JPH0325672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an orifice device;
In particular, the present invention relates to a variable orifice device that includes a plurality of types of orifices with different cross-sectional areas and can change the throttling action by selecting the orifices.

2. Description of the Related Art A variable orifice device is installed in a vehicle such as a forklift that uses a combination of a torque converter and a transmission. A variable orifice device is installed in the liquid path where the torque converter and transmission are connected.
The flow rate of the liquid supplied to them is controlled, and conventionally known devices are shown in FIGS. 8 and 9. In the figure, 200 is a valve body, and inside this valve body 200 there is a valve hole 2 with a bottom that opens on the side surface of the valve body 200.
02, and a first liquid passage 204 and a second liquid passage 206 that intersect with two longitudinally separated locations of the valve hole 202, respectively. The valve hole 202 has a circular cross-sectional shape, and an orifice valve 208 is fitted therein in a substantially liquid-tight and rotatable manner. A bottomed hole 210 that opens on one side in the longitudinal direction and extends in the axial direction is formed in the orifice valve 208, and the orifice valve 208 is inserted into the valve hole 202 with the opening side of the bottomed hole 210 first. It is fitted. When the orifice valve 208 is inserted to the vicinity of the bottom of the valve hole 202, the first liquid passage 20
4, four communication holes 212 having a relatively large diameter are formed at equal angular intervals. Also, the second liquid passage 206 of the orifice valve 208
An orifice group 214 is formed in a portion that matches the . As shown in FIG. 9, the orifice group 214 includes orifices 216 of the same diameter formed at two locations separated in the diametrical direction, and has a larger cross-sectional area than the orifices 216. It is equipped with orifices 218 formed at two locations with a phase difference of 90 degrees, and the throttling action can be changed into two types by rotating the orifice valve 208.

In addition, the bottomed hole 210 of the orifice valve 208
The end on the bottom side is a male threaded part 220,
A tool engagement groove 222 with a rectangular cross section is formed in the end face. And orifice valve 208
An O-ring 228 is fitted into a chamfered portion 226 formed at the opening end of the valve hole 202 in a state in which the male threaded portion 220 is screwed into the female threaded portion 224 formed at the opening of the valve hole 202; The lock nut 230 is screwed onto the end protruding from the valve hole 202 in a state in which rotation is prevented by the tool engaged in the tool engagement groove 222, thereby liquid-tightly fixing the lock nut 230 to the valve body 200. .

In such a variable orifice device, if the orifice valve 208 is in the state shown in FIG. The liquid flows into the second liquid passage 206 while being subjected to the throttling action of. When changing the throttling action, move the orifice valve 208 in the appropriate direction.
Rotate 90 degrees. That is, Locknut 230
After loosening the screws, the orifice valve 208 may be rotated so that the desired orifice is in communication with the second liquid passage 206.

Problems to be Solved by the Invention However, in the variable orifice device configured as described above, the orifice valve 20
There is a limit to the number of orifices that can be provided in the circumferential direction of the 8, and there is a problem in that it is not possible to increase the number of types of orifices.

Means for Solving the Problems In order to solve the above problems, the present invention provides (a) a valve body having a valve hole, a first liquid passage, and a second liquid passage, and (b) a communication hole and an orifice. (c) a variable orifice device including an orifice valve having a group of orifices (this orifice group is referred to as a first orifice group); and (c) a fixing means; A second orifice group consisting of a plurality of types of orifices having different cross-sectional areas from the first orifice group is formed at a distance equal to the distance between the communication holes and the first orifice group, and the fixing means is connected to the orifice valve. In the longitudinal direction centered on the part where the hole was formed
It can be fixed in a 180 degree inverted position.

In a preferred embodiment of the present invention, the fixing means is formed from a plurality of recesses formed circumferentially apart on the outer peripheral surface at two locations symmetrical in the longitudinal direction with respect to the portion where the communication hole of the orifice valve is formed. and at least one engagement member provided in the valve body and removably engaged with one of the plurality of recesses to prevent rotation of the orifice valve. be done.

Moreover, in another desirable aspect of the present invention,
The valve hole is a dead-end hole, and the fixing means is screwed into a female thread formed at the open end of the dead-end hole to sandwich the orifice valve between it and the bottom of the dead-end hole to control its longitudinal position. It shall include a fixing plug.

