JPH0622529U - Engine oil cooling system - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to an engine oil cooling device, which is provided with an oil cooler on the outside of a cylinder block to improve maintenance and improve heat exchange efficiency in case of oil leakage. At the same time, it is an object of the present invention to provide a lightweight engine oil cooling device with a small pressure loss against the oil flow. A filter bracket 49 directly bolted to the outside of an engine cylinder block, and an oil filter 101 fixed to the filter bracket 49.
A plurality of plates that are bolted to the filter bracket 49, have cooling water passage holes at diagonal corners, and have oil passage holes at other diagonal corners. An oil cooler 73 having a quadrangular core portion 19 in which a cooling water passage and an oil passage are formed is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine oil cooling device.

[0002]

[Prior art]

 As shown in FIG. 9, in a conventional engine oil cooling device, an oil cooler 1 formed by laminating a plurality of rectangular stainless steel plates is used, and an oil cooler housing 3 is provided between the oil cooler 1 and a cylinder block 7 of an engine 5. The oil filter 9 is mounted inside and the oil filter 9 is attached to the front side of the oil cooler housing 3. Then, engine oil (hereinafter referred to as “oil”) O in the oil pan 11 is pumped up to the oil filter 9 by the oil pump 13 and filtered there, and then the oil O is supplied from the oil passage 15 provided in the oil cooler housing 3 to the oil cooler. 1 is cooled by cooling water in the cylinder block 7, and the oil O is returned to the engine 5 from another oil passage 17 provided in the oil cooler housing 3 (Nissan Motor Co., Ltd.). See B-19, page 20 of the published “New Vehicle Manual (Y60-4), NISSAN Safari, Y60 Series Vehicle (Supplementary Edition III)”.

[0003]

[Problems to be solved by the device]

 However, conventionally, the oil cooler 1 is large and heavy because it is made of thick stainless steel, and the oil O introduced into the oil cooler 1 is cooled by the cooling water in the cylinder block 7. However, since it is difficult for the cooling water to flow between the plates of the oil cooler 1, heat exchange with the cooling water may not be performed well.

Further, since the cooling device has a structure in which the oil cooler 1 is mounted in the cylinder block 7, a drawback such as troublesome maintenance when oil O leaks is pointed out. There is.

By the way, the applicant of the present invention has proposed a light weight oil cooler for an automatic transmission, which is formed by stacking a plurality of aluminum plates, in place of the oil cooler made of stainless steel. No. 41972).

This automatic transmission oil cooler includes a hollow core stud bolt into which oil from the automatic transmission flows and a quadrangular core portion formed by stacking a plurality of plates. Insert the hollow outflow side stud bolts at a specified interval, fix the core part to the outside of the housing of the automatic transmission with both stud bolts, and insert the plate side into the diagonal corners of the core part. An oil passage is formed, and these plate-side oil passages are respectively connected to the inflow-side stud bolt and the outflow-side stud bolt by an oil tank portion formed to project to the front side of the core portion.

[0007] Thus, like the oil cooler for the automatic transmission, the oil cooler for engine oil is formed of a plate made of aluminum, and is replaced with a structure in which the plate is mounted in the cylinder block. By mounting on the outside, the above-mentioned problems can be solved.

However, in the above-mentioned oil cooler for automatic transmission, the stud bolt is used for fixing the core portion, and since the inside of the stud bolt is used as an oil passage, the pressure loss of the stud bolt to the oil flow (oil passage). The resistance was large, and the pressure loss was too large to use the oil cooler as it was as an oil cooler for engine oil.

The present invention has been devised in view of such circumstances, and by installing an oil cooler for engine oil on the outside of the cylinder block, it is possible to improve maintenance and improve heat exchange efficiency in the event of oil leakage. It is an object of the present invention to provide a cooling device for engine oil that is lightweight and has little pressure loss against the oil flow.

