JPH0244431Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an acceleration cut-off switch that disconnects a load such as a cooler when a power source such as an engine suddenly accelerates, thereby improving acceleration performance.

Conventionally, there has been a switch of this type as shown in Japanese Patent Application Laid-Open No. 57-55214. The switch shown in this patent application uses a vacuum switch that detects the pressure in the engine's intake manifold, and during sudden acceleration, lowers the manifold pressure and activates the vacuum switch.
The cooler is turned off only for a certain period of time.

However, in the case of such a switch, pressure changes in the manifold occur due to fluctuations in engine load, so even when the vehicle is not accelerating rapidly, such as when driving up a long slope, the pressure will be low and the above switch will operate. Not only does the cooler turn off each time, reducing the cooling function, but it also requires an electronic timer.

The purpose of this invention is to provide an acceleration cut-off switch that turns off the switch for a certain period of time only during sudden acceleration to avoid unnecessary load on the power source.

This invention was devised to achieve the above objectives. According to this invention, when a large force is applied to the operating rod, the pressure in the first pressure chamber is rapidly increased, and the pressure is transferred to the second pressure chamber. This pressure is used to turn off the switch and not only keep the switch in the off state for a certain period of time, but also maintain the off state for a certain period of time even if the force applied to the operating rod is suddenly released. It is something.

An embodiment shown in the drawings will be described below. 1
is a cylinder with both ends open and has a partition wall 2 in the center. One side partitioned by this partition wall is the first pressure chamber 3
and the other becomes the second pressure chamber 4.

A piston 5 is slidably housed in the first pressure chamber 3. 6 indicates a ring seal provided on the outer periphery of this piston. This piston 5 has an actuating rod 7 projecting from it, the tip of which abuts against an actuator, such as an accelerator pedal 8 of an automobile. The piston 5 is also provided with an orifice 9 and a small hole 10 spaced apart from each other. These orifices and small holes each communicate the first pressure chamber 3 with the atmosphere. 1
1 is a check valve that always closes the small hole 10 on the first pressure chamber side. A spring 12 is inserted between the piston 5 and the partition wall 2, so that the piston is always deviated upward in the figure.

The partition wall 2 has a first pressure chamber 3 approximately in the center thereof.
It has a through hole 13 that communicates with the second pressure chamber 4,
This through hole is always closed by a check valve 14.

Reference numeral 15 denotes a pore provided in the second pressure chamber 4, which communicates with the atmosphere via a cover described later. 16 is a bottomed cylindrical switch case whose opening is connected to the second switch case.
It faces the pressure chamber 4 of. A diaphragm 17 is mounted in a gas-tight manner between the second pressure chamber and the switch case. 18 indicates packing.

Terminals 19 and 20 are installed in the switch case 16 at a distance from each other, and one terminal 19 has a movable contact 22 connected to it via a switch lever 21.
The other terminal 20 is provided with a fixed contact 23 facing the movable contact. Inside the chamber 24 of the switch 16 is a spring receiver 26 which is always biased upward in the drawing by a spring 25.

A receiver 27 is inserted between the diaphragm 17 and the spring receiver 26.

This receiver is disk-shaped and has a protrusion 28 in the center thereof, and protruding legs 29 (only one is shown) are provided so as to sandwich the protrusion and also sandwich the switch lever 21. and protrusion 2
The tip of 8 is in contact with the switch lever 21, and each leg is in contact with a spring receiver 26.

The switch lever 21 is made to have spring properties so that the movable contact 22 is always biased toward the fixed contact.

30 is a magnetic clutch, and 31 is a power source, and the magnetic clutch is connected to a compressor (not shown). 32 indicates a cover that covers the cylinder 2 and the switch case 16.

Next, the operation of such a switch will be explained. When no force is applied to the access pedal 8, the piston 5 is deflected upward in the figure due to the elasticity of the spring 12, and the first pressure chamber 3 and therefore the second
The pressure chamber of is also maintained at atmospheric pressure, and for this reason
7 is in the state shown in FIG.
is in the on state, and the compressor (not shown) is in the operating state.

However, even if the compressor is on and the cooler is operated, there is no problem because the engine is in normal operation and no unnecessary load is applied.

This state is schematically shown in A of FIG.

Next, when suddenly accelerating the engine due to overtaking or other reasons, the piston 5 is replaced by the accelerator pedal 8,
Since the air in the first pressure chamber 3 escapes from the orifice 9 through the operating rod 7 against the elasticity of the spring 12, the air in the first pressure chamber 3 escapes, but the amount released to the atmosphere is small. The pressure inside the pressure chamber 3 rises rapidly. This pressure opens the check valve 14, acts on the second pressure chamber 4 through the through hole 13, and rapidly increases the pressure in the second pressure chamber.

Therefore, the receiver 27 is lowered via the diaphragm 17, and the leg portions 29 of the receiver push the spring receiver 26 towards the spring 2.
At the same time, the protruding portion 28 presses the switch lever 21. Therefore, the movable contact 22 is separated from the fixed contact 23, and the magnetic clutch 30 is in the disengaged state. When the magnetic clutch 30 is in the disengaged state, the compressor stops operating and the cooler does not work, so no extra load is placed on the engine and the engine can run smoothly even under sudden acceleration.

