JP2545909Y2 - Hydraulic fluid reservoir - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic fluid reservoir connected to a brake master cylinder or the like of an automobile.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional hydraulic fluid reservoir.
And FIG. In the figure, reference numeral 1 denotes a master cylinder used for a brake system of an automobile, 2 denotes a hydraulic booster connected to the master cylinder 1, and the hydraulic booster 2 reduces the pedaling force of a brake pedal 3 and increases the pressure. A braking force can be generated. A hydraulic fluid reservoir 4 is provided so as to be mounted on the master cylinder 1. The hydraulic fluid reservoir 4 is horizontal when mounted on a vehicle.

The hydraulic fluid reservoir 4 is formed by integrally joining resin upper shells 4a and lower shells 4b obtained by molding by hot plate welding. A pair of partition walls 6a, 6b and 7a, 7b extending toward the other side are planted on the bottom or ceiling of the inner surface of the opening formed by the outer peripheral walls 5a, 5b of the upper shell 4a and the lower shell 4b. Upper shell 4a as described above.
And the lower shell 4b are butt-joined to form an inner partition 6
Two substantially rectangular hydraulic fluid chambers are defined by a, 6b and 7a, 7b. One of the hydraulic fluid chambers constitutes a fluid chamber 8 for the master cylinder which is communicated with the master cylinder 1, and the other hydraulic fluid chamber is a fluid chamber for the hydraulic booster which is communicated with the hydraulic booster 2. 9.

In this case, the liquid chamber 8 for the master cylinder is arranged on the master cylinder 1 and the liquid chamber 9 for the hydraulic booster is shifted in the direction perpendicular to the axial center 1c of the master cylinder 1. (Offset in the horizontal direction with respect to the master cylinder liquid chamber 8) and the entire device is substantially deformed L
It is shaped like a letter so that interference with devices such as an actuator (not shown) provided in the hydraulic booster 2 can be avoided.

[0005] Of the outer peripheral walls 5a and 5b, the outer peripheral walls 5am and 5bm that constitute the master cylinder liquid chamber 8 are formed with passage walls 10am and 10bm that substantially half circle the master cylinder liquid chamber 8. The end is connected orthogonally to the outer peripheral walls 5ae and 5be. Of the outer peripheral walls 5a and 5b, the outer peripheral walls 5ae and 5be which constitute the liquid chamber 9 for the hydraulic booster are formed with passage walls 10ae and 10be substantially half way around the liquid chamber 9 for the hydraulic booster. The ends are connected perpendicularly to the outer peripheral walls 5am and 5bm. Further, between the partition walls 6a and 7a of the upper shell 4a and the lower shell 4b.
Between the partition walls 6b and 7b, a ceiling surface portion 11 and a floor surface portion 12 facing each other are interposed so as to extend substantially in the horizontal direction.

The above-described passage walls 10am and 10bm and the outer peripheral wall 5a
m, 5bm, ceiling surface 11, floor surface 12, partitions 6a, 6b and partitions 7a, 7b, passage walls 10ae, 10be and outer peripheral walls 5ae, 5be
Thus, a passage 13 is formed. The slits 1 are formed in the outer peripheral walls 5a and 5b of the two liquid chambers 8 and 9 corresponding to the ends of the passage 13.
Liquid chambers 4 and 15 are formed, and both liquid chambers 8 and 9 are communicated through the passage 13 and both slits 14 and 15 so that fluctuations in the liquid levels of the liquid chambers do not directly affect each other.

The end faces of the passage walls 10am and 10bm, the passage wall 10
ae, 10be, the end faces of the peripheral walls 5am, 5bm where the passage walls 10am, 10bm are not formed, and the passage walls 10ae, 10b.
A welding margin 20a having a width H (about 3 to 5 mm) is provided on each of the end faces of the outer peripheral walls 5ae and 5be where no be is formed, that is, on the welded portions around the entire periphery of the upper shell 4a and the lower shell 4b.
, 20b are formed. By forming the welding ribs 16a and 16b over the entire circumference of the apparatus, a large value of peeling strength is ensured, and a uniform molten state is obtained by providing welding margins 20a and 20b of the same width on the entire circumference of the apparatus. Like that.

The hydraulic fluid reservoir 4 configured as described above
The hydraulic booster 2 causes the hydraulic booster 2 to increase the pedaling force applied to the brake pedal 3 by exchanging the hydraulic fluid with the hydraulic chamber 9 for the hydraulic booster, and the master cylinder 1 by exchanging the hydraulic fluid with the master cylinder 1. In addition, the pedaling force increased by the hydraulic booster 2 can be changed to hydraulic pressure.

[0009]

By the way, in the above-mentioned hydraulic fluid reservoir 4, as shown in FIG. 4, a passage wall is formed by heat shrinkage during molding or pressurization during injection of hydraulic fluid for product inspection. The master cylinder is bent so as to be bent at a corner 30 formed by orthogonal connection of 10am, 10bm and the outer peripheral walls 5ae, 5be, or at a corner 31 formed by orthogonal connection of the outer walls 5ae, 5be and the outer walls 5am, 5bm. If the thickness of the wall constituting the reservoir is not increased, the liquid chamber 8 or the liquid chamber 9 for the hydraulic pressure booster may be greatly deformed in the directions of arrows A and B.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a working fluid reservoir which can prevent the entire apparatus from being deformed by heat shrinkage during molding or pressurization during injection of working fluid. Aim.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, an object of the present invention is to provide a master cylinder liquid chamber and a booster which are formed by welding an upper shell and a lower shell which are obtained by molding and which communicate with each other. The liquid chamber for use is formed to be shifted in the direction perpendicular to the axis of the master cylinder, and is located at a corner formed by a substantially orthogonal wall in a substantially L-shaped hydraulic fluid reservoir,
A reinforcing portion having a welding allowance used for welding the upper shell and the lower shell is provided. In this case, in the welded portion of the upper shell and the lower shell, a welding allowance forming portion having a welding allowance of a predetermined width is provided in a portion other than the reinforcing portion, and the reinforcing portion has a welding allowance width of the reinforcing portion. A slit may be formed to have a width equal to the width of the welding margin of the welding margin forming portion.

