JPH0244432Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an acceleration cut-off switch that turns off a load such as a cooler when a power source such as an engine suddenly accelerates to improve 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. During sudden acceleration, the switch lowers the manifold pressure, activates the vacuum switch, and turns off loads such as the cooler for a certain period of time. be.

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 cooling machine turn off each time something happens and the cooling function deteriorates, but also an electronic timer or the like is required.

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 proposal was devised to achieve the above objectives, and according to this proposal, the cylinder is connected to the first
The pressure chamber is divided into two, a pressure chamber and a second pressure chamber, and the piston provided in the first pressure chamber is slid in the first pressure chamber at rapid acceleration via an actuator and an actuator rod. The pressure in the first pressure chamber is rapidly increased, this pressure is guided to the second pressure chamber, and the reversing plate installed in the second pressure chamber is reversed to turn off the contact, cut off the load on the cooler, etc., and suddenly accelerate. This system is designed to avoid applying a load to the power source at times, and to keep the contacts in the OFF state for a certain period of time.

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

A piston 5 is slidably housed in the first pressure chamber 3. 6 indicates a seal ring 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 communicate the first pressure chamber 3 with the atmosphere.

Reference numeral 11 denotes a first 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 to constantly deviate the piston upward in the figure.

The partition wall 2 has a first pressure chamber 3 approximately in the center thereof.
The pressure chamber 4 has a through hole 13 that communicates with the second pressure chamber 4, and this through hole is always closed by a second 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. Reference numeral 16 is a dish-shaped receiver that faces the cylinder 1 with its recess facing the second pressure chamber 4 . A diaphragm 17 is airtightly attached between the cylinder 1 and this receiver 16. 18 is this diaphragm 17
The reversing plate supported by the receiver between the receiver 16 and the receiver 16 is shown. 19 is an opening provided in the center of the receiver 16. A packing 20 is inserted between the cylinder 1 and the receiver 16. A bottomed cylindrical switch case 21 faces the receiver 16 and is supported by a cover 22 together with the cylinder 1 and the receiver 16. Terminals 23 and 24 are buried in the switch case 21 at a distance from each other, and one terminal 23 is buried in the switch case 21.
A movable contact 26 is provided on the other terminal 24 via a switch lever 25, and a fixed contact 27 is provided on the other terminal 24 so as to face this movable contact. However, the switch lever 25 has a spring property, and the movable contact is always connected to the fixed contact.

Reference numeral 28 denotes an operating rod that is provided between the reversing plate 18 and the switch lever 25 through the opening 19 of the receiver 16. 29 is connected to a compressor (not shown) by a magnetic clutch.

Next, we will discuss the operation of this switch. 1st
In the figure, no force is applied to the accelerator pedal 8, so the engine rotates normally and the vehicle runs normally. In this case, the piston 5 is rising in the figure due to the elasticity of the spring 12, and the first pressure chamber 3
does not generate any pressure, therefore the second pressure chamber 4
However, no pressure is generated, so the reversing plate 18 maintains a convex state toward the second pressure chamber 4 as shown in FIG. Yes, the magnetic clutch is engaged, the compressor is running, and the cooler is working. In this way, even when the cooler is in operation, the engine is rotating normally and no heavy load is applied to it, so the engine can run safely without stalling.

Next, the case where the accelerator pedal 8 is rapidly depressed, that is, the case where the engine is suddenly accelerated will be explained.

In this case, the piston 5 is rapidly moved downward in the figure in the first pressure chamber 3 via the operating rod 7 against the elasticity of the spring 12. Due to this rapid movement of the piston, the pressure inside the first pressure chamber 3 increases rapidly, and this pressure is transmitted to the second pressure chamber 4 via the through hole 13 and the second check valve 14, and is transmitted to the second pressure chamber 4 through the through hole 13 and the second check valve 14. pressure chamber 4
The internal pressure also increases. For this reason, the reversing plate 18 is
The actuating rod 28 moves downward in the figure and presses the switch lever 25 to separate the movable contact 26 from the fixed contact 27. Therefore, the magnetic clutch 29 is disengaged, the compressor stops, and the cooler also stops operating. This state is shown in FIG.

In this way, when the engine is suddenly accelerated, the cooler stops, so no extra load is placed on the engine, and the vehicle can run safely without stalling.

Further, when this state is maintained, the compressed air in the second pressure chamber 4 is gradually released to the atmosphere through the pores 15, and the pressure in the second pressure chamber gradually decreases. When this pressure drop reaches a predetermined position, the reversing plate 18 is reversed again to return to the state shown in FIG. 1, and the movable contact 26 comes into contact with the fixed contact 27 again, and the cooler starts operating.
However, at this point, the predetermined time has elapsed and the engine has sufficiently increased its rotation to withstand this load, so accidents such as engine stalling do not occur and the vehicle can travel safely.

If the reversing plate is not provided, when the pressure in the second pressure chamber 4 decreases, the movable contact 26 comes into contact with the fixed contact 27 with almost no delay time, so the contact repeatedly turns on and off each time the pressure increases and decreases. This would have resulted in so-called chattering and damage to the contacts, but according to the present invention, such a problem does not occur and the situation is satisfactory.

Next, a state in which the accelerator pedal 8 is quickly depressed and then immediately released as described above will be described. At this time, the piston 5 quickly returns to the position shown in FIG. The reversing plate 18 maintains the state shown in FIG. 2, so the contacts are in the open state, the arrow cooler is stopped, and no load is applied to the engine, allowing safe running as described above. .

As described above, when the power source is suddenly accelerated, the contact is always turned off for a predetermined period of time to prevent unnecessary load from being applied to the power source, so stable operation can always be achieved without the power source malfunctioning. It is.

In the above description, the acceleration cutoff switch is used in a vehicle equipped with a cooler, but the present invention is not limited to this.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing the switch according to the present invention in a closed state, and FIG. 2 is a similar vertical cross-sectional view showing the switch in an open state. 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... Receptacle, 17... Diaphragm, 18... Reversing plate, 19... Opening,
21...Switch case, 22...Hippo, 23,
24...Terminal, 25...Switch lever, 2
6... Movable contact, 27... Fixed contact, 28... Operating rod.

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 dish-shaped receiver that faces the cylinder on the side of the second pressure chamber and has an opening in the center; a diaphragm that is airtightly attached between the receiver and the cylinder; A reversing plate provided between the diaphragm and the receiver, a bottomed cylindrical switch case facing the receiver, a pair of terminals provided at a distance from each other with respect to the switch case, and one terminal connected to the switch case. a fixed contact provided, a movable contact provided on the other terminal via a switch lever and facing the fixed contact, an operating rod located between the reversing plate and the switch lever through an opening in the receiver, and a movable contact provided on the other terminal via a switch lever; A first check valve that always closes the small hole, a second check valve that always closes the through hole of the partition wall, a cover that covers the cylinder and switch case, and a cover that is connected to the second pressure chamber through a cover. An acceleration cut-off switch consisting of a pore provided so as to communicate with the atmosphere.