JP2000304001A - Cap for reservoir - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap for a reservoir without outside leakage of working oil even in the case when a working oil level inclined by braking operation further rises by releasing of the braking operation. SOLUTION: An air chamber 69 is divided into a first air chamber 69a and a second air chamber 69b by integrally assembling a partition member 101 having a communicating hole 103 provided on a bag type rise part 102 into a hollow stepped cylinder 81 having a groove positioned in the longitudinal direction of a vehicle on an outer peripheral part 81a and fitting an assembly body in an opening part 72a of a hollow cylinder 72 forming a part of a cap main body 61, and the first air chamber 69a and an inside 51b of a reservoir are communicated to each other by an auxiliary supply and exhaust air hole 67 formed of a groove 81c and a hollow cylinder inner peripheral surface 72b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reservoir cap for storing hydraulic fluid for hydraulic equipment such as a master cylinder.

[0002]

2. Description of the Related Art This type of reservoir is disclosed in, for example, FIGS.
0, a cap main body 2 attached to a fuel supply port cylinder 1 of a reservoir R, as shown in Japanese Utility Model Laid-Open Publication No. 6-37040,
A ventilation passage body 3 which is fitted in a mounting cylinder 6 formed so as to protrude into the refueling port cylinder 1 and defines an expansion chamber 7 in the mounting cylinder 6. In a reservoir cap having a ventilation hole 8 communicating with the expansion chamber 7 and a vertical hole 13 communicating the reservoir R with the expansion chamber 7 in the ventilation path body 3, the expansion chamber 7 is defined in the mounting cylinder 6 of the cap body 2. A body portion 11 having an end wall 10 to be fitted and fitted into the mounting cylinder 6;
An air passage comprising a ventilation tube 12 hanging from the lower surface of the end wall 10 and a barrier portion 14 protruding from the end wall 10 so as to cover an upper opening end of a vertical hole 13 penetrating the ventilation tube 12 and the end wall 10. The body 3 is integrally molded, and the barrier portion 14 has
A lateral hole 16 is provided extending from the vertical hole 13 in the lateral direction and opening to the expansion chamber 7.

[0003] The above-mentioned prior art has an advantage that the working fluid can be prevented from leaking outside when the working fluid in the reservoir rises with a small number of parts.

[0004]

However, in the prior art configuration, when braking on a slope or sudden braking on a flat road, the hydraulic fluid surface is inclined and the vertical hole of the ventilation cylinder is closed by the hydraulic fluid. When the braking operation is released in the state in which the hydraulic fluid is in the state, the hydraulic fluid returns from the master cylinder to the reservoir, and the inclined hydraulic fluid level further rises. At this time, since the vertical hole of the ventilation cylinder is narrow and the vertical hole is closed with hydraulic fluid, the part where the air inside the reservoir exists is closed and pressure is applied to the hydraulic fluid, and a slight liquid level Even when the hydraulic fluid rises, there is a possibility that the hydraulic fluid rapidly enters the expansion chamber through the vertical hole and leaks into the atmosphere through the vent hole.

[0005] The above-described leakage of the hydraulic fluid to the outside can be prevented by increasing the height of the oil supply port cylinder so as to allow a sufficient distance between the oil level and the vertical hole. However, with the recent improvement in vehicle performance, the number of devices installed in the engine room has increased significantly, leaving room for mounting space. Can not be installed in the engine room.

The present invention provides a reservoir cap which prevents the hydraulic fluid from leaking to the outside even when the level of the hydraulic fluid tilted by braking on a sloping road or sudden braking on a flat road is further increased by releasing the braking operation. It is an object of the present invention to provide at low cost without any problem.

[0007]

According to the first aspect of the present invention, there is provided a cap body mounted on a working fluid inlet cylinder of a reservoir;
An air cylinder that forms a part of the cap body and has an air chamber, a vent hole at an upper end side of the air cylinder that communicates the air chamber with the atmosphere, and a vent hole at a lower end side of the air cylinder. A main supply / exhaust hole communicating the air chamber with the interior of the reservoir; and an auxiliary supply / exhaust hole provided in the air cylinder and communicating the air chamber with the interior of the reservoir. Located on the reservoir cap.

The most remarkable point of the invention according to the first aspect is that a main air supply / exhaust hole is provided for communicating an air chamber in which air exists in a normal state with the inside of the reservoir, and the air chamber and the inside of the reservoir are connected. That is, an auxiliary air supply / exhaust hole for communication is provided.

According to the above configuration, the hydraulic fluid level in the reservoir is tilted during braking on a sloping road or sudden braking on a flat road, and the main supply / exhaust hole is closed by the hydraulic fluid (usually conceivable). In consideration of the maximum deceleration during sudden braking and the maximum inclination angle of the slope, at worst, only the main supply and exhaust holes are designed to be closed by hydraulic fluid), and the auxiliary supply and exhaust holes are opened inside the reservoir. Section is provided so as not to be blocked by the raised liquid level, so that the part where the air inside the reservoir exists and the air chamber, and eventually the part where the air inside the reservoir exists and the atmosphere communicate with each other and the inside of the reservoir A portion where air exists is not sealed. Therefore, even if the braking operation is released and the hydraulic fluid recirculates from the master cylinder and the inclined liquid level rises, the air inside the reservoir is only discharged to the atmosphere through the auxiliary air supply / exhaust holes, Hydraulic fluid does not suddenly flow into the air chamber from the supply / exhaust port,
External leakage of hydraulic fluid is prevented.

[0010] Next, as in the invention according to claim 2, the air cylinder includes a hollow cylinder formed in a part of the cap body and having an opening opening inside the reservoir.
It is preferable that the cap body is formed from a hollow stepped cylinder which is separately fitted into the opening. As a result, the air cylinder has a divided structure and has a simple shape, so that molding is easy and cost reduction is achieved. Also,
Even if the shape of the cap changes depending on the model,
The hollow stepped cylinder may have a common shape, and only the cap body may be arranged for each vehicle type, thereby reducing costs.

[0011] Next, the auxiliary air supply / exhaust hole is formed in the outer peripheral portion of the hollow stepped cylinder so as to communicate the air chamber and the inside of the reservoir. Preferably, the groove is formed by the groove and the inner peripheral surface of the hollow cylinder. Thereby, since the groove can be formed at the same time when the main body of the hollow stepped cylinder is formed of resin or the like, the auxiliary air supply / exhaust hole can be provided without increasing the cost.

Next, as in the invention according to claim 4, the auxiliary air supply / exhaust hole is provided on an outer peripheral portion of the hollow stepped cylinder and on an inner peripheral surface of the hollow cylinder, and is provided between the air chamber and the reservoir. It is preferably formed by a groove formed so as to communicate with the inside. Thereby, since the groove can be formed at the same time when the cap body is formed of rubber or the like, the auxiliary air supply / exhaust hole can be provided without increasing the cost.

Next, it is preferable that the auxiliary air supply / exhaust hole is a hole formed at a step bottom of the hollow stepped cylinder. Thereby, since the hole can be formed simultaneously with the molding of the cap body with rubber or the like, the auxiliary air supply / exhaust hole can be provided without increasing the cost.

[0014] Next, as in the invention according to claim 6, the air chamber is divided into a first air chamber having a ventilation hole and a main air supply / exhaust hole by a partition member provided with a communication hole. 2
It is preferable that the communication hole is divided into an air chamber, and the communication hole is a hole formed in a side surface of a bag-like protruding portion protruding from the partition member. Accordingly, even when the working fluid flows into the second air chamber through the main supply / exhaust hole in a jet-like manner due to the waving of the working fluid level and further attempts to flow into the first air chamber, the communication hole is raised from the partition member. Since the hole is formed in the side surface of the bag-shaped ridge, the ridge serves as a barrier to prevent the jet from flowing into the first air chamber. Further, even when the hydraulic fluid flows into the first air chamber, the hydraulic fluid can easily return to the reservoir through the hole formed in the side surface and the main air supply / exhaust hole, and the hydraulic fluid can stay in the air chamber. Absent.

Next, it is preferable that the partition member is an assembly fitted to the hollow stepped cylinder and integrated with the hollow stepped cylinder. As a result, the partition member and the hollow stepped cylinder are integrated as an assembly, and this assembly can be separately assembled to the cap body, so that assembling workability is improved and the shape of the cap varies depending on the vehicle type. Even in such a case, the assembly may have a common shape, and only the cap body may be arranged for each vehicle type, so that the cost can be reduced.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a first embodiment.

In FIG. 1, reference numeral 51 denotes a reservoir, 51a denotes a working fluid inlet cylinder of the reservoir, and 61 denotes a cap body. An air cylinder 62 having an air chamber 69 is formed in a part of the cap main body 61.
A is provided with a vent hole 64 for communicating the air chamber 69 with the atmosphere. In addition, on the lower end side 62b of the air cylinder 62,
A main supply / exhaust hole 66 is provided for communicating the air chamber 69 with the interior 51b of the reservoir. Therefore, the interior 51b of the reservoir is communicated with the atmosphere by the main supply / exhaust holes 66 and the ventilation holes 64. Further, the air cylinder 62 is provided with an auxiliary air supply / exhaust hole 67 that communicates the air chamber 69 with the interior 51b of the reservoir. The upper end 62 of the air cylinder 62
A cover 68 is attached to the upper part of a in order to prevent the rainwater or muddy water from entering the ventilation hole 64.

Normally, when the hydraulic fluid level undulates due to the vertical movement of the running vehicle, the hydraulic fluid is prevented from flowing into the air chamber 69 due to the jumping up at the lower end 62b of the air cylinder 62, and the main supply / exhaust air is exhausted. Since the hole 66 has a small diameter and a predetermined length, the working fluid is prevented from flowing into the air chamber 69 from the main supply / exhaust hole 66 in combination with the surface tension effect of the working fluid. Further, even when the hydraulic fluid flows into the air chamber 69, the interior 51 b of the reservoir is
, The hydraulic fluid does not stay in the air chamber 69.

Also, when braking on a slope or sudden braking on a flat road, the hydraulic fluid level in the reservoir 51 tilts (surface A in FIG. 1).
Further, when the braking operation is released, the hydraulic fluid is recirculated from the master cylinder (not shown) and the inclined liquid level rises by H (H and B surfaces in FIG. 1), and the main supply / exhaust holes 66 are filled with the hydraulic fluid. May be blocked. However, since the opening 67a of the auxiliary air supply / exhaust hole 67 to the inside 51b of the reservoir is provided so as to be located in the front-rear direction of the vehicle so as not to be blocked by the raised liquid level, air in the inside 51b of the reservoir exists. The air chamber 69 communicates with the air chamber 69, and thus the air inside the reservoir 51b and the air, and the air inside the reservoir 51b is released to the atmosphere through the auxiliary air supply / exhaust holes 67 and the air holes 64. Therefore, the portion of the reservoir inside 51b where air exists does not become a sealed state. Therefore, the air pressure in the reservoir interior 51b does not become higher than the atmospheric pressure, the hydraulic fluid level is pushed by the air pressure in the reservoir interior 51b, and the hydraulic fluid rapidly flows from the main supply / exhaust hole 66 into the air chamber 69. As a result, external leakage of the hydraulic fluid is prevented.

FIG. 2 shows a second embodiment, which corresponds to claims 2 and 3.

In the configuration of the second embodiment, the air cylinder 62 is formed by a hollow cylinder 72 having an opening 72a on the inside 51b side of the reservoir, and a hollow stepped cylinder 81 separate from the cap body 61. Things. Further, a groove 81c is formed in the outer peripheral portion 81a of the hollow stepped cylinder 81 so as to communicate the air chamber 69 and the inside 51b of the reservoir, and the groove 81c and the inner peripheral surface 72b of the hollow cylinder 72 form a vehicle. An auxiliary air supply / exhaust hole 67 is formed so as to be located in the front-back direction. Thereby, since the air cylinder 62 has a divided structure and has a simple shape, molding is facilitated and cost reduction is achieved. Further, since the groove 81c can be formed at the same time when the main body of the hollow stepped cylinder 81 is formed, the auxiliary air supply / exhaust hole 67 can be provided without increasing the cost.

FIG. 3 shows a third embodiment, which corresponds to claim 4.

The structure of the third embodiment comprises a groove 72c provided on the inner peripheral surface 72b of the hollow cylinder 72 and a hollow stepped cylinder 81
An auxiliary air supply / exhaust hole 67 is formed in the vehicle front-rear direction by the outer peripheral portion 81a of the vehicle. Thereby, the groove 72c can be formed at the same time when the cap main body 61 is formed of rubber or the like, so that the auxiliary supply / exhaust hole 67 can be provided without increasing the cost.

FIG. 4 shows a fourth embodiment, which corresponds to claim 5.

The structure of the fourth embodiment is a hollow stepped cylinder 8
A hole 91 is provided at a position in the vehicle front-rear direction of the first step bottom portion 81b to form an auxiliary supply / exhaust hole 67. This allows
Since the hole 91 can be formed at the same time when the main body of the hollow stepped cylinder 81 is formed, the auxiliary supply / exhaust hole 67 can be formed without increasing the cost.
Can be provided.

FIGS. 5 to 8 show a fifth embodiment, which corresponds to claims 6 and 7. FIG.

In the configuration of the fifth embodiment, the air chamber 69 is
The first air chamber 69a and the second air chamber 69b are divided by a partition member 101 having a communication hole 103, and as shown in FIG.
An assembly 100 in which the cylinder 01 and the hollow stepped cylinder 81 are integrally assembled by press fitting or the like may be used. The communication hole 103 is a hole formed in the side surface of the bag-shaped protruding portion 102 protruding from the partition member 101, and the flow of the hydraulic fluid causes the jet-like hydraulic fluid to flow into the first air chamber 69a. Also, the raised portion 102 serves as a barrier to prevent the inflow. Further, even if the hydraulic fluid flows into the first air chamber 69a, the hydraulic fluid can easily return to the reservoir through the communication hole 103 and the main supply / exhaust hole 66, and the first air chamber 69a
There is no stagnation.

[0029]

According to the first to fifth aspects of the present invention, the hydraulic fluid surface tilted during braking on a sloping road or sudden braking on a flat road,
It is possible to provide a low-cost reservoir cap in which the hydraulic fluid does not leak to the outside even when the brake fluid further rises due to the release of the braking operation.

According to the sixth and seventh aspects of the present invention, in addition to the effects of the first to fifth aspects, when the hydraulic fluid level undulates due to the vertical movement of the running vehicle. In addition, the hydraulic fluid jumps into the air chamber due to
As a result, it is possible to effectively prevent external leakage of the working fluid.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a sectional view showing a fifth embodiment of the present invention.

FIG. 6 is an assembled sectional view of a partition member and a hollow stepped cylinder according to a fifth embodiment of the present invention.

FIG. 7 is a sectional view of a partition member according to a fifth embodiment of the present invention.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a sectional view showing a conventional technique.

FIG. 10 is a sectional view showing details of a conventional reservoir cap.

[Explanation of symbols]

 51 Reservoir 51a Hydraulic Fluid Injector Tube 51b Inside Reservoir 61 Cap Main Body 62 Air Tube 62a Upper End Side of Air Tube 62b Lower End Side of Air Cylinder 64 Vent 66 Main Supply / Exhaust Hole 67 Auxiliary Supply / Exhaust Hole 69 Air Chamber 69a First Air Chamber 69b Second air chamber 72 Hollow cylinder 72a Opening of hollow cylinder 72b Inner peripheral surface of hollow cylinder 72c Groove 81 Hollow stepped cylinder 81a Outer peripheral part of hollow stepped cylinder 81b Step bottom of hollow stepped cylinder 81c Groove 91 Hole 100 Assembly Body 101 Partition member 102 Bag-shaped raised portion 103 Communication hole

Continued on the front page F term (reference) 3D047 BB03 BB28 3E084 AA05 AA12 AB01 BA03 CA01 DA01 DB13 FA09 FC07 GA08 GB12 KA01 3H086 AA14 AE02 AE28

Claims (7)

[Claims] 1. A cap body mounted on a working fluid inlet cylinder of a reservoir, an air cylinder forming a part of the cap body and having an air chamber, and an air chamber at an upper end side of the air cylinder. A vent that communicates with the atmosphere, a main supply / exhaust hole at the lower end of the air cylinder that communicates with the air chamber and the interior of the reservoir, and an air chamber and the reservoir that are provided in the air cylinder. And a supplementary air supply / exhaust hole communicating with the inside of the reservoir. 2. The air cylinder according to claim 1, wherein the air cylinder is formed in a part of the cap body and has an opening that opens to the inside of the reservoir, and the opening is formed separately from the cap body. And a hollow stepped cylinder fitted to the reservoir cap. 3. The hollow cylinder according to claim 2, wherein the auxiliary air supply / exhaust hole is formed in the outer peripheral portion of the hollow stepped cylinder so as to communicate the air chamber with the inside of the reservoir. A reservoir cap formed by the inner peripheral surface. 4. The auxiliary supply / exhaust hole according to claim 2, wherein the auxiliary air supply / exhaust hole communicates with an outer peripheral portion of the hollow stepped cylinder and an inner peripheral surface of the hollow cylinder to communicate the air chamber with the inside of the reservoir. A reservoir cap formed by the cut groove. 5. The reservoir cap according to claim 2, wherein the auxiliary air supply / exhaust hole is a hole formed in a step bottom of the hollow stepped cylinder. 6. The air supply device according to claim 1, wherein the first air chamber having the ventilation hole and the main supply / exhaust hole are separated from each other by a partition member provided with a communication hole. The reservoir cap is divided into an existing second air chamber, and the communication hole is a hole formed in a side surface of a bag-shaped ridge protruding from the partition member. 7. The method according to claim 6, wherein the partition member comprises:
A reservoir cap fitted to the hollow stepped cylinder and integrated with the hollow stepped cylinder.