JP6761826B2 - Internal combustion engine - Google Patents

Description

The present invention relates to an internal combustion engine, and is particularly characterized in a control mode of the flow of cooling water.

In an internal combustion engine, the Linda head and the block jacket are cooled by cooling water, but when operating in a low temperature environment such as during a cold start, cooling the block jacket may cause overcooling. Therefore, a two-system cooling system has been proposed in which only the cylinder head is controlled to be cooled during the warm-up operation.

As an example, in Patent Document 1, the applicant of the present application provides two passages, an inflow passage communicating with the jacket of the thin lida block and an inflow passage communicating with the jacket of the cylinder head, on one longitudinal side surface of the thin lida block. It is disclosed that a control valve is provided in each passage by forming the opening so as to open sideways.

Japanese Unexamined Patent Publication No. 2015-190350

Patent Document 1 conceptually shows the control of the flow of cooling water to the thin lidar block and the cylinder head, and there is still a prediction of improvement in practical use. For example, in Patent Document 1, the inflow passage toward the thin lidar block and the inflow passage toward the cylinder head are such that cooling water flows from a water supply passage arranged outside the thin lidar block, but the internal combustion engine is compact. It is preferable to form the water supply passage inside the thin lidar block in order to reduce the cost by reducing the number of members and the number of members.

In addition, the cooling water flows in the water supply passage in the direction of the crank axis, then changes its direction in the direction orthogonal to the crank axis and flows into the inflow passage, but there is a problem that the pressure loss increases when the flow direction changes suddenly. It is also necessary to smooth the flow of cooling water.

The present invention has been made in view of such a current situation, and is intended to provide an improved cooling structure.

The present invention includes various configurations, and a typical example thereof is specified in each claim. Of these, the invention of claim 1 is
"It is equipped with a cylinder block in which a block jacket through which cooling water flows so as to surround a group of cylinder bores is closed upward, and a cylinder head in which a head jacket through which cooling water flows is formed inside, and cooling is pumped by a water pump. Water flows to the block jacket and head jacket,
Parallel to said cylinder block, said block thermo chamber thermo valve arranged to control the flow of cooling water to the cooling water flow and head jacket to jacket, a crank axis of the outer peripheral portion of the cylinder block It is formed in a horizontal hole shape so as to open toward one long side surface.
In the thermo chamber, a cooling water inlet hole communicating with the discharge port of the water pump is formed so as to close in a direction parallel to the crank axis, and a cooling water outlet hole communicates in the inner part. Moreover, the thermo chamber is closed by a lid arranged on the side of one longitudinal side surface of the cylinder block. "
In the basic configuration
"On the lid body, projecting in a state in which a gap between the front Symbol coolant cooling water flowing from the inlet hole rectifying guide part causes redirecting toward the inner portion, the inner peripheral surface of the thermo chamber The rectifying guide portion is formed in a U shape that closes toward the cooling water inlet hole when viewed from the axial direction of the thermo chamber, and the inner surface of the rectifying guide portion and the inner surface of the lid plate. The part connected with is formed on the curved surface. "
The configuration is added.

The invention of claim 2 has the same basic configuration as that of claim 1.
"By shifting the axis of the thermo chamber and the axis of the cooling water inlet hole in the vertical direction, it is allowed to generate a swirling flow of cooling water in the thermo valve."
It is configured as.

As an example of the development of claim 2, claim 3
"While the axis of the cooling water inlet hole is located above the axis of the thermo chamber,
The thin lidar block is formed so that a water supply passage communicating with the discharge port of the water pump and the cooling water inlet hole of the thermo chamber extends in the direction of the crank axis, and the discharge port of the water pump is the water supply port. Located below the aisle,
It is set so that the cooling water discharged from the discharge port of the water pump flows upward and then changes direction toward the cooling water inlet hole. "
It is configured as.

In claim 4, as an example of development of claim 2 or 3,
"The lid is formed so that the pin that holds and holds the thermo valve and the cooling water outlet that takes out a part of the cooling water to the outside are displaced vertically, and the cooling water outlet is formed. It is formed on the opposite side of the cooling water inlet hole across the axis of the thermo chamber. "
It is configured as.

It is essential that the thermo chamber is open toward one longitudinal side of the thin lidar block to insert the thermovalve, and therefore a lid that closes the thermochamber is also required. Then, in the invention of claim 1, since the cooling water is smoothly changed in direction by using the lid that closes the thermo chamber, the pressure loss of the flow of the cooling water can be reduced without increasing the number of members. Therefore, it is possible to improve fuel efficiency by reducing pressure loss while suppressing costs as much as possible.

As the rectifying guide unit, it is possible to provide a flat plate-shaped warp plate inclined with respect to the axis of the thermo chamber, but as in claim 1 , the rectifying guide unit is directed toward the cooling water inlet hole. As a basic form of the closed U-shape, it is preferable to form a curved surface where the inner surface of the rectifying guide portion and the inner surface of the lid are connected, because the guide function of the cooling water flow can be improved.

In claim 2, by shifting the axis of the thermo chamber and the axis of the cooling water inlet hole in the vertical direction, a swirling flow (vortex flow) of cooling water is generated in the thermo valve, but the cooling water is the thermo chamber. By turning, the flow becomes smoother, and the direction can be changed while suppressing pressure loss. Therefore, as in claim 1, the improvement of fuel efficiency by reducing the pressure loss can be realized in a state where the cost is suppressed.

Further, in claim 2, since the kinetic energy of the cooling water is scraped by swirling the thermo chamber, it is possible to prevent the cooling water from flowing into the block jacket vigorously. As a result, it is possible to prevent or significantly suppress the block jacket from being partially supercooled. As a result, it is possible to suppress the non-uniformity of the heat distribution of the thin lidar block and prevent an increase in the sliding resistance of the piston. In this respect as well, it can contribute to the improvement of fuel efficiency.

A thermo valve is arranged in the thermo chamber, and the thermo valve acts as a resistance to the flow of cooling water. Then, in claim 2, since the cooling water swirls and flows inside the thermo chamber, the cooling water tends to flow while swirling around the axis of the thermo valve. Therefore, the pressure loss due to the collision with the thermo valve can be remarkably suppressed, and the cooling water hits the thermo valve evenly in a state where the temperature is made uniform by stirring. Therefore, the thermo valve can be operated accurately according to the temperature. This point is also an advantage of claim 2.

Claims 1 and 2 are not contradictory to each other, and by combining them, the effects of each other can be improved. That is, the rectifying guide unit according to claim 1 can function as a member for generating a swirling flow. In other words, the rectifying guide unit can retain the function of smoothing the direction change and the function of generating the swirling flow.

In the configuration of claim 3, the cooling water discharged from the water pump is given a direction so as to face upward and is ejected from the water supply passage into the thermo chamber, so that the function of generating a swirling flow can be further improved. In this case, if the side of the lower surface of the water supply passage that is closer to the discharge port of the water pump is curved as in the embodiment, the cooling water can be smoothly flowed from the discharge port of the water pump to the water supply passage, which is particularly preferable. Is.

Unlike claim 3, it is also possible to arrange the discharge port of the water pump above the water supply passage, in which case the outlet of the water supply passage (cooling water inflow hole of the thermo chamber) is the shaft of the thermo chamber. When located below the heart, a swirling flow can be generated.

In an internal combustion engine, it is widely practiced to cool the thin lidar block and other members of the cylinder head with cooling water. For example, the turbocharger is water-cooled. The cooling water for cooling the turbocharger is preferably as low as possible, and therefore the cooling water for the turbocharger is preferably taken out before flowing to the thin lidar block and the cylinder head.

In this regard, if the configuration of claim 4 is adopted, the cooling water for a turbocharger or the like can be taken out by using the cooling water outlet formed on the lid, so that the number of members can be suppressed and the cost can be reduced. Can contribute.

Further, since the cooling water outlet is formed on the opposite side of the cooling water inlet hole with the axial center of the thermo chamber sandwiched, the function of generating a swirling flow can be further improved. That is, in the configuration of claim 4, since the pressure drops on the side opposite to the cooling water inlet hole across the axis of the thermo chamber, the action of pulling the cooling water to the opposite side to the cooling water inlet hole occurs, and the cooling water becomes , The direction of turning around the axis of the thermo chamber is strongly imparted, which makes it possible to further improve the function of generating a swirling flow (vortex flow) and improve the smoothness of the flow of the cooling water.

(A) is a separate perspective view of the thin lida block and the lid, and (B) is a perspective view of the lid as viewed from the front (in (A), the lid is displayed larger than the scale of the thin lida block. ing.). (A) is a front view of a main part of the thin lidar block, and (B) is a front view of a cover housing constituting a water pump. There is a side view of the main part of the Shinrida block. (A) is a plan view of a main part of the thin lida block, and (B) is a sectional view taken along line IVB-IVB of FIG. 3 (in (A), the shaded portion is the upper surface of the thin lida block. .). FIG. 4A is a sectional view taken along line VA-VA in FIG. 4B, and FIG. 4B is a sectional view taken along line VB-VB in FIG. 4B. FIG. 4B is a sectional view taken along line VI-VI of FIG. 4B. 6 is a sectional view taken along line VII-VII of FIG.

Next, an embodiment of the present invention will be described with reference to the drawings. In the following, the front-back and left-right words are used to specify the direction, but the crank axis direction is the front-back direction based on the general name of the internal combustion engine. To be precise, the side where the timing chain is arranged is the front.

The left-right direction is a direction orthogonal to the crank axis and the cylinder bore axis. As a precaution, the direction is clearly shown in FIG. The vertical direction is defined as the cylinder bore axis direction. Therefore, in the case of a slant type internal combustion engine, the vertical direction and the vertical direction are different.

(1). Outline The internal combustion engine of the present embodiment has three cylinders. Therefore, as shown in FIG. 1, three cylinder bores 2 are formed in a row in the thin lidar block 1. A block jacket 3 that surrounds a group of cylinder bores 2 is opened upward in the thin lidar block 1.

Further, the pump hounding 5 forming a part of the water pump 4 is moved to the right side from the exhaust side surface 1b at a portion of the front surface (one end surface) 1a of the thin lidar block 1 closer to the exhaust side surface (longitudinal one side surface) 1b. It is formed so as to partially protrude. The pump hounding 5 forms a vortex chamber 6 in which an impeller (not shown) is arranged.

An upward discharge passage 7 communicates with the vortex chamber 6, and the upper end of the discharge passage 7 serves as a discharge port 7a. Further, the end of the horizontal return passage 8 communicates with the lower part of the vortex chamber 6. The horizontal return passage 8 is formed in the thick portion of the thin lidar block 1 and is formed parallel to the crank axis. At the rear end of the thin lid block 1, a vertically long return passage 9 communicating with the horizontal return passage 8 is formed so as to open upward.

The cooling water that has cooled the cylinder head 10 is returned to the reflux passages 9 and 8 via the control unit unit that controls water flow to the radiator, etc., and through the vertically long passage formed in the cylinder head 10, and is returned to the water pump. It is pumped at 4.

A first cooling water outlet hole 11 that opens upward is formed in a portion of the upper surface of the thin lida block 1 that is closer to the exhaust side surface 1b, and a first cooling water outlet is formed on the exhaust side surface 1b of the thin lida block 1. A horizontal hole-shaped thermo chamber 12 separated from the hole 11 is formed. As shown in FIG. 7, a second cooling water outlet hole 12b communicating with the block jacket 3 is continuous in the inner part of the thermo chamber 12.

As shown in FIGS. 4 (A) and 6 (A) and FIG. 6, the thermo chamber 12 is formed in a circular shape in a side view (the second cooling water outlet hole 12b communicating with the block jacket is formed in a vertically elongated oval shape ) . .. About half of the opening of the thermo chamber 12 has a circular cross section, and a boss portion 13 is formed so as to surround the thermo chamber 12. In this boss portion 13, a lid 14 for closing the thermo chamber 12 is bolted 14 a. It is fixed at (see FIG. 7).

For example, as shown in FIG. 1, the lid 14 has a centerpiece shape having flanges protruding vertically from a disk portion that closes the thermo chamber 12, and both upper and lower ends are bolted (not shown). It is fixed to the boss portion 13. A U-shaped (horseshoe-shaped) rectifying guide portion 15 that is closed toward the front is projected inward on the inner surface of the lid 14 . As shown in FIGS. 5 (B), 6 and 7, there is a space between the outer peripheral surface of the rectifying guide unit 15 and the inner peripheral surface of the thermo chamber 12.

As is clearly shown in FIG. 5A, the center of the radius of curvature of the rectifying guide portion 15 coincides with the center of the lid 14 and the axis 12a of the thermo chamber 12. Further, the inner surface of the rectifying guide portion 15 and the inner surface of the lid 14 are continuous by a smooth curved surface as if a fillet is attached. In other words, the inner surface of the rectifying guide portion 15 and the inner surface of the lid 14 are continuous via a curved surface (guide surface) 16 having a large radius. The degree of curvature of the curved surface 16 is the largest in the upper and lower middle parts, and is divided into upper and lower ends and becomes smaller (the degree of curvature may be the same over the entire upper and lower parts).

A pin 19 for holding and holding the thermo valve 18 (see FIG. 7) is projected inward at a position slightly below the center of the thermo chamber 12 on the inner surface of the lid 14. Further, a cooling water outlet 20 for taking out a part of the cooling water to the outside of the lid 14 is opened at a portion slightly below the pin 19 and slightly in front of the pin 19. A tubular portion 20a communicating with the cooling water outlet 20 is integrally formed on the lid body 14, and a hose (shown) is connected to the tubular portion 20a. The cooling water taken out from the cooling water outlet 20 is sent to, for example, a turbocharger (may be sent to other coolers).

(2). Cooling water flow structure As shown in FIGS. 4 (B) and 6, a water supply passage 21 for communicating the discharge port 7a of the water pump 4 and the thermo chamber 12 is provided in the cylinder block 1 in the front-rear direction. It is formed so as to extend to. Therefore, in the thermo chamber 12, a cooling water inflow hole 22 communicating with the water supply passage 21 is opened toward the front.

As shown in FIG. 6, the axial center 21a of the water supply passage 21 is located slightly above the axial center 12a of the thermo chamber 12. Further, the portion of the lower surface 21b of the water supply passage 21 that is closer to the discharge port 7a is curved so as to be lower toward the discharge port 7a. Alternatively, it may be said that the lower surface of the communication portion between the discharge passage 7 and the water supply passage 21 is curved so as to be recessed toward the rear lower side (since the boundary between the discharge passage 7 and the water supply passage 21 is not always clear). .).

As shown in FIGS. 3 and 4, the cover housing 23 constituting the water pump 4 is fixed to the pump hounding 5. The front view shape of the cover housing 23 is clearly shown in FIG. 2 (B). As shown in FIGS. 3 and 4 (A), a rotating shaft having a pulley 24 fixed to one end thereof is rotatably arranged in the cover housing 23, and is arranged in a vortex chamber 6 at the other end of the rotating shaft. The impeller is fixed. In FIG. 2, the impeller rotates counterclockwise. The discharge passage 7 of the water pump 4 is also composed of a cover housing 23.

As described above, the first cooling water outlet hole 11 is formed on the upper surface of the thin lidar block 1, and the lower half of the first first cooling water outlet hole 11 and the thermo chamber 12 communicate with each other. As shown in FIG. 4A, the first and first cooling water outlet holes 11 have a wide front-rear width on the front side and a trapezoidal shape on the rear side.

4 to 7 show a relay passage 26 for communicating the first cooling water outlet hole 11 and the jacket (head jacket) of the cylinder head 10. The relay passage 26 is shown in FIG. 4 (? As shown by the parallel diagonal lines of the one-point chain line in A), it communicates with a certain part of the first cooling water outlet hole 11 located on the front side, and communicates with the entire first cooling water outlet hole 11. Absent.

A notch groove 27 for flowing cooling water from the first cooling water outlet hole 11 to the block jacket 3 is formed in the rear portion of the partition wall that separates the block jacket 3 and the first cooling water outlet hole 11. Therefore, the notch groove 27 is located behind the relay passage 26 of the cylinder head 10. Reference numeral 28 shown in FIG. 5 is a gasket, and the portion of the relay passage 26 is hollowed out.

As shown in FIGS. 4 (A) and 4 (B), the front end of the first cooling water outlet hole 11 is displaced toward the front of the front end of the thermo chamber 12, and as shown in FIGS. 4 (B) and 6 A bypass passage 29 communicating with the water supply passage 21 and the first cooling water outlet hole 11 is formed on the front side of the thermo chamber 12 in the lidar block 1.

As shown in FIG. 5B, the front side portion of the first cooling water outlet hole 11 is deep, and the bypass passage 29 communicates with this deepened portion. On the other hand, the portion of the first cooling water outlet hole 11 located above the thermo chamber 12 is shallow and does not communicate with the thermo chamber 12. That is, the inner portion of the thermo chamber 12 is arranged below the shallow portion of the first cooling water outlet hole 11. Therefore, as described above, the first cooling water outlet hole 11 and the thermo chamber 12 are separated by a partition wall.

In a state where the thermo chamber 12 is blocked, the cooling water flows in the first cooling water outlet hole 11 through the bypass passage 29, in a state in which no thermo chamber 12 is blocked, a part of the cooling water Flows into the bypass passage 29 first cooling water outlet hole 11, and the remaining portion of the cooling water flows from the thermo chamber 12 to the block jacket 3 via the second cooling water outlet hole 12b.

Further, the cooling water that has flowed into the first cooling water outlet hole 11 is divided into a portion that flows to the head jacket via the relay passage 26 and a portion that flows to the block jacket 3 through the notch groove 27, but the bypass passage 29 Since the cooling water is displaced toward the front side, most of the cooling water that has flowed into the first cooling water outlet hole 11 flows into the head jacket from the relay passage 26 because the cooling water has straightness.

Further, since the bypass passage 29 communicates with the deep portion of the first cooling water outlet hole 11, the cooling water flowing into the bypass passage 29 changes the flow direction upward at the first cooling water outlet hole 11 and is a relay passage. It flows into 26. That is, when the cooling water changes its flow direction upward at the first cooling water outlet hole 11, the relay passage 26 is located in the forward direction of the cooling water. As a result, the cooling water is smoothly poured into the relay passage 26.

A part of the cooling water that has flowed into the first cooling water outlet hole 11 flows into the block jacket 3 from the notch groove 27, but the flow rate ratio can be arbitrarily set by adjusting the area of the notch groove 27.

On the other hand, when the thermo chamber 12 is open, the cooling water is directed so as to go straight through the water supply passage 21, so that a considerable proportion of the cooling water is passed through the thermo chamber 12 to the first cooling water outlet. It flows into the hole 11 and flows into the block jacket 3. Further, even when the thermo chamber 12 is open, the cooling water flows into the bypass passage 29, so that the cooling water slightly flows into the block jacket 3 from the notch groove 27.

(3). Thermo valve In FIG. 7, the thermo valve 18 for controlling the flow of cooling water to the thermo chamber 12 is displayed (in FIGS. 1 to 6, the thermo valve 18 is displayed because the drawing becomes complicated. Not.). The thermo valve 18 has a central shaft 32, a slide cylinder 33 slidably fitted therein, and a temperature-sensitive portion 34 for sliding the slide cylinder 33. The temperature-sensitive portion 34 has a composite structure, and moves on the central axis 32 integrally with the slide cylinder 33 due to expansion and contraction of the built-in wax.

A ring-shaped valve seat 35 is fixed to the central shaft 32, and the valve seat 35 is in contact with the step portion 36 formed in the thermo chamber 12. Further, a front cage 37 having a hole for allowing water to pass through is fixed to the valve seat 35 whose top surface abuts on the pin 19, and the central shaft 32 abuts on the inner surface of the front cage 37 via the spacer 38. ing. As a result, the thermo valve 18 is held in the thermo chamber 12 so as not to be displaced.

A rear cage 39 that allows water to flow toward the inner part of the thermo chamber 12 is fixed to the valve seat 35, and the temperature sensitive portion 34 is slidably fitted in the central cylinder provided in the rear cage 39. A valve body 40 that opens and closes the valve seat 35 is fixed to the slide cylinder 33, and a spring 41 is interposed between the valve body 40 and the rear cage 39.

When the temperature of the cooling water rises above a predetermined level, the wax contained in the temperature sensitive portion 34 expands, so that the temperature sensitive portion 34 and the slide cylinder 33 move to the left in FIG. 7 against the spring 41. .. As a result, the valve body 40 retracts, and as described above, the cooling water flows into the block jacket 3 via the second cooling water outlet hole 12b. The amount of cooling water passing through is proportional to the amount of retreat of the valve body 40. As described above, the pin 19 is arranged so as to be slightly below the axis 12a of the thermo chamber 12. Therefore, the axial center 18a of the thermo valve 18 is also slightly located with respect to the axial center 12a of the thermo chamber 12.