In yet another preferred embodiment of the present invention, the orifice valve includes a communicating hole formed in the longitudinal center of a cylindrical member with both ends open, and two groups of orifices located at symmetrical positions in the longitudinal direction with respect to the communicating hole. and two groups of recesses are respectively formed.

Function In the orifice valve configured as described above, the orifice valve is removed from the valve hole after being released from the fixation by the fixing means, and after being inverted around the part where the communication hole is formed,
If the communication hole is inserted into the valve hole so that it is aligned with the first liquid passage, the orifice group on the opposite side of the orifice group that was previously aligned with the second liquid passage will be aligned with the second liquid passage. becomes. If the orifice valve is rotated in this state, the desired orifice will be in communication with the second liquid passage and the desired throttling action will be obtained, and by fixing the orifice valve to the valve body using the fixing means, the The state can be maintained.

When the fixing means includes a group of recesses and an engaging member, after the engaging member is removed from the recess,
The orifice valve is pulled out from the valve hole of the orifice valve and rotated, and if the fixing means includes a plug, the orifice valve is operated after removing the plug.

Effects of the Invention As described above, in the variable orifice device according to the present invention, two orifice groups are provided,
By reversing the orifice valve 180 degrees,
A desired orifice group can be made to match the second liquid passage,
It is possible to install twice as many orifices as in the past.

If the fixing means is configured to prevent rotation of the orifice valve by engagement between the recess and the engagement member,
Since the orifice valve is positioned in the circumferential direction, no misalignment occurs between the communication hole and the first liquid passage, and between the orifice and the second liquid passage, and the communication is ensured.

Furthermore, if the valve hole is a dead-end hole and the orifice valve is fixed in its longitudinal position by being sandwiched between the bottom of the dead-end hole and a plug screwed into the opening of the dead-end hole, the orifice valve can be fixed in the valve hole. It would be better if it could be rotated independently inside. In other words, when the orifice valve itself is provided with a male thread and its longitudinal position is fixed by screwing with the valve body as in the past, the communication hole and the orifice and the first and second There is a risk of misalignment in the axial direction with the second liquid passage, and when forming the orifice valve and valve hole, it is necessary to accurately center the threaded part and other parts. However, if the orifice valve and the plug are made separate, such inconveniences can be eliminated.

Furthermore, when the orifice valve is made of a cylindrical member, the effect of facilitating the manufacture of the orifice valve can be obtained.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 5 is a diagram showing a hydraulic circuit of a torque converter type forklift equipped with a variable orifice device according to an embodiment of the present invention. In the figure 1
0 is a torque converter, and this torque converter 10 is connected via a throttle 18 to an oil passage 16 that supplies oil pumped up by a pump 13 from an oil pan 12 to a clutch 14.
Another oil passage 21 equipped with a regulator 20 and an accumulator 22 are connected to a portion of the oil passage 16 closer to the clutch 14 than the torque converter 10, and an inching valve is connected between the accumulator 22 and the clutch 14. 24,
A select valve 26 is provided. and,
The oil pumped up from the oil pan 12 by the pump 13 is transferred to the torque converter 10, regulator 20 and accumulator 22 (clutch 14).
The oil is supplied to the part of the oil passage 16 to which the accumulator 22 is connected and the regulator 20.
variable orifice device 3 between the connected part
0 is provided, so that the ratio of the amount of oil supplied to the torque converter 10 and the regulator 20 and the amount of oil supplied to the accumulator 22 can be changed in accordance with the specifications of the forklift.

A variable orifice device 30 is shown in FIG. In the figure, 32 is a valve body, and a dead-end hole 34 with a circular cross section is provided in the valve body 32 as a valve hole. The bottom side of the dead-end hole 34 is a fitting part 36 whose inner peripheral surface is cylindrical, while a large-diameter female screw part 38 is formed at the opening side end. An oil passage 40 as a first liquid passage and an oil passage 42 as a second liquid passage are formed, each intersecting two locations spaced apart in the longitudinal direction. The oil passage 40 is slightly closer to the female threaded portion 38 than the longitudinal center of the fitting portion 36.
The oil passage 42 is formed closer to the bottom of the dead-end hole 34 than the oil passage 40, and both oil passages 40, 42 cross the dead-end hole 34 to the opposite side. It is formed to extend out.

