JPH0726536B2 - Car radiator cap - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radiator cap that is fitted into a water injection pipe of a radiator for an automobile.

[Conventional technology]

A conventional radiator cap includes a pressurizing valve that is seated at a seal opening end of a water injection pipe formed in a tank portion of the radiator, and a negative pressure valve that opens when the inside of the radiator tank portion falls below a predetermined pressure. It is common.

In such a conventional radiator cap, a coil spring is arranged between the outer cover fitted to the water inlet pipe and the pressure valve, and the pressure valve is biased by the coil spring to open the seal port of the water inlet pipe. It is pressed against the edge and seated.

Normally, the seal opening end of the water inlet pipe is closed by the pressurizing valve seated, but when the pressure inside the tank reaches a predetermined value or more, the pressurizing valve seals against the biasing force of the coil spring. Separate from the open end. As a result, the high-pressure steam in the tank passes through the water injection pipe,
Furthermore, it is designed to flow into the reserve tank through a communication pipe formed in the water injection pipe.

Incidentally, examples of such conventional radiator caps include, for example, Japanese Utility Model Publication No. 49-123440 and Japanese Utility Model Publication 51-8513.
5 and JP-A-55-41391.

[Problems to be solved by the invention]

However, such a conventional radiator cap may cause a problem in the seatability of the pressurizing valve. That is, since one end of the coil spring for urging pressure is in contact with the outer lid fitted to the water inlet pipe,
If the outer lid is not normally fitted to the water inlet pipe, the coil spring may be tilted and the biasing force to the pressurizing valve may be biased.

[Means for solving problems]

In the present invention, the following measures are taken in order to solve the above problems. That is, the first communication hole is formed in the inner lid that is rotatably joined to the outer lid. The first communication hole is opened by the pressurizing valve when the pressure in the tank portion of the automobile radiator reaches or exceeds the predetermined pressure. A second communication hole is formed in this pressurizing valve, and the second communication hole is opened and closed by the atmospheric pressure valve. This atmospheric pressure valve opens the second communication hole by its own weight, and closes the second communication hole when the pressure in the tank portion of the radiator for an automobile reaches a predetermined value or more. Such a radiator cap for an automobile is used.

〔The invention's effect〕

In the present invention, the first communication hole is formed in the inner lid, and the first communication hole is opened by the pressurizing valve when the tank internal pressure of the automobile radiator exceeds a predetermined value. Regardless of how the lid is attached to the water inlet pipe, the pressurizing valve always sits with a constant biasing force, and the seatability of the pressurizing valve can always be kept good, improving the performance as a radiator cap for automobiles. be able to.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a front view showing a radiator for an automobile. An upper tank 5 and a lower tank 6 are connected to both ends of a plurality of tubes 1 arranged side by side via end plates 3 and 4. Corrugated corrugated fins 2 are arranged between the plurality of tubes 1 to promote heat exchange between engine cooling water flowing inside the tubes 1 and the atmosphere outside the tubes 1.

The upper tank 5 is provided with an introduction pipe 7 for introducing cooling water from an engine (not shown) and a water inlet pipe 9 for replenishing the engine cooling water. Water injection pipe 9
The inside of the water inlet pipe 9 and the reserve tank (not shown)
A pipe 10 for connecting to and is formed, and a cap 100 is fitted on the opening end of the water inlet pipe 9.

The lower tank 6 is formed with a lead-out pipe 8 for guiding the cooling water flowing in the tube 1 and collected in the lower tank 6 to the engine side again.

FIG. 1 is a view showing a sectional view taken along the line II of FIG. 2, and the shapes of the cap 100 and the water injection port 9 will be described with reference to this drawing.

The water injection port 9 is composed of an inner cylindrical body 201 connected to the upper tank 5, and an outer cylindrical body 203 connected to an intermediate outer wall of the inner cylindrical body 201 and arranged so as to surround the outer periphery of the inner cylindrical body 201.

The opening end of the inner cylindrical body 201 forms a ring-shaped seal opening end 202, and the opening end of the outer cylindrical body 203 has a ring-shaped fitting seal seat surface 2
Forming 04. The fitting seal seating surface 204 is located above the seal opening end 202. Also, the outer cylinder body 203
An annular flange portion 205 that projects radially outward is formed at the open end of the.

