JP3043935B2 - Lift work vehicle control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a lift working vehicle.

[0002]

2. Description of the Related Art A conventional operating device for traveling a lift work vehicle is configured such that a transmission lever is neutralized and power from an engine is controlled by a clutch mechanism.
After shifting to the FF, operating the transmission lever to select the position of the drive transmission mechanism, and shifting the gear, the clutch mechanism was turned on again to shift the gear, so the operation was troublesome.

[0003] The present invention solves the above-mentioned drawbacks, and allows the traveling vehicle to move forward and backward by rotating the foot pedals back and forth.
An object of the present invention is to provide a control device for a lift working vehicle that is retracted.

[0004]

The gist of the present invention will be described with reference to the accompanying drawings.

[0005] An arm support 2 is provided upright at the rear of the traveling vehicle 1, and an up-and-down arm 4 is provided on the arm support 2 so as to be raised and lowered by the operation of a hydraulic cylinder device 3.
A worktable 5 is attached to the tip of the worktable, and an operation pedal 6 is rotatably provided on the worktable 5.
29, reverse lever 30, and mission switching lever 46
The operating petal 6 is pivoted in one direction by the protruding lever 29 and the forward lever 29.
Forward link 41 that works only for
Activates only in the other direction with the lever 46
Reversing link 42 and mission switching link 67
It is attached separately, and the operation petal 6
The tension pulley 8 opposed to the traveling drive belt 7 is pressed against the traveling drive belt 7 by the operation transmission mechanism 9 via the forward link 41 to cause the traveling vehicle 1 to travel forward, and the backward link is caused by the falling rotation to the other side. 42 mission switching link 67 at the same time to press the tension pulley 8 to the running drive belt 7 by the same actuating transmission mechanism 9 via the
The gears of the drive transmission mechanism 10 are moved by the switching device 11 via the
The present invention relates to a control device for a lift work vehicle, which is provided so as to cause the traveling vehicle 1 to travel backward by turning the vehicle.

[0006]

[Action] Forward lever 29, reverse lever 30, and mission
When the operation pedal 6 having the switching lever 46 protruding is turned to one side, the operation transmission mechanism 9 is moved via the forward link 41.
As a result, the tension pulley 8 presses the traveling drive belt 7 to transmit the power of the engine to the drive transmission mechanism 10,
The traveling vehicle 1 moves forward.

When the tilting operation of the operation pedal 6 is returned, the tension pulley 8 separates from the traveling drive belt 7 and the tension of the belt is loosened.

When the operation pedal 6 is turned to the other side, the rear
As described above, the traction pulley 8 presses the traveling drive belt 7 by the operation transmitting mechanism 9 via the retreat link 42 and at the same time, the switching device via the transmission switching link 67.
11 to move the gear of the drive transmission mechanism 10 to drive
The output rotation of the dynamic transmission mechanism 10 reverses, and the traveling vehicle 1 travels backward.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate one embodiment of the present invention.
An arm support 2 is provided upright at the rear of the traveling vehicle 1, and an up-and-down arm 4 is provided on the arm support 2 by operating the hydraulic cylinder device 3, and a work table 5 is attached to a tip of the up-and-down arm 4.

In the illustrated embodiment, a traveling track type traveling vehicle is illustrated as the traveling vehicle 1, but a wheel traveling type or a semi traveling traveling type traveling vehicle may be used. An arm 13 having a frame 13 provided on a chassis 12 at the rear of the traveling vehicle 1, a turning cylinder 14 erected substantially at the center of the frame 13, and a turning shaft 15 ′ projecting downward from the turning cylinder 14. Insert the support 15 and pivot the upper part of the arm support 15
14 and the upper and lower parts of the revolving shaft 15 '
An arm support 15 supported by 4 ′ is provided so as to be horizontally rotatable with respect to the rotation holding cylinder 14 to form the arm support 2.

