JPH0953216A - Side brush device in road sweeper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the push-up of a side brush by soil and sand, etc., solidly adhering on the side slope of a road surface, a gutter, etc., when the side brush automatically follows up to the side slope and soil and sand, etc., are swept in normal road sweeping. SOLUTION: When there are solidly adhereing soil and sand, etc., a laterally tilted cylinder 65 is controlled by a changeover valve 103, the lateral inclination of a side brush 3 is conformed to the side slope of a gutter, etc., the changeover valve 103 is placed at a neutral position, and the side brush 3 is fixed so as not to escape by soil and sand. The block state of a changeover valve 111 is released at the time of normal sweeping operation, and a brush bearing body 24 is followed up automatically to the side slope angle of the gutter 70 by turning moment by weight and a tension spring 62. Oil is moved freely between the laterally tilted cylinder 65 and a tank 51 at that time, and the laterally tilted cylinder 65 functions as a shock absorber by viscous resistance in a piping duct.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side brush device for a road cleaning vehicle, and more particularly to a device for adjusting a lateral inclination angle of a side brush to a lateral inclination angle of a road surface or a gutter.

[0002]

2. Description of the Related Art A side brush of a side brush device for a conventional road cleaning vehicle has a front side of a brush, which is inclined by a predetermined amount in a lateral direction with respect to a traveling direction of a vehicle body and a traveling direction of the vehicle body. The portion and the outer lateral portion are brought into contact with the road surface with a predetermined ground load, and the rear portion of the brush and the inner lateral portion are not grounded, so that dust and the like on the road surface are surely swept into the cleaning range of the main brush. In this case, the lateral lateral inclination angle (hereinafter, lateral inclination angle) is different depending on the road surface and the shape of the gutter, so that the side brush automatically follows the lateral inclination angle of such a gutter or road surface. This is disclosed in Japanese Patent Publication No. 54-19115. According to this device, the tilt bracket is movably supported on the chassis of the cleaning vehicle, and the brush support, which rotatably supports the side brush, is supported on the tilt bracket with respect to the traveling direction of the cleaning vehicle via the pivot shaft. It is mounted so that it can be swung laterally, and the brush bearing is configured to generate a rotational moment in one direction about the pivot axis by its own weight or by a cylinder.The brush bearing is lowered and the side brush is grounded. When the
The side brush automatically follows the lateral inclination angle of the road surface or gutter.

[0003]

In the above apparatus, the side brush automatically tilts following the lateral tilt angle of the side groove or the like due to the weight of the side brush or the like and the cylinder force of the cylinder for generating the rotational moment. There is no need to adjust the lateral inclination angle of the side brush to match the lateral inclination angle of the road surface with each other, and the ground contact area of the side brush hardly changes. When the soil is firmly adhered to the gutter, the side brush automatically follows the lateral inclination angle of the gutter, etc., so the side brush pushes up the side brush and It turned out that there was a problem that left behind a sweep. An object of the present invention is to eliminate the need for adjusting the lateral inclination angle of the side brush by automatically following the lateral inclination angle when cleaning a normal road surface or gutter, and even when dirt or the like is firmly attached to the gutter. , It is to provide a side brush device that can remove this. Moreover, the other subject of this application is providing the apparatus which can control such a side brush from the driver's seat of a road surface cleaning vehicle.

[0004]