The outer lid 101 of the cap 100 has a saucer shape, and has a side wall portion 103 on the outer peripheral portion thereof, and a part of the tip end of the side wall portion 103 has a bent claw portion that is bent toward the center.
Has 105. The side wall portion 103 covers the outer periphery of the flange portion 205, and the bent claw portion 105 engages with the flange portion 205, so that the cap 100 is fitted to the water inlet pipe 9.

A cutout portion (not shown) is formed in a part of the annular flange portion 205, and by rotating the outer lid 101 so that the bending claw portion 105 is located in the cutout portion,
The cap 100 is removed from the water inlet pipe 9.

A circular hole 102 is formed in the center of the outer lid 101, and the cup-shaped holding plate 1 having a flange is formed in the circular hole 102.
06 is loosely fitted. The bottom surface of the pressing plate 106 is spot-welded so as to overlap the first plate spring 107 and the second plate spring 108.

The first leaf spring 107 has a disc shape having a recess at the center for joining with the holding plate 106, and is arranged so as to face the outer lid 101.

The second leaf spring 108 has a disc portion 108a at the center as shown in FIGS. 3 and 4, and has six leg portions 108b extending radially from the outer peripheral edge of the disc portion 108a. The disc portion 108a is spot-welded to the holding plate 106 and the first leaf spring 107,
The area is larger than the bottom surface portion of the pressing plate 106 and the recessed portion of the first plate spring 107, and the outer peripheral portion thereof is in a state of protruding from these. The first member 110 is sandwiched by the protruding disk portion 108a and the first plate spring 107.

The first member 110 is in the shape of a cup having a circular hole 111 in its substantially central portion and is made of a resin material. In the circular hole 111, the depressions of the pressing plate 106 and the first plate spring 107 described above are located.

The bottom surface portion of the first member 110 is formed continuously from the first bottom surface portion 110a and an annular first bottom surface portion 110a which is joined to the first leaf spring 107, and is formed by the first leaf spring 107 in a predetermined manner. The second bottom surface portion 110b has an annular shape and is separated by a distance. A cylindrical side peripheral wall portion 110c extending in the direction perpendicular to the second bottom surface 110b is formed from the outer peripheral edge of the second bottom surface portion 110b. Further, a locking portion 110d is formed at the opening end of the side peripheral wall portion 110c so as to project inward over the entire circumference thereof. Further, a cutout 110e is formed in a part of the side peripheral wall portion 110c.

An annular seal member 109 made of a rubber material is arranged on the outer peripheral edge of the first leaf spring 107. This seal member 1
09 is the first leaf spring 107 and the second bottom surface portion 11 of the first member 110.
It is sandwiched between 0b and the outer lid 101 and the water inlet pipe 9
When it is fitted into the fitting seal seat surface 204, the fitting seal seat surface 204 is pressed and seated.

At the open end of the first member 110, a second member 112, which is also substantially cup-shaped, is arranged so as to face each other.
The second member 112 has a bottom surface portion 112a having a circular first communication hole 113 in the center portion, a first outer peripheral wall portion 112b standing upright from the outer peripheral edge of the bottom surface portion 112a, and the first outer peripheral wall portion 112b. A horizontal portion 112c that extends horizontally outward from the outer peripheral wall portion 112b and a second outer peripheral wall portion 112d that stands upright at a right angle from the outer peripheral edge of the horizontal portion 112c.
Consists of. A locking portion 112e protruding outward is formed at the opening end of the second outer peripheral wall portion 112d. Further, a cutout portion 112f is formed in a part of the second outer peripheral wall portion 112d.

Second part other than the locking part 112e and the locking part 112c of the second member 112
The outer diameter of the outer peripheral wall portion 112d is equal to the side peripheral wall portion 110c of the first member 110.
Also, the second outer peripheral wall portion 112d of the second member 112 is located inward of the side peripheral wall portion 110c of the first member 110, and is slightly smaller than the inner diameter of the locking portion 110d. When the outer lid 101 is removed from the water inlet pipe 9, the second member 112
The locking portion 112c of the first member 110 and the locking portion 110d of the first member 110 are engaged with each other, and the second member 112 is prevented from falling off.

On the back surface of the horizontal portion 112c of the second member 112, the horizontal portion 112c
A seal member 115 having the same planar shape as c is adhered. The seal member 115 is made of a rubber material, and when the outer lid 101 is fitted to the water inlet pipe 9, the second member 11 is formed.
By the urging force of the second leaf spring 108 that abuts on the tip of the second outer peripheral wall portion 112d, the second seat spring is always pressed and seated on the seal opening end 202.

The first communication hole 113 formed in the bottom surface 112a of the second member 112.
An annular pressurizing valve seal projection 117 is formed on the opening edge of the second member 112 so as to project inwardly of the second member 112. Further, the spring receiving member 12 made of a resin material is provided at the connecting portion between the first outer peripheral wall portion 112b and the horizontal portion 112c of the second member 112.
0 is connected using the elasticity of the resin. The spring receiving member 120 has a donut shape having a through hole 121 in the central portion, and has a side peripheral wall portion 123 for connecting to the second member 112 on the outer peripheral portion. Also, the through hole 121
A flange portion 122 extending toward the bottom surface portion 112a of the second member 112 is formed on the peripheral edge of the opening.

The first member 110 and the second member 112 described above form an inner lid.

A pressurization valve 130 for opening and closing the first communication hole 113 is arranged inside the cup-shaped second member 112. The substrate portion 135 of the pressurizing valve 130 has a donut shape having a circular second communication hole 131 penetrating the upper and lower surfaces of the pressurizing valve 130, and has an outer diameter larger than that of the first communication hole 113. Has become.

The surface of the base plate portion 135 on the pressurizing valve seal protrusion 117 side is
A valve seal member 132 having the same planar shape as 135 is attached. The valve seal member 132 is made of a material such as rubber so that the pressurizing valve seal protrusion 117 can be properly seated.

A cylindrical spring positioning flange 133 is formed on the other surface side of the board portion 135. Further, a cylindrical flange 136 extending in the same direction as the spring positioning flange 133 is also formed on the opening peripheral edge of the second communication hole 131.

A coil spring 134 is arranged between the pressurizing valve 130 and the spring receiving member 120 to urge the pressurizing valve 130 in a direction in which the valve sealing member 132 and the pressurizing valve sealing protrusion 117 come into close contact with each other. That is, one end of the coil spring 134 abuts between the flange portion 122 of the spring receiving member 120 and the side peripheral wall portion 123, and the other end abuts on the outer peripheral position of the spring positioning flange 133 of the pressurizing valve 130.

The second communication hole 131 formed in the pressurizing valve 130 is provided in the atmospheric pressure valve 14
Opened and closed by 0. The atmospheric pressure valve 140 includes a disc-shaped disc portion 144 and a shaft erected on one side of the disc portion 144.
It consists of 142 and.

The outer shape of the disc portion 144 is smaller than the inner diameter of the first communication hole 113, and is located on the inner side of the first communication hole 113.
An annular atmospheric pressure valve seal projection 141 is formed on the outer peripheral edge of the surface of the disc portion 144 on the valve seal member 132 side.

Further, a columnar shaft 142 is erected in the approximate center of the surface of the disc portion 144 on which the atmospheric pressure valve seal projection 141 is formed. The shaft 142 is located inside the second communication hole 131, and its outer diameter is smaller than the inner diameter of the second communication hole 131 by a predetermined amount.

A disc-shaped stopper 143 having an outer diameter slightly larger than the inner diameter of the second communication hole 131 is fitted to the tip of the shaft 142. The atmospheric pressure valve 140 is movable in the second communication hole 131 in the axial direction of the shaft 142, and the stopper 143 prevents the atmospheric pressure valve 140 from falling out of the second communication hole 131 due to its own weight or the like. ing. Even if the atmospheric pressure valve 140 is located at the lowest position in FIG. 1 and the stopper 143 is in contact with the tip of the flange 136, the second communication hole 131 is not blocked by the stopper 143.

The foot portion 51, which is the open end of the upper tank 5, is fitted into the groove formed in the outer peripheral portion of the core plate 3 via the O-ring 53, and the fitting portion is wrapped from the outside by the plate 55. The core plate 3 and the upper tank 5 are connected by machining. The lower tank 6 and the core plate 4 are similarly connected.

Next, the operation of this embodiment will be described.

When the engine (not shown) is in operation, the cooling water that has become relatively hot by the engine flows into the upper tank 5. Due to the inflow of the high-temperature cooling water, the pressure in the upper tank 5 becomes equal to or higher than the atmospheric pressure.

The pressure in the upper tank 5 is the atmospheric pressure valve 140 and the pressurization valve 130.
Act on. When the pressure in the upper tank 5 becomes greater than the force acting on the atmospheric pressure valve 140 due to the gravity of the atmospheric pressure valve 140 moving downward in the figure, the atmospheric pressure valve 140 resists its own weight. It is pushed up. That is, the atmospheric pressure valve seal protrusion 141 of the atmospheric pressure valve 140.
Is pressed by the valve seal member 132 and is seated. As a result, the first communication hole 131 formed in the pressurizing valve 130 is closed.

After that, the pressure in the upper tank 5 further rises, and the pressurizing valve 13
When the pressure acting on 0 becomes larger than the biasing force of the coil spring 134, the pressurizing valve 130 moves upward in the figure against the biasing force of the coil spring 134. Then, the pressurizing-valve seal member 132, which has been seated on the pressurizing-valve seal projection 117 until now, is separated from the pressurizing-valve seal projection 117, and
Communication hole 113 is opened. As a result, the high-pressure steam in the upper tank 5 has the first communication hole 113, the through hole 121, the notch 112f,
It passes through the notch 110e and further flows out to a reserve tank (not shown) via the pipe 10 formed in the outer cylinder body 203.

On the other hand, when the pressure in the upper tank 5 decreases and the pressure acting on the atmospheric pressure valve 140 cannot support the own weight of the atmospheric pressure 140, the atmospheric pressure valve 140 moves downward in the figure due to its own weight. As a result, the atmospheric pressure valve seal projection 141 seated on the valve seal member 132 is released, and the second communication hole 131 is opened. As a result, the inside of the upper tank 5 has the second communication hole 13
1, the through hole 121, the notches 112f and 110e, and the pipe 10 communicate with the reserve tank. Since the inside of the reserve tank is at atmospheric pressure, the inside of the upper tank 5 instantly becomes atmospheric pressure.

After that, when the pressure in the upper tank 5 further decreases and becomes equal to or lower than the atmospheric pressure, the cooling water in the reserve tank passes through the pipe 10, the notches 110e and 112f, the through hole 121, and the second communication hole 131. It is sucked into the upper tank 5.

That is, the atmospheric pressure valve 40 closes when the pressure in the upper tank 5 becomes greater than the pressure obtained by adding the pressure equivalent to the atmospheric pressure valve 140's own weight to the atmospheric pressure, and the pressure corresponding to the own weight of the atmospheric pressure valve 140 from the atmospheric pressure. Open the valve with the pressure minus.

The pressure in the upper tank 5 rises and the atmospheric pressure valve 140 is lifted upward because the pressure in the upper tank 5 directly increases.
The force acting on 140 and the force pulling up the atmospheric pressure valve 140 when the pressure steam in the upper tank 5 passes through the second communication hole 131.

In the above example, the atmospheric pressure valve 140 opens the second communication hole 131 by its own weight when there is no pressure difference between the upper and lower surfaces thereof. However, for example, a spring is provided between the stopper 143 and the substrate portion 130. For example, the atmospheric pressure valve may be always biased with a predetermined force in the valve closing direction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, which is II in FIG.
A sectional view, FIG. 2 is a front view of a radiator for an automobile, and FIGS. 3 and 4 are a plan view and a front view of a second leaf spring. 100 …… Automobile radiator cap, 101 …… Outer lid, 110
...... First member (inner lid), 112 …… Second member (inner lid), 1
13 …… First communication hole, 130 …… Pressurization valve, 131 …… Second communication hole, 140 …… Atmospheric pressure valve.

Claims (1)

[Claims] 1. A radiator cap fitted to a water inlet pipe formed in a tank portion of an automobile radiator, the outer cap engaging with the water inlet pipe, and being rotatable relative to the outer lid. Is constantly pressed by the seal opening end of the water injection pipe, closes the seal opening end, and penetrates the upper and lower surfaces, and the inner lid having the first communication hole penetrating vertically. A pressure valve having a second communication hole, which opens the first communication hole when the pressure in the tank portion of the automobile radiator reaches or exceeds a predetermined pressure; and the pressure in the tank portion of the automobile radiator has a predetermined value. When it becomes above, the radiator cap for motor vehicles provided with the atmospheric pressure valve which closes the said 2nd communicating hole.