JPH0530942B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating lever device for switching an oil passage of an oil passage switching valve.

Many oil passage switching valves are used in construction machinery such as cranes, excavators, and shovels that operate actuators using hydraulic pressure. In addition to switching the oil path of the oil path switching valve, it also has another function, for example, after switching the oil path switching valve, accelerate the engine that drives the pump to increase the pump rotation speed and pump discharge. increase the flow rate and increase the speed of the actuator, or after switching the oil passage switching valve, switch another oil passage switching valve to merge other pressure oils and increase the speed of the actuator. It would be desirable if the pressure in the circuit could be controlled by operating a pressure control valve or the like after switching.

By the way, by moving the operating lever further in the same operating direction after switching with the oil passage switching valve operating lever, the accelerator of the engine that drives the pump is increased, increasing the rotational speed of the pump and increasing the pump discharge amount. A prior art dual-function operating lever device configured to increase the speed of the actuator is disclosed in Japanese Patent Application Laid-open No. 116531/1983.

The operating lever device disclosed in this publication divides the operating lever into an operating part and a pivot base, and connects these parts via an elastic body made of relatively hard rubber or the like so that they can be bent relative to each other. Therefore, when the operating lever is operated in one direction, the pivot base switches the oil passage switching valve, and then the hard rubber elastic body bends, and the bent upper operating part of the operating lever operates the accelerator drive operating piece. It is configured to perform an accelerator acceleration operation. However, with this configuration, the bending direction of the operating lever is not constant due to the bending direction of the rubber-like elastic body, and there is a problem that it is difficult to reliably operate the accelerator drive operating piece using the operating section. , the rubber-like elastic body bends from the time when the operation lever starts to be operated, and depending on the variation in the quality of the rubber-like elastic body, the amount of bending at the completion of the switching operation of the switching valve may vary, and the next accelerator drive operation There is a problem in that the reliability of the timing is lost.

The present invention eliminates the above-mentioned problems and provides a dual-function operating lever device in which the switching operation of the oil passage switching valve and other operations such as accelerator drive operation can be clearly distinguished and performed reliably. The purpose is to

The present invention provides an operating lever arm 1 as shown in FIG.
2 is integrated with the operating lever 7 whose pivot pin 4
After the oil passage switching spool 2 of the oil passage switching valve 1 is operated to switch the oil passage of the oil passage switching valve 1, the operating lever is further rotated around the pivot pin. In the dual-function operating lever device in which the operating lever is configured to perform operations other than the oil passage switching operation, the oil passage switching lever arm 3 is pivotally supported on the pivot pin 4. , one end of this lever arm 3 is engaged with a pin 6 provided on the oil passage switching spool 2, a bush 10 is slidably attached to the operating lever 7, and one end of this bush 10 abuts. Abutment part 1
5 is provided in the oil passage switching lever arm 3, and a groove hole is provided in the abutting portion 15 so that the operating lever 7 can swing around the pivot pin 4 relative to the oil passage switching lever arm 3. 16 is penetrated by the operating lever 7, and a spring 9 is inserted between the bushing 10 and a stopper member 11 screwed onto the operating lever 7, and the bushing 10 is pressed against the abutting portion 15 of the lever arm 3 by the spring force. By being crimped, the oil passage switching lever arm 3 is integrally connected to the operating lever 7, whereby the oil passage switching lever arm 3 is rotated together with the operating lever 7 around the pivot pin 4, thereby opening the oil passage switching valve. After the movement of the oil passage switching lever arm 3 is fixed at the stop position where the oil passage is switched, the operating lever 7 can further rotate around the pivot pin 4 against the spring force. It is characterized in that other operations are performed.

According to the present invention, with the above-described configuration, by operating the operating lever 7 in the direction A or D from the neutral position of the oil passage switching valve 1 shown in Fig. 2C, As shown in FIG.
As a result, the spool 2 of the hydraulic switching valve 1, which is connected to the arm end of the lever arm 3 via a pin 6, is moved to the oil path switching position shown in FIG. It will be done. Since the spool 2 has reached the end of its travel at this oil path switching position, the movement of the spool 2 is stopped, and therefore,
The rotation of the oil passage switching lever arm 3 is also stopped, and the movement of this lever arm 3 is fixed at the oil passage switching position.

Subsequently, when the operating lever 7 is operated and a force greater than the initial setting force is applied to the spring 9, the spring 9 is deflected, causing only the operating lever 7 to further rotate around the pivot pin 4 against the spring force. In other words, the operating lever 7 is rotated relative to the oil passage switching lever arm 3 fixed at the oil passage switching position, and the operating lever 7 is in the state shown in Fig. 1 A or E. An operation lever arm 12 formed integrally with the accelerator pedal 7 performs operations such as increasing the accelerator speed.

According to the present invention, the oil passage switching lever arm that operates the spool of the oil passage switching valve and the operating lever that operates this lever arm are pivoted on the same pivot pin, and the operating lever and the oil passage switching lever arm are pivoted on the same pivot pin. are integrally connected by a spring force, and the operating lever is configured to rotate integrally with and relative to the oil passage switching lever arm around a pivot pin by the initial setting force of the spring. In particular, if an initial setting force is applied to the spring in accordance with the operating force of the oil passage switching valve when the spring is installed, the switching operation of the oil passage switching valve can be performed within the range of the initial setting force of the spring. and other operations such as accelerator drive operation can be clearly distinguished and performed reliably.

Further, according to the present invention, since the initial setting force of the spring can be adjusted by the adjustable stop member 11, the present invention can be easily applied to various switching valves that require different operating forces.

Furthermore, by appropriately selecting and using a spring having a predetermined spring constant, it is possible to change the slope of the straight line a representing the spring characteristics in the accelerator drive operation area A shown in FIG. When the inclination is increased, the accelerator drive operation area becomes narrower, but the accelerator drive operation can be controlled appropriately, such as by making it possible to perform the accelerator drive operation with a small operating force.

