JPS5916967B2 - Drive control device for hydraulically operated equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive control device for controlling the drive of hydraulically operated equipment such as hydraulic cylinders in specially equipped vehicles such as dump trucks.

Generally, a drive control device for hydraulically operated equipment in a specially equipped vehicle extracts power from the engine's transmission using a power extraction device, uses that power to drive a gear pump, and supplies pressure oil from the gear pump to the hydraulic cylinder via a switching valve. , the hydraulic cylinder is made to expand and contract, but in the past, the power take-off device, the shift rod for operating the power take-off device, the gear pump, and the switching valve were provided in separate housings. The connection/disconnection control mechanism and the switching control mechanism of the switching valve are configured separately and guided to the driver's cab by a wire, and the shift rod and the spool of the switching valve are separately restricted.

This has the disadvantage that the device is large and complicated.

The present invention has been made in view of the above points, and includes a power take-off device that is connected to an engine transmission and extracts power from the transmission, a shift rod that connects and disconnects the power of the power take-off device, and a gear pump. and a switching valve for switching the flow of pressure oil discharged by the gear pump are incorporated into a second housing, and the first housing and the second housing are connected, and the main shaft of the power extraction device = the drive of the gear pump. The shift rod is connected to the shaft at its end, and the shift rod and the spool of the switching valve are arranged substantially concentrically, and their connecting ends are connected via a flexible joint. This is a drive control device for hydraulically operated equipment, which is characterized by absorbing eccentricity and non-parallelism between the spool of the switching valve and the spool of the switching valve.

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

As shown in FIGS. 1 and 2, reference numeral 1 denotes a drive control device installed in a dump truck, which controls the drive of a dump cylinder 2 (hydraulic operating device) using engine power.

The drive control device 1 includes a power extraction device 3 and a gear pump 4 (!
A switching valve 5 for switching the flow of l-pressure oil is integrally formed.

The power extraction device 3 is connected to a transmission 6 of the engine and connects/disconnects power from the transmission 6. A main shaft 8 is disposed within a first housing T fixed to the transmission 6, and bearings 9, It is rotatably held via 9.

The main shaft 8 has a recess 10 formed at one end, and an output gear 12 is rotatably fitted in the center of the first housing 7 via a bearing 11, and a spline is provided at a position adjacent to the bearing 11. 13 are formed.

The output gear 12 meshes with an input gear 14, which meshes with a power take-off gear (not shown) of the transmission 6 and constantly rotates when the engine is driven.

Internal teeth 15 are formed at one end of the output gear 12 .

Further, a clutch gear 16 is fitted to the spline 13 so as to be slidable in the axial direction, and the clutch gear 16 meshes with the internal teeth 15 of the output gear 12 to direct the rotation of the output gear 12 to the main shaft 8. A U-shaped groove 17 is separately provided on the negative side.

A shift rod 18 is provided in the upper part of the first housing T in parallel with the main shaft 8. It is held slidably in the axial direction by a boss portion 21.

The large diameter portion 19 is provided with arc-shaped first, second, and third circumferential grooves 22, 23, and 24 at equal intervals.
A circumferential arcuate groove 25 is separately provided in the shift fork 26, and a shift fork 26 is slidably fitted in the boss portion 27 of the shift fork 26.
Furthermore, an operating lever 28 inside the cab is provided at one end of the small diameter portion 20.
? They are connected via a wire 29.

The shift fork 26 has a clutch pawl 30 on the boss portion 27.
are connected, and the clutch pawl 30 is connected to the clutch gear 16.
It is engaged with the U-shaped groove 17 of.

A through hole 31 penetrating from the outer surface to the inner surface is formed in the upper part of the boss portion 27, and a ball 32 is inserted into the through hole 31, and the ball 32 has a diameter larger than the wall thickness of the boss portion 27. There is.

A sliding surface 33 with which the upper surface of the boss portion 27 slides is formed on the inner upper surface of the first housing 7, and an arc-shaped notch 34 is formed in the sliding surface 33.
The shift fork 26 is held by the ball 32 being engaged with the shift fork 4.

Further? The boss portion 21 of the first housing 7 is provided with a notch ball 35 and a spring 36, and the notch ball 35 is connected to the first, second and third circumferential grooves 22°23.2.
4 to hold the shift rod 18 in the 3rd position.

