JPH0618824Y2 - Pavement vehicle traveling speed adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a traveling speed adjusting device for a paving vehicle such as an asphalt finisher or a base paver.

[Prior Art] Conventionally, a vehicle of this type needs a traveling speed control at a very low speed when performing, for example, paving work, and a traveling speed control over a wide range from a low speed to a high speed at the time of forwarding. It is necessary to control the traveling speed in various ways. For this reason, dedicated traveling levers are provided for paving work and forwarding, etc., so that the work traveling lever enables fine speed control during paving work, and during forwarding, low speed is provided by the forwarding travel lever. It is possible to set a wide range of speeds from to high speed.

[Problems to be solved by the invention] However, in the above-mentioned vehicle, it is necessary to operate a dedicated traveling lever for each work or forwarding state, which makes it difficult to adjust the traveling speed. There was a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a traveling speed adjustment device for a paved vehicle that is easy to operate.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a movable member that is provided with a locking member and is movable in the axial direction, and is long in a direction perpendicular to the axial direction of the movable member. Movable by locking the locking member of the movable member relatively movably in the length direction of the elongated hole in the elongated hole formed by bending the movable member in multiple stages in the axial direction while changing the inclination angle. An operating plate that is movable in a direction substantially perpendicular to the axial direction of the member, and a travel that moves the movable member in the axial direction by moving the operating plate to change the locking position of the locking member with respect to the elongated hole. The lever and the connecting member for transmitting the movement of the movable member to the traveling speed control device are provided.

[Operation] When the locking member is locked in the long hole portion having a large inclination angle, the amount of change in speed becomes large, which is suitable for the forwarding operation of the paving vehicle. Further, when the locking member is locked in the long hole portion having a small inclination angle, the amount of change in speed is small, which is suitable for work operation. Therefore, one traveling lever can perform both forwarding and work.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In these drawings, reference numeral 1 denotes a discharge amount control device (not shown) of a variable displacement hydraulic pump (not shown) that supplies hydraulic oil to a variable displacement hydraulic motor (not shown) that drives the asphalt finisher to travel. , A connecting member whose one end is connected. In this connecting member 1, a wire 1a that can be pushed and pulled is arranged in a flexible tube (not shown),
One end side of the wire is connected to the discharge amount control device,
The other end side is connected to the operation plate 2 via a universal joint 3 and a connecting mechanism 4.

The operation plate 2 is formed of a flat plate in a rectangular shape, and a gently inclined long hole 2c is formed at a central portion in the longitudinal direction of the operation plate 2 so as to gradually approach from the bottom side 2a side to the upper side 2b side. On the rear side of the gently sloping elongated hole 2c (the right side is the rear side and the left side is the front side in FIG. 1), the sloping elongated hole 2c is continuous with
A rear steep slanting slot 2d is formed that is inclined so as to approach the upper side 2b rapidly, and on the rear side of this rear steep slanting slot 2d,
A rear parallel elongated hole 2e parallel to the upper side 2b is formed continuously with the rear steeply inclined elongated hole 2d. In addition, a front steep sloped hole 2f is formed on the front side of the gently sloped elongated hole 2c so as to be continuous with the gently sloped elongated hole 2c so as to rapidly approach the bottom side 2a. On the front side of the elongated hole 2f, a front parallel elongated hole 2g is formed continuously with the front steeply inclined elongated hole 2f and parallel to the bottom side 2a. Further, the bottom 2a is formed with a notch 2h extending in the front-rear direction around the front end position A of the gently sloping elongated hole 2c, and the front and rear ends of the bottom 2a and the front and rear ends of the notch 2h have corners 45 A chamfer 2i in the ° direction is formed. The operation plate 2 is supported by a rail 6 having a circular cross section via a bearing 5.

The bearing 5 has an axial center of a prism having a square cross section,
A through hole 5a into which the rail 6 is slidably fitted is formed, and an upper side 2b of the operation plate 2 is fixed by a screw 7 to one side surface thereof. A traveling lever 8 having a spherical knob 8a at the upper end is provided upright on the upper side surface of the bearing 5 when the operation plate 2 is vertically positioned.

In addition, the rail 6 is a frame 9 installed in parallel,
An inner support plate 10 which is hung around the inner support plate 10 and is parallel to the operation plate 2 on the frames 9 and 9.
An outer support plate 11 which is parallel to 0 and is arranged outside the inner support plate 10 is attached. The inner support plate 10 and the outer support plate 11 are provided with the connecting mechanism 4.

