JPH0735276U - Traveling equipment for asphalt paving vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the smoothness of the pavement finished surface and the traction force of an asphalt pavement vehicle in which a leveling device is towed behind the traveling machine body. [Structure] The traveling wheels of the traveling vehicle body 1 are composed of a pair of left and right first front wheels 6, a pair of left and right second front wheels 7, and a pair of left and right rear wheels 8 for convenience, and all of these six wheels are drive wheels. ,
A pair of left and right traveling frames 10 facing in the front-rear direction has a substantially central portion in the front-rear direction supported by a body frame so as to be vertically swingable, and the front and rear end portions of the traveling frame respectively support the first and second front wheels. Traveling equipment for asphalt paving vehicles.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a traveling device for an asphalt paving vehicle such as an asphalt finisher, a remixer, and a repaver.

[0002]

[Problems to be Solved by Prior Art and Invention]

 Generally, some asphalt paving vehicles have a leveling device for spreading the asphalt mixed material behind the traveling machine body, such as an asphalt finisher. It is configured to be pulled by the traveling machine body through a leveling arm whose base end is supported by the machine body frame of the traveling machine body.

By the way, in such a vehicle, traveling wheels (driving wheels) for forming a traveling device are provided. Conventionally, the traveling wheels are composed of a pair of left and right front wheels and a pair of left and right rear wheels. The base end of the leveling arm was supported at the intermediate portion between the front wheel and the rear wheel. For this reason, when there is unevenness on the road surface for paving work, the pivot that pivotally supports the base end of the leveling arm moves up and down as the front wheel rides on the uneven surface, which causes the leveling device to move. There is a problem that a smooth pavement surface cannot be obtained because the working angle changes and the pavement thickness changes. Moreover, the weight of the hopper filled with the asphalt mixed material is applied to the front wheels, but the pair of left and right front wheels alone is not acceptable as the traction force is large, and the tire load is large. However, there are also problems such as the front wheels sinking into the ground, which significantly reduces the efficiency of paving work.

[0004]

[Means for Solving the Problems]

 The present invention was devised with the object of providing a traveling device for an asphalt pavement vehicle that can eliminate these drawbacks in view of the above-mentioned circumstances. In an asphalt paving vehicle in which an asphalt mixture material is spread and the towing equipment is towed, the traveling wheels are composed of a pair of left and right first front wheels, a pair of left and right second front wheels, and a pair of left and right rear wheels. Conveniently, it consists of six wheels, and all of these six wheels are drive wheels connected to the power transmission mechanism, and when supporting the first and second front wheels on the machine frame of the traveling machine, the front and rear directions are set on the machine frame. It is characterized in that a pair of facing left and right traveling frames are rotatably supported at a substantially central portion in the front-rear direction, and first and second front wheels are respectively supported at both front and rear ends of the traveling frame.

Further, the present invention relates to an asphalt paving vehicle in which a spreading device for spreading the asphalt mixed material is spread behind a traveling machine body having a pair of right and left crawler type traveling bodies, The drive wheels of the traveling body are composed of a pair of left and right first front wheels, a pair of left and right second front wheels, and a pair of left and right rear wheels for convenience, and the first and second front wheels of these six wheels are In supporting the pedestal on the gantry, the gantry of the traveling body supports a pair of left and right traveling frames, which are oriented in the anteroposterior direction, in a substantially central portion in the front-rear direction in a vertically swingable manner. It is characterized by supporting the two front wheels respectively.

Further, the present invention relates to an asphalt pavement vehicle in which an asphalt mixing material is spread behind a traveling machine body, and a spreading device is towed on the traveling machine body. It is composed of a traveling body and a pair of left and right rear wheels on the rear side, and the rear wheel is used as a driving wheel, and the driving wheels of the crawler type traveling body are composed of a pair of left and right first front wheels and a pair of left and right second wheels. In order to support the first and second front wheels on the pedestal of the traveling body, the front and rear wheels are generally supported by the pedestal of the traveling body. The first and second front wheels are respectively supported on both front and rear ends of the traveling frame so as to be swingable up and down.