(4). Summary Although it overlaps with the above, when the temperature of the cooling water is lower than the preset value as in the case of cold start, the thermo chamber 12 is blocked by the thermo valve 18. All of the cooling water discharged from the water pumps 4 or 3 flows into the first cooling water outlet hole 11 through the bypass passage 29, and most of the cooling water flows into the head jacket through the relay passage 26. Therefore, supercooling of the thin lidar block 1 can be prevented, and early temperature rise of the cooling water can be promoted, which can contribute to shortening the warm-up time.

When the temperature of the cooling water rises to a set temperature, the valve body 40 of the thermo valve 18 starts to retreat, the cooling water starts to flow from the thermo chamber 12 into the second cooling water outlet hole 12b, and also into the block jacket 3. It will flow in. As a result, the thin lidar block 1 can be appropriately cooled. Although not shown, the cooling water flows into the head jacket via the block jacket 3.

When the thermo valve 18 is fully opened, most (or a considerable part) of the cooling water flows into the block jacket 3 and then into the head jacket. The turbocharger is cooled regardless of the temperature of the cooling water.

Then, when the thermo valve 18 is open, as shown in FIG. 4 (B), the cooling water flowing backward through the water supply passage 21 changes its direction to the left and right in the thermo chamber 12, but the flow of the cooling water Is guided by the curved surface 16 of the rectifying guide unit 15, so that the direction change is performed very smoothly. As a result, the flow resistance (pressure loss) of the cooling water can be significantly reduced.

Further, as is clearly shown in FIG. 6, in the present embodiment, since the axial center 21a of the water supply passage 21 is located above the axial center 12a of the thermo chamber 12, the water flows into the thermo chamber 12 from the water supply passage 21. The cooling water has a clockwise swirling flow in FIG. This also reduces the momentum of the cooling water and can significantly reduce the pressure loss. That is, the pressure loss can be remarkably reduced by the synergistic effect of the rectifying guide function by the rectifying guide unit 15 and the guide function by applying the swirling flow. Therefore, it can contribute to the improvement of fuel efficiency.

Further, since the axial center 18a of the thermo valve 18 is located slightly below the axial center 12a of the thermo chamber 12, the thermo valve 18 does not act to inhibit the generation of the swirling flow, and the arrow in FIG. As shown by, in the thermo chamber 12, a swirling flow around the axis of the thermo valve 18 is generated. Therefore, the cooling water can be evenly applied to the temperature sensitive portion 34 of the thermo valve 18 to make the operation of the thermo valve 18 accurate. The temperature of the cooling water becomes uniform due to the stirring effect caused by the swirling of the cooling water, which also improves the accuracy of the operation of the thermo valve 18.

In the embodiment, since the axis 21a of the water supply passage 21 is located above the axis 18a of the thermo valve 18, for example, in the state of FIG. 5B, the cooling water turns clockwise. When the axial center 21a of the water supply passage 21 is positioned below the axial center 18a of the thermo valve 18, the turning direction of the cooling water is reversed, and the cooling water is directed toward the notch groove 27.

As shown in FIG. 6, when at least the portion of the lower surface 21b of the water supply passage 21 that is closer to the discharge passage 7 is curved, the cooling water that has flowed upward through the discharge passage 7 smoothly changes direction and flows into the water supply passage 21. Therefore, it is possible to reduce pressure loss and contribute to improvement of fuel efficiency.

Further, since the cooling water flowing into the water supply passage 21 is given an upward direction, if the axis 21a of the water supply passage 21 is positioned above the axis 12a of the thermo chamber 12 as in the embodiment. , It can be said that the function of generating the swirling flow in the thermo chamber 12 is further improved. As shown by the alternate long and short dash line in FIG. 6, if the water supply passage 21 is inclined so as to increase in height from the start end to the end, the swirling flow generation function in the thermo chamber 12 can be further improved.

In Patent Document 1, control valves are provided in each of the two passages, but in the present embodiment, the cooling water mainly flows through the cylinder head 10 and the block jacket 3 by one thermo valve 18. Since it can be switched to the state, there is an advantage that the structure can be simplified even though it is a two-system cooling system.