The connection mechanism 4 connects the connection member 1 and the operation plate 2, and includes a square rod 12 fixed to the inner support plate 10 and the outer support plate 11. The square bar 12 is positioned substantially at the center of the inner support plate 10 and the outer support plate 11 in the front-rear direction, and has its axial direction oriented in a direction orthogonal to the rail 6. The square rod 12 has a square cross section, and of two facing side faces, one side face is welded to the outer side support plate 11 while being abutted to the outer side support plate 11, and the other side face is welded. Are welded to the inner support plate 10 in such a manner that the edge portions of the two side faces along the are in contact with the ends of the inner support plate 10. Further, the square rod 12 is formed with a through hole 12a having a circular cross-section at the axial center thereof, and a longitudinal groove extending axially through the through hole 12a toward the inner support plate 10 at an axially intermediate portion. 12b
Are formed. Further, the square rod 12 is formed with an enlarged diameter hole portion 12c at both ends in the axial direction thereof.
A slide bearing 13 is fitted and fixed to 2c. A connecting rod (movable member) 14 is fitted in the slide bearing 13 so as to be slidable in the axial direction, and the lower end of the connecting rod 14 has an L-shaped mold for connecting to the universal joint 3. 15 are fixed with bolts 16. Further, a guide roller 17 fitted in the vertical groove 12b of the square rod 12 and movable along the vertical groove 12b of the connecting rod 14, a gently sloping elongated hole 2c of the operation plate 2, and a rear side steep hole at an intermediate position in the axial direction of the connecting rod 14. The tilted elongated hole 2d, the rear parallel elongated hole 2e, the front steeply inclined elongated hole 2f and the front parallel elongated hole 2g are fitted with a positioning roller (locking member) 18 which is movable along them and is attached by a bolt 19. Has been. Further, at both ends of the positioning roller 18, washers 20 having a diameter larger than the width dimension of the gently sloping elongated hole 2c, the rear steeply sloping elongated hole 2d, ... The connection state of is maintained.

In addition, the inner support plate 10 has a slightly inclined long hole of the operation plate 2.
In a state where the positioning roller 18 is positioned in 2c, a work limit switch 21 that is pressed into contact with the bottom side 2a of the operation plate 2 to be in an ON state, a front steep inclined slot 2f, and a front parallel elongated hole 2g. In the state where the positioning roller 18 is positioned in any of the above, in the state where the positioning switch 18 is positioned in the front parallel elongated hole 2g and the backward light limit switch 22 which is turned on in the same manner as above. , The reverse high speed changeover limit switch 23 which is turned on in the same manner as described above, and the positioning roller 1 in the rear parallel elongated hole 2e.
In the state where 8 is positioned, it is turned on in the same way as above.
The forward high speed changeover limit switch 24 is provided. Then, when the positioning roller 18 is positioned at the front end position A of the gently sloping elongated hole 2c, the swash plate of the variable displacement hydraulic pump controlled by the discharge amount control device via the connecting member 1 is at the neutral position (slant). The plate angle is set to zero), and the variable displacement hydraulic pump does not discharge working oil at the neutral position. Also,
When the operation lever 2 is moved to the left side in FIG. 1 by the travel lever 8, the positioning roller 18 causes the front end position A of the gently inclined elongated hole 2c.
In the state in which the variable displacement hydraulic pump is located further rearward, the swash plate of the variable displacement hydraulic pump tilts to the positive side, and hydraulic fluid in the forward direction flows to the variable displacement hydraulic motor for driving the asphalt finisher to travel. ing. Further, when the positioning roller 18 is positioned in front of the front end position A of the gently sloping elongated hole 2c, the swash plate of the variable displacement hydraulic pump is tilted to the negative side, and the variable displacement hydraulic motor is moved backward. Hydraulic fluid is flowing.

In the traveling speed adjusting device configured as described above,
When the traveling lever 8 is moved to the front side, the positioning roller 18
Moves from the front end position A along the gently inclined elongated hole 2c, and the positioning roller 18 gradually moves upward. Then, the wire of the connecting member 1 is gradually pulled and moved, and the swash plate of the variable displacement hydraulic pump controlled by the discharge flow rate control device is gradually inclined to the plus side. Then, the flow rate of the hydraulic oil discharged from the variable displacement hydraulic pump gradually increases,
The rotation speed of the variable displacement hydraulic motor gradually increases, and the speed of the asphalt finisher also gradually increases. Therefore, in this state, it is suitable for finely adjusting the traveling speed during paving work. Further, in this state, the work limit switch 21 is turned on, and the work light or the like is turned on. Furthermore, when the traveling lever 8 is moved to the front side,
The positioning roller 18 comes to be positioned in the rear steeply inclined long hole 2d, and the rate of moving the positioning roller 18 upward with respect to the amount of forward movement of the traveling lever 8 is large. Therefore, the inclination of the swash plate of the variable displacement hydraulic pump changes rapidly with respect to the moving amount of the traveling lever 8, the flow rate of the hydraulic oil discharged from the hydraulic pump increases rapidly, and the asphalt finisher increases. The speed of increases rapidly. Therefore, in this state, it is suitable for traveling at a rapidly increased speed during forwarding. Further, in this state, the work limit switch 21 is separated from the bottom side 2a by the notch 2h and is turned off. Further, when the traveling lever 8 is moved to the front side, the positioning roller 18 comes to be positioned in the rear parallel elongated hole 2e, and the forward high speed switching limit switch 2
4 is pushed by the bottom side 2a of the operation plate 2 to be in the ON state. Then, the electromagnetic switching valve or the like operates, the variable displacement hydraulic motor is switched to the small displacement side, and the hydraulic motor rotates at high speed. As a result, the asphalt finisher travels forward at a higher speed.