A support shaft 16 is provided horizontally near the upper portion of the arm support 15.
Then , the base of the up-and-down arm 4 is axially attached to the support shaft 16, and the bracket 5 ′ of the work table 5 on which the operator works at high places is axially attached to the tip of the up- and-down arm 4 with the pin 17. A support shaft 18 is horizontally provided at a predetermined distance on the arm support 15 above the support shaft 16, and a pin
A pin 19 is provided on the bracket 5 'above the bracket 17 at a position having a length equal to the distance between the support shafts 16 and 18, and a connecting rod 20 is mounted and mounted between the support shaft 18 and the pin 19 by rotating the support shaft 16. · between pin 17 of the length and the length between the support shaft 18, pins 19 equal Kunar so configuring. still,
In the figure, reference numeral 21 denotes a turnbuckle for adjusting the length of the connecting rod 20.

An arm bracket 22 is provided below the raising and lowering arm 4, and a shaft 23 is provided below the arm support 15.
The base of the hydraulic cylinder device 3 is axially mounted on the shaft 23, and the other end of the piston rod 3 ′ of the hydraulic cylinder device 3 is axially mounted on the shaft 24 attached to the arm bracket 22, and the hydraulic cylinder device 3 is operated to operate the piston. When the rod 3 ′ is extended and retracted to raise and lower the arm 4, the distance between the axes of the
· 17, the length between the shafts 18 and 19 of the connecting rod 20, the shafts 16 and 18, pins
Since the length between 17 and 19 is set to the same length and the parallel crank mechanism is set as the link mechanism, the bottom of the worktable 5 moves up and down almost parallel to the ground.

A pivot arm 25 is fixed to the lower end of the pivot shaft 15 'of the arm support 15, and the other end of the piston rod of the pivot cylinder (not shown) is pivotally attached to the tip of the pivot arm 25. The base is fixed to the chassis 12 and the arm support 15 is provided so as to horizontally rotate left and right with respect to the chassis 12 by the operation of the swing cylinder.

A channel-shaped bracket 27 having an opening at the bottom is vertically provided on the lower surface of the floor surface of the work table 5, and bearings are provided on left and right vertical plates of the bracket 27, and between the left and right bearings. The pin shaft 28 is rotatably wrapped around the pin shaft 28
The operation pedal 6 has a bearing portion fixed thereto, and the other end of the operation pedal 6 is protruded above the floor surface of the worktable 5, and a foot portion 6 'is provided at the protruding end.

[0015] the pin shaft 28 by fastening the base portion of the forward lever 29 and backward lever 30 and the transmission switching lever 46 of the two configurations by welding, the lever 29, the forward tip of each of 46 The lever 29 is obliquely rearward and upward about 45 ° with respect to the horizontal direction, and the retreat lever 30 is obliquely rearward and downward about 45 ° with respect to the horizontal direction.
With the lever 46 for switching the sash, it is projected obliquely forward and downward at about 60 ° .

The forward end of the lever 29 is closer to the rear end.
The base of the forward link 41 having a long hole 41 ′ is
At the end of the retraction lever 30, a long hole 42 'is located near the rear end.
Axes wear pin 44 a base of the backward link 42 which have a. An engine 34 is attached on a platform almost in the center of the lower chassis 12 ',
A drive pulley 35 for separating the power of the engine 34 is provided at one end of an output shaft of the engine 34, and a chassis 12 behind the engine 34 is provided.
A drive transmission mechanism 10 for driving the traveling vehicle 1 by the power of the drive pulley 35 is provided above the drive transmission mechanism 10.
Attach the driven pulley 36 to the input shaft 10 '
5, to pass over the running drive belt 7 between the driven pulley 36. A channel-shaped bracket having an opening at the top is erected on the lower chassis 12 ′, and a pin shaft 37 is rotatably bridged between the left and right standing side plates of the bracket. The base of the arm is fixed by welding, the tip of the arm is projected obliquely rearward and upward, and the tension pulley 8 is rotatably mounted on the projected end. The base of the lever 38 is fixed to the pin shaft 37 by welding, the other end is projected obliquely forward and upward, and when the projected end is turned in the counterclockwise direction in FIG. The driven pulley 36 is driven by the power of the driving pulley 35 by pressing the upper surface of the driving belt 7 so that the tension pulley 8 is separated from the traveling driving belt 7 and the power is not transmitted when the lever 38 is returned.

The operation transmission mechanism 9 will be described.

