JPS6329013A - Radiator cap for automobile - Google Patents

Abstract

PURPOSE:To improve the setting performance of a positive pressure valve body and prevent the eccentric abrasion by applying the urging force of a coil spring always as the turning moment in the valve closing direction onto a positive pressure valve body and forming a pressure adjusting valve into spherical form. CONSTITUTION:When the pressure in an upper tank 5 lowers, a pressure adjusting valve 140 formed into spherical form shifts downwardly and is attached onto the lower opened port edge 122a of a communication hole 122. Since the communication hole 122 is in opened state, cooling water is inhaled into the upper tank 5 from a pipe 10. When the pressure in the upper tank 5 becomes larger than the atmospheric pressure, the pressure adjusting valve 140 is pressed onto the upper opened port edge 122b of the communication hole 122. Further, when the pressure in the upper tank 5 becomes larger than the urging force of a coil spring 137, a bottom plate 120 as positive pressure valve body rises. Therefore, a positive pressure packing 131 is separated from a positive pressure seal seat surface 202, and the high pressure vapor in the upper tank 5 flows out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radiator cap that is fitted onto a water inlet pipe of an automobile radiator.

[Prior Art] - Examples of conventional radiator caps include Japanese Patent Application Laid-Open No. 55-41391 and Japanese Patent Application Laid-open No. 58-17241.
There is Publication No. 9.

In the systems disclosed in these publications, the coil spring that biases the positive pressure valve element in the valve closing direction contacts the positive pressure valve element at a position above the positive pressure sealing surface, so if the positive pressure valve element opens unevenly, the positive pressure valve There is a problem that the sitting position of the body becomes unstable.

This problem will be explained in more detail. FIG. 3 is a diagram schematically showing the positive pressure valve body and the end face of the water inlet, with reference numeral 501.
is the end face of the water inlet, symbol 503 is the positive pressure valve body, and arrow F. but,
This is the biasing force that the coil spring exerts on the positive pressure valve body 503.

The biasing force F0 of the coil spring always acts in the vertical direction on the surface 505 of the positive pressure valve body 503, so when the positive pressure valve body 503 opens unevenly around point O as shown in FIG. A component force F parallel to the surface 505 acts on the surface 505 of the positive pressure valve body 503.

The uneven opening angle of the positive pressure valve body 50 is θ, and the surface 5 of the positive pressure valve body 503 is
If the distance from 05 to seal 507 is D, component force F
, becomes F, -F, sin θ, and regarding point O, a rotational moment MO-FI XD acts in the direction of arrow R in the figure.

The fact that this rotational moment Mo acts in the direction of arrow R means that the positive pressure valve body 503 is biased in the valve opening direction. That is, although the biasing force F0 originally biases the positive pressure valve body 503 in the valve closing direction, its component force F1 acts in the valve opening direction, and as a result, the positive pressure valve body 503 A problem arises in that seating comfort is impaired.

[Problem that the invention seeks to solve]

The present invention solves the above-mentioned problem of unstable seating of the positive pressure valve element, and aims to enable good seating even when the positive pressure valve element opens unevenly. .

[Means for solving problems]

In order to solve the above problems, the present invention takes the following measures.

In other words, the contact point between the positive pressure valve body and the coil spring is
The positive pressure valve body is located closer to the inner lid of the box than the sealing member joint surface, and the pressure regulating valve is made of a spherical valve body.

[Effect]

The operation of the present invention will be explained based on FIG. Figure 4 shows
FIG. 3 is a diagram schematically showing a positive pressure valve body and a water inlet end face of the radiator cap of the present invention. Coil spring and positive pressure valve body 6
03 is located closer to the inner lid of the box than the sealing surface 607 of the positive pressure valve body 603, that is, lower in the figure, so the point of action of the biasing force F0 of the coil spring is also on the positive pressure valve body 603.
located below the sealing surface of the

As described in the explanation of FIG. 3, a component F1 of the biasing force F0 acts on the surface 605 of the positive pressure valve body 603 in a direction parallel to the surface 605. If the vertical distance from the surface 605 of the positive pressure valve body 603 to the extension of the sealing surface 607 is Dl, a rotational moment of M 1 '' F (x D 1 ) acts in the direction of arrow P around point 0.

That is, a rotational force in the valve closing direction acts on the positive pressure valve body 603.

On the other hand, since the pressure regulating valve is made of a spherical valve body, it is rotated by the pressure steam flow passing through the communication hole when opening and closing the communication hole.

〔Effect of the invention〕

As described above, if the radiator cap of the present invention is used, even if the positive pressure valve element opens unevenly, the biasing force of the coil spring that biases the positive pressure valve element in the valve closing direction will always be applied to the positive pressure valve element in the valve closing direction. Since the positive pressure valve body acts as a rotational force to the positive pressure valve body, the positive pressure valve body is always properly seated, and seating performance can be improved.

Improving the seating performance of the positive pressure valve element means that the positive pressure valve element always seats on the seal seating surface of the water inlet pipe in the same position, and the seal member joined to the positive pressure valve element always sits in the same position. This means that it comes into contact with the seal seat of the water inlet pipe.

When the seal member contacts the seal seat surface of the water inlet pipe, a contact groove is formed on its surface as a permanent strain, so if the contact position between the seal member and the seal seat surface is If this is different, the abutment groove would be located at a location other than the abutment point, resulting in a problem that the seal between the seal member and the seal seat surface would be impaired, but the present invention does not have this problem.

Further, since the pressure regulating valve is composed of a spherical valve body and is rotated by the pressure evaporation flow, the contact surface with the opening edge of the communication hole is not constant but changes.

Therefore, it is possible to prevent uneven wear of the pressure regulating valves, and it is possible to always perform good sealing.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a front view showing a radiator for an automobile, in which an upper tank 5 and a lower tank 6 are connected to both ends of a plurality of tubes 1 arranged in parallel via end plates 3.4. Wave-shaped fins 2 are joined between the plurality of tubes 1 by means such as brazing to promote heat exchange between the engine cooling water flowing inside the tubes 1 and the atmosphere outside the tubes 1. There is.

The upper tank 5 is formed with an introduction pipe 5 for introducing cooling water from an engine (not shown) and a water inlet pipe 9 for replenishing the engine cooling water. Water inlet pipe 9
The inside of the water inlet Vibe 9 and the reserve tank (not shown)
A bite 10 is formed to connect the water inlet pipe 9 with a cap 100 fitted to the open end of the water inlet pipe 9.

A lead-out vibe 8 is formed in the lower tank 6 to guide the cooling water flowing through the tube 1 and collected in the lower tank 6 back to the engine side.

FIG. 1 is a cross-sectional view taken along line I-1 in FIG. 2, and the shapes of the cap 100 and the water inlet 9 will be described based on this diagram.

The water inlet 9 consists of an inner cylindrical body 2゜1 connected to the upper tank 5, and an outer cylindrical body 203 connected to the 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 open end of the inner cylindrical body 201 has an annular positive pressure seal seat surface 202.
The open end of the outer cylinder body 203 forms an annular fitting seal seat surface 204.

The fitting seal seat surface 204 is the positive pressure seal seat surface 202.
It is located higher up. Further, an annular flange portion 205 protruding radially outward is provided at the open end of the outer cylinder 203.
is formed.

The outer lid 101 of the camp 100 has a saucer-shaped receiver, and has a side wall 103 on its outer periphery.
A part of the tip of 03 has a bending claw portion 105 that is bent toward the center. This side wall portion 103 covers the outer periphery of the flange portion 205, and the bending claw portion 105 engages with the flange portion 205, so that the cap 10
0 is fitted into the water inlet pipe 9.

Note that a part of the annular flange portion 205 has a notch (
The camp 100 is removed from the water inlet pipe 9 by rotating the outer cover 101 so that the bending claw lO5 is located in this notch.

An inner cover 107 is disposed inside the outer cover 101. This inner lid 107 also has a tray shape, and has a side wall 109 on its outer periphery, and a locking protrusion 111 that protrudes inward on the tip side of the side wall 109. ing.

A circular hole 102 is formed approximately at the center of the outer lid 101, and a circular recess 108 is formed approximately at the center of the inner lid 107. Outside so that this circular hole 102 and circular depression 108 are facing each other! 1101 and the inner lid 107 are placed one on top of the other, and the two are joined by a presser Fi 113.

The retainer Fi, 113 has a flange shape at the outer peripheral end, and its bottom surface is connected to the circular hole 102 of the outer lid 101.
It is spot welded to the circular recess 108 of the inner lid 107 through the hole. Therefore, the holding plate 113 and the inner cover 107 are welded together so that they cannot move relative to each other, but since the outer cover 101 is only held between the flange of the holding plate 113 and the inner cover 107, the outer cover 101 It is rotatable relative to the inner lid 107 and the restraining plate 113.

A leaf spring 113 made of a thin metal plate is sandwiched between the outer cover 101 and the inner cover 107. Since this leaf spring 113 is also simply held, it is rotatable with respect to the outer cover 101 and the inner cover 107. Further, an annular pressure gasket 115 made of a rubber material is attached to the inner surface of the leaf spring 113, and when the cap 100 is fitted onto the water inlet pipe 9, the pressure gasket 115
5 is a seal seating surface 20 that is fitted by the biasing force of a leaf spring 113.
It is designed to be seated at number 4.

A bottom plate 120, which is a positive pressure valve element, is disposed inside the inner lid 107. This bottom plate 120 is
It has a stepped cup shape and is arranged so as to face the inner M107.

The bottom plate T-120 includes a bottom part 1211, a side wall part 123 that stands up perpendicularly from the outer edge of this bottom part 121, a flat part 125 that extends horizontally from the end of this side wall part 123, and a flat part 125 that stands up perpendicularly from the outer edge of this flat part 125. flange portion 12
7. The flange portion 127 has a locking portion 129 projecting horizontally from the tip thereof.

The outer diameter of the bottom part 121 and the side wall part 123 is the same as that of the inner cylinder 201.
The bottom surface portion 121 and the side wall portion 123 are located inside the inner cylindrical body 201 .

The flat part 125 extends slightly outward from the outer diameter of the inner cylindrical body 201, and a circular positive pressure packing 131 made of a rubber material is provided on the bottom side of the flat part 125, which is the sealing member joint surface.
is pasted. Then, this positive pressure packing 131 is seated on the positive pressure seal seating surface 202.

The outer diameter of the flange portion 127 is equal to the engagement protrusion 11 of the inner lid 107.
1, and the outer diameter of the locking portion 129 is set to be slightly smaller than the inner diameter of the side wall portion 109 of the inner M107. As a result, the flange portion 127
The locking portion 129 is located within the side wall portion 109 of the inner lid 107, the locking portion 129 uses the inner wall of the side wall portion 109 as a guide surface, and the engaging protrusion 111 uses the outer wall of the flange portion 127 and the guide surface. While the bottom plate 120 is
It becomes possible to move relatively up and down within 07.

In addition, the bottom plate 120 is prevented from being pulled out and falling downward by the engagement of the locking part 129 with the engagement protrusion 111.

A communication hole 122 passing through the upper and lower surfaces of the bottom plate 120 is formed approximately at the center of the bottom surface portion 121 . This communication hole 122 is defined by a cylindrical communication hole forming wall 133 that is integrally formed on the upper surface of the bottom part 121, and a spherical pressure regulating valve 140 is disposed within this communication hole 122. has been done.

Lower opening end 12 located on the upper tank 5 side of the communication hole 122
2a has its opening edge partially cut away (not clearly shown in FIG. 1), and when the pressure regulating valve 140 is in contact with the lower opening end 122a as shown in FIG. , the communication hole 122 is open through the notch.

On the other hand, when the pressure regulating valve 140 moves upward in the figure from the state shown in FIG. , the communication hole 122 is placed in a blocked state.

Horizontal part 125, side wall part 123, bottom part 121, center wall 1
The bottom plate 1 is provided on the surface facing the inner lid 107 of 33.
A plurality of ribs 135 are formed to increase the strength of 20.

A coil spring 137 is arranged between the inner 11107 and the bottom plate 120 to bias the bottom plate 120 toward the inner cylindrical body 201.

One end of this coil spring 137 is in contact with the inner wall surface of the inner lid, and the other end is in contact with the upper wall of the bottom surface portion 121.

The foot portion 51, which is the open end of the upper tank 5, is connected to the core plate 3.
is fitted into a groove formed on the outer periphery of the plate 55 via an O-ring 53.
The core plate 3 and the upper tank 5 are connected by wrapping and tightening.

Note that the lower tank 6 and core plate 4 are also connected in the same manner.

Next, the operation of this embodiment will be explained. The space above the bottom plate 120 in the figure is communicated with a reserve tank (not shown) through the vibrator 10, so that it is always maintained at atmospheric pressure.

Therefore, when the pressure inside the upper tank 5 is atmospheric pressure or lower, the pressure regulating valve 140 moves downward in the figure and comes into contact with the lower opening end 122a of the communication hole 122. In this state, as described above, the communication hole 122 is open, so the cooling water stored in the reserve tank flows through the vibrator 10, the space above the bottom plate 120, and the communication hole 122.
It is sucked into the upper tank 5.

On the other hand, when the pressure inside the upper tank 5 becomes higher than atmospheric pressure, such as when the engine is started, this pressure is adjusted to the pressure regulating valve 14.
0 receives pressure, and in combination with the force blowing the pressure regulating valve 140 upward due to the steam flow flowing around the pressure regulating valve 140, the pressure regulating valve 140 is pushed toward the upper opening end 122b of the communication hole 122. . That is, the communication hole 122 is blocked.

Further, the pressure inside the upper tank 5 increases, and the force exerted on the bottom plate 120 upward in the figure by this pressure becomes greater than the force exerted downward in the figure by the coil spring 137. Move upwards.

That is, the positive pressure gasket 131 attached to the bottom plate 120 is attached to the positive pressure seal seat surface 20 of the inner cylinder body 201.
2, the high pressure steam in the upper tank 5 passes between the positive pressure seal 131 and the positive pressure seal seat 202, and further between the outer cylinder 203 and the inner cylinder 201. The liquid flows out into the reserve tank through the space and the vibrator 19.

In the above example, the bottom plate 120 is made of a resin material, and the pressure regulating valve 140 is also made of a resin material or a metal material.

[Brief explanation of the drawing]

1 is a sectional view showing the first embodiment, 1-1 sectional view in FIG. 2, a front view showing an automobile radiator, and 3.
The figure is a schematic diagram showing a conventional example, and Figure 4 is a schematic diagram showing the present invention. 5... Upper tank, 101... Outer lid, 107... Inner lid. 120...Bottom plate (positive pressure valve body), 137...
・Coil spring 1140...pressure adjustment valve.

Claims (1)

[Scope of Claims] A radiator cap that is fitted onto a water inlet pipe formed in a tank portion of an automobile radiator, comprising an outer cover that engages with the water inlet pipe, and a cap that is located inside the outer cover. an inner cover that is rotatably connected to the outer cover; and an inner cover that is arranged to be movable in the axial direction at a position opposite to the inner cover, and for connecting a sealing member to a surface opposite to the inner cover. a positive pressure valve body having a seal member joint surface; a seal member joined to the seal member joint surface of the positive pressure valve body and seated on the seal seat surface of the water inlet pipe; a pressure regulating valve that communicates and shuts off a communication hole connecting a space above and a space below the positive pressure valve body; and a pressure regulating valve that is disposed between the inner cover and the positive pressure valve body, one end of which is connected to the inner cover. a coil spring, the other end of which contacts the positive pressure valve body and urges the positive pressure valve body in a direction opposite to the inner lid, the other end of the coil spring contacts the positive pressure valve body; The pressure regulating valve is in contact with the positive pressure valve on an extended surface of the sealing member joint surface or at a position opposite to the inner cover from this extended surface, and the pressure regulating valve is a spherical valve capable of closing the opening edge of the communication hole. The body of the car radiator cap.