JPS6130936Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oil level detection warning check mechanism provided in a reservoir such as a master cylinder in a vehicle brake system.

[Prior art]

Generally, in this type of oil level detection and warning device, a reed switch is provided in a hanging bottomed cylinder of a cap that is fitted into the reservoir body, and the reed switch is moved vertically around the outer circumference of the bottomed cylinder. It is configured to be actuated by a magnet disposed on the inner periphery of the annular float, which can be assembled, to detect an insufficient amount of hydraulic oil contained in the reservoir body and to activate a warning lamp or a warning buzzer. ing. Therefore, this type of device has the advantage of being able to accurately determine if there is a shortage of hydraulic oil and replenish it, but this type of device has the advantage that the hydraulic oil in the reservoir body is sufficient. It is desirable to provide a check mechanism that can check the detection function even when the detection function is present.

In order to deal with this problem, Japanese Utility Model Application Publication No. 54-50590 discloses an oil amount detection device in which the cap is provided with a push rod capable of pushing the float downward. Thus, with this device, the detection function can be checked by moving the float to the operating position by pushing the push rod.

[The problem that the invention attempts to solve]

However, the head of the push rod of the same device is only latched to a part of the cap and faces above the float, so when the float is pushed to the operating position by the push rod, the float is moved to the bottomed position. It descends in an unstable state of support, with its periphery swinging up and down around the cylindrical body, and the push rod must be pushed downward more than necessary in order to reliably operate the reed switch. Further, when the float descends, it may become inclined, and the inner periphery and the outer periphery of the bottomed cylinder may engage with each other, and in this case, the float cannot descend any further. Furthermore,
The push rod is supported by simply locking its head into a part of the cap, so if the vehicle vibrates significantly, the push rod pushes the float and activates the reed switch, generating a temporary warning. There is a risk of causing

[Means for solving problems]

In order to deal with these problems, the present invention provides an oil level detection and warning device of this type, in which the cap is provided with a mounting hole that passes through the cap in the vertical direction, and an intermediate portion of the mounting hole is engaged with the cap. An externally operable rod equipped with a stopper for restricting upward movement is assembled so as to be movable up and down, and this rod is supported by being biased upward by a spring whose one end is fixed to the cap. The lower end of the rod is provided with an annular or semi-annular arm that extends around the bottomed cylinder and abuts the upper surface of the float.

[Functions and effects of the idea]

Accordingly, in the present invention, when the rod is pushed against the spring, the float is pushed down by the arm and the reed switch is actuated to check the operation of the oil amount detection device. In this case, the float is supported in a stable state by the arm to prevent it from swinging in the hydraulic oil, and descends smoothly in this stable state. Therefore, the reed switch can be operated reliably without unnecessarily pushing the rod downward.

In addition, in this invention, the rod is supported by being biased upward by the stopper and the spring, so even if the vehicle vibrates significantly, the rod will not push the float and cause the reed switch to malfunction. Never.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. The reservoir 10 shown in FIG.
0 is inserted. The cap 20 consists of a cap body 21 and a bottomed cylindrical body 22 that is fitted in the center of the cap body 21 in a hanging manner. A synthetic resin float 32 is attached to the lower outer periphery of the bottomed cylinder 22 so as to be movable in the vertical direction. The float 32 is prevented from coming off by a stopper 23, and a magnet 33 for actuating the reed switch 31 is disposed on the inner circumference thereof. The reed switch 31 and the magnet 33 detect an insufficient amount of brake oil (the oil level is shown by a phantom line) stored in the reservoir body 11 and activate a warning lamp or a warning buzzer (not shown). A reed switch 31 is a component of the amount detection and warning device 30, and is connected by a conductive wire 34 to a warning lamp or a warning buzzer provided in the vehicle interior.

Therefore, in this embodiment, the cap body 21 and the bottomed cylindrical body 22 are provided with mounting holes 21a and 22a that pass through the cap 20, and a steel rod 41 that can be operated from the outside is inserted into the mounting holes 21a and 22a. are assembled so as to be movable up and down, thereby forming a check mechanism 40 of the oil amount detection/warning device 30.
The rod 41 has an arm 42 made of oil-resistant synthetic resin at its lower end that comes into contact with the upper surface of the float 32, an operating knob 43 at its upper end, and a seat 4 provided in the mounting hole 21a of the cap body 21 at its middle part.
stopper 4 that engages with 5 to restrict upward movement;
4, and is urged upward and supported by a compression coil spring 46 whose lower end is engaged with the seat 45 and whose upper end is engaged with the operation knob 43. As shown in FIG. 2, the arm 42 extends in a U-shape (approximately half annular shape) around the bottomed cylinder 22 and is in planar contact with the upper surface of the float 32. has a stopper mechanism to prevent the float 32 from dancing in the brake oil, and when the rod 41 is pushed downward, the float 32
can be forcibly lowered to check whether the oil amount detection/warning device 30 is operating properly (detection function). Further, in this embodiment, a rubber cover 25 is attached to the upper center of the cap 20. cover 25
has a notch 25a at the lower end that forms a breather with the mounting holes 21a and 22a, and a retractable bellows 25b at the upper end, and the upper end of the bellows 25b is attached to the operating knob 43 in a fluid-tight manner. It is being

