JPH06148031A - Inspection instrument for solenoid valve - Google Patents

Abstract

PURPOSE:To improve operativity of inspection with respect to an inspection instrument for a solenoid valve for performing inspection based on displacement of a pin inserted into a solenoid valve passage. CONSTITUTION:An inspection instrument comprises a first passage 27 extending along a moving direction of a shaft 26 which moves at the time of driving, a second passage 28 communicated with the first passage 27 and a solenoid valve 21 for opening/closing the first passage 27 and the second passage 28 with movement of the shaft 26, wherein a pin 35 is inserted into the first passage 27 so that it is in contact with a shaft 6 and inspection of the solenoid valve 21 is performed based on displacement of the pin 35 at the time of driving, and a fluid supply means 36 for generating a flow of the fluid from the first passage 27 toward the second passage 28 is provided in the inspection instrument. The pin 35 is guided by the flow of the fluid to be inserted into the first passage 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve inspection device, and more particularly to a solenoid valve inspection device for performing inspection based on displacement of a pin inserted in a fluid passage formed in the solenoid valve.

[0002]

2. Description of the Related Art Generally, a solenoid valve is provided in various equipments having a plurality of pipes for controlling a flow rate of a fluid flowing therein, and a predetermined flow rate is controlled by driving the solenoid valve. . Therefore, if the solenoid valve is not driven properly, the accuracy of flow rate control will decrease. Therefore, the inspection of the solenoid valve is performed using an inspection device before shipment or at the time of maintenance.

A conventional solenoid valve inspection device is disclosed in, for example, Japanese Utility Model Laid-Open No. 1-85583.
The inspection device disclosed in the publication is configured to detect the stroke of the valve element provided in the solenoid valve by the position detector and detect the abnormality of the solenoid valve based on the detection result.

[0004]

The above solenoid valve is also incorporated in an automobile, for example, ABS (Antilock Brake S).
ystem) also has a solenoid valve built into the brake system that brakes each drive wheel. FIG. 7 is a sectional view showing a state in which the solenoid valve 2 incorporated in the ABS is attached to the inspection device 1, and FIG. 8 is a sectional view of the inspection device 1.

The solenoid valve 2 is constructed such that when the coil 3 is energized, the shaft 4 moves in the X1 and X2 directions in the drawing. In addition, the solenoid seat 11 disposed under the solenoid valve 2 is formed with a first passage 5 extending along the moving direction of the shaft 4, and the first passage 5 is located near the upper end portion thereof. At the position, a second passage 6 is formed in a direction orthogonal to the extending direction of the first passage 5.

A shaft ball 7 is arranged at the tip of the shaft 4 described above. As the shaft ball 7 moves in the X1 and X2 directions, the first passage 5 is formed.
By inserting / removing the first passage 5 and the second passage 6 at the opposing positions, the throttle amounts of the first passage 5 and the second passage 6 are controlled,
Accordingly, the amount of fluid flowing from the first passage 5 into the second passage 6 can be controlled.

In the solenoid valve 2 having the above structure, the shaft 4
Since the movement accuracy of 1 greatly affects the flow rate control of the fluid flowing from the first passage 5 to the second passage 6, it is necessary to inspect whether the shaft 4 moves properly. The inspection device 1 inspects whether the shaft 4 moves properly.

The inspection device 1 is roughly composed of a mounting base 8 on which the solenoid valve 2 is mounted, a length measuring device 9, and a pin 10 mounted on an upper end portion of the side length measuring device 9. Here, the reason why the pin 10 is provided in the length measuring device 9 is as follows.

That is, in order to detect the movement of the shaft 4, it is necessary to bring the measuring arm 9a of the length measuring device 9 into contact with the shaft 4. On the other hand, the first passage 5 provided in the solenoid valve 2 satisfies the brake characteristics of the ABS control,
As shown in FIG. 9, the orifice portion 12 is formed at the upper position. Since the diameter of the orifice portion 12 is very small (usually φ0.3 to 0.5 mm), the measuring arm 9a having a large diameter cannot be directly inserted into the first passage 5.