[0010]

In order to achieve such an object, an engine oil cooling device according to the present invention is provided with a filter bracket directly bolted to the outside of a cylinder block of an engine, and fixed to the filter bracket. The oil filter to be used and the filter bracket are bolted to each other and have a plurality of plates with cooling water passage holes at diagonal corners and oil passage holes at other diagonal corners. The oil cooler comprises a cooling water passage and an oil cooler having a rectangular core portion in which an oil passage is formed between the plates. The oil cooler has two water pipes communicating with the cooling water passage. The fixing bolt insertion holes of the fixing bolts for fixing the core part to the filter bracket are arranged at predetermined intervals on the centerline of the core part in the long axis direction. Together formed Te, oil passage hole corresponding to the fixing bolt insertion hole with each oil passage hole. The fixing bolt insertion hole and the mounting bolt attachment hole for the mounting bolt that attaches the core portion to the filter bracket are formed around the oil passage hole.A substantially triangular oil cooler attachment bracket is fixed to the top surface of the core portion. The filter bracket has an oil inflow passage through which the oil flowing out of the oil outflow passage of the cylinder block flows into the oil passage of the oil cooler through the oil passage hole, and the oil cooled by the oil cooler flows into the oil filter. It is characterized in that an oil inflow passage for allowing the oil to flow and an oil outflow passage for returning the oil from the oil filter to the main oil passage of the cylinder block are formed.

[0011]

[Action]

 According to the present invention, after the oil filter is fixed to the oil filter mounting surface of the filter bracket, the oil cooler is mounted on the filter bracket with the fixing bolt and the mounting bolt, and the filter bracket is bolted to the engine cylinder block. The engine oil cooling device according to the present invention is mounted on the cylinder block.

Then, after the cooling water introduced from the water pipe fills the cooling water passage of the core part, it is led out from the other water pipe, and the oil flowing out from the oil outflow passage of the cylinder block is the oil of the filter bracket. After flowing into the oil passage of the oil cooler from the inflow passage and exchanging heat with the cooling water, it is sent to the oil filter through the oil inflow passage. Then, the oil filtered by the oil filter is returned to the main oil passage of the cylinder block via the oil outflow passage.

When the oil flows into the oil passage in the core, high pressure is applied to the core. However, the fixing bolts inserted at a predetermined interval on the center line of the core in the longitudinal direction of the core cause the oil pressure to increase. It prevents the core part from being deformed.

Further, the fixing bolt and the mounting bolt firmly tighten the space between the oil cooler mounting bracket and the filter bracket to secure the oil sealability.

[0015]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a plan view of an oil cooler for engine oil (hereinafter referred to as "oil cooler") used in a cooling device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. 4, and FIG. 4 is a partially enlarged sectional view of FIG. 2, in which 19 is an aluminum upper plate 21 and a lower plate 23 which are alternately laminated to each other. , 23 is a rectangular core portion in which cooling water passages 25 and oil passages 27 are alternately formed. The core portion 19 has an upper end surface at a predetermined interval on the centerline of the core portion 19 in the longitudinal direction. An aluminum upper plate 31 in which a fixing bolt insertion hole 29 is formed is fixed.

As shown in FIG. 5, the upper plate 31 is provided with cooling water communicating with two cooling water passage holes 33 provided at diagonal corners of the upper plate 21 and the lower plate 23, respectively. The passage holes 35 and the oil passage holes 39 communicating with the two oil passage holes 37 provided at the other diagonal corners of the plates 21 and 23 are burred, respectively. The two water pipes 41 and 43 for introducing the cooling water into and out of the cooling water passage 25 are respectively attached.

Further, as shown in FIG. 1, on the upper plate 31, an oil passage hole 45 into which the burred oil passage hole 39 is fitted, and a fixing bolt corresponding to the fixing bolt insertion hole 29. An insertion hole 47 and, as shown in FIG. 6, an attachment bolt insertion hole 53 of an attachment bolt 51 for attaching the core portion 19 to the filter bracket 49 is formed of two oils of substantially triangular shape formed around the oil passage hole 45. A cooler mounting bracket (hereinafter referred to as "mounting bracket") 55 is fixed. In the figure, 57 is a reinforcing flange formed on the edge of each mounting bracket 55.

On the other hand, as shown in FIG. 5, an aluminum lower plate 59 and a reinforcing plate 61 are sequentially arranged under the core portion 19, and each of the plates 59, 61 has a long length of the core portion 19. A fixing bolt insertion hole 63 is provided coaxially with the fixing bolt insertion hole 29 on the axial center line. Further, as shown in FIG. 4, the oil passage 27 formed in the lowermost layer of the core portion 19 is closed by the lower plate 59.

Further, the upper plate 21 and the lower plate 23 forming the core portion 19 are also provided with fixing bolt insertion holes 65 coaxially with the fixing bolt insertion holes 29, and the fixing bolt insertion holes 65 are formed. An aluminum collar 67 is inserted through the fixing bolt insertion holes 29, 47, 63, and a seat member 69 is attached to the lower end of the collar 67.

Then, as shown in FIG. 6, the fixing bolt 71 is inserted into the collar 67, and the mounting bolts 51 are inserted into the respective mounting bolt insertion holes 53, so that the oil cooler 73 of the present embodiment is inserted into the filter bracket. It will be screwed to 49.

By the way, as shown in FIG. 5, four through holes are formed at each of the four corners of the upper plate 21 and the lower plate 23, and two facing through holes are provided in the cooling water passage. The through hole is a hole 33, and the other opposing through hole is the above-described oil passage hole 37.

Then, as shown in FIGS. 3 and 4, cylindrical portions 73, 75, 77 are integrally formed on the outer peripheral edge of the upper plate 21, the fixed bolt insertion hole 65, and the respective edge portions of the oil passage hole 37. A protruding portion 79 is formed integrally with the edge portion of the cooling water passage hole 33 and protrudes upward. Further, at the outer peripheral edge of the lower plate 23 and the respective edge portions of the oil passage hole 37 and the fixed bolt insertion hole 65, projecting portions 81, 83, 85 projecting toward the upper plate 21 side are integrally formed, respectively. The cooling water passage hole 33 is integrally formed with a cylindrical portion 87 protruding downward. The outer sides of the protrusions 81, 83, 85 of the lower plate 23 are brazed to the inner sides of the cylindrical portions 73, 75, 77 of the upper plate 21, so that the inner side of the upper plate 21 and the inner side of the lower plate 23 are connected to each other. A cooling water passage 25 is formed, and an oil passage 27 is formed outside the lower plate 23 and outside the upper plate 21. An inner fin 89 is provided in each oil passage 27.

Further, as shown in FIG. 4, a large diameter portion 91 and a small diameter portion 93 are formed in the tubular portion 73 of the upper plate 21, and the large diameter portion 91 of the upper upper plate 21 is adjacent to the large diameter portion 91. The lower plate 23 is disposed between the upper plates 21 by being brazed to the small diameter portion 93 of the lower upper plate 21 in a fitted state.

In the oil cooler 73 having the above structure, the non-corrosive flux is applied to each component in advance, and then the water pipes 41 and 43 are inserted into the cooling water passage holes 35 of the upper plate 31 to expand the pipes. Then, the collar 67 is inserted into the fixing bolt insertion holes 47, 29, 65, 63 of the plates 31, 21, 23, 59, 61 and sequentially laminated to form the core portion 19. It is manufactured by fixing each part by expanding the collar 67, heating them in a furnace, and brazing each part.

The oil cooler 73 according to the present embodiment is configured in this way. Next, the filter bracket 49 to which the oil cooler 73 is attached will be described. As shown in FIGS. 6 and 7, the filter bracket 49 is bolted to the cylinder block 99 of the engine through the flange 95 and the tubular mounting bracket 97 that are integrally provided. The oil cooler 73 and the oil filter 101 are attached to the outside of the cylinder block 99 via the above.

Inside the filter bracket 49, an oil inflow passage 105 for allowing the oil O flowing out from the oil outflow passage 103 of the cylinder block 99 to flow into the oil passage 27 of the oil cooler 73, and being cooled by the oil cooler 73. An oil inflow passage 107 for allowing the oil O to flow into the oil filter 101 and an oil outflow passage 111 for returning the oil O from the oil filter 101 to the main oil passage 109 of the cylinder block 99 are respectively formed. At 95, one ends of the oil inflow passage 105 and the oil outflow passage 111 are open.

Further, in the figure, reference numerals 113 and 115 denote substantially triangular mounting flanges provided on the left and right of the filter bracket 49 for fixing the oil cooler 73 via the mounting brackets 55, respectively. The other end side of the oil inflow passage 105 is opened at approximately the center, and one end of the oil inflow passage 107 is opened at approximately the center of the other mounting flange 115. Then, a fixing bolt insertion hole 117 and a mounting bolt insertion hole 119 through which the fixing bolt 71 and the mounting bolt 51 are inserted so as to cover the openings of the oil inflow passages 105 and 107, respectively, are attached to the mounting flanges 113 and 1 respectively. It is provided in 15.

