JPS625969Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a reservoir equipped with a liquid level detection device for detecting the liquid level in a reservoir such as a brake master cylinder of a vehicle.

The liquid level detection device consists of a switch cylinder housing a reed switch and a float with a magnet that follows the liquid level.When the liquid level drops to a specified lower limit level, the reed switch is activated by the magnet in the float, and the reed switch is activated. Activates the connected alarm in the driver's seat of the vehicle to warn of low liquid level. That is, the liquid level detection device and the alarm constitute a liquid level reduction alarm device. In such a liquid level detection device, it is necessary to confirm whether the detection operation is normal or not. Conventionally, liquid level detection devices equipped with an operation confirmation means to confirm the liquid level detection operation without removing the cap have been used. The device is already known. An example of this is the
The one described in Publication No.-27225 is shown in Figure 2. A switch tube 33 is attached to the cap 32 of the reservoir body 31.
are integrally formed, and a reed switch 34 is disposed within the switch cylinder 33. When the diaphragm 35 descends following the liquid level and the magnet 36 attached to the diaphragm 35 approaches the reed switch 34, the reed switch 34 is turned on and a warning light (not shown) lights up. When confirming the detection operation, use the reed relay coil 37 in the switch tube 33 located near the reed switch 34.
If the warning light lights up at that time, it is determined to be normal, and if it does not, it is determined to be abnormal.

However, when the cap 32 is removed when replenishing the liquid, the switch tube 33 is also removed from the reservoir body 31 along with the cap 32, and the lead wire may come off or be hit during work.
3 may be damaged. In addition, switch tube 3
The liquid adhering to 3 drips into the engine room and contaminates other parts, making it difficult to work. Furthermore, check the liquid level detection operation using the reed relay coil 3.
Since this is done electrically by energizing the reed relay coil 37, housing the reed relay coil 37 in the switch tube 33 and wiring it increases the cost.
It is also necessary to check the reed relay coil 37.

On the other hand, conventionally, there was a reservoir with a liquid level detection device in which a float guide shaft with a built-in reed switch was installed upright at the bottom of the reservoir body.
proposed by No. This is because the shaft with a built-in reed switch is not attached to the cap, so even if the cap is removed when refilling the liquid, the above-mentioned inconvenience will not occur. cannot be confirmed. Furthermore, since the lead wires to the reed switch are routed through the liquid, the insulating coating of the lead wires is corroded by the liquid, resulting in poor durability.

The purpose of this invention is to solve the above-mentioned problems, to be able to check the liquid level detection operation without removing the cap, without increasing the cost, and to allow the lead wire to be connected even if the cap is removed when refilling the liquid. Eliminates dislodgement, damage to the switch tube, and dripping of liquid.
Moreover, it is an object of the present invention to provide a reservoir with a liquid level detection device that can improve the durability of the lead wire.

In order to achieve this purpose, the present invention forms a switch tube through hole at the bottom of the reservoir body, and allows the sliding part formed at the bottom of the switch tube to be inserted from the bottom of the reservoir body through the switch tube through hole. The switch cylinder protrudes outward from the bottom and is fitted with a seal that supports the switch cylinder vertically and movably and maintains liquid tightness between the switch cylinder through-hole and the sliding part of the switch cylinder, and protrudes from the bottom of the reservoir body. A lead wire is led out from the bottom of the reservoir body, and it is equipped with a spring that constantly presses the switch cylinder downward, and a locking part that stops the downward movement of the switch cylinder caused by the spring at the protrusion limit position. It is characterized in that the liquid level detection operation is confirmed by pushing up the sliding part of the switch cylinder that protrudes outward and downward against the spring.

An embodiment of the present invention will be described below with reference to FIG. The reservoir 1 consists of a reservoir body 2 and a cap 3 screwed into the reservoir body 2. The connection port 4 of the reservoir body 2 is connected to a master cylinder (not shown) through a pipe. A switch cylinder through hole 5 is formed at the bottom of the reservoir body 2. Inside the switch tube 6, a reed switch 7 and a resistor 8 are connected in series by a lead wire 9 and supported by a substrate 10, and the substrate 10 is fixed to the switch tube 6 by an adhesive block 11. The lead wire 9 is connected to a warning light 12 and a power source 13 in the driver's seat of the vehicle. The switch tube 6 is arranged vertically inside the reservoir body 2,
A cylindrical sliding portion 15 formed below the locking portion 14 projects downward from the reservoir body 2 through the switch cylinder through-hole 5 . Sliding part 15 and switch tube through hole 5
In addition to keeping the space between the two liquid-tight,
A grommet seal 16 that is in slidable contact with the sliding portion 15 is attached. A spring receiver 17 is in contact with the lower surface of the grommet seal 16 to protect the grommet seal 16, and a spring 19 is attached between the spring receiver 17 and a spring receiver 18 attached to the sliding portion 15. The spring 19 always presses the switch tube 6 downward, and the locking portion 14 comes into contact with the upper surface of the grommet seal 16, thereby stopping the switch tube 6 from sliding downward. That is, the locking portion 14 and the grommet seal 16 which also functions as a locking portion determine the downward protrusion limit position of the switch cylinder 6. A float 20 with a magnet is fitted into the switch cylinder 6 so as to be movable up and down, and a magnet 21 is attached at a position facing the switch cylinder 6. When the liquid level falls to the specified lower limit level, the float 20 with a magnet follows the liquid level and descends, and the magnet 2
1 approaches the reed switch 7 and closes it. As a result, the warning light 12 lights up to warn of a decrease in the liquid level. 22 is the specified upper limit level mark, 2
3 is a specified lower limit level mark, 24 is a diaphragm, and 25 is a diaphragm plate.

To check the operation of the reed switch 7, push the sliding part 15 of the switch cylinder 6 upward against the spring 19. The switch cylinder 6 will rise and the reed switch 7 will approach the magnet 21, so the reed switch 7 performs a closing operation and the warning light 12 lights up. If the warning light 12 does not light up, it can be determined that either the reed switch 7 or the warning light 12 is malfunctioning, or the electric circuit is broken.
After checking, if you release the switch cylinder 6,
The force of the spring 19 causes the switch tube 6 to return to the illustrated position.

Since the grommet seal 16 is an elastic body, it absorbs vibrations in the lateral direction of the vehicle. Also spring 1
9, it also absorbs vibrations in the longitudinal direction of the vehicle. Therefore, the switch cylinder 6 can be protected against vibrations of the vehicle.

Note that the spring 19 does not necessarily need to be attached to the outside of the reservoir 1, and is attached to the reservoir body 2.
It may be provided inside the. Further, the locking portion 14 and the locking portion on the side of the reservoir body 2 that engages with the locking portion 14 do not necessarily need to be provided inside the reservoir body 2, and may be provided outside the bottom of the reservoir body 2.

As explained above, according to the present invention, the switch cylinder through-hole is formed at the bottom of the reservoir body, and the sliding part formed at the lower part of the switch cylinder is inserted from the bottom of the reservoir body through the switch cylinder through-hole. The switch cylinder protrudes outward from the bottom and is fitted with a seal that supports the switch cylinder vertically and movably and maintains liquid tightness between the switch cylinder through-hole and the sliding part of the switch cylinder, and protrudes from the bottom of the reservoir body. A lead wire is led out from the bottom of the reservoir body, and it is equipped with a spring that constantly presses the switch cylinder downward, and a locking part that stops the downward movement of the switch cylinder caused by the spring at the protrusion limit position. The liquid level detection operation is confirmed by pushing up the sliding part of the switch cylinder that protrudes outward and downward against the spring, so the liquid level can be detected without increasing the cost and without removing the cap. You can check the operation. Compared to the conventional type, which confirms the liquid level detection operation by pushing down a magnetic float against its buoyancy, the present invention allows the switch cylinder to be pushed up in the liquid. The tube can be moved without much resistance and can be operated smoothly. In addition, there is no need to attach the switch tube or other parts of the liquid level detection device to the cap, so even if the cap is removed when refilling the liquid, the lead wire may come off, the switch tube may be damaged, or liquid may drip. You can eliminate the drop. Furthermore, since the lead wire does not need to be wired in the liquid, the insulating coating of the lead wire is not corroded by the liquid, and the durability of the lead wire can be improved. This idea is
This is particularly suitable for a reservoir equipped with a diaphragm, such as a motorcycle master cylinder, because the switch tube does not get in the way of the diaphragm.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of an example of a conventional liquid level detection device. 1... Reservoir, 2... Reservoir body, 5...
Switch tube through hole, 6...Switch tube, 7...Reed switch, 9...Lead wire, 12...Warning light, 13...Power source, 14...Locking part, 15...Sliding part, 16... ... Grommet seal, 19 ... Spring, 20 ... Float with magnet, 21 ... Magnet.

Claims (1)

[Scope of utility model registration request] A switch cylinder containing a reed switch is provided, as well as a float with a magnet that follows the liquid level.
In a reservoir with a liquid level detection device that operates a reed switch by the magnet of a magnet-equipped float that drops to a specified lower limit level as the liquid level decreases, a switch cylinder through-hole is formed at the bottom of the reservoir body, and the reed switch is The sliding part formed at the bottom of the cylinder is made to protrude outward and downward from the bottom of the reservoir body through the switch cylinder through-hole, and the switch cylinder is moved up and down between the switch cylinder through-hole and the sliding part of the switch cylinder. A seal is installed to maintain liquid-tightness while supporting the reservoir body, and a lead wire is led out from the bottom of the switch cylinder that protrudes from the bottom of the reservoir body. 1. A reservoir with a liquid level detection device, comprising a locking portion that locks movement at a protrusion limit position.