Liquid storage tank and brake fluid pressure generating device

Abstract

A liquid storage tank according to an embodiment includes, as an example, an upper case; a lower case coupled to the upper case; a partition wall extending from the upper case toward the lower case and horizontally partitioning a first compartment and a second compartment included in a space inside the upper case and the lower case coupled to each other; and a partition member having a first wall covering the first compartment from below and a second wall protruding upward from the first wall and coming into contact with the partition wall, the partition wall being provided with a first slit opening at the lower edge of the partition wall and communicating the first compartment and the second compartment, at least the edge of the first slit and the second wall form a first hole which communicates the first compartment and the second compartment and is located above the first wall.

Description

Technical Field

[0001] Embodiments of the present invention relate to a fluid reservoir and a brake fluid pressure generating device. Background Art

[0002] Conventionally, a reservoir tank is known whose internal space is divided into a plurality of compartments (Patent Document 1). For example, the plurality of compartments store liquids individually or communicate with each other so that the liquids flow along a desired path.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-69977 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] However, in the conventional structure, there are cases where the arrangement of the hole connecting the two compartments is limited. For example, when the hole is formed by injection molding using a sliding core, the design of the reservoir is limited to the part where the sliding core can move.

[0008] Therefore, the present invention is made in view of the above-mentioned technical problems, and provides a fluid reservoir and a brake fluid pressure generating device that can improve the degree of freedom in design.

[0009] Technical means for solving technical problems

[0010] The liquid storage tank according to an embodiment of the present invention comprises, as an example, an upper shell; a lower shell located below the upper shell and coupled to the upper shell; a partition wall extending from the upper shell toward the lower shell and horizontally partitioning a first compartment and a second compartment contained in a space inside the upper shell and the lower shell coupled to each other; and a partition member having a first wall covering the first compartment from below and a second wall protruding upward from the first wall and abutting against the partition wall, wherein the partition wall is provided with a first slit opening at an edge below the partition wall and connecting the first compartment and the second compartment, and at least the edge of the first slit and the second wall form a first hole connecting the first compartment and the second compartment and located above the first wall. Therefore, as an example, the liquid storage tank can form a first hole with a high degree of freedom of configuration by combining the first slit and the partition member. Therefore, the liquid storage tank can improve the degree of freedom of design. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a diagram schematically showing a brake fluid pressure generating device according to an embodiment.

[0012] Figure 2 It is a cross-sectional view showing a part of the reservoir tank according to the above embodiment.

[0013] Figure 3 It is along Figure 1 The F3-F3 line is a perspective view showing a cross section of the liquid storage tank of the above embodiment.

[0014] Figure 4 It is a perspective view showing the inner cover of the above embodiment.

[0015] Figure 5 is from Figure 2 A cross-sectional view of a portion of the reservoir tank of the above embodiment is shown on the opposite side of FIG. DETAILED DESCRIPTION

[0016] Below, refer to Figures 1 to 5 , an embodiment is described. In addition, in this specification, vertically upward is basically defined as the upward direction, and vertically downward is defined as the downward direction. In addition, in this specification, sometimes multiple expressions are used to record the structural elements involved in the embodiment and the description of the elements. The structural elements and their descriptions are examples and are not limited by the expressions of this specification. Structural elements can also be specified by names different from the names in this specification. In addition, structural elements can also be described by expressions different from the expressions of this specification.

[0017] Figure 1 1 is a diagram schematically showing a brake fluid pressure generating device 10 according to the present embodiment. The brake fluid pressure generating device 10 is mounted on a vehicle 1 such as an automobile, for example. The brake fluid pressure generating device 10 generates the pressure (fluid pressure) of the brake fluid in the fluid circuit of the brake device of the vehicle 1. The brake fluid pressure generating device 10 is not limited to this example.

[0018] like Figure 1 As shown, the brake fluid pressure generating device 10 includes a hydraulic booster 11, a reservoir tank 12, a brake pedal 13, and a master cylinder 14. The hydraulic booster 11 is an example of a pressure regulating device. In addition, the pressure regulating device may also be other components such as the master cylinder 14 that can pressurize or depressurize the brake fluid. The brake fluid pressure generating device 10 may also further include various devices such as a pump.

[0019] The hydraulic booster 11 is a brake booster connected to a fluid path of the brake device and amplifies the pedal force of the brake pedal 13 to pressurize the brake fluid in the master cylinder 14 .

[0020] For example, the master cylinder 14 is connected to a plurality of wheel cylinders 15 via a fluid path of a brake device. By pressurizing the brake fluid in the master cylinder 14, the brake pads connected to the wheel cylinders 15 are pressed by the brake discs, thereby exerting a braking force. In addition, the brake fluid pressure generating device 10 is not limited to magnetic disc brakes, and can also be mounted on other brake devices such as drum brakes.