In order to solve the above problems,
According to claim 1 of the present application, as described above, in the side brush device in the road cleaning vehicle in which the side brush automatically follows the lateral inclination angle of the road surface or the gutter, between the tilt bracket and the brush support body. Interposing a lateral tilt cylinder that can forcibly change the lateral tilt angle of the side brush,
The lateral tilt cylinder is provided with a first switching valve that is controlled to block the pressure oil when the side brush has a desired lateral inclination angle by switching the direction in which the pressure oil is supplied from the pressure oil supply source. When the forced tilt control by the first switching valve is blocked, when the forced tilt control by the first switching valve is not performed, two cylinder chambers of the lateral tilt cylinder are connected to the tank by piping so as to communicate with each other. It is characterized in that it is connected to the switching valve. According to a second aspect of the present invention, the first switching valve is a closed center four-port three-position electromagnetic switching valve, and the lateral tilt amount control switch for controlling the solenoid of the switching valve normally makes the first switching valve neutral. The second switching valve has a spool position in which the P and R ports do not normally communicate with the A and B ports, and the P and R ports have A and
A 4-port 2-position electromagnetic switching valve having a spool position communicating with a corresponding port of the B port, the P and R ports of which are respectively connected to the tank by piping.
The A and B ports are respectively connected to the two cylinder chambers of the lateral tilt cylinder by piping, and a side brush fixing / following selection switch for turning on / off the solenoid of the second switching valve and the lateral tilt amount control. And a switch provided in the driver's seat. A third aspect of the present invention is a brush bearing in which a tilt bracket is movably supported on a chassis of a cleaning vehicle and a side brush is rotatably supported on the tilt bracket. The body is mounted so as to be swingable laterally with respect to the traveling direction of the cleaning vehicle via a pivot, and the brush bearing is configured to generate a rotational moment in one direction about the pivot. When the side brush is lowered to bring the side brush into contact with the ground, the side brush device in the road cleaning vehicle is configured to automatically follow the lateral inclination angle of the road surface or the side groove due to the rotation moment. If a lateral tilt cylinder that can forcibly change the lateral tilt angle of the side brush is interposed between the brush bearing and the lateral tilt angle of the side brush is fixed In this case, the pressure oil is controlled to be supplied to the lateral tilt cylinder, the side brush is set to a desired lateral inclination angle, and then the pressure oil supply is blocked to fix the side brush at the lateral inclination angle. In order to automatically follow the lateral tilt angle of No. 2, the two cylinder chambers of the lateral tilt cylinder are communicated with the tank, and the lateral tilt cylinder is made to act as a shock absorber by the oil line resistance.

[0005]

According to the first aspect of the present invention, when the first switching valve is blocked, the second switching valve causes the horizontal tilt cylinder 2 to operate.
When the two cylinder chambers are brought into communication with the tank, the side brush automatically follows the lateral inclination angle of the side groove or the like due to the unidirectional rotation moment of the brush support. At this time, as described in claim 3, since the two cylinder chambers of the lateral tilt cylinder and the tank are in communication with each other, when the lateral inclination angle of the side brush automatically changes due to the inclination of the side groove or the like. , The piston of the horizontal tilt cylinder is pushed and pulled,
The oil in the two cylinder chambers of the horizontal tilt cylinder flows to the tank, and also flows from the tank to the cylinder chamber, and the viscous resistance of the oil in the pipe due to the flow prevents the piston from abruptly moving. Even when the cylinder functions as a shock absorber and automatically follows the rotation moment, the swing of the side brush can be damped.
Further, when solid sand or the like adheres to the gutter or the like, the second switching valve is blocked, and the first switching valve is operated in that state to supply pressure oil to the horizontal tilt cylinder to supply the horizontal tilt cylinder. The protrusion amount of the piston rod is controlled to adjust the lateral inclination angle of the side brush to the lateral inclination angle of the side groove or the like to block the first switching valve. Since the protruding position of the piston rod of the lateral tilt cylinder is fixed in this way, the lateral inclination angle of the side brush is fixed according to the lateral inclination angle of the gutter, etc. It can be swept out of the gutter without being pushed up by. Further, according to the second aspect, such a switching valve is controlled by the selection switch and the lateral tilt amount control switch provided in the driver's seat.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 3, a support shaft 2 is fixed to a chassis 1. A suspension device 4 of a gutter drum 3 is horizontally swingably attached to the support shaft 2. In this suspension device 4, support arms 7a and 7b are vertically projected from the rear surface (right side in FIG. 1) of the base plate 6 of the support bracket 5, and these support arms 7a and 7b are rotatable about the support shaft 2. It is attached. As shown in FIG. 2, a pushing cylinder 8 for horizontally swinging the suspension device 4 is connected between the tip of the lower support arm 7b and the chassis 1. A pair of left and right upper bearing portions 9 and 9 are provided on the upper rear surface of the substrate 6, and a pair of left and right lower bearing portions 10 and 10 are also provided below the front surface (left side in FIG. 1). Between the upper bearings 9, 9, one end of the support rod 11 is a pin 1
It is supported by 2 so as to be swingable up and down. One end of a lower support arm 13 is supported on the lower support portions 10 and 10 by a pin 14 so as to be vertically swingable. The other end of the lower support arm 13 has a pin 1 between the lower support portions 16 and 16 of the tilt bracket 15.
It is rotatably connected by 7. Tilt bracket 1
A pivot pin 19 is rotatably supported between the upper support portions 18, 18 of No. 5, and the other end of the support rod 11 is inserted into a through hole 19a of the pivot pin 19 so as to be axially movable. There is. A seat 20 is loosely fitted to the support rod 11 in front of and behind the rotating pin 19 so as to be movable in the axial direction. The spring 2 is provided between the seat 20 and the washer 21 fixed to the support rod 11.
2 is interposed. An adjusting nut 23 is screwed onto the tip of the supporting rod 11, and the adjusting nut 23 is pressed against the rotating pin 19 via the seat 20 by the force of the spring 22. In this way, the support rod 11, the support bracket 5, the lower support arm 13,
With the parallel link mechanism including the tilt bracket 15, the tilt bracket 15 moves up and down with respect to the support bracket 5 without changing the vertical angle.

