and second operating position shown in FIG. 6 by manual operation. One manual flow path switching valve 1 corresponding to the fluid pressure cylinder mechanism 34a
70 communicates the fluid pressure source 126 such as a hydraulic pump and the fluid reservoir 128 such as an oil tank with the extension side (head side) and contraction side (rod side) of the fluid pressure cylinder mechanism 34a when in the neutral position. However, when in the first operating position, the fluid pressure source 126 and the extension side of the fluid pressure cylinder mechanism 34a communicate with each other, and the fluid reservoir 128 and the contraction side of the fluid pressure cylinder mechanism 34a communicate with each other, and the second
When in the operating position, the fluid pressure source 126 and the contraction side of the fluid pressure cylinder mechanism 34a communicate with each other, and the fluid reservoir 128 and the extension side of the fluid pressure cylinder mechanism 34a communicate with each other. Furthermore, the other manual flow path switching valve 172 corresponding to the fluid pressure cylinder mechanism 34b
is in the neutral position, the fluid pressure source 126
Although the fluid reservoir 128 and the extension side (head side) and contraction side (rod side) of the fluid pressure cylinder mechanism 34b are not communicated with each other, when it is in the first operating position, the fluid pressure source 126 and the fluid pressure cylinder mechanism 34b are connected to each other. The extension side of the mechanism 34b communicates with the fluid reservoir 128 and the contraction side of the hydraulic cylinder mechanism 34b, and when in the second operating position, the fluid pressure source 1
26 and the fluid pressure cylinder mechanism 34b communicate with the contraction side, and the fluid reservoir 128 and the fluid pressure cylinder mechanism 3
The extension side of 4b is communicated.

In the modified example, a manual flow path switching valve 17 is further provided.
0 and the extension side of the fluid pressure cylinder mechanism 34a, the flow path 174 communicates with the fluid reservoir 128 via the (right) on-off valve 176, and the manual flow path switching valve 1
72 and the extension side of the fluid pressure cylinder mechanism 34b is communicated with the fluid reservoir 128 via a (left) on-off valve 180. On the other hand, the operating part 1 of the on-off valve 176 is located at the front of the vehicle body 60.
A pressing piece 182 is provided corresponding to the opening/closing valve 76a, and a pressing piece 184 is provided corresponding to the operating portion 18a of the on-off valve 180.

In a road shaping device equipped with a fluid pressure control system as described above, the manual flow path switching valve 170 (or 17
2) to the first working position, the flow path 186 (or 188) and the flow path 174 (or 17
8) are communicated with each other, and the flow path 190 (or 19
2) and the flow path 194 (or 196), and the fluid pressure from the fluid pressure source 126 is supplied to the extension side (head side) of the fluid pressure cylinder mechanism 34a (or 34b), and the fluid pressure cylinder mechanism 34a The fluid on the contraction side (rod side) of (or 34b) is in the fluid reservoir 1
Returned to 28. Thus, the hydraulic cylinder mechanism 34a (or 34b) is extended and the right blade 1
8 (or left blade 20) is pivoted forward as indicated by arrow 30 about pin 28. On the other hand, contrary to the above, manual flow path switching valve 17
0 (or 172) to the second operating position, the flow path 186 (or 188) and the flow path 19
4 (or 196) are communicated and the flow path 190
(or 192) and the flow path 174 (or 178), and the fluid pressure from the fluid pressure source 126 is supplied to the contraction side of the fluid pressure cylinder mechanism 34a (or 34b), and the fluid pressure cylinder mechanism 34a (or 3
The fluid on the extension side of 4b) is returned to fluid reservoir 128. Thus, the hydraulic cylinder mechanism 34a (or 34b) is retracted and the right blade 18 (or left blade 20) is pivoted rearward as indicated by the arrow 32 about the pin 28.

In addition, in such a modification, when the front part of the vehicle approaches or contacts the right blade 18 (or left blade 20), as shown in FIG. 7, when the front part of the vehicle makes a right turn (or left turn), The pressing piece 182 (or 184) provided on the opening/closing valve 176
(or 180), and the on-off valve 176 (or 180) is made to open from the closed state. Thus, the fluid pressure cylinder mechanism 3
Channel 1 connected to the extension side of 4a (or 34b)
74 (or 178) is the on-off valve 176 (or 18)
0) to the fluid reservoir 128, and the on-off valve 1
Fluid return to fluid reservoir 128 is allowed through 76 (or 180). Therefore, when the front part of the vehicle acts on the right blade 18 (or left blade 20), the hydraulic cylinder mechanism 34a (or 34b)
is allowed to retract, the right blade 18 (or left blade 20) is pivoted rearward as indicated by arrow 32 by the front of the vehicle, thus preventing interference between the front of the vehicle and the right blade 18 (or left blade 20). Avoided.