Embodiments of the invention will be described with reference to the drawings.

FIG. 1 shows one embodiment of the present invention, and in the illustrated example, a bell crank-shaped operating lever 17, in which an operating lever arm 12 extending perpendicularly to the operating lever 7 is integrally formed, is positioned at its pivot point. It is pivoted to a fixed part adjacent to the protruding end of the oil passage switching spool 2 of the oil passage switching valve 1, and a handle 8 is attached to the end of the operating lever 7.
is installed.

The pivot pin 4 also pivotally supports an oil passage switching lever arm 3, a recess 5 is provided at one end of the lever arm 3, and the recess 5 is engaged with a pin 6 protruding from the projecting end of the spool 2. One end of the oil passage switching lever arm 3 is connected to the spool 2 with a pin.

A bush 10 is slidably attached to the operating lever 7, and an abutment portion 15 with which the large diameter end of the bush 10 abuts is provided on the oil path switching lever 3.
A slot 16 extending in a direction perpendicular to the axis of the pivot pin 4 is provided in the pivot pin 4, and the pivot end portion of the operating lever 7 is passed through the slot 16 to connect the abutting portion 15 and the operating lever arm 1.
2 are spaced apart from each other by an appropriate distance, so that the operating lever 7 can swing around the pivot pin 4 relative to the oil passage switching lever arm 3.

A spring 9 is connected between the large diameter end of the bush 10 and an adjustable stopper 11 screwed onto the operating lever 7.
is inserted, and the large-diameter abutting end of the bush 10 is pressed against the abutting portion 15 of the oil passage switching lever arm 3, thereby integrally connecting the lever arm 3 to the operating lever 7 by a spring force. As described above, the operating lever arm 12, which is integrally formed with the operating lever 7, is connected via a ring 17 to an accelerator of an engine for driving a hydraulic pump.

According to the above-mentioned configuration, when the operating force applied to the handle 8 is weakened in the state shown in Figs. 2A and 2E in FIG. do. (Figures B and D). In this state, if the operating lever 7 is rotated further, it will return to the neutral position (Fig. You can return to the neutral position on your own by simply letting go.

FIG. 3 shows one application example of the operating lever device shown in FIG. 1, in which the speed of the actuator is increased by accelerating the engine that drives the pump after switching the oil passage switching valve 1. In the figure, reference numeral 13 indicates an actuating member that transmits the movement of the operating lever arm 12 to the accelerator side. First, the oil passage switching valve 1 in the neutral position is switched by rotating the operating lever 7, and then the operating member 13 is switched over by rotating the operating lever 7. When the lever arm 12 rotates further, the operating lever arm 12 starts to come into contact with the actuating member 13.
The speed of the crane, etc. can be increased by gradually accelerating the pump to increase the discharge flow rate of the pump.

According to the present invention, as described above, the operating lever and the oil passage switching lever arm are pivoted on the same pivot pin, and the operating lever is connected to the oil passage around the pivot pin by a spring force. The operation lever is rotated together with the switching lever arm, and the operating lever is configured to rotate relative to the oil passage switching lever arm against a spring force around a pivot pin. The direction of the oil passage switching operation using the lever and the operating direction of other operations such as the accelerator operation are the same, and the initial setting force of the spring clearly distinguishes the oil passage switching operation from other operations such as the accelerator operation. This can be done reliably, and by adjusting the initial setting force of the spring, it can be easily applied to various oil passage switching valves that require different operating forces.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a part of the operating lever device according to the present invention as a cross section, FIG. 2 is an explanatory diagram of the operation of the operating lever device shown in FIG. 1, and FIG. 3 is an explanatory diagram of an application example of the operating lever device. , FIG. 4 is a graph showing the relationship between the operating force and the displacement amount of the spring in the operating lever device according to the present invention. DESCRIPTION OF SYMBOLS 1... Oil passage switching valve, 2... Spool, 3... Oil passage switching lever arm, 7... Operating lever, 8... Handle, 9... Spring, 10... Bush, 11
... Stopping member, 12 ... Operation lever arm, 15 ...
Abutting portion, 16...Slot hole.

Claims (1)

[Claims] 1 The operating lever 7 having the operating lever arm 12 integrally is rotated around its pivot pin 4, and the oil passage switching spool 2 of the oil passage switching valve 1 is operated to switch the oil passage of the oil passage switching valve 1. In the dual-function operating lever device, the operating lever is configured to perform operations other than the oil passage switching operation by further rotating the operating lever around a pivot pin after the switching operation. , an oil passage switching lever arm 3 is pivotally supported on the pivot pin 4, one end of this lever arm 3 is engaged with a pin 6 provided on the oil passage switching spool 2, and a bush 10 is attached to the operating lever 7. is slidably attached to the oil passage switching lever arm 3, and an abutting portion 15 with which one end of this bush 10 abuts is provided on the oil passage switching lever arm 3. The operating lever 7 is passed through a slot 16 provided in the abutting portion 15 so as to be able to swing relative to the operating lever 7, and a spring 9 is interposed between the bush 10 and a stop member 11 screwed onto the operating lever 7. inserted,
The bush 10 is pressed against the abutting portion 15 of the lever arm 3 by a spring force, and the oil passage switching lever arm 3 is integrally connected to the operating lever 7. After the movement of the oil passage switching lever arm 3 is fixed at the stop position where the oil passage switching valve is rotated together with the operating lever 7 to switch the oil passage of the oil passage switching valve, the operating lever 7 pivots against the spring force. An operating lever device having two functions, which is further rotatable around a support pin 4 and allows other operations to be performed using an operating lever 7.