JPH0567475U - 4th pusher jig for disassembling ship engine intake / exhaust valve - Google Patents

Abstract

(57) [Summary] [Objective] To provide a jig capable of simultaneously disassembling four valves of each cylinder of a marine engine. [Structure] A cylinder is composed of a bottom plate formed by passing a bolt through a hole of a fuel valve of a cylinder head and formed coaxially with the bolt, and a fourth plate corresponding to the position of each valve and the size of the valve rotator of the valve. The valve rotator was sandwiched from the bottom of the head, and the cotter pin was floated so that it could be easily removed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a jig used for disassembling an intake / exhaust valve on a cylinder head of a power generating prime mover installed in an engine room of a ship.

[0002]

[Prior Art]

 The power generating prime mover installed in the engine room of a ship, after being used for a predetermined period of time, caused carbon and other substances to adhere to the valves and intake and exhaust holes of the intake and exhaust systems, causing problems such as reduced engine efficiency. In particular, when carbon builds up on the surface of the cylinder head that is in contact with the combustion gas, it hinders combustion, and scale adheres to the cooling water, which hinders the cooling effect. Also, cracks may occur in the head due to the heat load during operation, so it is necessary to periodically disassemble and clean the head. Most of the power generation engines installed in the engine room of a ship are usually of the 6-cylinder type, and each cylinder (cylinder) consists of 4 intake and exhaust holes for 2 intake systems and 2 exhaust systems, and a total of 4 valves. Intake and exhaust valves are provided.

FIG. 3 shows a plan view of each cylinder head. In FIG. 3, 31 is a cylinder head, 32 is an intake port, and 33 is an exhaust port. Further, 36 to 39 are cap nuts for mounting the valve pressing guide, which are provided on the cylinder head 31 at six positions respectively. Further, 40 is a hole for the fuel valve, and fuel valve mounting cap nuts 41, 42 are provided around the hole.

By the way, the four intake and exhaust valves provided on the cylinder head 31 are, from the top, a valve head 45, 48, 51, 54 and a cotter (clasp) divided into two parts around the valve head 45, 48, 51, 54. Each of the cotter pins 46, 49, 52, 55 has a valve rotator 47, 50, 53, 56 below the cotter pin 46, 49, 52, 55 which is pressed upward by a spring (not shown in FIG. 3) so that each valve is It is configured to be in close contact with an intake / exhaust sheet (not shown in FIG. 3).

FIG. 4 is a schematic sectional view of one valve for the purpose of understanding the outline of each valve mechanism. 4, 31 is a schematic sectional view of a part of the cylinder head 31 having the valve head 45, the cotter pin 46 and the ball rotator 47 shown in FIG. 3, and in FIG. 4, 60 denotes the cylinder head 31. An intake valve or an exhaust valve provided penetrating therethrough, and a reference numeral 61, similarly, is an intake or exhaust guide provided in the cylinder head 31. A head groove 45 of the valve body 60 is provided with a pin groove 62 having a diameter smaller than the head diameter in the neck portion, and the cotter pin 46 that can be divided into two is meshed with the groove 62. Composed.

As described above, the cotter pin 46 is joined to the valve rotator 47 from below, and the valve rotator 47 is pressed by the spring 63 from below.

Therefore, in order to remove the valve body 60 from the cylinder head 31, when the valve rotator 47 is pushed down, a gap is created between the pin groove 62 and the cotter pin 46, and the cotter pin 46 is separated and removed.

Then, the valve head 45 can penetrate the guide 61 without resistance, and the valve body 60 can be removed from the cylinder head 31.

As this type of valve disassembling jig, one shown in FIG. 6 is known. This valve disassembling jig has a structure shown in FIG. 6, and the usage state is used as shown in FIG. That is, the valve spring attaching / detaching tool 70 is attached to the valve holding guide attaching cap nut 36 of the cylinder head 31. The valve spring attaching / detaching handle 71 applies the attached hollow semi-cylindrical valve rotator retainer 72 to the valve rotator 47, and rotates the handle to push the valve rotator 47 downward to take out the cotter pin 46. As in the case of the valve disassembly jig 64 described above, the valve body 60 is removed from the cylinder head 31.

[0010]

[Issues to be solved by the device]

 As described above, most of the power generation engines installed in the engine room of a ship are usually of the 6-cylinder type, and each cylinder (cylinder) consists of four valves with two intake systems and two exhaust systems. Therefore, when inspecting and cleaning this, it was disassembled one by one, so the work efficiency was poor.

Further, since the bolt holes used for other purposes such as the fuel valve mounting cap nuts 41, 43 or 40, 42 are used, the bolt holes may be damaged during work. There was a danger of.

[0012]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a bottom plate disposed below a cylinder head 31 and a support bolt rotatably attached to the bottom plate to penetrate a fuel valve hole 40 of the cylinder head 31, According to the valve arrangement of each cylinder, the support bolt is penetrated by a fourth plate with a fourth structure that is applied to each valve rotator, and a thrust nut is sandwiched between them to form a fitting nut. This is the fourth pusher jig for valve disassembly.

[0013]

[Action]

 A bolt penetrates the hole of the fuel valve of the cylinder head, and the valve rotator is sandwiched from the bottom of the cylinder head by the bottom plate and the fourth plate formed coaxially with this bolt. Since the four valves can be disassembled at the same time and no other bolt holes are utilized, the risk of damaging them can be avoided.

[0014]

【Example】

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of an embodiment of a fourth pusher jig for disassembling a marine engine intake / exhaust valve according to the present invention. In FIG. 1, reference numeral 1 denotes a bottom plate arranged on the bottom surface of the cylinder head, and a support bolt 2 is rotatably provided on the bottom plate 1. 3 is a fourth plate that penetrates the support bolt 2, and the fourth plate 3 has circular punched portions 6 to 9 corresponding to the position and size of the valve rotator of each valve. It is configured so that the eye plate 3 can be freely moved. Reference numeral 4 denotes a thrust bearing, which does not transmit its rotational force to the fourth plate 3 even if the fitting nut 5 provided above the thrust bearing rotates, but the fitting nut 5 rotates and As the compound nut 5 is inserted into the support bolt 2, it is movable downward. The fitting nut 5 is constructed so that it can be tightened or loosened using an air screwdriver (air impact) on the head.

FIG. 2 shows an example of use of the fourth pusher jig for disassembling the marine engine intake / exhaust valve according to the position embodiment of the present invention. FIG. 2 shows a cross section of the valve head portions 45 and 54, and the same parts as those shown in FIGS. 3 and 4 are the same parts. As is apparent from FIG. 2, the fourth punched plate 3 is configured such that the circular punched portions 6 and 7 are applied to the valve rotors 56 and 47 and sandwiched between it and the bottom plate 1. When the fitting nut 5 is rotated by an air screwdriver (not shown), the fourth plate 3 is pushed down, and thereby the valve rotators 56 and 47 are pushed down. ing.

In FIG. 2, reference numerals 10 and 11 denote legs arranged at the bottom of the bottom plate 1, which are provided at four locations on the bottom evenly or at appropriate intervals so that the bottom surface of the cylinder head is formed during operation. Protects against damage.

In this embodiment, as the support bolt, a threaded structure is used as a whole, and depending on the model, it is possible to cope with different cylinder head thicknesses.

Further, when performing valve disassembling work for a variety of engines in which the four valve positions of each cylinder (cylinder) are different, it is necessary to prepare various fourth plates corresponding to the valve positions in advance. , It is possible to easily disassemble valves for various types of engines.

[0020]

【effect】

 According to the present invention, the disassembling work of the four valves arranged in each cylinder can be performed at the same time, and the working time can be greatly reduced. Particularly, since the tightening and loosening work of the fitting nut can be performed by an air screwdriver (not shown), this also contributes to the improvement of work efficiency.

Further, since it is not necessary to use bolt holes and the like used for other purposes, there is no risk of damaging the cylinder head or the like. Also, since the jig itself is not attached to the cylinder head with a screwed structure, there is less risk of damaging the jig itself, and durability and safe work can be performed.

Further, since the valve disassembling work can be performed easily and without risk of damage, the valve disassembling work can be performed frequently, and as a result, the carbon deposited on the surface of the cylinder head in contact with the combustion gas is found. As a result, it is possible to avoid the inhibition of combustion, the inhibition of the cooling effect due to the adhesion of scale to the cooling water, and the like. Further, there is an effect that it is possible to prevent the occurrence of cracks in the head due to heat load during operation due to the adhesion of carbon.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of a fourth pusher jig for disassembling a marine engine intake / exhaust valve according to the present invention.

FIG. 2 is a view showing an example of use of a fourth pusher jig for disassembling a marine engine intake / exhaust valve according to a position embodiment of the present invention.

FIG. 3 is a plan view of each cylinder head.

FIG. 4 is a schematic cross-sectional view of a valve mechanism.

FIG. 5 is a view showing a conventional valve disassembly jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bottom plate, 2 ... Support bolt, 3 ... 4th plate, 5 ... Fitting nut, 6 ... Circular punching part, 7 ... Circular punching part, 8 ... Circular punched part, 9 ... Circular punched part, 31 ... Cylinder head, 34 ... Valve holding guide mounting bag nut, 35 ... Valve holding guide mounting bag nut, 36 ... Valve holding guide mounting bag Nuts, 37 ... Valve guide guide mounting cap nuts, 38 ... Valve press guide mounting cap nuts, 39 ... Valve press guide mounting cap nuts, 40 ... Fuel valve holes, 41 ... Fuel valve Mounting cap nut, 42 ... Fuel valve mounting cap nut, 45 ... Valve head, 46 ... Cotter pin, 47 ... Valve rotator, 48 ... Valve head, 49 ... Cotter pin, 50 ... Valve rotator 51 ... Valve head, 52 ... Cotter pin, 53 ... Valve rotator, 54 ... Valve head, 55 ... Cotter pin, 56 ... Valve rotator, 60 ... Valve main body, 61 ... Exhaust hole, 62 ... Pin groove, 62 ... Groove, 63 ... Spring 70 ... Valve spring attaching / detaching tool, 71 ... Valve spring attaching / detaching handle, 72 ... Hollow semi-cylinder Model valve rotator retainer,

Claims (3)

[Scope of utility model registration request] 1. A bottom plate disposed below a cylinder head, a support bolt rotatably attached to the bottom plate, a fuel valve hole of the cylinder head, and a valve arrangement and a valve head of each cylinder. A fourth plate having a fourth structure that is applied to each valve rotator corresponding to the size of the valve rotator provided in the rotator, and a fitting bolt that is fitted to the support bolt and moves downward according to the rotation thereof. A fourth pusher jig for disassembling the intake / exhaust valve of a marine engine, which is composed of 2. The fourth pusher jig for disassembling a marine engine intake / exhaust valve according to claim 1, wherein the fitting bolt has a head portion that fits into a box wrench having an air screwdriver. 3. A fourth pusher cure for disassembling a marine engine intake / exhaust valve according to claim 1, wherein a thrust bearing is sandwiched between the fourth plate and the fitting bolt. Ingredient