This state is schematically shown in FIG.

However, if the rapid acceleration state continues as it is and a predetermined period of time elapses, the compressed air in the second pressure chamber 4 is gradually released to the atmosphere from the pores 15, and the pressure in the second pressure chamber 4 gradually decreases. I'll come. When this pressure reaches a predetermined value, the receiver 27 rises as shown in the figure via the spring receiver 26 due to the elasticity of the spring 25, so that the force pressing the switch lever 21 disappears, the movable contact 22 contacts the fixed contact 23, and the magnetic clutch is closed. 30 is turned on, the compressor resumes operation, and the cooler resumes operation. In this way, the engine is subjected to a load from the cooler, but at this time the engine is in a state where it can sufficiently withstand the load, so it can run smoothly.

This state is schematically shown in FIG.

Next, let's talk about a state in which the accelerator pedal is gradually depressed, that is, a state in which the accelerator is slowly accelerated.At this time, unlike the above, the piston 5 descends slowly, so the air in the first pressure chamber 3 is absorbed by the downward movement of the piston. Accordingly, the gas is discharged from the orifice 9 into the atmosphere, and the pressure inside the first pressure chamber 3 does not rise. Therefore, the pressure in the second pressure chamber 4 does not rise and the receiver 27 does not fall, so the movable contact 22 is in contact with the fixed contact 23 and the cooler continues to operate.

However, since the engine is not rapidly accelerating as described above, it is in a state where it can sufficiently withstand the load caused by the operation of the cooler and can operate smoothly.

This state is schematically shown in FIG.

Furthermore, a state in which the accelerator pedal 8 is rapidly depressed and then immediately released will be explained.

When the accelerator pedal 8 is pressed rapidly, the movable contact 22 is moved away from the fixed contact 23 as mentioned above, and the cooling system is not operated to avoid putting unnecessary load on the engine. When the pedal is immediately released, the piston 5 is moved by the spring 12.
Due to the elasticity of the air, it quickly returns to its old position, and the inside of the first pressure chamber 3 becomes temporarily in a negative pressure state, but the air in the atmosphere opens the check valve 11 through the small hole 10 and flows into the first pressure chamber 3. The pressure inside the pressure chamber eventually reaches atmospheric pressure.

However, since the check valve 14 is closed, the pressurized air in the second pressure chamber 4 has no place to escape except through the pore 15, and a sufficient pressure is maintained. For this reason, receive 2
7 is lowered, the movable contact 22 is separated from the fixed contact 23, and the cooler is stopped. In other words, by providing the second pressure chamber 4, even if the accelerator pedal is immediately released after sudden acceleration, the contacts are kept open and the contacts are not turned on and off repeatedly.

This state is schematically shown in FIG.

As described above, in accordance with the present invention, when the power source suddenly accelerates, the contact is always turned off to prevent unnecessary load from being applied to the power source, and when the power source accelerates gradually, even if the load increases, smooth operation is ensured. Moreover, when the accelerator pedal, that is, the actuator is returned immediately after sudden acceleration, the contact is kept in the OFF state, and unnecessary opening/closing of the contact can be prevented.

In the embodiment, a vehicle having a cooler has been described, but the present invention is not limited to this.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of one embodiment of the switch of the present invention, and in FIG. DESCRIPTION OF SYMBOLS 1... Cylinder, 2... Partition wall, 3... First pressure chamber, 4... Second pressure chamber, 5... Piston, 7
... Operating rod, 8 ... Accelerator pedal, 9 ... Orifice, 10 ... Small hole, 11 ... First check valve,
12... Spring, 13... Through hole, 14... Second check valve, 15... Pore, 16... Switch case,
17...Diaphragm, 19,20...Terminal, 21...Switch lever, 22...Movable contact,
23... fixed contact, 25... spring, 26... spring receiver, 27... receiver.

Claims (1)

[Scope of utility model registration request] A cylinder that has a first pressure chamber and a second pressure chamber, and is provided with a partition wall that has a through hole that communicates the two chambers;
It has an operating rod that slides in a first pressure chamber in an airtight state and interlocks with the actuator, and has an orifice and a small hole that communicate the first pressure chamber with the atmosphere, and is always connected to the actuator side by spring pressure. a deviated piston, a bottomed cylindrical switch case that faces the cylinder on the second pressure chamber side, a cover that covers the switch case and the cylinder, and a cover provided in the first pressure chamber. a first check valve that always closes the small hole of the piston, a second check valve that is provided in the second pressure chamber and closes the through hole of the partition wall, and a space between the cylinder and the switch case. a diaphragm airtightly provided in the switch case, terminals provided spaced apart from each other in the switch case, and a fixed contact provided in one terminal;
A movable contact is provided on the other terminal via a switch lever, a spring receiver is provided between the diaphragm and the spring receiver, and one side is in contact with the diaphragm. , an acceleration cutoff switch comprising a receiver, the other of which is in contact with the spring receiver and the other is in contact with the switch lever, and a pore provided in the second pressure chamber so as to communicate with the atmosphere via a cover.