The back of the tilt bracket 15 (right side in FIG. 1)
Brush support 2 that rotatably supports the side brush 3
A hydraulic motor 26 is fixed to the upper surface of the plate 4 with a plate member 25 interposed therebetween. As in the conventional case, the side brush 3 is provided so as to incline at a predetermined angle forward of the cleaning vehicle in the traveling direction in the grounded state, as shown in FIG. The rotary shaft 26a of the hydraulic motor 26 is connected to the side brush 3. An L-shaped lever 27 shown in FIG. 3 is integrally fixed to the front surface of the brush support 24. The L-shaped lever 27 and the brush bearing 24 are laterally displaced from the rotary shaft 26a of the hydraulic motor 26 (L-shaped lever 27, brush bearing 24, hydraulic motor 26, side brush 3, etc.). The pivot shaft 28 protruding from the tilt bracket 15 to a position displaced toward the inside of the vehicle body from the center of gravity of the entire swing member that is swingably supported by the pivot shaft 28, including
3, the L-shaped lever 27 together with the side brush 3 is swingably supported in the lateral direction of the chassis 1 (lateral direction with respect to the traveling direction), and the weight of the entire swing member causes the L-shaped lever 27 to move in FIG. A counterclockwise rotation moment is generated in the entire swing member including the brush support 24. A bolt 61 is screwed to the bracket 60 fixed to the tilt bracket 15 so that the position thereof can be adjusted, and a tension spring 62 is stretched between the bolt 61 and the longitudinal middle portion of the L-shaped lever 27, so that the brush bearing body is supported. In addition to the rotational moment due to the weight, a counterclockwise rotational moment due to the spring 62 is added to 24. An end of a cylinder tube 66 of a horizontal tilt cylinder 65 is swingably and pivotally attached to a tip of the bracket 60, and a tip of a piston rod 67 of the horizontal tilt cylinder 65 is rotatably pin-connected to a tip of an L-shaped lever 27. is there. In the horizontal tilt cylinder 65, the inside of the cylinder tube 66 is divided into two upper and lower cylinder chambers 6 by a piston 68.
It is a double-acting cylinder divided into 9,70.

In the hydraulic circuit 100 for controlling the horizontal tilt cylinder 65, the piping system 10 including the hydraulic pump 48 (FIG. 4) as a hydraulic pressure supply source and the horizontal tilt cylinder 65.
A closed center 4-port 3-position solenoid directional control valve (first directional control valve) 103 is interposed at 2. The two solenoids 103a and 103b of the electromagnetic switching valve are the two switching contacts 104a and 104 of the lateral tilt amount control switch 104.
Wired to b respectively. The lateral tilt amount control switch 104 is, for example, a toggle switch, is disposed inside the driver's seat 150 of the road cleaning vehicle, and has a manual switch piece 104c connected to the power source 105, which is the switching contacts 104a, 1a.
The switch piece 104c is sandwiched by a pair of springs 106 on both sides thereof so that the switch piece 104c can be selectively contacted with the switching contact 104b.
It is configured to maintain a neutral position where it does not come into contact with either a or 104b. Next, 4 ports 3 of the piping system 102
Another piping system 110 is branched toward the tank 51 from the piping portion from the A and B ports of the position electromagnetic switching valve 103 to the lateral tilt cylinder 65, and this piping system 110 has a 4-port two-position electromagnetic switching. Valve (second switching valve) 111
Is interposed. This switching valve 111 normally corresponds to the spool position where the P and R ports are in a blocked state where they do not communicate with the A and B ports due to the built-in spring, and the P and R ports correspond to the A and B ports when the solenoid of its own operates. Port, which has a spool position in communication with each of the ports, the P and R ports of which are connected to the tank 51 by piping, and the A and B ports of which are laterally tilted via the piping system 111. Two cylinder chambers 6 of the cylinder 65
It is connected to 9, 70 by piping. Then, the solenoid of the switching valve 111 is turned on and off, and the lateral tilt cylinder 65
The fixed / following selection switch 112 of the side brush 3 for selecting whether to fix the piston rod 67 or to make it freely movable is also provided in the driver's seat 150.