Therefore, a pin 10 having a diameter that allows the first passage 5 to be inserted is attached to the tip end of the measuring arm 9a, and the pin 10 is inserted into the first passage 5 and brought into contact with the shaft 4, whereby The moving amount of the shaft 4 has been measured by the length measuring device 9. Therefore, in the inspection device 1, the pin 1 that is thinner (φ0.2 mm) than the diameter of the orifice 12 is used.
It is necessary to insert 0 into the orifice portion 12 of the solenoid valve 2.

Therefore, in the conventional inspection apparatus 1, when the solenoid valve 2 is set on the mounting base 8 and the pin 10 is moved forward by using the lever 9b of the length measuring device 9, the pin 10 is inserted into the orifice portion 12. The axial displacement allowed between the orifice portion 12 and the pin 10 is very small, and the solenoid seat 11 and the pin 1
In many cases, 0 interferes and insertion becomes impossible. Therefore, it is necessary to accurately determine the coaxiality and straightness of the length measuring device 9 and the pin 10, the mounting base 8 and the length measuring device 9, and the solenoid valve 2 and the mounting base 8. However, since the pin 10 is extremely thin as described above,
It is difficult to set the length measuring instrument 9 with good straightness. Further, the diameter clearance of the solenoid valve 2 needs to be reduced in order to secure the coaxiality, but in this case, the mountability to the mounting base 8 becomes poor.

As described above, the conventional inspection apparatus 1 has a problem that the work of inserting the pin 10 into the solenoid valve 2 is troublesome and the workability of the inspection work is deteriorated.

The present invention has been made in view of the above points, and the pin is inserted into the first passage by riding on the fluid flow flowing from the first passage to the second passage. An object of the present invention is to provide a solenoid valve inspection device which improves the workability of inspection work.

[0014]

The above problems can be solved by the following means.

According to the first aspect of the present invention, the first passage extending in the moving direction of the shaft which moves during driving, the second passage communicating with the first passage, and the first passage along with the movement of the shaft are provided. A solenoid valve configured to open and close the passage and the second passage is inserted, a pin is inserted into the first passage so as to come into contact with the shaft, and the solenoid valve of the solenoid valve is moved based on the displacement of the pin during the driving. In an inspection device for an electromagnetic valve that performs an inspection, fluid supply means for generating a flow of fluid from the first passage to the second passage is provided, and the pin is inserted into the first passage by being guided by the fluid flow. It is characterized in that it is configured as.

According to a second aspect of the invention, in the first aspect of the invention, detection means for detecting the flow of the fluid is provided, and abnormality detection of the first and second passages is performed based on the detection result of this detection means. It is configured.

[0017]

According to the invention of claim 1, there is provided a fluid supply means for generating a fluid flow from the first passage toward the second passage,
The pin is inserted into the first passage by being guided by the flow of the fluid by the fluid supply means, so that the pin can be smoothly inserted into the first passage without requiring any insertion work, and workability at the time of inspection can be improved. Can be improved.

According to the second aspect of the invention, the abnormality of the first and second passages can be detected by utilizing the flow of the fluid.

[0019]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 show an inspection device 20 which is a first embodiment of the present invention. FIG.
Is attached, and FIG. 2 shows only the inspection device 20.

The solenoid valve 21 is provided with a coil 22 at an upper outer peripheral position thereof, and the coil 22 has a switch 2
A power supply 23 is connected via 4. This switch 2
When the coil 4 is closed, a current flows through the coil 22, and the magnetic force generated thereby causes the shaft 26 provided therein to move in the direction of arrow X1 in the drawing, and by opening the switch 24, the shaft 26 is opened in the drawing. It is configured to move in the arrow X2 direction.

In addition, the solenoid seat 25 disposed below the solenoid valve 21 has a shaft 26 in which the moving direction (X
A first passage 27 extending along the (1, X2 direction) is formed, and a direction orthogonal to the extending direction of the first passage 27 is formed at a position near the upper end of the first passage 27. A second passage 28 is formed in. The second passage 28 is formed in the casing 29 of the solenoid valve 21.

