JPH0352998Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Purpose of the invention] (Industrial application field) This invention relates to an actuator used, for example, in an automatic vehicle speed control device that automatically controls the traveling speed of a vehicle to a certain set value. (Prior Art) Conventionally, for example, there has been an actuator as shown in FIG. 3 as the above-mentioned actuator. That is, the actuator 100 shown in the figure is
A coil spring 1 is installed in a negative pressure chamber 100c formed by a diaphragm 100a and a casing 100b.
00d is provided. The negative pressure chamber 100c
When the negative pressure increases, the output wire 100e is moved to the left in the figure, and when the negative pressure decreases, the output wire 100e is moved to the left in the figure.
The output wire 100e, which is the output end, is connected to a throttle valve of the engine (not shown), and the reference numeral 101 is a vacuum valve, one end of which is connected to the negative pressure. The solenoid 101 is connected to the chamber 100c, and the other end is connected to an engine intake manifold (not shown).
The passage 101b on the intake manifold side is opened and closed by excitation or demagnetization of the magnet a. Reference numeral 102 is a safety valve, one end of which communicates with the negative pressure chamber 100c and the other end of which is open to the atmosphere.
The passage 102b on the atmosphere open side is opened and closed by excitation or demagnetization of the passage 102a. code 1
Reference numeral 03 denotes a vent valve, one end of which communicates with the negative pressure chamber 100c, and the other end of which is open to the atmosphere, and opens and closes the passage 103b to the atmosphere open side by energizing or demagnetizing the solenoid 103a. It's summery. In the actuator 100 having such a structure, when controlling the traveling speed of the vehicle to a certain set value, for example, if the set value is larger than the traveling speed of the vehicle, the safety valve is activated by a signal from a controller (not shown). 102 passage 1
02b and passage 103b of bend valve 103
is closed, and the passage 101b of the vacuum valve 101 is opened. Then, the diaphragm 100a moves to the left in the figure, and the output wire 100a
e is sucked in to increase the running speed of the vehicle and synchronize it with the set value, the passage 101b of the vacuum valve 101 is closed and the vehicle is driven at a constant speed. In addition, if the set value is small compared to the traveling speed of the vehicle, the passage 1 of the vacuum valve 101
By opening the passage 103b of the vent valve 103 to the atmosphere while the passage 103b of the vent valve 103 is closed, the diaphragm 100a moves to the right in the figure by the repulsive force of the coil spring 100d, returns the output wire 100e, and tunes to the set value. At this point, the passage 103b of the vent valve 103 is closed, and the vehicle is driven at a constant speed. When the actuator 100 is not used, that is, when the vehicle is not running at a constant speed, both the safety valve 102 and the vent valve 103 are opened to the atmosphere to return the output wire 100e to the neutral position. (Problems to be Solved by the Invention) However, in the conventional actuator 100 described above, when the safety valve 102 and the vent valve 103 are opened to the atmosphere, dust and the like in the atmosphere enters the negative pressure chamber 100c. There is a problem in that the dust may cause the diaphragm 100a and the vacuum valve 101 to malfunction, resulting in a decrease in airtightness. In order to solve this problem, some filters were attached to the safety valve 102 and the vent valve 103, but this did not solve the problem of dust entering the vacuum valve 101 and reducing the airtightness. I wasn't able to do it. (Purpose of the invention) This invention achieves the above-mentioned results by providing a filter for filtering dust on the safety valve and the vent valve, and providing a filter on the vacuum valve that filters finer dust than the filter provided on the safety valve and the vent valve. The aim is to solve conventional problems.

[Structure of the idea]

