JPH0157298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic pressure testing device for checking the presence or absence of water leakage from a cooling water passage of a cylinder head fixed on a cylinder block in an engine.

In a water-cooled engine, if cooling water enters the cylinder, the engine may be damaged due to water hammer phenomenon. The causes of such cooling water intrusion into the cylinder include flaws in the cylinder liner, water leakage from the cylinder head gasket, and water leakage from the cooling water passage due to cracks in the cylinder head. There are some reasons. Cylinder liner flaws can be easily detected by dye inspection, but it is necessary to determine whether water is leaking from the cylinder head gasket or from the cooling water passage due to cracks in the cylinder head. If this is not possible, a hydraulic pressure test of the cylinder head is performed. If this water pressure test could be performed extremely easily, the working time would be shortened and work efficiency would be improved, but currently such a water pressure testing device has not been realized.

The present invention has been made based on such viewpoints, and has a simple structure that can be manufactured extremely easily, and also allows for easy implementation of water pressure tests, thereby improving work efficiency. The purpose of this invention is to provide a hydraulic testing device for cylinder heads.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, a cylinder head 1 to be subjected to a hydraulic pressure test is fixed to a mounting base 3 on a foot base 2. As shown in FIG. In this state, all of the cooling water passages 4 in the cylinder head 1 are closed except for the cooling water outlet 5, and a pressurized water supply means 6 is connected to the cooling water outlet 5 to supply pressurized water at a predetermined constant pressure. The presence or absence of water leakage can be confirmed by supplying water to the cooling water passage 4 and observing each part of the cylinder head 1 while maintaining the pressurized state for a while.

Referring to FIGS. 2 and 3 together, the cylinder head 1 is divided into sections corresponding to the respective cylinders of, for example, a water-cooled 12-cylinder V-type diesel engine, and a fuel nozzle 7 is located in the center of the cylinder head 1. placed,
A pair of intake valves 8 and 9 are arranged on one side of the fuel nozzle 7, and a pair of exhaust valves 10 and 11 are arranged on the other side. The upper ends of the pair of intake valves 8 and 9, which are biased upward by a spring, are commonly fitted into a vertically movable pressing member 12, and the pressing member 12 is connected to the rocker arm 1.
It is connected to one end of 3. The other end of the rocker arm 13 has a hole 1 that vertically passes through the cylinder head 1.
4 and is connected to a push rod (not shown) which reciprocates up and down in response to a camshaft. Also, a pair of exhaust valves 1 are spring-biased upward.
The upper end of 0, 11 is a pressing member 15 that is vertically movable.
The pressing member 15 is connected to one end of the rocker arm 16. The other end of the rocker arm 16 is adjacent to the hole 14 and is connected to the cylinder head 1.
The push rod is inserted into a hole 17 passing vertically through the shaft and connected to a push rod that reciprocates up and down in response to a camshaft.

On the lower surface of the cylinder head 1, around a pair of intake valves 8, 9 and a pair of exhaust valves 10, 11,
A plurality of holes 18 to 23, for example six, are opened for communicating the cooling water passage 4 of the cylinder head 1 with the cooling water passage of a cylinder block (not shown). The cylinder head 1 also has a plurality of holes 24 to 3, for example 10, through which tightening bolts connecting the cylinder block and the cylinder head 1 are inserted.
3 are drilled through the top and bottom.

In FIGS. 4 and 5, the footrest 2 includes a support frame 37 formed into a substantially U-shape by connecting one ends of a pair of parallel parts 34 and 35 with a connecting part 36, which is reinforced with a reinforcing member 38. It is supported by four legs 39 to 42, and a caster 43 is fixed to the lower end of each leg 39 to 42 to facilitate movement of the leg base 2.

Short cylindrical bearing members 44 and 45 are fixed to both ends of the connecting portion 36 in the footrest 2, respectively, with their axes substantially horizontal and concentric. Both ends of a support shaft 46 are rotatably inserted through these bearing members 44 and 45, respectively. A mounting base 3 having an upper surface 47 parallel to a plane including the axis of the support shaft 46 is fixed to the support shaft 46 via a connecting plate 3a.

The mounting base 3 is formed in a rectangular shape corresponding to the lower surface of the cylinder head 1, and has a fuel nozzle 7, a pair of intake valves 8, 9, and a pair of exhaust valves 10, 11 on the lower surface of the cylinder head 1 in the center thereof. A circular observation hole 48 having a diameter corresponding to a combustion chamber (not shown) facing the combustion chamber is bored. Observation hole 4
The upper surface 47 around the cylinder head 1 is provided with elastic blind covers 49 to 54 which correspond to the holes 17 to 23 in the lower surface of the cylinder head 1 and have a larger diameter than the holes 17 to 23.
is pasted. Further, on the upper surface 47, two tightening bolts 5 are provided corresponding to at least two of the insertion holes 24 to 33 in the cylinder head 1, for example, two insertion holes 24 and 26 near the support shaft 46.
5 and 56 will be erected. Furthermore, the remaining insertion hole 2
A bolt hole 57 is drilled corresponding to at least one of the through holes 5, 27 to 33, for example, the insertion hole 30 located at the apex position of a triangle whose base is a straight line connecting the insertion holes 24 and 26.

At the end of the mounting base 3 opposite to the support shaft 46, there is a rotating arm 5 extending in a direction away from the support shaft 46.
8 is fixed.

The support frame 37 of the base 2 is provided with support means 59 for supporting the mounting base 3 at an angle α which is the same as the angle α that the cylinder head 1 makes with the horizontal plane when connected to the cylinder block. This support means 59 includes the parallel portion 34 in the support frame 37,
A pair of support columns 60, 61 are erected at mutually corresponding positions of 35, and a pair of semi-cylindrical receiving members 62, 63 are fixed to the upper ends of the support columns 60, 61 and open upward. Both receiving members 62, 63
It consists of a support rod 64 that is stretched between the two. The distance 1 of each support column 60, 61 from the support shaft 46 and the height h from the support frame 37 to the upper surface of the support rod 64 are set so that tanα≈h/l.

According to such a support means 59, the receiving member 6
Mounting base 3 is placed on support rod 64 placed on 2,63.
By placing the mounting base 3 on it, it is possible to support the mounting base 3 while making an angle α with the horizontal surface. Moreover, by removing the support rod 64 from the receiving members 62, 63, the supporting state of the mount 3 can be released and the mount 3 can be freely rotated downward.

Referring again to FIG. 1, the pressurized water supply means 6 includes a pressurized tank 65. This pressurized tank 65 is supported by legs 66, and a water test tank 67 is connected to the middle of the tank for checking whether water has been filled to a certain level. An air pressure gauge 68 is provided at the upper end of the pressurized tank 65, and
Pressure air from compressor etc. is transferred to pressure tank 6.
An air supply pipe 69 for introducing water into the pressure tank 65 is connected, and a water injection pipe 7 for injecting water into the pressure tank 65 is connected.
0 is connected. A three-way pot 71 having a side port for communicating the inside of the pressure tank 65 with the atmosphere is provided in the middle of the air supply pipe 69, and a shutoff pot 72 is provided in the middle of the water injection pipe 70. Also pressure tank 6
5 is connected to a water conduit 74 having a cutoff pot 73 in the middle.

One end of a flexible tube, such as a pressure-resistant rubber hose 75, is connected to the end of the water conduit 74, and the other end of the rubber hose 75 has a flange 76 for connecting to the cooling water outlet 5 of the cylinder head 1.
It is connected to a connecting pipe 77 provided with. A pressure impulse pipe 78 is branched and connected in the middle of the connecting pipe 77, and this pressure impulse pipe 78 is connected to a water pressure gauge 79.

Next, to explain the operation of this embodiment, when conducting a water pressure test, first
At the same time, the shut-off pot 72 is opened, and water is poured into the pressurized tank 65 from the water injection pipe 70 to a certain level. Next, a white anticorrosive agent is poured into the pressurized tank 65 from the water injection pipe 70 to make the water in the pressurized tank 65 milky white, and the shutoff pot 72 is closed. Next, while inserting the tightening bolts 55 and 56 into the insertion holes 24 and 26, the cylinder head 1 to be subjected to the hydraulic pressure test is held in a state where it forms an angle α with the horizontal plane by the support means 59 as shown in FIG. Place it on the supported mounting base 3. At this time, after the cylinder head 1 is removed from the cylinder block, it is suspended by a crane and placed on the mounting base 3, but the mounting base 3 is set at the same angle α as the state in which the cylinder head 1 is attached to the cylinder block. Since it is supported, it becomes extremely easy to place the cylinder head 1 on the mounting base 3. Furthermore, since the tightening bolts 55 and 56 are inserted into the insertion holes 24 and 26, respectively, the cylinder head 1 will not slide off from the mounting base 3.

After the cylinder head 1 is placed on the mounting base 3, the nuts 80 are screwed onto the tightening bolts 55 and 56 and tightened, and the bolt holes 57 of the mounting base 3 and the insertion holes 3 of the cylinder head 1 are
A bolt 81 is inserted into the bolt 81, and a nut 82 is screwed onto the bolt 81 and tightened. As a result, the cylinder head 1 is firmly fixed to the mounting base 3. By tightening the cylinder head 1 to the mounting base 3, the holes 18-23 on the underside of the cylinder head 1 are reliably closed by the corresponding blind covers 49-54, respectively. Further, as shown by the two-dot chain line in FIG. 1, the pressing members 12 and 15 are pressed down using appropriate metal fittings 83 to push down each pair of intake valves 8 and 9 and exhaust valves 10 and 11.

