JP2858525B2 - Automotive radiator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator for an automobile in which a radiator cap is fitted to a water inlet pipe. 2. Description of the Related Art A conventional radiator cap structure for an automobile is disclosed in, for example, Japanese Utility Model Laid-Open No. 50-113737.
And U.S. Pat. No. 2,649,986. Among these prior arts, the one disclosed in Japanese Utility Model Laid-Open Publication No. Sho 50-113737, as shown in FIG. 5, has a cylinder 702 constituting a water inlet pipe 701 having a stepped cylindrical shape. The positive pressure valve body 704 comes into contact with the seal seating surface 703 which is the upper side surface of the step portion, and opens and closes the opening 705. [0003] Further, in the structure disclosed in US Pat. No. 2,649,986, a positive pressure valve element is opened and closed by entering and exiting an opening of a circular hole provided directly in a tank. [0004] The positive pressure valve element of the radiator cap for an automobile has an urging force of a coil spring for urging the positive pressure valve element from above and a tank for pushing up the positive pressure valve element from below. The opening is repeatedly opened and closed by the balance with the pressure of the opening. Here, it is required that the seal member joined to the positive pressure valve body always abuts on the seal seat surface of the opening at the same position. In other words, in the seal member joined to the positive pressure valve body, a contact groove is formed as a permanent strain on the surface by the contact of the opening with the seal seat surface. If the contact position is different every time the valve is closed, the contact groove will be located at a position other than the contact point, and there is a problem that the sealing performance between the seal member and the seal seat surface is impaired. However, among the above-mentioned prior arts shown in FIG. 5, there is no one that restricts the horizontal movement of the seal portion of the positive pressure valve body. There is such a problem that the sealing performance is deteriorated. In order to deal with such a problem, it is conceivable to increase the dimensional accuracy of the radiator cap in the lateral direction. However, the improvement in dimensional accuracy and processing accuracy has reached the limit. On the other hand, in the technology disclosed in US Pat. No. 2,649,986, as shown in FIG.
The circular hole 802 opened in the tank member 801 is used as an opening, and the positive pressure valve body 803 enters and exits the circular hole 802 to open and close the opening.
It is not expected that the positive pressure valve body 803 always moves in and out of the tank 02 in the vertical direction, and the opening is opened and closed in a posture inclined with respect to the tank member 801 as shown in FIG. The inclination of the seal member 8 varies depending on the circumferential direction of the circular hole 803.
04 cannot always contact the seal seat surface 805 of the opening at the same position, and as described above, the sealing performance between the seal member and the seal seat surface is impaired. Accordingly, the present invention is to provide a radiator cap which solves the above-mentioned problems and realizes a high sealing performance while responding to the demand for miniaturization of the radiator cap and without requiring high dimensional accuracy and processing accuracy. With the goal. [0008] In order to solve the above-mentioned object, the present invention provides (a) a radiator for an automobile in which a radiator cap is fitted to a cylindrical water inlet pipe formed in a tank portion. (B) an outer lid (101) that engages with the water inlet pipe; and (c) an inner lid that is rotatably joined to the outer lid inside the outer lid. (107) and (d) a bottom surface portion (121) and a side wall portion which stands substantially perpendicularly from an outer edge of the bottom surface portion, which is disposed at a position facing the inner lid so as to be movable in an axial direction of the water inlet pipe. (123)
A positive pressure valve element (120) having a flat portion (125) extending horizontally from the upper end side of the side wall portion, the flat portion being seated on a seal seat surface (202) of the water inlet pipe.
(E) disposed between the inner lid and the positive pressure valve body, one end of which is in contact with the inner lid, and the other end of which is in contact with the upper surface of the bottom portion of the positive pressure valve body, Spring (137) for urging the flat part of the pipe toward the seal seat surface of the water inlet pipe.
And (f) an annular rubber seal member (131) joined to the lower surface of the flat portion, and (g) an anti-joint surface of the rubber seal member is seated on a seal seat surface of the water inlet pipe. (H) the sealing surface is always located above the lower end surface of the bottom portion, and (i ) the water inlet pipe is in a range where the positive pressure valve body moves in the axial direction. The outer wall surface of the side wall portion and the inner wall surface of the water injection port face each other with a small gap so that the inner wall surface of the side wall serves as a guide that allows only the axial movement while restricting the horizontal movement of the positive pressure valve body. We adopt the technical means that we do. The operation of the present invention in the above configuration will be described with reference to FIG. As shown in this figure, the positive pressure valve body 120 of the radiator cap of the present invention has a bottom surface portion 121, a side wall 123, and a flat surface portion 125.
5, an annular rubber seal member 131 joined to the lower surface
Anti bonding surface is a sealing surface seated in positive pressure seal seat surface 202 of the water inlet pipe 9. When the positive pressure valve body 120 moves up and down in FIG. 1 to open and close the opening, the sealing surface
Because it is always above the bottom of the valve,
The side wall of the positive pressure valve element in the entire range of vertical movement of the pressure element
Since the portion faces the inner wall surface of the water inlet pipe, the outer wall surface of the side wall portion 123 of the positive pressure valve body 120 extends along the inner wall surface of the water inlet pipe facing the outer wall surface with a small gap. Move. In other words, the positive pressure valve body 120 and the water inlet pipe
9 and the so-called piston-cylinder relationship.
In addition, the inner wall surface of the water inlet pipe 9 regulates the horizontal movement of the positive pressure valve body 120, particularly, the horizontal direction of the seal portion, and functions as a guide for accurately moving the positive pressure valve body 120 only in the vertical direction. For this reason, the seal member joined to the positive pressure valve body always contacts the seal seat surface of the water inlet pipe at the same position.
For this reason, the position of the contact groove formed by the contact between the seal member joined to the valve body and the seal seat surface of the opening always serves as the contact point, and the sealing property between the seal member and the seal seat surface is improved. Is guaranteed. As described above, the radiator cap of the present invention provides a radiator cap that achieves high sealing performance without requiring high dimensional accuracy and processing accuracy under the current situation where miniaturization is required. can do. 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. Upper and lower tanks 5 and 6 are connected to both ends of a plurality of tubes 1 arranged side by side through end plates 3 and 4. A fin 2 having a corrugated shape is joined between the plurality of tubes 1 by means such as brazing to promote heat exchange between engine cooling water flowing in the tube 1 and a body outside the tube 1. I have. 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 supplying engine cooling water. A pipe 10 for connecting the inside of the water inlet pipe 9 with a reserve tank (not shown) is formed, and a cap 100 is fitted on an open end of the water inlet pipe 9. An outlet pipe 8 is formed in the lower tank 6 for guiding the cooling water flowing in the tube 1 and gathering in the lower tank 6 to the engine side again. FIG. 1 is a sectional view taken along the line II of FIG. 2, and the shapes of the cap 100 and the water inlet 9 will be described with reference to FIG. The water injection port 9 includes an inner cylinder 201 connected to the upper tank 5 and an outer cylinder 203 connected to an intermediate outer wall of the inner cylinder 201 and arranged to surround the outer periphery of the inner cylinder 201. The open end of the inner cylindrical body 201 forms an annular positive pressure seal seat surface 202, and the open end of the outer cylindrical body 203 forms an annular fitting seal seat surface 204. And
The fitting seal seat surface 204 is located above the positive pressure seal seat surface 202. Further, an annular flange portion 205 that protrudes radially outward is formed at the open end of the outer cylinder 203. The outer lid 101 of the cap 100 has a saucer shape, and has a side wall 103 on the outer periphery thereof.
A part of the front end of the side wall 103 has a bent claw 105 bent toward the center. The side wall portion 103 covers the outer periphery of the flange portion 205, and the bent claw portion 105 is engaged with the flange portion 205.
The cap 100 is fitted to the water inlet pipe 9. A notch (not shown) is formed in a part of the annular flange 205. By rotating the outer lid 101 so that the bent claw 105 is positioned in the notch. , Cap 100 is water inlet pipe 9
More removed. Inside the outer lid 101, there is an inner lid 10
7 are arranged. The inner lid 107 also has a saucer shape, has a side wall portion 109 on the outer peripheral portion, and further has an engagement protrusion 111 protruding inward at the tip end of the side wall portion 109. . A circular hole 102 is formed substantially at the center of the outer lid 101, and a circular recess 108 is formed substantially at the center of the inner lid 107. The outer lid 101 and the inner lid 107 are arranged such that the circular hole 102 and the circular recess 108 face each other.
Are overlapped with each other, and both are joined by the holding plate 113. The holding plate 113 has a cup shape having a flange at the outer peripheral end, and the bottom surface thereof has a circular hole 102 of the outer lid 101.
And is spot-welded to a circular recess 108 of the inner lid 107. Therefore, although the holding plate 113 and the inner lid 107 are welded so as not to move relative to each other, since the outer lid 101 is only sandwiched between the flange of the holding plate 113 and the inner lid 107, the outer lid 101 is The inner lid 107 and the holding plate 113 are rotatable. A leaf spring 113 made of a thin metal plate is sandwiched between the outer lid 101 and the inner lid 107. Since this leaf spring is also merely clamped, the outer lid 101
And the inner lid 107 is rotatable. Also,
An annular holding packing 115 made of rubber material is adhered to the inner surface of the leaf spring 113, and the cap 100
When this is fitted to the water inlet pipe 9, the presser packing 115 is seated on the fitting seal seat surface 204 by the urging force of the leaf spring 113. Inside the inner cover 107, a bottom plate 120 as a positive pressure valve is disposed. The bottom plate 120 has a stepped cup shape and has an inner lid 107.
And are arranged to face each other. Bottom plate 12
Reference numeral 0 denotes a bottom surface portion 121, a side wall portion 123 that stands vertically from an outer edge of the bottom portion 121, a flat portion 125 that extends horizontally from an end of the side wall portion 123, and a flange portion that stands vertically from an outer edge of the flat portion 125. 127, this flange portion 1
27 has a locking portion 129 that protrudes horizontally from the distal end portion. The outer diameters of the bottom surface 121 and the side wall 123 are as follows.
It is set smaller than the inner diameter of the inner cylinder 201, and the bottom surface 121 and the side wall 123 are located inside the inner cylinder 201. Then, a guide portion of the bottom plate 120 is formed by the outer wall surface of the side wall portion 123 and the inner wall surface of the inner cylindrical body 201. The flat portion 125 extends slightly outward from the outer diameter of the inner cylindrical body 201, and an annular positive pressure packing 131 made of a rubber material is attached to the sealing member joining surface on the bottom surface side of the flat portion 125. Have been. Then, the positive pressure packing 131 is seated on the positive pressure seal seat surface 202. The outer diameter of the flange portion 127 is set to be slightly smaller than the inner diameter of the engaging projection 111 of the inner lid 107.
The outer diameter of the locking portion 129 is equal to the side wall portion 109 of the inner lid 107.
It is set smaller by a minute amount. As a result, the flange portion 127 and the locking portion 129 are attached to the side wall portion 109 of the inner lid 107.
The locking portion 129 is located in the side wall portion 109.
Is used as a guide surface, and the engaging projection 111 is
The bottom plate 120 is used as the outer wall of 27 and the guide surface.
Can move the inner lid 107 up and down relatively. Further, the bottom plate 120 is
29 is prevented from falling down by engaging with the engaging protrusion 111. A substantially central portion of the bottom portion 121 is provided with a through hole penetrating the upper and lower surfaces. A substantially cylindrical central wall 133 is formed on the surface of the bottom portion 121 on the side of the inner lid 107 so as to surround the through hole. Are formed. The center wall 133 extends upward and has a tapered shape that becomes thinner as it goes upward. Horizontal section 125, side wall section 123, bottom section 12
1. A plurality of ribs 1 are provided on the surface of the center wall 133 facing the inner lid 107 in order to increase the strength of the bottom plate 120.
35 are formed. Inner lid 107 and bottom plate 1
20 between the bottom plate 120 and the inner cylindrical body 201.
A coil spring 137 for urging toward is provided. One end of the 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 surface wall of the bottom surface portion 121. On the lower surface side of the bottom plate 120, a pressure regulating valve 140 is arranged. The pressure adjusting valve 140 includes a disk-shaped flat plate portion 141 and a center rod portion 143 protruding from the center of the flat plate portion 141. A pressure regulating packing 147 is attached to the surface of the flat plate portion 141 on the bottom plate 120 side. Further, the center rod portion 143 has a tapered shape that becomes thinner toward the distal end, and is inserted into the center wall 133 via a predetermined gap. A stop plate 145 is provided at the end of the center rod 143.
Are fitted to prevent the pressure regulating valve 140 from falling off from the inside of the central wall 133. Since the outer diameter of the center rod portion 143 is smaller than the inner diameter of the central wall 133 by a predetermined amount, a predetermined gap is secured between the two, and the predetermined gap is formed between the inside of the upper tank 5 and the upper surface of the bottom plate 120. Are formed to form a communication passage 150 communicating the. When the pressure regulating valve 140 is pushed upward in the figure and the pressure regulating packing 147 is seated on the lower surface of the bottom surface 121, the communication of the communication passage 150 is cut off.
The foot 51, which is the open end of the upper tank 5, is
Is inserted through an O-ring 53 into a groove formed on the outer peripheral portion of the plate 5.
The core plate 3 and the upper tank 5 are connected by caulking so as to be wrapped with the core plate 3. The lower tank 6 and the core plate 4 are similarly connected. Next, the operation of the present embodiment will be described. The space above the bottom plate 120 in the drawing communicates with a reserve tank (not shown) by the pipe 10 and is always kept at the atmospheric pressure. Therefore,
When the pressure in the upper tank 5 decreases to the atmospheric pressure or lower, the pressure regulating valve 140 moves downward in the figure, and the pressure regulating packing 147 is separated from the bottom surface 121 of the bottom plate 120. As a result, the central rod portion 1 of the pressure regulating valve 140
Communication passage 15 formed between 43 and central wall 133
The cooling water stored in the reserve tank is sucked into the upper tank 5 through the pipe 10, the space above the bottom plate 120, and the communication passage 150. On the other hand, when the pressure in the upper tank 5 becomes higher than the atmospheric pressure, for example, when the engine is started, this pressure is received by the flat plate portion 141 of the pressure regulating valve 140 and directed toward the bottom surface 121 of the bottom plate 120. The pressure regulating valve 140 is pressed. That is, the pressure regulating packing 147 comes into close contact with the bottom surface portion 121, and the communication path 150 is shut off. further,
When the pressure in the upper tank 5 increases and the force that the bottom plate 120 receives in the upward direction in the figure becomes greater than the force that the coil spring 137 receives in the downward direction in the figure, the bottom plate 120 moves to the side wall 123.
Moves upward in the figure along the inner wall surface of the inner cylinder 201. That is, the positive pressure packing 131 adhered to the bottom plate 120 is separated from the positive pressure seal seating surface 202 of the inner cylinder 201, and the high pressure steam in the upper tank 5 is removed from the positive pressure packing. 131 and positive pressure seal seat surface 202
And flows out to the reserve tank via the pipe 109 and the space between the outer cylinder 203 and the inner cylinder 201. Next, a second embodiment of the present invention will be described. In the above-described first embodiment, the pressure regulating valve 140 is inserted through the center wall 133, and only the stopper plate 145 prevents the stopper from coming off. However, in the second embodiment, as shown in FIG. Then, a small spring 301 is arranged between the stopper plate 145 and the bottom plate 120. The central rod 143 of the pressure regulating valve 140
Also, it is formed in a straight cylindrical shape, and a stopper plate 145 that acts as a spring receiver is fitted to the tip end thereof. The small spring 301 urges the pressure regulating valve 140 upward in the figure with a predetermined force, and the pressure regulating packing 147 is always brought into close contact with the bottom plate 120 with this predetermined force. Accordingly, when the pressure in the upper tank 5 drops below a predetermined value and the force for pulling the pressure adjustment valve 140 downward in the figure overcomes the urging force of the small spring 301, the pressure adjustment valve 140 moves downward in the figure. , The communication passage 150 is opened. Other configurations and operations are the same as those of the first embodiment. In the first and second embodiments, the pressure regulating valve 14
Although the pressure-adjusting packing 147 to be stuck to 0 is a flat ring-shaped packing, it is not limited to such a shape, and may be, for example, a conventionally known O-ring 401. FIG. 4 shows an example of this case.

[Brief description of the drawings] FIG. 1 is a sectional view showing a first embodiment of the present invention. FIG. 2 is a front view showing a radiator for an automobile. FIG. 3 is a sectional view showing a second embodiment of the present invention. FIG. 4 is a sectional view showing another application example of the present invention. FIG. 5 is a schematic diagram showing a conventional example. FIG. 6 is a schematic diagram showing a conventional example. [Explanation of symbols] 5 Upper tank 101 outer lid 107 inner lid 120 Bottom plate (positive pressure valve) 137 Coil spring 140 Pressure regulating valve

Continuation of front page    (72) Inventor Jun Fukuda               1-1-1 Showa-cho, Kariya-shi, Aichi Japan               Denso Co., Ltd. (72) Inventor Seiichi Kato               1-1-1 Showa-cho, Kariya-shi, Aichi Japan               Denso Co., Ltd.                (56) References JP-A-58-172419 (JP, A)                 JP-A-62-247115 (JP, A)                 50-113737 (JP, U)                 Jiko sho 59-16501 (JP, Y2)                 US Patent 2649986 (US, A)                 US Patent 3265048 (US, A)                 US Patent No. 3,386,611 (US, A)

Claims (1)

(57) [Claims] (a) A radiator for an automobile in which a radiator cap is fitted to a cylindrical water inlet pipe formed in a tank portion, and (b) the radiator cap is provided with the water inlet. An outer lid that engages with a pipe, (c) an inner lid that is rotatably joined to the outer lid inside the outer lid, and (d) a position facing the inner lid, A bottom surface portion, a side wall portion that stands substantially vertically from an outer edge of the bottom surface portion, and a flat portion that extends horizontally from an upper end side of the side wall portion; (E) disposed between the inner lid and the positive pressure valve body, one end of which is in contact with the inner lid, and the other end of which is the positive pressure valve. Abutting against an upper side surface of the bottom portion of the body, and a flat portion of the positive pressure valve body is sealed with a seal seat of the water inlet pipe. And (f) an annular rubber seal member joined to the lower surface of the flat portion, and (g) an anti-joint surface of the rubber seal member seals the water inlet pipe. (H) the sealing surface is always located above the lower surface of the bottom portion, and (i ) a range in which the positive pressure valve body moves in the axial direction. The outer wall surface of the side wall portion and the inner wall surface of the water injection port have a small gap so that the inner wall surface of the water inlet pipe serves as a guide that allows only the axial movement while regulating the horizontal movement of the positive pressure valve body. A radiator for an automobile, wherein the radiator faces each other.