A lifting chain 30 is connected to the plate member 25, and when the side brush 3 is not used, the lifting chain 30 is rolled up and lifted inside the chassis 1 and to a storage position A shown by a chain double-dashed line in FIG. Is done. A circular arc hole 31 is formed at the upper end of the L-shaped lever 27, and a locking pin 32 on the rear surface of the tilt bracket 15 is fitted into the circular arc hole 31, and the side brush 3 is lifted by a lifting chain 30. Sometimes, the rotation of the L-shaped lever 27 about the pivot 28 is stopped. In this way, the side brush 3 winds up the lifting chain 30,
By rewinding and operating the extrusion cylinder 8, the chassis 1
The storage position A, which is located below and does not clean the road surface, and the chassis
It protrudes to the side of the shank 1 and moves to and from a work position B for cleaning the road surface.

Next, since the support bracket 5 of the suspension device 4 does not move up and down, the chassis 1 in the up and down direction is used.
It also serves as a part of chassis 1. The head side end of a cylinder device 33 for elastically suspending the brush supporting body 24 is rotatably connected to a pin 34 below the supporting rod 11 to the upper supporting portions 9 of the supporting bracket 5. Has been done. Further, a U-shaped connecting portion 35 is fixed to the middle portion of the lower support arm 13, and the connecting portion 3
5, the tip of the piston rod 36 of the cylinder device 33 is rotatably connected to the pin 35a. This cylinder device 33
Is known in Japanese Utility Model Publication No. 5-35140, and as shown in FIG. 4, a cylindrical piston having a rod side opening is provided in a cylinder body 40 composed of head and rod caps 37, 38 and a cylinder tube 39. 41 is fitted so as to be slidable in the axial direction. The rear end of the piston rod 36 is located inside the piston 41, and the tip of the piston rod 36 is projected from the cylinder body 40. A seat 42 is fixedly attached to the rear end of the piston rod 36. Between the seat 42 and the collar 44 which is secured to the piston 41 by the snap ring 43, the compression spring 4
5 intervenes and constantly urges the piston rod 36 toward the head side (left side in FIG. 4). The front cylinder chamber 46 defined by the piston 41 is connected to a pump 48 via an electromagnetic switching valve 47 having a flow path of APB. A pressure gauge 49 is connected in the middle of the pipe, and the display can be monitored at the driver's seat. The rear cylinder chamber 50 is directly connected to the tank 51. The pressure of the pressure oil supplied to the cylinder device 33 is small depending on the amount of dust when the side brush 3 is new, when the side brush 3 is slightly worn due to work, and when it is worn just before replacement. When the side brush 3 is in contact with the piston (Fig. 1), the pressure can be changed depending on the degree of work, such as light work when the side brush 3 is normal, medium work when the dust is normal, heavy work when the dust is heavy. Rod 36
The position of the piston 41 with respect to is changed, the contraction amount of the spring 45 is changed, and the pulling force of the lower support arm 13 generated by the piston rod 36 is adjusted so that the side brush 3 is grounded to the road surface with a predetermined ground load. There is.