As described above, similar effects can be achieved by using the fluid pressure control systems shown in FIGS. 6 and 7 instead of the fluid pressure control systems shown in FIGS. 4 and 5.

The on-off valves 176 and 1 shown in FIGS. 6 and 7, that is, the on-off valves 176 and 1 that are opened when the front part of the vehicle acts on the operating portion 176a (or 180a)
Instead of 80, an electromagnetic on-off valve can also be used. In such a case, as in the specific examples shown in FIGS. 1 to 5, right detection means consisting of, for example, a permanent magnet disposed at the front of the vehicle and reed switches disposed on the right blade and the left blade; A left detection means is provided, and when the reed switches of the right detection means and the left detection means detect a permanent magnet, they each generate an approach signal, and based on the proximity signal from the right detection means, the reed switch attached to one of the fluid pressure cylinder mechanisms ( The right) electromagnetic on-off valve is opened, and the (left) electromagnetic on-off valve attached to the other fluid pressure cylinder mechanism is opened based on the proximity signal from the left detection means.

Although specific examples of the road surface shaping device configured according to the present invention have been described above, the present invention is not limited to such specific examples, and various modifications and modifications can be made without departing from the scope of the present invention. It is possible.

For example, in the specific example shown, the link means 72, 74 and 76 of the link mechanism 8 are constituted by link members 78, 80 and 82, respectively, but instead of this, any of the link means 72, 74 and 76 may be One or two of them may be constructed from a telescopic fluid pressure cylinder mechanism, and in this case, the road surface shaping device can be used for a wider range of applications.

In addition, in the illustrated example, the link mechanism 8
The link mechanism 8 is composed of three link means, but is not limited to this, and as disclosed in the specification and drawings of Japanese Patent Application No. 61-103151, the link mechanism 8 is composed of four link means. It can be similarly applied to a structure composed of

Furthermore, if desired, in order to prevent interference between the front part of the vehicle and the right blade 18 (or left blade 20), the electromagnetic flow switching valve 122 (or 124) may be activated when the front part of the vehicle is turning right (or turning left). When the right blade 18 (or left blade 20 is turned backward after being switched to the first operating position), the electromagnetic flow path switching valve 122 (or 124) is switched to the second operating position in conjunction with the steering return operation. Alternatively, the right blade 18 (or left blade 20) may be switched forward to return to its original position.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a part of an earthmoving vehicle equipped with a specific example of a road shaping device according to the present invention. Second
FIG. 1 is a plan view showing the road shaping device shown in FIG. 1. Third
2 is a front view showing a working blade in the road shaping device shown in FIG. 2. FIG. FIG. 4 is a diagram showing a control system for controlling the angle fluid pressure cylinder mechanism in the road shaping device shown in FIG. 2. FIG. 5 is a diagram showing a state when the front part of the vehicle and the right blade are close to or in contact with each other in the control system of FIG. 4. FIG. 6 is a diagram showing a modification of the control system for controlling the angle fluid pressure cylinder mechanism. FIG. 7 is a diagram showing a state in which the front part of the vehicle and the right blade are close to each other or in contact with each other in the modification of FIG. 6; 2... Road shaping device, 4... Support body, 6... Working blade, 8... Link mechanism, 10... Lifting fluid pressure cylinder mechanism, 18... Right blade, 2
0...Left blade, 28...Pin (swivel center axis), 34a and 34b...Fluid pressure cylinder mechanism for angle, 60...Vehicle body, 62...Front wheel,
66... Rear wheel, 72, 74 and 76... Link means, 92... Axle housing, 122 and 1
24...Solenoid flow path switching valve, 130 and 132...
Changeover switch, 134 and 140...Permanent magnet,
136 and 142...Reed switch, 170 and 172...Manual flow path switching valve, 176 and 180
...Opening/closing valve, 182 and 184...pressing piece.