A bracket 31 is suspended from the lower surface of the worktable 5 behind the bracket 27, and a guide wheel 33 for guiding a flexible wire 32 for operation can be vertically rotated on the bracket 31.
The provided via a back spring 39 to the distal end portion of the lever 38 connecting the flexible Bull wire 32 for operation, the distal end of the flexible Bull wire 32 through the arm support 15, relief arm 4, the guide wheel 33 stretched Te, and fastened the leading end to the base of the clevis-shaped wire end 40, the long hole 41 between the right and left guide side plates of the wire ends 40 ', 42' of the retraction link 42 and forward link 41 having a insert and the long hole 41 ', 42' and 'axially wear, operation pedal 6 the pin 40 in a state of neutral i.e. upright' the other end comrades wire end 40 pin 40 located long hole 4
1 ', 42' and configured to be set under tension to the left end of the
To constitute the operation transmission mechanism 9.

An input shaft 10 'supported by left and right bearings 49, 49 is rotatably provided near an upper portion of a case body 48 of the drive transmission mechanism 10, and a spline portion is provided substantially at the center of the input shaft 10'. An external gear 50 for forward movement and an external gear 51 for backward movement are not slidable to the left and right of the spline section of the input shaft 10 '.
A clutch sleeve 52 provided rotatably with respect to 10 'and internally provided with internal gear portions 50' and 51 'meshing with the gears 50 and 51 is fitted to the spline portion so as to be slidable left and right.

The input shaft 10 'is located near the upper portion of the case body 48.
A shift shaft 53 is provided in parallel with the shift shaft 53. The tip of the shift shaft 53 is fitted with the base of a shift lever 54 having a bifurcated shape.
The shift lever 54 is provided on the shift shaft 53 so as to be slidable left and right, and the bifurcated tip of the shift lever 54 is inserted into a groove recess 52 ′ provided on the outer periphery of the clutch sleeve 52 so that the tip comes into contact with the groove side surface. . A spring 55 is attached to the shift shaft 53 between the right side surface of the shift lever 54 and the right case inner wall of the case body 48.
And the shift lever 54 is urged leftward to push the clutch sleeve 52 leftward so that the internal gear 50 ′ always meshes with the right end of the forward gear 50.

In a normal state, when the input shaft 10 'rotates, the clutch sleeve 52 rotates, and the forward external gear 50 rotates by the internal gear portion 50' of the clutch sleeve 52, and the forward external gear 50
Meshes with the gear 56 fixed to the shaft A to rotate the shaft A,
A gear 57 fixed to the shaft B meshes with a gear 58 fixed to the shaft B to rotate the shaft B, and a pinion gear 59 fixed to the shaft B meshes with a drive gear 60 fixed to the drive shaft C to form the drive shaft C. The drive sprocket 61 is fixed to the left and right ends of the drive shaft C by rotating
Causes the traveling vehicle 1 to move forward.

Further, at the time of retreat, the shift lever 54 is moved to the right to engage the internal gear 51 'of the clutch sleeve 52 with the left end of the retreat external gear 51, and the rotation of the input shaft 10' causes the clutch sleeve 52 to rotate. The gear 6 in which the retreating external gear 51 is fixed to the shaft B by the internal gear portion 51 ′ of the clutch sleeve 52.
The pinion gear 59 fixed to the shaft B rotates the drive gear 60 so that the drive shaft C rotates in the opposite direction to the normal state, thereby causing the traveling vehicle 1 to retreat.

The right end of the forward external gear 50, the left end of the reverse external gear 51, and the internal gear 50 'of the clutch sleeve 52.
-The shape of the gear portion 51 'is formed as a dog clutch gear shape that is easily engaged and disengaged as a clutch.

The switching device 11 will be described.

The base of a crank-shaped shift arm 64 is pivotally mounted on the rear part of the case body 48, and the tip 64 ′ of the crank portion of the shift arm 64 abuts against the groove wall side surface of the groove recess 54 ′ provided on the shift lever 54. The base of the shift arm 64 protrudes rearward, the base of the lever 65 is fixed to the protruding shaft end, and the tip of the lever 65 is pulled upward to rotate the protruding shaft end clockwise. When moved, the tip 64 'of the shift arm 64 presses against the side of the groove wall of the shift lever 54, and the shift lever 54 slides rightward on the shift shaft 53 against the pressing of the spring 55 to move the clutch sleeve 52 to the right. The internal gear portion 50 'is separated from the forward external gear 50, and the internal gear portion 51' is configured to mesh with the reverse external gear 51.