The thermo valve 18 can also be configured to switch between the flow to the relay passage 26 and the flow to the block jacket 3. That is, it is also possible to open and close the bypass passage 29 by the thermo valve 18.

The invention of the present application can be embodied in an internal combustion engine. Therefore, it can be used industrially.

1 Shinrida block 1a Front end face (one end face)
1b Exhaust side surface (longitudinal one side)
2 Cylinder bore 3 Block jacket 4 Water pump 5 Pump housing 6 Water pump vortex chamber 7 Discharge passage 7a Discharge port 8, 9 Reflux passage 10 Cylinder head 11 1st cooling water outlet hole 12 Thermo chamber 12a Thermo chamber axis 12b 2nd Cooling water outlet hole (cooling water outlet hole in the thermo chamber)
14 Lid 15 Rectifying guide 16 Curved surface 18 Thermo valve 19 Pin for holding the thermo valve 20 Cooling water outlet 21 Water supply passage 22 Cooling water inflow hole 23 Cover housing 26 Relay passage 32 Thermo valve central axis 34 Temperature sensitive part 35 valve Seat 40 valve body

Claims (4)

It is equipped with a cylinder block in which a block jacket through which cooling water flows so as to surround a group of cylinder bores is closed upward, and a cylinder head in which a head jacket through which cooling water flows is formed inside, and cooling water pumped by a water pump is provided. Is flowing to the block jacket and the head jacket.
Parallel to said cylinder block, said block thermo chamber thermo valve arranged to control the flow of cooling water to the cooling water flow and head jacket to jacket, a crank axis of the outer peripheral portion of the cylinder block It is formed in a horizontal hole shape so as to open toward one long side surface.
In the thermo chamber, a cooling water inlet hole communicating with the discharge port of the water pump is formed so as to open in a direction parallel to the crank axis, and a cooling water outlet hole communicates in the inner part. Moreover, the thermo chamber is closed by a lid arranged on the side of one longitudinal side surface of the cylinder block.
The lid, the front Symbol rectification guide portion cooling water flowing from the cooling water inlet hole causes redirecting toward the inner portion, projecting in a state in which a gap between the inner peripheral surface of the thermo chamber The rectifying guide portion is formed in a U shape that closes toward the cooling water inlet hole when viewed from the axial direction of the thermo chamber, and also includes the inner surface of the rectifying guide portion and the inner surface of the lid plate. Form a curved surface at the part where
Internal combustion engine. It is equipped with a Shinrida block in which a block jacket through which cooling water flows so as to surround a group of cylinder bores is opened upward, and a cylinder head in which a head jacket through which cooling water flows is formed inside, and cooling is pumped by a water pump. Water flows to the block jacket and head jacket,
A thermo chamber in which a thermo valve for controlling the flow of cooling water to the block jacket and the flow of cooling water to the head jacket is arranged in the thin lidar block is a crank axis of the outer peripheral portion of the thin lidar block. It is formed in a horizontal hole shape so as to open toward one side surface parallel to the length.
In the thermo chamber, a cooling water inlet hole communicating with the discharge port of the water pump is formed so as to open in a direction parallel to the crank axis, and a cooling water outlet hole communicates in the inner part. Moreover, the thermo chamber is closed by a lid arranged on one side surface of the longitudinal side of the Shinrida block.
By shifting the axis of the thermo chamber and the axis of the cooling water inlet hole in the vertical direction, it is allowed that a swirling flow of cooling water is generated in the thermo valve.
Internal combustion engine. While the axis of the cooling water inlet hole is located above the axis of the thermo chamber,
The thin lidar block is formed so that a water supply passage communicating with the discharge port of the water pump and the cooling water inlet hole of the thermo chamber extends in the direction of the crank axis, and the discharge port of the water pump is the water supply port. Located below the aisle,
It is set so that the cooling water discharged from the discharge port of the water pump flows upward and then changes its direction toward the cooling water inlet hole.
The internal combustion engine according to claim 2. The lid is formed so that the pin that holds and holds the thermo valve and the cooling water outlet that takes out a part of the cooling water to the outside are displaced vertically, and the cooling water outlet is the said. It is formed on the opposite side of the cooling water inlet hole across the axis of the thermo chamber.
The internal combustion engine according to claim 2 or 3.

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