JP2531296Y2 - Operating lever device for hydraulic system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a hydraulic device, in particular, an engine whose engine speed can be controlled by an accelerator control mechanism, and hydraulic oil discharged by a hydraulic pump driven by the engine. The present invention relates to an operation lever device used for a hydraulic device including a hydraulic control valve for controlling supply / discharge of an actuator for driving a working machine.

(Prior Art) The engine comprises an engine whose engine speed can be controlled by an accelerator control mechanism, and a hydraulic control valve for controlling supply and discharge of hydraulic oil discharged from a hydraulic pump driven by the engine to an actuator for driving a work machine. 2. Description of the Related Art Hydraulic devices are widely used as driving devices for driving working machines such as mobile cranes and aerial work vehicles. When driving a working machine with this type of hydraulic device, the operator must operate the hydraulic control valve to supply hydraulic oil to the working machine driving actuator and operate the accelerator control mechanism to increase the engine speed. However, complicated operations were required.

Therefore, as shown in Japanese Utility Model Laid-Open No. 62-93220, an operation lever device has been put to practical use in which an accelerator control mechanism is automatically operated in conjunction with operation of an operation lever for switching a hydraulic control valve. Was.

The above-mentioned operation lever device will be specifically described with reference to FIG. 4. A substantially triangular cam C is mounted on an operation lever B for switching the hydraulic control valve A, and the operation of rotating the operation lever B is performed by the cam. The displacement of the roller D which comes into contact with C is taken out via the link E and the cable, and the displacement is transmitted to the accelerator control mechanism F of the engine so as to increase the engine speed.

(Problems of the prior art) However, the operation lever device configured as described above has a problem that the structure is complicated and the cost is high because the cam C and the roller D are required. Further, since the cam C and the roller D are relatively large and rotate in conjunction with the operation of the operation lever B, the space required for operating the operation lever is large and cannot be used for a small work machine. There was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an operation lever device that has a simple structure and requires a small operating space during operation.

(Means for Solving the Problems) In order to achieve the above object, the operating lever device of the hydraulic device of the present invention is pivotally supported on a rotating shaft so as to swing the hydraulic control valve by manual operation of an operating knob. An operation lever for switching control, and a rotation shaft erected at a position separated from the rotation shaft of the operation lever by a predetermined amount so as to be pivotally supported at the center thereof so as to swing the accelerator control mechanism by the engine. An oscillating link that operates in a direction in which the rotational speed increases, and is erected at an appropriate position of the operating lever, and is engaged with one end of the oscillating link by rotating the operating lever in one direction to rotate the oscillating link into an engine. The first engaging piece that rotates in the direction in which the number rises and the operating lever that is erected at an appropriate position are engaged with the other end of the swing link by rotating the operating lever in the other direction. Turn the link in the direction to increase the engine speed. Second to move
And the engagement pieces of the above.

(Operation) In the operation lever device of the present invention configured as described above, by operating the operation lever in one direction, the first engagement piece erected on the operation lever engages one end of the swing link. By rotating the swing link in the direction in which the engine speed increases, and operating the operation lever in the other direction,
A second engagement piece erected on the operation lever is engaged with the other end of the swing link to rotate the swing link in a direction in which the engine speed increases. Therefore, the accelerator control mechanism is operated so as to increase the engine speed regardless of which direction the operating lever is operated, so that the engine speed is automatically set higher.

The operating lever device of the present invention is configured so that the swing link for operating the accelerator control mechanism is directly rotated by the first engaging piece and the second engaging piece provided on the operating lever. This eliminates the need for the cams and rollers required for the conventional operation lever device, simplifies the structure, is inexpensive, and enables installation in a small space.

(Embodiment) Hereinafter, an embodiment of the operation rehearsal device of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a base of a working machine such as a crane or an aerial work vehicle. Reference numeral 2 denotes a hydraulic control valve for controlling the supply and discharge of hydraulic oil discharged from a hydraulic pump 3 driven by an engine to be described later to an actuator (not shown) for driving the working machine. The hydraulic control valve 2 is slidably spooled on the valve body 2a.
2b is provided, and the direction and the flow rate of the pressure oil are controlled by switching the sliding of the spool 2b to drive the hydraulic actuator. Reference numeral 4 denotes an engine for driving the hydraulic pump 3, and reference numeral 5 denotes a conventionally known accelerator control mechanism for controlling the engine speed of the engine 4. The accelerator control mechanism 5 increases the engine speed by operating the accelerator lever 5a from the low-speed position L to the high-speed position H, and decreases the engine speed by operating the accelerator lever 5a in the low-speed position L. ing.

Reference numeral 6 denotes an operation lever device that operates the hydraulic control valve 2 and the accelerator control mechanism 5. The operating lever device 6 is pivotally supported by a rotating shaft 8 erected on a bracket 7 so as to be swingable, and switches the hydraulic control valve 2 by manual operation of an operating knob 9 in directions A and B. 10 and
A pivot shaft 11 erected at a position separated from the pivot shaft 8 of the operation lever 10 by a predetermined amount on the bracket 7 has a central portion.
12 is pivotally supported so that the engine 4
A swing link 13 for operating the accelerator control mechanism 5 in a direction in which the engine speed increases, and is provided at one end of the swing link 13 by being erected at an appropriate position of the operation lever 10 and rotated in the A direction of the operation lever 10. The first engaging piece 14 which engages and rotates the swinging link 13 in the C direction and the operating link 10 which is erected at an appropriate position on the operating lever 10 in the B direction to rotate the swinging link 13. And a second engaging piece 15 which engages with the other end of the pivot link 13 to rotate the swing link 13 in the C direction.

