JP2597966Y2 - Deceleration 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 decelerator.

[0002]

2. Description of the Related Art Conventionally, in a construction machine such as a hydraulic excavator, the engine rotation is set to an idling state when the load is reduced while no work or running is performed, and the engine rotation is immediately returned to the original set rotation at the start of the work or running. Some devices include a deceleration device so that unnecessary fuel consumption and noise can be suppressed.

FIG. 6 shows an example of a conventional deceleration apparatus. In the figure, reference numeral 1 denotes a throttle lever provided in a cab of a construction machine, and 2 denotes a control lever for adjusting the engine speed. The throttle lever 1 and the control lever 2 are connected by pull cables 4 and 5 which are mechanically connected via a decelerator 3.

The decelerator 3 has a main lever 8 and a sub-lever 9 rotatably connected to a main body frame 6 via the same rotary shaft 7, and has one end 8a of the main lever 8 and a sub-lever 8. One end 9a of the lever 9 is connected by a tension spring 10,
A stopper 11 projecting from the other end 9b of the sub-lever 9 by the urging force of the tension spring 10 makes the other end 8 of the main lever 8 move.
b, the levers 8 and 9 are always rotated integrally. The other end 9b of the sub-lever 9 has a first pull cable 4 connected to the throttle lever 1 at one end. The other end of the second pull cable 5 having one end connected to the control lever 2 of the engine 12 is connected to the other end 8b of the main lever 8.

Further, a small hydraulic cylinder 13 operable by a switch or a knob provided in a driver's cab is provided at a required position of the main body frame 6, and is provided at a required position of the main lever 8. The main lever 8 can be turned against the urging force of the tension spring 10 by extending and pressing the pressing rod 15 of the hydraulic cylinder 13 against the contact portion 14.

The pressing rod 1 of the hydraulic cylinder 13
When the main lever 8 and the sub-lever 9 are rotated integrally with each other by pulling in the control lever 2, the control lever 2 is rotated following the rotation of the throttle lever 1 and the engine 12 is rotated.
Is increased to the required value required for work and traveling.

The pressing rod 15 of the hydraulic cylinder 13
Is extended to press the contact portion 14 of the main lever 8 and rotate only the main lever 8 against the urging force of the tension spring 10.
The control lever 2 is returned to the idling position independently of the throttle lever 1, and the rotation speed of the engine 12 is reduced to the idling state. At this time, the auxiliary lever 9 also exerts a rotating force, but is held by the friction plate built in the throttle lever 1.

In such a state, the pressing rod 15 of the hydraulic cylinder 13 is retracted again to move the main lever 8 to the tension spring 10.
When the control lever 2 is returned to the position where it overlaps with the sub-lever 9 by the urging force, the control lever 2 is returned to the original position defined by the throttle lever 1, and the rotation speed of the engine 12 is returned to the original set rotation.

[0009]

However, in the above-mentioned conventional decelerator 3, the main lever 8 and the sub lever 9 are not provided.
Are locked by the stopper 11 and are integrated by the urging force of the tension spring 10.
Strong tension spring 10 so that secure integration of 9 can be achieved.
Is required, and such a strong tension spring 1
Since the main lever 8 must be turned against the urging force of 0, the pressing force by the hydraulic cylinder 13 is inevitably increased, so that a large load is repeatedly applied to the stopper 11 and the contact portion 14. Therefore, there is a possibility that the stopper 11 and the contact portion 14 may be damaged in a short time.

The present invention has been made in view of the above circumstances, and has as its object to provide a decell apparatus which can be used satisfactorily for a long period without causing damage in a short period.

[0011]

According to a first aspect of the present invention, an end of a main lever is pivotally attached to a main body frame via a first pivot shaft, and the main lever is pivotally connected to the main frame. A longitudinal intermediate portion of the sub-lever is pivotally connected to a longitudinal intermediate portion of the lever via a second pivot shaft so that the main lever and the other end of the sub-lever are connected to one end of the sub-lever. The other end of the first pull cable having a slit formed so that an arc shape centered on the first rotation axis is formed at least partially when superimposed, and one end connected to a throttle lever Is connected to the other end of the main lever, and the other end of the second pull cable, one end of which is connected to the control lever of the engine, is connected to the other end of the sub lever, and slides into the slit of the sub lever. The auxiliary lever is free to engage the engagement pin with the second pivot axis. The present invention relates to a decelerating device characterized in that an actuator which double-acts so as to be rotated is provided on the main body frame. Is a double-acting electric motor reciprocatingly rotating within a required angle range on an arc track concentric with the first rotating shaft.