[0007] The present invention is capable of effectively absorbing the unevenness of the road surface to be paved and exerting a reliable traction force by this configuration, and further, the weight of the popper filled with the asphalt mixture is mainly determined. By reducing the surface pressure applied to the roadbed of the front wheels received by the vehicle, the phenomenon of sinking into the road surface is eliminated.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of an asphalt finisher. The traveling machine body 1 includes a hopper 2 for receiving an asphalt mixture material, a bar feeder (not shown) for sending the asphalt mixture material received by the hopper 2 backward, It is composed of various components such as a screw spreader 3 that spreads the asphalt mixed material sent from the bar feeder evenly on the paved surface. Furthermore, it is spread on the paved surface behind the traveling machine body 1. Conventionally, a screed device (corresponding to the spreading and leveling device of the present invention) 4 for compacting the asphalt mixed material and laying the pavement surface evenly is pulled through the leveling arm 5. is there.

The traveling wheels of the traveling vehicle body 1 include a pair of left and right first front wheels 6, a pair of left and right second front wheels 7 arranged behind the first front wheels 6, and a pair of left and right rear wheels 8. It consists of six wheels, but the four wheels of the first and second front wheels 6 and 7 are set as steering wheels, and all of these six wheels 6, 7, and 8 are set as drive wheels. Here, the rear wheel 8 is rotatably supported by the rear portion of the machine body frame 1a of the traveling machine body 1, and has various power transmission mechanisms such as a transmission chain, a transmission gear, a transmission shaft, and a differential gear (none of which are shown). In an intervening state, it is interlocked with a rear wheel drive hydraulic motor (none of which is shown) that is driven based on hydraulic pressure supplied from a hydraulic pump whose power source is an engine mounted on the traveling machine body 1, The rear wheels 8 are driven to rotate based on the drive of the hydraulic motor.

On the other hand, 9 is a left-right supporting shaft that is penetratingly supported by the front part of the machine body frame 1 a, and the left and right ends of the supporting shaft 9 are substantially centered in the front-back direction of the traveling frame 10 that faces the front-back direction. Each part is supported so that it can swing up and down. At the front end of the traveling frame 10, a first front wheel bracket 11 that pivotally supports the first front wheel 6 is pivotally supported around a first vertical axis 12, and the rear end of the traveling frame 10 is also supported. A second front wheel bracket 13 on which the second front wheel 7 is rotatably supported is swingably supported on the second vertical axis 14. In the figure, reference numeral 15 is a hydraulic cylinder for opening and closing the hopper 3. The base end of the hydraulic cylinder 15 is attached to the support shaft 9 portion of the traveling frame 10, and the traveling frame 10 is supported by the support shaft. It is designed so that the hydraulic cylinder 15 is not affected when it swings up and down about the fulcrum 9.

An operating arm 13a is provided on the rear portion of the second front wheel bracket 13 so as to project rearward in a slanting manner. The distal ends of the operating arms 13a of the left and right second front wheel brackets 13 are The first steering link 16 facing the left-right direction is swingably connected to both left and right ends. The first steering link 16 is connected to a piston rod 17a of a steering hydraulic cylinder 17 via a bracket 16a, and the first steering link 16 is expanded and contracted based on the expansion and contraction operation of the steering hydraulic cylinder 17. In the embodiment, as shown in FIG. 2, when the steering cylinder 17 is extended, the first steering link 16 is moved leftward. When the size is reduced, the first steering link 16 is set to move to the right. As the first steering link 16 moves left and right, the left and right second front wheel brackets 13 integrally swing left and right with the vertical axis 14 as a spindle.

