JPS6350402Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an internal combustion engine exhaust valve.

Conventionally, bolting has been widely used as a method for fixing ceramics to the contact surface side of a combustion engine exhaust valve. However, according to this method, although the structure is relatively simple, a part of the bolt is directly exposed to high temperature, so there is a problem that the exhaust valve cannot be used at a high temperature.

The present invention aims to solve such problems, and includes a ceramic disk having a short cylindrical engagement protrusion on the back surface, and a groove on the bottom surface that can fit into the engagement protrusion. and a ring-shaped exhaust valve peripheral component member having a threaded groove on its inner circumferential surface and provided with a radial bolt threaded hole leading to the groove; A fixing bolt for fixing the ceramic disk and the exhaust valve peripheral edge component, and an exhaust valve main body having a lower end screwed into an inner circumferential surface thread groove of the exhaust valve peripheral edge component. This objective is achieved by providing an internal combustion engine exhaust valve constructed of the same structure, which eliminates the need to expose the fixing bolt that fixes the ceramic disc to the exhaust valve body to the ignition surface, and allows the operating temperature to be It is possible to take a high value.

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

In the figure, reference numeral 1 denotes a ceramic disc facing the contact surface, and a short cylindrical engagement protrusion 2 is provided on the back surface. Reference numeral 3 designates a ring-shaped exhaust valve peripheral component member, which is provided with a groove 4 on its lower surface that can be fitted with the engagement protrusion 2, and has a threaded groove 5 on its inner circumferential surface, and is provided with a threaded groove 5 in the radial direction leading to the groove 4. A plurality of screw holes 6 for bolts are provided in the circumferential direction. 7
8 is a metal buffer material for fixing interposed between the inner circumferential surface of the engagement protrusion 2 and the groove 4, and 8 is a fixing bolt with a hexagonal socket screwed into each bolt hole 6. , serves to fix the fitted ceramic disc 1 and the exhaust valve peripheral edge component 3. 9 is the exhaust valve main body, and the exhaust valve peripheral part component 3
The lower end is screwed into the inner circumferential surface thread groove 5 of. Note that the exhaust valve main body 9 and the exhaust valve peripheral component member 3 are made of, for example, heat-resistant steel, and the fixing metal buffer material 7 is made of, for example, a copper alloy. Further, the ceramic disk 1 is made of heat-resistant and heat-insulating ceramics, such as silicon nitride, silicon carbide, or zirconia.

Next, the assembly sequence of the internal combustion engine exhaust valve according to the present invention will be described. First, the engaging protrusion 2 of the ceramic disc 1
and the concave groove 4 of the exhaust valve peripheral component member 3 are fitted together with the fixing metal buffer material 7 disposed on the inner peripheral surface of the engagement protrusion 2 . Next, fixing bolts 8 with hexagonal sockets are screwed into each bolt hole 6 so as to be embedded therein, thereby reliably fixing the ceramic disk 1 and the exhaust valve peripheral component member 3. Then, the lower end of the exhaust valve main body 9 is screwed into the inner circumferential surface thread groove 5 of the exhaust valve peripheral portion constituent member 3, thereby completing the internal combustion engine exhaust valve.

As described above, according to the present invention, the fixing bolt that fixes the ceramic disc to the exhaust valve body does not need to be exposed to the ignition surface. Therefore, the operating temperature can be set high.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of an internal combustion engine exhaust valve showing an embodiment of the present invention. 1... Ceramics disc, 2... Engaging protrusion, 3
... Exhaust valve peripheral part component, 4 ... Concave groove, 5 ...
Thread groove, 6... Screw hole for bolt, 8... Hexagon socket fixing bolt, 9... Exhaust valve body.

Claims (1)

[Scope of utility model registration request] A ceramic disc is provided with a short cylindrical engagement protrusion on its back surface, a groove that can fit into the engagement protrusion on its lower surface, and a threaded groove on its inner circumferential surface. a ring-shaped exhaust valve peripheral component member provided with a radial screw hole for a bolt, and a fixing member that is screwed into the bolt screw hole and fixes the ceramic disc and the exhaust valve peripheral component member. An internal combustion engine exhaust valve, comprising: a bolt; and an exhaust valve main body, the lower end of which is screwed into a threaded groove on the inner circumferential surface of the exhaust valve peripheral component.