The gear pump 4 is driven by the power of the power extraction device 3, and the second housing 37 of the gear pump 4 is fixedly attached to the first housing 7 of the power extraction device 3 by a connecting means (not shown).

A drive gear 3 is disposed in close contact with the second housing 37.
8 and a driven gear (not shown) 7 are provided,
The switching valve 5 is built in the upper part.

The drive gear 38 is formed integrally with a drive shaft 39, and the drive shaft 39 is rotatably held by the second housing 37 at both ends thereof, and has a convex portion 4 at one end.
0 is formed.

The convex portion 40 is the concave portion 10 of the main shaft 8? The main shaft 81 is directly connected to the main shaft 81.

The main shaft 8 and the drive shaft 39 are directly connected concentrically.

The switching valve 5 switches and controls the pressure oil from the gear pump 4. A spool hole 41 is formed in the second housing 37 parallel to the drive shaft 39, and a spool 42 is slidably inserted into the spool hole 41. It is inserted.

One end of the spool 42 is directly connected to the large diameter portion 19 of the shift rod 18 via a flexible joint 43, and is located approximately concentrically with the shift rod 18.

The switching valve 5 includes an A chamber 44 having a larger diameter than the spool hole 41;
The B chamber 45 and the C chamber 46 are connected to the first to third circumferential grooves 22,
23 and 24 at appropriate intervals.

The flexible joint 43 has a protrusion 47 formed at the end of the large diameter portion 19 of the shift rod 18 and an insertion hole 48 formed at the end of the spool 42, and the insertion hole 48 has a larger diameter than the protrusion 47. , the protrusion 47 is inserted into the insertion hole 48? They are fitted with a play gap 60 and connected by a spring pin 49 having a gap 49a.

The flexible joint 43 connects the shift rod 18 and the spool 42.
The spool 42 is moved in accordance with the movement of the shift rod 18 by absorbing positional errors in the vertical and horizontal directions and inclinations of both axes.

Further, the second housing 37 includes an inlet passage 51 of the gear pump 4 whose one end is connected to the oil tank 50, a discharge passage 52 of the gear pump 4 whose one end is connected to the B chamber 45 of the switching valve 5, and one end of which is connected to the B chamber 45 of the switching valve 5. The C chamber 46 of the switching valve 5 is formed with an oil passage 53 whose other end is connected to the suction passage 51.

Further, a check valve 54 is provided in the second housing 37, and an oil passage 55 is connected at one end to the suction port of the check valve 54 and at the other end to the B chamber 45 of the switching valve 5. , an oil passage 56 with one end connected to the discharge port of the check valve 54 and the other end connected to the rear port of the dump cylinder 2; one end connected to the oil passage 56, and the other end connected to the A chamber 44 of the switching valve 5. An oil passage 51 connected to each is formed.

Next, to explain the operation, in the initial state in which the dump cylinder 2 (hydraulic operating device) is not operated, as shown in FIG.
The notch ball 35 rotates around the spool 42 in the third circumferential groove 24.
The shift fork 26 is positioned to the left and the clutch gear 16 is disengaged from the output gear 12, and the output gear 12 is idle and the main shaft 8 and gear pump 4 is stopped.

The shift fork 26 is held by the shift rod 18 with the ball 32 engaged with the arcuate groove 25, and the spool 4
The tip of the cylinder 2 is located inside the A chamber 44, and the return oil from the rear port of the dump cylinder 2 flows through the oil path 56°57, the A chamber 44, and the B
It passes through the chamber 45, the C chamber 46, and the oil passage 53 in order and returns to the oil tank 50.

From the above state, as shown in FIG.
When the shift rod 18 is moved to the right, the spool 42 and the shift fork 26 are moved to the right as the shift rod 18 is moved.
6 moves, the clutch gear 16 meshes with the internal teeth 15 of the output gear 12 and begins to rotate, the main shaft 8 rotates, and the gear pump 4 is driven.

When the shift rod 18 moves and the notch ball 35 engages with the second circumferential groove 23 and is held at an intermediate position, the boss portion 27 of the shift fork 26 moves into the first housing 7.
The clutch gear 16 contacts the boss portion 21 of the output gear 1.
2 completely meshes.

At this time, the arcuate groove 25 and the notch 34 match through the through hole 31, and the ball 32 is located therein.

Further, the tip of the spool 42 is located between the A chamber 44 and the B chamber 45, and the communication between the A chamber 44 and the B chamber 45 is cut off, and the dump cylinder 2 is held with the rear port closed. The pressure oil from the gear pump 4 is transferred to chamber B 45, chamber C 46,
It is returned to the ring via the oil path 53.

Subsequently, as shown in FIG. 4, the operating lever 28 is used to
When the shift rod 18 is further moved to the right position, as the shift rod 18 moves lζ, the ball 32 engaged with the arcuate groove 25 is pushed upward and the notch 3
4, the shift fork 26 is held in the housing 7 without moving, and the clutch gear 16 is engaged with the output gear 1.
2 is maintained in a meshed state.

Further, as the shift rod 18 moves, the spool 42 moves to the right, and the notch ball 35 moves into the first circumferential groove 2.
2, the tip of the spool 42 enters the B chamber 45 (!:
Located between the C room 46, the A room 44, the B room 45, and the B room 4
5 and the C chamber 46 is cut off, and the pressure oil from the gear pump 4 is supplied to the rear port of the dump cylinder 2 through the B chamber 45, the oil passage 55, the check valve 54, and the oil passage 56, and the pressure oil is supplied to the rear port of the dump cylinder 2. 2 expands.

Further, when the shift rod 18 is moved to the left by the operation lever 28, the operation opposite to the above is performed in sequence, and at this time, the end of the large diameter portion 19 of the shift fork 26 is disposed of by the boss portion 27, and The ball 32 is inserted into the arcuate groove 25 from the notch 34.
, and the shift fork 26 moves.

Although this embodiment has been described with reference to the case in which the present invention is applied to a dump truck, it goes without saying that the present invention can be applied to various types of vehicles that carry hydraulically operated equipment, such as mixer trucks.

Further, the flexible joint 43 may be a link or a ball joint, and the shift rod 18 and the spool 4 may be
Any material that can absorb eccentricity and non-parallelism with respect to 2 may be used.

As described above, according to the present invention, since the power take-off device and the gear pump switching valve are integrated, the entire device can be downsized, so it can be easily installed in a small space, and The main shaft of the power take-off device and the gear pump.

The shift rod of the power take-off device and the spool of the switching valve are connected substantially concentrically through a flexible joint, and the shift rod and spool are connected by the joint means. Because it absorbs positional errors, etc., it is possible to ensure high accuracy in areas that require high precision, such as alignment between the main shaft and drive shaft, and furthermore, machining is easy. Become.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention; FIG. 1 is an overall schematic diagram, FIG. 2 is a central vertical sectional view of the drive control device when the dump cylinder is retracted, and FIG. 3 is a diagram showing the dump cylinder when it is held. FIG. 4 is a longitudinal sectional view of the same, FIG. 4 is a longitudinal sectional view of the same showing the dump cylinder when it is extended, FIG. 5 is an enlarged view of the main part, and FIG. 6 is a perspective view of the spring pin. 1... Drive control device, 2... Dump cylinder, 3... Power take-off device, 4...
Gear pump, 5...Switching valve, 6...Transmission, 7...First housing, 8
...Main shaft, 12...Output gear, 16...Clutch gear, 18...
Shift rod, 26...Shift fork, 37
...Second housing, 38...Drive gear, 39...Drive shaft, 42...
... Spool, 43 ... Flexible joint.

Claims (1)

[Claims] 1. A power extraction device connected to the transmission of the engine and extracting power from the transmission and a shift rod connecting and disconnecting the power of the power extraction device are incorporated into the first housing, and a gear pump and the flow of pressure oil discharged by the gear pump are integrated into the first housing. the switching valve and the second
It is assembled into a housing, connects the first housing and the second housing, connects the main shaft of the power take-off device and the drive shaft of the gear pump at its end, and further connects the shift rod and the spool of the switching valve. The shift rod and the spool of the switching valve are arranged substantially concentrically, and their connecting ends are connected via a flexible joint, so that the shift rod and the spool of the switching valve are not biased. (f) A drive control device for hydraulically operated equipment characterized by stiffness that absorbs non-parallelism.