JPH0624323A - Reservoir and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce the number of parts, and improve assembling property in a reservoir comprising a reservoir main body of synthetic resin at which a base end of a guide cylinder for guiding elevation of a float is provided by providing a stopper to regulate motion limit of the float integrally at the reser voir main body. CONSTITUTION:A reservoir main body is composed of a lower half body 7 and an upper half body to be welded to each other, a guide cylinder 15 with which a float 6 is engaged to elevate freely is moulded integrally with the lower half body 7, and a cylindrical stopper 25 to regulate up motion limit of the float 6 is integraly moulded with the upper half body 8 to be engaged with a forward end outer circumference of this guide cylinder 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention guides a reservoir for storing hydraulic oil of hydraulically operated equipment such as a master cylinder, and more particularly, to a synthetic resin reservoir body for ascending and descending a float accommodated in the reservoir body. The present invention relates to a reservoir in which a base end of a guide cylinder is integrally connected, and a stopper for restricting a movement limit of a float toward the tip end is disposed at a tip end portion of the guide cylinder, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Such a reservoir is disclosed in, for example, Japanese Patent Laid-Open No.
It is already known as disclosed in Japanese Patent No. 106884.

[0003]

Conventionally, in such a reservoir, in order to regulate the movement limit of the float on the guide cylinder, a stopper ring serving as a stopper is attached to the tip end of the guide cylinder. The number of parts is large, and the work of attaching the locking ring is troublesome, which hinders the improvement of the assembly work efficiency.

The present invention has been made in view of such circumstances, and the above-mentioned reservoir and its reservoir which can easily perform the movement limit of the float on the guide cylinder without using a dedicated part. The purpose is to provide a manufacturing method.

[0005]

To achieve the above object, the present invention comprises a reservoir body composed of a lower half body and an upper half body which are joined to each other, and one of the lower half body and the upper half body is provided with the reservoir body. The first feature is that the guide cylinder is integrally formed, and the other end thereof is integrally formed with a cylindrical stopper that is fitted to the outer periphery of the front end portion of the guide cylinder to restrict the movement limit of the float at the tip. To do.

Further, according to the present invention, a reservoir main body is composed of a lower half body and an upper half body which are joined to each other, and one of the lower half body and the upper half body is integrally formed with a guide cylinder for guiding the lifting and lowering of the float. On the other hand, on the other hand, there is a method of manufacturing a reservoir integrally formed with a cylindrical stopper fitted to the outer circumference of the tip end of the guide cylinder so as to regulate the movement limit of the float at the tip. Insert a heating plate with a clearance that avoids interference with the guide tube or stopper tip between the joining surfaces of the halves, and press both joining surfaces against the front and back surfaces of this heating plate to form a welding surface. The second feature is that the welding surfaces are pressed against each other for welding.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional side view of the reservoir, and FIG. 2 is FIG.
2 is a sectional view taken along line 2-2 of FIG. In these drawings, the reservoir is attached to a tandem type master cylinder of a vehicle brake device, and a float 6 that moves up and down according to the level of hydraulic oil stored therein is provided in a synthetic resin reservoir body 5. It is configured to be stored.

The reservoir main body 5 is formed by welding a bottomed cylindrical lower half body 7 having an open top and an upper half body 8 having a lower opening corresponding to the upper opening of the lower half 7 to each other. Consists of That is, in the upper opening portion of the lower half body 7 and the lower opening portion of the upper half body 8, the flange 7 protruding outwardly is provided.
a and 8a are respectively formed, and these flanges 7a and 8a are formed.
The facing surfaces of a become welding surfaces 7b and 8b and are welded to each other.

The reservoir body 5 has an oil reservoir chamber 9 for storing hydraulic oil therein, and an oil supply cylinder 10 for injecting hydraulic oil into the chamber 9 extends obliquely upward and an upper half body 8 is provided. It is provided in. The inlet of the fuel supply cylinder 10 is normally closed with a cap 11.