When the installation of the cylinder head 1 to the mounting base 3 is completed in this way, the flange 76 of the connecting pipe 77 is connected to the cylinder head 1, the cooling water outlet 5 is connected to the connecting pipe 77, and the pressurized water supply means 6 is connected to the cylinder head 1. A three-way cock 71 in the middle of the trachea 69 is opened, and compressed air is supplied into the pressurized tank 65 from a compressor (not shown) or the like. Next, the shut-off stock 73 is opened, pressurized water is supplied to the cooling water passage 4 of the cylinder head 1, and when the water pressure reaches, for example, 4 kg/cm ² g, the shut-off stock 73 is closed.

The water pressure is maintained at 4 kg/cm ² g for at least 5 minutes, and during this time the top and side surfaces of the cylinder head 1 are observed to see if there is any water leakage. This state is the same as the state in which the cylinder head 1 is attached to the cylinder block, and the presence or absence of water leakage can be confirmed in a state close to the actual state. In addition, the pressurized water has a milky white color due to the addition of anticorrosion agents, so if there is a water leak, the location of the leak can be easily found.

After the inspection for water leakage on the top and side surfaces of the cylinder head 1 is completed, the rotating arm 58 is grasped, the mounting base 3 is slightly lifted upward, and the support rod 64 of the support means 59 is pulled out to the side. As a result, it becomes possible to rotate the mounting base 3 downward, and by grasping the rotating arm 58 and gradually rotating the mounting base 3 downward, the mounting base 3 is rotated as shown by the two-dot chain line in FIG. bring it to an almost upright position. In this way, the state of water leakage on the lower surface of the cylinder head 1 can be easily visually inspected from the side through the observation hole 48.

As another embodiment of the present invention, a pressure sensor may be installed in the middle of the connecting pipe 77 to convert the water pressure into an electrical signal, extract it, and amplify it, and check for water leakage based on changes in the electrical signal. It is possible.

As described above, according to the present invention, the mounting base is rotatably supported on the leg base, and the mounting base is supported by the supporting means at an angle corresponding to the mounting angle of the cylinder head to the cylinder block. Therefore, it becomes easy to place the cylinder head on the mounting table, and the test can be conducted under conditions close to actual conditions. Further, the supporting means can be released from the supporting state, and since the mounting base is provided with an observation hole, the state of water leakage on the lower surface of the cylinder head can be easily visually inspected.
Furthermore, since at least two tightening bolts that can be inserted into the insertion holes of the cylinder head are erected on the mounting base, the cylinder head does not slip off the mounting base, and the tightening work is facilitated. Furthermore, by simply tightening and fixing the cylinder head to the mounting base, the hole communicating with the cooling water passage is covered with a blind cover, making it possible to supply pressurized water to the cooling water passage within an extremely short period of time. Improves efficiency. Moreover, the device of the present invention has an extremely simple structure and can be easily manufactured.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is an overall schematic diagram showing the water pressure test state, Fig. 2 is a top view of the cylinder head, Fig. 3 is a bottom view of the cylinder head, and Fig. 4 is a pedestal. and a front view of the mounting base, and FIG. 5 is a sectional view taken along the line -- in FIG. 4. 1... Cylinder head, 2... Leg stand, 3... Mounting base, 4... Cooling water passage, 5... Cooling water outlet, 6
... Pressurized water supply means, 18-23 ... Hole, 24-
33...Insertion hole, 46...Spindle, 47...Top surface,
48...Observation hole, 49-54...Blind lid, 55,5
6... Tightening bolt, 57... Bolt hole, 59...
Support means.

Claims (1)

[Claims] 1. A mounting base for mounting and fixing the cylinder head is rotatably supported on a leg base by a horizontal support shaft, and an observation hole is bored in the center of the mounting base. At the same time, an elastic blind cover corresponding to the cooling passage holes opened on the lower surface of the cylinder head and covering those holes is fixed to the upper surface of the mounting base, and is further bored in the cylinder head to fix the cylinder head to the cylinder block. At least two tightening bolts are erected on the top surface of the mounting base in pairs corresponding to at least two of the plurality of bolt insertion holes, and at least two tightening bolts are provided in pairs corresponding to at least one of the remaining bolt insertion holes. At least one bolt hole is drilled, a rotating arm extending on the opposite side of the support shaft is fixed to the mount, and the pedestal supports the mount at an angle corresponding to the mounting angle of the cylinder head. At the same time, a supporting means is provided which can freely release the supported state, and a pressurized water supply means for supplying pressurized water at a predetermined pressure to the cooling water passage is connected to the cooling water outlet of the cylinder head. A hydraulic testing device for cylinder heads featuring: