JP2607571Y2 - Cylinder block structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder block structure of an engine.

[0002]

2. Description of the Related Art Conventionally, (1) a cooling path of a cylinder block of a small engine is:
As shown in FIG. 6, a water pump ( not shown )
Cooling water from the hole 12 to the water jacket 1 around the liner 13
Leads to 4, a part of the cooling water holes 15 in the water jacket 14
From the flow to block 11 outside of the cylinder head (not shown), other cooling water in the water jacket 14 flows from the hole 18 through the OY <br/> Rukura 17 from the hole 16 to the cylinder head
It is a route . (2) The cooling path of the cylinder block of a large engine
As shown in FIG. 7, a water pump ( not shown )
Reaches the cooling water hole 22 to the oil cooler 27 I through the tunnel 23, it has a path that flows from the holes 28 from the hole 24 through the liner 25 around the water jacket 26 in the cylinder head outside the block 21.

[0003]

[Problem to be solved by the invention]Route
Does not require the tunnel 23 as shown in FIG.
Has the advantage of being simple and low in cost, but the oil cooler 17
Cooling water flowing throughWater volume is about 20-30% of total water volumeTonaTo
Therefore, with high power enginesAmount of waterShortage,Oil cool
The oil cooling efficiency of LA 17 deteriorates and the oilWarmEvery timeIs above
There is a problem. Also,FIG.ofRouteIs shown in FIG.
As shown, the oil passage 29 of the oil cooler 27
ToInhibitionAnd in area AcoolingwaterToFlowDifficulty toKYouBecausethis
AlsoOil cooler 27oilThere is a problem with poor cooling efficiency
You.

[0004] As further first problem cylinder block basically has, as shown in FIG. 9, there is a cooling of the vicinity of the bottom dead center. In other words, the heat transfer from the piston 30 to the liner 31 is mainly performed through the piston ring, but the heat transfer amount is particularly large near the bottom dead center and near the top dead center. Why in the vicinity of the bottom dead center liner temperature is low <br/> good to than near the top dead center. For more details,
The amount Q of heat transferred to 1 is represented by “Q = α (t0−t1) S”. α is the heat transfer efficiency, t0 is the piston ring temperature, t1 is the liner temperature, and S is the heat dissipation area of the piston ring. Here, t1 is lower at the bottom dead center than at the top dead center. The alpha, the piston velocity tends low because the oil film becomes thin transferred heat in the vicinity of the upper and lower dead center, increases (therefore, alpha in the vicinity of upper and lower dead center are substantially the same). S near the top and bottom dead center has the same value. Nevertheless, FIG.
(B) is a side view of a conventional block 11, is a rear view, as shown in this, conventional water jacket distinction vertical
There is no structure to actively cool near the bottom dead center. The above is the problem of the cooling property near the bottom dead center . FIG.
The width of the water jacket 0 is the width T in the front-rear direction of the engine.
(See FIG. 10 (a)) is made narrower than the width T 'in the left-right direction, in order to make the bore pitch l as small as possible and to make the engine compact, whereby the front-rear direction of the liner is Especially hard to cool.

[0005] The second of the problems inherent in the cylinder block is that the deformation of the liner increases the oil consumption. That is, as shown in FIG. 11, when the head 33 is fastened to the block 32 with the bolts 34 , the inner diameter of the liner 32a changes in the left-right direction as shown in FIG.
And the inner diameter in the front-rear direction changes as shown in FIG.
This is because the deformation Te.

In view of the foregoing, the present invention has been made to solve the drawbacks of the prior art by providing a cylinder block structure capable of actively cooling near the bottom dead center without lowering the cooling efficiency of the oil cooler. And

[0007]

In order to achieve the above object, a first cylinder block structure according to the present invention is a cylinder block structure of a water-cooled engine with an oil cooler. And a lower jacket, and cooling water is supplied to the lower jacket, then the oil cooler chamber , and then the upper jacket. Second, the first cylinder block
In phrase structure, the oil cooler is attached to the oil cooler chamber of the cylinder block, and with a <br/> have long structure in the engine longitudinal direction, the oil flows in the longitudinal direction, and with respect to <br/> longitudinal Te is a structure in which cooling water flows in the direction perpendicular to flow the cooling water from the lower portion the jacket to the oil cooler chamber
A plurality of communication holes may be provided in the longitudinal direction of the engine in the longitudinal direction.
No. Thirdly, in the second cylinder block structure,
The cooling water from the oil cooler chamber to the upper jacket.
A plurality of second communication holes are provided in the longitudinal direction of the engine
You may get . Fourth, the third cylinder block
In the above-described structure, the communication hole and the second communication hole are formed in respective series.
It may be provided for each position corresponding to the solder .