A shaft ball 30 (detailed in FIG. 5) is provided at the tip of the shaft 26 described above. As the shaft ball 30 moves in the X1 and X2 directions, the first passage 27 is formed. And the second passage 28 are connected to and removed from each other. As shown in FIG. 5, when the shaft 26 moves in the X1 direction and the shaft ball 30 contacts the solenoid seat 25, the first passage 27 is closed, and the first passage 27 and the second passage 28 are separated from each other. It is cut off (this state is indicated by a dashed line). Further, the shaft 26 moves in the X2 direction and the shaft ball 30 separates from the solenoid seat 25, so that the first passage 27 is opened and the first passage 27 and the second passage 28 are communicated (this state). Is shown by a solid line). Further, in the figure, reference numeral 44 denotes an orifice portion formed in the vicinity of the upper end of the first passage 27, which has a smaller diameter dimension than the other portions of the first passage 27 and is used for ABS. It is configured so that a predetermined braking characteristic can be obtained when the vehicle is in use.

Next, the structure of the inspection device 20 will be described. The inspection device 20 roughly includes a mounting table 31 on which the solenoid valve 21 is mounted, a length measuring arm 34 including a length measuring arm 32, a meter portion 33a and a lever 33b, and a length measuring device 34.
35 attached to the upper end portion of the air supply device 3
It is composed of 6 and the like.

The mounting table 31 has a structure in which the solenoid valve 21 is mounted in a guide hole 37 formed inside the mounting base 31, and inside the mounting base 31, in order to ensure airtightness when the solenoid valve 21 is mounted. An O-ring 38 is provided. Also,
An air introduction hole 39 connected to the air supply device 36 is formed on a side portion of the mounting table 31, and an air exhaust hole 40 is formed on an upper portion thereof.

When the solenoid valve 21 is mounted on the mounting base 31, the air introduction hole 39 is configured to communicate with the first passage 27 of the solenoid valve 21, and the air exhaust hole 40 is formed to the second passage.
Is configured to communicate with the passage 28. Therefore, in the state where the solenoid valve 21 is mounted on the mounting base 31, the air supply device 36 → the air introduction hole 39 → the first passage 27 → the second passage 28 → the air exhaust hole 40 has a flow passage in which the air flows in this order. The shaft ball 30 is formed between the first passage 27 and the second passage 28 which are formed in the middle of the passage.

The length measuring device 34 has the fixing portion 33c and the mounting table 31.
The mounting base 31 is fitted into the hole formed in the bottom of the
It is fixed to. Further, the length measuring arm 32 is configured to be displaced in the X1 and X2 directions by operating the lever 33b. When measuring the length, the lever 33b is moved to the position indicated by the alternate long and short dash line to move the lever 33b upward. A pin 35 described below is brought into contact with the shaft ball 30. The pointer value of the meter unit 33a at this time is read (the value at this time is assumed to be L1), and then the coil unit 22 is energized and the shaft 26 is moved.
The moving distance of the shaft 26 can be measured by reading the pointer value of 3a (provisionally, the value at this time is L2) and taking the difference between the read value L1 and the read value L2 after the shaft is moved.

Here, pay attention to the mounting portion of the pin 35 of the length measuring arm 32. FIG. 3 is an enlarged view showing a mounting portion of the pin 35 of the length measuring arm 32. As shown in the figure, a bottomed mounting hole 41 is formed at the tip of the length measuring arm 32, and the pin 35 is inserted and mounted in this mounting hole 41. That is, the pin 35 has the mounting hole 4
It is not fixed inside 1, but is inserted loosely. Therefore, the pin 35 is configured to be swingable in the mounting hole 41 as indicated by an arrow in the drawing and also movable in the X1 and X2 directions.