In this embodiment configured in this way, the rod 41 is
is urged upward by the coil spring 46,
If the stopper 44 is engaged with the seat 45, the rod 41 does not move even due to vibrations and shocks generated as the vehicle runs, and the required amount of brake oil is contained in the reservoir body 11, float 32
Due to its buoyancy, it comes into contact with the arm 42 and does not move. Therefore, at this time, the reed switch 31
does not operate, and the warning lamp or warning buzzer does not operate. Further, when the brake fluid in the reservoir body 11 decreases and the float 32 descends to the position shown by the imaginary line, the magnet 33 approaches the contact point of the reed switch 31, and the reed switch 31 is activated. Therefore, at this time, a warning lamp or a warning buzzer is activated, allowing the driver to confirm that the amount of brake fluid is insufficient.

Furthermore, when the required amount of brake oil is stored in the reservoir body 11, if the rod 41 is pushed downward against the coil spring 46, the float 32 is forcibly lowered by the arm 42, and the oil is removed. It is possible to check whether the amount detection/warning device 30 is operating properly. By the way, at this time, the arm 42
is in planar contact with the upper surface of the float 32,
Since the float 32 is accurately lowered to a predetermined position (the position indicated by the imaginary line) without tilting, the reed switch 31 can be operated reliably without unnecessarily pushing the rod 41 downward. The check operation can be performed easily and reliably. Furthermore, in this embodiment, as described above, since the reed switch 31 can be operated without unnecessarily pushing the rod 41 downward, the protrusion length of the rod 41 from the cap 20 can be reduced. The check mechanism 40 can be made compact.

In addition, in this embodiment, the rod 41 is supported by being biased upward by the coil spring 46, so even if the vehicle vibrates greatly, the rod 41 pushes the float 32, preventing the reed switch 31 from being erroneously activated. There is no way to activate it.

In this embodiment, since the cap 20 is not removed from the reservoir body 11 during the check operation, it goes without saying that impurities will not be mixed into the brake fluid in the reservoir body 11 from the outside, and the arm 42 is made of synthetic resin. Made of float 32
Since the float 32 is not damaged, fragments of the float 32 will not be mixed into the brake oil, and the safety of the brake device will not be compromised at all.

FIG. 3 shows a modification of the rod in the present invention. In the steel rod 141 of this modification, the lower end is bent into a substantially annular shape and the bottomed cylindrical body 2
The arm 141a extends around the float 32, and the arm 141a is in planar contact with the upper surface of the float 32.

Note that the present invention is not limited to the above-mentioned embodiments, and the present invention is not limited to the above-mentioned embodiments. A variety of devices are operated by a magnet disposed on the inner periphery of an annular float that can be assembled to detect an insufficient amount of hydraulic oil contained in the reservoir body and activate a warning lamp or a warning buzzer. This can be implemented by appropriately modifying the oil level detection and warning device.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing an embodiment of the present invention;
2 is an enlarged perspective view of the lower part of the rod shown in FIG. 1, and FIG. 3 is an enlarged perspective view of the lower part of the rod showing a modification of the present invention. Explanation of symbols, 11... Reservoir body, 20...
Cap, 21... Cap body, 21a... Mounting hole provided in the cap body, 22... Bottomed cylindrical body,
22a...Mounting hole provided in the bottomed cylindrical body, 30...Oil amount detection warning device, 31...Reed switch, 32
...Float, 33...Magnet, 40...Check mechanism, 41,141...Rod, 42,1
41a...Arm.

Claims (1)

[Scope of utility model registration request] A reed switch is provided in the hanging bottomed cylinder of the cap that is fitted into the reservoir body, and this reed switch is arranged on the inner periphery of an annular float that is attached to the outer periphery of the bottomed cylinder so as to be movable in the vertical direction. In the oil level detection/warning device, the oil level detection/warning device is actuated by a magnet installed to detect a lack of oil level in the hydraulic oil housed in the reservoir body and activate a warning lamp or a warning buzzer. A mounting hole penetrating in the direction is provided, and an externally operable rod having a stopper in the middle portion that engages with the cap to restrict upward movement is assembled into this mounting hole so as to be movable up and down. is supported by being biased upward by a spring whose one end is fixed to the cap, and the lower end of the rod has an annular or semi-annular shape extending around the bottomed cylinder and abutting the upper surface of the float. A check mechanism for an oil level detection and warning device characterized by having an arm.