[0008]

According to the operation and effect] The first configuration, since the partition forming the water jacket provided in the cylinder around the upper jacket and a lower jacket I by the partition wall, the reinforcement of the cylinder wall can FIG Rukoto, cylinder wall Is less likely to deform.
Further, the cooling water flows to optimize the oil cooling capacity of the oil cooler and the cooling capacity of the lower part of the cylinder. That is, the cooling water in the cylinder bottom to be cooled the whole amount is best
From the lower jacket, through the oil cooler chamber , to the upper part of the cylinder
Reach the top jacket . Therefore, it is possible to obtain an engine capable of increasing the output and consuming less oil.
Note that the heat transfer amount Q related to piston cooling is expressed by the following equation: “Q = α (t
o-t1) S you express by "but, S here is Ru piston rings radiation area der. And according to this first configuration, as described above, since the cylinder wall is hardly deformed, the piston
Reduction of the ring heat dissipation area S is suppressed. That is, a reduction in the heat transfer amount Q due to the deformation of the cylinder wall is prevented, and therefore, a synergistic effect of improving the cooling efficiency of the piston occurs. Second
The configuration is as follows . Since it was a much trouble cylinder bottom in the first configuration to efficiently cool, the oil cooler o
I want to further increase the cooling capacity of the il . So, oil cooler
And annexed to the oil cooler chamber of the cylinder block, and <br/> with a not long structure in the longitudinal direction engine, a longitudinally oil flows, and cooling water flows in a direction perpendicular to the longitudinal direction structure did. In addition, the cylinder block
Communication with the cooling water flows from the lower portion the jacket to the oil cooler chamber
A plurality of holes were provided in the longitudinal direction in the front-rear direction of the engine. Follow
To the oil cooler at right angles to its longitudinal direction.
Cooling water is easy to flow from bottom to top. In other words, in the longitudinal direction
The structure of the oil cooler is such that cooling water flows at right angles to the
The oil cooling effect of the oil cooler
The rate can be better secured. The third configuration is similar to the second configuration.
In addition, in the cylinder block,
2nd communication hole to let cooling water flow to upper jacket
The oil cooler is equipped with multiple in the longitudinal direction in the front-rear direction.
Cooling from bottom to top perpendicular to its longitudinal direction
Water can be flowed reliably. In other words, in the longitudinal direction
Oil cooler structure with cooling water flowing at right angles to
It can be used completely effectively, so oil cooling of the oil cooler
Better efficiency can be ensured. Therefore, it is possible to obtain an engine capable of further increasing the output and consuming less oil. The fourth configuration is as follows. The communication hole and the third configuration
And the second communication hole at each position corresponding to each cylinder.
As a result, each cylinder can be cooled efficiently. Toes
Even if the amount of cooling water is slightly reduced,
Engine balance and therefore engine and radiator
Small increase in engine output relative to motor weight
I can .

[0009]

1 is a sectional view of an embodiment, in which (a) is a side view, (b) is a rear view, FIG. 2 is an external perspective view of FIG. 1, and FIG.
(A) is a sectional view taken along A-A of FIG. 1, (b) is B-B sectional view of FIG 1, FIG 4 is a plan view of the oil cooler around showing the Re water flow according to the present embodiment, FIG. 5 this embodiment FIGS. 7A and 7B are comparison diagrams of a deformation of a liner portion of a conventional cylinder block, and FIG. 7A is a horizontal direction and FIG.

[0010] As shown in FIG. 1, the cylinder block 1
The cylinder bores 1c which a piston is inserted from the top surface
A plurality of cylinders are provided , and the periphery of the cylinder bore 1c is a liner portion 1a. In the liner portion 1a , a partition wall 1 is provided.
Ru tare provided an upper jacket 2 and the lower jacket 3 was blocked with one another in terms of b. The lower jacket 3 is located at the bottom dead center of the piston, and the upper jacket 2 is located at the top dead center. Further, the block 1, the lower jacket 3 through the cooling water from the water pump (not shown) shown in FIG. 2
The entrance 4 is provided for the block 1 and the exit 6 is
To reach the set digit oil cooler chamber 7 a on the sides, Ru Oh provided only block 1 the number of cylinder bores 1c. In addition, parts
The lock 1, the upper cooling water having passed through the oil cooler chamber 7 a
To put the jacket 2, it is provided with an inlet 5 for the number of cylinder bores 1c, Oh Ru by providing a plurality of outlets 9 leading to the cylinder head (not shown) in the block upper portion. still,
Reference numeral 10 in FIG. 2 denotes an oil entrance / exit passage to the oil cooler 7 .