[0012]

Therefore, in the present invention, if the position of the engaging pin is fixed by the actuator in a state where the other end portions of the main lever and the sub lever are overlapped with each other, the second rotation axis of the sub lever is used as a fulcrum. Since the rotation with respect to the main lever is prevented by the engaging pin, the overlapping state of the two levers is not released unless the fixing position of the engaging pin is changed, and the sub-lever is allowed by the slit. Only the rotation that is integral with the main lever about one rotation axis is possible.

When the throttle lever is rotated in such a state, the main lever is rotated via the first pull cable,
In addition, since the sub-lever is also rotated following the main lever, the control lever is rotated via the second pull cable, and the number of revolutions of the engine is set to a required value required for work and traveling. Can be adjusted.

In addition, when the load is reduced during which the operation or running is temporarily interrupted, the actuator is driven to move the engagement pin to rotate the sub-lever about the second rotation axis.
The auxiliary lever is easily released from the state of being overlapped with the main lever, the control lever is returned to the idle position independently of the throttle lever via the second pull cable, and the engine speed is reduced to the idle state.

Further, when starting work or running from such a state, when the actuator is driven to return the engagement pin to the original position, the sub-lever is connected to the main lever about the second rotation axis. The control lever is returned to the original position defined by the throttle lever via the second pull cable, and the engine speed is returned to the original set rotation via the second pull cable.

If a double-acting electric motor is used as the actuator that double-acts the engagement pin, a hydraulic circuit that is required when a conventional hydraulic cylinder is used can be eliminated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment of the decelerating device according to the present invention. In the following description, FIG. 3 is described with the left side as the front side and the right side as the back side as viewed from the right side. I do.

In the figure, reference numeral 16 denotes a main body frame of a decelerator 17 fixed to a required position of a construction machine such as a hydraulic shovel, and a bracket 16a formed on the main body frame 16 is provided.
One end 18a of a main lever 18 is rotatably mounted on the front side of the main lever 18 via a first rotation shaft 20.
On the back side of the middle part in the longitudinal direction of FIG. 8, a middle part in the longitudinal direction of the sub-lever 19 is rotatably pivotally connected via a second rotation shaft 21. One end 19a of the sub-lever 19 is shown in FIG. As shown in FIG. 3, it is bent and passed through a notch 22 formed in the bracket portion 16a, and is disposed on the back surface of the bracket portion 16a.

Further, the main lever 18 and the other end portions 18b and 19 of the sub lever 19 are provided at one end portion 19a of the sub lever 19, respectively.
A slit 23 (see FIG. 4) is formed so that an arc shape centered on the first rotating shaft 20 is formed at least partially when the b is superimposed.

The other end 18b of the main lever 18 is connected to the other end of the first pull cable 4 having one end connected to the throttle lever 1, and the other end 19b of the sub lever 19 is connected. Is connected to the other end of the second pull cable 5 having one end connected to the control lever 2 of the engine 12.

Further, a double-acting electric motor 26 (actuator) driven by a switch 25 provided at the upper end of an operating lever 24 in the cab is first rotated on the back side surface of the bracket portion 16a of the main body frame 16. An output shaft 27 is arranged and mounted concentrically with the shaft 20, and an engagement pin slidably engaged with the slit 23 of the sub-lever 19 is attached to the output shaft 27 of the double-acting electric motor 26. 28 is provided via a cam member 29, and the sub-lever 19 is rotated about the second rotation shaft 21 by reciprocatingly rotating the engagement pin 28 within a required angle range. .

With the other end portions 18b and 19b of the main lever 18 and the sub lever 19 being overlapped with each other,
If the position 8 is fixed by the double-acting electric motor 26, the rotation of the sub-lever 19 with respect to the main lever 18 with the second rotation shaft 21 as a fulcrum is prevented by the engagement pin 28. Unless the fixing position of the engaging pin 28 is changed, the overlapping state of the levers 18 and 19 is not released, and the sub-lever 19 is provided with the first pivot shaft 20 supported by the slit 23 as a fulcrum. Only the rotation that is integral with the lever 18 is enabled.

When the throttle lever 1 is rotated in such a state, the main lever 18 is rotated via the first pull cable 4 and the sub-lever 19 is also rotated integrally with the main lever 18. Therefore, the control lever 2 is rotated via the second pull cable 5, and the rotation speed of the engine 12 can be arbitrarily adjusted to a required value required for work or traveling.

