JPS6118424Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in 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 near the specified lower limit level, the reed switch is activated by the magnet in the float, and the reed switch is activated. Activates the alarm in the driver's seat of the vehicle connected to the vehicle to warn of a decrease in the liquid level. That is, the liquid level detection device and the alarm constitute a liquid level reduction alarm device. In conventional reservoirs with liquid level detection devices, the switch tube is supported by the reservoir cap, so when the cap is removed to replenish or replace brake fluid in the reservoir, the switch tube also comes off. Since the lead wire coming out of the switch tube is connected to the power supply and alarm, the length of the lead wire restricts the space where the cap can be placed, and brake fluid dripping from the switch tube can cause damage to the engine. This may cause inconveniences such as the room becoming dirty. In addition, if the cap has a threaded part on the inner wall and the cap is screwed into the reservoir body, turning the cap will twist the lead wire, so it is necessary to disconnect the lead wire from the power supply and alarm. It didn't happen.

An object of the present invention is to provide a reservoir with a liquid level detection device that allows the cap to be freely removed from and separated from the reservoir body without being restricted by lead wires.

An embodiment of the present invention will be described below with reference to the drawings. The reservoir 1 consists of a reservoir body 2 and a cap 3 that covers the upper opening of the reservoir body 2. The reservoir 1 is fitted into a reservoir mounting portion 5 of a master cylinder main body 4 and fixed with a band 6. A cylinder hole 7 provided in the master cylinder body 4 and the inside of the reservoir 1 communicate with each other via a supply port 8 and a relief port 9.

The cap 3 has two tongues 10 as shown in FIG. The tongue piece 10 engages with engaging protrusions 11 and 12 (FIG. 4) provided on the outer surface of the reservoir body 2 when the cap 3 is attached to the reservoir body 2. A convex portion 1 is provided above the tongue piece 10.
3 is formed. A locking portion 15 is provided in a recess 14 provided inside the center of the cap 3. Two first conductive pieces 16 are fixed to the cap 3 by integral molding with the cap 3 or by other methods,
One terminal 17 is arranged on the convex portion 14, and
The other terminal 18 indicates that the cap 3 is connected to the reservoir body 2.
The tongue piece 10 is disposed at a portion of the tongue piece 10 that comes into contact with the engagement protrusion 12 of the reservoir body 2 when the tongue piece 10 is attached to the reservoir body 2 .

The switch cylinder 19 is formed by integrally forming a switch cylinder main body 20 and a seal holding part 21, and a reed switch 22 and a resistor 23 are housed in the switch cylinder main body 20. A float 24 with a magnet is arranged around the switch cylinder main body 20 so as to be movable up and down, and a permanent magnet 25 for operating the reed switch 22 is attached to the float 24 with a magnet. A lower limit stopper 26 is attached to the lower end of the switch cylinder body 20, and the lower limit position of the magnetized float 24 is determined. A seal groove 27 is provided at the periphery of the seal holding portion 21, and a seal 28 is fitted into the seal groove 27. The seal 28 contacts the inner surface of the reservoir body 2 and prevents brake fluid from leaking. A lead wire 29 coming out of the switch cylinder body 20 is connected to a contact piece 31 provided between the ribs 30, as shown in FIG. The contact piece 31 is fixed to the seal retainer 21 by integral molding or other methods. A convex portion 32 that engages with the locking portion 15 of the cap 3 is provided on the upper part of the switch tube 20. When the convex portion 32 engages with the locking portion 15, the switch tube 19 is supported by the cap 3. Ru.

Two second conductive pieces 33 are embedded in the reservoir body 2 by integral molding, and one terminal 34
is exposed at the portion of the engaging protrusion 12 that contacts the other terminal 18 of the first conductive piece 16 when the cap 3 is attached to the reservoir body 2. The other terminal 35 is connected to an external connector 36. The external connector 36 is connected to a power source 37 and a warning light 38. In FIG. 4, 39 is a tongue piece guide;
0 is the specified upper limit level, and 41 is the specified lower limit level.

When assembling reservoir 1, cap 3
The switch tube 19 is attached to the cap 3 by engaging the convex portion 32 of the switch tube 19 with the locking portion 15 of the cap 3 so that the convex portion 13 of the switch tube 19 is positioned between the ribs 30 of the switch tube 19. At this time, the contact piece 31 comes into contact with one terminal 17 of the first conductive piece 16, and the lead wire 29 is connected to the first conductive piece 16. While inserting the switch tube 19 into the reservoir body 2, insert the cap 3 into the reservoir body 2.
Cover the upper opening of the tongue piece guide 3 with the tongue piece 10.
9 and turn cap 3 clockwise. As a result, the tongue piece 10 is separated from the tongue piece guide 39,
When the cap 3 is guided to the lower surface of the engagement protrusion 11 and passes over the peak 42, the cap 3 is attached.
In this state, the other terminal 18 of the first conductive piece 16 is joined to one terminal 34 of the second conductive piece 33, and the first conductive piece 16 and the second conductive piece 33 are connected. Thus, power supply 37 - external connection connector 3
6 - Second conductive piece 33 - First conductive piece 16 - Contact piece 3
1-Lead wire 29-Resistance 23-Reed switch 2
2-Lead wire 29-Contact piece 31-First conductive piece 16
An electric circuit of - second conductive piece 33 - external connection connector 36 - warning light 38 - ground - power supply 37 is formed. Therefore, the brake fluid is at the specified lower limit level 40.
When the liquid level decreases to approximately , the magnetic float 24 descends to the position shown in FIG. 1, the reed switch 22 closes due to the action of the permanent magnet 25, and the warning light 38 lights up to warn of a decrease in the liquid level.

When replenishing or replacing the brake fluid, turning the cap 3 counterclockwise will disengage the tongue piece 10 from the engaging protrusions 11 and 12, making it possible to remove the cap 3 and switch tube 19 from the reservoir body 2. can. At the same time, the electrical connection between the first conductive piece 16 and the second conductive piece 33 is also disconnected.

The mounting structure between the cap 3 and the reservoir body 2 is
A female threaded portion is provided on the inner surface of the cap 3, and a threaded portion is provided on the upper outer surface of the reservoir body 2.
If the cap is of the type that is screwed onto the reservoir body 2, the first conductive piece 16 is embedded in the cap 3,
The terminal 17 is exposed toward the inside of the cap, and the terminal 18 is exposed at a portion of the second conductive piece 33 that contacts the terminal 34 when the cap is attached.

The connection structure between the lead wire 29 and the terminal 17 of the first conductive piece 16 is not limited to the one using the contact piece 31. For example, if the lead wire 29 is made longer,
Connect a connector to the tip of the lead wire 29, and before attaching the switch tube 19 to the cap 3, connect the connector to the terminal 17, and connect the connector and lead wire 2.
The switch tube 19 may be attached to the cap 3 while fitting the switch tube 9 between the ribs 30.

Although the two external connectors 35 are provided 180 degrees apart, one of the second conductive pieces 33 may be extended by half a circumference, and the two external connectors 35 may be provided side by side.

In the present invention, the cap is connected to a lead wire and the first conductive piece is fixed, the second conductive piece connected to the external connector is embedded in the reservoir body, and the first conductive piece is attached to the reservoir body while the cap is attached to the reservoir body. Since the cap and the second conductive piece are bonded and connected, it is possible to eliminate the lead wire that restricts the carrying of the cap and switch tube when the cap and switch tube are removed from the reservoir body. Therefore, the cap can be freely removed from the reservoir body,
This eliminates the possibility of contaminating the engine compartment with brake fluid dripping from the switch cylinder. Furthermore, even if the cap is of the type that is screwed into the reservoir body, the cap can be removed without twisting the lead wire.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of the cap, FIG. 3 is a perspective view of the switch barrel, and FIG. 4 is a perspective view of the reservoir body. 1... Reservoir, 2... Reservoir body, 3...
Cap, 16... First conductive piece, 17, 18...
Terminal, 19... Switch tube, 22... Reed switch, 24... Float with magnet, 25... Permanent magnet, 29... Lead wire, 33... Second conductive piece, 3
4, 35...terminal, 36...external connection connector.

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 equipped with a liquid level detection device that operates a reed switch using the magnet of a magnet-equipped float when the liquid level decreases to around the specified lower limit level, a first conductive piece is fixed to the cap, and a first conductive piece is fixed to the cap. Connect one terminal to the lead wire coming out of the switch tube, place the other terminal of the first conductive piece on the part of the cap that contacts the reservoir body when the cap is attached to the reservoir body, and place the second terminal on the reservoir body. A second conductive piece is embedded, one terminal of the second conductive piece is exposed in the part of the reservoir body that contacts the other terminal of the first conductive piece when the cap is attached to the reservoir body, and the second conductive piece is embedded. 1. A reservoir with a liquid level detection device, characterized in that the other terminal of the piece is connected to an external connector provided on the reservoir body.