JPH0717777Y2 - Oil cooler mounting device for oil-cooled engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an oil cooler mounting device for an oil-cooled engine, and in particular, it has high durability and can easily form a cooling oil passage in a cylinder head. The present invention relates to an oil cooler mounting device for an oil-cooled engine, which facilitates attachment and detachment of an oil cooler.

<Prior Art> Generally, in an oil-cooled engine that uses a part of lubricating oil as cooling oil, an oil cooler that cools the oil heated by cooling the engine is provided in order to prevent deterioration of the oil. To be Particularly in a partially oil-cooled engine that uses both an oil-cooled system and an air-cooled system to cool the engine, the circulating amount of cooling oil is relatively small, so use a small oil cooler to prevent the cooling air generated by the cooling fan. It is configured to supply a portion to the oil cooler.

That is, for example, as shown in FIGS. 11 to 13, both the upstream and downstream cooling oil passages in the cylinder head 2 of the engine 1
3a and 3b are formed, and an oil cooler 5 connected between both cooling oil passages 3a and 3b is arranged in front of a cylinder head cover 4 made of a casting such as an aluminum alloy, and a crankcase 6 is provided.
A part of the cooling air generated by the cooling fan 7 arranged on the front side of the is guided to the oil cooler 5 by the air guide case 8.

As described above, the small oil cooler 5 is arranged on the front side of the cylinder head cover 4 so that a part of the cooling air is partially removed.
When the oil cooler 5 is configured to be guided to the cylinder head 2, the oil cooler 5 is supported by the cylinder head 2 and the wind guide case 8 via the bracket 9 as shown in FIGS. 11 to 13. 2 is connected to the upstream cooling oil passage 3a via a joint 10 and a rubber tube 11 which are planted on the upper wall of the cylinder head 2, and a rubber tube 12 and a joint 13 which is planted on one side wall of the cylinder head 2. Is connected to the cooling oil passage 3b on the downstream side.
In addition, at both ends of each rubber tube 11 and 12, rubber tube stoppers (not shown) are externally fitted and tightened to prevent oil leakage and slipping out of the rubber tubes 11 and 12.

<Problems to be Solved by the Invention> In the above-described conventional example, since the rubber pipes 11 and 12 are exposed to the outside of the cylinder head 2 and the cylinder head cover 4, deterioration of the rubber pipes 11 and 12 or deterioration of other substances. The rubber pipes 11 and 12 are liable to be broken due to the contact between them, which is disadvantageous in improving durability.

Also, since the directions of the holes for implanting the joints 10 and 13 are different, it is necessary to process these holes in two steps,
The time and labor required to process the cylinder head 2 increase.

Furthermore, when installing or removing the oil cooler 5, the oil cooler 5
In addition to loosening and tightening the bolts that fix the cylinder to the cylinder head 2 and the cylinder head cover 4, it is necessary to assemble the joints 10 and 13, the rubber pipes 11 and 12, and the rubber pipe stopper in a relatively narrow space. 5. Installation work of 5 becomes troublesome.

In addition, the number of parts is large, which is disadvantageous in terms of cost reduction.

The present invention has been made in view of the above circumstances,
An object of the present invention is to provide an oil cooler mounting device for an oil-cooled engine, which has high durability, can easily form a cooling oil passage in the cylinder head, and can easily attach and detach the oil cooler. .

<Means for Solving the Problems> In the oil cooler mounting device of the oil cooling engine according to the present invention, the following technical means are provided to achieve the above object.

That is, according to the present invention, as shown in FIGS. 1 to 10, a cylinder head cover 4 is attached to the upper surface of a cylinder head 2 of an engine 1, and an oil cooler 5 for cooling oil is arranged in front of the cylinder head cover 4. , An upstream cooling path for guiding oil to the oil cooler 5 in the cylinder head 2
In an oil cooler mounting device for an oil-cooled engine provided with 3a and a downstream cooling oil passage 3b for guiding the oil from the oil cooler 5 to the downstream side, the openings of both cooling oil passages 3a and 3b are connected to the upper surface of the cylinder head 2. And the upstream and downstream communication passages 14a and 14b are respectively formed in the cylinder head cover 4, and the openings on one end side of these communication passages 14a and 14b are provided on the lower surface of the cylinder head cover 4. , Both cooling oil passages
The openings 3a and 3b are connected so as to face each other, and the openings on the other end side of both communication passages 14a and 14b are provided on the front surface of the cylinder head cover 4, and the inlet 5a and the outlet 5b of the oil cooler 5 are provided.
With the oil cooler 5 supported by either one of the cylinder head 2 and the cylinder head cover 4, the openings on the other end sides of both the communication passages 14a and 14b are connected to the inlet 5a of the oil cooler 5 and It is characterized in that it is configured to be connected to each of the outlets 5b.

