JPH0114052B2 - - 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, as a drive control device for hydraulically operated equipment in a specially equipped vehicle, a power extraction device, a shift rod for operating the power extraction device, a gear pump, and a switching valve are provided in separate housings, and the two housings are connected at their ends. The main shaft of the power take-off device and the drive shaft of the gear pump are arranged concentrically and their ends are connected by a coupling means, and the shift rod and the spool of the switching valve are arranged concentrically and their ends are connected to the coupling means. In such a drive control device, both the joint means are installed in a sealed manner inside the housing and are not visible from the outside.
It is not possible to observe the operation (rotation) status of the main shaft of the power take-off device and the drive shaft of the gear pump from the outside, or it is not possible to immediately check for oil leaks from the shaft seal due to deterioration of the hydraulic oil, etc. The drawback is that failure of the drive control device cannot be prevented.

In order to solve the above-mentioned conventional drawbacks, this invention opens both the joint means to the outside, so that it is possible to easily check the operating status of the main shaft of the power take-off device and the drive shaft of the gear pump, as well as leakage of hydraulic oil. This is how it was done.

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 is formed by integrally forming a power extraction device 3, a gear pump 4, and a switching valve 5. The power extraction device 3 is connected to a transmission 6 of the engine and connects and disconnects the power from the transmission 6. A main shaft 7 is mounted in a housing A fixed to the transmission 6 and has bearings 8 and 9 at both ends thereof. It is rotatably held through the The main shaft 7 has a recess 10 formed at one end, and an output gear 12 is rotatably fitted in the center of the housing A via a bearing 11, and a spline 13 is formed. The output gear 12 is the input gear 14
The input gear 14 meshes with the transmission 6.
It meshes with a power take-off gear (not shown) and is constantly rotating when the engine is running. Above output gear 1
Internal teeth 15 are formed on one side of 2. Further, a clutch gear 16 is fitted into the spline 13 so as to be slidable in the axial direction.
Numeral 6 meshes with the internal teeth 15 of the output gear 12 to transmit the rotation of the output gear 12 to the main shaft 7, and has a U-shaped groove 17 formed on one side thereof.

Inside the housing A is a shift rod 1 at the top.
8 is provided parallel to the main shaft 7, and the shift rod 18 consists of a large diameter part 19 and a small diameter part 20, and a boss part 2 formed in the housing A.
1 so as to be slidable in the axial direction. The large diameter portion 19 has first, second, and third arcuate circumferential grooves 22, 23, and 24 formed at equal intervals, and the small diameter portion 20 has a circumferential arcuate groove 25 formed therein. At the same time, a shift fork 26 is slidably fitted at its boss portion 27, and is connected to one end of the small diameter portion 20 via a wire 29 to an operating lever 28 in the cab. A clutch pawl 30 is connected to a boss portion 27 of the shift fork 26, and the clutch pawl 30 engages with the U-shaped groove 17 of the clutch gear 16. 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 diameter of the ball 32 is formed to be larger than the wall thickness of the boss portion 27. There is.

The boss portion 2 is provided on the inner upper surface of the housing A.
A sliding surface 33 is formed on which the upper surface of the shift fork 26 slides, and an arc-shaped notch 34 is formed in the sliding surface 33. is held fixed. Furthermore,
The boss portion 21 of the housing A 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, 2.
3 and 24 to hold the shift rod 18 in the 3rd position.

37 is a seal between the housing A and the shift rod 18, and 58 is a seal between the housing A and the main shaft 7.

The gear pump 4 is driven by the power of the power extraction device 3, and the housing B of the gear pump 4 is fixedly attached to the housing A of the power extraction device 3 by suitable connecting means.

A drive gear 38 and a driven gear (not shown) are provided in close contact with each other in the housing B, and the switching valve 5 is built in the upper part.

The drive gear 38 is a drive shaft 39
The drive shaft 39 is rotatably held by the housing B at both ends thereof, and a convex portion 40 is formed at one end. The convex portion 4
0 is inserted into the recess 10 of the main shaft 7 to constitute a joint means, and the main shaft 7
and the drive shaft 39 are directly connected.
The main shaft 7 and the drive shaft 39 are directly connected and held concentrically. The switching valve 5 switches and controls the pressure oil from the gear pump 4. A spool hole 41 is formed in the housing B parallel to the drive shaft 39, and a spool 42 is slidably inserted into the spool hole 41. has been done. One end of the spool 42 is directly connected to the large diameter portion 19 of the shift rod 18 via a joint means 43 in a loosely fitted state, and is located approximately concentrically with the shift rod 18, and the joint means 43 is open to the outside. .

The switching valve 5 has a diameter A larger than the spool hole 41.
A chamber 44, a B chamber 45, and a C chamber 46 are formed at appropriate intervals determined by the first to third circumferential grooves 22, 23, and 24.

The housing B also includes a suction passage 48 for the gear pump 4, one end of which is connected to the oil tank 47;
A discharge passage 49 of the gear pump 4 is formed with one end connected to the B chamber 45 of the switching valve 5, and an oil passage 50 with one end connected to the C chamber 46 of the switching valve 5 and the other end connected to the suction passage 48. ing. Further, a check valve 51 is provided in the housing B, and an oil passage 52 has one end connected to the inlet of the check valve 51 and the other end connected to the B chamber 45 of the switching valve 5. An oil passage 53 whose other end is connected to the discharge port of the check valve 51 is connected to the rear port of the dump cylinder cylinder 2; one end is connected to the oil passage 53, and the other end is connected to A of the switching valve 5.
Oil passages 54 connected to the chambers 44 are respectively formed. Note that the coupling means portion between the main shaft 7 and the drive shaft 39 is opened to the outside through an opening 55. Numerals 56 and 57 are sealing members between the housing B and the shift rod 18 or drive shaft 39.

Next, to explain the operation, when the shift rod 18 is moved to the right by the operation lever 28 as shown in FIG. Accordingly, the spool 42 and the shift fork 26 move to the right, and due to the movement of the shift fork 26, the clutch gear 16 meshes with the internal teeth 15 of the output gear 12 and begins to rotate.The main shaft 7 rotates and the gear pump 4 is driven.

As the shift rod 18 moves and the notch ball 35 engages with the second circumferential groove 23 and is held at the intermediate position, the boss portion 2 of the shift fork 26
7 comes into contact with the boss portion 21 of the housing A, and the clutch gear 16 completely meshes with the output gear 12.

At that time, the arcuate groove 25 and the notch 34 are connected to the through hole 3.
1, in which the ball 32 is located. 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 circulated through the B chamber 45, the C chamber 46, and the oil passage 50.

At this time, the joint means 43 between the shift rod 18 and the spool 42 and the joint means between the main shaft 7 and the drive shaft 39 are both open to the outside, and the housing A and the shift rod 18
You can immediately check for oil leaks between the housing B and the spool 42, between the housing A and the main shaft 7, and between the housing B and the drive shaft 39, as well as between the main shaft 7 and the drive shaft 39.
The rotation state of the can be observed. Also main shaft 7
can be rotated manually through the opening 55, and by manually rotating the main shaft 7, the engagement state between the input gear 14 and the power take-off gear of the transmission 6 when the power take-off device 3 is attached to the transmission 6 can be adjusted. Can be easily confirmed.

As explained above, according to the present invention, the housing A
Oil leaks and operating (rotational) conditions between the housing B and the shift rod 18, between the housing B and the spool 42, between the housing A and the main shaft 7, and between the housing B and the drive shaft 39 can be checked immediately, and failures can be prevented. In addition, it is possible to easily check the installation status of the power take-off device and the transmission, and the shaft end of the main shaft 7 or drive shaft is not exposed outside the housing, so it is safe. Furthermore, even if there is a misalignment of the axes when connecting the housings A, B and each shaft, since the joint means 43 is open to the outside of the housing, only the position of the joint means 43 will be misaligned, such as a step. Smooth connection is possible without interfering with the vicinity of the entrance.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, with FIG. 1 being an overall schematic view, and FIG. 2 being a central vertical sectional view of the drive control device when the dump cylinder is held. 1... Drive control device, 2... Dump cylinder,
3...Power take-off device, 4...Gear pump, 5...
Switching valve, 6...Mission, 7...Main shaft, 12...Output gear, 14...Input gear, 18
...Shift rod, 37, 56, 57, 58...
Seal, 39...drive shaft, 42...spool, 43...coupling means, 55...opening,
A, B...Housing.

Claims (1)

[Claims] 1. A power take-off device connected to an engine transmission and extracting power from the transmission, and a shift rod that connects and disconnects the power of the power take-off device are incorporated into the housing A, and a gear pump and a switching valve that switches and controls pressure oil from the gear pump. is incorporated into housing B, and the housing A and housing B are appropriately connected by a connecting means, and the main shaft of the power take-off device and the drive shaft of the gear pump are arranged concentrically and their ends are jointed. Further, the shift rod and the spool of the switching valve are slidably disposed substantially concentrically, and the connecting ends thereof are connected via the joint means, and both the joint means portions are connected to each other through the joint means. A drive control device for a hydraulic actuator, characterized in that the housing is open to the outside.