JPS58106149A - Driving control unit for reversible variable displacement type hydraulic pump - Google Patents

Abstract

PURPOSE:To achieve acceleration for a driven body with a single driving gear as well as to prevent noise from augmenting, by linking the operating lever of a hydraulic pump and the throttle lever of an engine to the driving gear selectively via a linking mechanism. CONSTITUTION:An operating lever 1 is coupled with an operating shaft 2 of the servo valve of a reversible variable displacement type hydraulic pump P, through which both the discharge direction and the discharge rate are controlled. Power transmission rods 7 and 15, a solenoid clutch 13 and an intermediate lever 14 constitute a linking mechanism and control acceleration and deceleration for an engine E via a throttle lever 16. When a driven body 6 rotates at high speed, if the solenoid clutch 13 is energized with current, the throttle lever 16 is tilted and moved in direction to acceleration via a driving lever 10, the power transmission rod 7, the solenoid clutch 13, the intermediate lever 14 and the power transmission rod 15. Doing like this, driving output can be increased while noise can be damped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive control device for a variable displacement hydraulic pump capable of changing the discharge amount and discharge direction.

Generally, the hydraulic pump is provided with an operating lever for changing and controlling the discharge amount and discharge direction of pressure oil, and by tilting the operating lever to the left or right from the middle position, the direction in which the pressure oil is discharged is adjusted. Once ＼ is determined, when the movement angle increases at around 1, the discharge amount will be capped, and when the movement angle reaches a maximum of 1, the discharge amount will reach the maximum, and when the engine speed increases, the discharge amount will also increase. configured to increase.

However, in order to reduce noise and prevent unnecessary increases in output, when the driven object is being driven at low speeds, only the aforementioned control lever is used to measure the J5 & direction, and only when driving at high speeds, the tilting angle of the nq operation levers is increased and the engine speed is increased. Although these two operations are used together, it is preferable to perform these two operations by a single driving means rather than separate driving means because it is simpler.

The present invention has been made in view of the above, and below, embodiments of the present invention will be described with reference to the drawings.
An operating lever 1 is connected to the drying shaft 2 of the servo valve of a T-type hydraulic pump P (hereinafter referred to as hydraulic pump), and the direction and amount of discharge from the hydraulic pump P are changed by tilting the operating lever 1. controlled. The input shaft of the hydraulic pump P is linked to the power take-off device PTO of the 1 liter EIJ machine E, and the discharge port of the hydraulic pump P is connected to the oil passages 6 and 4.
The hydraulic motor M is connected to the hydraulic motor M via the
The output shaft of is linked to a driven body 6 such as a drum via a reduction gear 4 (not shown). 6τ1 A spring S and a stopper 5 are interposed at the upper end of the operating lever 1! vJ rod 7
One end of the transmission rod 7 is connected to the other end of the transmission rod 7, and one end of a drive lever 10 is connected to the other end of the transmission rod 7. At the other end of the drive lever 10 is a drive device 12 such as an electric motor. By rotating the drive device 12 in the forward and reverse directions, the drive lever 10 can be tilted to the left and right from the center position N in FIG. 1.

1j11 An electromagnetic clutch 16 is interposed in the middle of the transmission rod 7, and only the electric In:" is integrated with the transmission rod 7. This electromagnetic clutch 13 is attached to the tip of the intermediate lever 14, and -)4 of a transmission rod 15 is connected in a roundabout way, and the other end of the transmission rod 15 is connected to a throttle lever 16 of the engine E.

Therefore, the transmission rods 7 and 15, the electromagnetic clutch 16, and the intermediate lever 1
4 constitutes a linked structure.

Next, I will explain the operation of the example of [unexploded LO].
Driving force: When the hydraulic pump is driven by 'A4K, the pressure oil discharged from this m11 pressure pump P is driven by the hydraulic motor M.
It is possible to drive the driven body 6, which is supplied to and driven to rotate, and to operate the driven body 6 that is interlocked therewith.

By the way, control for changing the discharge amount and discharge method of the hydraulic pump P to control the forward, reverse, increase, decrease, increase, and stop of the hydraulic motor M1, that is, the driven body 6, is performed as follows.

