JPH037068Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an apparatus for inspecting waterway communication between bores of a cylinder block casting.

(Prior art) In the cylinder block of a multi-cylinder engine,
There is a system that improves the cooling performance of each bore by forming an inter-bore waterway that crosses between each bore (for example, JP-A-Sho).
57-65836). When casting such a cylinder block, a channel component made of steel or the like (for example, a pipe-shaped member) is assembled into the jacket core body, and this is cast between the bores, so that the channel component is connected to the bore. A method of forming an interstitial waterway is generally adopted.

In this method, the waterway component is cast with both ends embedded in the jacket core.
If it is cast in a hollow state, it will be easily deformed by the molten metal, so sand is often put into the channel component during the molding stage. This sand is discharged together with the sand from other cores after casting, but due to insufficient sand removal, it remains inside the waterway component, that is, in the waterway between the bores, and when cooling water is passed through it, it gets around to the water pump. There is a risk of damaging the In addition, during casting, some of the molten metal may enter the end of the channel component and stick to the channel component along with the sand, which may cause clogging of the channel between the bores. .

On the other hand, as a way to check whether or not there is communication between the waterways between the bores, a light source is brought to one end of the waterway between the bores and visually checked to see if light leaks to the other end. In some cases, air blowing may be used to remove the sand, but since it is a visual check, it is difficult to ensure an accurate check, and even if sand remains, there is a risk that light may leak and it may be determined that there is communication. There is.

(Purpose of the invention) The present invention solves the above-mentioned problems of the conventional technology, and can simultaneously check the communication of the inter-bore waterway and reliably remove sand remaining in the inter-bore waterway using a relatively simple device. The aim is to make sure that

(Structure of the invention) The present invention is a device for inspecting the communication of the inter-bore water passage in a cylinder block casting in which a pair of vertical holes opened on the upper surface face each end of the inter-bore water passage. A support body placed on the upper surface of the air nozzle and an air receiver cylinder are supported by the support body and inserted into both the vertical holes. This air nozzle is provided with an air outlet that blows air into the inter-bore waterway, and the air receiver has an opening facing the inter-bore waterway, and the air pressure transmitted through this opening allows communication between the inter-bore waterway. Means for detecting the condition and a sand escape hole are provided for discharging sand entering through the opening.

In the case of the above-mentioned bore-to-bore waterway communication inspection device, air is blown into the bore-to-bore waterway from an air nozzle, and it is checked whether the bore-to-bore waterway is in a communicating state by checking whether the air pressure acting on the air receiver is equal to or higher than the set pressure. I will do it. At that time, if sand remains in the waterway between the bores,
The sand is blown away and discharged from the sand relief hole.

(Effects of the invention) Therefore, according to the invention, it is possible to reliably determine by air pressure whether the inter-bore waterway is clogged due to leaking hot water, etc., and if the inter-bore waterway is in a state where communication is possible, the bore can be removed. Sand remaining in the interstitial waterway is reliably removed at the same time as the communication check, and failures in the communication check due to such removable sand remaining are also prevented.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows the overall structure of a communication inspection device 3 for a waterway 2 between bores of a cylinder block casting 1. As shown in FIG.

First, the cylinder block casting 1 is for a water-cooled multi-cylinder engine in which a plurality of cylinder bores 4 are arranged in a row as shown in FIG. Between each of the cylinder bores 4, a pipe-shaped metal waterway forming member 5 shown in FIG. 3 is cast in a direction perpendicular to the direction in which the cylinder bores 4 are arranged. As shown in FIG. 4, both ends of the water channel component 5 protrude into the bore outer water channels 8, 8 between the cylinder wall 6 and the block wall 7, and from one bore outer water channel 8 to the other bore outer water channel 8. It constitutes an inter-bore waterway 2 through which cooling water passes to the outer waterway 8. Then, a cylinder block casting 1 is attached to both ends of each inter-bore waterway 2.
Vertical holes 10, 10 open in the upper surface 9 of the holder face each other. This vertical hole 10 serves as a communication path between the bore outer water channel 8 and the water channel on the cylinder head side.

Now, the communication inspection device 3 for the inter-bore waterway 2 is as follows:
As shown in FIG. 1, there is a support 11 placed on the upper surface 9 of the cylinder block casting 1, and vertical holes 10 at both ends of the inter-bore waterway 2 supported by the support 11.
The air nozzle 12 and the air receiving cylinder 13 are respectively inserted into the air nozzles 10 and 10, respectively. In this example, the support body 11 supports a plurality of air nozzles 12 and air receiving cylinders 13 corresponding to each inter-bore waterway 2. Each air nozzle 12 communicates with an air supply pipe 14 at its upper end, is closed at its lower end, and has an air outlet 15 formed in the lower part of the cylindrical wall facing one opening of the inter-bore waterway 2.

