JP2001001936A - Running drive for paving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the machine to pass and escape from a slipping position a paving machine which distributingly supplies pressure oil to hydraulic motors driving right and left driving wheels respectively from one hydraulic pump and runs by the rotation of both the driving wheels. SOLUTION: This drive detects, with rotational speed detection sensors 14, 15, the rotational speed of right and left driving wheels 2, 3 for driving a paving machine or the rotational speed of hydraulic motors driving the driving wheels respectively, and determines a relative difference between the rotational speeds. Based on the relative difference, the slipping or idle rotation of one of the driving wheels is determined and pressure oil is supplied to only the hydraulic motor driving the driving wheel on grip side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling drive device for a paving machine, and more particularly, to a civil engineering construction of a paving machine or the like having hydraulic motors respectively mounted on left and right driving wheels so as to travel by driving each motor. The present invention relates to a traveling drive device for a machine.

[0002]

2. Description of the Related Art FIG. 3 shows a hydraulic circuit 1 of a traveling drive device for a paving machine of this kind, such as an asphalt finisher, which drives left and right drive wheels 2 and 3, respectively. Hydraulic motors 4 and 5 are connected in parallel to an oil feed pump (hydraulic pump) 6, and the hydraulic motors 4 and 5 are driven by an engine 7 mounted on an airframe (not shown). By supplying the same amount of pressure oil to the hydraulic motors 4 and 5 at the same time, the left and right drive wheels 2 and 3 are rotated at substantially the same rotation speed and torque to travel. Also,
This kind of paving machine has two driving wheels 2,
Although a differential device for absorbing the rotational speed difference of 3 is also provided, one of the drive wheels sinks on the road surface and slips or slips when the vehicle passes through a soft ground or a ground having an up-and-down change during traveling. In some cases, the load on the driving wheels on the slipping or slipping or slipping side suddenly decreases, and all the pressure oil from the oil feed pump 6 is supplied to the hydraulic motor on the slipping or slipping side. May be.

Therefore, in a paving machine configured to distribute and supply hydraulic oil from one hydraulic pump to hydraulic motors for driving left and right driving wheels, respectively, and to run by rotation of both driving wheels, a paving machine from a slip surface or the like is used. In order to allow passage and escape, technical problems to be solved arise, and the present invention aims to solve these problems.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and supplies hydraulic oil from a single hydraulic pump to hydraulic motors for driving left and right driving wheels, respectively. In a paving machine configured to run by the rotation of wheels, slip detection means for detecting slip or idle rotation of the left and right drive wheels, respectively, and when slip or idle rotation of one of the drive wheels is detected by the slip detection means Provide a traveling drive device for a paving machine configured to supply hydraulic oil only to the hydraulic motor on the grip side, and further supply hydraulic oil to hydraulic motors that respectively drive left and right drive wheels from one hydraulic pump. In a paving machine configured to travel by rotation of both drive wheels, a slip detecting means for detecting slip or idle rotation of the left and right drive wheels, respectively, A paving machine comprising a moving braking means, wherein when one of the driving slips or the idling is detected based on the detection value of the slip detecting means, the braking means brakes the driving wheel on the slip or the idling side. And a traveling drive device for a paving machine, wherein the slip detecting means comprises a rotational speed detecting means for detecting a rotational speed of each of the drive wheels or a hydraulic motor. Things.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a traveling drive device for an asphalt finisher will be described below in detail with reference to the accompanying drawings. The same components as in the related art are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows a hydraulic circuit diagram 11 of a traveling drive device of an asphalt finisher, which is provided with hydraulic motors 4 and 5 for driving a left driving wheel 2 and a right driving wheel 3 respectively. The oil feed pump 6 is driven by the driving force of the engine 7, sucks hydraulic oil stored in a hydraulic tank (not shown), and drives the hydraulic motor 4 driving the left driving wheel 2 and the right driving wheel 3. The hydraulic oil is equally distributed to the hydraulic motor 5 and the hydraulic motors 4 and 5 are driven at substantially the same rotational speed and rotational torque. The pressure oil discharged from each of the hydraulic motors 4 and 5 is configured to be cleaned by a separator or the like and returned to the tank. A hydraulic motor 4 for rotating the left driving wheel 2 and a hydraulic motor 5 for rotating the right driving wheel 3 are connected to the oil pump 6 via a directional control valve 12. It is connected to a controller 13 composed of a computer and a sequencer.