Further, the second front wheel bracket 13 is provided with a second swing arm 13b projecting in an inclined shape toward the front so as to branch from the operating arm 13a. The front wheel bracket 11 is provided with a first swing arm 11a protruding in a curved shape toward the rear. The tip ends of the first and second swing arms 11a and 13b are swingably connected to the front and rear end portions of a second steering link 18 which faces the front and rear direction, respectively. When the second front wheel bracket 13 swings left and right with the second vertical axis 14 as the support axis as the link 16 moves left and right, the first front wheel bracket 11 also uses the first vertical axis 12 as the support axis in conjunction with this. It is set so as to swing left and right in the same direction as the second front wheel bracket 13. Here, the distance L ₁ from the axial center position of the first vertical axis 12 to the connecting position of the second steering link 18 of the first swing arm 11a is calculated from the axial center position of the second vertical axis 14 to the second swing arm. It is set to be shorter than the distance L ₂ to the connection position of the second steering link 18 of 13b, and as described above, when the first and second front wheel brackets 11 and 13 oscillate sideways. In addition, the left / right swing angle (steering angle) of the first front wheels 6 accompanying this is larger than the left / right swing angle (steering angle) of the second front wheels 7.

Reference numeral 19 denotes a first front wheel drive hydraulic motor provided on the first front wheel bracket 11, and 20 denotes a second front wheel drive hydraulic motor provided on the second front wheel bracket 13. Numerals 19 and 20 are driven based on pressure oil supply from a hydraulic pump (not shown) whose power source is an engine, and the first and second front wheels 6 are driven based on the driving of the hydraulic motors 19 and 20. , 7 are driven and rotated.

On the other hand, the screed device 4 is pulled by the traveling machine body 1 via the leveling arm 5 as described above. The base end portion of the leveling arm 5 is substantially the central portion in the left-right direction of the machine body frame 1 a. It is pivotally supported by a pivot 21 which is vertically movably supported by. Reference numeral 22 denotes a pivot hydraulic cylinder connected to the pivot 21, and the pivot hydraulic cylinder 22 can be expanded and contracted to move the pivot 21 up and down. The angle (angle between the lower surface of the screed plate 23 and the pavement surface) can be changed. In addition, a pavement thickness adjusting tool (thickness control tool) 24 is provided between the rear part of the leveling arm 5 and the front part of the screed device 4 to change the working angle of the scoring device 4. It is possible to adjust the pavement thickness by providing a lifting cylinder 25 between the traveling machine body 1 and the screed device 4 to lift the screed device 4 upward from the working position in contact with the pavement surface. The screed device 4 is set so as not to come into contact with the ground during transfer.

In the embodiment of the present invention configured as described above, the asphalt mixed material received by the hopper 2 is sent to the rear by the bar feeder, spread by the screw spreader 3 on the paved surface, and further screeded by the screed device. In this case, the pivot 21 that pivotally supports the base end of the leveling arm 5 that pulls the screed device 4 does not move up and down, and the pavement finish surface is smooth. can do.

In other words, the traveling wheels of the traveling vehicle body 1 are composed of the first and second front wheels 6 and 7 and the rear wheels 8, of which the first and second front wheels 6 and 7 are in the front-rear direction. The substantially central portion is supported by the front and rear end portions of the traveling frame 10 which is pivotally supported on the body frame 1a side in a vertically swingable manner. Therefore, when there is unevenness on the road surface where the paving work is performed and the front wheels run on the uneven surface, the first and second front wheels 6 and 7 move up and down in opposite directions about the support shaft 9 as an axis. By absorbing the unevenness of the front wheel 6, the vertical movement of the pivot 21 located behind the front wheels 6 and 7 can be made as small as possible. As a result, inadvertent vertical movement of the leveling arm 5 due to the unevenness of the work road surface can be eliminated, the working angle of the screed device 4 can be kept constant, and smoothness with almost no unevenness will appear. It can be a pavement finish.

