JPH0726363U - Reservoir - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Effectively absorbs pressure fluctuations in the lower space where the liquid is stored, stores the liquid inside it in a sealed state, and prevents water droplets from mixing into the liquid. Provide a protected reservoir. [Structure] The injection port 2 on the upper part of the reservoir body 1 is closed by a cap 3 via a seal member 10.
The upper space 5 defined by 0 is held open to the atmosphere, and the seal member 10 is formed in a diaphragm shape that is vertically displaced by pressure fluctuations in the lower space 6. A breathing hole 7 is provided on the inner surface of the cap 3 that has a convex portion 10b that can be brought into contact with and separated from the inner surface, and a breathing hole 7 that connects and disconnects the upper space 5 and the lower space 6 is provided above the convex portion 10b. The communication recess 11 that allows the breathing hole 7 to be opened is formed at the abutting position of 1., and the convex portion 10b prevents water droplets formed by dew condensation or the like from flowing into the breathing hole 7 on the upper surface of the seal member 10. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reservoir provided in a vehicle master cylinder or the like.

[0002]

[Prior art]

 A master cylinder used for a vehicle brake or the like is provided with a reservoir for storing brake hydraulic fluid. As shown in FIGS. 8 and 9, this reservoir includes a reservoir body 1 for storing brake fluid, a cap 3 attached to a cylindrical inlet 2 formed in the upper part of the reservoir body 1, and a cap 3 and the reservoir body 1 and a seal member 4 sandwiched between the reservoir body 1 and the reservoir body 1.

The cap 3 has a cylindrical portion 3 a that is fitted onto the inlet 2 and a canopy portion 3 b that closes one end side thereof. Then, the projection 3c protruding inward in the radial direction from the inner surface of the cylindrical portion 3a is engaged with the groove portion 2a formed on the outer surface of the filling port 2, so that the filling port 2 is closed by the canopy portion 3b. It is designed to be attached to the reservoir body 1. The canopy portion 3b is provided with a seal retainer 3d formed concentrically with the cylindrical portion 3a to prevent the seal member 4 from being displaced in the radial direction.

The seal member 4 is a member made of an elastic material such as rubber and formed in a substantially disc shape, and its outer edge portion 4 a is sandwiched between the upper surface 2 b of the inlet 2 and the canopy portion 3 b of the cap 3. By doing so, the sealing property when the injection port 2 is closed by the cap 3 is secured. On the lower surface of the seal member 4, there is formed an annular projection 4b which is brought into contact with the tapered surface 2c formed on the inner edge of the upper end of the inlet 2, and together with the seal retainer 3d of the cap 3, the seal member 4 is formed. It is designed to prevent radial displacement of the. The seal member 4 divides the internal space of the reservoir body 1 into an upper space 5 and a lower space 6.

By the way, in such a reservoir, the brake fluid is moved between a master cylinder (not shown) and a pressure fluctuation is generated inside the lower space 6. Therefore, the seal member 4 forms an annular expansion / contraction portion 4c by folding back the intermediate position in the radial direction over the entire circumference, and is arranged radially inward of the expansion / contraction portion 4c due to the pressure fluctuation. The disk-shaped movable portion 4d is formed in a diaphragm shape that can be displaced in the vertical direction. An atmosphere communicating portion 3e is provided between the cap 3 and the reservoir main body 1 or between the two, and the upper space 5 defined by the seal member 4 is always kept at atmospheric pressure and is movable. The portion 4d can be easily displaced to absorb the pressure fluctuation in the lower space 6.

Further, the seal member 4 has a breathing hole 7 formed at a central position of the movable portion 4d. The breathing hole 7 is formed in a slit shape cut by a cutting tool (not shown) such as a thin cutter, and is normally held in a closed state. Further, when the movable portion 4d is displaced, for example, when a pressure fluctuation that further displaces the movable portion 4d in the upper limit direction or the lower limit direction occurs, the movable portion 4d is elastically deformed and the upper space 5 and The breathing hole 7 opens due to the pressure difference in the lower space 6, so that the upper space 5 and the lower space 6 communicate with each other. As a result, air circulates through the breathing hole 7 from the upper space 5 to the lower space 6 or from the lower space 6 to the upper space 5 to absorb pressure fluctuations in the lower space 6, 6 The pressure inside is kept constant.