Claims (1)

[Scope of Claims] 1. A support body installed below the vehicle body, a working blade attached to the support body, a link mechanism for attaching the support body to the vehicle body, and the support body. a lifting hydraulic cylinder mechanism for raising and lowering the work blade, and the working blade has a right blade and a left blade, and inner ends of the right blade and the left blade are respectively connected to the front end of the support. The right blade and the left blade are connected to each other so as to be freely pivotable in the front and rear directions about a pivot axis extending in the vertical direction, and an angle hydraulic cylinder mechanism is interposed between the right blade, the left blade, and the support body, respectively. A road shaping device characterized by: 2. The road surface shaping device according to claim 1, wherein the turning center axes of the right blade and the left blade are arranged near the center of gravity of the vehicle body. 3. The support body has a substantially triangular shape, and the inner end portions of the right blade and the left blade are connected to the front end of the support body at a substantially central portion in the width direction so as to be pivotable in the front-rear direction. The road surface shaping device according to scope 1. 4. The link mechanism includes a front link means and a pair of rear link means arranged at intervals in the lateral direction of the vehicle body, and one end of the front link means is pivotably attached to the front part of the support body. and the other end is pivotally connected to the vehicle body, and
One end of the pair of rear link means is respectively pivotally connected to the rear part of the support, and the other end of the pair of rear link means is rotatably connected to the axle housing of the vehicle body. A road shaping device according to claim 1, which is connected to a road shaping device. 5 A support installed below the vehicle body, a working blade attached to the support, a link mechanism for attaching the support to the vehicle body, and a mechanism for moving the support up and down. a hydraulic cylinder mechanism for lifting and lowering, the working blade having a right blade and a left blade, the inner ends of the right blade and the left blade respectively having a pivot extending in the vertical direction at the front end of the support body; A fluid pressure cylinder mechanism for the right angle and a fluid pressure cylinder mechanism for the left angle are connected between the right blade, the left blade, and the support body so as to be freely pivotable in the front and rear directions about the central axis. A cylinder mechanism is interposed therebetween, and the vehicle body includes a front part to which the front wheels are attached and a rear part to which the rear wheels are attached, and the front part and the rear part are connected to a turning center extending in the vertical direction. The support body is connected to the rear side of the vehicle via the link mechanism, and the working blade is disposed between the front wheel and the rear wheel. A right detection means for detecting proximity or contact between the two is provided between the right blade, and a right detection means is provided between the front part of the vehicle and the left blade.
A left detection means for detecting proximity or contact between the two is provided, and the right angle fluid pressure cylinder mechanism is controlled to expand and contract by a right electromagnetic flow path switching valve that switches the flow path, and the left angle fluid pressure cylinder mechanism is expanded and contracted by a left electromagnetic flow switching valve that switches the flow path, and when the right detection means generates a detection signal, the right electromagnetic flow switching valve is energized, thereby causing the right angle fluid to flow. When the pressure cylinder mechanism is contracted and the right blade is rotated rearward, and the left detection means generates a detection signal, the left electromagnetic flow path switching valve is energized, thereby causing the left angle fluid to A road shaping device configured such that a pressure cylinder mechanism is contracted to cause the left blade to pivot rearward. 6. The road surface shaping device according to claim 5, wherein the right detection means and the left detection means each include a permanent magnet and a reed switch that detects the permanent magnet. 7 A support installed below the vehicle body, a working blade attached to the support, a link mechanism for attaching the support to the vehicle body, and a mechanism for moving the support up and down. a hydraulic cylinder mechanism for lifting and lowering, the working blade having a right blade and a left blade, the inner ends of the right blade and the left blade respectively having a pivot extending in the vertical direction at the front end of the support body; A fluid pressure cylinder mechanism for the right angle and a fluid pressure cylinder mechanism for the left angle are connected between the right blade, the left blade, and the support body so as to be freely pivotable in the front and rear directions about the central axis. A cylinder mechanism is interposed therebetween, and the vehicle body includes a front part to which the front wheels are attached and a rear part to which the rear wheels are attached, and the front part and the rear part are connected to a turning center extending in the vertical direction. The support body is connected to the rear side of the vehicle via the link mechanism, and the working blade is disposed between the front wheel and the rear wheel. A right detection means is provided between the right blade and the left blade to detect proximity or contact between the two, and a left detection means is provided between the vehicle front and the left blade to detect proximity or contact between the two. A detection means is provided, and the right angle fluid pressure cylinder mechanism is controlled to expand and contract by a right electromagnetic flow switching valve that switches the flow path, and the right electromagnetic flow switching valve is operated by two right switching switches. The left angle fluid pressure cylinder mechanism is controlled to expand and contract by a left electromagnetic flow switching valve that switches the flow path, and the left electromagnetic flow switching valve is operated and controlled by two left switching switches. The detection means includes one of the right selector switches, and when the front portion of the vehicle and the right blade