Moreover, the first and second front wheel brackets 11, 13 bearing the first and second front wheels 6, 7 are swingable around the traveling frame 10 about the first and second vertical axes 12, 14, respectively. The first swing arm 11a, which is supported on the first bracket 11 and is projected on the first bracket 11, and the second swing arm 13b, which is projected on the second bracket 13, are connected to each other via the second steering link 18. Distance L from the axis of the vertical shaft 12 to the connecting position of the second steering link 18 of the first swing arm 11a ₁ Is the distance L from the axis of the second vertical axis 14 to the connecting position of the second steering link 18 of the second swing arm 13b.₂The steering angle of the first front wheels 6 becomes larger than the steering angle of the second front wheels 7 by being set shorter than that. Therefore, when the four steering wheels, the first and second front wheels 6 and 7, are steered wheels, the steering angle of the first front wheel 6 becomes large as much as the steering angle is arranged in the front, and there is no bearing and there is no support. The steering operation can be performed.

Further, in this case, since all the six wheels including the first and second front wheels 6 and 7 and the rear wheel 8 are drive wheels, even on the front wheel side which receives the weight of the hopper 2 filled with the asphalt mixture. Sufficient towing drive force can be exerted, and strong and reliable towing work can be performed, and even on a fragile road surface, sinking of the front wheels can be effectively avoided and stable work running can be performed. It will be.

The present invention is not limited to the above-mentioned first embodiment, but can be carried out when the traveling body of the asphalt paving vehicle is of the crawler type, but in this case As in the second embodiment shown in FIG. 4, the drive wheels of the crawler-type traveling body 26 are composed of a pair of left and right first front wheels 27, a pair of left and right second front wheels 28, and a pair of left and right rear wheels 29 for convenience. In addition, a pair of left and right traveling frames 30 facing the front-rear direction are supported on the pedestal of the traveling body 26 so as to be swingable up and down, and the front and rear end portions of the traveling frame 30 have the first, The second front wheels 27, 28 may be supported respectively. Also in this case, as in the case of the first embodiment, the first and second front wheels 27, 28 move up and down in opposite directions to absorb the unevenness of the road surface, and the smoothness is achieved. As a result, it is possible to obtain a perfect pavement finish and to exert a reliable traction force.

Further, as in the third embodiment shown in FIG. 5, the traveling body of the asphalt pavement vehicle is composed of a pair of left and right front crawler type traveling bodies 31 and a pair of rear left and right rear wheels 32. The rear wheels 32 are used as driving wheels, and the driving wheels of the crawler-type traveling body 31 are composed of a pair of left and right first front wheels 33 and a pair of left and right second front wheels 34. A pair of left and right traveling frames 35 facing in the front-rear direction support a substantially central portion in the front-rear direction swingably up and down, and support the first and second front wheels 33, 34 at both front and rear ends of the traveling frame 35, respectively. Alternatively, even in this case, the same operational effect as the first and second embodiments can be obtained. By the way, in the second and third embodiments, a crawler type vehicle is used as the traveling body of the asphalt pavement vehicle, but the steering mechanism in this case is performed by the speed difference between the left and right crawler.

[0021]

[Operation effect]

 In short, since the present invention is configured as described above, the paving road surface leveling work is performed by the leveling device towed behind the traveling machine body.In this case, Since the pair of left and right first, second front and rear wheels are all driving wheels, sufficient traction driving force can be exerted not only on the rear wheels but also on the front wheels, and powerful and reliable towing. In addition to the work being performed, the sinking of the front wheels can be effectively avoided even on a fragile road surface, and stable work traveling can be performed. Moreover, the first and second front wheels are supported by the front and rear ends of the traveling frame, which has a substantially central portion in the front-rear direction that is swingably movable up and down. Therefore, the road surface on which the paving work is performed has unevenness. When the front wheels ride on the uneven surface, the first and second front wheels move up and down in opposite directions to absorb the unevenness of the road surface. As a result, it is possible to eliminate inadvertent vertical movement due to the unevenness of the work road surface, and it is possible to create a smooth pavement finish surface with almost no unevenness.