On the other hand, the air receiving cylinder 13 has an opening 16 formed at the lower part of the cylinder wall and facing the other opening of the inter-bore waterway 2, and has a means for detecting communication of the interbore waterway 2 at the upper end of the air receiving cylinder 13. 17 are provided. That is, a float chamber 18 with a larger inner diameter is formed at the upper end of the air receiver cylinder 13, and a float 19 that rises when the internal pressure of the air receiver cylinder 13 exceeds a set value is provided in the float chamber 18. An air pressure sensor 20 that is sensitive to contact with the float 19 and a communication indicator lamp 21 that lights up in response to the operation of the air pressure sensor 20 are provided at the upper end of the float chamber 18. Further, a sand escape hole 22 is formed at the lower end of the air receiving cylinder 13.

FIG. 5 shows a jacket core 23 used for casting the above-mentioned cylinder block casting 1, and the water channel component 5 is in a state in which sand is put inside and both ends are embedded in the core body 24 during molding. and then cast into cylinder block castings.

When inspecting the communication between the bore waterways 2, by placing the support 11 of the communication inspection device 3 on the upper surface 9 of the cylinder block casting 1 after sand removal, each air nozzle 12 and air receiving cylinder 13 are connected to each vertical hole 10. are inserted facing each other, and air is supplied from the air nozzle 12 to the inter-bore waterway 2. If the inter-bore waterway 2 is in a state where it can communicate, the sand remaining in the inter-bore waterway 2 is blown out by the air, and the air receiving tube 1
The pressure of the air discharged from the sand relief hole 22 of No. 3 and passed through the inter-bore waterway 2 in this state acts on the float 19, and as the float 19 rises, the air pressure sensor 20 is activated and the communication indicator lamp 21 lights up. .
That is, as a result, the inter-bore waterway 2 communicates with each other,
It is also confirmed that the residual sand has been removed. On the other hand, if the inter-bore waterway 2 is partially or completely blocked due to leakage during casting, the air pressure does not act sufficiently on the air receiver cylinder 13 side, and therefore the air pressure sensor 20 The communication indicator lamp 21 does not operate, and it is confirmed that the inter-bore waterway 2 is in a state where it is difficult for the cooling water to flow.

In the above embodiment, the air pressure sensor 20 that is activated by contact with the float 19 is used, but other pressure sensors such as a sensor that uses a proximity switch that is activated by the proximity of the float may be used.

In addition, in order to confirm the presence or absence of communication of the inter-bore waterway 2, instead of the indicator lamp 21 of the above embodiment,
For example, other alarm means such as a buzzer that operates if the air pressure sensor does not operate within a predetermined time after air supply may be used.

Further, the inter-bore waterway may be formed by filling sand into a waterway member having a U-shaped cross section and opening at the top, instead of using the pipe-like waterway member of the above embodiment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially sectional perspective view showing the relationship between the cylinder block casting and its bore waterway communication inspection device, FIG. 2 is a plan view of the cylinder block casting, and FIG. FIG. 3 is a perspective view of the inter-bore channel component, FIG. 4 is a horizontal sectional view of the cylinder block casting, and FIG. 5 is a plan view of the jacket core. 1...Cylinder block casting, 2...Bore waterway, 3...Communication inspection device, 4...Cylinder bore,
5... Channel component, 9... Upper surface, 10... Vertical hole, 11... Support, 12... Air nozzle, 13
...Air receiver cylinder, 15...Air outlet, 16...
Opening, 17...detection means, 22...air escape hole.

Claims (1)

[Scope of utility model registration request] A support body placed on the upper surface of a cast cylinder block having vertical holes facing each end of the inter-bore waterway, and an air nozzle and an air receiver supported by this support body and inserted into each of the vertical holes. The air nozzle has an air outlet for blowing air into the inter-bore waterway, and the air receiving cylinder has an opening facing the inter-bore waterway, and an air outlet for blowing air into the inter-bore waterway. 1. An apparatus for inspecting communication between bores of a cast cylinder block, comprising: detection means for detecting the state of communication of the waterways between the bores based on the opening; and a sand escape hole for discharging sand entering from the opening.