In addition, when the load is reduced due to a temporary interruption of work or running, the switch 25 of the operating lever 24 is operated in the cab.
Is operated to drive the double-acting electric motor 26 so that the engagement pin 2
When the lever 8 is rotated clockwise by a predetermined angle as shown in FIG. 5, the auxiliary lever 19 is forcibly released from the state of being overlapped with the main lever 18 and is rotated about the second rotation shaft 21 so that the second lever 19 is rotated. The control lever 2 is returned to the idling position independently of the throttle lever 1 via the pull cable 5, and the rotation speed of the engine 12 is reduced to the idling state.

Further, when work or traveling is started from such a state, the switch 25 of the operating lever 24 is operated in the cab to drive the double-acting electric motor 26 and the engaging pin 28
Is rotated counterclockwise to return to the original position,
Reference numeral 9 is rotated about the second rotation shaft 21 to a position where it overlaps the main lever 18, and the control lever 2 is returned to the original position defined by the throttle lever 1 via the second pull cable 5. , The rotation speed of the engine 12 is returned to the original set rotation speed.

Therefore, according to the above embodiment, the main lever 18
There is no need to apply an urging force between the lever 18 and the auxiliary lever 19 by a tension spring or the like, and the two levers 18 and 19 can be rotated extremely easily only by fixing the position of the engaging pin 28. And the auxiliary lever 1 with respect to the main lever 18
The independent rotation of 9 can be easily performed simply by rotating the position of the engagement pin 28 by the double-acting electric motor 26, so that the main lever 18 and the sub lever 19 are not damaged in a short time, The decelerator 17 can be used favorably over a long period.

Further, if a double-acting electric motor 26 is employed as an actuator for double-acting the engagement pin 28 as in this embodiment, a hydraulic circuit required when a conventional hydraulic cylinder is employed becomes unnecessary. The operation system can be significantly simplified.

It should be noted that the decelerator of the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

[0030]

According to the decelerator of the present invention,
Various excellent effects as described below can be obtained.

(I) The main lever and the sub-lever can be pivoted together very easily only by fixing the position of the engagement pin. Since the position can be easily adjusted simply by moving the position by the actuator, the main lever and the auxiliary lever are not damaged in a short period of time, and the decelerator can be used favorably for a long period of time.

(II) If a double-acting electric motor is used as the actuator that double-acts the engagement pin, a hydraulic circuit required when a conventional hydraulic cylinder is used can be omitted, and the operation system can be simplified. It can be significantly simplified.

[Brief description of the drawings]

FIG. 1 is a schematic overall view showing one embodiment of the present invention.

FIG. 2 is a front view showing details of the decell device of FIG. 1;

FIG. 3 is a view in the direction of arrows III-III in FIG. 2;

FIG. 4 is an arrow view (not shown) of a main body frame in the IV-IV direction of FIG. 3;

FIG. 5 is a view showing a state in which the sub-lever of FIG. 4 is rotated around a second rotation axis.

FIG. 6 is a schematic overall view showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 throttle lever 2 control lever 4 first pull cable 5 second pull cable 12 engine 16 main body frame 17 deceleration device 18 main lever 18a one end 18b other end 19 sub lever 19a one end 19b other end 20 first Rotating shaft 21 Second rotating shaft 23 Slit 26 Double-acting electric motor (actuator) 28 Engagement pin

Claims (2)

(57) [Scope of request for utility model registration] An end of a main lever is pivotally attached to a main body frame via a first rotation shaft, and a longitudinal middle portion of a sub-lever is provided at a longitudinal middle portion of the main lever. It is pivotally attached via two pivot shafts, and when the other end of the main lever and the other end of the sub-lever are overlapped with one end of the sub-lever, about the first pivot shaft. The other end of the first pull cable having one end connected to the throttle lever is connected to the other end of the main lever, and a slit is formed so that the arc shape is formed at least partially. The other end of the second pull cable having one end connected to the lever is connected to the other end of the sub-lever, and the sub-lever has an engagement pin slidably engaged with the slit of the sub-lever. In front of an actuator that double-acts so that it is A deceleration device provided on the main body frame. 2. The decelerator device according to claim 1, wherein the actuator is a double-acting electric motor that reciprocally rotates the engagement pin within a required angle range on a circular orbit concentric with the first rotation axis.