JP3774079B2 - Hydraulic pressure generator for automobile brakes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic pressure generator that operates a brake or clutch of an automobile with hydraulic pressure. More specifically, the hydraulic pressure generator has a booster that increases pedal effort and an input load increased by the booster. A tandem type hydraulic master cylinder that converts to a hydraulic pressure cylinder, and a reservoir that stores hydraulic fluid at the upper part of the hydraulic master cylinder. The present invention relates to a structure of a hydraulic pressure generating device that avoids an influence on a passenger compartment as much as possible when receiving an external force.
[0002]
[Prior art]
An example of a hydraulic pressure generator used for hydraulically operating a brake of an automobile is disclosed in, for example, Japanese Patent Laid-Open No. 9-39783.
[0003]
This hydraulic pressure generator includes a booster projecting toward the front of the vehicle body on the side of the engine compartment of the dash panel that partitions the engine compartment and the passenger compartment at the front of the vehicle body, and the booster shell front side of the booster Two actuators with a two-line tandem hydraulic master cylinder that connects the cylinder body in the longitudinal direction of the vehicle body, and is made of a synthetic resin that is assembled integrally to the upper part of the cylinder body of the hydraulic master cylinder. The hydraulic fluid stored in the reservoir can be supplied to the hydraulic master cylinder at any time.
[0004]
The hydraulic master cylinder and the reservoir include a first hydraulic fluid introduction boss portion and a second hydraulic fluid introduction boss portion that protrude from the upper surface of the cylinder body, and a first hydraulic fluid supply boss portion and a second operation that protrude from the lower surface of the reservoir. The liquid supply boss part is assembled by fitting inside and outside liquid tightly via a grommet seal, and a reservoir connecting arm protruding from the cylinder body and a cylinder body connecting arm protruding from the reservoir between these two sets of boss parts Are overlapped in the vehicle body width direction, and both connecting arms are fastened with connecting bolts to be integrally connected.
[0005]
The hydraulic pressure generator configured in this way is arranged on the rear side of the engine compartment with the axis of the booster shell and cylinder body parallel to the longitudinal direction line of the vehicle body or the front end side of the cylinder body tilted upward in the vehicle body. The engine and other auxiliary devices are generally arranged at a height lower than that of the hydraulic pressure generator.
[0006]
[Problems to be solved by the invention]
In such a configuration, when an excessive external force is applied to the engine compartment from the front of the vehicle body, such as a collision of the front of the vehicle body, the external force may reach the hydraulic pressure generator through the engine and auxiliary devices. is there. Since the engine and auxiliary equipment on the front side of the vehicle body relative to the hydraulic pressure generating device are at a lower position than the hydraulic pressure generating device as described above, the external force transmitted to the engine and auxiliary equipment is the cylinder of the hydraulic master cylinder. The body acts to push up the vehicle body, and the reservoir at the upper part of the cylinder body comes into contact with the booster shell vehicle body front portion of the booster.
[0007]
This tilt of the cylinder body diverts the external force from the front of the vehicle body, making it difficult to act as a push-back force on the push rod and brake pedal that follow in the booster and passenger compartment. Although it is beneficial to incline, the above-mentioned reservoir is made of lightweight synthetic resin, but is formed with a suitable thickness to give a certain degree of strength, and a large number of ribs are provided inside the storage tank. Therefore, even if the reservoir comes into contact with the booster shell, the degree of damage of the reservoir is low, and the tilt of the cylinder body is hindered.
[0008]
The present invention has been made in the background of such a situation, and the object of the present invention is to push the passenger compartment when an external force from the front of the vehicle body acts on the hydraulic pressure generating device in the upward direction of the vehicle body. An object of the present invention is to provide a brake hydraulic pressure generator for an automobile that can prevent rods and pedals from being pushed back to the driver side as much as possible.