Now, when the operating drive device 12 of the hydraulic pump P is driven in the normal rotation direction, the drive lever 10 is swung in one direction (clockwise) from the mid-normal position rItN, and the operating lever 1 is further rotated in the normal rotation direction via the transmission rod 7. (clockwise), the driven body 6 can be driven in the normal rotation direction, and as the tilt angle of the operating lever 1 in the forward rotation direction increases, the discharge amount from the hydraulic pump P increases and the driven body 6 can be rotated in the forward direction. When the normal rotation is driven at increased speed and the tilt angle of the operating lever 1 in the normal rotation direction becomes maximum, the driven body 6 is rotated in the normal direction at the maximum speed.

Further, when the drive device 12 is reversed, the drive lever 10 is tilted in the other direction (counterclockwise) from the neutral position N, and the drive lever 10 is tilted in the other direction (counterclockwise).
By tilting the operating lever 1 in the reverse direction (counterclockwise), the driven body 6 can be driven in the reverse direction, and as the tilting angle of the operating lever 1 in the reverse direction increases, the discharge amount from the hydraulic pump P increases. The driven body 6 is then driven in reverse at an increased speed, and the operating lever 1 is
When the tilt angle becomes maximum, the driven body 6 is reversed at the maximum speed.

By the way, when controlling the tilting of the operating lever 1 of the hydraulic pump P, the tilting angle of the drive lever 10 is relatively small when the driven body B rotates at a low speed (less than about 22-5 rpm), and at this time the electromagnetic clutch 16 is de-energized. The intermediate lever 14, the transmission rod 15, and the throttle lever 16 do not follow the movement of the transmission rod 7, so the speed of the engine E is not increased.

When the driven body B rotates at high speed (approximately 2 m 5 rpm or more), the tilting angle of the drive lever 10 increases, and at this time, when the electromagnetic clutch 16 is energized, the drive lever 10
After that, as the tilting angle of the drive lever 10 increases, the electromagnetic clutch 16, intermediate lever 14, The throttle lever 16 is moved in the direction of speed increase through the transmission rod 15. FIG. One end of the transmission rod 18 is connected, and the other end is connected to the operating lever 1 of the hydraulic pump P. On the other hand, a long groove 1.9 is provided on the distal end side of the cam plate 17.

The operating lever 1 is tilted in the speed increasing direction (clockwise in Figure 2),
On the other hand, one end of the transmission rod 20 remains loosely fitted into the long groove 19, and the throttle 16 is not tilted.

When the driven body rotates at high speed, the cam plate 17 further tilts in the speed increasing direction, and from the time when one end of the transmission rod 20 and the end of the long groove 19 engage, the transmission rod 20 moves following the tilting of the cam plate 17. At the same time, the throttle lever 16 also tilts in the speed increasing direction.

FIG. 3 shows a sixth embodiment of the linkage mechanism, in which an electromagnetic clutch 22, 23 is provided on the output shaft 21 of the drive device 12, the operating lever 1 is connected to the electromagnetic clutch 22 via a transmission rod 24, and the electromagnetic clutch 22 is connected to the operating lever 1 via a transmission rod 24. 26 is connected to the throttle lever 16 via a transmission rod 25, and when the driven body rotates at low speed, only the electromagnetic clutch 22 is energized and connected to the output shaft 2.
When the driven body rotates at high speed, the electromagnetic clutch 26 is also energized and connected to perform the speed increasing operation in the same manner as in the previous embodiment.

As described above, according to the present invention, since the operating lever of the hydraulic pump and the throttle reheat of the engine are selectively linked to the drive device through the ttMm machine, the drive device at the head office increases the speed of the driven body. It is also possible to prevent an excessive increase in drive output and noise.

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram of the apparatus of the present invention, FIG. 2 shows a second embodiment of the linkage mechanism, and FIG. 3 shows a third embodiment of the linkage mechanism. P... Reversible variable displacement hydraulic pump, 1... Operation, bar, 12... [front fit, 16... Throttle lever 0

Claims (1)

[Claims] Changing the discharge amount and discharge direction of the Kanrocho Henkeisha type hydraulic pump uJ Gi + Increase the operating lever and engine tkk
A drive control device for a reversible 11rJ variable valley track type hydraulic pump in which a throttle lever for controlling speed +Ir1J is selectively linked to a drive device via a linkage mechanism.