Next, the operation will be described. The side brush 3 in the storage position A, which is lifted from the road surface inside the chassis 1, is pushed out to the side by the pushing cylinder 8, is positioned above the working position B shown in FIG. 2, and the lifting chain 30 is rewound, and Adjusting the pulling force by the cylinder device 33 depending on the degree of wear of the side brush 3 and the state of dust on the road surface,
The side brush 3 is elastically pulled up by the spring 45 and grounded to the side groove 70 with a predetermined ground load. Gutter 70
When dirt or the like is firmly attached to the
2 is turned off and the switching valve 111 is positioned on the block side. Then, the lateral tilt amount control switch 104
The switch piece 104c is rocked against the force of the spring 106 to bring it into contact with either of the switching contacts 104a and 104b, thereby making one of the solenoids 103a and 103b conductive and changing the spool position of the switching valve 103. The projection amount of the piston rod 67 of the lateral tilt cylinder 65 is controlled while gazing at the side mirror from the driver's seat 150 so that the lateral inclination angle θ of the side groove 70 to be switched and cleaned matches the lateral inclination angle of the side brush 3. To do. After confirming that the lateral inclination angle of the side brush 3 matches the lateral inclination angle θ of the side groove 70, when the operator releases his hand from the switch piece 104c, the spring 106 returns the switch piece 104c to the neutral position and the solenoid 103a ( Or the power supply of 103b) is cut off,
The spool of the switching valve 103 also returns to the neutral position, the flow of pressure oil is blocked, and the side brush 3 is fixed while tilted. In this state, the side brush 3 tilts forward in the side groove 70 and rotates, so that the side brush 3 is not pushed up by the soil and the like that are firmly attached to the side groove 3. It is swept out and there is no unswept residue.

Next, when there is no solid earth and sand adhered to the side groove 70 and there is earth and sand or dust which is not so adhered, the selection switch 112 is turned on and the state is kept. Then, the solenoid of the switching valve 111 is energized, and the spool thereof is switched to a spool position where the A and B ports communicate with the P and R ports, and as a result, the upper and lower cylinder chambers 69 and 70 of the lateral tilt cylinder 65 are tanked. Communicate with 51. Therefore, the horizontal tilt cylinder 65
Since the piston rod 67 is not fixed and can freely move up and down, when the side brush 3 moves while rotating along the side groove 70 in this state, the brush bearing 2
4 is the lateral inclination angle θ of the side groove 70 due to the weight and the counterclockwise rotation moment about the pivot 28 due to the tension spring 62.
The lateral inclination angle of the side brush 3 does not have to be adjusted to the lateral inclination angle θ of the side groove 70, because the lateral inclination angle is automatically changed and the lateral inclination angle is changed accordingly.
The dirt and dust inside can be satisfactorily swept out. When the side brush 3 automatically follows in this way, since the cylinder chambers 69 and 70 of the horizontal tilt cylinder 65 are in communication with the tank 51, the piston 68 of the horizontal tilt cylinder 65 is pushed and pulled, and the two of the horizontal tilt cylinder 65 are pushed. Oil in the one cylinder chamber 69, 70 flows to the tank 51, and
Flow into the cylinder chambers 69 and 70, and the viscous resistance of the oil in the piping system 110 caused by the flow prevents the piston 68 from abruptly moving.
5 functions as a shock absorber, and the side brush 3
It is possible to prevent the side brush 3 from swinging due to vibration or the like due to traveling of the road cleaning vehicle, and prevent the side brush 3 from separating from the road surface during the cleaning work. The rotation moment may be due to the weight alone.

[0013]

As described above, according to the present invention, the second switching valve is blocked when the soil or the like is firmly attached to the gutter or the like, and the first switching valve is operated in that state to remove the pressure oil. It is supplied to the lateral tilt cylinder to control the amount of protrusion of the piston rod of the lateral tilt cylinder to match the lateral tilt angle of the side brush to the lateral tilt angle of the side groove or the like, and block the first switching valve to control the lateral tilt cylinder. Since the protruding position of the piston rod is fixed, the side brush can be fixed at an angle matching the lateral inclination angle of the side brush to an arbitrary lateral inclination angle such as a side groove, and the side groove or the like can be cleaned in the fixed state. It can be swept out of the gutter without being pushed up by the solidly adhered earth and sand. Further, when soil, dust, etc. are not so hard to adhere to the gutter or the like, the second switching valve allows the two cylinder chambers of the lateral tilt cylinder to communicate with the tank while the first switching valve is blocked. The side brush can automatically follow the lateral inclination angle of the side groove or the like by a rotational moment in one direction of the brush support, and it is not necessary to change the lateral inclination angle. Further, at this time, since the two cylinder chambers of the horizontal tilt cylinder and the tank respectively communicate with each other, the piston of the horizontal tilt cylinder is pushed and pulled to flow between the two cylinder chambers of the horizontal tilt cylinder and the tank. The horizontal tilt cylinder can function as a shock absorber due to the viscous resistance in the pipe due to the oil, and there is an advantage that the swing of the side brush can be damped even in the case of automatically following the rotation moment. Further, in the present application, since such a switching valve is controlled by the selection switch and the lateral tilt amount control switch provided in the driver's seat, it is not necessary to get out of the driver's seat and there is an advantage that workability is improved. .