The dead end hole 34 has an orifice valve 4.
4 are rotatably fitted. The orifice valve 44 is a cylindrical member with both ends open, and has a length that slightly protrudes into the female threaded portion 38 when it is fitted into the fitting portion 36 of the dead-end hole 34 . The longitudinal position is fixed by being sandwiched between the bottom surface and a plug 48 screwed into the female threaded portion 38 with a gasket 46 in between. Four communication holes 50 are formed in the longitudinal center of the orifice valve 44 at equal angles in the circumferential direction. The diameter of these communication holes 50 is made slightly smaller than the diameter of the oil passage 40, and the fitting portion 3
The oil passage 40 and the space inside the orifice valve 44 are made to communicate with each other in a state in which the communication hole 50 of either of the holes 6 and 6 is in communication with the oil passage 40.

The orifice valve 44 also includes an oil passage 42.
A first orifice group 52 is formed in a portion that matches the above, and a first orifice group 52 is formed at a position opposite to the first orifice group 52 with respect to the communication hole 50, and at a distance between the communication hole 50 and the first orifice group 52. A second orifice group 54 is formed at equal distances. That is, both orifice groups 52 and 54 are formed at symmetrical positions with respect to the communication hole 50 in the longitudinal direction. First orifice group 52
As shown in FIG. 2, two orifices 56 of the same diameter are formed at two locations separated in the diametrical direction, and two orifices 56 having a larger cross-sectional area than the orifices 56 and located at positions 90 degrees out of phase with each other are arranged. and an orifice 58 formed therein. Further, as shown in FIG. 3, the second orifice group 54 includes two types of orifices 60 and 62 having different cross-sectional areas from those of the orifices 56 and 58. Like the orifices 56, 58, these orifices 60, 62 are also formed at two locations separated in the diametrical direction with a phase difference of 90 degrees. In the state where the oil passage 4 is in communication with the oil passage 42, the oil passage 4
The oil that has flowed into the orifice valve 44 from 0 is subjected to the throttling action of the orifice and flows into the oil passage 42. Note that the orifices of the first and second orifice groups 52 and 54 are formed so as to match the communication hole 50 in phase.

Furthermore, a first recess is provided in a portion of the outer circumferential surface of the orifice valve 44 that is symmetrical in the longitudinal direction with respect to the communication hole 50 and is located outside (on the end side) of the first and second orifice groups 52 and 54. A group 64 and a second recess group 66 are respectively formed.
These first and second recess groups 64 and 66 each include two recesses 68 formed at positions 90 degrees apart in the circumferential direction on the outer peripheral surface of the orifice valve 44, as shown in FIG. ing. These recesses 68 are located in any two of the four communication holes 50.
On the other hand, among the portions of the valve body 32 that correspond to the recessed portions located on the side closer to the opening of the dead-end hole 34,
A female threaded hole 70 that penetrates the valve body 32 in the radial direction of the dead-end hole 34 is formed in a portion corresponding to one of the recesses 68 when the communication hole 50 communicates with the oil passage 40 . A lock bolt 72 is screwed into this female threaded hole 70, and when the tip of the lock bolt 72 engages with the recess 68, rotation of the orifice valve 44 is prevented and the orifice valve 44 is positioned in the circumferential direction. In this state, the communication hole 50 is connected to the oil passage 40.
Furthermore, any of the orifices will be in communication with the oil passage 42, and the lock bolt 72 will be in communication with the oil passage 42.
functions as an engaging member, and these lock bolts 7
2. The recess 68 constitutes a fixing means together with the plug 48. Note that the lock bolt 72 is wrapped with seal tape and screwed into the female threaded hole 70.
Liquid tightness between the orifice valve 44 and the valve body 32 is maintained.

Further, female threaded portions 74 are formed at the openings at both ends of the orifice valve 44, and service screws are screwed into the female threaded portions 74 to rotate the orifice valve 44, insert it into the dead end hole 34, and extract it. I'm starting to get it.