[Brief description of drawings]

FIG. 1 is a side view of an asphalt finisher.

FIG. 2 is a plan view of a front wheel portion.

FIG. 3 is a rear view of a second front wheel portion.

FIG. 4 is a schematic view of a traveling machine body showing a second embodiment.

FIG. 5 is a schematic view of a traveling machine body showing a third embodiment.

[Explanation of symbols]

 1 traveling machine body 4 screed device 6 first front wheel 7 second front wheel 8 rear wheel 10 traveling frame 11 first front wheel bracket 11a first swing arm 12 first vertical axis 13 second front wheel bracket 13b second swing arm 14 second Vertical axis 18 Second steering link 26 Crawler-type traveling body 27 First front wheel 28 Second front wheel 29 Rear wheel 30 Travel frame 31 Crawler-type traveling body 32 Rear wheel 33 First front wheel 34 Second front wheel 35 Travel frame

Claims (4)

[Scope of utility model registration request] 1. An asphalt pavement vehicle in which an asphalt leveling device that spreads and spreads asphalt mixed material is pulled behind a traveling machine body having traveling wheels, wherein the traveling wheels include a pair of left and right first front wheels and a pair of left and right front wheels. It is composed of a pair of second front wheels and a pair of left and right rear wheels for convenience, and all of these six wheels are drive wheels connected to a power transmission mechanism, and the first and second front wheels are body frames of a traveling body. In support of the vehicle body frame, a pair of left and right traveling frames facing in the longitudinal direction are supported in a substantially central portion in the front-rear direction in a vertically swingable manner, and first and second front wheels are respectively attached to both front and rear ends of the traveling frame. A traveling device for an asphalt paving vehicle characterized by being supported. 2. The support of the first and second front wheels to the traveling frame according to claim 1, wherein the first and second front wheel brackets on which the respective front wheels are supported are swingable around the longitudinal axis on the traveling frame. The first and second front wheels are steered by connecting the swinging arms that project from the first and second front wheel brackets to the front and rear ends of the steering link in a swingable manner. Are arranged so as to be in the same direction via the steering link, and the distance from the longitudinal axis of each of the swing arms to the steering link connection position is such that the front first front wheel is closer to the rear side. A traveling device for an asphalt paving vehicle, which is set to be shorter than the two front wheels. 3. An asphalt paving vehicle in which a spreading device for spreading an asphalt mixture material is spread behind a traveling machine body having a pair of left and right crawler type traveling bodies,
The driving wheels of the crawler type traveling body are composed of six left and right first front wheels, a pair of left and right second front wheels and a pair of left and right rear wheels for convenience, and the first and second front wheels of these six wheels are run. In supporting the body of the traveling body, the pair of left and right traveling frames facing the front-rear direction is supported by the traveling body's pedestal so that the substantially central portion in the front-rear direction can swing up and down. A traveling device for an asphalt pavement vehicle characterized by supporting second front wheels respectively. 4. An asphalt pavement vehicle in which an asphalt leveling device that spreads and spreads asphalt mixed material is pulled behind the traveling machine body, wherein the traveling body of the traveling machine body is a pair of left and right front crawler type traveling bodies. A pair of left and right rear wheels on the rear side, the rear wheel serving as a driving wheel, and the driving wheels of the crawler type traveling body including a pair of left and right first front wheels and a pair of left and right second front wheels. Further, when supporting these first and second front wheels on the platform of the traveling body, a pair of left and right traveling frames facing the longitudinal direction are supported on the platform of the traveling body so as to be swingable up and down. A traveling device for an asphalt paving vehicle, characterized in that first and second front wheels are respectively supported at both front and rear ends of the traveling frame.