JPH0241362Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field The present invention is suitable for use as an operation control device for two actuation mechanisms in hydraulic equipment, for example, one actuation mechanism that controls power connection/disconnection between an engine transmission and a hydraulic pump. A hydraulic system for lifting and lowering a cargo box of a dump truck, which comprises a power extraction means and a switching valve as the other operating mechanism for switching and supplying hydraulic oil from a hydraulic pump to a hydraulic cylinder for lifting and lowering a cargo box. The present invention relates to an operation control device that controls the operation of a switching valve by operating a single operating rod.

(2) Conventional technology Conventionally, in such an operation control device, for example, the first stage stroke of the switching valve and the stroke between the "on" and "off" positions of the power extraction means are set to be the same, and the power The first actuating rod connected to the take-out means and the second actuating rod connected to the switching valve are engaged when the second actuating rod is operated in the first stage, and further operations of the second actuating rod are engaged. Sometimes, the engaged state of both operating rods is released (for example,
-7814).

(3) Problems to be solved by the invention However, in the above configuration, one of the switching valves
This cannot be done if the stage stroke and the stroke of the power extraction means are different.

The present invention was developed in view of such circumstances, and is a method for controlling the operation of two actuating mechanisms in hydraulic equipment, in which the operation of a pair of actuating mechanisms with different strokes is controlled by operating a single operating rod. The purpose is to provide equipment.

B. Structure of the invention (1) Means for solving the problem The device of the present invention has a frame body having a sliding hole extending in a straight line; and having a concentric insertion hole extending over the entire length, the device can be slid into the sliding hole. a first actuating rod coupled to the first actuating mechanism that is inserted into the first actuating mechanism and has an actuating stroke of a first distance; a first actuating rod having a fitting hole at an end opposite the first actuating rod and sliding into the sliding hole; a second actuation rod coupled to a second actuation mechanism that is movably inserted and has an actuation stroke a second distance shorter than the first distance; an operation rod that is movably inserted into the insertion hole and the insertion hole; and; a state in which the first actuating rod and the operating rod are engaged at a position where a third distance, which is obtained by subtracting the second distance from the first distance, is spaced between the end of the second actuating rod, and the first distance. a first engaging means capable of switching the state in which the first operating rod is engaged with the frame according to the movement of the operating rod and the first operating rod; a third engaging means between the first operating rod and the first operating rod; A state in which the second actuating rod and the frame body are engaged at a position separated by a distance, and a state in which the first actuating rod and the second actuating rod are in contact with each other as the operating rod and the first actuating rod move by the first distance. and a second engaging means capable of switching between a state in which the second operating lever and the operating lever are engaged until the operating lever and the second operating lever move by a second distance after engaging the operating lever.

(2) Effect According to the above configuration, the first engaging means engages the first operating rod and the operating rod, the second engaging means engages the second operating rod and the frame, and the first operating rod is engaged. When the operating lever is moved the first distance toward the second operating lever from a state where the second operating lever is spaced a third distance apart, the first operating lever also moves in accordance with the movement of the operating lever, and the first engagement occurs. By the time the first operating rod and the frame are engaged by the means and the movement of the first operating rod is stopped, the first operating rod is in contact with the second operating rod, and the second operating rod is pressed and driven. The second operating rod and the operating rod are engaged by the engaging means. In other words, the first movement due to the movement of the first operating rod
The operating stroke of the actuating mechanism is obtained by moving the operating rod by a first distance from the engaged state of the first operating rod and the operating rod to the engaged state of the first operating rod and the frame by the first engagement means. On the other hand, the operating stroke of the second operating mechanism is obtained by moving the operating lever and the second operating lever the second distance after the first and second operating levers come into contact with each other. The actuation mechanism can be actuated by different strokes.

(3) Embodiment Hereinafter, an embodiment in which the present invention is applied to a hydraulic system for lifting and lowering a cargo box of a dump truck will be explained with reference to the drawings.First, in FIG. A hydraulic cylinder 2 is connected to the hydraulic pump 33, and power from an engine (not shown) is extracted and supplied to the hydraulic pump 33 by an operation extracting means 5 serving as a first operating mechanism. Oil is selectively supplied to the hydraulic cylinder 2 by a switching valve 4 as a second operating mechanism. The operation of these switching valves 4 and operation take-off means 5 are controlled by an operation control device 6 according to the present invention.

A power take-off shaft 8 is rotatably supported in the casing 7 of the power take-off means 5 , and a slider 9 is coupled to the power take-off shaft 8 via a spline 10 . A shift shaft 11 parallel to the power take-off shaft 8 is supported in the casing 7 so as to be movable in the axial direction, and a shift fork 12 fixed to the shift shaft 11 holds the slider 9. Therefore, as the shift shaft 11 moves in the axial direction, the slider 9 is caused to slide on the power take-off shaft 8 in the axial direction. Further, a gear 13 is formed on the outer circumferential surface of the slider 9 on one axial end side, and a gear 14 that can mesh with the gear 13 is arranged in the casing 7 . This gear 14 is an output gear of a transmission of an engine (not shown), and when both gears 13 and 14 mesh with each other, power is transmitted to the power output shaft 8. That is, the slider 9 is moved to a position where the gear 13 is not meshed with the gear 14 as shown in the first figure, and a position where the slider 9 is moved by a first distance l ₁ to the right side in FIG. The shift fork 12, that is, the shift shaft 11, is driven and controlled by the operation control device 6 by a stroke of a first distance _l1 .

A drive shaft 15 of the hydraulic pump 3 is connected to an end of the power take-off shaft 8 that protrudes from the casing 7 .
Therefore, in the operation extraction means 5, both gears 1
Only when 3 and 14 are in mesh, power from the engine is transmitted to the hydraulic pump 3.
is driven. This hydraulic pump 3 is, for example, a gear pump, and a switching valve 4 is interposed between its discharge oil passage 16 and return oil passage 17 and the hydraulic cylinder 2.

The switching valve 4 is a spool valve, and its valve body 18
A valve hole 19 extending parallel to the shift shaft 11 of the power extraction means 5 is bored in the valve hole 1.
The spool valve body 20 is slid onto 9. On the inner surface of the valve hole 19, first, second and third annular grooves 21, 22 and 23 are carved at equal intervals in order from the left side in FIG. 1 along the axial direction. and the widths of the second annular grooves 21 and 22 are set equal,
The third annular groove 23 is connected to the first and second annular grooves 21 and 2.
It is set wider than 2. The spool valve body 20 is provided with an annular recess 26 between the land portions 24 and 25 at both ends in the axial direction, and the length of the annular recess 26 in the axial direction is equal to
1, 22, and 23 are set to such an extent that they can be commonly communicated. Further, the spool valve body 20 is controlled by the operation control device 6 to have a first switching position in which all the annular grooves 21, 22, and 23 are communicated in common, and a second switching position in which the land portion 24 closes the first annular groove 21. The drive between the land portion 24 and the third switching position where the first and second annular grooves 21 and 22 are closed is controlled, and the second distance l ₂ corresponding to one stroke between each switching position is determined by the power extraction means. The first distance l1 of the operating stroke of No.5 is set smaller than the first distance _l1 .

The discharge oil passage 16 of the hydraulic pump 3 is connected to the second annular groove 22
The return oil passage 17 is communicated with the third annular groove 23 . Further, the first annular groove 21 communicates with an oil passage 27, and the second annular groove 22 has a check valve 28 in the middle thereof.
Both oil passages 27, 29
is communicated with the head side hydraulic chamber 2a of the hydraulic cylinder 2. The check valve 28 allows hydraulic oil to flow from the second annular groove 22 to the head side hydraulic chamber 2a only when the oil pressure in the second annular groove 22 exceeds a set value. Further, the third annular groove 23 communicates with the head side hydraulic chamber 2b of the hydraulic cylinder 2 via an oil passage 30. Furthermore, the piston rod 31 of the hydraulic cylinder 2
is connected to the cargo box 1 of the dump truck.

The actuation control device 6 includes a frame 33 having a sliding hole 32 extending in a straight line on the axial extension line of the valve hole 19 of the switching valve 4, and a frame 33 having an insertion hole 34 extending over the entire length concentrically and sliding into the sliding hole 32. A first operating rod 35 that is movably inserted, a second operating rod 37 that has a fitting hole 36 at the end opposite to the first operating rod 35 and is slidably inserted into the sliding hole 32; Hole 34 and insertion hole 3
an operating rod 38 slidably inserted into the first operating rod 35 and the operating rod 38 or the first operating rod 3;
5 and the frame 33, and a second engagement means 39 that can selectively engage the second operating rod 37 and the operating rod 38 or the second operating rod 37 and the frame 33. and an engaging means 40.

A male thread 41 is formed at the end of the first actuating rod 35 opposite to the second actuating rod 37, and a nut 42 screwed into the male thread 41 is used to tighten the pressing member 43.
is fixed to the end of the first operating rod 35. The pressing member 43 has an arm 43a extending toward the actuation/removal means 5, and the free end of this arm 43a is connected to the shift shaft 11.
connected to the end of the Also, the first operating rod 37
The spool valve body 20 of the switching valve 4 is connected to the end opposite to the operating rod 35 . Furthermore, the operating lever 3
A connecting ring 44 is screwed onto the end protruding from the first operating rod 35 of No. 8, and a wire (not shown) is connected to this connecting ring 44.

The first engagement means 39 includes an annular first engagement groove 45 formed on the outer periphery of the operating rod 38, a first engagement hole 46 formed in the middle of the first operating rod 35, and a frame. It consists of an annular first engaging recess 47 formed on the inner periphery of the sliding hole 32 in the body 33 and a first spherical body 48 . Moreover, the first sphere 48 is connected to the first engagement groove 4
5 and the first engagement hole 46 to engage the operating rod 38 and the first operating rod 35, and can simultaneously engage the first engagement hole 46 and the first engagement recess 47. The first operating rod 35 and the frame 33 can be engaged with each other, and these two engagement modes are selectively switched according to the forward and backward movement of the operating rod 38 along the axial direction.

The second engagement means 40 includes an annular second engagement groove 49 formed on the outer periphery of the operation rod 38 closer to the second operation rod 37 than the first engagement groove 45; A second hole is drilled in the part facing the insertion hole 36.
an engagement hole 50, an annular second engagement recess 51 formed on the inner periphery of the sliding hole 32 in the frame body 33 closer to the second operating rod 37 than the first engagement recess 47, and a second spherical body. It consists of 52. Moreover, the second sphere 52 is
It is possible to simultaneously engage the second engagement groove 49 and the second engagement hole 50 to engage the operating rod 38 and the second operating lever 37, and also to engage the second engagement hole 50 and the second engagement recess. 51 and can engage the second operating rod 37 and the frame 33 at the same time, and these two engagement modes can be selectively switched according to the forward and backward movement of the operating rod 38 along the axial direction. .

In such an operation control device 6, the switching valve 4
As shown in FIG.
The first engaging means 39 engages the first operating rod 35 and the operating rod 38, and the second engaging means 40 engages the second operating rod 3.
7 and the frame 33 are set to engage with each other.
Moreover, in this state, between the opposing ends of the first operating rod 35 and the second operating rod 37, one of the operating levers 5 is
The third distance l _{3 ( l 1 −}
l ₂ ), the distance between the first engagement hole 46 and the first engagement recess 47 is set to the first distance l 1 , and the distance between the second engagement groove 49 and the second engagement recess 47 is set to the first distance l ₁ .
The distance between the engagement holes 50 is set to a third distance _l3 .

Next, the operation of this embodiment will be explained with reference to FIG. 2.First, the switching valve 4 is set to the first switching position, and the gears 13, 14 are
When the operation lever 38 is not engaged, the operating rod 38 is in the state shown in Fig. 2a, that is, in the state shown in Fig. 1.
Adjust the position.

Next, when power is transmitted by the power extraction means 5 and the switching valve 4 is set to the second switching position, the operating rod 38 is moved from the state shown in FIG. 2a to the position shown in FIG. 2b by the first distance l. ₁ , that is, the operation is performed by one stroke of the actuating and extracting means 5. On this occasion,
The operating rod 38 and the first operating rod 35 are the first engaging means 3
9, the first operating lever 35 also moves to the right in response to the rightward movement of the operating lever 38. Moreover, the operating lever 3
5 moves to the right by a third distance _l3 , the first operating rod 35 comes into contact with the second operating rod 37, and the second operating rod 35
The engagement groove 49 reaches the position of the second engagement hole 50. Therefore, the second operating rod 37 is pressed by the first operating rod 35 and starts to move to the right, and the second sphere 52 moves to the second
It rises from the engagement recess 51 and engages the second engagement hole 50 and the second engagement groove 49 . That is, the second
The operating rod 37 and the operating rod 38 are engaged.
Further, after the first operating rod 35 and the second operating rod 37 come into contact, the operating rod 38, the first and second operating rods 35,
37 to the right by a distance l ₂ , the spool valve body 20 of the switching valve 4 switches from the first switching position to the second switching position, and the first engagement means 39 engages the first engagement hole 46 and the first engagement position. Engagement with the mating recess 47, that is, engagement between the first operating rod 35 and the frame 33 is performed.
Up to this point, the first operating rod 35 has moved to the right by the first distance _l1 , the shift fork 11 has moved by the first distance l1 via the pressing member 43, and the gear 1 has moved to the right by the first distance _l1 .
3 and 14 mesh. As a result, power from the engine is transmitted to the hydraulic pump 3, and the hydraulic pump 3
is driven.

On the other hand, in the switching valve 4, the first annular groove 21 is closed and the second and third annular grooves 22 and 23 are communicated with each other, so the head side hydraulic chamber 2a of the hydraulic cylinder 2 is closed and the load is The previous position of box 1 is maintained.

When the operating rod 38 is further moved to the right by a second distance l ₂ from the state shown in FIG. 2b, as shown in FIG. The operating rod 37 is moved to the right by a second distance l ₂ and the switching valve 4 is switched to the third switching position. Also at this time,
Since the first engaging means 39 engages the first operating rod 35 and the frame 33, the first operating rod 35 cannot move to the right.
14 remains engaged, and the hydraulic pump 3 continues to be driven.

In the switching valve 4 in the third switching position, the second annular groove 22 is separated from the third annular groove 23, so that
Hydraulic oil from the hydraulic pump 3 is supplied to the head side hydraulic chamber 2a of the hydraulic cylinder 2, and the hydraulic cylinder 2 is driven to extend. This causes the cargo box 1 to be raised.

When the operating rod 38 is moved to the left from the state shown in Fig. 2c,
Contrary to the above, from Figure 2c to Figure 2b,
The switching position of the switching valve 4 is switched to the state shown in FIG.
On the way to figure a, the meshing state of both gears 13 and 14 is released, and power transmission to the hydraulic pump 3 is cut off.

In addition, the frame body 33, the casing 7, and the valve body 1
8 may be integrated.

C. Effects of the invention As described above, according to the device of the present invention, the first and second actuating rods can be moved by different distances by one axial movement operation of the operating rod. Different stroke distances 2
The operation of two actuating mechanisms can be controlled simultaneously by only one operation of the operating lever.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view of a main part, and FIGS. 2 a, b, and c are longitudinal sectional views sequentially showing operating states of the actuation control device. 4... Switching valve as a second operating mechanism, 5... Power extraction means as a first power mechanism, 32... Sliding hole, 33... Frame, 34... Insertion hole, 35... First operation Rod, 36... Fitting hole, 37... Second operating rod, 38... Operating rod, 39... First engaging means, 4
0...second engagement means, _l1 ...first distance, _l2 ...second distance, _l3 ...third distance.

Claims (1)

[Scope of utility model registration request] Frame body 33 having a sliding hole 32 extending in a straight line
and; a first operating rod that is slidably inserted into the sliding hole 32 while concentrically having an insertion hole 34 extending over its entire length, and that is connected to the first operating mechanism 5 having an operating stroke of a first distance _l1 . 35 and; first operating rod 3
a second distance that is slidably inserted into the sliding hole 32 while having a fitting hole 36 at the end opposite to the second distance l1, and has an operating stroke shorter than the first distance _l1 ;
a second operating rod 37 connected to the second operating mechanism 4 which is l ₂ ; an operating rod 38 movably inserted into the insertion hole 34 and the insertion hole 36; a second distance l from the first distance l ₁ ; The third distance l ₃ obtained by subtracting ₂ from the second operating rod 3
The first operating rod 3 located at a space between the end of the
5 and the state in which the operating rod 38 is engaged, and the first distance
_{a first} engaging means 39 capable of switching the state in which the first operating rod 35 is engaged with the frame 33 in accordance with the movement of the operating rod 38 and the first operating rod 35 by 1;
A state in which the second operating rod 37 and the frame 33 are engaged with each other at a third distance l ₃ from the first operating rod 35; After the first operating rod 35 and the second operating rod 37 come into contact with each other as they move one distance l ₁ , the second operating rod 37 and the operating rod 38 and the second operating rod 37 move by a second distance l ₂ . An operation control device for a dual-actuation mechanism in a hydraulic equipment, comprising: a second engagement means 40 capable of switching between a state in which a rod 38 is engaged and a second engagement means 40;