The first engagement piece 14 is an L-shaped extension 10 of the operation lever 10.
a, which is erected in the vicinity of the end of the swing link 13 in the direction of the outer end with respect to the rotation shaft 11 of the swing link 13. The swing link is linked with the rotation of the operation lever 10 in the direction A. One end 13a of the lock 13 is engaged from one side to rotate the swing link 13 in the direction C, that is, the direction in which the engine speed is increased. The second engagement piece 15 is provided on the base end side of the L-shaped extension 10a of the operation lever 10, that is, the swing link 1
The other end of the swing link 13 interlocks with the rotation of the operation lever 10 in the direction B with respect to the rotation shaft 11. The swing link 13 is engaged with the other side from the other side to rotate the swing link 13 in the direction of C, that is, in the direction of increasing the engine speed in the same manner as the operation of the operation lever 10 in the direction of A.

A connecting rod 16 is connected to an appropriate position of the L-shaped extension 10a of the operating lever 10 and transmits the rotational displacement of the operating lever 10 to the spool 2a of the hydraulic control valve 2. Reference numeral 17 denotes an accelerator cable connected to an appropriate position of the swing link 13 for transmitting rotation of the swing link 13 in the direction C to an accelerator lever 5a of the accelerator control mechanism 5.

In the case of the present embodiment, the standing relationship between the first engagement piece 14 and the second engagement piece 15 and the positional relationship between the rotating shafts 8 and 11 are: l: s = L: S l: The distance between the first engagement piece 14 and the rotation axis 11 of the swing link 13 s: The distance between the second engagement piece 15 and the rotation axis 11 of the swing link 13 L: The rotation axis of the operation lever 10 The distance between the second engaging piece 15 and the first engaging piece 14 is set as S: the distance between the rotating shaft 8 of the operating lever 10 and the second engaging piece 15. With this setting, the amount of rotation of the swing lever 13 when the operation lever 10 is operated in the direction A is equal to the amount of rotation of the swing lever 13 when the operation lever 10 is operated in the direction B. This makes it possible to improve the operability by making the control feeling of the engine speed the same.

 Next, the operation will be described.

To switch the hydraulic control valve 2 to drive the work machine and increase the engine speed, the operating lever
It is sufficient to operate 10 in the A direction or the B direction.

When the operating lever 10 is operated in the direction A, the hydraulic control valve 2 is first switched to the switching position via the connecting rod 16 connected to the operating lever 10. Thereby, the hydraulic control valve 2
Controls the supply and discharge of the pressure oil discharged from the hydraulic pump 3 to an actuator (not shown) for driving the working machine to drive the working machine.

By operating the operation lever 10 in the direction A, the first engagement piece 14 is displaced in the direction a as shown by the solid line in FIG.
One end 13a of the swing link 13 is engaged from one side to rotate the swing link 13 in the C direction. The rotation of the swing link 13 in the direction C causes the accelerator cable 17 to be pulled, and the accelerator cable 17
The accelerator lever 5a of the accelerator control mechanism 5 connected to the other end is operated in the high-speed position H, whereby the engine 4 increases the engine speed and drives the work implement at high speed.

When the operating lever 10 is operated in the direction B, the second engaging piece 15 is displaced in the direction b as shown by a chain line in FIG. To rotate the swing link 13 in the C direction. The rotation of the swing link 13 in the direction C is performed by operating the accelerator lever 5a of the accelerator control mechanism 5 in the high-speed position H in the same manner as when the operation lever 10 is operated in the direction A. Is designed to increase the engine speed and drive the work machine at high speed.

(Effect) The operating lever device of the hydraulic device according to the present invention is a first operating lever having a swing link for operating an accelerator control mechanism.
Because it is configured to rotate directly by the engagement piece and the second engagement piece, the structure is simple, inexpensive, and it can be mounted in a small space. This has the effect.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating the operation lever device of the hydraulic device of the present invention, FIG. 2 is a side view thereof, FIG. 3 is an operation explanatory diagram of the operation lever device, and FIG. FIG. Accelerator control mechanism… 5, Engine… 4, Hydraulic control valve ……
2, operation lever device ... 6, rotating shaft ... 8, rotating shaft ... 11, swing link ... 13, first engagement piece ... 14, second engagement piece ...
Fifteen

Claims (1)

(57) [Scope of request for utility model registration] An engine capable of controlling an engine speed by an accelerator control mechanism, and a hydraulic control valve for controlling supply and discharge of hydraulic oil discharged from a hydraulic pump driven by the engine to an actuator for driving a work machine. An operation lever device for a hydraulic device, comprising: an operation lever pivotally supported on a rotation shaft to switch and control the hydraulic control valve by manual operation of an operation knob; and a rotation of the operation lever. A swing link that is pivotally supported at the center thereof on a rotation shaft that is erected at a predetermined distance from the drive shaft and that operates the accelerator control mechanism in a direction in which the engine speed increases by the swing. A first position of the operation lever which is set up at an appropriate position, engages one end of the swing link by turning the operation lever in one direction, and turns the swing link in a direction in which the engine speed increases. The engaging piece and the operating lever are erected at appropriate positions, and the operating lever is rotated in the other direction to engage with the other end of the oscillating link and rotate the oscillating link in a direction in which the engine speed increases. An operating lever device for a hydraulic device, comprising: a second engaging piece that is operated.