[0021] The reservoir tank 12 is connected to the hydraulic booster 11. The reservoir tank 12 stores brake fluid inside the reservoir tank 12. The brake fluid in the reservoir tank 12 is supplied to the hydraulic booster 11. In addition, the brake fluid discharged from the hydraulic booster 11 can be stored in the reservoir tank 12. The reservoir tank 12 can also be further connected to the master cylinder 14 and other devices such as a pump.

[0022] As shown in the drawings, in this specification, for the convenience of explanation, an X-axis, a Y-axis, and a Z-axis are defined. The X-axis, the Y-axis, and the Z-axis are orthogonal to each other. The X-axis is arranged along the width of the liquid storage tank 12. The Y-axis is arranged along the length of the liquid storage tank 12. The Z-axis is arranged along the height of the liquid storage tank 12.

[0023] Furthermore, in this specification, the X direction, the Y direction, and the Z direction are defined. The X direction is a direction along the X axis, including the +X direction indicated by the arrow of the X axis, and the -X direction which is the opposite direction of the arrow of the X axis. The Y direction is a direction along the Y axis, including the +Y direction indicated by the arrow of the Y axis, and the -Y direction which is the opposite direction of the arrow of the Y axis. The Z direction is a direction along the Z axis, including the +Z direction indicated by the arrow of the Z axis, and the -Z direction which is the opposite direction of the arrow of the Z axis.

[0024] The following description describes the reservoir tank 12 in a state where the vehicle 1 is arranged on a horizontal ground. In this case, the +Z direction is the upward direction and the -Z direction is the downward direction. In addition, the reservoir tank 12 may be mounted on the brake fluid pressure generating device 10 so that the Z direction is slightly different from the vertical direction.

[0025] Figure 2 It is a cross-sectional view showing a part of the reservoir tank 12 according to the present embodiment. Figure 3 It is along Figure 1 The F3-F3 line of FIG. 1 shows a perspective view of a cross section of the liquid storage tank 12 of the present embodiment. Figures 1 to 3 As shown, the reservoir tank 12 includes an upper case 21, a lower case 22, an inner cover 23, a plurality of filters 24, and a float 25. The inner cover 23 is an example of a partition member.

[0026] For example, the upper shell 21, the lower shell 22, the inner cover 23 and the filter 24 are made of synthetic resins such as polypropylene and polyethylene. In addition, at least one of the upper shell 21, the lower shell 22, the inner cover 23 and the filter 24 can also be made of other materials.

[0027] The upper shell 21, the lower shell 22, the inner cover 23 and the filter 24 are connected to each other by welding, for example. For example, the upper shell 21 and the inner cover 23 are connected to each other, and the lower shell 22 and the filter 24 are connected to each other. Furthermore, the upper shell 21 is connected to the lower shell 22 located below the upper shell 21. The upper shell 21 and the lower shell 22 connected to each other are formed into a box shape, and a space S is provided inside.

[0028] like Figure 1 As shown, the upper housing 21 has an upper wall 31, a side wall 32, and a plurality of partition walls 33, 34. The upper wall 31, the side wall 32, and the partition walls 33, 34 are formed as one body. In addition, the upper wall 31, the side wall 32, and the partition walls 33, 34 may also be different components from each other.

[0029] The oil filling port 35 is provided in the upper wall 31. The oil filling port 35 penetrates the upper wall 31 substantially in the Z direction, and communicates the space S with the outside of the reservoir 12. The reservoir 12 can be supplied with brake fluid through the oil filling port 35. The oil filling port 35 is closed by, for example, a cap.

[0030] The side wall 32 extends from the edge of the upper wall 31 in the substantially -Z direction. That is, the side wall 32 extends from the upper shell 21 toward the lower shell 22. The side wall 32 extends endlessly from the edge of the upper wall 31 along the edge of the upper wall 31. In other words, the side wall 32 is formed in a cylindrical shape. The side wall 32 surrounds the space S.

[0031] The edge 32a of the side wall 32 in the -Z direction (downward direction) is inclined obliquely relative to the horizontal direction. In this embodiment, the edge 32a of the side wall 32 in the -Z direction is inclined obliquely downward relative to the -Y direction. Figure 1 The edge 32a of the side wall 32 in the -Z direction is arranged on substantially the same plane. In addition, the edge 32a of the side wall 32 in the -Z direction is not limited to this example.

[0032] A plurality of partition walls 33, 34 extend from the upper wall 31 in a substantially -Z direction. That is, the partition walls 33, 34 extend from the upper shell 21 toward the lower shell 22. In addition, the partition walls 33, 34 may extend in a direction obliquely inclined relative to the vertical direction. The partition walls 33, 34 divide the inner part of the upper shell 21 in the space S into a plurality of compartments in the horizontal direction.

[0033] like Figure 3As shown, the partition wall 33 is spaced apart from the side wall 32. The partition wall 33 is formed into a substantially elliptical cylindrical shape that is long in the Y direction. For example, the partition wall 33 has two arc-shaped portions 37 and two straight-line portions 38 located between the two arc-shaped portions. The shape of the partition wall 33 is not limited to this example. The partition wall 34, for example, extends between the side wall 32 and the partition wall 33.

[0034] like Figure 1 As shown, the lower housing 22 has a lower wall 41, a side wall 42, and a plurality of partition walls 43. The lower wall 41, the side wall 42, and the partition walls 43 are formed as one body. In addition, the lower wall 41, the side wall 42, and the partition walls 43 may also be different components from each other.

[0035] The lower wall 41 is located below the upper housing 21. The side wall 42 extends from the edge of the lower wall 41 in the substantially +Z direction. The side wall 42 extends endlessly from the edge of the lower wall 41 along the edge of the lower wall 41. In other words, the side wall 42 is formed in a cylindrical shape. The side wall 42 surrounds the space S.

[0036] The edge 42a of the side wall 42 in the +Z direction (upward direction) is inclined obliquely relative to the horizontal direction along the edge 32a of the side wall 32 of the upper shell 21. The edge 42a of the side wall 42 in the +Z direction is set on a substantially same plane. In addition, the edge 42a of the side wall 42 in the +Z direction is not limited to this example.

[0037] The edge 42a of the side wall 42 abuts against the edge 32a of the side wall 32. The upper shell 21 and the lower shell 22 are joined together by welding the edge 32a of the side wall 32 and the edge 42a of the side wall 42. In addition, the upper shell 21 and the lower shell 22 may be joined together by other methods.

[0038] A plurality of ports 48 are provided on the lower wall 41 and the side wall 42. The ports 48 each penetrate the lower wall 41 or the side wall 42 to connect the space S with the outside of the reservoir 12. The ports 48 are connected to the master cylinder 14 and the hydraulic booster 11 via, for example, a fluid path of a brake device. In addition, at least one of the plurality of ports 48 may be connected to another device.

[0039] A plurality of partition walls 43 extend from the lower wall 41 in the substantially +Z direction. The partition walls 43 may extend in a direction obliquely inclined relative to the vertical direction. The partition walls 43 each partition a portion of the inner side of the lower housing 22 in the space S into a plurality of compartments in the horizontal direction.

[0040] The inner cover 23 is arranged in the space S. The inner cover 23 is inserted into the inner side of the partition wall 33 of the upper case 21 from below, for example. In addition, the inner cover 23 is not limited to this example.

[0041] Figure 42 is a perspective view showing the inner cover 23 of this embodiment. Figure 4 As shown, the inner cover 23 has a bottom wall 51, a peripheral wall 52, and a plurality of ribs 53. The bottom wall 51 is an example of a first wall, and the peripheral wall 52 is an example of a second wall.

[0042] The bottom wall 51 is formed in a substantially elliptical plate shape that is long in the Y direction. The bottom wall 51 has an inclined portion 61 and a horizontal portion 62. The inclined portion 61 is substantially parallel to the edges 32a and 42a of the side walls 32 and 42 and is inclined obliquely downward relative to the +Y direction. The horizontal portion 62 extends from the end of the inclined portion 61 in the +Y direction to the substantially +Y direction.

[0043] The peripheral wall 52 protrudes upward from the bottom wall 51, for example, toward the upper wall 31 of the upper housing 21. In the present embodiment, the peripheral wall 52 protrudes from the edge of the bottom wall 51 in the substantially +Z direction, and extends endlessly along the edge of the bottom wall 51 and the partition wall 33. In other words, it is formed into a substantially elliptical cylindrical shape that is long in the Y direction. For example, the peripheral wall 52 has two arc-shaped portions 65 and two straight-line portions 66 located between the two arc-shaped portions.

[0044] like Figure 2 As shown, the partition wall 33 has a first inner surface 33a, a lower edge 33b, an outer surface 33c, a second inner surface 33d, and a step 33e. The lower edge 33b is an example of an edge in the lower direction of the partition wall.

