JP3905426B2 - Cylinder block spacer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spacer (which may be called an insert or an insert) provided in a water jacket of a cylinder block of an internal combustion engine.
[0002]
[Prior art]
In the cylinder block, a water jacket is formed around the cylinder bore wall, and engine cooling water is circulated therethrough to cool the cylinder bore wall heated by combustion heat or piston sliding. The temperature at the upper part of the cylinder bore wall near the combustion chamber tends to be higher than the temperature at the lower part of the cylinder bore wall. For this reason, if the cooling water is uniformly supplied to the water jacket to prevent the temperature of the upper part of the cylinder bore wall from becoming high, the lower part of the cylinder bore wall is overcooled and the friction loss generated at the sliding portion with the piston increases. This causes a problem.
In order to improve the temperature distribution of the cylinder bore wall, Japanese Utility Model Laid-Open No. 57-43338 proposes to provide a spacer in the water jacket. By providing a spacer in the water jacket, the amount of heat taken away from the cylinder bore wall can be adjusted, and in the portion where the spacer is provided, the water flow is reduced and the temperature of the cylinder bore wall can be maintained. Can be improved.
[0003]
[Problems to be solved by the invention]
If the spacer has a contact part that contacts the wall surface of the water jacket of the cast iron cylinder block (including the wall surface of the cylinder bore wall), rust is likely to occur on the wall surface of the water jacket, and the rust will come off and the radiator will be clogged. There was a problem of causing problems such as.
As a reason of rust occurrence,
(I) Water is injected during inspection before shipment at the engine factory, and leakage inspection is performed. However, it is difficult to drain all the water after inspection, and the part where the spacer and water jacket wall come into contact when the spacer is assembled or intentionally Corrosion (rust) is likely to occur on the water jacket wall of the cylinder block at the portion to be in close contact with.
(Ii) Even if LLC (anti-freezing liquid with rust prevention action) is put in the water jacket at the vehicle assembly plant, it is difficult for the LLC to circulate in the contact portion between the spacer and the water jacket wall, and the rust prevention action of the LLC is fully exhibited. Otherwise, rust is likely to occur at the contact portion of the water jacket wall with the spacer.
and so on.
The objective of this invention is providing the spacer for cylinder blocks which can suppress generation | occurrence | production of the rust in the contact part of a spacer and a water jacket wall.
[0004]
[Means for Solving the Problems]
The present invention for achieving the above object is as follows.
( 1 ) A cylinder block spacer provided on the water jacket of the cylinder block and having a contact portion that contacts the wall surface of the water jacket, and the spacer is disposed on an outer periphery of a portion of the cylinder bore wall that is spaced downward from the periphery of the combustion chamber. A cylinder block spacer provided in the water jacket so as to be in contact , and provided with a plurality of grooves on the contact surface of the contact portion of the spacer for circulating the coolant.
[0005]
In a cylinder block for spacers (1) above, since the LLC in the groove of the contact portion can flow to circulate, rust water jacket wall portion spacer is in contact can be suppressed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The cylinder block spacer of the present invention will be described below with reference to the drawings.
In the figure, 1 to 3 show a cylinder block mounted to the cylinder block spacer of the present invention, FIG. 4 shows an embodiment of the present invention.
The claim 1 corresponds to the embodiment of the present invention.
[0007]
Also not a, a cylinder block mounted to the cylinder block spacer of the present invention, for example with reference to FIGS. 1 to 3 will be described.
[0008]
The cylinder block spacer 1 of the present invention (a spacer may be called an insert, an insert, or the like) is a spacer that is inserted into and arranged in the water jacket 11 of the cylinder block 10. The cylinder block 10 may be a closed deck type or an open deck type. The water jacket 11 is continuous in the longitudinal direction of the cylinder block along the cylinder bore 13. The cylinder block 10 shown in FIGS. 1 to 3 is a closed deck type cylinder block, and a water hole 12 is provided on the upper surface of the cylinder block. The water hole 12 is connected to the water jacket 11 in the cylinder block 10. It is a hole for flowing engine coolant between the water jacket in the cylinder head and is connected to the water jacket 11. The spacer 1 is disposed in the water jacket 11 so as to be in contact with or in close contact with the outer periphery of a portion of the cylinder bore wall 14 that is desired to be prevented from being excessively cooled (portion separated from the periphery of the combustion chamber). The water flow and the amount of water are adjusted so that heat is not excessively removed from the cylinder bore wall 14 of the spacer arrangement portion.