Cut below the guide wheel 33 of the bracket 31
The guide wheel 47 for the switching lever is fixed, and the reversing flexible wire 66 for moving the gear of the drive transmission mechanism 10 is connected to the tip of the lever 65. The tip of the flexible wire 66 is connected to the arm support 15, Arm 4, guide wheel
47 stretched via, mission its tip clevis-shaped
And fixed to the base of the down switching lever 67, operation pedal 6 is provided so that the pin 68 in a state of neutral i.e. upright is set at the tip in tension of the elongated hole 67 '.

Since the present embodiment is constructed as described above, when the operation pedal 6 is folded forward as shown in FIG. 3, the pin 28 rotates clockwise about the bearing of the bracket 27 as an axis.
The forward lever 29 and the reverse lever 30 rotate clockwise,
The forward link 41 is pulled rightward by the pin 43 of the forward lever 29, and the wire end 40 is moved rightward by the pin 40 '. The flexible wire 32 causes the lever 38 to move counterclockwise with the pin shaft 37 as the axis. rotates in a direction, the tension pool 8 is pressed against the running drive belt 7 the power of the engine 34 is transmitted to the driven pulley 35 via the drive transmission mechanism 10, the drive shaft C is rotating traveling vehicle 1 is advanced .

At this time, the retreat lever 30 also rotates clockwise at the same time, but when the pin 44 rotates, the retreat lever 30 rotates in a direction in which the distance between the pin 40 'and the pin 44 of the wire end 40 is reduced. The pin 40 ′ slides into the long hole 42 ′ of the use link 42, and is not involved in the transmission of the force to the flexible wire 32 by the retreat link 42.

Further, the transmission switching lever 46 also simultaneously rotates in the clockwise direction, but flexible wire retracted
Since the pin 68 moves in the direction in which the 66 is loosened and the lever 65 keeps the normal state, the traveling vehicle 1 continues to move forward.

When the operating pedal 6 is returned to the neutral or upright position, the forward lever 29 and the backward lever 30 return to their original positions, the lever 38 returns, and the tension pulley 8 presses the traveling drive belt 7. Is released, the power of the engine 34 is not transmitted to the driven pulley 36 and the traveling of the traveling vehicle 1 is stopped.

The transmission switching lever 46 also returns at the same time, but only sets the retractable flexible wire 66 in a tensioned state, and does not rotate the lever 65.

When the operating pedal 6 is lowered backward, the forward lever 29 and the backward lever 30 rotate counterclockwise as shown in FIG. 4, and the backward link 42 is moved by the pin 44 of the backward lever 30.
Is pulled to the right, and the wire end 40 is moved to the right by the pin 40 ′, so that the lever 38 is rotated counterclockwise by the flexible wire 32, and the input shaft 10 of the transmission mechanism 10 is moved by the tension pulley 8. 'Rotate. At the same time, the transmission switching lever 46 rotates counterclockwise and moves in the direction in which the retractable flexible wire 66 is pulled by the pin 68, so that the tip of the lever 65 is rotated clockwise, and the shift arm 64, the shift lever 54 As a result, the internal gear portion 50 ′ of the clutch sleeve 52
0, the internal gear portion 51 'meshes with the retreating external gear 51,
The drive shaft C rotates in the direction opposite to the direction in which the vehicle travels forward, and moves the traveling vehicle 1 backward. At this time, the forward lever 29 also rotates in the same manner, but since the pin 43 rotates in the direction in which the distance between the pin 40 'and the pin 43 of the wire end 40 decreases, the long hole of the forward link 41
The pin 40 'slides into the 41', and is not involved in transmitting the force to the flexible wire 32 by the forward link 42. still,
In the figure, reference numeral 69 denotes a steering lever of the traveling vehicle 1.

[0033]

According to the present invention, as described above, the rear part of the traveling vehicle 1 is provided.
The arm support 2 is erected on the arm support 2
Raising and lowering arm 4 which is raised and lowered by operation of cylinder device 3
A work table 5 is attached to the tip of the
An operation pedal 6 is rotatably provided on a worktable 5 of the
Petal 6 with forward lever 29, reverse lever 30 and mission
Protruding lever 46 for operating and switching to lever 29 for forward movement
Forward link 41 that operates only in one direction of rotation of petal 6
And the reverse lever 30 and the mission switching lever 46
Reversing link 42 and mission only actuating in the direction of rotation
A switching link 67 is separately provided, and one of the operation petals 6 is provided.
Actuation is transmitted via the forward link 41 by the downward rotation
A tension pad installed on the traveling drive belt 7 by the mechanism 9
The traveling vehicle 1 is driven forward by pressing the tool 8 against the traveling drive belt 7.
Through the retraction link 42 by the downward rotation to the other side.
Then, the driving belt is driven by the operation transmitting mechanism 9 as described above.
At the same time as pressing the tension pulley 8 to 7
Driven by the switching device 11 via the switching link 67
Drive gear by moving the gears of the transmission mechanism 10
The traveling rotation of the traveling vehicle 1 is made by reversing the output rotation of the mechanism 10.
Since there is provided Mel so, losses in one direction of a single operation petal
With the operation transmission mechanism via the forward link by the downward rotation
A single tension pulley opposed to the traveling drive belt 7
The output rotation of the drive transmission mechanism is pressed against the traveling drive belt.
Rolls the running vehicle forward and moves the operating petal in the other direction.
As described above via the retraction link
Tension pulley to travel drive belt by operation transmission mechanism
And at the same time via the mission switching link
To move the gear of the drive transmission mechanism by the switching device
At least reverse the output rotation of the drive transmission mechanism 10
The structure is simple because the traveling vehicle is set back.
There while operations demonstrate the easy and your operating without Xiu the effect
It becomes a control device of a lift work vehicle that can be used.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of the configuration of the present embodiment, which is partially cut away.

FIG. 2 is an explanatory diagram showing a neutral state of the operation pedal.

FIG. 3 is an explanatory diagram showing a state when the operating pedal is turned up and down (turned up and down in the forward direction).

FIG. 4 is an explanatory diagram showing a state when the operation pedal is turned up and down backward (up and down rotation in a backward direction).

FIG. 5 is a partially cutaway side view showing a main part of the transmission mechanism.

FIG. 6 is an explanatory perspective view showing a switching device mechanism of a transmission mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Traveling vehicle 2 Arm support part 3 Hydraulic cylinder device 4 Undulating arm 5 Work table 6 Operation pedal 7 Traveling drive belt 8 Tension pulley 9 Operation transmission mechanism 10 Drive transmission mechanism 11 Switching device 29 Forward lever 30 Reverse lever 42 Reverse link 46 Mission switching lever 67 Mission switching link

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60P 3/14 F16H 63/10 G05G 9/00

Claims (1)

(57) [Claims] 1. An arm support is provided at the rear of a traveling vehicle,
The arm support is provided with an up-and-down arm which is raised and lowered by the operation of a hydraulic cylinder device, a worktable is provided at the tip of the up-and-down arm, and an operation pedal is rotatably provided on the worktable. And retraction lever and
Protruding the lever for switching the
Forward link that operates only in one direction of rotation of the petal
And the other to the reversing lever and the mission switching lever
Reverse link and mission disconnection that operate only in the turning direction
Replacement links are separately provided, and the operation pulley is pressed against the traveling drive belt by the operation transmission mechanism via the forward link by falling and rotating to one side of the operating petal, and the traveling vehicle is moved forward. travel allowed, driven by outright <br/> engineering device via the simultaneous transmission changeover link when presses the tension pulley to travel drive belt by actuation transmission mechanism similar to the above through the backward link by lodging rotation to the other Move the gears of the transmission mechanism
Lift work vehicle steering apparatus characterized by comprising that allowed to reverse travel the vehicle by reversing the output rotation of the drive transmission mechanism Te.