JPH072511U - Suspension system for paved vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] Smoothly insert the paving material into the hopper. [Structure] Hydraulic cylinders 9 are attached to both sides of a vehicle body 3 provided with a hopper 2. An axle 10 is provided on the piston rod 9a of the hydraulic cylinder 9, and the axle 10 supports the front wheel 4. The hydraulic cylinders 9, 9 are connected to each other by a communication pipe 16, and the piping 15 of the hydraulic pump 12 is connected to the communication pipe 16. The pipe 15 is provided with a switching valve 13 and a shutoff valve 14. The switching valve 13 is switched to the oil tank 17 and the shutoff valve 14
When is opened, the hydraulic oil of the hydraulic cylinder 9 flows into the oil tank 17, and the hopper 2 descends together with the vehicle body 3. Hydraulic pump 1
When 2 is operated to switch the switching valve 13 to the hydraulic pump 12, the hydraulic cylinder 9 extends to raise the hopper 2. In the state where the shutoff valve 14 is closed, the working oil flows back and forth between the hydraulic cylinders 9, 9 through the communication pipe 16, so that the equalizer function is generated and the vehicle body 3 is kept horizontal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a suspension system for a paving vehicle including a hopper for paving material.

[0002]

[Prior art]

 The suspension system of a conventional paving vehicle such as an asphalt finisher or a base paver, which has a hopper for paving material such as asphalt mixture on the vehicle body, attaches the axle to the vehicle body directly or via a spring and attaches the wheels to the axle. It is said to be attached structure.

[0003]

[Problems to be solved by the device]

 With the structure of the conventional suspension system, as shown in FIG. 4, when the dump truck 21 is moved backward to approach the paving vehicle 1 and the loading platform 22 is tilted to supply the paving material A to the hopper 2, the dump truck 21 If the ground clearance H of the rush prevention device 23 provided at the rear portion is lower than the ground clearance Ha of the hopper 2, the paving material A cannot be put into the hopper 2. The rush prevention device 23 prevents other vehicles from rushing under the platform 22 of the dump truck 21 due to a rear-end collision, and its equipment is obligatory.

By the way, the ground clearance H of the rush prevention device 23 in an empty state has been set to 700 mm or less by the safety standards of road transportation vehicles, but has been revised to 550 mm or less (November 16, 1991). Issued daily, effective June 1, 1992). When the paving material A is loaded on the loading platform 22 of the dump truck 21, the ground clearance H of the plunge prevention device 23 is about 500 mm, which causes the above-mentioned harmful effects. The ground clearance Ha of the hopper 2 subtly affects the functions of the bar feeder for transferring the paving material A to the rear, the spreading screw for spreading the paving material A to the left or the right, or the leveling device for the paving material A. Only the height of the hopper 2 cannot be simply lowered in accordance with the ground clearance H of the rush prevention device 23 of the revised security standard, and a major design change is required.

An object of the present invention is to provide a suspension device for a vehicle that can arbitrarily change the ground clearance of a hopper according to the ground clearance of a rush prevention device for a dump truck.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an up-and-down mechanism provided on both sides of a vehicle body provided with a hopper for paving material, wheels individually supported by the up-and-down members of the up-and-down mechanism, and It is configured to include a drive device that moves the vehicle body up and down by operating the up-down mechanism.

[0007]

[Action]

 If the ground clearance of the dump truck rush prevention device is lower than the ground clearance of the hopper, the drive mechanism activates the vertical mechanism to lower the vehicle body and lower the ground clearance of the hopper. After receiving the supply of paving material from the dump truck, if necessary, the ground clearance of the hopper will be returned to the original level and the paving work will be continued.

[0008]

【Example】

 1 to 3 show an embodiment of the present invention. The hopper 2 of the paved vehicle (asphalt finisher) 1 is provided at the front end portion (left side in FIG. 1) of the vehicle body 3. Front wheels (steering wheels) 4 and 4 are provided on the left and right sides of the front end of the vehicle body 3, and rear wheels 5 and 5 are provided on the left and right sides of the rear end. A bar feeder (not shown) for transferring the paving material in the hopper 2 to the rear is provided on the vehicle body 3, and the paving material transferred by the bar feeder to the rear of the vehicle body 3 is provided. A spreading screw 6 that receives and spreads to the left and right and a screed 7 that spreads and spreads the paving material spread by the spreading screw 6 are provided. Reference numeral 8 is a driver's seat, and the basic structure of the asphalt finisher 1 is well known.

The front wheels 4, 4 are individually supported by the axles 10, 10 attached to the piston rods (upper and lower members) 9a, 9a of the hydraulic cylinders (up / down mechanism) 9, 9 respectively. 9 is fixed to the vehicle body 3. The lower portions of the piston rods 9a, 9a are vertically inserted into bearings 11, 11 provided on the vehicle body 3, respectively. Therefore, when the hydraulic cylinders 9 and 9 are operated to extend the piston rods 9a and 9a, the vehicle body 3 rises, and when the piston rods 9a and 9a are contracted, the vehicle body 3 descends.

Reference numeral 12 is a hydraulic pump (driving device). The hydraulic pump 12 operates the hydraulic cylinders 9 and 9, and is connected to the hydraulic cylinders 9 and 9 through a pipe 15 provided with a switching valve 13 and a shutoff valve 14 and a communication pipe 16. The communication pipe 16 connects the pair of hydraulic cylinders 9, 9 to each other. The switching valve 13 switches the hydraulic oil of the hydraulic pump 12 to the hydraulic cylinders 9 and 9 and the oil tank 17, and is provided on the hydraulic pump 12 side of the pipe 15. The shutoff valve 14 opens and closes the pipe 15, and is provided on the communication pipe 16 side of the pipe 15.

Next, the operation of the suspension device for a paved vehicle according to the present invention constructed as described above will be described. The ground clearance H of the entry prevention device 23 of the dump truck 21 (FIG. 4) carrying the pavement material A is close to the ground clearance Ha of the hopper 2, or is lower than the ground clearance Ha of the hopper 2 and the pavement material A is hoppered. When it is not possible to supply the oil smoothly to No. 2, the switching valve 13 is switched to connect the pipe 15 to the oil tank 17, and then the shutoff valve 14 is opened. By this operation, the hydraulic oil in each hydraulic cylinder 9, 9 flows freely into the oil tank 17 through the communication pipe 16 and the pipe 15, so that the vehicle body 3 descends by its own weight together with the hopper 2. Lower the ground clearance Ha. Therefore, the shutoff valve 14 is closed and the paver material is put into the hopper 2.

When the vehicle body 3 is lifted from the above state to return the hopper 2 to the original height, the switching valve 13 is switched to the hydraulic cylinders 9 and 9 side, the hydraulic pump 12 is operated, and the shutoff valve 14 is turned on. open. As a result, the hydraulic cylinders 9, 9 extend to raise the hopper 2 together with the vehicle body 3. When the hopper 2 reaches the original height, the shutoff valve 14 is closed to switch the switching valve 13 to the oil tank 17 side, and the hydraulic pump 12 is stopped.

Since the communication pipe 16 connects the pair of hydraulic cylinders 9 and 9 to each other to allow the flow of hydraulic oil to be free, when one of the front wheels 4 is recessed in the road surface while the shutoff valve 14 is closed. When it moves to the position where it floats in the air for a moment, hydraulic oil is immediately sent to the hydraulic cylinder of the front wheel 4 from the hydraulic cylinder 9 of the other front wheel 4 through the communication pipe 16. As a result, an equalizer function is generated and the vehicle body 3 is kept horizontal.

In the above embodiment, the pair of left and right hydraulic cylinders 9 and 9 are simultaneously moved by one hydraulic pump 12, but the hydraulic pumps 12 are connected to the hydraulic cylinders 9 and 9, respectively. It is also possible to operate each hydraulic cylinder 9, 9 separately. Further, although the hydraulic cylinder 12 is used as the up-and-down mechanism, for example, another up-and-down mechanism that combines a screw and a nut can be used. Separately from the shutoff valve 14 of the pipe 15, if a shutoff valve dedicated to each hydraulic cylinder 9, 9 is provided in the communication pipe 16, the height of the pair of left and right front wheels 4, 4 with respect to the horizontal plane may be mutually changed as necessary. It can be different.

[0015]

[Effect of device]

 As described above, the suspension device for a paved vehicle according to the present invention is individually supported by the vertical mechanism provided on both sides of the vehicle body provided with the hopper for the paving material and the upper and lower members of the vertical mechanism, respectively. It is equipped with wheels and a drive device that moves the vehicle body up and down by operating the up-down mechanism, so when the ground clearance of the rush prevention device of a dump truck carrying pavement material is low. However, the ground clearance of the hopper of the paved vehicle can be lowered and the paving material can be smoothly received by the hopper without any trouble.

Further, since the hopper lowered when the paving material is replenished can be immediately raised to the original state, the paving function of the paved vehicle is not impaired and the paving can be continued smoothly. Moreover, existing paved vehicles can be modified relatively easily, which is extremely practical.

[Brief description of drawings]

FIG. 1 is a side view of an asphalt finisher embodying the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a block diagram showing an embodiment of the present invention.

FIG. 4 is a side view showing a relationship between a hopper of a paved vehicle and a rush prevention device of a dump truck.

[Explanation of symbols]

 1 Paved Vehicle 2 Hopper 3 Car Body 4 Front Wheel 9 Hydraulic Cylinder (Up / Down Mechanism) 12 Hydraulic Pump (Drive Device)

Claims (1)

[Scope of utility model registration request] 1. An up-and-down mechanism provided on both sides of a vehicle body having a hopper for paving material, wheels individually supported by up-and-down members of the up-and-down mechanism, and an up-and-down mechanism operated to raise and lower the vehicle body. A suspension device for a paved vehicle, comprising: