JP2006029206A - Engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent steam and cooling water becoming boiling water from suddenly jumping outside from a cooling water replenishing port arranged on a cooling water tank upper surface, by surely securing an outlet of the steam, when expanding since the cooling water in a cooling water tank boils. <P>SOLUTION: In this engine, the cooling water tank 1 is arranged above a cylinder or a crank case. A cooling water replenishing port body 2 is arranged on the upper surface of the cooling water tank 1. A water passage 4 and a steam passage 3 are formed in the replenishing port body 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water-cooled engine, and more particularly to a configuration of a coolant supply port provided in a coolant tank disposed above a cylinder or crankcase.

Conventionally, in a water-cooled engine, a water jacket is provided around the cylinder, a cooling water tank is provided above the cylinder, and the cooling water tank and the water jacket are communicated with each other so that the water jacket can be used when the engine is in operation. When the cooling water in the jacket is warmed, it rises and enters the cooling water tank, and the water in the cooling water tank that is cooler than that enters the water jacket and circulates to cool the cylinder. A cooling water replenishing port is provided at the upper part of the cooling water tank, and the cooling water is filled through the replenishing port, and the inside of the cooling water tank is communicated with the outside air. Even if it increased, it was allowed (see Patent Document 1).
JP-A-9-250388

  However, in the conventional water-cooled engine, when the cooling water in the cooling water tank boils, the cooling water expands and the water surface reaches the replenishing port, and the water surface due to bubbles, water vapor, and volume expansion generated by boiling. The supply port was blocked by the rise, the pressure in the cooling water tank increased, and there was a problem that boiling water and water vapor suddenly jumped out of the supply port. Further, as shown in FIG. 8, a supply port body 62 is provided in an opening provided on the upper surface of the cooling water tank 61, a supply port 61a is provided in the upper part of the supply port body 62, and an outlet hole 63 is provided in the lower part. The replenishing port 61a and the outlet hole 63 are arranged so as not to overlap in plan view so that the boiling water is not directly from the replenishing port when boiling. Further, there is a configuration in which a communication port 64 is provided on one side surface of the upper portion of the replenishing port body 62 so that when the cooling water boils, the pressure of the expansion is released and the water vapor is discharged. However, in this case as well, when boiling, bubbles are generated on the water surface and the water surface rises due to volume expansion and closes the communication port 64, thereby increasing the pressure inside the cooling water tank 61, and boiling water and water vapor at a stretch. Has a problem of jumping out from the supply port 61a.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in the first aspect of the present invention, in the engine in which the cooling water tank is disposed above the cylinder or the crankcase, a cooling water supply port is provided on the upper surface of the cooling water tank, and the water passage and the water vapor supply port are provided in the supply port. A passage is formed.

  According to a second aspect of the present invention, a cooling water overflow passage is provided below the upper end of the outlet of the water vapor passage.

  According to a third aspect of the present invention, the replenishing port body is formed in a cylindrical shape, and the water vapor passage is provided around the upper portion of the replenishing port body.

  According to a fourth aspect of the present invention, a downward wall portion is formed at the outlet portion of the water vapor passage around the upper portion of the replenishing port body.

  According to a fifth aspect of the present invention, in the engine in which the cooling water tank is disposed above the cylinder or the crankcase, a cooling water supply port body is provided on the upper surface of the cooling water tank, and a seal mounting recess is formed on the lower peripheral surface of the supply port body. And a communication groove is formed between the seal mounting recess and the overflow passage.

  As effects of the present invention, the following effects can be obtained.

  According to claim 1, in an engine in which a cooling water tank is disposed above a cylinder or a crankcase, a cooling water supply port is provided on an upper surface of the cooling water tank, and a water passage and a water vapor passage are provided in the supply port. Therefore, when the cooling water in the cooling water tank boils and the cooling water expands, the boiling water and the water vapor passage are externally connected from the replenishing port. Can be prevented from jumping out at once. Further, when the cooling water is replenished into the cooling water tank from the replenishing port, even if the cooling water is replenished at once, the cooling water can be replenished smoothly by removing air from the steam passage.