(Means for Solving the Problems) An actuator according to this invention includes a vacuum valve including a chamber formed between a diaphragm and a casing, a passage communicating with the negative pressure chamber, and a passage communicating with a negative pressure source; A safety valve and a vent valve each having a passage communicating with the negative pressure chamber and a passage opened to the atmosphere,
A first filter for filtering dust is provided in the passages of the safety valve and the vent valve, and a second filter for filtering finer dust than the first filter is provided in the passage on the negative pressure chamber side of the vacuum valve. The present invention is characterized in that the above-mentioned conventional problems are solved by providing a configuration in which the second filter is installed in a filter storage portion provided in the casing by crimping. In one embodiment, the second filter is attached to a filter storage section provided in the casing by fitting a lid member thereto. (Example) Hereinafter, an example of the actuator according to this invention will be described based on FIG. 1 and FIG. 2. <Embodiment 1> FIG. 1 shows an embodiment of the actuator according to this invention. That is, in the actuator 1 shown in the figure, the reference numeral 2 indicates the diaphragm 3 and the casing 4.
5 is a coil spring, 6 is a vacuum valve whose one end communicates with the negative pressure chamber 2 and the other end communicates with the engine intake manifold, which is a source of negative pressure, and 7 and 8 are vacuum valves formed between A safety valve and a vent valve each having one end communicating with the negative pressure chamber 2 and each having one end open to the atmosphere;
Reference numerals 9 and 10 indicate first filters provided on the atmosphere-opening sides of the safety valve 7 and vent valve 8, respectively, and reference numeral 11 indicates a second filter provided on the negative pressure chamber 2 side of the vacuum valve 6. The diaphragm 3 is adapted to move in the left-right direction in the figure as the capacity of the negative pressure chamber 2 changes between it and the casing 4, and one end is attached to the casing 4 on the negative pressure chamber 2 side at approximately the center. A mounting portion 3a is provided to lock the other end of the coil spring 5 in contact with the coil spring 5, and an output portion 3b serving as an output end is provided on the opposite side of the mounting portion 3a. One end of an output wire 12 is connected to this output part 3b, and the other end of the output wire 12 is connected in parallel to an accelerator wire 14a connected to an accelerator 14 by an accelerator link 13.
is connected to the engine throttle 15. In this embodiment, the casing 4 includes a storage section 4 that integrally accommodates a vacuum valve 6, a safety valve 7, and a vent valve 8, which will be described later.
a, 4b and 4c. On the negative pressure chamber 2 side, that is, on the right side in the figure, passages 4d, 4e, and 4f communicating with the negative pressure chamber 2 are bored, respectively, and on the left side in the figure, passages 4g, 4h, and 4i are bored. ing. A crown-shaped filter housing portion 4j extending toward the negative pressure chamber 2 side is provided on the outer peripheral portion of the passage 4d on the negative pressure chamber 2 side. On the other hand, the vacuum valve 6 is housed in the storage section 4a of the casing 4, and is configured to open or close the passage 4d by means of a solenoid 6a which is energized or deenergized by an input signal from a control unit (not shown). Further, the passage 4g communicates with the intake manifold of the engine. The safety valve 7 is located in the housing section 4 of the casing 4.
The passage 4h is opened or closed by a solenoid 7a which is housed in a solenoid 7b and is energized or demagnetized by an input signal from a control unit (not shown). The vent valve 8 is located in the housing section 4c of the casing 4.
The passage 4i is opened or closed by a solenoid 8a which is energized or deenergized by an input signal from a control unit (not shown). On the other hand, the first filters 9 and 10 have the ability to filter dust, and are provided at the left ends of the passages 4h and 4i, respectively, so that when the safety valve 7 and the vent valve 8 are opened to the atmosphere, , the air introduced into the negative pressure chamber 2 is filtered. The second filter 11 has a filtration capacity higher than that of the first filters 9 and 10, and is housed in a filter storage part 4j provided in the casing 4, and then placed at the open end of the filter storage part 4j. That is, the right end in the figure is the filter 11.
It is attached by crimping it on the side. Note that the reference numeral 12 in the figure indicates the first filter 9,
This is an outer cover attached to the outer part of the 10. In the actuator 1 with the above configuration,
When controlling the running speed of the vehicle to a set value, for example, if the set value is larger than the running speed of the vehicle (actual vehicle speed), the safety valve 7 and the vent valve are controlled by an input signal from a control unit (not shown). 8 is closed and the vacuum valve 6 is opened. Therefore, since the diaphragm 3 moves to the left in the figure and attracts the output wire 12, the opening degree of the engine throttle 15 is increased to increase the running speed of the vehicle and synchronize it to the set value. The vacuum valve 6 is closed in response to an input signal from a control unit (not shown) and the vehicle is driven at a constant speed. In addition, if the set value is smaller than the traveling speed of the vehicle (actual vehicle speed), an input signal from a control unit (not shown) is used to control the vacuum valve 6.
Then, the safety valve 7 is closed and the vent valve 8 is opened, allowing atmospheric air to be introduced into the negative pressure chamber 2 through the first filter 10. As a result, the diaphragm 3 moves to the right in the figure, and the output wire 1
2, the opening degree of the engine throttle 15 is reduced to reduce the vehicle's running speed, and when the speed is synchronized to the set value, the vent valve 8 is closed by an input signal from a control unit (not shown). Drive the vehicle at a constant speed. When the actuator 1 is not in use, the vacuum valve 6 is closed by an input signal from a control unit (not shown), and
Both the safety valve 7 and the vent valve 8 are opened, and the atmosphere is introduced into the negative pressure chamber 2 through the first filters 9 and 10, and the diaphragm 3 becomes in a neutral state. In other words, even if dust that has not been filtered by the first filters 9 and 10 enters the negative pressure chamber when the safety valve 7 or the vent valve 8 is opened to the atmosphere, when the vacuum valve 6 opens, the dust will be transferred to the vacuum valve 6. It is not filtered by the second filter 11 provided on the negative pressure chamber 2 side and does not enter the vacuum valve 6, and unlike the conventional type, dust is less likely to enter and cause a decrease in airtightness. Furthermore, even if, for example, the second filter 11 is clogged with dust and there is some resistance to the introduction of negative pressure at the vacuum valve 6, the output side operation is delayed to provide a fail-safe system, which improves safety. can contribute. <Embodiment 2> FIG. 2 shows another embodiment of the actuator according to this invention. In this embodiment, a filter storage section 4j extending toward the negative pressure chamber 2 side is provided on the outer peripheral portion of the passage 4d bored in the casing 4 on the negative pressure chamber 2 side, and an opening of the filter storage section 4j is provided. A lid member 4m fitted to the end portion and provided with an opening 4k is provided, and other parts are substantially the same as in the first embodiment. Therefore, in the case of this embodiment, even if the second filter 11 is relatively large, it can be installed and will not easily come off.

