JPH063128Y2 - Oil cooler for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an oil cooler for cooling engine lubricating oil in a marine diesel engine, etc.
The target is a water-cooled oil cooler equipped with a thermostat and a bypass oil passage.

[Prior Art] This main oil cooler is disclosed, for example, in Japanese Utility Model Publication No. 61-41.
931 gazette. In that structure, a passage is formed along the outer surface of the elongated oil cooler body, and the cooling water is sent to the bypass passage by the action of the thermostat in the warm-up operation state, etc. As described above, in the warm-up operation, the temperature of the oil can be raised to a predetermined value in a short time, so that there is an advantage that the warm-up operation time can be shortened.

[Problems to be Solved by the Invention] However, in the structure described in the above publication, the inlet and outlet of the bypass passage are located at both longitudinal ends of the oil cooler, and the bypass passages are juxtaposed over substantially the entire length of the oil cooler body. ing. Therefore, it is inevitable that the oil flowing through the bypass passage is cooled by the cooling water through the wall portion between the bypass passage and the oil cooling portion (the oil circulation space where a large number of cooling water pipes are arranged), and Since the passage is provided over substantially the same length as the cooling portion, the degree of cooling is relatively high. Therefore, even when the oil is flowing in the bypass passage, the rate of temperature rise of the oil becomes relatively low, and therefore it is impossible to sufficiently shorten the warm-up operation time.

In particular, in the structure of the above publication, it is proposed to integrally form the wall surface of the cooling unit and the wall surface of the bypass passage in order to simplify the entire structure. However, in such an integrated structure, the cooling unit and the bypass passage are formed. Since the heat transfer coefficient between and becomes high, the above-mentioned problem becomes more remarkable.

An object of the present invention is to solve the above problems in an oil cooler in which the bypass passage portion and the cooling portion are integrally formed.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a slender tubular body wall portion having an oil circulation space formed therein, and a plurality of passages integrally formed with the body wall portion. An outer peripheral wall part that forms a plurality of cooling water pipes that are disposed inside the body wall part and extend in the longitudinal direction thereof, and a pair of end walls that are provided at both ends of the body wall part and that close the oil circulation space. An oil inlet opening and an oil outlet opening are formed at one end and the other end of the body wall portion, respectively, a thermostat is arranged in the vicinity of the inlet opening, and the oil inlet passage of the thermostat is connected to an external oil supply passage. , A main oil outlet passage of the thermostat is connected to the oil circulation space through the inlet opening, and a passage merging portion is provided in the vicinity of the inlet opening, and a bypass passage of the thermostat is generally extended to the merging portion. An outlet passage that extends in the circumferential direction of the wall portion and connects the merging portion and the outlet opening is provided, and the merging portion is connected to the main gallery of the engine via a distribution passage.

[Operation] According to the above configuration, the bypass passage of the thermostat is
It is provided only near the oil inlet opening and extends in the circumferential direction of the body wall. Therefore, the length of the bypass passage is short,
The oil discharged from the thermostat to the bypass passage reaches the joining portion in a short time and is sent from the joining portion to the main gallery of the engine through the distribution passage. Therefore, the degree to which the oil is cooled by the cooling water while passing through the bypass passage is low, which can prevent the temperature of the oil in the bypass passage from decreasing.

[Embodiment] FIG. 1 is a vertical sectional view of an oil cooler according to an embodiment of the present invention, and FIGS. 2 to 4 are sectional views taken along line II-II, III-III and IV-IV of FIG. As is apparent from FIGS. 1 and 2, the illustrated oil cooler has an elongated cylindrical body wall portion 1, a large number of cooling water pipes 2 arranged inside the body wall portion 1, and a body wall portion 1. An outer peripheral wall portion 3 that is integrally continuous with the outer peripheral surface of the body and end walls 4 and 5 (FIG. 1) that close the openings at both ends of the body wall portion 1 are provided.

The body wall portion 1 is arranged in the vicinity of the outside of the cylinder block 6 so as to extend parallel to a crank shaft (not shown), and a passage space 7 is formed therein. A large number of cooling water pipes 2 are arranged at intervals, and the cooling water flowing inside cools the oil in the passage space 7. In order to form a meandering oil passage by the passage space 7, a large number of partition plates 8 are arranged at intervals in the longitudinal direction inside the body wall 1. Each partition plate 8 is perpendicular to the longitudinal direction of the body wall portion 1 and partially closes the passage space 7.