<Operation> According to the oil cooler mounting device for the oil-cooled engine of the present invention, the oil heated by cooling the engine is supplied to the upstream communication passage 14a in the cylinder head cover 4 from the opening of the upstream cooling oil passage 3a. To the inlet 5a of the oil cooler 5 through the upstream communication passage 14a. The oil cooled by the oil cooler 5 flows from the outlet 5b of the oil cooler 5 into the opening of the downstream side communication passage 14b in the cylinder head cover 4, passes through the downstream side communication passage 14b, and flows into the downstream cooling oil passage 3b. It flows into the opening and returns to the downstream oil pan.

On the other hand, in order to perform maintenance such as cleaning inside the oil cooler 5, when removing it from the supporting position of the oil cooler 5,
The connection between the oil cooler 5 and the upstream / downstream cooling oil passages 3a and 3b is also disconnected at the same time. Further, when the oil cooler 5 is arranged and supported on the front side of the cylinder head cover 4, the oil cooler 5 and the upstream / downstream cooling oil passages 3a, 3b are simultaneously faced and connected. Therefore, the work for attaching and detaching the oil cooler 5 is easier than the case of connecting using a conventional rubber tube.
And it can be done easily.

In addition, the cylinder head cover 4 itself has both the communication passages 14a and 14b.
It serves as a protective cover to prevent other objects from contacting the communication passages 14a and 14b.

Further, since the cylinder head cover 4 is made of aluminum alloy or the like, the peripheral walls of the two communication passages 14a and 14b are also made of aluminum alloy or the like, and the two communication passages 14a and 14b are made of a rubber tube. The deterioration as in the case hardly occurs.

The oil cooler 5 may be supported by the cylinder head cover 4 and arranged in front of the cylinder head cover 4, or may be supported by the cylinder head 2 and arranged in front of the cylinder head cover 4. .

<Embodiment> An oil cooler mounting device for a partially oil-cooled engine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
It is as follows.

In this embodiment, the present invention is applied to a partially oil-cooled engine 1. As the cooling oil, as shown in FIG. 4, an oil pan 24 provided under the crankcase 6 of the engine 1 is used. The oil pumped from the oil pump 25 together with the lubricating oil by the oil pump 25 flows out to the relief passage 27 in the pressure setting valve 26 for setting the supply pressure of the lubricating oil.

Further, the cooling oil flowing out to the relief passage 27 is, as shown in FIG. 3, a cylinder formed in the wall portion 30 between the cylinder 28 and the push rod insertion hole 29 formed on one side thereof. After passing through the jacket 31, the upstream cooling oil passage 3a formed in the cylinder head 2 and cooling the periphery of the sub chamber 32, the oil cooler 5 is passed through the upstream communication passage 14a formed in the cylinder head cover 4. And is cooled while passing through the oil cooler 5, the downstream communication passage 14b formed in the cylinder head cover 4, the downstream cooling oil passage 3b formed in the cylinder head 2 and the cylinder jacket 31. The oil is returned to the oil pan 24 shown in FIG. 4 via a return oil passage 33 formed between the push rod insertion hole 29.

The outlet of the upstream cooling oil passage 3a and the inlet of the downstream cooling oil passage 3b in the cylinder head 2 are both opened on the upper surface of the cylinder head 2, and the downstream cooling oil passage 3b penetrates the cylinder head 2 vertically. It is composed of.

The cylinder head cover 4 is made of a casting such as an aluminum alloy, and the left and right side wall portions 4a and 4b are located at positions corresponding to the outlet of the upstream cooling oil passage 3a and the inlet of the downstream cooling oil passage 3b. Stand up from the bottom surface and move forward at a predetermined height L
An upstream-side communication passage 14a and a downstream-side communication passage 14b, which are bent in a V shape, are provided so as to communicate with each other. Further, the cylinder head cover 4 is provided with a cock 15 for opening and closing the upstream communication passage 14a.

As shown in FIGS. 1 and 2, the oil cooler 5 is arranged on the front side of the cylinder head cover 4 and has an inlet 5a directly connected to the upstream communication passage 14a by flange coupling.
Outlet 5 directly connected to the downstream communication passage 14b by flange connection
b, and the inlet 5a of the oil cooler 5 is connected to the upstream communication passage 14a.
By fixing the flange 17 for coupling to the cylinder head cover 4 and the flange 17 for coupling the outlet 5b to the upstream communication passage 14b to the front surface of the cylinder head cover 4 with bolts 18.
Supported by.

The periphery of the inlet 5a and the outlet 5b and the cylinder head cover 4
In order to prevent oil from leaking between the front and the front of the O-ring, as shown in FIGS. 1 and 2, for example, an O-ring.
34 is inserted.

According to the oil cooler mounting device for the partially oil-cooled engine, both the upstream and downstream cooling oil passages 3a and 3b and the oil cooler 5 are provided.
Both the upstream and downstream communication passages 14a and 14b for communicating with the oil cooler 5 are formed in the left and right side portions of the cylinder head cover 4 so that the oil cooler 5 is directly connected to the communication passages 14a and 14b. And both upstream and downstream cooling oil passages 3a
It is possible to communicate with 3b with a simple configuration, and the peripheral walls of both communication passages 14a and 14b are less likely to be broken due to deterioration or collision with another object, and durability can be improved.

Further, both the upstream cooling oil passage 3a and the downstream cooling oil passage 3b of the cylinder head 2 may be opened on the upper surface of the cylinder head 2, and the communication passages 14a and 14b of the cooling oil passages 3a and 3b may be formed in one step.
Can be processed by drilling, and since the cooling oil passage on the downstream side is formed by a drill hole penetrating the cylinder head 2 in the vertical direction, the processing of the cylinder head 2 is simple and It's easy.

Further, the oil cooler 5 can be attached / detached simply by loosening or screwing the bolt 18 to attach / detach the oil cooler 5 to / from the cylinder head cover 4, and loosen the rubber tube stopper to attach the rubber tube to the oil cooler 5 or the joint. There is no need to perform troublesome work such as removing from the 10/13, and the oil cooler 5 can be easily attached and detached.

In particular, here, the cock 15 is provided in the upstream side communication passage 14a so that the upstream side communication passage 14a can be shut off as necessary. Therefore, by closing the cock 15 while the engine 1 is operating, It is possible to stop the supply of the cooling oil to the cooler 5 side, remove the oil cooler 5, and perform maintenance such as cleaning the inside of the oil cooler 5.

In addition, the positions of both cooling oil passages 3a and 3b formed in the cylinder head 2 may be restricted by the joints 10 and 13, the rubber pipes 11 and 12, which are interposed between the oil cooler 5 and the cylinder head 2. Instead, the position of the cooling oil passage 3 in the cylinder head 2 can be freely determined.

In the above embodiment, the oil cooler 5 is the flange.
Although it is fixed to the front surface of the cylinder head cover 4 via 17, the flange 17 can be modified so as to be fixed to the front surface of the cylinder head 2 with a bolt 18 as shown in FIGS. 5 and 6. is there. In this case, the front end portions of the two communication passages 14a and 14b of the cylinder head cover 4 are formed so as to be enlarged in the outer diameter direction, and the inlet pipe 5c or the outlet pipe 5d of the oil cooler 5 is fitted in the inside thereof, and the inlet pipe 5c or A sealing member composed of an O-ring between the outlet pipe 5d and each of the communication passages 14a and 15b.
36 is inserted.

The other configurations are the same as those of the above-described one embodiment, so that the operation is the same as that of the above-mentioned one embodiment, and the same effect as that of the above-mentioned one embodiment can be obtained.

7 and 8 are a plan view and a side view of a cylinder head cover and an oil cooler of an oil cooler mounting device for a partially oil-cooled engine according to another embodiment of the present invention. In this embodiment, the oil cooler 5 A female joint 16a of the self-sealing joint 16 is provided on the inlet pipe 5c and the outlet pipe 5d, and a male joint 16b of the self-sealing joint 16 is provided at the outlet of the upstream communication passage 14a and the inlet of the downstream communication passage 14b. . Then, the oil cooler 5 is supported by the cylinder head cover 4 by connecting these self-sealing joints 16, and
In order to prevent the oil cooler 5 from vibrating with respect to the cylinder head cover 4, a central portion of a bracket 19 provided at the rear end of the oil cooler 5 is fixed to the cylinder head cover 4 with a knob bolt 20.

The other structure is similar to that of the above-described embodiment.

In this embodiment, in addition to the operation or effect of the above-described one embodiment, the effect that the oil cooler 5 can be easily attached and detached is obtained.

That is, the oil cooler 5 can be easily detached from the cylinder head cover 4 by loosening the knob bolt 20 to disengage the self-sealing joints 16, and conversely, the self-sealing joints 16 can be joined together. The oil cooler 5 can be easily assembled to the cylinder head cover 4 by screwing the knob bolt 20. Then, instead of closing the cock 15 of the one embodiment, if the upstream self-sealing joint 16 is disengaged, the male joint 16b
The internal self-sealing valve (not shown) is closed to prevent the cooling oil from spouting from the upstream communication passage 14a to the outside. Therefore, while the engine 1 is operating, the oil cooler 5 can be removed and the inside of the oil cooler 5 can be removed. Maintenance such as cleaning can be performed.