[0007]

[Problems to be solved by the device]

 By the way, in such a reservoir, the temperature of the outside air may be lowered to cause dew condensation on the inner surface of the cap 3, and the water droplet W may adhere to the surface of the seal member 4. At normal times, since the breathing hole 7 is closed, the water droplet W is stored in the upper space 5 as shown in FIG. 8 and vaporizes or flows out from the atmosphere communicating portion 3e to the outside. Will be gradually reduced by. However, as shown in FIG. 9, when a pressure fluctuation occurs in the lower space 6, for example, when a large amount of the brake hydraulic fluid flows from the reservoir body 1 to the master cylinder and the lower space 6 becomes a negative pressure state. As described above, the movable portion 4d of the diaphragm-shaped seal member 4 is lowered, and the central portion of the movable portion 4d is deformed into a concave shape that is recessed downward. Will be collected in the central position of. Moreover, when the negative pressure state of the lower space 6 further increases, the breathing hole 7 provided at the central position of the movable portion 4d is opened, and air is sucked into the lower space 6 from the upper space 5, so that this air In both cases, there is a problem that the water droplet W is drawn into the lower space 6 and added / mixed in the brake hydraulic fluid stored in the lower space 6.

The present invention has been made in view of the above circumstances, and effectively absorbs the pressure fluctuation of the lower space in which the liquid is stored, and stores the liquid inside thereof in a sealed state. It is an object of the present invention to provide a reservoir that prevents water droplets W from being mixed with liquid.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention proposes the following two means. The first means comprises a reservoir body for storing a liquid and a cap for closing an injection port formed in the upper portion of the reservoir body, and the reservoir is provided by a seal member interposed between the cap and the reservoir body. A reservoir formed by partitioning the inside of the main body between an upper space and a lower space, wherein the upper space is held in an atmosphere open state by an atmosphere communicating portion provided in the cap or the reservoir body, and the seal member has an outer edge thereof. The part is sandwiched between the reservoir body and the cap, and is formed in a diaphragm shape that is displaced in the vertical direction due to fluctuations in the internal pressure of the lower space, and is formed so as to project upward in the central part. In addition, there is a convex portion that is brought into contact with and separated from the inner surface of the cap by the displacement of the seal member, and the displacement of the seal member is provided above the convex portion. A breathing hole is provided that communicates the upper space and the lower space with each other, and is opened on the inner surface of the cap at a contact position near the breathing hole of the convex portion that is brought into contact with the inner surface. The second means proposes a reservoir in which a communication recess for holding the upper space and the lower space in a communication state is formed by a breathing hole formed therein, and the second means is a reservoir main body and an upper part of the reservoir main body. A reservoir for closing an injection port formed in the reservoir, the reservoir body being partitioned between an upper space and a lower space by a seal member interposed between the cap and the reservoir body. The upper space is held open to the atmosphere by an atmosphere communicating portion provided in the cap or the reservoir body, and the seal member has an outer edge portion thereof which is connected to the reservoir body and the cap. It is sandwiched between the upper space and the lower space and is formed into a diaphragm shape that is vertically displaced by the fluctuation of the internal pressure of the lower space, and is opened at the center by the displacement of the seal member. A breathing hole communicating with the breathing hole, and provided around the breathing hole is a cylindrical partition wall that is formed in a protruding state and that is brought into contact with and separated from the inner surface of the cap by the displacement of the seal member. A reservoir has been proposed in which a communication part is formed between the cap and the cap for keeping the inside of the upper space defined by the partition in contact with the inner surface of the cap when the partition is in contact with the cap.