At both ends of the body wall portion 1, there are joint covers 10, 1 for cooling water.
1 is attached. The joint covers 10 and 11 respectively form an outlet cavity 12 and an inlet cavity 13 facing the outer surfaces of the end walls 4 and 5, respectively. Both ends of each cooling water pipe 2 are fitted into the holes of the end walls 4 and 5, and the cooling water passage therein communicates with the outlet cavity 12 and the inlet cavity 13. An external cooling water inlet pipe 15 is connected to the joint cover 11, and an external cooling water outlet pipe 16 is connected to the joint cover 10. Therefore, the cooling water is supplied from the cooling water pipe inlet 15 to the cooling water pipe 2 through the inlet cavity 13 and from the cooling water pipe 2 to the outlet cavity 12.
And is discharged to the external cooling water pipe 16.

The outer peripheral wall portion 3 partially covers the outer peripheral surface of the body wall portion 1 with a gap over a relatively large area, and the gap forms various oil passages and spaces described below. Has been done.

First, as apparent from FIGS. 1 and 2, the exit cavity 1
In the vicinity of 2, the thermostat 2 is provided outside the body wall 1 (on the side opposite to the cylinder block 6 and on the right side in FIG. 2).
0 is provided. The thermostat 20 is attached to the outer surface of the lower half of the outer peripheral wall 3 and is covered with a cover. The inlet passage 21 of the thermostat 20 has a cylinder block 6
Extends from the vicinity of the lower part of the body wall portion 1 in the circumferential direction thereof to reach the thermostat 20. Also, the entrance passage 21
The inlet portion of is formed by the joint pipe portion 22 protruding from the outer peripheral wall portion 3. An outlet passage of an oil filter (not shown) is connected to the joint pipe portion 22.

The main outlet passage 25 of the thermostat 20 extends from the thermostat 20 to an inlet opening 27 above it at a position adjacent to the end wall 4. The inlet opening 27 is an outer portion of the upper half of the body wall portion 1 (a portion opposite to the cylinder block 6).
It is provided in. If the thermostat 20 does not work,
That is, when cooling the oil, the oil supplied from the joint pipe portion 22 to the thermostat 20 via the inlet passage 21 is discharged to the main outlet passage 25 of the thermostat 20, and the inlet opening 27 is opened from the main outlet passage 25 of the thermostat 20. It flows through to the passage space 7 and is cooled as described above.

As is clear from FIGS. 1 and 4, an outlet opening 30 is provided at the end of the body wall 1 on the side of the end wall 5. The outlet opening 30 is provided outside the upper half of the body wall 1 (on the side opposite to the cylinder block 6 and on the left side in FIG. 4), and an outlet passage 31 communicating therewith is provided outside the upper half of the body wall 1. It is provided. A pressure regulating valve 32 is attached to the outer surface of the outer peripheral wall portion 3 in the vicinity of the outlet opening 30. As shown in FIG. 4, the outer peripheral wall 3 is provided with a pressure regulating valve inlet 33 connecting the outlet passage 31 and the pressure regulating valve 32, and a drain opening 34 of the pressure regulating valve 32. The drain opening 34 is located below the pressure regulating valve inlet 33 and communicates with the drain oil passage 35. The drain oil passage 35 is formed on the lower side of the body wall 1, and the internal passage of the joint portion 36 formed inside the outer peripheral wall 3 (on the cylinder block 6 side) and the cylinder block 6 are not shown. It communicates with the engine oil pan through an internal passage on the crankcase side.

As shown in FIG. 1, the outlet passage 31 extends from the outlet opening 30 to the end wall 4 side in the longitudinal direction of the body wall portion 1, and the downstream (left side in FIG. 1) end portion of the inlet opening 27. Near and
It is located slightly closer to the end wall 5 than the inlet opening 27. As is apparent from FIG. 3, the downstream end of the outlet passage 31 is connected to the merging passage 40. The merging passage 40 extends substantially in the circumferential direction on the outer peripheral side of the upper half portion of the body wall portion 1 and communicates with the inner distribution passage 41 (cylinder block 6 side, right side in FIG. 3). The distribution passage 41 is located at the position on the cylinder block 6 side with respect to the upper half of the body wall portion 1,
Extending in the longitudinal direction over substantially the entire length of the. Discharge openings 42 (FIG. 2) are provided in the outer peripheral wall portion 3 at a total of three locations near both ends in the longitudinal direction and the intermediate portion, and the distribution passage 41 is connected to the cylinder block 6 through the discharge openings 42.
It communicates with the main gallery 43 (Fig. 2) inside.

As is clear from the above description, the oil cooled in the passage space 7 flows from the outlet opening 30 into the outlet passage 31, passes from the outlet passage 31 through the merging passage 40, the distribution passage 41, and the discharge opening 42, and then into the main gallery 43. Is supplied to.

Further, according to the present invention, the bypass passage 45 (FIG. 1) of the thermostat 20 is formed as follows.

The bypass passage 45 is also formed between the body wall portion 1 and the outer peripheral wall portion 3, and is provided near the inlet opening 27 and at the inlet opening 27.
A position closer to the end wall 5 extends from the thermostat 20 to the merging passage 40 in the circumferential direction of the body wall portion 1. Since the bypass passage 45 extends in the circumferential direction of the body wall portion 1 as described above, the surface area of the body wall portion 1 covered by the bypass passage 45, that is, the oil in the bypass passage 45 and the cooling water pipe 2 are cooled. The effective heat transfer area with water is very small. Therefore, the bypass passage 45
The degree of cooling of the oil flowing through the cooling water by the cooling water in the cooling water pipe 2 is low.
The oil discharged to 5 flows into the merging passage 40 without being cooled, and flows from the merging passage 40 into the main gallery 43 through the distribution passage 41 and the discharge opening 42.

In the illustrated embodiment, as shown in FIG.
A sensor mounting seat 47 is formed on the upper surface of the upper wall portion (a part of the outer peripheral wall portion 3), and a flow meter and a pressure gauge are mounted on the mounting seat 47.

[Effects of the Invention] As described above, according to the present invention, the thermostat 2
Since the overlapping area between the 0 bypass passage 45 and the oil cooling portion (inside the body wall portion 1) is substantially minimized, the oil in the bypass passage 45 is prevented from being unnecessarily cooled and the warm-up operation time is reduced. It can be shortened.

Of course, since the pipe wall portion of the bypass passage 45 and the cooling portion main body (the body wall portion 1 and the like) can be integrally formed, the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIGS. 2 to 4 are respectively II-II sectional view, III-III sectional view and IV-IV of FIG.
FIG. 1 ... Body wall part, 2 ... Cooling water pipe, 3 ... Outer peripheral wall part, 4, 5 ...
End wall, 7 ... Passage space, 20 ... Thermostat, 21 ... Entrance passage, 25 ... Main exit passage, 27 ... Entrance opening, 30 ... Exit opening, 31 ... Exit passage, 40 ... Confluence passage, 43 ... Main gallery, 45 ... Bypass passage

Claims (1)

[Scope of utility model registration request] 1. An elongated tubular body wall portion having an oil circulation space formed therein, an outer peripheral wall portion integrally forming with the body wall portion and forming a plurality of passages around the body wall portion, and arranged inside the body wall portion. A plurality of cooling water pipes extending in the longitudinal direction thereof, and a pair of end walls provided at both ends of the body wall portion to close the oil circulation space, and one end portion and the other end portion of the body wall portion, respectively. An oil inlet opening and an oil outlet opening are formed, a thermostat is arranged in the vicinity of the inlet opening, an oil inlet passage of the thermostat is connected to an external oil supply passage, and a main oil outlet passage of the thermostat is connected through the inlet opening. It is connected to the oil circulation space, a passage confluence portion is provided in the vicinity of the inlet opening, and a bypass passage of the thermostat is extended to the confluence portion approximately in the circumferential direction of the body wall portion to connect the confluence portion and the outlet opening. The ingredients outlet passage provided, oil cooler for an internal combustion engine, characterized in that connected to the main gallery of the engine through the distribution passage to the merging portion.