JPH018862Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an oil cooler used for cooling oil in a lubrication system of an internal combustion engine.

(Prior art) As shown in Japanese Utility Model Publication No. 57-47583, a core made up of a multilayer stack of plate-like elements each consisting of a pair of plates is disposed inside a casing, and two fluids are connected inside and outside the plate-like element. An oil cooler for an internal combustion engine is known that performs heat exchange between both fluids by separately circulating the fluid.

This oil cooler is provided with a bypass valve that directly communicates or blocks the oil inflow path and the oil outflow path.

Cooling water flows into the outside of the plate element within the casing, and engine oil flows into the plate element. During this time, the two exchange heat. When the oil has low temperature and high viscosity, the bypass valve opens and the oil that has entered the oil inlet passage immediately flows out to the oil outlet passage.

In addition, in the cross-flow heat exchanger disclosed in Japanese Patent Publication No. 57-31077, a dividing plate with an opening is provided in a part of the high-temperature fluid passage, and a part of the high-temperature fluid is removed during heat exchange. Configured to allow bypass.

(Problem to be solved by the invention) In the oil cooler of the conventional structure (former) as described above, when the amount of oil supplied to the oil cooler decreases, the oil cooler supplies the minimum amount of oil required to the lubrication system of the internal combustion engine. A problem may arise in that the supply is not provided. That is, if the conduit for supplying oil from the oil pan to the oil cooler is partially blocked for some reason, or if the conduit is provided with an oil filter,
If the filter becomes clogged, the flow of oil to the oil cooler will decrease. This reduced flow rate of oil is further reduced by the flow resistance of the plate element of the core, resulting in heat exchange and a reduction in the amount of oil supplied to the lubrication system of the internal combustion engine, resulting in engine malfunction. Fear arises. Incidentally, even if a bypass valve is used, the valve normally opens when the oil pressure is equal to or higher than a constant pressure, so it does not work when the flow rate decreases in this way.

In addition, in the latter type of conventional heat exchanger, since the heat exchanger bypasses the heat exchanger halfway through the heat exchange, there is a problem that the heat exchanger passes through the heat exchanger part halfway, causing a pressure loss. This reduces the amount of oil supplied, making it difficult to apply to oil coolers.

(Means for solving the problem) A cooler core in which a large number of flat tubes are laminated with partition walls interposed in between is disposed in a casing, an inlet manifold and an outlet manifold are formed in the cooler core, and an annular tube is formed on the upper wall of the casing. A shroud is provided to form an outflow chamber, the outflow chamber and the outflow manifold are communicated, and a mounting bolt is provided that passes through the cooler core, and a gap is provided on the outer surface of the surrounding wall to form a bypass path, connecting the lower part of the bottom plate and the upper part of the outflow chamber. It has a configuration that allows communication between the two.

(Function) When the amount of oil flowing into the oil cooler decreases due to clogging of the filter or partial blockage of the conduit, the oil flowing into the oil cooler from the bottom surface of the bottom plate flows through the flat tube from the inlet manifold. reaching the outlet manifold,
From there it flows into the outflow chamber. At the same time, some of the oil on the lower surface of the bottom plate does not flow through the flat tube, but immediately flows through a bypass path provided on the outside of the mounting bolt peripheral wall and reaches the upper part of the outflow chamber. and is supplied to the internal combustion engine's lubrication system. As a result of some of the oil flowing through the bypass passage, even if the amount supplied to the oil cooler is reduced as described above, the amount supplied to the lubrication system will not be drastically reduced. Even when the amount of oil supplied to the oil cooler is large, the oil flows through the bypass passage and flows out, but in this case, the amount of oil flowing through the flat tube is relatively small, so the heat Does not significantly deteriorate exchange performance.

(Example) In FIGS. 1 and 2, the oil cooler device 10 includes an oil cooler body 11, an oil cooler 33 consisting of a hollow mounting bolt 12, and a cap 1.
It consists of 3. Oil cooler body 11 of the present invention
As shown in FIGS. 3 and 4, the upper plate 4 has a central opening 1 with inflow ports 2 and 3 around it, and also has a central opening 1a with inflow ports around it. A cooler core 9 in which a number of flat tubes 6 formed by a lower plate 5 having holes 2a and 3a are stacked on a bottom plate 7 is attached to an inverted arm-shaped casing 14.
The bottom plate 7 and the casing 14 are fixed to each other. The flat tube 6 has an oil guide plate 15 in the center thereof, and the center of the plate 15 is open. A partition wall 16 is provided between each flat tube 6. The partition wall 16 communicates the inlets 2, 2a of the upper and lower plates 4, 5 of each flat tube 6, and also communicates the outlets 3, 3a, and connects the inlet manifold 17 and the outlet manifold 18, respectively.
to form. The bottom plate 7 of the cooler core 9 is provided with a central outflow opening 29 and an inflow opening 7a communicating with the inflow manifold 17. The flat tube 6 at the upper end of the cooler core 9 contacts the inner upper wall of the casing 14 via the partition wall 16. Casing 14
has inflow and outflow pipes 19 and 20 on the side walls, and an annular shroud 21 on the top wall to form an outflow chamber 22 inside. Outflow chamber 22 communicates with outflow manifold 18 via an outflow opening 23 provided in the upper wall of casing 14 . A plurality of through holes 25 are formed in the annular shroud 21 .

The oil cooler main body 11 has a bracket 28 in which inflow and outflow passages 26 and 27 are formed.
mounted on. For installation, insert the hollow mounting bolt 12 into the through hole 30 formed in the center of the oil cooler main body 11, fit its lower end to the upper end of the outlet passage 27 of the bracket 28, and insert the hollow mounting bolt 12 into the upper end of the mounting bolt 12. The shroud 21 is held down by the provided flange 12a, and the upper end of the mounting bolt 12 and the cap 13 are connected. A communication port 31 is provided at the upper end of the mounting bolt 12 to allow a discharge chamber 32 formed by the cap 13 and the annular shroud 21 to communicate with the hollow portion of the mounting bolt 12. A slit 24a is provided between the collar 12a and the shroud 21, and a mounting bolt 1
A gap 24b is provided between the second side wall and the through hole 30, forming a bypass path 24.

An oil filter 34 is attached to the inflow path 26 of the bracket 28.

Oil from the oil pan of the internal combustion engine flows into the inlet end of the inlet passage 26 of the bracket 28, flows through the oil filter 34, and enters the oil cooler body 1.
The oil flows into the oil cooler main body 11 from the inflow opening 7a of the bottom plate 7 of No. 1. The oil entering from the inlet opening 7a reaches the inlet manifold 17, flows through each flat tube 6 as shown by the arrow in FIG. Then enter the outflow chamber 22. From there, the oil flows out of the hollow part of the mounting bolt 12 via the discharge chamber 32 and through the communication port 31. At the same time, a part of the oil does not flow through the flat tube 6, but immediately flows through the bypass passage 24 and reaches the discharge chamber 32, and as described above, the oil is removed from the mounting bolt 12.
It flows out into the hollow part of.

On the other hand, the cooling water flows into the casing 14 from the inflow pipe 19 of the casing 14, and flows into each flat tube 6.
It flows through the gap and reaches the outflow pipe 20.

During this time, the oil and cooling water exchange heat with each other.

If the amount of oil flowing from the inlet passage 26 of the bracket 28 is reduced, for example, if the oil filter is clogged,
Alternatively, the conduit may be partially blocked and the oil may be reduced, but even in that case, a portion of the oil is supplied through the bypass passage 24 and is not further reduced.

(Effects) As described above, the oil cooler of the present invention has a structure in which a part of the inflowing oil flows out to the oil discharge chamber without circulating through the flat tube, so that the oil cooler is not supplied to the oil cooler. Even if the amount of oil decreases, the amount of oil flowing through an oil cooler and supplied to a lubrication system is not further drastically reduced, thereby reducing the possibility of engine malfunction.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the oil cooler of this invention and how it is installed, Figure 2 is a diagram showing the oil cooler and the cap, Figure 3 is a partially omitted sectional view showing the inside of the flat tube, and Figure 4 is the flat tube. FIG. 3 is a cross-sectional view of the tube (FIG. 3 A-A). 6... Flat tube, 9... Cooler core, 11
...Oil cooler body, 12...Mounting bolt,
17... Inlet manifold, 18... Outlet manifold, 22... Outflow chamber, 24... Bypass path.

Claims (1)

[Scope of utility model registration request] A flat tube is formed of upper and lower plates having a central opening and an inlet and an inlet around the upper and lower plates, and has an oil guide plate around the central opening, and a partition wall is placed on a bottom plate that has a central outlet and an inlet. an inlet manifold formed by disposing a number of stacked cooler cores in an inverted arm-shaped casing, and connecting inlets of each flat tube in the cooler core;
An annular shroud plate is provided on the upper wall of the casing to form an outflow chamber between the two, a communication port is provided in the annular shroud plate, and an inlet manifold and a bottom plate are provided. The oil cooler body is formed by fixing the bottom plate and the casing, and a hollow mounting bolt is inserted into the central opening of the oil cooler body, and a gap is provided on the outer surface of the circumferential wall of the mounting bolt to form a bypass passage. An oil cooler in which the lower part of the bottom plate communicates with the outflow chamber.