[0010]

[Action]

 According to the reservoir according to the first means, when the lower space for storing the liquid is in a high pressure state and the displacement of the diaphragm-shaped seal member reaches the upper end, it is formed in the center of the seal member. The convex portion is brought into contact with the inner surface of the cap, and the breathing hole is opened at the corresponding contact position. Since the communication recessed portion arranged near the breathing hole is formed on the inner surface of the cap, the opening of the breathing hole is not obstructed by the inner surface of the cap even when the protrusion is in contact with the inner surface of the cap. Pressure fluctuations in the lower space are absorbed. Since the breathing hole is formed on the upper part of the convex portion that is formed to project upward, the liquid stored in the lower space is unlikely to adhere to the vicinity of the breathing hole, and the liquid does not reach the upper part through the breathing hole. Ejection into the space is avoided. Further, even if the breathing hole is opened when the seal member is located at the lower end of the displacement range, it is possible to prevent water droplets generated by dew condensation in the upper space from dripping into the lower space. Also, according to the reservoir according to the second means, when the lower space for storing the liquid is in a high pressure state and the displacement of the diaphragm-shaped seal member reaches the upper end, The upper end of the formed partition wall is brought into contact with the inner surface of the cap, and the breathing hole is opened at the contact position. Since a communication part is provided between the partition wall and the cap, the upper space defined by abutment is in communication, the opening of the breathing hole is not blocked, and pressure fluctuations in the lower space are absorbed. To be done. Since the partition wall is formed so as to surround the periphery of the breathing hole, even if the liquid stored in the lower space is jetted to the upper space, it is stored in the partition wall, so that the sealing member Due to the opening of the breathing hole at the lower end position of the displacement, it is flowed back to the lower space again, and the outflow to the outside of the reservoir is prevented. Further, even if the breathing hole is opened when the seal member is located at the lower end of the displacement range, the partition wall prevents the water droplets generated by dew condensation in the upper space from flowing into the breathing hole, and the lower part of the water droplet This will prevent dripping into the space.

[0011]

【Example】

 Hereinafter, an embodiment of a reservoir according to the present invention will be described with reference to FIGS. 1 to 4. In the present embodiment, the portions having the same configuration as the conventional example shown in FIGS. 8 and 9 are designated by the same reference numerals to simplify the description.

The reservoir of this embodiment is also provided in a vehicle master cylinder or the like. As shown in FIGS. 1 and 2, the reservoir main body 1 for storing the brake hydraulic fluid therein and the reservoir main body 1 formed above the reservoir main body 1 are formed. 8 and FIG. 8 in that it has a cap 3 attached to the filled cylindrical injection port 2 and a seal member 10 sandwiched between the cap 3 and the upper end surface 2b of the injection port 2. This is common to the conventional example shown in FIG. However, the reservoir of this embodiment is different from the conventional reservoir in the shape of the seal member 10.

The seal member 10 used in the reservoir of this embodiment has a truncated cone-shaped convex portion 10b at the center of the movable portion 10a. The convex portion 10b is also thinly formed like the other portions of the seal member 10. As shown in FIG. 3, a slit-like breathing hole 7 is formed in a flat portion 10c arranged on the upper portion thereof. There is. Further, an annular recess 10d is formed around the breathing hole 7 to further reduce the thickness of the flat portion 10c, and the vicinity of the breathing hole 7 is provided for the movable portion 10a reinforced by the protrusion 10b. It is designed so that the breathing hole 7 can be easily opened and closed by giving flexibility to the chisel.

In this seal member 10, when a pressure rise occurs in the lower space 6 of the reservoir body 1 and the movable portion 10a is displaced upward as shown in FIG. 1, the flat portion 10c of the convex portion 10b is moved. Is brought into close contact with the inner surface of the cap 3 arranged above it. Here, if a further pressure increase occurs at the relevant contact position, the breathing hole 7 formed in the flat portion 10c is opened to allow the air in the lower space 6 to escape to the upper space 5 to reduce the pressure increase. From the necessity, as shown in FIG. 3, a communication recess 11 is formed on the inner surface of the cap 3 and is linearly cut out along the breathing hole 7. The communicating recess 11 is formed longer than the diameter of the flat portion 10c so that the lower space 6 can be opened to the atmosphere while the breathing hole 7 is opened, as shown in FIG. Has become.