approach or come into contact, the one of the right selector switches is operated to energize the right electromagnetic flow path selector valve; As a result, the right angle hydraulic cylinder mechanism is contracted and the right blade is rotated rearward, and the left detection means includes one of the left changeover switches, and the left detection means includes one of the left changeover switches, and the left angle detection means includes one of the left changeover switches, When they approach or come into contact with each other, one of the left selector switches is activated to energize the left electromagnetic flow path selector valve, which causes the left angle fluid pressure cylinder mechanism to contract and close the left blade. is turned rearward and one of the right selector switches is operating, even if the other right selector switch is operated to extend the right angle hydraulic cylinder mechanism, the right To prevent the electromagnetic flow switching valve from being energized,
The other of the right changeover switches is connected to the one of the right changeover switches, and when the one of the left changeover switches is in the switching operation, the other of the right changeover switches is connected to the left to extend the left angle hydraulic cylinder mechanism. The other of the left switching switches is connected to the one of the left switching switches so that the left electromagnetic flow path switching valve is not energized even if the other switching switch is operated. 8. The right detecting means and the left detecting means are each composed of a permanent magnet and a reed switch that detects the permanent magnet, and the one of the right changeover switch and the one of the left changeover switch are respectively configured of the reed. The road surface shaping device according to claim 7, which comprises a switch. 9 A support installed below the vehicle body, a working blade attached to the support, a link mechanism for attaching the support to the vehicle body, and a mechanism for moving the support up and down. a hydraulic cylinder mechanism for lifting and lowering, the working blade having a right blade and a left blade, the inner ends of the right blade and the left blade respectively having a pivot extending in the vertical direction at the front end of the support body; A fluid pressure cylinder mechanism for the right angle and a fluid pressure cylinder mechanism for the left angle are connected between the right blade, the left blade, and the support body so as to be freely pivotable in the front and rear directions about the central axis. A cylinder mechanism is interposed therebetween, and the vehicle body includes a front part to which the front wheels are attached and a rear part to which the rear wheels are attached, and the front part and the rear part are connected to a turning center extending in the vertical direction. The support body is connected to the rear side of the vehicle via the link mechanism, and the working blade is disposed between the front wheel and the rear wheel. A right detection means is provided between the right blade and the left blade to detect proximity or contact between the two, and a left detection means is provided between the vehicle front and the left blade to detect proximity or contact between the two. A detection means is provided, and a right electromagnetic on-off valve is provided between the fluid reservoir and the flow path communicating with the contraction side of the right-angle fluid pressure cylinder mechanism, and a right-hand electromagnetic on-off valve is provided to detect contraction of the left-angle fluid pressure cylinder mechanism. A left electromagnetic on-off valve is provided between the flow path communicating with the side and the fluid reservoir, and when the right detection means generates a detection signal, the right electromagnetic on-off valve opens, thereby causing the right angle fluid to flow. When the pressure cylinder mechanism contracts and causes the right blade to pivot backward, and the left detection means generates a detection signal, the left electromagnetic on-off valve opens, thereby causing the left angle fluid pressure cylinder mechanism to open. A road shaping device in which the left blade is caused to pivot rearward when contracted. 10 The right detection means and the left detection means each include:
The road surface shaping device according to claim 9, comprising a permanent magnet and a reed switch for detecting the permanent magnet. 11 A support installed below the vehicle body, a working blade attached to the support, a link mechanism for attaching the support to the vehicle body, and a mechanism for moving the support up and down. a hydraulic cylinder mechanism for lifting and lowering, the working blade having a right blade and a left blade, the inner ends of the right blade and the left blade respectively having a pivot extending in the vertical direction at the front end of the support body; A fluid pressure cylinder mechanism for the right angle and a fluid pressure cylinder mechanism for the left angle are connected between the right blade, the left blade, and the support body so as to be freely pivotable in the front and rear directions about the central axis. A cylinder mechanism is interposed therebetween, and the vehicle body includes a front part to which the front wheels are attached and a rear part to which the rear wheels are attached, and the front part and the rear part are connected to a turning center extending in the vertical direction. the support body is attached to the rear side of the vehicle via the link mechanism, the working blade is disposed between the front wheel and the rear wheel, and the right angle fluid A right opening/closing valve is provided between the flow path communicating with the contraction side of the pressure cylinder mechanism and the fluid reservoir, and a right opening/closing valve is provided between the flow path communicating with the contraction side of the left angle fluid pressure cylinder mechanism and the fluid reservoir. is provided with a left opening/closing valve, and when the front part of the vehicle approaches or contacts the right blade, the front part of the vehicle acts on and opens the right opening/closing valve, thereby opening the right angle hydraulic cylinder. When the mechanism retracts and the right blade turns rearward, and the front of the vehicle approaches or contacts the left blade, the front of the vehicle acts on the left opening/closing valve to open it. The left angle hydraulic cylinder mechanism is then contracted to cause the left blade to pivot rearward.