On the bottom wall of the lower half body 7, the lower part of the oil sump chamber 9 is
A pair of oil reservoirs 12₁, 12₂Partition wall 13 is divided into
Is formed on one side, and one of the oil reservoirs 12 is formed.₁Connection tube connected to
14 ₁And the other oil reservoir 12₂Connection tube 14 connected to₂When
Are integrally provided on the bottom surface of the lower half body 7. Also the lower half 7
On the outer surface of the upper side of the oil reservoir 9
Rib-shaped level mark 7c for indicating each limit level
And 7d are provided so as to project over substantially the entire circumference.

[0012] bottom wall of the oil reservoir 12 ₂ side of the lower half 7,
The base end of the guide cylinder 15 which opens at both upper and lower ends and extends vertically,
That is, the lower end is integrally connected. The bottom wall of the lower half body 7 has one side wall and the guide cylinder 15, and the guide cylinder 15 and the partition wall 1.
Ribs 16 and 17 for connecting the respective parts 3 are formed integrally with each other at the same level as the partition wall 13.

The center hole 18 of the float 6 is loosely engaged with the guide tube 15 so that the lifting operation is guided by the guide tube 15. An annular permanent magnet 19 surrounding the guide cylinder 15 is embedded in the inner peripheral surface of the center hole 18.

In the middle portion of the guide cylinder 15 near the upper end,
A partition wall 20 that divides the inside of the guide cylinder 15 into an upper part and a lower part is integrally formed. The partition wall 20 and the guide cylinder 1
The reed switch 22 and its protective resistance 23 are housed in the guide cylinder 15 between the reed switch 22 and the stopper 21 fitted in the lower opening of the guide 5.

These reed switch 22 and protection resistor 2
The lead wire 24 connected to 3 is fixed by the plug body 21 to hold the reed switch 22 at a predetermined level.

An oil drain groove 27 for preventing hydraulic oil from collecting on the partition wall 20 is provided on the upper peripheral wall of the guide cylinder 15.

On the other hand, on the upper wall of the upper half body 8, the float 6
The cylindrical stopper 25 that regulates the upper limit of the movement is integrally formed. The stopper 25 has an inner diameter slightly larger than the outer diameter of the guide cylinder 15, and is fitted to the outer periphery of the tip end of the guide cylinder 15. Thus, the rising limit of the float 6 regulated by the stopper 25 is that the float 6 is submerged in the hydraulic oil when the level of the hydraulic oil in the oil reservoir 9 is at or near the upper limit level mark 7c. Is set to exist.

Therefore, since the float 6 is submerged in the hydraulic oil at normal times, the float 6 is also caused by the waviness of the oil surface.
You can prevent the jump. Then, when the hydraulic oil decreases below the intermediate level between the upper and lower limit level marks 7c and 7d, the float 6 floats up to follow the oil level, and when the hydraulic oil further decreases below the lower limit level mark 7d, the float 6 6 is received by the ribs 16 and 17, and the magnetic force of the magnet 19 keeps closing the reed switch 22. When the reed switch 22 is closed, an alarm device (not shown) is activated to warn the operator of the decrease in hydraulic oil.

FIG. 3 shows a method of manufacturing the above reservoir. In the production, first, the upper and lower halves 8 and 7 are individually injection-molded. At that time, each half 7,
The peripheral wall height of 8 is set in consideration of the reductions L ₁ and L ₂ due to the heat forming of the flanges 7a and 8a.

Next, the float 6 is fitted into the guide cylinder 15 of the lower half body 7, and then the facing surfaces of the upper and lower half bodies 8 and 7 are pressed against the front and back surfaces of the heating plate 28, whereby the welding surface 7b. ，
Form flanges 7a, 8a having 8b.

In this case, the heating plate 28 used is provided with a recess 29 such as a recess or a hole at a portion corresponding to the stopper 25 or the guide tube 15, and the escape 29 causes the stopper 25 or the guide tube 15 to escape. Melt damage due to the heating plate 28 can be prevented.