A case will be described below in which water droplets W are generated in the upper space 5 due to dew condensation in the reservoir configured as described above. When the lower space 6 is in a negative pressure state with water droplets W attached to the upper surface of the seal member 10, as shown in FIG. 2, the movable portion 10a is lowered and the concave shape is depressed toward the center. The water droplet W is collected in the central direction. However, since the convex portion 10b is provided at the central position of the movable portion 10a, the water droplet W is collected at the base of the convex portion 10b, and the breathing hole 7 formed on the upper portion of the convex portion 10b is opened. However, it is possible to avoid dropping from the breathing hole 7 into the lower space 6.

In addition, the liquid level of the brake hydraulic fluid in the reservoir body 1 may oscillate and jump up to adhere to the lower surface of the seal member 10. Even in this case, the breathing hole 7 has a convex portion. Since it is formed on the upper portion of 10b, it is less attached due to splashing, and the ejection of the brake hydraulic fluid from the breathing hole 7 is reduced.

Therefore, according to the reservoir of the present embodiment, the convex portion 10b formed on the seal member 10 prevents the water droplet W from being dropped into the brake hydraulic fluid due to dew condensation. It is possible to prevent problems such as deterioration of braking performance due to the mixing of water. Further, since the amount of the brake hydraulic fluid ejected from the breathing hole 7 is reduced, the leakage of the brake hydraulic fluid from the atmosphere communicating portion 3e of the cap is reduced, and the leakage of the brake hydraulic fluid from other piping systems is prevented. It is possible to avoid the erroneous recognition of and reduce the man-hours required for the confirmation work.

Next, a second embodiment of the reservoir according to the present invention will be described with reference to FIGS. The reservoir of this embodiment is also different in the seal member 20 from the above-described first embodiment and conventional example.

The seal member 20 used in the reservoir of the present embodiment has a cylindrical partition wall 20b formed on the upper surface of the movable portion 20a so as to stand upright. The movable portion 20a arranged inside the partition wall 20b is provided with a slit-shaped breathing hole 7, and the breathing hole 7 is surrounded by a breathing hole 7 as shown in FIG. An annular recess 20c is formed to facilitate opening and closing of the hole 7.

In the partition wall 20b, when a pressure rise occurs in the lower space 6 of the reservoir body 1 and the movable portion 20a is displaced upward as shown in FIG. 5, the upper end surface 20d of the movable portion 20a is moved upward. The cap 3 is arranged so as to be in close contact with the inner surface of the cap 3. Here, if a further pressure increase occurs at the corresponding contact position, it is necessary to open the breathing hole 7 formed in the movable portion 20a to allow the air in the lower space 6 to escape to the upper space 5 to reduce the pressure increase. In view of the characteristics, as shown in FIG. 7, a part of the upper end surface 20d of the partition wall 20b is cut out to form the communication portion 21. When the partition wall 20b is brought into contact with the inner surface of the cap 3, the communicating portion 21 holds the spaces defined by the partition wall 20b inside and outside the partition wall 20b so as to communicate with each other. Thereby, when the breathing hole 7 is opened at the corresponding contact position, the lower space 6 can be opened to the atmosphere.

A case where water droplets W are generated in the upper space 5 due to dew condensation in the thus-configured reservoir will be described below. When the inside of the lower space 6 is in a negative pressure state with the water droplets W attached to the upper surface of the seal member 20, the movable portion 20a is lowered and the concave shape is depressed toward the center as shown in FIG. The water droplet W is collected in the central direction. However, since the cylindrical partition wall 20b surrounding the breathing hole 7 is provided around the breathing hole 7 formed at the central position of the movable portion 20a, the water droplet W flows into the breathing hole by the partition wall 20b. Even if the breathing hole 7 is opened due to the blockage, the water is stored in the upper space 5 without dripping into the lower space 6.

