JP6587868B2 - Hydraulic fluid reservoir tank for vehicle hydraulic device, hydraulic brake device for vehicle, and method for manufacturing hydraulic fluid reservoir tank for vehicle hydraulic device - Google Patents

Description

  The present invention relates to a hydraulic fluid reservoir tank for a vehicle hydraulic device, a hydraulic brake device for a vehicle including the same, and a method for manufacturing a hydraulic fluid reservoir tank for the hydraulic device for a vehicle.

  Conventionally, in a vehicle such as an automobile, a vehicle hydraulic brake device that is a brake device using hydraulic pressure is used. Such a vehicular hydraulic brake device includes a master cylinder that generates hydraulic pressure in hydraulic fluid, and a reservoir tank that stores hydraulic fluid supplied to the master cylinder.

  In order for the master cylinder to generate a hydraulic pressure when the hydraulic pressure is required, a predetermined amount of hydraulic fluid needs to be stored in the reservoir tank. For this reason, the reservoir tank is provided with a liquid level detection unit. When the liquid level in the reservoir tank falls below a predetermined level, the liquid level detection unit detects that the liquid level is low, and the liquid level display device It is supposed to be displayed. By the display of the liquid amount display device, replenishment of the working fluid is promoted, and the liquid amount in the reservoir tank is secured to a predetermined amount or more.

  In such a reservoir tank, a float floating in the working fluid is used to detect the amount of the liquid. The float is disposed in a float chamber in the reservoir tank. The inside and outside of the float chamber communicate with each other by a slit provided in the partition wall forming the float chamber (see, for example, Patent Document 1).

JP 2011-25736 A

  In the technique disclosed in Patent Document 1, only one slit is provided in the partition wall. For this reason, even though the amount of liquid in the reservoir tank is less than a predetermined amount, the hydraulic fluid flows into the float chamber due to vehicle deceleration or the like, and the liquid level in the float chamber becomes high. The hydraulic fluid is difficult to be discharged from the slit. In addition, there is a problem that the time required for the float to return to the state in which the amount of liquid in the reservoir tank is less than the predetermined amount is displayed on the liquid amount display device is increased.

  The present invention has been made against the background of the above-described problems. The reservoir tank for the hydraulic fluid of the vehicle hydraulic device, the hydraulic brake device for the vehicle, and the response of the float in the float chamber are improved. It is an object of the present invention to obtain a method for manufacturing a reservoir tank of hydraulic fluid for a vehicle hydraulic device.

  The hydraulic fluid reservoir tank of the vehicle hydraulic device according to the present invention includes a casing in which a storage chamber for storing hydraulic fluid is formed, and the operation stored in the storage chamber from the bottom of the storage chamber. A partition wall standing along a side surface of the float floating in the liquid and forming a float chamber in a part of the storage chamber, wherein the partition wall includes a first opening, a second opening, , Including.

  The vehicle hydraulic brake device of the present invention includes the above-described hydraulic fluid reservoir tank and a master cylinder to which the reservoir tank is connected.

  The method for manufacturing a reservoir tank for hydraulic fluid of a hydraulic device for a vehicle according to the present invention is stored in the storage chamber from a casing in which a storage chamber for storing hydraulic fluid is formed, and a bottom portion of the storage chamber. A partition wall standing along a side surface of the float floating in the hydraulic fluid and forming a float chamber in a part of the storage chamber, the partition wall including a first opening, A hydraulic fluid reservoir tank manufacturing method for a hydraulic system for a vehicle, comprising: a first step of forming the partition wall having the first opening by molding; and the second opening. And a second step formed by processing.

  In the reservoir tank for hydraulic fluid of the hydraulic device for a vehicle and the hydraulic brake device for a vehicle according to the present invention, the partition wall includes a first opening and a second opening. For this reason, even though the amount of liquid in the reservoir tank is less than a predetermined amount, the hydraulic fluid flows into the float chamber due to vehicle deceleration or the like, and the liquid level in the float chamber becomes high. The hydraulic fluid is discharged early from the first opening and the second opening. That is, the float quickly returns to a state in which the liquid amount display device displays that the amount of liquid in the reservoir tank is less than the predetermined amount, thereby improving the responsiveness of the float in the float chamber.