[0045] The first inner surface 33a is a substantially elliptical cylindrical curved surface facing the inside of the cylindrical partition wall 33. The lower edge 33b is an edge of the partition wall 33 in the -Z direction. The lower edge 33b is inclined obliquely relative to the horizontal direction along the edge 32a of the side wall 32. The lower edge 33b is provided on substantially the same plane as the edge 32a of the side wall 32. In addition, the lower edge 33b is not limited to this example.

[0046] The outer surface 33c is a substantially elliptical cylindrical curved surface facing the outside of the cylindrical partition wall 33. The outer surface 33c is located on the opposite side of the first inner surface 33a. The end of the outer surface 33c in the -Z direction is connected to the lower edge 33b. On the other hand, the end of the first inner surface 33a in the -Z direction is located above the lower edge 33b.

[0047] The second inner surface 33d is located on the opposite side of the outer surface 33c and is at least partially located below the first inner surface 33a. The second inner surface 33d is a substantially elliptical cylindrical curved surface facing the inner side of the cylindrical partition wall 33. The end of the second inner surface 33d in the -Z direction is connected to the lower edge 33b.

[0048] The second inner surface 33d is located between the first inner surface 33a and the outer surface 33c in the horizontal direction. That is, the portion between the second inner surface 33d and the outer surface 33c in the partition wall 33 is thinner than the portion between the first inner surface 33a and the outer surface 33c.

[0049] The step 33e connects the end of the first inner surface 33a in the -Z direction and the end of the second inner surface 33d in the +Z direction. The step 33e is a substantially horizontal plane facing substantially in the -Z direction. In addition, the step 33e may be inclined obliquely relative to the horizontal direction.

[0050] The peripheral wall 52 is embedded inside the second inner surface 33d and abuts against the step 33e. The peripheral wall 52 has an inner surface 52a, an upper edge 52b, and an outer surface 52c.

[0051] The inner surface 52a is a substantially elliptical cylindrical curved surface facing the inside of the cylindrical peripheral wall 52. The upper edge 52b is an edge of the peripheral wall 52 in the +Z direction. The upper edge 52b is a substantially horizontal plane facing substantially in the +Z direction. The upper edge 52b abuts against the step 33e of the partition wall 33.

[0052] The upper edge 52b of the peripheral wall 52 and the step 33e of the partition wall 33 may also be partially inclined obliquely relative to the horizontal direction along the edge 32a of the side wall 32 of the upper shell 21. In this case, welding of the upper shell 21, the lower shell 22, and the inner cover 23 becomes easy.

[0053] The outer surface 52c is a substantially elliptical cylindrical curved surface facing the outside of the cylindrical peripheral wall 52. The outer surface 52c is located on the opposite side of the inner surface 52a and abuts against the second inner surface 33d of the partition wall 33. In addition, a gap may be provided between the outer surface 52c and the second inner surface 33d.

[0054] The portion between the second inner surface 33d and the outer surface 33c of the partition wall 33 surrounds the peripheral wall 52. In other words, the partition wall 33 at least partially overlaps with the peripheral wall 52 in the horizontal direction.

[0055] like Figure 4 As shown, the rib 53 is formed in a substantially triangular plate shape, and connects the inclined portion 61 of the bottom wall 51 and the peripheral wall 52. The rib 53 is connected to, for example, a linear portion 66 in the peripheral wall 52. Thus, the rib 53 can suppress the linear portion 66 from falling down. In addition, the rib 53 is not limited to this example.

[0056] like Figure 3As shown, the filter 24 is disposed in the space S. The filter 24 is inserted into the space S from above, for example, in a portion between the side wall 42 and the partition wall 43 of the lower case 22. In addition, the filter 24 is not limited to this example.

[0057] The filter 24 has a filter wall 71 and a peripheral wall 72. The filter wall 71 is arranged to be substantially horizontal. The filter wall 71 is at least partially formed into a mesh shape. The brake fluid can be filtered by the filter wall 71 and pass through the filter wall 71. The peripheral wall 72 extends from the edge of the filter wall 71 in a substantially -Z direction. For example, a protrusion protruding from the peripheral wall 72 is embedded in a cutout provided in the partition wall 43. Thus, the lower housing 22 supports the filter 24.

[0058] The space S includes an inlet chamber Ci, a filter chamber Cf, and a bypass chamber Cb. The inlet chamber Ci is an example of a first compartment. The filter chamber Cf is an example of a third compartment. The bypass chamber Cb is an example of a second compartment.

[0059] The inlet chamber Ci is a part of the space S provided inside the partition wall 33 and the peripheral wall 52. The partition wall 33 and the peripheral wall 52 surround the inlet chamber Ci. The filter chamber Cf and the bypass chamber Cb are parts of the space S provided outside the partition wall 33 and between the side wall 32 and the partition wall 33, respectively.

[0060] The partition wall 33 and the peripheral wall 52 separate the inlet chamber Ci and the filter chamber Cf in the horizontal direction. In addition, the partition wall 33 and the peripheral wall 52 separate the inlet chamber Ci and the bypass chamber Cb in the horizontal direction. One of the plurality of partition walls 34 separates the filter chamber Cf and the bypass chamber Cb in the horizontal direction.

[0061] like Figure 2 As shown, the bottom wall 51 of the inner cover 23 covers the introduction chamber Ci from below. The introduction chamber Ci is formed (divided, defined) by the upper wall 31, the partition wall 33 and the bottom wall 51. In addition, the introduction chamber Ci is not limited to this example. The introduction chamber Ci communicates with the outside of the reservoir 12 via the oil filling port 35.

[0062] The space S further includes a plurality of lower chambers C1. The lower chamber C1 is a portion of the space S provided on the inner side of the lower housing 22. The bottom wall 51 of the inner cover 23 vertically separates the inlet chamber Ci from at least one of the plurality of lower chambers C1. The filter wall 71 of the filter 24 vertically separates the filter chamber Cf from at least one of the plurality of lower chambers C1. In addition, the filter chamber Cf and the lower chamber C1 are connected to each other through the mesh of the filter wall 71. The bypass chamber Cb is connected to at least one of the plurality of lower chambers C1. At least one of the plurality of lower chambers C1 is connected to the outside of the storage tank 12 via the port 48.

[0063] The float 25 is disposed in the lower chamber C1. The float 25 is located between the lower wall 41 and the horizontal portion 62 of the bottom wall 51. The float 25 floats in the brake fluid stored in the reservoir 12. The horizontal portion 62 contacts the float 25 to restrict movement of the float 25 in the +Z direction.

[0064] For example, a magnet is mounted on the float 25. The brake fluid pressure generating device 10 further includes a sensor that detects the vertical position of the float 25 based on the magnetic force of the magnet. The brake fluid pressure generating device 10 can detect the level of the brake fluid stored in the reservoir 12 by detecting the position of the float 25.

[0065] Figure 5 is from Figure 2 A cross-sectional view of a portion of the liquid storage tank 12 of this embodiment is shown on the opposite side of Figure 5 The first gap 81 and Figure 2 The first slit 81 and the second slit 82 are respectively opened at the lower edge 33b of the partition wall 33, and extend from the lower edge 33b substantially in the +Z direction. In addition, the first slit 81 and the second slit 82 may also extend in other directions.

[0066] The first slit 81 and the second slit 82 penetrate the partition wall 33 in a substantially horizontal direction, and open at the first inner surface 33 a , the outer surface 33 c , the second inner surface 33 d , and the step 33 e of the partition wall 33 .

[0067] like Figure 3 As shown, the first slit 81 connects the inlet chamber Ci and the bypass chamber Cb. The rib 53 is located between the first slit 81 and the horizontal portion 62 in the Y direction. The second slit 82 connects the inlet chamber Ci and the filter chamber Cf. The second slit 82 is located between the partition wall 34 that separates the filter chamber Cf and the bypass chamber Cb and the horizontal portion 62 in the Y direction. Further, the rib 53 is located between the second slit 82 and the horizontal portion 62 in the Y direction.

[0068] As described above, the peripheral wall 52 of the inner cover 23 abuts against the second inner surface 33d and the step 33e. Therefore, the peripheral wall 52 blocks the portion of the first slit 81 that opens at the second inner surface 33d and the portion that opens at the step 33e.

[0069] like Figure 2 As shown, at least the edge 81a of the first slit 81 and the upper edge 52b of the peripheral wall 52 form a first hole 85. The first hole 85 is a part of the first slit 81. That is, the peripheral wall 52 forms the first hole 85 by narrowing the first slit 81.

[0070] like Figure 5As shown in FIG. 1 , a second hole 86 is provided in the peripheral wall 52. The second hole 86 penetrates the peripheral wall 52 in a substantially horizontal direction and opens on the inner surface 52a and the outer surface 52c. The second hole 86 is provided at a position adjacent to the bottom wall 51 and is located below the upper edge 52b of the peripheral wall 52. The second hole 86 communicates with a portion of the second slit 82 that opens on the second inner surface 33d. The second hole 86 communicates with the inlet chamber Ci and the filter chamber Cf via the second slit 82.

[0071] The second hole 86 is spaced downward from the upper edge 52b of the peripheral wall 52. Therefore, the portion of the peripheral wall 52 adjacent to the upper edge 52b is not interrupted by the second hole 86 but extends endlessly, thereby suppressing a decrease in strength.