In addition, when the liquid level of the brake hydraulic fluid in the reservoir body 1 swings and jumps up and adheres to the lower surface of the seal member 20, the lower space 6 becomes a high pressure state so that the breathing hole 7 opens. Then, the brake operating fluid attached to the lower surface of the seal member 20 may be ejected from the breathing hole 7 to the upper space 6. However, since the periphery of the breathing hole 7 is surrounded by the partition wall 20b, the brake hydraulic fluid is stored in the partition wall 20b and flows back to the lower space 6 from the breathing hole 7 opened at the time of negative pressure. Become .

Therefore, according to the reservoir of the present embodiment, the partition wall 20b formed in the seal member 20 prevents the water droplet W from being dropped into the brake hydraulic fluid due to dew condensation. Similarly, it is possible to prevent the occurrence of troubles such as deterioration of braking performance due to the mixing of water in the brake hydraulic fluid. Further, the brake hydraulic fluid ejected from the breathing hole 7 to the upper space 6 is stored in the partition wall 20b, and when the lower space 6 is in a low pressure state, it is drawn back into the lower space 6 by the opening of the breathing hole 7. Therefore, it is possible to prevent the brake hydraulic fluid from leaking from the inlet 2 of the reservoir, avoid misidentification as a leak of the brake hydraulic fluid from another piping system, etc., and reduce the number of man-hours required for the confirmation work. be able to.

<Other Embodiments> The following technique can be adopted in the reservoir according to the present invention. In the first embodiment, the convex portion 10b formed on the movable portion 10a has a truncated cone shape, but instead of this, it may have another arbitrary shape, such as a cylindrical shape or a box shape. In the second embodiment, the partition wall 20b formed on the movable portion 20a has a cylindrical shape. However, instead of this, the partition wall 20b may have another arbitrary cylindrical shape. In the second embodiment, the communication portion 21 that communicates the inside and outside of the partition wall 20b is formed by cutting out the upper end surface 20d of the partition wall 20b. To form.

[0025]

[Effect of device]

 As described in detail above, the first means, that is, the reservoir according to the invention of claim 1 is such that the inlet of the upper part of the reservoir main body is closed by a cap via a seal member, and is partitioned by the seal member. The upper space is kept open to the atmosphere, and the sealing member is formed in the shape of a diaphragm that can be displaced vertically due to pressure fluctuations in the lower space. The upper part of the projection has a breathing hole that connects and blocks the upper space and the lower space, and the inner surface of the cap has a communication recess that allows the breathing hole to be opened at the contact position of the projection. Since it is formed, it has the following effects. Since the water droplets generated in the upper space due to dew condensation are prevented from dropping from the breathing hole to the lower space, the liquid stored inside the reservoir body can be kept in a healthy state. Since the convex portion reinforces the periphery of the breathing hole of the movable portion, cutting of the breathing hole can be facilitated. Since the breathing hole is formed in the upper part of the convex portion, the adhesion of the liquid inside the reservoir main body to the vicinity of the breathing hole is reduced, and the liquid is prevented from flowing out from the breathing hole to the upper space and further to the outside of the reservoir. Can be prevented. Further, the second means, that is, the reservoir according to the invention of claim 2, is such that the inlet of the upper part of the reservoir main body is closed by a cap with a seal member, and the upper space partitioned and formed by the seal member is It is kept open to the atmosphere, and the seal member is formed in the shape of a diaphragm that can be displaced vertically due to pressure fluctuations in the lower space, and has a breathing hole in the center that connects and blocks the upper space and the lower space. In addition, since a cylindrical partition wall that is brought into contact with and separated from the inner surface of the cap is provided around the breathing hole, and a communication part that communicates the space inside and outside the partition wall is formed between the partition wall and the cap. Produces the effect of. Water droplets generated in the upper space due to dew condensation are prevented from dripping from the breathing hole to the lower space, so that the liquid stored in the reservoir body can be kept in a healthy state. Since the partition wall reinforces the periphery of the breathing hole of the movable portion, cutting of the breathing hole can be facilitated. Since the breathing hole is formed inside the septum, even if the liquid inside the reservoir body squirts from the breathing hole to the upper space, the liquid is retained in the septum and when the breathing hole is opened. It can be flowed back to the lower space and can be prevented from flowing out of the reservoir.

[Brief description of drawings]

1 shows a first embodiment of a reservoir according to the present invention,
It is a longitudinal cross-sectional view showing a state in which the internal pressure of the lower space is close to the atmospheric pressure.

FIG. 2 is a vertical cross-sectional view showing a state where the internal pressure of the lower space becomes negative pressure in the reservoir of FIG.

FIG. 3 is a vertical sectional view showing a convex portion of a seal member of the reservoir of FIG.

4 is a vertical cross-sectional view showing a communication recess of the reservoir of FIG.

FIG. 5 shows a second embodiment of the reservoir according to the present invention,
It is a longitudinal cross-sectional view showing a state in which the internal pressure of the lower space is close to the atmospheric pressure.

FIG. 6 is a vertical cross-sectional view showing a state where the internal pressure of the lower space becomes negative in the reservoir of FIG.

7 is a vertical cross-sectional view showing a partition wall of the seal member of the reservoir of FIG.

FIG. 8 is a vertical cross-sectional view showing a state where the internal pressure of the lower space is close to the atmospheric pressure in the conventional example of the reservoir.

9 is a vertical cross-sectional view showing a state where the internal pressure of the lower space becomes negative pressure in the reservoir of FIG.

[Explanation of symbols]

 1 Reservoir main body 2 Injection port 3 Cap 3e Atmosphere communication part 5 Upper space 6 Lower space 7 Breathing hole 10/20 Seal member 10b Convex part 11 Communication recessed part 20b Partition wall 21 Communication part

Claims (2)

[Scope of utility model registration request] 1. A reservoir main body comprising a reservoir main body for storing a liquid, and a cap for closing an injection port formed in the upper portion of the reservoir main body, the reservoir main body being provided with a seal member interposed between the cap and the reservoir main body. A reservoir having an inner space partitioned into an upper space and a lower space, wherein the upper space is held in an atmosphere open state by an atmosphere communicating portion provided in a cap or a reservoir body, and the seal member has an outer edge portion thereof. It is sandwiched between the reservoir body and the cap, and is formed in a diaphragm shape that is displaced in the vertical direction by fluctuations in the internal pressure of the lower space, and is formed in the central portion so as to project upward, and a seal. The cap has a convex portion that is brought into contact with and separated from the inner surface of the cap by the displacement of the member. A breathing hole that is opened to communicate the upper space and the lower space is provided, and an inner surface of the cap is opened at a contact position in the vicinity of the breathing hole of the convex portion that is brought into contact with the inner surface. A reservoir characterized in that a communication recess that holds the upper space and the lower space in communication with each other is formed by the breathing hole formed therein. 2. A reservoir main body comprising a reservoir main body for storing a liquid and a cap for closing an injection port formed in the upper portion of the reservoir main body, and a reservoir main body provided by a seal member interposed between the cap and the reservoir main body. A reservoir having an inner space partitioned into an upper space and a lower space, wherein the upper space is held in an atmosphere open state by an atmosphere communicating portion provided in a cap or a reservoir body, and the seal member has an outer edge portion thereof. The upper space is sandwiched between the reservoir body and the cap and is formed in a diaphragm shape that is vertically displaced by fluctuations in the internal pressure of the lower space, and is opened at the center by displacement of a seal member. Has a breathing hole that communicates with the lower space, and the displacement of the seal member formed in a protruding state upward around the breathing hole. A cylindrical partition wall that is brought into contact with and separated from the inner surface of the cap is provided, and between the partition wall and the cap, the inside of the upper space that is partitioned by the partition wall when the partition wall contacts the inner surface of the cap is maintained in a communicating state. A reservoir having a communication part formed therein.