After forming the flanges 7a and 8a, both halves 7,
8 is removed from the heating plate 28, and the stopper 25 is attached to the guide tube 15
And the welding surfaces 7b, 8b of the flanges 7a, 8a are pressed against each other and welded. At this time, the stopper 25 and the guide cylinder 15 are fitted to each other, so that the positioning of the two halves 7, 8 at the time of welding can be performed easily and accurately. Furthermore, the stopper 25 can support the tip of the guide cylinder 15 and prevent the guide cylinder 15 from falling.

In the present invention, various design changes can be made without departing from the spirit of the invention. For example, the guide cylinder 15 is provided in the upper half body 8, and the stopper 25 is provided in the lower half body 7.
It is also possible to integrally form each of them and to limit the descending limit of the float 6 by the stopper thereof.

[0024]

As described above, according to the first aspect of the present invention, the reservoir body is composed of the lower half body and the upper half body that are joined to each other, and the reservoir body is guided to one of the lower half body and the upper half body. The cylinders were integrally molded, and the other end of them was integrally molded with a cylindrical stopper that fits on the outer periphery of the tip of the guide cylinder in order to regulate the movement limit of the float at the tip. In this case, it becomes possible to immediately regulate the movement limit of the float, and neither a dedicated component for the regulation nor an attaching work is required, so that the number of components can be reduced and the assemblability can be improved. Moreover, when the two halves are joined together, the guide cylinder and the stopper are fitted to position the two halves relative to each other.
Not only the joining can be performed easily and accurately, but also the guide cylinder can be reinforced by the stopper to prevent the guide cylinder from falling.

According to the second feature of the present invention, the lower half body and the upper half body are provided with a heating plate having a clearance for avoiding interference with the guide tube or the stopper tip between the joining surfaces thereof, Since both welding surfaces are pressed against both the front and back sides of this heating plate to form a welding surface and these welding surfaces are pressed against each other to weld, the heating plates are used to obtain the welding surfaces when welding both halves. However, it is possible to prevent the heating plate from interfering with the guide tube or the stopper, and prevent their melting damage.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a reservoir according to an embodiment of the present invention.

2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a vertical cross-sectional side view of essential parts showing a method for manufacturing a reservoir of the present invention.

[Explanation of symbols]

 5 Reservoir body 6 Float 7 Lower half body 8 Upper half body 7a, 8a Flange 7b, 8b Welding surface 25 Stopper 28 Heating plate 29 Escape

Claims (2)

[Claims] 1. A base end of a guide cylinder (15) for guiding up and down of a float (6) housed in the reservoir body (5) is integrally connected to a reservoir body (5) made of synthetic resin. ,
In a reservoir provided with a stopper (25) for restricting a movement limit of the float (6) to the tip end side of the guide cylinder (15), a lower half body (7) and a lower half body (7) joined to each other are provided. The upper half body (8) constitutes the reservoir body (5), and the guide cylinder (15) is integrally formed on one of the lower half body (7) and the upper half body (8), and on the other side, A reservoir characterized in that a tubular stopper (25) fitted to the outer periphery of the tip end portion of a guide tube (15) is integrally molded so as to limit the movement limit of the float (6) at the tip. 2. A reservoir body (5) comprising a lower half (7) and an upper half (8) joined together, one of the lower half (7) and the upper half (8) being A guide tube (15) for guiding the up and down movement of the float (6) is integrally formed, and the other end of the guide tube (15) is fitted to the outer circumference of the tip end of the guide tube (15) so as to restrict the movement limit of the float (6) at the tip. A method of manufacturing a reservoir in which a mating tubular stopper (25) is integrally molded, wherein a lower half body (7) and an upper half body (8) are inserted between their joint surfaces to form a guide cylinder (15) or A heating plate (28) having a clearance (29) for avoiding interference with the tip of the stopper (25) is inserted, and both bonding surfaces are pressed against both front and back surfaces of this heating plate (28) to form a welding surface (7b, 8b). And these welding surfaces (7b, 8b) are pressed against each other for welding. Fabrication method of observers.