In the variable orifice device 30 configured as described above, when changing the orifice communicating with the oil passage 42 to an orifice belonging to the same orifice group, the lock bolt 72 is loosened. After disengaging from the recess 68 and removing the plug 48,
Screw the service screw into 4 and attach the orifice valve 4.
4 is rotated so that the desired orifice is in communication with the oil passage 42. After rotation, the lock bolt 72 is tightened to engage its tip into the recess 68, the service screw is removed, and the plug 48 is screwed into the female thread 38 to fix the orifice valve 44 to the valve body 32.

On the other hand, when changing the orifice communicating with the oil passage 42 to an orifice belonging to a different orifice group from the orifice group to which the orifice belongs,
After disengaging the lock bolt 72 from the recess 68 and removing the plug 48, the orifice valve 44 is pulled out from the dead end hole 34, the orifice valve 44 is reversed 180 degrees in the longitudinal direction, and the bottom surface of the orifice valve 44 is inserted into the dead end hole 34. Insert until it touches. In this way, since the first orifice group 52 and the second orifice group 54 are formed at symmetrical positions in the longitudinal direction with respect to the communication hole 50, the orifices that were aligned with the oil passage 42 before the reversal can be changed. Then, the orifice valve 44 is rotated so that the desired orifice communicates with the oil passage 42, and the lock bolt 72 is rotated.
while tightening the plug 48 to the female threaded part 38.
The orifice valve 44 is screwed onto the valve body 3.
Fixed at 2.

In this way, the orifice valve of this embodiment is provided with two orifice groups, and by reversing the orifice valve 44 by 180 degrees, a desired orifice group can be placed in the oil passage 42, which is the second liquid passage. Therefore, the orifice valve 44 can be provided with many types of orifices.

Also, the orifice valve 44 is connected to the lock bolt 7.
2 and the recess 68 prevents rotation,
Communication hole 50 and oil passage 40, orifice and oil passage 4
2 are fixed in a state where they communicate with each other, so there is no possibility that misalignment will occur between them and the flow of oil will be obstructed.

In the above embodiment, the orifice valve 4 is closed by the engagement between the recess 68 and the lock bolt 72.
The rotation of No. 4 was being blocked, but the rotation of No. 4 was becoming blocked.
As shown in the figure, rotation may be prevented by engagement of the ball 80 with a recess 82 having a triangular cross section formed on the outer peripheral surface of the orifice valve 44. The ball 80 is inserted into the recess 8 of the valve body 32.
It is rotatably and unmovably accommodated in a through hole 84 formed at a position corresponding to 2, and
It is biased in the direction of engagement with the recess 82 by a spring 88 disposed between it and a screw 86 screwed into the female threaded portion of the through hole 84 . In this case,
When the orifice valve 44 is removed from the dead end hole 34, if the orifice valve 44 is moved, the ball 80 is pushed by the slope of the recess 82 and pushed into the through hole 84, and the engagement with the recess 82 is released. Further, when the orifice valve 44 is rotated, the engagement between the ball 80 and the recess 82 is released in the same way, so there is no need to rotate the screw when moving or rotating the orifice valve 44, and the operation is easy. A simple effect can be obtained.

FIG. 7 shows yet another embodiment of the present invention. In this embodiment, the valve hole 90 is a through hole with both ends open. The orifice valve 92 has a bottomed hole 94 that opens at one end in the longitudinal direction, and the opening is closed by a ball 96. The orifice valve 92 also has four communication holes 98 formed in its longitudinal center, and two first communication holes 98 at symmetrical positions in the longitudinal direction with respect to the communication holes 98 as in the previous embodiment. An orifice group 100, a second orifice group 102, a first recess group 104, and a second recess group 106 are formed, and an O-ring 1 is formed between the orifice groups 100, 102 and the recess groups 104, 106, respectively.
08, 110 is fitted into the valve body 112
and orifice valve 92. Further, a tool engaging portion 114 having a hexagonal cross section is formed on one end surface of the orifice valve 92.

On the other hand, the valve body 112 includes a portion that matches the communication hole 98 and a portion that corresponds to the first and second orifice groups 1.
An oil passage 116 and an oil passage 118 are respectively formed in the portion that matches one of the recesses 00 and 102, and a lock bolt 120 is screwed into the portion that matches one of the recesses.
20 and the recess, the orifice valve 92
Relative rotation and longitudinal movement of the valve body 112 is prevented. In this embodiment, the first and second recess groups 104, 106 and the lock bolt 120 constitute the fixing means.

