JP5027088B2 - Relief valve device for cooling water in internal combustion engine - Google Patents

Description

  The present invention relates to a relief valve for a cooling water jacket in a water-cooled internal combustion engine.

  A water-cooled internal combustion engine is provided with a relief valve that discharges a part of the cooling water from the cooling water jacket when the pressure of the cooling water in the cooling water jacket becomes high.

  Conventionally, this type of relief valve is configured to be directly attached to an internal combustion engine as described in FIG.

  That is, a concave portion is provided on the side surface of the internal combustion engine, and a relief port from the cooling water jacket is opened therein, while a lid body that closes the concave portion is detachably attached to the side surface of the internal combustion engine, A relief valve composed of a valve body and a spring body is provided between the inner surface of the lid body and the relief port so that the valve body is pressed against the relief port by the spring body. When the pressure of the cooling water in the cooling water jacket becomes higher than a predetermined value, the valve body in the relief valve opens the relief port against the spring body.

That is, in the conventional relief valve, the valve body is pressed against the relief port on the internal combustion engine side so as to close it, while the spring body is compressed and deformed when the lid is attached to the internal combustion engine. Thus, the valve body is pressed against the relief port with a predetermined spring force.
Japanese Patent Laid-Open No. 8-100658

  However, the conventional relief valve has a structure in which the valve body and the spring body are separated and assembled by attaching a lid to the internal combustion engine, so that the assembly of the relief valve to the internal combustion engine is performed for each part. There is a problem that a great deal of work is required for the assembly.

  In addition, the valve body is integrally provided with a guide portion that is slidably fitted in the relief port, and the valve body is positioned and guided by the guide portion. As a result, the structure of the valve body is complicated and heavy, and the closing operation tends to be unsmooth. Therefore, there is a problem that not only the price is increased, but the setting accuracy of the valve opening pressure is low.

  The present invention has a technical problem to solve these problems.

In order to achieve this technical problem, claim 1
“The internal combustion engine is provided with a recess, and a relief port that communicates from the cooling water jacket to the cooling water outlet port is opened in the recess, while the internal combustion engine has a lid that closes the recess. A body is detachably attached, and a support plate having a sealing gasket is sandwiched between the lid and the internal combustion engine. The support plate is attached to the lid. A valve body provided in the recess to open and close the relief port is supported by a valve shaft provided on the support plate so as to be opened and closed. A spring body is provided for biasing the relief port closed. "
It is characterized by that.

Claim 2
“In the first aspect of the present invention, the support plate is provided with a through hole that communicates the inside of the recess and the portion of the lid inside the support plate.”
It is characterized by that.

Furthermore, claim 3
“In the description of claim 2, the attachment of the support plate to the lid body is a configuration in which a hook-shaped locking piece protruding from the lid body is inserted into the through hole in the support plate.”
It is characterized by that.

  According to the first aspect, the valve body and the spring body constituting the relief valve are both attached to the support plate having the sealing gasket, and the support plate is attached to the lid. Since the lid is attached to the side surface of the internal combustion engine with the support plate sandwiched between them, the relief valve can be assembled to the internal combustion engine. Can be greatly reduced.

  Moreover, in addition to the above-described configuration, the valve body of the relief valve is supported by a valve shaft provided on the support plate so that it can be opened and closed. Can be done.

  In addition, the valve body is pressed against the relief port on the internal combustion engine side by a spring body provided on the support plate in a state where the valve body is supported by a valve shaft provided on the support plate so as to be freely opened and closed. Therefore, the valve body can be easily configured and reduced in weight while being able to smoothly open and close the valve body, so that the valve opening pressure in the relief valve should be set with high accuracy. In addition, the operating performance of the relief valve can be improved.

  According to claim 2, the pressure in the recess and the pressure in the lid body outside the support plate are equalized by communication through a through hole, and the support due to the pressure difference therebetween Since the deformation of the plate can be prevented, the operation performance of the relief valve can be further improved.

  Furthermore, according to claim 3, in addition to having the effect of claim 2, the mounting structure of the support plate to the lid can be simplified, and the provision of a through hole in the support plate is omitted. This can reduce the manufacturing cost and reduce the weight.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In these drawings, reference numeral 1 denotes a cylinder head fastened to the cylinder block of the internal combustion engine.

  A concave portion 3 is provided in the side surface 2 of the cylinder head 1 so as to open to the side surface 2, and a relief port 5 from the cooling water jacket 4 in the cylinder head 1 is opened in the concave portion 3. In addition, the cooling water outlet port 6 is open.

  Reference numeral 7 denotes a heat-resistant synthetic resin lid plate that closes the recess 3, and the lid body 7 is attached to and detached from the side surface 2 of the cylinder head 1 by fastening a plurality of bolts 8. A recess 10 is provided on the inner surface 9 of the lid 7 that contacts the side surface 2 of the cylinder head 1.

  Reference numeral 11 denotes a relief valve. The relief valve 11 includes a disc-shaped support plate 12, a valve shaft 13, a valve body 14 for opening and closing the relief port 5, a spring body 15, Is configured as described below.

  That is, the support plate 12 in the relief valve 11 is provided with a sealing gasket 16 formed in a U shape with a soft elastic body such as rubber on the outer periphery, and the gasket 16 is placed in the recess 10 in the lid body 7. As shown in FIG. 4, the sealing gasket 16 has a thickness dimension T <b> 0 larger than the depth dimension T <b> 1 of the recess 10, and the lid body 7 with respect to the cylinder head 1. 2, as shown in FIG. 2, the airtightness between the inner side surface 9 of the lid body 7 and the side surface 2 of the cylinder head 1 is maintained by being compressed and deformed. .

  The valve shaft 13 in the relief valve 11 is configured to extend from the support plate 12 in a direction perpendicular to the support plate 12, and the base end thereof is fixed to the support plate 12 by welding or the like. In addition to the stopper 17 being integrally provided, the valve element 14 is fitted so as to slide freely in the axial direction of the valve shaft 13.

  The spring body 15 is provided between the support plate 12 and the valve body 13 in the valve shaft 13, and always contacts the valve body 13 with a stopper 17 at the tip of the valve shaft 13. It is energized as follows.

  The relief valve 11 is attached to the lid body 7 with the support plate 12 fitted in the recess 10 in the lid body 7.

  This attachment is configured as described below.

  That is, at least a pair of locking pieces 18 each having a flange portion 19 at the tip is integrally provided on the lid body 7 so that the locking pieces 18 protrude into the concave portion 3. As shown in FIG. 5, the support plate 12 of the valve 11 is formed with a through hole 20 into which each of the locking pieces 18 is inserted in an arc shape with the valve shaft 13 as the center. A groove hole 21 through which the flange portion 19 of the locking piece 18 passes is provided at one end of the locking piece 18. After the locking piece 18 is inserted into the groove hole 21, the relief valve 11 and the lid plate 7 One or both of them are rotated around the valve shaft 13 so that the relief valve 11 is attached to the lid body 7, and by rotating in the reverse direction, the relief valve 11 is removed from the lid 7 It is configured to allow.

  In the state where the lid body 7 is attached to the cylinder head 1, the flange portion 19 of each locking piece 18 is configured to be appropriately separated from the support plate 11 by a dimension L as shown in FIG. ing.

  Furthermore, the inside of the recess 3 and the inside of the lid 7 are in communication with each other through the through hole 20 outside the support plate 12.

  In this configuration, the valve body 14 and the spring body 15 constituting the relief valve 11 are both attached to the support plate 12 provided with the sealing gasket 16 via the valve shaft 13. Since the lid 7 is attached to the cylinder head 1, the relief valve 11 is attached to the cylinder head 1 by attaching the lid 7 to the cylinder head 1 with the support plate 12 in the relief valve 11 interposed therebetween. Can be assembled.

  In this assembled state, as shown in FIG. 1, the valve body 14 in the relief valve 11 is separated from the stopper 17 in the valve shaft 13 and is moved to the cylinder head 1 side by the spring body 15 and the relief port 5. It is pressed and touched in a state of closing.

  When the pressure in the cooling water in the cooling water jacket 4 becomes higher than a predetermined value, the valve body 14 retreats against the spring body 15 as shown by a two-dot chain line in FIG. By opening the port 5, the cooling water in the cooling water jacket 4 is discharged from the cooling water outlet port 6.

  Although not shown, the cooling water discharged from the cooling water outlet port 6 is guided to the suction side of the cooling water circulation pump.

  In the above embodiment, the relief valve 11 is assembled to the cylinder head 1 in the internal combustion engine. However, the present invention is not limited to this, and the relief valve 11 is configured to be assembled to the cylinder block in the internal combustion engine. It's okay.

  Further, the relief valve 11 in the above-described embodiment is a case where the valve shaft 13 is fixed to the support plate 11 and the valve body 14 is slidably supported by the valve shaft 13. However, the present invention is not limited to this, and the valve body 14 can be fixed to the valve shaft 13 and the valve shaft 13 can be slidably supported with respect to the support plate 11.

It is sectional drawing which shows the state which assembled | attached the relief valve to the cylinder head. It is a principal part enlarged view of FIG. It is sectional drawing which shows the state before attaching a relief valve to a cylinder head. It is a principal part enlarged view of FIG. FIG. 5 is a sectional view taken along line VV in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Cylinder head side surface 3 Concave part 4 Cooling water jacket 5 Relief port 6 Cooling water outlet port 7 Cover body 11 Relief valve 12 Support plate 13 Valve shaft 14 Valve body 15 Spring body 16 Seal gasket 18 Engagement piece 19 鉤Part 20 Through hole

Claims (3)

  The internal combustion engine is provided with a recess, and a relief port that communicates from the cooling water jacket to the cooling water outlet port is opened in the recess, while the internal combustion engine has a lid that closes the recess. A support plate having a sealing gasket is sandwiched between the lid body and the internal combustion engine, and the support plate is attached to the lid body. A valve body provided to open and close the relief port in the recess is supported by a valve shaft provided on the support plate so as to be freely opened and closed. A relief valve device for cooling water in an internal combustion engine, comprising a spring body for biasing the relief port to close.   2. The internal combustion engine according to claim 1, wherein the support plate is provided with a through hole that communicates the inside of the recess and a portion of the lid body outside the support plate. Relief valve device for cooling water.   3. The internal combustion engine according to claim 2, wherein the attachment of the support plate to the lid is configured to insert a hook-shaped locking piece protruding from the lid into the through hole in the support plate. Relief valve device for cooling water.

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