The air supply device 36 is provided with an air valve 42, a flow rate control valve 43, etc. inside thereof, and is configured to supply a constant flow rate of air to the air introduction hole 39.

Next, the operation of the inspection device 20 having the above-described structure during inspection will be described. At the start of the inspection, attach the solenoid valve 31 to be inspected to the attachment table 31,
Then, the lever 33b of the length measuring device 34 is operated to move the length measuring arm 32 upward in the X2 direction. At this time, the measuring arm 32
The length-measuring arm 32 is moved up to a position where the tip of the pin 35 attached to the tip of the position reaches the lower portion near the orifice portion 44. That is, in the conventional case, the work of inserting the pin 35 into the orifice portion 44 was performed at this time, but in the present invention, the pin 35 is still located at the lower portion of the orifice portion 44 at this time. There is.

As described above, the pin 35 (measuring arm 32)
Is moved up, the air supply device 36 is subsequently driven. By driving the air supply device 36, a constant flow rate of air flows in the order of the air supply device 36 → the air introduction hole 39 → the first passage 27 → the second passage 28 → the air exhaust hole 40. At this time, the shaft ball 30 is connected to the solenoid seat 2
The switch 24 is operated so that the switch 24 is separated from the switch 5.

Here, FIG. 5 is an enlarged view showing the vicinity of the orifice portion 44 in the state where the air flows as described above.
As shown in the figure, the air flowing through the first passage 27 is throttled by the orifice portion 44, so that the flow velocity increases and passes through the orifice portion 44. On the other hand, as described above, the pin 35 is loosely fitted into the mounting hole 41 formed at the upper end of the length measuring arm 32. Therefore, when air having a high flow velocity flows through the orifice portion 44 as described above, the pin 35 rides on this air flow and is inserted into the orifice portion 44 while being guided by the air flow. Therefore, the pin 3 is not particularly required to be inserted into the orifice portion 44.
Since No. 5 is smoothly inserted into the orifice portion 44 (inserted through the first passage 27), workability at the time of inspection can be improved.

When the pin 35 is inserted into the orifice portion 44 as described above, the lever 33b of the length measuring instrument 34 is subsequently operated again to move the length measuring arm 32 upward in the X2 direction, and the pin 3
5 is brought into contact with the shaft ball 30. Since the following measurement procedure is the same as the conventional one, its explanation is omitted.

By the way, when the pin 35 is loosely fitted into the mounting hole 41 formed at the upper end of the length measuring arm 32 as described above, the pin 35 swings in the mounting hole 41. The influence of detection accuracy becomes a problem. Figure 4
FIG. 8 is a diagram showing an influence when the pin 35 swings in the mounting hole 41. Now, as shown in FIG.
Has a length H of 15 mm, a diameter 35 of the pin 35 is 0.25 mm, a depth h of the mounting hole 41 is 4.3 mm, a diameter n of the mounting hole 41 is 0.4 mm, and a diameter R of the end of the pin 35 is 0.3 mm. Assuming that the rocking range θ is about 1 ° as shown in FIG. 7B, the displacement amount Δ in the X direction in the figure at the tip of the pin 35 is Δ.
X is about 0.262 mm, and the displacement amount ΔY in the Y direction in the figure is about 2.3 μm. This displacement amount does not pose a problem from the viewpoint of the measurement accuracy of the solenoid valve 21.

FIG. 6 shows an inspection device 50 which is a second embodiment of the present invention. In the figure, the same components as those shown in FIGS. 1 and 2 are designated by the same reference numerals and the description thereof will be omitted.

The inspection apparatus 50 according to this embodiment is characterized in that a flow rate measuring device 51 for measuring the flow rate is provided between the air supply device 36 and the air introduction hole 39. As described above, the flow rate measuring device 51 uses the air supply device 36 →
The flow rate of the air flowing in the order of the air introduction hole 39, the first passage 27, the second passage 28, and the air exhaust hole 40 is measured.