[0012]

With such a configuration, the heat shrinkage during molding or the pressurization during injection of the hydraulic fluid causes a substantially fulcrum to be formed at the substantially corner portion on the liquid chamber side for the master cylinder or the liquid chamber side for the hydraulic pressure booster. Even when a force is applied, the reinforcing portion supports the force. Further, by providing a welding margin forming part having a welding margin of a predetermined width in a welding part other than the reinforcing part and forming a slit in the reinforcing part, a welding margin of the same width over the entire circumference is secured.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a working fluid reservoir 4 according to an embodiment of the present invention will be described.
Will be described based on FIG. 1 and FIG. 1 and 2 are located at corners 30 and 31 formed by mutually orthogonal walls, as compared with those shown in FIGS. 3 and 4,
The difference is that welding ribs 50a and 50b are provided as reinforcing portions having welding margins 40a and 40b used for welding the upper shell 4a and the lower shell 4b, and other parts and members are those shown in FIGS. 3 and 4. The description of the same parts and members will be omitted. In this case, slits 60 are formed in the welding ribs 50a and 50b.
a, 60b are formed, and the width of the welding margins 40a, 40b is reduced by the formation of the slits 60a, 60b.
The dimensions are the same as the width H of the welding margins 20a and 20b of 16b.

In the hydraulic fluid reservoir 4 shown in FIGS. 1 and 2, due to heat shrinkage during molding or pressurization during injection of the hydraulic fluid, etc., the fluid chamber 8 for the master cylinder or the fluid chamber 9 for the hydraulic booster is arranged. When the forces in the directions of arrows A and B are applied to the
50a and 50b will support the force, preventing the entire device from being deformed.

If the welding ribs 50a, 50b are provided on the entire surface as the welding margins 40a, 40b without forming the slits 60a, 60b, unevenness of welding occurs unless the welding work is troublesome, and the welding portion is formed on the entire periphery of the apparatus. However, in the present embodiment, the slit 60a
, 60b to form welding margins 20a, 2 of the same width over the entire circumference.
Since 0b, 40a, and 40b are secured, the welding operation can be easily performed, and the peel strength of the welded portion can be maintained at a large value without increasing the number of management steps.

As a measure for preventing deformation due to heat shrinkage or the like, it is conceivable to form the welding ribs 16a and 16b shown in FIG. 4 wider over the entire circumference, but in such a configuration, the upper shell 4a and the lower shell 4b are not provided. Requires a lot of material to get. In contrast, in the case of this embodiment, the deformation can be suppressed by providing the welding ribs 50a and 50b only at the corners 30 and 31, so that the amount of material used can be reduced accordingly.

[0017]

[Effects of the Invention] The present invention is a hydraulic fluid reservoir configured as described above. Therefore, heat shrinkage during molding or pressurization during injection of the hydraulic fluid causes the master cylinder liquid chamber side or hydraulic pressure doubling. Even when a force having a fulcrum as a fulcrum acts on the liquid chamber for the force device, the reinforcing portion supports the force, so that the entire device can be prevented from being deformed. In addition, a welding margin forming part having a welding margin of a predetermined width is provided in a welding part other than the reinforcing part, and a slit is formed in the reinforcing part, so that a welding margin of the same width over the entire circumference is secured, so that welding work is performed. The peel strength of the welded portion can be maintained at a large value without complicating the process.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a working fluid reservoir according to an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of the arrow Y in FIG.

FIG. 3 is a partial cross-sectional view showing an example of a conventional hydraulic fluid reservoir.

FIG. 4 is a schematic sectional view taken along line XX of FIG. 3;

[Explanation of symbols]

 1 Master cylinder 1c Axis 4 Hydraulic fluid reservoir 4a Upper shell 4b Lower shell 16a Upper shell welding rib (welding allowance forming part) 16b Lower shell welding rib (welding allowance forming part) 20a Upper shell welding allowance 20b Lower shell welding 30 corners 31 corners 20a Upper shell welding allowance 20b Lower shell welding allowance 40a Upper shell welding allowance 40b Lower shell welding allowance 50a Upper shell welding rib (reinforcing part) 50b Lower shell welding rib (reinforcing part) 60a Upper shell slit 60b Lower shell slit

Claims (2)

(57) [Scope of request for utility model registration] 1. A liquid chamber for a master cylinder and a liquid chamber for a booster which are welded to each other in an upper shell and a lower shell obtained by molding, and are shifted in a direction perpendicular to the axis of the master cylinder. In the substantially modified L-shaped hydraulic fluid reservoir formed in this way, it is located at a corner formed by substantially orthogonal walls,
A hydraulic fluid reservoir provided with a reinforcing portion having a welding allowance used for welding an upper shell and a lower shell. 2. A welding margin forming portion having a welding margin of a predetermined width is provided in a portion other than the reinforcing portion in the welding portion of the upper shell and the lower shell, and the reinforcing portion has a welding margin of the reinforcing portion. 2. The hydraulic fluid reservoir according to claim 1, wherein a slit is formed to have a width equal to a width of a welding margin of the welding margin forming portion.