  In the manufacturing method of the hydraulic fluid reservoir tank of the vehicle hydraulic device according to the present invention, the first step of forming the partition wall having the first opening by molding and the second step of forming the second opening by processing. And including. For this reason, manufacturing cost can be reduced by manufacturing a reservoir tank including the first opening and the second opening by diverting the mold used to form the reservoir tank including only the first opening. Can do. In addition, for example, when it is necessary to manufacture a plurality of types of reservoir tanks having different total opening areas, it is possible to reduce processing costs while using a common mold, thereby reducing manufacturing costs. Can do.

1 is a schematic configuration diagram showing a vehicle hydraulic brake device including a reservoir tank according to an embodiment of the present invention. It is a side view which shows the reservoir tank which concerns on embodiment of this invention. It is an upper view which shows the lower half body of the reservoir tank which concerns on embodiment of this invention. It is sectional drawing of the BB cross section of FIG. 3 which shows the reservoir tank which concerns on embodiment of this invention. It is a perspective view which shows the lower half body of the reservoir tank which concerns on embodiment of this invention. FIG. 4 is an enlarged view of a part A in FIG. 3 showing a liquid amount detection part of the reservoir tank according to the embodiment of the present invention. It is explanatory drawing which shows the state of the hydraulic fluid at the time of the vehicle deceleration in the reservoir tank which concerns on embodiment of this invention. It is a perspective view which shows the lower half body of the reservoir tank which concerns on the modification 1 of embodiment of this invention. It is a perspective view which shows the lower half body of the reservoir tank which concerns on the modification 2 of embodiment of this invention. It is a top view which shows the lower half body of the reservoir tank which concerns on the modification 3 of embodiment of this invention.

Hereinafter, a reservoir tank and a vehicle hydraulic brake device according to the present invention will be described with reference to the drawings.
Hereinafter, the case where the reservoir tank according to the present invention constitutes a part of the hydraulic brake device for a vehicle is described. However, the present invention is not limited to such a case, and the reservoir tank according to the present invention is A part of another vehicle hydraulic device (such as a vehicle hydraulic clutch device) may be configured.
Moreover, in each figure, illustration of a detailed part is simplified or abbreviate | omitted suitably.

Embodiment.
<Overall configuration of hydraulic brake device 100 for vehicle>
FIG. 1 is a schematic configuration diagram showing a vehicle hydraulic brake device 100 including a reservoir tank 1 according to an embodiment of the present invention.
The vehicle hydraulic brake device 100 is mounted on a vehicle such as an automobile.
As shown in FIG. 1, the vehicle hydraulic brake device 100 includes a reservoir tank 1, a brake pedal 2, a brake booster 3, and a brake cylinder 5.
The tandem master cylinder 4 corresponds to the master cylinder of the present invention.

The reservoir tank 1 is connected to the tandem master cylinder 4 and supplies brake fluid (working fluid) to the tandem master cylinder 4.
The brake pedal 2 is depressed when the driver brakes the vehicle.
The brake booster 3 boosts and outputs the pedal depression force when the driver depresses the brake pedal 2 with a predetermined servo ratio.
The tandem master cylinder 4 generates a pressure in the brake fluid according to the positions of the internal primary piston 4a and the secondary piston 4c.
The brake cylinder 5 generates a braking force by applying the hydraulic pressure generated by the tandem master cylinder 4 to an internal brake piston, and brakes each wheel 6.

<Configuration of reservoir tank 1 for brake fluid>
FIG. 2 is a side view showing the reservoir tank 1 according to the embodiment of the present invention. FIG. 3 is a top view showing the lower half 10 of the reservoir tank 1 according to the embodiment of the present invention. 4 is a cross-sectional view of the reservoir tank 1 according to the embodiment of the present invention, taken along the line BB in FIG. FIG. 5 is a perspective view showing the lower half 10 of the reservoir tank 1 according to the embodiment of the present invention.

When the reservoir tank 1 is mounted on a vehicle, the reservoir tank 1 has an elongated shape in the vehicle front-rear direction, and the rear is inclined downward. The casing 30 of the reservoir tank 1 includes a lower half 10 and an upper half 20. The periphery of the lower end opening (not shown) of the upper half 20 is welded liquid-tightly along the horizontal plane to the periphery of the upper end opening 14 of the lower half 10 by heating and pressurization. The casing 30 of the reservoir tank 1 is formed with a detection portion storage chamber 40 for storing brake fluid, a primary storage chamber 50, a secondary storage chamber 60, and a clutch storage chamber 70.
The detection unit storage chamber 40, the primary storage chamber 50, the secondary storage chamber 60, and the clutch storage chamber 70 correspond to the storage chamber of the present invention.

  In the reservoir tank 1, a minimum storage level (MIN line) and a maximum storage level (MAX line) of the brake fluid in a state where the liquid level is horizontal are set.

  The detection unit storage chamber 40 is provided with a liquid amount detection unit 41. The liquid amount detection unit 41 will be described later.

  The primary storage chamber 50 is located at the center of the reservoir tank 1. For reinforcement, four ribs 51 a, 51 b, 51 c, 51 d extending in a direction orthogonal to the vehicle front-rear direction are erected on the bottom of the lower half body 10. The two ribs 51 a and 51 b on the vehicle front side also serve as a partition wall that partitions the detection unit storage chamber 40 and the primary storage chamber 50.

  The primary storage chamber 50 and the secondary storage chamber 60 are partitioned by a partition wall 11 erected on the bottom of the lower half 10 so as to extend in a direction orthogonal to the vehicle front-rear direction. The secondary storage chamber 60 and the clutch storage chamber 70 are partitioned by a partition wall 12 erected on the bottom of the lower half body 10 so as to extend in a direction orthogonal to the vehicle longitudinal direction.

  A part of the partition wall 11 that partitions the primary storage chamber 50 and the secondary storage chamber 60 is recessed downward in a U shape. The partition wall 12 that partitions the secondary storage chamber 60 and the clutch storage chamber 70 is also formed in the upper half 20.

  The partition wall 11 that partitions the primary storage chamber 50 and the secondary storage chamber 60 is bent toward the rear of the vehicle. The partition wall 12 that partitions the secondary storage chamber 60 and the clutch storage chamber 70 is bent toward the front of the vehicle. The two partition walls 11, 12 are connected to the partition wall 13 that partitions the primary storage chamber 50 and the clutch storage chamber 70 extending in a direction orthogonal to the vehicle longitudinal direction. The height of the partition wall 13 that partitions the primary storage chamber 50 and the clutch storage chamber 70 is higher than the partition wall 11 that partitions the primary storage chamber 50 and the secondary storage chamber 60, and the secondary storage chamber 60 and the clutch storage chamber. It is lower than the partition wall 12 that partitions the chamber 70.

  A primary fluid passage port 52 for supplying brake fluid to the secondary fluid chamber 4 d of the tandem master cylinder 4 is provided at the bottom of the primary storage chamber 50. A secondary fluid passage port 61 for supplying brake fluid to the primary fluid chamber 4 b of the tandem master cylinder 4 is provided at the bottom of the secondary storage chamber 60. A clutch fluid passage 71 for supplying brake fluid to the clutch is provided on the side wall of the clutch storage chamber 70.

  A liquid supply port 80 for supplying brake fluid into the reservoir tank 1 is provided in the center of the upper half 20 of the reservoir tank 1. The liquid supply port 80 is provided with a cap 81 for opening and closing the liquid supply port 80. Below the liquid supply port 80, a liquid supply passage 82 formed by a cylindrical member is provided. A lower portion of the liquid supply passage 82 communicates with the primary storage chamber 50.

The detection unit storage chamber 40 is provided with a liquid amount detection unit 41.
The liquid amount detection unit 41 floats in the switch housing portion 42 provided in the lower part of the lower half 10, the normally open type reed switch (not shown) housed in the switch housing portion 42, and the brake fluid in the reservoir tank 1. And a float 43 that moves up and down in accordance with the amount of brake fluid, and a magnet (not shown) that is fixed to the bottom of the float 43 and moves up and down integrally with the float 43 to open and close the reed switch. Reed switches and magnets may be replaced with switches that operate on other principles.

The reservoir tank 1 has a cylindrical guide wall 45 erected along the side surface of the float 43 floating in the brake fluid stored in the detection unit storage chamber 40 from the bottom of the detection unit storage chamber 40. A float chamber 44 is formed in a part of the detection unit storage chamber 40 by the cylindrical guide wall 45. That is, the float chamber 44 is a space defined by the cylindrical guide wall 45.
The cylindrical guide wall 45 corresponds to the partition wall of the present invention.

  The float chamber 44 is formed on the vehicle front side with respect to the primary storage chamber 50 in a state mounted on the vehicle. That is, the float chamber 44 is formed at a position away from the center in the vehicle longitudinal direction of the reservoir tank 1. A gap is formed between the upper end of the cylindrical guide wall 45 that defines the float chamber 44 and the upper half 20, and the upper end of the float chamber 44 is open.

  The upper half 20 is formed with a cylindrical protrusion 21 positioned above the float chamber 44. The cylindrical protrusion 21 prevents the float 43 from coming out of the float chamber 44 from above the cylindrical guide wall 45.

FIG. 6 is an enlarged view of a portion A in FIG. 3 showing the liquid amount detection unit 41 of the reservoir tank 1 according to the embodiment of the present invention.
A first slit 46 and a second slit 47 are formed in the cylindrical guide wall 45. The first slit 46 and the second slit 47 are longitudinal notches extending from the upper end of the cylindrical guide wall 45 toward the bottom of the detection unit storage chamber 40. The lower ends of the first slit 46 and the second slit 47 are located above the bottom of the lower half body 10.
The first slit 46 and the second slit 47 correspond to the first opening and the second opening of the present invention.

  The first slit 46 is formed in the first circumferential direction 91 on the side surface of the float 43. The second slit 47 is formed in a second circumferential direction 92 different from the first circumferential direction 91 on the side surface of the float 43. The float 43 may be cylindrical or prismatic. The first circumferential direction 91 is a direction substantially coincident with the vehicle front direction with respect to the center of the float 43 disposed in the float chamber 44. The second circumferential direction 92 is a direction that is shifted laterally from the center of the float 43 arranged in the float chamber 44 by a predetermined acute angle from the vehicle front direction. That is, the first slit 46 and the second slit 47 are located on the vehicle front side with respect to the float 43. The first circumferential direction 91 and the second circumferential direction 92 may be shifted to different sides with respect to the vehicle front direction. Further, the deviation angles may be different from each other.

A first groove 43 a is formed on a side surface of the float 43 in a region located between the first circumferential direction 91 and the second circumferential direction 92. A second groove 43b is formed on the side surface of the float 43 on the opposite side of the first groove 43a with respect to the center of the float 43.
On the other hand, on the inner surface of the cylindrical guide wall 45, a first linear protrusion 45c and a second linear protrusion 45d that are engaged with the first groove 43a and the second groove 43b are formed, respectively.
The first linear protrusion 45 c extends to the bottom of the detection unit storage chamber 40 and is formed in a region 45 a that is a region between the first circumferential direction 91 and the second circumferential direction 92 in the cylindrical guide wall 45. Has been.
The second linear protrusion 45 d extends to the bottom of the detection unit storage chamber 40 and is formed in a region 45 b that is a region other than the region 45 a in the cylindrical guide wall 45.

  The first linear protrusion 45c and the second linear protrusion 45d engage with the first groove 43a and the second groove 43b, respectively, so that the float 43 is guided in the vertical direction and the rotation of the float 43 is restricted. . By restricting the rotation of the float 43, the degree of freedom of the shape of the magnet fixed to the lower portion of the float 43 is improved. For example, the magnet can be rectangular.

<Operation of Brake Fluid Reservoir Tank 1>
The float chamber 44 communicates with the outside of the float chamber 44 by the first slit 46 and the second slit 47 formed in the cylindrical guide wall 45 and the upper end of the cylindrical guide wall 45. Therefore, when the vehicle is running or stopped at a constant speed on a horizontal road surface, and the level of the brake fluid in the reservoir tank 1 is located above the first slit 46 and the second slit 47 The liquid level of the brake fluid in the float chamber 44 is equal to the height of the liquid level in the detection unit storage chamber 40, the primary storage chamber 50, the secondary storage chamber 60, and the clutch storage chamber 70.

  When the amount of brake fluid in the reservoir tank 1 decreases to a level below the MIN line, the switch is turned on by the lowering of the float 43, and the fluid level display device displays that the amount of brake fluid is small. The Specifically, when the float 43 floating in the brake fluid descends, the reed switch is turned on by the magnetic force of a magnet fixed to the bottom of the float 43.

Here, a case where the vehicle accelerates will be described.
When the vehicle is accelerated, the brake fluid in the reservoir tank 1 moves in the vehicle rearward direction, and the level of the brake fluid in the float chamber 44 is lowered. At this time, the first slit 46 and the second slit 47 are located on the vehicle front side of the cylindrical guide wall 45, and the brake fluid in the float chamber 44 is discharged from the first slit 46 and the second slit 47. Since it is difficult to be discharged, the fluctuation of the liquid level in the float chamber 44 is suppressed. This suppresses the reed switch from being turned on even though the brake fluid is sufficient.

FIG. 7 is an explanatory diagram showing a state of the brake fluid when the vehicle is decelerated in the reservoir tank 1 according to the embodiment of the present invention.
Next, a case where the vehicle decelerates will be described.
When the vehicle decelerates, as shown in FIG. 7, the brake fluid in the reservoir tank 1 moves in the front direction of the vehicle, and from above the first slit 46, the second slit 47, and the cylindrical guide wall 45, Flows into the float chamber 44, and the level of the brake fluid in the float chamber 44 increases. At this time, the level of the brake fluid in the float chamber 44 is lower than the MIN line even though the brake fluid in the reservoir tank 1 is insufficient to the extent that the level in the horizontal state is lower than the MIN line. In some cases, it becomes high and the fact that the brake fluid is insufficient is not displayed on the fluid amount display device.

  When the deceleration of the vehicle is finished and the brake fluid in the reservoir tank 1 returns to the horizontal state, the brake fluid in the float chamber 44 is discharged from the first slit 46 and the second slit 47. At that time, the first slit 46 and the second slit 47 are formed in the float chamber 44 of the reservoir tank 1, that is, a plurality of openings are formed, so that the brake fluid in the float chamber 44 is discharged. The time required for returning to the state in which the brake fluid in the reservoir tank 1 is lower than the MIN line and causing the fluid amount display device to display it is shortened.

  Here, when the vehicle decelerates, the float 43 moves to the front side of the vehicle, and the gap between the side surface of the float 43 and the region on the front side of the cylindrical guide wall 45 becomes narrow. In the reservoir tank 1, the first slit 46 and the second slit 47 are formed in the first circumferential direction 91 and the second circumferential direction 92, that is, they are formed in different circumferential directions. Therefore, for example, even if it becomes difficult for the brake fluid to flow out from the first slit 46, it can flow out from the second slit 47. This effect is promoted because the first circumferential direction 91 and the second circumferential direction 92 are shifted to different sides with respect to the vehicle front direction. Further, this effect is promoted by the difference in the angle of deviation.

  Although the case where the vehicle accelerates and decelerates has been described above, the same phenomenon occurs when the vehicle travels uphill and downhill. That is, when the vehicle travels uphill, the brake fluid in the reservoir tank 1 moves in the rearward direction of the vehicle as in the case where the vehicle accelerates, and the level of the brake fluid in the float chamber 44 is low. Become. Even when the vehicle travels uphill, the brake fluid in the reservoir tank 1 moves in the front direction of the vehicle and the level of the brake fluid in the float chamber 44 is high, as in the case where the vehicle decelerates. Become. That is, the above-described configuration is effective not only when the vehicle accelerates and decelerates but also when the vehicle travels uphill and downhill.

<Manufacturing Method of Brake Fluid Reservoir Tank 1>
(First step)
The upper half 20 and the lower half 10 are made of resin, for example, and are formed by molding. The lower half body 10 is formed by a mold having recesses corresponding to the partition walls 11, 12, 13 and the cylindrical guide wall 45. Further, the mold is formed with a recess corresponding to the first linear protrusion 45 c and the second linear protrusion 45 d and a protrusion corresponding to the first slit 46. That is, the first slit 46 is formed when the cylindrical guide wall 45 is formed.

(Second step)
After the first step, the cylindrical guide wall 45 is subjected to processing such as cutting to form the second slit 47. That is, since the second slit 47 is formed by processing, the necessity of changing the mold for changing the opening area is reduced, and the cost of the reservoir tank 1 is reduced.

(Third step)
After the second step, the float 43 is disposed in the float chamber 44 and the upper half 20 is welded to the lower half 10.
Thereafter, the reservoir tank 1 is mounted on the vehicle, a reed switch is mounted, and the brake fluid is filled.

<Effects of brake fluid reservoir tank 1>
The reservoir tank 1 includes a cylindrical guide wall 45 including a first slit 46 and a second slit 47. With this configuration, the brake fluid liquid in the float chamber 44 is insufficient even though the brake fluid in the reservoir tank 1 is insufficient to the extent that the liquid level in the horizontal state is lower than the MIN line. When the surface becomes high, discharge of the brake fluid in the float chamber 44 is promoted. Therefore, the return time to the state in which the brake fluid in the reservoir tank 1 is lower than the MIN line is displayed on the fluid amount display device is shortened, and the float 43 in the float chamber 44 is Responsiveness is improved.

  Preferably, the first slit 46 is formed in the first circumferential direction 91 on the side surface of the float 43, and the second slit 47 is formed in the second circumferential direction 92 different from the first circumferential direction 91 on the side surface of the float 43. Yes. With this configuration, for example, even when the float 43 approaches the first slit 46 side and the distance between the first slit 46 and the side surface of the float 43 becomes narrow, the second slit 47 and the float A clearance with the side surface of 43 is secured, and the discharge of the brake fluid in the float chamber 44 is promoted. Therefore, the return time to the state in which the brake fluid in the reservoir tank 1 is displayed on the fluid amount display device that the brake fluid is lower than the MIN line is shortened.

  Preferably, when mounted on the vehicle, the float chamber 44 is positioned on the vehicle front side of the reservoir tank 1, and the first slit 46 and the second slit 47 are positioned on the vehicle front side of the float 43. . With this configuration, when the brake fluid in the reservoir tank 1 moves in the rearward direction of the vehicle, the brake fluid in the float chamber 44 is difficult to be discharged, and fluctuations in the fluid level in the float chamber 44 are suppressed. Is done. Therefore, it is possible to suppress the reed switch from being turned on even though the brake fluid is sufficient.

  Preferably, the lower ends of the first slit 46 and the second slit 47 are located above the bottom of the detection unit storage chamber 40. With this configuration, when the brake fluid in the reservoir tank 1 moves in the rearward direction of the vehicle, the brake fluid in the float chamber 44 becomes difficult to be discharged, and the brake fluid is sufficient although the brake fluid is sufficient. The lead switch is suppressed from being turned on.

  Preferably, a first groove 43a is formed on the side surface of the float 43, and a first linear protrusion 45c engaged with the first groove 43a is formed on the inner surface of the cylindrical guide wall 45, and the first The linear protrusion 45 c is formed between the first slit 46 and the second slit 47 so as to extend to the bottom of the detection unit storage chamber 40. By being configured in this way, the region between the first circumferential direction 91 and the second circumferential direction 92 in the cylindrical guide wall 45 using the first linear protrusion 45 c that guides the float 43. The region 45a, which is a region narrower than 45b, can be reinforced.

  Further, the vehicle hydraulic brake device 100 includes a reservoir tank 1 and a tandem master cylinder 4 to which the reservoir tank 1 is connected. The reservoir tank 1 including the first slit 46 and the second slit 47 improves the responsiveness of the float 43 during acceleration and deceleration of the vehicle or traveling on the slope of the vehicle, and erroneous lighting of the display device. Therefore, the float chamber 44 in the reservoir tank 1 can be shifted in the vehicle front-rear direction, and the vehicle hydraulic brake device 100 with a reduced size can be obtained.

  In addition, the reservoir tank 1 is manufactured by the first step of forming the cylindrical guide wall 45 having the first slit 46 by molding and the second step of forming the second slit 47 by cutting. For this reason, the reservoir tank 1 having the first slit 46 and the second slit 47 is manufactured by diverting the mold used to form the reservoir tank 1 having only the first slit 46, thereby reducing the manufacturing cost. Can be reduced. Further, for example, when it is necessary to manufacture a plurality of types of reservoir tanks 1 having different opening areas, it is possible to reduce processing costs while using a common mold, thereby reducing manufacturing costs. be able to.

<Modification 1>
FIG. 8 is a perspective view showing the lower half 10 of the reservoir tank 1 according to the first modification of the embodiment of the present invention.
As shown in FIG. 8, in the first modification, the region 45 a between the first circumferential direction 91 and the second circumferential direction 92 in the cylindrical guide wall 45 is the other of the cylindrical guide walls 45. It is thicker than the region 45b.
By being configured in this way, it is possible to reinforce the region 45a that is narrower than the region 45b between the first circumferential direction 91 and the second circumferential direction 92 in the cylindrical guide wall 45. it can.

<Modification 2>
FIG. 9 is a perspective view showing a lower half body 10 of the reservoir tank 1 according to Modification 2 of the embodiment of the present invention.
As shown in FIG. 9, in the modification 2, the 1st slit 46 and the 2nd slit 47 are the shapes where a width | variety becomes wide toward the upper side.
With this configuration, for example, when the brake fluid in the reservoir tank 1 returns to a horizontal state after deceleration of the vehicle, the amount of brake fluid discharged in the float chamber 44 gradually decreases. It becomes. Therefore, both the improvement of the brake fluid discharge speed in the float chamber 44 and the suppression of the fluctuation of the fluid level in the float chamber 44 near the end of the brake fluid discharge in the float chamber 44 are achieved.

<Modification 3>
FIG. 10 is a top view showing the lower half 10 of the reservoir tank 1 according to the third modification of the embodiment of the present invention.
As shown in FIG. 10, in Modification 3, the first slit 46 and the protrusion 43 c formed on the side surface of the float 43 are replaced with the first groove 43 a and the first linear protrusion 45 c. The float 43 is guided by the set.
By being configured in this way, it is possible to use various shapes of the float 43 while suppressing the shape of the reservoir tank 1 from being complicated.
The protrusion 43 c may be engaged with the second slit 47. Furthermore, instead of the set of the second groove 43b and the second linear protrusion 45d, the float 43 is guided by the set of the second slit 47 and another protrusion formed on the side surface of the float 43. May be.

  Although the case where the first slit 46 and the second slit 47 are formed in the cylindrical guide wall 45 has been described above, other openings such as holes may be formed. In addition to the first slit 46 and the second slit 47, other openings may be formed.