[Brief description of drawings]

FIG. 1 is a side view of a side brush device.

FIG. 2 is a plan view of FIG.

FIG. 3 is a view taken along line III of FIG. 2, which is shown together with a hydraulic piping system.

FIG. 4 is an enlarged sectional view of a cylinder device for suspension.

[Explanation of symbols]

 1 Chassis 3 Side Brush 15 Tilt Bracket 24 Brush Support 28 Axis 48 Pump (Pressure Oil Supply Source) 51 Tank 65 Horizontal Tilt Cylinder 69 Cylinder Chamber 70 Cylinder Chamber 103 4-Port 3-Position Electromagnetic Switching Valve (First Switching Valve) 104 Lateral tilt amount control switch 111 4-port 2-position electromagnetic switching valve (second switching valve) 112 Fixed / following selection switch 150 Driver's seat

Claims (3)

[Claims] 1. A brush support body, which supports a tilt bracket so as to be movable up and down, on a chassis of a cleaning vehicle, and a brush support rotatably supporting a side brush is supported on the tilt bracket with respect to a traveling direction of the cleaning vehicle via a pivot shaft. The brush support is mounted so as to be swingable in the lateral direction, and is configured to generate a rotational moment in one direction about the pivot axis on this brush support, and when the brush support is lowered and the side brush is grounded, the rotation In a side brush device in a road cleaning vehicle in which the side brush automatically follows the lateral inclination angle of the road surface or gutter due to the moment, the lateral inclination angle of the side brush is set between the tilt bracket and the brush support. A lateral tilt cylinder that can be forcibly changed is interposed, and the side tilt cylinder is used to switch the direction of pressure oil supply from the pressure oil supply source. The first switching valve that is controlled to block the pressure oil when the thrust reaches a desired lateral tilt angle, and the first switching valve that is blocked during the forced tilt control by the first switching valve, and the forced tilt by the first switching valve A side brush device in a road cleaning vehicle, characterized in that a second switching valve connected to the tank by piping is connected so that the two cylinder chambers of the lateral tilt cylinder communicate with the tank when control is not performed. 2. The first switching valve is a closed center 4-port 3-position electromagnetic switching valve, and a lateral tilt amount control switch for controlling a solenoid of the switching valve normally keeps the first switching valve neutral. The second switching valve has a spool position in which the P and R ports do not normally communicate with the A and B ports, and P, R when the solenoid of itself acts.
A 4-port 2-position solenoid directional control valve in which the R port has a spool position communicating with the corresponding port of the A and B ports, and the P and R ports of which are respectively connected to the tank by piping, The port B is connected to two cylinder chambers of the lateral tilt cylinder by pipes, and has a side brush fixing / following selection switch for turning on / off the solenoid of the second switching valve and the lateral tilt amount control switch. The side brush device for a road cleaning vehicle according to claim 1, wherein the side brush device is provided in a driver's seat. 3. A brush support body, which supports a tilt bracket so as to be vertically movable on a chassis of a cleaning vehicle, and a side brush is rotatably supported on the tilt bracket, with respect to a traveling direction of the cleaning vehicle via a pivot. The brush support is mounted so as to be swingable in the lateral direction, and is configured to generate a rotational moment in one direction about the pivot axis on this brush support, and when the brush support is lowered and the side brush is grounded, the rotation In a side brush device in a road cleaning vehicle in which the side brush automatically follows the lateral inclination angle of the road surface or gutter due to the moment, the lateral inclination angle of the side brush is set between the tilt bracket and the brush support. When a lateral tilt cylinder that can be forcibly changed is interposed and the lateral tilt angle of the side brush is fixed, pressure oil is supplied to this lateral tilt cylinder. When the side brush is set to the desired lateral inclination angle, the pressure oil supply is blocked, the side brush is fixed at the lateral inclination angle, and when the side brush automatically follows the lateral inclination angle of the road surface, etc. A side brush device in a road cleaning vehicle, characterized in that two cylinder chambers of a cylinder are communicated with a tank, and a lateral tilt cylinder is made to act as a shock absorber by the oil line resistance.