When rotating the orifice valve 92, it is sufficient to disengage the lock bolt 120 from the concave portion, and then engage a tool with the tool engaging portion 114 and rotate the orifice valve 92. When pulling out from the hole 90, it is sufficient to apply force to either end face of the orifice valve 92 and push it.

Note that the first orifice group 52 of the above two embodiments,
100, in the second orifice group 54, 102, the orifices located in the diametrical direction had the same diameter, but they may all have different diameters, and the number of orifices is not limited to four, but as many as possible. You may also provide one. Further, the communication hole may be provided so as to communicate with the first liquid passage in a state where the orifice communicates with the second liquid passage, and the engaging member may be provided with the first liquid passage.
The number of recesses is not limited to the number of recesses, and the number of recesses may be equal to the number of recesses.

Although not illustrated in detail, the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing a variable orifice device according to an embodiment of the present invention. Figures 2, 3 and 4 are - in Figure 1, respectively.
They are a sectional view, a -sectional view, and a -sectional view. FIG. 5 is a hydraulic circuit diagram of a torque converter type forklift equipped with the variable orifice device. FIG. 6 is a front sectional view showing another embodiment of the fixing means including a group of recesses and an engaging member. 7th
The figure is a front sectional view showing a variable orifice device which is still another embodiment of the present invention. FIG. 8 is a front cross-sectional view showing a conventional variable orifice device, and FIG. 9 is a cross-sectional view taken from - in FIG. 8. 10: Torque converter, 30: Variable orifice device, 32: Valve body, 34: Dead end hole, 36: Fitting part, 38: Female thread part, 40, 4
2: Oil passage, 44: Orifice valve, 48: Plug, 50: Communication hole, 52: First orifice group,
54: Second orifice group, 56, 58: Orifice, 64: First recess group, 66: Second recess group, 6
8: recess, 72: lock bolt, 80: ball,
82: recess, 88: spring, 90: valve hole, 92: orifice valve, 100: first orifice group, 102: second orifice group, 104:
First recess group, 106: Second recess group, 112: Valve body, 116, 118: Oil passage, 120: Lock bolt.

Claims (1)

[Scope of Claims] 1. A valve body having a circular cross-section valve hole and first and second liquid passages that respectively intersect with two longitudinally separated locations of the valve hole; and rotatably fitted,
A first comprising a large-diameter communication hole in a portion that coincides with the first liquid passage, and a plurality of orifices with different cross-sectional areas formed at a distance in the circumferential direction in a portion that coincides with the second liquid passage. A variable orifice valve comprising an orifice group, in which one type of the plurality of orifices is brought into communication with the second liquid passage by rotational operation, and a fixing means for immovably fixing the orifice valve to the valve body. In the orifice device, a plurality of orifices having different cross-sectional areas from the first orifice group are arranged at a position opposite to the first orifice group with respect to the communication hole and separated by a distance equal to the distance between the communication hole and the first orifice group. A second orifice group consisting of different types of orifices is formed, and the fixing means is capable of fixing the orifice valve at a position reversed by 180 degrees with respect to the longitudinal direction around the part where the communication hole is formed. A variable orifice device featuring: 2. The fixing means includes a first and a plurality of recesses formed in two circumferentially spaced apart outer peripheral surfaces that are symmetrical in the longitudinal direction with respect to the portion of the orifice valve in which the communication hole is formed. A second recess group; and at least one engagement member provided in the valve body and removably engaged with one of the plurality of recesses to prevent rotation of the orifice valve. The variable orifice device according to range 1. 3. The valve hole is a dead-end hole, and the fixing means is screwed into a female thread formed at the open end of the dead-end hole, and holds the orifice valve between the bottom surface of the dead-end hole and the longitudinal direction of the orifice valve. 3. The variable orifice device according to claim 1, further comprising a plug for fixing the directional position. 4. The communication hole is formed in the longitudinal center of the cylindrical member in which the orifice valve is open at both ends, and the two groups of orifices and the second group of recesses are located at symmetrical positions in the longitudinal direction with respect to the communication hole. Claim 3, each formed
Variable orifice device as described in Section.