[0009]
[Means for Solving the Problems]
In accordance with the above-described object, the present invention provides a tandem hydraulic master cylinder connected to a front side of a vehicle body of a booster disposed in an engine room with a cylinder body facing in the longitudinal direction of the vehicle body. A brake hydraulic pressure generator for an automobile having a synthetic resin reservoir at an upper portion thereof, the first hydraulic fluid introduction boss portion and the second hydraulic fluid introduction boss portion projecting from the upper surface of the cylinder body, and the lower surface of the reservoir The first hydraulic fluid supply boss portion and the second hydraulic fluid supply boss portion that protrude to the inner side and the second hydraulic fluid supply boss portion are fitted inside and outside liquid tightly, and the reservoir connecting arm and the reservoir that protrude from the cylinder body between these two boss portions The cylinder body connecting arm protruding from the vehicle body is overlapped in the vehicle body width direction, and a connecting bolt is inserted into a bolt mounting hole drilled in the vehicle body width direction in both connecting arms, In a brake hydraulic pressure generator for an automobile that connects to a server, a slit is formed in the cylinder body connecting arm of the reservoir from the bolt mounting hole to an outer edge of the cylinder body connecting arm, and the slit is formed from the bolt mounting hole. The reservoir is disposed toward the rear side of the vehicle body, and when the cylinder body is tilted in the upward direction of the vehicle body due to an external force acting on the cylinder body, the reservoir is placed on the vehicle body front side of the booster. By contacting, the connecting bolt is pulled out to the outside of the cylinder body connecting arm through the slit, so that the cylinder body and the reservoir can be separated.
[0010]
Also, a first protrusion is provided on the rear side of the reservoir on the vehicle body side, and the first protrusion is provided on the vehicle body front side of the booster when the reservoir is tilted upward along with the cylinder body by an external force from the vehicle body front direction. A second protrusion can be provided that enters the lower side of the part and pushes up the first protrusion upward in the vehicle body to assist separation of the cylinder body and the reservoir. Further, a wall plate thinner than the cylinder body connecting arm can be provided in the slit of the cylinder body connecting arm to close the slit.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 to 4 show a first embodiment of the present invention, FIG. 1 is an enlarged view of a main part of FIG. 2 showing a connection state between a cylinder body and a reservoir, and FIG. 2 is a brake hydraulic pressure generation of an automobile. 3 is a sectional front view of the apparatus, FIG. 3 is a sectional view taken along line III-III in FIG. 1, and FIG. 4 is an exploded perspective view of a cylinder body, a reservoir, and a connecting bolt. FIG. 5 is a cross-sectional view of the cylinder body and the reservoir connected to each other showing the second embodiment of the present invention. 6 and 7 show a third embodiment of the present invention, FIG. 6 is a front view of a main part of a brake hydraulic pressure generator for an automobile, and FIG. 7 is a sectional view taken along line VII-VII in FIG.
[0013]
In the first embodiment shown in FIGS. 1 to 4, the engine compartment 1 on the vehicle body front side (left side in FIGS. 1 and 2) and the passenger compartment 2 following the vehicle body rear side of the engine compartment 1 are: The engine compartment 1 is partitioned by a dash panel 3, and a hydraulic pressure generator 6 having two hydraulic pressure generating actuators, a booster 4 and a hydraulic master cylinder 5, is provided in the engine compartment 1 on the side of the engine compartment of the dash panel 3. Projected.
[0014]
In the passenger compartment 2, a valve housing 4 b of the booster 4, a push rod 7, and a brake pedal 8 are disposed. The booster 4 increases the pedaling force input to the brake pedal 8 as an input load of the hydraulic pressure generator 6. The input load is converted into a hydraulic pressure by the hydraulic master cylinder 5 and supplied to a brake (not shown).
[0015]
The dash panel 3 faces the vehicle body front-rear direction (the left-right direction in FIGS. 1 and 2) and is disposed slightly tilted rearward on the passenger compartment 2 side. The booster 4 includes a large-diameter booster shell 4a disposed in the engine compartment 1 and the above-described valve housing 4b that penetrates the dash panel 3 and protrudes into the passenger compartment 2. The booster shell 4a is The booster 4 protrudes toward the front of the vehicle body by overlapping the dash panel 3 on the side of the engine compartment and fastening them with bolts 9 and nuts 10.
[0016]
The hydraulic master cylinder 5 is a two-system tandem type in which two pistons and two hydraulic chambers (both not shown) are alternately arranged in a cylinder hole inside the cylinder body 5a. A reservoir 11 is connected to the upper side of the body 5a. A large-diameter cylindrical first hydraulic fluid introduction boss portion 5b and a second hydraulic fluid introduction boss portion 5c communicating with the inside of the cylinder hole protrude from the front and rear portions of the upper surface of the cylinder body 5a. A plate-like reservoir connecting arm 5d protrudes between 5b and 5c, and a female screw hole is drilled as a bolt mounting hole 5f in the reservoir connecting arm 5d, and further on the rear end side of the cylinder body 5a. A connecting flange 5e is projected.
[0017]
The reservoir 11 includes a reservoir body 12 that stores hydraulic fluid, and a reservoir cap 13 that seals the upper surface opening of the reservoir body 12. The reservoir body 12 and the reservoir cap 13 are each integrally formed of synthetic resin by press molding or the like. Among these, the reservoir body 12 has a corresponding thickness and is provided with a plurality of ribs inside. The overall strength is increased. A first hydraulic fluid supply boss portion 12a and a second hydraulic fluid supply boss portion 12b having a small diameter cylindrical shape project from the lower surface of the reservoir body 12, and a plate-like shape is provided between the hydraulic fluid supply boss portions 12a and 12b. The cylinder body connecting arm 12c is projected, and the cylinder body connecting arm 12c is provided with a bolt mounting hole 12d and a slit 12e.
[0018]
The bolt mounting hole 12d is formed in the approximate center of the cylinder body connecting arm 12c with a diameter capable of accommodating a large-diameter shaft portion 15a of the connecting bolt 15 described later, and the slit 12e is formed with the bolt mounting hole 12d and the connecting bolt 15 It is slightly narrower than the large-diameter shaft portion 15a, and is inclined so as to be away from the lower surface of the reservoir body 12 from the bolt mounting hole 12d toward the second hydraulic fluid supply boss portion 12b.
[0019]
The first working fluid supply boss portion 12a of the reservoir 11 is the first working fluid introduction boss portion 5b of the cylinder body 5a, and the second working fluid supply boss portion 12b of the reservoir 11 is the second working fluid introduction boss portion of the cylinder body 5a. 5c and the grommet seal 14 are respectively fitted inside and outside liquid tightly, and the cylinder hole of the cylinder body 5a and the inside of the reservoir body 12 of the reservoir 11 communicate with each other through these two sets of fitting bosses. Further, between the two sets of fitting bosses described above, the reservoir connecting arm 5d and the cylinder body connecting arm 12c protruding from the cylinder body 5a and the reservoir body 12 are overlapped in the vehicle body width direction, and both connecting arms The bolt mounting holes 5f and 12d of 5d and 12c are opened in the vehicle body width direction, the large diameter shaft portion 15a of the connecting bolt 15 is inserted into the bolt mounting hole 12d of the cylinder body connecting arm 12c, and the small diameter of the connecting bolt 15 is inserted. The male screw 15b is screwed into the bolt mounting hole 5f of the reservoir connecting arm 5d, and the cylinder body 5a and the reservoir 11 are integrally connected.
[0020]
The hydraulic master cylinder 5 is configured such that the connecting flange 5e on the rear end side of the cylinder body 5a is overlapped with the front surface of the booster shell 4a, and the connecting flange 5e and the booster shell 4a are fastened with bolts 16 and nuts 17, The booster 4 is connected in series to the front portion. A hydraulic pressure generating device 6 in which the booster 4 and the hydraulic pressure master cylinder 5 are connected to each other by inserting the valve housing 4b of the booster 4 from the engine chamber 1 side into the insertion hole 3a of the dash panel 3, and the rear surface of the booster shell 4a being dashed. The connecting bolt 9 which is brought into contact with the side of the engine chamber of the panel 3 and protruded from the back surface of the booster shell 4a is projected into the passenger compartment 2 through the bolt hole 3b of the dash panel 3, and the connecting bolt 9 The nut 10 is screwed and protruded from the side of the engine compartment of the dash panel 3.
[0021]
From the inclined arrangement of the dash panel 3, the hydraulic pressure generator 6 attached in this way is connected to the rear end of the vehicle body in the engine compartment 1 with the common central axis CL1 of the booster 4 and the cylinder body 5a from the vehicle longitudinal direction line L1. The vehicle is tilted upward by an angle θ (solid line state in FIG. 2), and an engine and other auxiliary devices (not shown) are arranged at a lower height than the hydraulic pressure generator 6 on the front side of the vehicle body. ing. In addition, a slit 12e formed in the cylinder body connecting arm 12c of the reservoir body 12 extends from the axis L2 passing through the center of the bolt mounting hole 12d parallel to the center axis CL2 of the boss portions 5b, 5c, 12a, 12b to the vehicle body rear side. Is arranged.
[0022]
The present embodiment is configured as described above, and the hydraulic pressure generating device 6 protruding from the dash panel 3 on the engine chamber side includes the reservoir connecting arm 5d of the cylinder body 5a and the cylinder body connecting arm of the reservoir body 12. The cylinder body 5a and the reservoir 11 are well connected by screwing 12c with the connecting bolt 15.
Further, when an excessive external force acts on the front part of the vehicle body such as a collision of the front part of the vehicle body, the external force passes through the engine or other auxiliary equipment and is located on the vehicle body front side of the hydraulic pressure generator 6. It acts upward on the tip side of the pressure master cylinder 5. The hydraulic pressure generator 6 is located slightly above the engine and auxiliary equipment as described above, and further, the booster 4 and the central axis CL1 of the cylinder body 5a are inclined by an angle θ from the vehicle longitudinal direction line L1 upward to the vehicle body. Therefore, the external force from the engine and auxiliary equipment acts on the hydraulic master cylinder 5 from the central axis CL2 toward the vehicle body upward, and the connecting portion between the connecting flange 5e of the cylinder body 5a and the booster shell 4a. Is broken, the cylinder body 5a and the reservoir 11 are tilted upward as shown by an arrow A, and the rear side of the reservoir 11 comes into contact with the front surface of the booster shell 4a (imaginary line state in FIG. 2).
[0023]
Since the reservoir 11 is reinforced by its thickness and ribs as described above, the contact with the booster shell 4a is less damaged, and the booster shell 4a and the booster shell 4a are subjected to the load in the direction of arrow A continuously acting from the cylinder body 5a. A reaction force in the direction of arrow B substantially along the inclination of the slit 12e of the cylinder body connecting arm 12c is generated with the contact point of the cylinder body connecting arm 12c as a fulcrum, and the connecting bolt 15 inserted through the bolt mounting hole 12d of the cylinder body connecting arm 12c is large. The radial shaft portion 15a comes out of the cylinder body connecting arm 12c while expanding the narrow slit 12e.
[0024]
As a result, the connection state between the cylinder body 5a of the hydraulic master cylinder 5 and the reservoir body 12 of the reservoir 11 is released, and a load in the direction of arrow A acts from the cylinder body 5a to the reservoir 11 to supply the first hydraulic fluid. The fitting between the boss portion 12a and the first hydraulic fluid introduction boss portion 5b and the second hydraulic fluid supply boss portion 12b and the second hydraulic fluid introduction boss portion 5c is disengaged, and the reservoir 11 is dropped from the cylinder body 5a. The entire cylinder body 5a, which has lost its resistance due to the drop-off of the reservoir 11, easily tilts in the direction of arrow A.
[0025]
Such inclination of the cylinder body 5a acts on the subsequent booster shell 4a as an offset load deviating from the center axis CL1 in the vehicle body upward direction, and the booster shell 4a has a vicinity of the attachment portion to the dash panel 3 as a fulcrum. A rotational moment is applied so that the valve housing 4b and the brake pedal 8 in the passenger compartment 2 connected to the booster shell 4a are retracted in the vehicle body downward direction of the dash panel 3, so that the push-back to the driver side can be avoided well. Can do.
[0026]
Further, most of the external force from the front direction of the vehicle body acts on the cylinder body 5a from the lower side of the vehicle body longitudinal direction line L1 from the lower side of the vehicle body front-rear direction line L1 from the layout of the engine and auxiliary devices described above. Furthermore, even if an external force from the front direction of the vehicle body acts in the range of the angle θ from the vehicle front-rear direction line L1 to the vehicle body upward direction, this can be dealt with.
[0027]
The shape and orientation of the slit 12e of the cylinder body connecting arm 12c can be freely set according to various design conditions of the hydraulic pressure generating device 6, attachment to the vehicle body, or how external force is applied from the front of the vehicle body. Is possible. For example, in the second embodiment shown in FIG. 5, the slit 12e has the same diameter as that of the bolt mounting hole 12d, and the reservoir main body is directed from the bolt mounting hole 12d to the second hydraulic fluid supply boss part side (right side in FIG. 5). 12 is arranged substantially parallel to the lower surface of 12.