  According to claim 2, since the cooling water overflow passage is provided below the upper end of the outlet of the water vapor passage, when the cooling water expands and overflows from the replenishing port, it flows into the overflow passage, Since the exit of the service passage is not blocked, sudden jumping out of boiling water from the replenishing port can be prevented. Further, the boiling water can be discharged in a desired direction by the overflow passage.

  According to a third aspect of the present invention, since the replenishing port body is formed in a cylindrical shape and the water vapor passage is provided around the upper portion of the replenishing port body, the inlet portion of the water vapor passage can be enlarged. Therefore, even when the cooling water in the cooling water tank boils and expands, or when the engine body is tilted in any direction, the passage for discharging water vapor is ensured without blocking the inlet part with the cooling water. Can be secured.

  In Claim 4, since the downward wall part was formed in the exit part of the water vapor | steam channel | path around the upper part of the said replenishment opening | mouth body, after bending the blowing of water vapor | steam below by a wall part, water vapor | steam is discharged | emitted from an exit. Therefore, it is possible to prevent water vapor from jumping out from the supply port at a stretch. In addition, a pool of water vapor and bubbles can be formed inside the wall portion, and the generated bubbles can be increased in mass to prevent small bubbles from staying at the outlet portion of the water vapor passage.

  According to a fifth aspect of the present invention, in the engine in which the cooling water tank is disposed above the cylinder or the crankcase, a cooling water supply port body is provided on the upper surface of the cooling water tank, and a seal mounting recess is formed on the lower peripheral surface of the supply port body. Since the communication groove is formed between the seal mounting recess and the overflow passage, water accumulated in the seal mounting recess can be discharged to the outside from the communication groove. Water can be discharged in a desired direction.

Next, embodiments of the invention will be described.
1 is a side view of a supply port according to an embodiment of the present invention, FIG. 2 is a side sectional view of the supply port, FIG. 3 is a perspective view of an upper body, FIG. 4 is a bottom view, and FIG. FIG. 6 is a perspective view of an annular body, and FIG. 7 is a side view of an engine.

  The engine 50 of the present embodiment is a water-cooled diesel engine, and the cooling water tank 1 is disposed above the cylinder 51 or the crankcase 52 of the engine 50 as shown in FIG. The cooling water tank 1 and the cooling water jacket arranged around the cylinder 51 are communicated to circulate the cooling water between the cooling water tank 1 and the cooling water jacket to cool the cooling water.

  As shown in FIGS. 1 and 2, an opening 1a is provided at the highest position on the upper surface of the cooling water tank 1, and a replenishing port 2 is attached to the opening 1a. The replenishing port body 2 has a replenishing port 11a that is opened substantially at the center of the upper surface, an upper body 10 having a water vapor passage 3 and a water passage 4 connected to the replenishing port, and bubbles in the water passage 4 of the upper body 10. The cooling water boiled, comprising a lower body 20 that prevents direct entry from below, and an annular body 30 that is disposed around the upper body 10 and the lower body 20 to prevent bubbles from entering from the side. Sometimes, water vapor and bubbles do not directly enter the replenishing port 11a, and the replenishing port 11a is filled with bubbles so that boiling water and water vapor do not suddenly jump out.

  And in the said replenishing port body 2, the channel | path 4 for water and the channel | path 3 for water vapor | steam with which the upper body 10 is provided are formed as mentioned later, and the channel | path of a cooling water tank is made separate from the channel | path of boiling water and water vapor | steam. When the inside cooling water boils and expands, the boiling water and water vapor are prevented from jumping out from the replenishing port 11a. Further, when the cooling water is replenished into the cooling water tank 1 from the replenishing port 2, even if the cooling water is replenished at once, the cooling water can be smoothly replenished by removing the air through the steam passage 3. I can do it.

  Hereinafter, the upper body 10, the lower body 20, and the annular body 30 of the replenishing port body 2 will be described in detail.

  As shown in FIGS. 2 and 3, the upper body 10 is composed of a support portion 11 and a cylindrical portion 12, and the support portion 11 is formed in a substantially square shape in plan view, and is replenished slightly to one side from the center. A mouth 11a is provided. The cylindrical portion 12 is provided so as to protrude downward from the periphery of the supply port 11a. An edge portion 13 extending in the horizontal direction is formed around the outer periphery of the support portion 11, holes 13 a are provided at appropriate portions (four corners in the present embodiment) of the edge portion 13, and the cylindrical portion 12 is formed in the opening portion 1 a. The holes 13a are aligned with the holes provided in the cooling water tank 1 in the state of being inserted from above, and the bolts 5 are inserted into these holes 13a and screwed, so that the support portion 11, that is, the upper body 10 is cooled. The tank 1 is fastened and fixed. A bank part 11d that rises upward along the outer periphery is formed inside the edge part 13, and a part of the bank part 11d is cut out to form an overflow passage 14 to be described later.

  Further, as shown in FIGS. 2 and 4, the periphery of the back surface of the support portion 11 is formed in a stepped shape when viewed in cross section, so that the support portion 11 has two steps so as to be positioned above the upper surface of the cooling water tank 1 inside the support portion 11. Recesses 11b and 11c are formed. Then, a space is formed between the recesses 11b and 11c, a hole 12a of the cylindrical portion 12 described later, and the upper portion of the annular body 30 to form the water vapor passage 3. By providing the steam passage 3 around the opening 1a of the cooling water tank 1 in this way, the inlet portion 3a of the steam passage 3 is enlarged, and the cooling water in the cooling water tank 1 boils. Even when the engine body is expanded or the engine body is tilted in any direction, it is possible to reliably secure a passage for discharging water vapor by preventing the cooling water from blocking the inlet portion 3a. Yes.

  The cylindrical portion 12 has a central upper opening as a replenishing port 11a, and projects downward from the periphery of the replenishing port 11a, and a lower portion thereof is disposed in the cooling water tank 1. On the side surface of the cylindrical portion 12, slit-shaped holes 12a that are long in the vertical direction are provided at predetermined intervals in the circumferential direction. The hole 12a of the cylindrical portion 12 serves as both the outlet of the steam passage 3 and the inlet / outlet of the water passage, so that the steam that has passed through the steam passage 3 can be discharged to the outside. Since the steam passage 3 is disposed around the replenishing port 11a, a part of the upper side of the tilt is always open regardless of the direction in which the engine body is tilted. The inside and outside communicate, so that boiling water does not suddenly jump out when boiling. Further, the lower end of the cylindrical portion 12 is closed as a bottom plate 12c, and a screw hole for screwing a screw 26 described later into a female screw portion 15 formed on the bottom plate 12c is formed in the vertical direction.

  A downward wall portion 12 b is formed on the outer periphery of the supply port 11 a of the support portion 11 around the upper portion of the cylindrical portion 12. The lower end of the wall portion 12b is positioned higher than the concave portion 11b, and constitutes the outlet portion 3b of the water vapor passage 3. Thus, after the water vapor flowing through the water vapor passage 3 along the lower surface of the support portion 11 and reaching the center portion is once bent downward, the water vapor passes through the hole 12a and is discharged from the replenishment port 11a. Prevents you from jumping out of the air. Furthermore, the recess 11c formed between the wall portion 12b and the bank portion 11d (on the water vapor passage 3 side) can be configured to form a pool of water vapor and bubbles, thereby increasing the mass of the generated bubbles. It is possible to prevent small bubbles from staying in the steam passage 3 and the replenishing port 11a.

  Further, a groove that is one step lower is formed on the upper surface of the support portion 11 from the replenishment port 11a toward the notch of the outer bank portion 11d, and the groove serves as an overflow passage 14 for cooling water. The bottom surface of the overflow passage 14 is disposed below the upper end of the hole 12a of the cylindrical portion 12 serving as the outlet of the water vapor passage 3, and when the cooling water expands and overflows from the hole 12a, the overflow passage 14 enters the overflow passage 14. It does not flow and block the outlet of the water vapor passage 3. In this way, a water vapor outlet is always secured to prevent sudden boiling water from jumping out. Further, the overflow passage 14 allows the boiling water to be discharged in a desired direction. That is, the water overflowing from the cooling water tank 1 disposed above the cylinder 51 reaches the electrical system of the engine 50 below, the intake portion, and the like so that it does not cause a failure so that it does not affect the water. The overflow passage 14 is positioned so as to discharge boiling water, and the replenishing port body 2 is attached to the cooling water tank 1.

  Further, as shown in FIG. 4, a seal mounting recess 13 b is formed on the lower surface of the edge portion 13 provided around the upper body 10 so as to be recessed upward. Further, a communication groove 13c is formed in the seal mounting recess 13b so as to communicate with the outside during mounting, and is disposed on the same straight line as the overflow passage 14. That is, the communication groove 13 c is formed on the lower surface of the edge 13 on the extension of the overflow passage 14. Thus, by forming the communication groove 13c between the seal mounting recess 13b and the overflow passage 14, water accumulated in the seal mounting recess 13b can be discharged to the outside from the communication groove 13c. The water can be discharged in a desired direction in the same direction according to No. 14.

  A float 16 is integrally attached to the replenishing port 2 so that the amount of cooling water can be easily understood. The float 16 includes a cylindrical floating body 17 and a rod body 18 for supporting the floating body 17, and the rod body 18 that supports the floating body 17 of the float 16 is supported by the support portion 11 of the upper body 10 so as to be movable up and down. ing. The floating body 17 of the float 16 is made of a synthetic resin, a hollow body, a foam, or the like having a specific gravity smaller than that of water, and moves up and down in the cooling water tank 1 according to the height position of the water surface. The height of the water surface (capacity of water in the cooling water tank) can be confirmed at the position of the upper end). In the present embodiment, the floating body 17 of the float 16 is disposed on the lower side of the lower body 20, and the lower body 20 and the floating body 17 are partially overlapped in plan view.

  Thus, when the cooling water tank 1 is filled with the cooling water, the float 16 rises in proportion to the amount, and when the cooling water is almost full, the upper surface of the floating body 17 collides with the lower outer peripheral surface of the lower body 20, and the rising of the floating body 17 stops. To do. If the cooling water is continuously filled, the water surface can be recognized from the replenishing port 11a, and the replenishment is stopped at an appropriate amount. At this time, the rod body 18 that supports the floating body 17 is kept in a state where the ascent is stopped so that the rod body 18 does not rise unnecessarily from the top surface of the replenishing port 2, that is, the cooling water tank 1. That is, even if the floating body 17 rises as the water level rises, the rod 18 is not raised to an unnecessarily high height, and is hooked on the protruding rod 18 or the engine 50 is disposed in the housing. In some cases, it does not interfere with other equipment. In addition, the float 16 is configured integrally with the replenishing port 2 in this way, so that assembly can be easily performed.

  As shown in FIGS. 2 and 5, the lower body 20 includes a disk-shaped base portion 21 and support plates 22 and 23. The support plate is disposed so as to intersect the upper surface of the base portion 21 at the center thereof. 22 and the support plate 23 are erected in a radial pattern. However, the number of support plates is not limited. An edge portion 24 having an inclined surface inclined obliquely upward is formed around the base portion 21 so as to have a dish shape so that the radius of the edge portion 24 is larger than the radius of the annular body 30 and smaller than the radius of the opening 1a. It is composed. Thus, the lower surface of the base 21 is configured above the lower body 20 so that the lower surface of the base 21 serves as a stopper for the float 16 while the peripheral lower surface of the base 21 guides bubbles in the cooling water generated at the time of boiling. Water vapor and bubbles are prevented from entering the inlet portion 4a of the water passage 4 to be solidified. When the replenishing port 2 after assembling the upper body 10, the lower body 20, and the annular body 30 is inserted from the opening 1a, the slope of the edge 24 serves as a guide, and the lower body is hardly caught. The replenishing port body 2 can be easily attached by inserting 20 and the annular body 30 into the cooling water tank 1.

  The upper portions of both end portions of the support plates 22 and 23 are formed in a step shape, and the step portions 22a and 23a are configured to have the same radius and the same height so that the bottom portion 36 of the annular body 30 is fitted and supported. ing. Thus, a space is formed between the upper surface of the base portion 21 and the bottom portion 36 to constitute the inlet portion 4 a of the water passage 4. Furthermore, it can be circulated from the space of the support plate 22 and the support plate 23 to the space on the center side of the bottom portion 36. Further, the step portions 22 a and 23 a also serve as positioning members for the annular body 30.

  Further, a boss 25 is integrally formed in the middle portion in the longitudinal direction of one support plate 22, and the boss 25 is formed in a screw hole of the female screw portion 15 provided on the bottom plate 12 c of the cylindrical portion 12 of the upper body 10. In addition, screws 26 are inserted into these holes from below, and the lower body 20 is fastened and fixed to the upper body 10. The boss 25 can be provided at an arbitrary position on the base portion 21, but also serves as a reinforcement by being integrally formed with the support plate 22. However, the number of the bosses 25 is not limited.

  As shown in FIGS. 2 and 6, the annular body 30 includes an upper frame portion 31, a lower cylindrical portion 32, and a partition plate 33 provided in the horizontal direction between the frame portion 31 and the cylindrical portion 32. Consists of. An opening 33a is provided in the central portion of the partition plate 33 so as to be concentric with the supply port 11a provided in the upper body 10, and the cylindrical portion 32 projects downward from the periphery of the opening 33a. ing. The radius of the cylindrical portion 32 is larger than the radius of the cylindrical portion 12 of the upper body 10, a predetermined space is formed between them, and the cylinder of the annular body 30 is formed in the cylindrical portion 12 of the upper body 10. The shape part 32 is configured to be fitted outside. Further, the frame-shaped portion 31 is erected in a rectangular tube shape along the periphery slightly inside from the outer periphery of the partition plate 33. The frame-shaped portion 31 is shaped to match the outer shape of the upper body 10 so that it can be inserted into the recess 11c.

  Further, the periphery of the partition plate 33 outside the frame-shaped portion 31 is formed as an edge 34, and the locking plates 35, 35... Are provided at predetermined intervals on the upper surface of the edge 34 and the outer surface of the frame-shaped portion 31. In the vertical direction. The upper and outer sides of the locking plate 35 are formed in accordance with stepped recesses 11b and 11c formed around the back surface of the support portion 11 of the upper body 10, and when the annular body 30 is assembled to the upper body 10 from below, The step portion 35a is locked and positioned in the recess 11b, and a predetermined space is formed between the outer periphery of the annular body 30 and the inner surface of the upper body 10. In this way, a predetermined labyrinth-like space is formed between the edge portion 34 and the frame-like portion 31 of the annular body 30 and the concave portions 11b and 11c of the upper body 10 to constitute the water vapor passage 3. In addition, the height of the upper end of the frame-shaped part 31 is set lower than the height of the lower end of the said wall part 12b.

  On the other hand, a ring-shaped bottom portion 36 is formed on the horizontal center side from the lower end of the cylindrical portion 32, an opening 36a is provided at the center of the bottom portion 36, and the lower body 20 is inserted into the opening 36a. The bottom portion 36 of the cylindrical portion 32 is supported by the step portions 22a and 23a of the support plates 22 and 23. The space between the cylindrical portion 32 of the annular body 30 and the cylindrical portion 12 of the upper body 10 is formed between the opening portion 36a and the base portion 21 and the bottom portion 36 as an inlet portion 4a of the water passage 4. Thus, the water passage 4 is configured.

  Then, the cylindrical portion 12 of the upper body 10 is inserted into the frame-shaped portion 31 and the cylindrical portion 32 of the annular body 30, and the support portion 11 of the upper body 10 is engaged with the locking plate 35 of the edge 34 of the annular body 30. In addition, the lower body 20 is inserted into the opening 36a of the cylindrical portion 32 of the annular body 30 and the bottom portion 36 is supported by the support plates 22 and 23. In this state, the boss 25 of the lower body 20 is attached to the upper body 10. The lower body 20 is fastened and fixed to the upper body 10 by inserting screws 26 from below into the holes in accordance with the female screw portion 15, and the annular body 30 is sandwiched between the upper body 10 and the lower body 20 accordingly. It can be fixed. In this way, the replenishing port body 2 can be simply assembled from the upper body 10, the lower body 20 and the annular body 30.

  In such a configuration, the cooling water tank 1 is filled with a predetermined amount of cooling water from the replenishing port 11a before the engine 50 is started. At this time, the cooling water passes through the slit-shaped hole 12a from the replenishing port 11a, and is between the cylindrical portion 12 and the annular body 30, between the opening portion 36a, the base portion 21 and the bottom portion 36, so-called water passage 4. And enters the cooling water tank 1.

  When the engine 50 is activated and the cooling water is heated and boiled, the volume of the cooling water increases and the water surface rises. When the water reaches the height of the supply port 11a, the cooling water is discharged from the overflow passage 14 to the outside of the machine. Will be. Further, bubbles generated almost simultaneously with boiling in the cooling water rise, and at this time, the bubbles do not enter the water passage 4 by the lower body 20, and between the periphery of the edge 34 of the annular body 30 and the opening 1a. Enters the recess 11c from the inlet portion 3a of the steam passage 3. Small bubbles are combined and become large, and are discharged from the wall 12b through the supply port 11a to the outside of the apparatus. At this time, since the lower end of the wall portion 12b of the upper body 10 is higher than the lower surface of the overflow passage 14, the overflowing cooling water does not obstruct the discharge of bubbles and the replenishing port 11a is not blocked. The boiling water does not suddenly jump out of the supply port 11a.

The side view of the supply port body which concerns on one Example of this invention. The side sectional view of a supply mouth similarly. The perspective view of an upper body. Similarly bottom view. The perspective view of a lower body. The perspective view of an annular body. The side view of an engine. Side surface sectional drawing of the conventional replenishment port body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling water tank 2 Supply port body 3 Passage for water vapor | steam 4 Passage for water 12b Wall part 13b Recess for seal attachment 13c Communication groove 14 Overflow passage

Claims (5)

  An engine in which a cooling water tank is disposed above a cylinder or a crankcase is characterized in that a cooling water supply port is provided on the upper surface of the cooling water tank, and a water passage and a water vapor passage are formed in the supply port. Engine.   The engine according to claim 1, wherein an overflow passage for cooling water is provided below an upper end of an outlet of the passage for water vapor.   2. The engine according to claim 1, wherein the supply port body is formed in a cylindrical shape, and the water vapor passage is provided around an upper portion of the supply port body.   The engine according to claim 3, wherein a downward wall portion is formed at an outlet portion of a water vapor passage around the upper portion of the replenishing port body. In an engine in which a cooling water tank is disposed above a cylinder or a crankcase, a cooling water replenishing port is provided on the upper surface of the cooling water tank, and a seal mounting recess is formed on a lower surface around the replenishing port. An engine characterized in that a communication groove is formed between the recess for use and the overflow passage.

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