[Effect of the idea]

As explained above, the actuator according to this invention includes a vacuum valve including a negative pressure chamber formed between a diaphragm and a casing, a passage communicating with the negative pressure chamber, and a passage communicating with a negative pressure source. , a safety valve and a vent valve each having a passage communicating with the negative pressure chamber and a passage opened to the atmosphere; a first filter for filtering dust is provided in the passage of the safety valve and the vent valve; In the passage on the negative pressure chamber side, there is a second filter that filters finer dust than the first filter.
Since the structure is equipped with a filter, it is less likely that dust will enter the vacuum valve and cause a decrease in airtightness, which is the case with conventional valves, and as a result, it has the excellent effect of being able to withstand long-term use. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the actuator according to this invention, FIG. 2 is a longitudinal sectional view showing another embodiment of the actuator according to this invention, and FIG. 3 is a longitudinal sectional view showing a conventional actuator. be. 1... Actuator, 2... Negative pressure chamber, 3...
Diaphragm, 4...Casing, 4d, 4e,
4f, 4g, 4h, 4i... passage, 4j... filter storage section, 4m... lid material, 6... vacuum valve, 7... safety valve, 8... vent valve, 9, 10... first filter, 11...
Second filter.

Claims (1)

[Claims for Utility Model Registration] (1) A vacuum valve having a negative pressure chamber formed between a diaphragm and a casing, a passage communicating with the negative pressure chamber, and a passage communicating with a negative pressure source, and the negative pressure chamber. a safety valve and a vent valve each having a passage communicating with the air and a passage open to the atmosphere, and a first filter for filtering dust is provided in the passage of the safety valve and the vent valve, and a first filter is provided on the negative pressure chamber side of the vacuum valve. An actuator characterized in that the passage is provided with a second filter that filters finer dust than the first filter. (2) The actuator according to claim 1, wherein the second filter is attached by caulking to a filter housing provided in the casing. (3) The actuator according to claim (1), wherein the second filter is attached to a filter storage portion provided in the casing by fitting a cover material thereto.