[0028]
In the present embodiment, a semicircular arc-shaped tongue piece of the cylinder body connecting arm 12c that wraps around the cylinder body side from the slit 12e during normal times when no external force from the front of the vehicle body acts (in FIG. 5, the large diameter shaft of the connecting bolt 15). The lower side of the part 15a) prevents the connecting bolt 15 from coming off, maintains the connected state between the cylinder body 5a and the reservoir body 12, and when an excessive external force acts from the front of the vehicle body, The large-diameter shaft portion 15a deforms the tongue piece of the cylinder body connecting arm 12c or exits the slit 12e substantially in parallel, and the connection state between the cylinder body 5a and the reservoir body 12 is released.
[0029]
In the third embodiment shown in FIGS. 6 and 7, a wall plate 12f that is thinner than the plate thickness of the cylinder body connecting arm 12c is provided on substantially the entire length of the slit 12e of the cylinder body connecting arm 12c. When the connecting bolt 15 is further prevented from coming off and when an external force from the front of the vehicle body acts through the cylinder body 5a, the large-diameter shaft portion 15a of the connecting bolt 15 breaks out of the wall plate 12f and exits the slit 12e. I have to.
[0030]
Further, in the present embodiment, the rear body side of the flange provided around the reservoir body 12 is the first protrusion 12g of the present invention, and the L-shaped second protrusion 20 is provided on the front body side of the booster shell 4a. When the reservoir 11 is tilted upward along with the cylinder body 5a by the external force from the front of the vehicle body, the tip end of the second protrusion 20 enters the lower side of the first protrusion 12g and the first protrusion By pushing the portion 12g upward in the vehicle body, the cylinder body 5a and the reservoir 11 are separated from each other.
[0031]
In the present invention, even when the hydraulic pressure generating device is mounted parallel to the longitudinal direction line of the vehicle body, the external force from the vehicle body front direction acts on the cylinder body of the hydraulic master cylinder from below. The purpose of the period can be achieved. Each bolt mounting hole of the reservoir connecting arm and the cylinder body connecting arm, the slit of the cylinder body connecting arm and the connecting bolt, and the first and second protrusions of the reservoir and the booster may have different shapes from the above-described embodiments. Good. For example, the connecting bolt may be simply inserted through the bolt mounting holes of the reservoir connecting arm and the cylinder body connecting arm, and the connecting bolt may be stopped with a separate nut.
[0032]
【The invention's effect】
As described above, according to the present invention, the connecting bolt between the reservoir connecting arm of the cylinder body and the cylinder body connecting arm of the reservoir is connected to the cylinder body connecting arm when the hydraulic pressure generating device is not attached to the vehicle body. The cylinder body and the reservoir are well connected, and when an excessive external force is applied from the front of the vehicle body, the connecting bolt comes out of the slit of the cylinder body connecting arm, and the cylinder body and the reservoir body By releasing the connection, the hydraulic master cylinder can be easily tilted from the longitudinal direction of the vehicle body to the upward direction of the vehicle body, and the external force from the front direction of the vehicle body is diverted, so the valve housing, push rod, brake pedal in the passenger compartment It is possible to favorably avoid being pushed back to the driver side. Furthermore, as compared with the hydraulic pressure generating device of the conventional structure, it is only necessary to form a slit in the cylinder body connecting arm of the reservoir, and since the structure is simple and there is no increase in the number of parts, it can be carried out at a low cost. Moreover, the existing vehicle body structure can be applied as it is without any change.
[0033]
Also, the first protrusion is provided on the rear side of the vehicle body of the reservoir, and the second protrusion is provided on the front side of the booster. When an external force is applied from the front direction of the vehicle body, Since the two protrusions are brought into contact to assist the separation of the cylinder body and the reservoir, the booster valve housing, push rod, and brake pedal can be more reliably prevented from being pushed back to the driver side. become.
[0034]
In addition, the cylinder body connection is provided on the slit of the arm, and the wall plate thinner than the cylinder body connection arm is provided, so that the thin wall plate in the slit normally prevents the connecting bolt from being applied by external force from the front of the vehicle body. It can be surely retained.
[Brief description of the drawings]
FIG. 1 is an enlarged view of a main part of FIG. 1 showing a connection state between a cylinder body and a reservoir according to a first embodiment of the present invention. FIG. 2 shows generation of brake hydraulic pressure for an automobile according to the first embodiment of the present invention. Fig. 3 is a cross-sectional front view of the apparatus. Fig. 3 is a cross-sectional view taken along the line III-III of Fig. 1 showing a first embodiment of the invention. Fig. 4 is an exploded perspective view of a cylinder body, a reservoir, and a connecting bolt. FIG. 5 is a cross-sectional view of a cylinder body and a reservoir connected to each other according to a second embodiment of the present invention. FIG. FIG. 7 is a sectional view taken along line VII-VII in FIG. 6 showing a third embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Engine compartment 2 ... Passenger compartment 3 ... Dash panel 4 ... Booster 4a ... Booster shell 4b ... Valve housing 5 ... Hydraulic master cylinder 5a ... Cylinder body 5b ... 1st hydraulic fluid introduction boss | hub part 5c ... 2nd hydraulic fluid introduction boss | hub 5d ... reservoir connecting arm 5e ... connecting flange 5f ... bolt mounting hole 6 ... hydraulic pressure generating device 7 ... push rod 8 ... brake pedal 11 ... reservoir 12 ... reservoir body 12a ... first hydraulic fluid supply boss 12b ... second operation Liquid supply boss 12c ... Cylinder body connecting arm 12d ... Bolt mounting hole 12e ... Slit 12f ... Wall plate 12g thinner than plate thickness of cylinder body connecting arm 12c ... First protrusion 13 ... Reservoir cap 14 ... Grommet seal 15 ... Connecting bolt 15a ... large diameter shaft 15b ... male screw 20 ... second projection CL1 ... booster 4 and cylinder body 5a common central axis CL2 ... central axis L1 of the bosses 5b, 5c, 12a, 12b ... vehicle body longitudinal direction line L2 ... axis passing through the center of the bolt mounting hole 12d ... vehicle body longitudinal direction line L1 of the hydraulic pressure generator 6 Angle A from the cylinder body 5a and the inclination direction B of the reservoir 12 B ... the reaction force direction of the reservoir 12

Claims (3)

A tandem hydraulic master cylinder is connected to the front side of the vehicle body of the booster disposed inside the engine room with the cylinder body facing the vehicle body in the longitudinal direction of the vehicle body, and a synthetic resin reservoir is provided on the cylinder body. A brake hydraulic pressure generator for an automobile, the first hydraulic fluid introduction boss and the second hydraulic fluid introduction boss projecting from the upper surface of the cylinder body, and the first hydraulic fluid supply boss projecting from the lower surface of the reservoir And the second hydraulic fluid supply boss are fitted in a fluid-tight manner inside and outside, and a reservoir connecting arm protruding from the cylinder body and a cylinder body connecting arm protruding from the reservoir are connected between the two sets of bosses. An automobile block that connects the cylinder body and the reservoir by superimposing them in the vehicle body width direction and inserting the connection bolts into the bolt mounting holes drilled in the vehicle body width direction in both connection arms. In the engine hydraulic pressure generating device, a slit is formed in the cylinder body connecting arm of the reservoir from the bolt mounting hole to the outer edge of the cylinder body connecting arm, and the slit is directed from the bolt mounting hole toward the rear side of the vehicle body. When the external force from the vehicle body front direction acts on the cylinder body and the cylinder body is tilted upward, the reservoir contacts the vehicle body front side of the booster. A brake hydraulic pressure generator for an automobile, wherein a connecting bolt is pulled out of the cylinder body connecting arm through the slit to separate the cylinder body and the reservoir. A first protrusion is provided on the rear side of the vehicle body of the reservoir, and on the front side of the booster, when the reservoir is tilted upward along with the cylinder body by the external force from the front side of the vehicle body, 2. The second protrusion for assisting the separation of the cylinder body and the reservoir by entering the lower side of the one protrusion and pushing the first protrusion upward in the vehicle body is provided. Fluid pressure generator for automobile brakes. The brake hydraulic pressure generator for an automobile according to claim 1 or 2, wherein a wall plate thinner than the cylinder body connecting arm is provided in the slit.

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