[0072] At least the edge 82a of the second slit 82 and the upper edge 52b of the peripheral wall 52 form a third hole 87. The third hole 87 is a part of the second slit 82. That is, the peripheral wall 52 forms the third hole 87 by narrowing the second slit 82.

[0073] The first hole 85 communicates with the introduction chamber Ci and the bypass chamber Cb, similarly to the first slit 81. The third hole 87 communicates with the introduction chamber Ci and the filter chamber Cf, similarly to the second slit 82.

[0074] The first hole 85 and the third hole 87 are respectively located above the bottom wall 51, and are located above the upper edge 52b of the peripheral wall 52 as the lower end. Furthermore, the first hole 85 and the third hole 87 are respectively located above the lower edge 33b of the partition wall 33. The second hole 86 is located below the first hole 85 and the third hole 87. In addition, instead of the above example, for example, the upper end of the second hole 86 may also extend to the upper edge 52b of the peripheral wall 52. That is, the second hole 86 may also be in the shape of a slit with its upper end released.

[0075] like Figure 4 As shown, the inner cover 23 further has a protrusion 91 that protrudes in a substantially horizontal direction from the outer surface 52c of the peripheral wall 52. The protrusion 91 is embedded in the portion of the second slit 82 that opens at the second inner surface 33d. The protrusion 91 assists in positioning the inner cover 23.

[0076] For example, the brake fluid is supplied to the introduction chamber Ci from the oil filling port 35. The brake fluid in the introduction chamber Ci flows out to the filter chamber Cf through the second hole 86. However, since the first hole 85 and the third hole 87 are located above the upper edge 52b of the peripheral wall 52, the brake fluid usually does not flow out of the first hole 85 and the third hole 87 to the outside of the introduction chamber Ci.

[0077] The brake fluid in the filter chamber Cf is supplied to at least one of the plurality of lower chambers C1 through the filter wall 71. The brake fluid in the lower chamber C1 is supplied from the port 48 to the master cylinder 14, the hydraulic booster 11, or other devices.

[0078] On the other hand, for example, when clogging occurs in the filter 24, the brake fluid in the filter chamber Cf becomes difficult to pass through the filter wall 71. In this case, the brake fluid accumulates in the filter chamber Cf and the introduction chamber Ci, and the liquid level of the brake fluid in the introduction chamber Ci rises.

[0079] When the liquid level of the brake fluid in the introduction chamber Ci rises above the upper edge 52b of the peripheral wall 52, the brake fluid flows out to the bypass chamber Cb through the first hole 85. The brake fluid in the bypass chamber Cb is supplied to the lower chamber C1 without filtering, for example. In this way, even if the mesh of the filter 24 is clogged, the brake fluid in the introduction chamber Ci can be supplied to the lower chamber C1. Therefore, the shortage of brake fluid in the master cylinder 14 and the hydraulic booster 11 is suppressed.

[0080] like Figure 1 As shown, an upper limit scale Mu is provided on the upper housing 21. The upper limit scale Mu is set at substantially the same height as the upper edge 52b of the peripheral wall 52. The user can supply brake fluid to the filling port 35 so that the liquid level of the brake fluid in the introduction chamber Ci does not exceed the upper limit scale Mu, thereby suppressing the supply of unfiltered brake fluid to the lower chamber C1.

[0081] In addition, a lower limit scale M1 is provided on the lower housing 22. When the liquid level of the brake fluid in the space S decreases, the position of the float 25 also decreases. For example, the ECU (Electronic Control Unit) of the vehicle 1 can determine whether the liquid level of the brake fluid in the space S decreases below the lower limit scale M1 based on the detection of the position of the float 25 by a sensor.

[0082] like Figure 3 As shown, a fourth hole 95 may be provided on the partition wall 34 that divides the filter chamber Cf and the bypass chamber Cb. The fourth hole 95 is provided at substantially the same height as the first hole 85, and connects the filter chamber Cf and the bypass chamber Cb. When the filter 24 is clogged, the brake fluid accumulated in the filter chamber Cf can flow out to the bypass chamber Cb through the fourth hole 95.

[0083] In the brake fluid pressure generating device 10 according to the above-described embodiment, the partition wall 33 extends from the upper housing 21 toward the lower housing 22, and separates the introduction chamber Ci and the bypass chamber Cb contained in the space S inside the upper housing 21 and the lower housing 22 that are connected to each other in the horizontal direction. The inner cover 23 has a bottom wall 51 and a peripheral wall 52. The bottom wall 51 covers the introduction chamber Ci from below. The peripheral wall 52 protrudes upward from the bottom wall 51 and abuts against the partition wall 33. The partition wall 33 is provided with a first slit 81 that opens at the lower edge 33b of the partition wall 33 and connects the introduction chamber Ci and the bypass chamber Cb. At least the edge 81a of the first slit 81 and the peripheral wall 52 form a first hole 85 that connects the introduction chamber Ci and the bypass chamber Cb and is located above the bottom wall 51. For example, by changing the length of the peripheral wall 52, the distance between the bottom wall 51 and the first hole 85 in the vertical direction can be easily changed. On the other hand, for example, in the case where a hole connecting the inlet chamber Ci and the bypass chamber Cb is formed by injection molding using a sliding core, the design of the reservoir 12 is limited to provide a portion where the sliding core can move (a moving space of the sliding core). However, the reservoir 12 can form the first hole 85 with a high degree of freedom in arrangement by combining the first slit 81 with the inner cover 23. Therefore, the reservoir 12 can improve the degree of freedom in design. For example, in the case where it is difficult to ensure the moving space of the sliding core, such as when the portion above the upper edge 52b on the outer peripheral side of the peripheral wall 52 in the space S is narrower in the horizontal direction than the portion below the upper edge 52b, the structure of this embodiment is particularly useful.

[0084] The peripheral wall 52 protrudes from the edge of the bottom wall 51 and extends endlessly along the edge of the bottom wall 51, and surrounds the inlet chamber Ci. In other words, the peripheral wall 52 protrudes from substantially the entire circumference of the edge of the bottom wall 51. Thus, the peripheral wall 52 can, for example, suppress the brake fluid present in the inlet chamber Ci from flowing out from an undesired location to the outside of the inlet chamber Ci. Furthermore, the peripheral wall 52 can increase the rigidity of the peripheral wall 52.

[0085] The peripheral wall 52 separates the filter chamber Cf and the inlet chamber Ci contained in the space S in the horizontal direction. The second hole 86 is provided in the peripheral wall 52. The second hole 86 connects the inlet chamber Ci and the filter chamber Cf, and is located at a position lower than the first hole 85. As a result, the brake fluid present in the inlet chamber Ci flows out from the inlet chamber Ci to the filter chamber Cf through the second hole 86. On the other hand, when the liquid level of the brake fluid present in the inlet chamber Ci is higher than the upper edge of the peripheral wall 52, the brake fluid flows out from the inlet chamber Ci to the bypass chamber Cb through the first hole 85. That is, the first hole 85 can discharge the brake fluid from the inlet chamber Ci to the bypass chamber Cb when the liquid level of the brake fluid present in the inlet chamber Ci exceeds a predetermined liquid level. Therefore, the reservoir 12 can suppress the liquid level of the brake fluid in the inlet chamber Ci from exceeding a desired liquid level. Further, for example, the desired liquid level can be easily changed by changing the length of the peripheral wall 52.

[0086] The partition wall 33 partitions the inlet chamber Ci and the filter chamber Cf in the horizontal direction. The partition wall 33 is provided with a second slit 82 which opens at the lower edge 33b of the partition wall 33 and communicates the inlet chamber Ci and the filter chamber Cf. At least the edge 82a of the second slit 82 and the peripheral wall 52 form a third hole 87 which communicates the inlet chamber Ci and the filter chamber Cf. Thus, the liquid storage tank 12 can suppress the size of the hole (the second hole 86 and the third hole 87) which communicates the inlet chamber Ci and the filter chamber Cf from being limited by the length of the peripheral wall 52. In addition, since the third hole 87 is formed by the combination of the second slit 82 and the inner cover 23, the liquid storage tank 12 can improve the degree of freedom in design compared with the case where the hole which communicates the inlet chamber Ci and the filter chamber Cf is formed in the partition wall 33 by injection molding using a sliding core, for example.

[0087] The reservoir tank according to at least one embodiment described above includes, as an example, an upper shell; a lower shell located below the upper shell and coupled to the upper shell; a partition wall extending from the upper shell toward the lower shell and dividing a first compartment and a second compartment in a space inside the upper shell and the lower shell coupled to each other in a horizontal direction; and a partition member including a first wall covering the first compartment from below and a second wall protruding upward from the first wall and abutting against the partition wall, wherein the partition wall is provided with a first slit opening at an edge below the partition wall and connecting the first compartment and the second compartment, and at least the edge of the first slit and the second wall form a first hole connecting the first compartment and the second compartment and located above the first wall. Therefore, as an example, the distance between the first wall and the first hole in the vertical direction can be easily changed by changing the length of the second wall. On the other hand, in the case where the hole connecting the first compartment and the second compartment is formed by injection molding using a sliding core, for example, the design of the reservoir tank is limited to provide a portion where the sliding core can move. However, the liquid storage tank can form the first hole with a high degree of freedom in arrangement by combining the first slit and the partition member. Therefore, the liquid storage tank can improve the degree of freedom in design.

[0088] In the above-mentioned liquid storage tank, as an example, the second wall protrudes from the edge of the first wall and extends endlessly along the edge of the first wall to surround the first compartment. Therefore, as an example, by the second wall protruding from substantially the entire periphery of the edge of the first wall, the second wall can, for example, suppress the liquid present in the first compartment from flowing out of the first compartment from an undesired location. Furthermore, the second wall can increase the rigidity of the second wall.

[0089] In the above-mentioned liquid storage tank, as an example, the second wall separates the third compartment contained in the space from the first compartment in the horizontal direction, and a second hole is provided which connects the first compartment and the third compartment and is located below the first hole. Therefore, as an example, the liquid existing in the first compartment flows out from the first compartment to the third compartment through the second hole. On the other hand, when the liquid level of the liquid existing in the first compartment is higher than the upper edge of the second wall, the liquid flows out from the first compartment to the second compartment through the first hole. That is, the first hole can discharge the liquid from the first compartment to the second compartment when the liquid level of the liquid existing in the first compartment exceeds a prescribed liquid level. Therefore, the liquid storage tank can suppress the liquid level of the liquid in the first compartment from exceeding a desired liquid level. Furthermore, the desired liquid level can be easily changed, for example, by changing the length of the second wall.

[0090] In the above-mentioned liquid storage tank, as an example, the partition wall partitions the first compartment and the third compartment in the horizontal direction, and the partition wall is provided with a second slit that opens at an edge below the partition wall and connects the first compartment and the third compartment, and at least the edge of the second slit and the second wall form a third hole that connects the first compartment and the third compartment. Therefore, as an example, the liquid storage tank can suppress the size of the hole (the second hole and the third hole) connecting the first compartment and the third compartment from being limited by the length of the second wall. In addition, since the third hole is formed by the combination of the second slit and the partition member, the liquid storage tank can improve the degree of freedom in design compared with the case where the hole connecting the first compartment and the third compartment is formed by injection molding using a sliding core, for example.

[0091] The reservoir tank according to at least one embodiment described above includes, as an example, a pressure regulating device capable of pressurizing or depressurizing brake fluid, and the reservoir tank connected to the pressure regulating device and capable of storing the brake fluid. Therefore, as an example, the reservoir tank can improve the degree of freedom in design.

[0092] In the above description, for example, inhibition is defined as preventing an event, action, or influence from occurring, or reducing the extent of an event, action, or influence.

[0093] The above examples illustrate the embodiments of the present invention, but the above embodiments and variations are examples from beginning to end, and are not intended to limit the scope of the invention. The above embodiments and variations can be implemented in various other ways, and various omissions, substitutions, combinations, and changes can be made without departing from the scope of the purpose of the invention. In addition, the structures and shapes of the embodiments and variations can also be partially replaced.

Claims

1. A liquid storage tank, comprising: Upper shell; A lower shell, located below the upper shell and combined with the upper shell; a partition wall extending from the upper case toward the lower case and horizontally partitioning a first compartment and a second compartment contained in a space inside the upper case and the lower case combined with each other; and a partitioning member having a first wall covering the first compartment from below, and a second wall protruding upward from the first wall and abutting against the partition wall, The partition wall is provided with a first gap which is opened at the edge below the partition wall and connects the first compartment and the second compartment. At least an edge of the first slit and the second wall form a first hole that connects the first compartment and the second compartment and is located above the first wall.

2. The liquid storage tank according to claim 1, wherein: The second wall protrudes from an edge of the first wall and extends endlessly along the edge of the first wall, surrounding the first compartment.

3. The liquid storage tank according to claim 2, wherein: The second wall separates a third compartment included in the space from the first compartment in a horizontal direction, and is provided with a second hole that communicates the first compartment with the third compartment and is located below the first hole.

4. The liquid storage tank according to claim 3, wherein: The partition wall separates the first compartment and the third compartment in a horizontal direction. The partition wall is provided with a second gap which is opened at the edge below the partition wall and connects the first compartment and the third compartment. At least an edge of the second slit and the second wall form a third hole connecting the first compartment and the third compartment.

5. A brake hydraulic pressure generating device, comprising: A pressure regulating device capable of increasing or decreasing the pressure of the brake fluid; and The fluid reservoir tank according to any one of claims 1 to 4 is connected to the pressure regulating device and is capable of storing the brake fluid.

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