1 reservoir tank, 2 brake pedal, 3 brake booster, 4 tandem master cylinder, 4a primary piston, 4b primary fluid chamber, 4c secondary piston, 4d secondary fluid chamber, 5 brake cylinder, 6 wheels, 10 lower half body, 11 Partition wall, 12 Partition wall, 13 Partition wall, 14 Upper end opening, 20 Upper half, 21 Cylindrical protrusion, 30 Casing, 40 Detector storage chamber, 41 Liquid volume detector, 42 Switch housing, 43 Float, 43a First groove, 43b Second groove, 43c Projection, 44 Float chamber, 45 Cylindrical guide wall, 45a region, 45b region, 45c First linear projection, 45d Second linear projection, 46 First slit, 47 Second Slit, 50 Primary reservoir, 51a rib, 51b rib, 51c rib, 51d rib, 52 Primary fluid passage 60, secondary storage chamber, 61 secondary fluid passage port, 70 clutch storage chamber, 71 clutch fluid passage port, 80 fluid supply port, 81 cap, 82 fluid supply passage, 91 first circumferential direction, 92 second circumferential direction, 100 Hydraulic brake device for vehicles.

Claims (10)

A casing in which a storage chamber for storing hydraulic fluid is formed;
A partition wall standing from the bottom of the storage chamber along a side surface of the float floating in the hydraulic fluid stored in the storage chamber, and forming a float chamber in a part of the storage chamber;
With
The partition wall, viewed contains a first opening, a second opening, and
The first opening is formed in a first circumferential direction of a side surface of the float;
The second opening is formed in a second circumferential direction different from the first circumferential direction of the side surface of the float;
When mounted on a vehicle,
The float chamber is located on the vehicle front side in the storage chamber;
The first opening and the second opening are located on the vehicle front side of the float;
A hydraulic fluid reservoir tank for a vehicle hydraulic device. A lower end of at least one of the first opening and the second opening is located above the bottom;
A reservoir tank for hydraulic fluid of the vehicle hydraulic device according to claim 1. At least one of the first opening and the second opening has a shape whose width increases toward the upper side.
A reservoir tank for hydraulic fluid of the vehicle hydraulic device according to claim 1 . Of the partition wall, the region located between the first circumferential direction and the second circumferential direction is thicker than other regions of the partition wall.
The reservoir tank of the hydraulic fluid of the hydraulic apparatus for vehicles as described in any one of Claims 1-3 . A groove is formed on a side surface of the float,
A linear protrusion engaged with the groove is formed on the inner surface of the partition wall,
The linear protrusion extends to the bottom and is formed between the first opening and the second opening.
The reservoir tank of the hydraulic fluid of the hydraulic apparatus for vehicles as described in any one of Claims 1-4 . The first opening and the second opening are slits extending from an upper end of the partition wall toward the bottom part,
The reservoir tank of the hydraulic fluid of the hydraulic apparatus for vehicles as described in any one of Claims 1-5 . A protrusion engaging with the first opening or the second opening is formed on a side surface of the float.
A reservoir tank for hydraulic fluid of the vehicle hydraulic device according to claim 6 . The first opening is formed when the partition wall is molded,
The second opening was formed by processing.
The reservoir tank of the hydraulic fluid of the hydraulic apparatus for vehicles as described in any one of Claims 1-7 . A hydraulic fluid reservoir tank of the vehicle hydraulic device according to any one of claims 1 to 8,
A master cylinder to which the reservoir tank is connected;
With
Hydraulic brake device for vehicles. A casing in which a storage chamber for storing hydraulic fluid is formed;
A partition wall standing from the bottom of the storage chamber along a side surface of the float floating in the hydraulic fluid stored in the storage chamber, and forming a float chamber in a part of the storage chamber;
With
The partition wall includes a first opening and a second opening;
A method of manufacturing a reservoir tank of hydraulic fluid for a vehicle hydraulic device,
A first step of forming the partition wall having the first opening by molding;
A second step of forming the second opening by processing;
including,
A method for producing a reservoir tank for hydraulic fluid of a vehicle hydraulic device.

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