When the traveling lever 8 is moved rearward from the above state, the forward high speed switching limit switch 24 separates from the bottom side 2a of the operation plate 2, the variable displacement hydraulic motor is switched to the large displacement side, and the positioning roller is further moved. 18 is a sloping oblong hole 2c
The positioning roller 18 moves downward and the positioning roller 18 moves downward. Then, the wire of the connecting member 1 is pushed and moved, the swash plate of the variable displacement hydraulic pump controlled by the discharge amount control device returns to the neutral side, the discharge flow rate from the hydraulic pump decreases, and the variable displacement The speed of the asphalt finisher is reduced due to the fact that the hydraulic motor is switched to the large capacity side. Then, when the positioning roller 18 is positioned at the front end position A of the gently sloping elongated hole 2c, the angle of the swash plate of the variable displacement hydraulic pump becomes zero and the discharge flow rate from the hydraulic pump also becomes zero, so that the asphalt finisher runs. It will not be driven. Further, when the traveling lever 8 is moved to the rear side, the positioning roller 18 is moved to the front steeply inclined long hole 2f, the wire of the connecting member 1 is further pushed, and the swash plate of the variable displacement hydraulic pump is moved to the negative side. Lean. Then, the variable displacement hydraulic pump discharges the hydraulic oil in the direction for rotating the variable displacement hydraulic motor in the backward direction, and the asphalt finisher moves backward. Also,
In this state, the backward light limit switch 22 is pushed by the bottom side 2a of the operation plate 2 to be turned on. further,
When the traveling lever 8 is moved to the rear side and the positioning roller 18 is positioned in the front parallel elongated hole 2g, the reverse high speed switching limit switch 23 is pushed by the bottom side 2a of the operation plate 2 and turned on. Then, the electromagnetic switching valve or the like operates, the variable displacement hydraulic motor is switched to the small displacement side, the hydraulic motor rotates at high speed, and the asphalt finisher also moves backward at high speed.

In the traveling speed adjusting device configured as described above,
Depending on the position where the traveling lever 8 is moved to the front side, the traveling speed can be adjusted from fine adjustment of the traveling speed during work to high speed traveling during forwarding, and the traveling lever 8 can be adjusted.
By moving to the rear side, it is possible to adjust the reverse speed and the reverse speed. Therefore, compared to the conventional case where the speed is adjusted by properly using various dedicated travel levers for work, forwarding, etc., only one travel lever is required, and the travel speed can be adjusted very easily. .

[Advantages of the Invention] As described above, the present invention is configured as described above. Therefore, by moving the operation plate with the traveling lever, the moving direction of the operation plate (direction perpendicular to the axial direction of the movable member). It is possible to change the pushing / pulling amount of the connecting member by changing the locking position of the locking member with respect to the elongated hole formed by bending the movable member in a plurality of steps in the axial direction by changing the inclination angle. Therefore, the traveling speed can be slightly changed or abruptly changed according to the change in the push / pull amount. Therefore, the traveling speed can be adjusted extremely easily as compared with the conventional case where the traveling speed is adjusted by properly using a plurality of dedicated traveling levers for work and forwarding.

[Brief description of drawings]

FIGS. 1 to 3 are views showing an embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is the sectional view of FIG.
It is sectional drawing which follows the III-III line. 1 ... Connecting member, 2 ... Operation plate, 2c ... Slowly sloping long hole, 2d ...... Rear steeply sloping hole, 2e …… Rear parallel long hole, 2f …… Front steeply sloping hole, 2g… … Front parallel slot.

Claims (1)

[Scope of utility model registration request] 1. A movable member (14) provided with a locking member (18) and movable in the axial direction, and movable in a direction perpendicular to the axial direction of the movable member (14) with a long inclination angle. Long holes (2c, 2d, 2) formed by bending the member (14) in the axial direction in a plurality of steps
e, 2f, 2g), the locking member (18) of the movable member (14).
An operation in which the above-mentioned elongated holes (2c, 2d, 2e, 2f, 2g) are relatively movably locked in the lengthwise direction so as to be movable in a direction substantially perpendicular to the axial direction of the movable member (14). Board (2),
By moving the operation plate (2), the long holes (2c, 2d, 2e, 2
f, 2g) the traveling lever (8) for moving the movable member (14) in the axial direction by changing the engaging position of the engaging member (18), and the traveling speed control for the movement of the movable member (14). A traveling speed adjusting device for a paved vehicle, comprising: a connecting member (1) for transmitting the device.