As a slip detecting means for detecting slip or idling, a hydraulic motor 4 for driving the left driving wheel 2 and a hydraulic motor 5 for driving the right driving wheel 3 or the left driving wheel 2 and the right driving wheel 3 are provided. The rotation speed detection sensors 14 and 15 are provided to detect the rotation speeds, respectively, and the respective rotation speed detection sensors 14 and 15 are output to the controller 13.

[0008] The controller 13 is a hydraulic motor 4 for driving the left driving wheel 2 and the right driving wheel 3 or the left driving wheel 2 and a hydraulic pressure for rotating the right driving wheel 3 based on the output values from the rotation speed detection sensors 14 and 15. In addition to detecting the rotational speed of the motor 5, based on the output values of the rotational speed detection sensors 14 and 15, the difference between the relative rotational speeds of the left and right drive wheels 2 and 3 or the drive for driving the left and right drive wheels 2 and 3 The relative rotational speed difference between the hydraulic motors 4 and 5 is calculated, and when the relative rotational speed difference exceeds a predetermined value, it is determined that the vehicle is slipping or idling, and the driving wheel on the high rotational speed side is shifted to the slipping or idle driving wheel. Is determined. The controller 13 outputs a switching signal to the direction control valve 12 when it is determined that the vehicle is slipping or idling, so that the oil passages 16 and 17 for equally distributing the hydraulic pressure to the right driving wheel and the left driving wheel are provided. In addition, the hydraulic motor oil passage for driving the slip- or idle-side drive wheels is shut off, and the oil passage for driving the grip-side drive wheels is communicated with the oil feed pump 6 so that the grip-side drive wheels are connected. It is configured to supply the entire amount of pressure oil to the hydraulic motor to be driven.

For this reason, when one of the driving wheels slips or idles due to the softness of the ground, or when one of the driving wheels fits into a concave portion of the ground and idles to reduce the load rapidly. However, it is possible to keep the speed substantially constant by the inertia of the airframe before the slip or the slip and the driving force of the other drive wheel after the slip or the slip and pass through the ground where the slip or the slip occurs. Therefore, even if one of the driving wheels slips during paving, it is possible to keep the pressing density and the pavement thickness constant during paving, and also, when driving normally, on a soft ground or an uneven road. Even when one of the driving wheels slips or idles and the aircraft stops when the vehicle passes through a rapidly changing ground, the vehicle can easily escape by the driving force of the other driving wheel.

FIG. 2 shows another hydraulic circuit diagram 21 of the traveling drive device of the paving machine according to the present invention.

As shown in FIG. 1, in this embodiment,
The aforementioned directional control valve 12 has been removed from the hydraulic circuit 21, and instead has a braking device 18 for braking the rotation of the hydraulic motors 4, 5 for driving the left driving wheel 2 and the right driving wheel 3, respectively. , 19 are attached. in this case,
As each of the braking devices 18 and 19, a well-known hydraulic braking device such as a disc brake, a drum brake, and a pillow brake is used.

The slip detecting means comprises the above-mentioned rotation speed detection sensors 14, 15, and each of the rotation speed detection sensors 14, 1
5 is connected to the controller 20.

The controller 20 is composed of, for example, a microcomputer and a sequencer. The left driving wheel 2 and the right driving wheel 3 or the hydraulic motor 4 for driving the left driving wheel 2 and the right motor 4 are driven by the output values of the rotation speed detecting sensors 14 and 15. Drive wheel 3
The relative rotational speed difference between the left and right drive wheels 4 and 5 or the relative rotational speed difference between the hydraulic motors 4 and 5 for driving the left and right drive wheels 2 and 3 is calculated based on the rotational speed of the hydraulic motor 5 that rotationally drives the motor. When the relative rotational speed difference exceeds a predetermined value, it is determined that the vehicle is slipping or idling, the driving wheel on the high rotation side is determined as the driving wheel on the slipping or idling side, and the other driving wheel is driven on the grip side. Judge as a ring. Then, when it is considered that the vehicle is slipping or idling, a signal is output only to the braking device that brakes the driving wheels on the slipping or idling side to perform braking.

As a result, the rotational speed of the hydraulic motor for driving the slip-side drive wheel decreases or stops.
Until the rotation amounts of the three become equal, the pressure oil is supplied only to the hydraulic motor on the grip side, and the drive wheels on the grip side rotate at a rotation speed and a rotation torque corresponding to the discharge amount of the pressure oil of the oil supply pump 6. I do. Therefore, it is possible to escape from the place where the slip and slip occur without difficulty. In this case, if the hydraulic motor on the slip side is completely stopped by the braking device and the discharge amount of the pressure oil of the oil feed pump 6 is controlled to the maximum, the soft ground or the ground which slips or idles with the maximum driving force can be obtained. It is possible to escape from soft ground and uneven ground by lowering the number of rotations of the drive wheel on the slip side to a predetermined number of rotations relative to the number of rotations on the grip side. It is.

In one embodiment of the present invention, a traveling drive device of a pavement machine such as an asphalt finisher or a compactor is illustrated as a traveling drive device of a civil engineering construction machine. It is natural that the present invention can be applied to other civil engineering and construction machines to be able to travel on soft ground or rugged ground.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0017]

According to the first aspect of the present invention, as described in detail in the first embodiment, the hydraulic oil is supplied from one hydraulic pump to the hydraulic motors for driving the left and right driving wheels, respectively, so that both driving wheels are driven. In a paving machine configured to run by the rotation of, the slip detection means for detecting the slip or idle running of the left and right drive wheels, respectively, when the slip detection means detects slip or idle of one of the drive wheels, Since the configuration is such that the hydraulic oil is supplied to the hydraulic motor on the grip side, it is possible to easily pass through and escape from the place where the slip and slip occur. In addition, the invention has a very great effect, for example, it can be provided at a low price because the configuration is simple.

According to a second aspect of the present invention, in the paving machine, one hydraulic pump supplies pressure oil to hydraulic motors for driving left and right drive wheels, respectively, so that the vehicle travels by rotation of both drive wheels. The paving machine thus configured includes: a slip detecting unit that detects slip or idle running of the left and right driving wheels; and a braking unit that brakes the left and right driving wheels, respectively, based on a detection value of the slip detecting unit. When the driving slip or idling is detected, the braking means brakes the driving wheel on the slip or idling side, so that the vehicle easily passes from the place where the idling or slip occurs as in the invention of claim 1. And can escape
Indeed, it is an invention that exhibits a remarkable effect.

Further, according to a third aspect of the present invention, in the traveling drive device for the paving machine, the slip detecting means includes:
Since it is constituted by the rotation speed detecting means for detecting the rotation speed of each driving wheel or the rotation speed of each hydraulic motor, it is possible to directly and accurately detect the occurrence of slip or idling and the driving wheel on the slip side. It is an invention that has a truly significant effect.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a hydraulic circuit diagram of a traveling drive device of a paving machine of a paving machine such as an asphalt finisher.

FIG. 2 shows another embodiment of the present invention, and is a hydraulic circuit diagram of a traveling drive device of a paving machine of a paving machine such as an asphalt finisher.

FIG. 3 shows a conventional example, and is a hydraulic circuit diagram of a traveling drive device of a paving machine of a paving machine such as an asphalt finisher.

[Explanation of symbols]

 2 Left drive wheel 3 Right drive wheel 4 Hydraulic motor driving left drive wheel 5 Hydraulic motor driving right drive wheel 6 Oil pump 11 Hydraulic circuit 12 Directional control valve 14, 15 Revolution detection sensor (slip detection means) 18 , 19 Braking system

Continued on the front page F-term (reference)

Claims (3)

[Claims] In a paving machine configured to supply hydraulic oil from one hydraulic pump to hydraulic motors for driving left and right drive wheels, respectively, and to run by rotation of both drive wheels, a slip of left and right drive wheels is provided. Or slip detection means for detecting slippage, and when the slip detection means detects slippage or slippage of one of the drive wheels, supplies pressure oil only to the hydraulic motor on the grip side. Driving device for paving machines to be used. 2. A paving machine configured to supply hydraulic oil from one hydraulic pump to hydraulic motors for driving left and right driving wheels, respectively, and to run by rotation of both driving wheels. Or slip detecting means for detecting slipping, and braking means for braking the left and right driving wheels, respectively. When one driving slip or idling is detected based on a detection value of the slip detecting means, the braking is performed. A traveling drive device for a paving machine, wherein the driving wheel on the slip or idle side is braked by the means. 3. The traveling drive device for a paving machine according to claim 1, wherein said slip detecting means comprises a rotational speed detecting means for detecting a rotational speed of each of said drive wheels or a rotational speed of each of said hydraulic motors.