Then, as shown in FIG. 7, the other end side of the oil inflow passage 107 and the oil outflow passage 111 are opened in the oil filter mounting surface opposite to the mounting surface of the oil cooler 73, and The oil O cooled by the oil cooler 73 flows into the attached oil filter 101 via the oil inflow passage 107, and the oil O purified by the oil filter 101 flows into the cylinder block 99 via the oil outflow passage 111. It returns to the main oil passage 109.

On the other hand, the oil filter 101, like the conventional oil filter, has a cylindrical filter material 121 inside, and the outside of the filter material 121 communicates with the oil inflow passage 107 and the filter material 121. The inside of this is connected to the oil outflow passage 111 and is attached to the filter bracket 49.

Since the oil cooler 73, the oil filter 101, and the filter bracket 49 for mounting them on the cylinder block 99, which constitute the engine oil cooling device according to the present embodiment, are configured in this way, the oil filter 101 After being fixed to the oil filter mounting surface of the filter bracket 49, an O-ring 123 is arranged around each of the inflow passages 105 and 107 opening in the mounting flanges 113 and 115 as shown in FIG. The oil passage hole 39 provided on the upper plate 31 of the oil cooler 73 is aligned with the openings of the inflow passages 105 and 107, and the oil cooler 73 is attached to the mounting flange 113 of the filter bracket 49 by the fixing bolt 71 and the mounting bolt 51. 115 and attach the filter bracket 49 to the cylinder. When the block 99 is bolted, the cooling device according to the present embodiment is attached to the cylinder block 99.

Then, as shown in FIG. 8, the cooling water W introduced from the water pipe 41 passes through the cooling water passage holes 33 of the upper plate 21 and the lower plate 23 to fill each cooling water passage 25, and then the other Out of the water pipe 43.

On the other hand, as shown in FIG. 7 and FIG. 8, the oil O flowing out from the oil outflow passage 103 of the cylinder block 99 flows into the oil passage 27 of the oil cooler 73 via the oil inflow passage 105 of the filter bracket 49. After flowing in and exchanging heat with the cooling water W, it is sent to the oil filter 101 via the oil inflow passage 107. Then, the oil O filtered by the oil filter 101 is returned to the main oil passage 109 of the cylinder block 99 via the oil outflow passage 111.

Then, when the oil O flows into the oil passage 27 in the core portion 19 of the oil cooler 73, high pressure is applied to the core portion 19, but in the present embodiment, the center line of the core portion 19 in the long axis direction is Since the core portion 19 is fixed to the filter bracket 49 with the fixing bolt 71 and the collar 67 at a predetermined interval, the collar 67 and the fixing bolt 71 prevent the core portion 19 from being deformed by the pressure of the oil O.

Further, the sealing surface of the O-ring 123, that is, the mounting bracket 55 and the mounting flanges 113 and 115 are firmly tightened by the fixing bolt 71 and the mounting bolt 51, so that the sealing property of the oil O is secured. Become.

As described above, according to the present embodiment, the oil cooler 73 made of aluminum, which is lighter than the conventional one, is used, and the cooling water passages alternately provided in the core portion 19 of the oil cooler 73 are provided. Since the cooling water W and the oil O are flowed in the oil 25 and the oil passage 27 to perform heat exchange, the oil cooler 73 is lighter than the conventional cooling device shown in FIG. 9, and the heat exchange of the oil is good. In addition, since the oil cooler 73 is attached to the outer portion of the cylinder block 99, there is an advantage that the maintainability is improved as compared with the conventional case.

Further, the oil cooler 73 in this embodiment does not use the stud bolt as an oil passage unlike the oil cooler for an automatic transmission disclosed in Japanese Utility Model Laid-Open No. 4-41972, so that the oil cooler 73 Compared to a cooler, pressure loss against oil flow is also small.

In the oil cooler 73 of this embodiment, the core portion 19 is fixed to the filter bracket 49 with the fixing bolt 71 and the collar 67 at a predetermined interval on the center line of the core portion 19 in the long axis direction. Therefore, the core portion 19 is prevented from being deformed by the pressure of the inflowing oil O, and the durability of the oil cooler 73 is improved.

Further, as described above, not only the fixing bolt 71 has a function of mounting and deforming the core portion 19, but also the mounting bolt 51 and the mounting bracket 55 and the mounting flanges 113 and 115 are firmly tightened. Since the sealability of the oil O 2 is secured, there is an advantage that the leakage of the oil O 2 can be surely prevented.

Furthermore, in the core portion 19 of the oil cooler 73 of this embodiment, the collar 67 is inserted into the fixing bolt insertion holes 47, 29, 65, 63 of the respective plates 31, 21, 23, 59, 61. After forming the core part 19 by sequentially stacking the parts, the collar 67 is expanded to fix the parts, and these parts are heated in a furnace to braze the parts, so no baking jig is required. Becomes

[0040]

[Effect of device]

 As described above, according to the engine oil cooling device of the present invention, compared to the conventional cooling device, the oil cooler is lighter in weight, the heat exchange of the oil is excellent, and the maintainability is improved. .

Further, according to the present invention, the pressure loss with respect to the oil flow is small, the durability of the core portion of the oil cooler is good, and the leakage of oil can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a plan view of an oil cooler used in an engine oil cooling device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a partially enlarged sectional view of FIG.

FIG. 5 is an exploded perspective view of a core portion of the oil cooler.

FIG. 6 is an exploded perspective view of a cooling device according to an embodiment of the present invention.

FIG. 7 is an explanatory view showing an oil flow of the cooling device according to the embodiment of the present invention.

FIG. 8 is an overall perspective view of a cooling device according to an embodiment of the present invention.

FIG. 9 is a schematic perspective view of an engine including a conventional engine oil cooling device.

[Explanation of symbols]

 19 core part 21 upper plate 23 lower plate 25 cooling water passage 27 oil passage 29, 47, 65 fixing bolt insertion hole 31 upper plate 33, 35 cooling water passage hole 37, 39 oil passage hole 41, 43 water pipe 45 oil passage hole 49 Filter Bracket 51 Mounting Bolt 55 Mounting Bracket 71 Fixing Bolt 73 Oil Cooler 89 Inner Fin 99 Cylinder Block 101 Oil Filter 103,111 Oil Outflow Passage 105,107 Oil Inflow Passage 109 Main Oil Passage 113,115 Mounting Flange

Claims (1)

[Scope of utility model registration request] 1. A filter bracket (4) bolted directly to the outside of an engine cylinder block (99).
9), the oil filter (101) fixed to the filter bracket (49), and the filter bracket (4
9) A plurality of plates (21, 23) bolted to each other, having cooling water passage holes (33) at diagonal corners and having oil passage holes (37) at other diagonal corners. And an oil cooler (73) having a quadrangular core portion (19) in which a cooling water passage (25) and an oil passage (27) are formed between these plates (21, 23), In the oil cooler (73), two water pipes (41, 43) communicating with the cooling water passage (25) are inserted in correspondence with the cooling water passage holes (33), and the length of the core portion (19) is increased. Fixing bolt insertion holes (65) for fixing bolts (71) for fixing the core part (19) to the filter bracket (49) are formed at predetermined intervals on the axial centerline, and
Each oil passage hole (37) and the fixing bolt insertion hole (6
5) corresponding to the oil passage hole (45) and the fixing bolt insertion hole (47), and the mounting bolt insertion hole (53) of the mounting bolt (51) for attaching the core portion (19) to the filter bracket (49) is the oil passage. A substantially triangular oil cooler mounting bracket (5 formed around the hole (45)
5) is fixed to the upper surface of the core portion (19), and the filter bracket (49) includes the cylinder block (9).
The oil flowing out of the oil outflow passage (103) of (9) is passed through the oil passage hole (37) to the oil cooler (7).
3) an oil inflow passage (105) for flowing into the oil passage (27), an oil inflow passage (107) for allowing the oil cooled by the oil cooler (73) to flow into the oil filter (101), and an oil filter (101). ) From the main oil passage (10) of the cylinder block (99).
An oil outflow passageway (111) for returning to 9) is formed.