In this embodiment, in order to prevent the vibration of the oil cooler 5 with respect to the cylinder head cover 4, the central portion of the bracket 20 provided at the rear end of the oil cooler 5 is provided with a knob bolt.
Although it is fixed to the cylinder head cover 4 by 20, a rod 21 protruding rearward from the center of the oil cooler 5 is formed on the front surface of the cylinder head cover 4 as shown in FIGS. 9 and 10, for example. The anti-vibration support hole 22 and the anti-vibration rubber between the rod 21 and the inner surface of the anti-vibration support hole 22.
It is also possible to deform so as to interpose 23.

<Effect of the Invention> The present invention has the following effects because it is configured and operates as described above.

a) Since both communication passages are formed inside the cylinder head cover, the cylinder head cover itself serves as a protective cover for the communication passages, preventing other objects from contacting the communication passages, and breaking the communication passages due to collision with other objects. Can be prevented. Further, since the peripheral walls of both the communication passages are also made of the same aluminum alloy as the cylinder head cover, there is almost no deterioration as in the case where the communication passages are made of a rubber tube. Thereby, the durability of the communication passage can be improved.

b) When the oil cooler and the upstream / downstream cooling oil passages are connected by rubber pipes as in the conventional case, in addition to the work of removing / attaching the oil cooler itself when attaching / detaching the oil cooler, the rubber pipe It is necessary to remove and install the. On the other hand, in the present invention, when the oil cooler supported by either the cylinder head or the cylinder head cover is removed from its supporting position, the connection between the oil cooler and the upstream / downstream communication passage is also disconnected, and ,
When arranging and supporting the oil cooler on the front side of the cylinder head cover, the oil cooler and both communication passages are connected so as to face each other, so compared to the case of connecting using a conventional rubber tube,
The work for attaching and detaching the oil cooler is simple and easy.

c) Since the openings of the cooling oil passages are formed on the upper surface of the cylinder head, the openings of these cooling oil passages can be drilled from the same direction. That is, the cooling oil passage opening 1
It can be formed by drilling in the process, the number of processes can be reduced, the cylinder head can be easily processed, and the production cost can be reduced.

d) With conventional joints and rubber pipes, the length required to connect the joint and the rubber pipe, the minimum distance between the joint and the oil cooler required to enable piping work, etc. Although there are restrictions, in the present invention, the arrangement position of the cooling oil passage and the mounting position of the oil cooler can be freely determined to some extent, and the degree of freedom in design can be increased.

[Brief description of drawings]

FIG. 1 is a plan view of an oil cooler mounting device for a partially oil-cooled engine according to an embodiment of the present invention, and FIG. 2 is a side view thereof.
FIG. 3 is a rear view of the partially oil-cooled engine, FIG. 4 is a longitudinal sectional rear view of an essential part thereof, FIG. 5 is a plan view of a modification of the above-described embodiment, and FIG. 6 is a side view of the modification. FIG. 7 is a plan view of an oil cooler mounting device for a partially oil-cooled engine according to another embodiment of the present invention, FIG. 8 is a side view thereof, and FIG. 9 is a modification of the other embodiment described above. FIG. 10 is a plan view, FIG. 10 is a vertical side view of the main part, FIG. 11 is a vertical rear view of the main part of a conventional oil cooler mounting device for an oil-cooled engine, and FIG. 12 is a cross-sectional plan view of the cylinder head. Figure 13 is a vertical cross-sectional side view. 1 ... Engine, 2 ... Cylinder head, 33a ... Upstream cooling oil passage, 3b ... Downstream cooling oil passage, 4 ... Cylinder head cover, 5 ... Oil cooler, 14a ... Upstream communication passage, 14b ...... Downstream communication passage.

Claims (1)

[Scope of utility model registration request] 1. A cylinder head cover (4) is attached to an upper surface of a cylinder head (2) of an engine (1), and an oil cooler (5) for cooling oil is arranged on the front side of the cylinder head cover (4). In the head (2), an upstream cooling oil passage (3a) for guiding oil to the oil cooler (5) side and a downstream cooling oil passage (3b) for guiding oil from the oil cooler (5) to the downstream side. In an oil cooler mounting device for an oil-cooled engine provided with and, the respective openings of the cooling oil passages (3a) and (3b) are formed on the upper surface of the cylinder head (2), respectively, and inside the cylinder head cover (4). Both upstream and downstream communication passages (14a) (14b) are formed in each of the above, and openings at one end side of these communication passages (14a) (14b) are provided in the lower surface of the cylinder head cover (4), Both cooling oils (3a) and (3b) are faced to and connected to the respective openings, and the other end side openings of the communication passages (14a) and (14b) are provided in the front surface of the cylinder head cover (4) to A state in which the inlet (5a) and the outlet (5b) of the oil cooler (5) are faced to each other and the oil cooler (5) is supported by either one of the cylinder head (2) and the cylinder head cover (4). The opening on the other end side of each of the communication passages (14a) and (14b) is connected to the inlet (5a) and the outlet (5b) of the oil cooler (5), respectively. Oil cooler mounting device for oil-cooled engine.