[0009]
The spacer 1 is inserted into the water jacket 11 through the water hole 12 on the upper surface of the cylinder block, for example. When the spacer 1 is inserted and arranged in the water jacket 11 through the water hole 12, the shape of the spacer 1 when the spacer 1 is passed through the water hole 12 is smaller than the water hole 12, but after the spacer 1 is passed through the water hole 12. The shape of the spacer 1 may be larger than the water hole 12. As a method of making the shape of the spacer 1 larger than the water hole 12 after passing the spacer 1 through the water hole 12, the elastic body 3 constituting the spacer 1 is swollen in contact with water or LLC (or by water temperature or liquid temperature). The elastic body 3 is made of a material to be expanded, for example, water-swelling foam rubber (or heat-expandable foam rubber), or the support 2 constituting the spacer 1 is expanded by a spring or a screw rod and fixed to the support 2 May be moved in a direction approaching the wall surface of the cylinder bore wall 14 which is a water jacket wall surface.
[0010]
With respect to the effect of the configuration in which the gap between the spacer 1 and the cylinder bore wall 14 is eliminated or reduced, the amount of water flowing around the cylinder bore wall 14 in the spacer arrangement portion is reduced, and the heat taken from the cylinder bore wall 14 in the spacer arrangement portion is reduced. This prevents the cylinder bore wall 14 in the spacer arrangement portion from being overcooled.
[0011]
However, if the spacer 1 comes into contact with or closely contacts the wall surface of the cylinder bore wall 14 which is the wall surface of the water jacket, the water that has entered between the spacer 1 and the cylinder bore wall surface does not escape in the leak inspection before shipping at the engine factory. Since there is a possibility of causing a problem that rust is generated on the wall surface of the cylinder bore wall 14 of the cast iron cylinder block that comes into contact or in close contact, the following various measures are taken in the present invention. These measures are different in each embodiment of the present invention.
[ 0012 ]
In an embodiment of the present invention, as shown in FIG. 4, the elastic body 3 constituting the spacer 1 is provided in an water jacket 11 of the cylinder block 10, in contact with the water jacket wall (especially the wall surface of the cylinder bore wall 14) Contact portion 3a. The contact surface of the contact part 3a is provided with at least one, for example, a plurality of grooves 6 for circulating the coolant. The groove 6 has a channel cross-sectional area that allows the LLC to flow without staying in the groove 6 when the LLC is filled and circulated.
[ 0013 ]
Regarding the operation of the embodiment of the present invention, since LLC can circulate and flow in the groove 6 of the contact portion 3a, the LLC can be supplied to the wall surface of the water jacket where the spacer 1 contacts and rust is generated. Can be suppressed.
[ 0014 ]
【The invention's effect】
According to the cylinder block spacer of the first aspect , since the LLC can circulate and flow in the groove of the contact portion, it is possible to suppress the occurrence of rust on the water jacket wall surface portion in contact with the spacer.
[Brief description of the drawings]
1 is a plan view of the cylinder block can be a cylinder block spacer applied to real施例is mounted of the present invention.
2 is a front cross-sectional view of the spacer and its vicinity of the cylinder block of FIG. 1. FIG.
FIG. 3 is a side view and a plan view of a spacer and the vicinity thereof in the cylinder block of FIG.
[4] Examples of the present invention, is a front cross-sectional view of a spacer and its vicinity cylinder block.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Spacer 2 Support tool 3 Elastic body 3a Contact part
6 grooves 10 Cylinder block 11 Water jacket 12 Water hole 13 Cylinder bore 14 Cylinder bore wall

Claims (1)

A cylinder block spacer provided on a water jacket of a cylinder block and having a contact portion that contacts a wall surface of the water jacket, wherein the spacer contacts an outer periphery of a portion of the cylinder bore wall that is spaced downward from around the combustion chamber. As described above , a cylinder block spacer provided in the water jacket and provided with a plurality of grooves on the contact surface of the contact portion of the spacer for circulating a coolant.

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