Now, assuming that each of the above-mentioned components through which air flows is normal, the flow rate value measured by the flow rate measuring device 51 is a predetermined value, but suppose that an abnormality occurs in each component. If so, the flow rate value measured by the flow rate measuring device 51 becomes a value different from the preset value.

Specifically, when clogging occurs in each of the above constituent elements due to dust or the like, the flow rate value measured by the flow rate measuring device 51 is smaller than the predetermined value.
On the contrary, when a leak occurs in each of the above-mentioned components, the flow rate value measured by the flow rate measuring device 51 becomes a value larger than the default value.

Explaining with concrete numerical values, when air of 0.05 atm is introduced from the air supply device 36, when the diameter of the orifice portion 44 is φ0.5 mm, the flow rate is
The flow rate is 800cc / min. Similarly, when the diameter is φ0.57mm, the flow rate is about 1100cc / min, and when the diameter is φ0.8mm, the flow rate is about 1500cc / min. Therefore, the diameter dimension of the orifice portion 44 is obtained in advance and the flow rate measuring device 5
When the flow rate value measured by 1 deviates from the above-mentioned predetermined value, it can be determined that an abnormality has occurred in the air flow path in the solenoid valve 21.

Therefore, based on the flow rate value measured by the flow rate measuring device 51, it is possible to detect an abnormality in each of the components through which the air flows, including the first passage 27 and the second passage 28. Thus, the inspection device 50 according to the second embodiment.
According to this, it is possible to simultaneously perform an abnormality inspection using the length measuring device 34 as to whether or not the movement of the shaft 26 is appropriate and an abnormality inspection of the air flow path formed in the solenoid valve 21.

[0040]

As described above, according to the invention of claim 1, the fluid supply means for generating the flow of the fluid from the first passage to the second passage is provided, and the fluid flow is guided by the fluid supply means. Since the pin is inserted into the first passage and smoothly inserted into the first passage without requiring any particular insertion work, the workability at the time of inspection can be improved. Have.

According to the invention of claim 2, while improving the workability at the time of inspection as described above, in addition to this, the abnormality of the first and second passages can be detected by utilizing the flow of the fluid. It has the feature that it can be performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a solenoid valve is mounted on an inspection apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the inspection device according to the first embodiment of the present invention.

FIG. 3 is an enlarged view showing the vicinity of the tip of the length measuring arm.

FIG. 4 is a diagram for explaining the influence of measurement accuracy due to the swing of the pin.

FIG. 5 is an enlarged view showing the vicinity of an orifice portion.

FIG. 6 is a sectional view of an inspection device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a state in which a solenoid valve of a conventional inspection device is mounted.

FIG. 8 is a cross-sectional view of a conventional inspection device.

FIG. 9 is an enlarged view showing the vicinity of an orifice portion of a conventional inspection device.

[Explanation of symbols]

 20, 50 Inspection device 21 Solenoid valve 22 Coil 25 Solenoid seat 26 Shaft 27 First passage 28 Second passage 29 Casing 30 Shaft ball 31 Mounting table 32 Measuring arm 34 Length measuring instrument 35 Pin 36 Air supply device 37 Guide hole 39 Air introduction hole 40 Air exhaust hole 41 Mounting hole 44 Orifice part 51 Flow rate measuring device

Claims (2)

[Claims] 1. A first passage extending in a moving direction of a shaft which moves during driving, a second passage communicating with the first passage, and the first passage and the first passage as the shaft moves. Second
Is mounted with a solenoid valve configured to open and close the passage, and a pin is inserted into the first passage so as to come into contact with the shaft, and the solenoid valve is inspected based on the displacement of the pin during the driving. In a solenoid valve inspection device, fluid supply means for generating a fluid flow from the first passage to the second passage is provided, and the pin is inserted into the first passage under the guidance of the fluid flow. An inspection device for a solenoid valve having the above-mentioned configuration. 2. The structure according to claim 1, further comprising a detection means for detecting the flow of the fluid, and detecting the abnormality of the first and second passages based on the detection result of the detection means. Characteristic solenoid valve inspection device.