Next, the operation will be described. The cooling water from the water pump first flows into the lower jacket 3 from the inlet 4 and flows as indicated by the arrow in FIG. 3 (a) to positively move the liner portion 1a near the bottom dead center (a portion with a large amount of heat transfer). The oil enters the oil cooler chamber 7a from the outlet 6 while cooling the oil, and cools the oil flowing in the oil cooler 7. in this case,
In the oil cooler 7, FIG. 2, as shown in FIG. 4, the cooling water
Oil out passage 10 is water but in order to flow from bottom to top
It does not significantly affect for the flow. In other words , the oil cooler
Poor region B of the oil cooling efficiency at 7 Ru Ttei extent as a almost negligible. Moreover, the oil cooler chamber 7 a, because flows all the quantity of cooling water from the water pump
Oil cooling efficiency of the oil cooler 7 is up. Cooling water leaving the oil cooler chamber 7 a enters from the inlet 5 to the upper jacket 2, flows into the head I through the outlet 9 while cooling the vicinity of the top dead center of the liner section 1a. The partition 1
By providing the b improves the rigidity of the liner portion 1a of the blocks 1, thereby deformation of the liner portion 1b is,
FIG embodiment 5 as shown by comparison of (dotted line) and the conventional (solid line), it is ing the engine low oil consumption because it reduces the amount of deformation of the embodiment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment, (a) is a side view,
(B) is a rear view.

FIG. 2 is an external perspective view of FIG.

FIG. 3 is a partial cross-sectional view of FIG. 1, wherein FIG.
A sectional view, (b) is BB sectional drawing of FIG.

4 is a plan view of the oil cooler around showing the Re water flow according to an embodiment.

FIGS. 5A and 5B are deformation comparison diagrams of a liner portion of the present embodiment and a conventional cylinder block, wherein FIG. 5A is a horizontal direction and FIG.

FIG. 6 is a perspective view showing cooling of a cylinder block of a conventional small engine.

FIG. 7 is a perspective view showing cooling of a cylinder block of a conventional large engine.

8 is a perspective view showing a problem in cooling of an oil cooler portion in FIG. 7;

FIG. 9 is a schematic view showing a conventional heat transfer state around a piston.

FIG. 10 is a sectional view of a conventional cylinder block;
(A) is a side view, (b) is a rear view.

FIG. 11 is a cross-sectional view showing a deformation of a liner portion due to tightening of a conventional cylinder block with a head.

12A and 12B are deformation diagrams of the inner diameter of the liner portion in FIG. 11, where FIG. 12A is a left-right direction and FIG. 12B is a front-back direction.

[Explanation of symbols]

1: Cylinder block, 1a: liner portion, 1b: partition, 2: upper jacket, 3: lower jacket, 4: inlet of cooling water supply system, 5: inlet of discharge system, 6: outlet of discharge system, 7: oil Cooler, 7a: oil cooler chamber , 8: oil flow direction.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 56-157344 (JP, U) Japanese Utility Model Sho 57-18721 (JP, U) Japanese Utility Model Sho 56-159621 (JP, U) Japanese Utility Model Sho 57- 44928 (JP, U) Japanese Utility Model Showa 59-35622 (JP, U) JP-B 47-861 (JP, B2)

Claims (4)

(57) [Scope of request for utility model registration] In a cylinder block structure of a water-cooled engine with an oil cooler, a water jacket provided around a cylinder is divided into an upper jacket and a lower jacket by a partition, cooling water is introduced into the lower jacket, and then an oil cooler chamber is provided. A cylinder block structure characterized by a structure in which the flow is performed in the order of the upper jacket. 2. The oil cooler is mounted on a cylinder block.
It is attached to the oil cooler chamber, and a length in the engine longitudinal direction
As well as a have the structure, the oil flows in the longitudinal direction, and has a structure in which cooling water flows in the direction perpendicular to the longitudinal <br/> hand direction, communication with the cooling water flows from the lower portion the jacket to the oil cooler chamber
A structure with multiple holes in the longitudinal direction of the engine
A cylinder block structure according to claim 1, wherein the a. 3. Cooling from the oil cooler chamber to the upper jacket
The second communication hole for flowing water is located in the longitudinal direction of the engine
The structure according to claim 2, wherein a plurality of structures are provided.
Cylinder block structure . 4. The communication hole and the second communication hole are provided in respective syringes.
The structure provided for each position corresponding to the
The cylinder block structure according to claim 3, wherein: