The used for natural gas engine cylinder head
Technical field
The utility model relates to the natural gas engine technical field, especially relates to a kind of used for natural gas engine cylinder head.
Background technique
Pass through interference fit seal between cylinder cover of natural gas engine of the prior art and spark plug lining, easily pressing local derviation to cause cylinder head when the spark plug lining is pressed into cylinder head leaks, if water enters cylinder along spark plug, will cause difficulty in starting and the fault that is short of power.Simultaneously, spark plug lining mounting hole of the prior art is inclined hole with respect to the cylinder head bottom plane, is not easy to processing and assembling.
The model utility content
Technical problem to be solved in the utility model is: a kind of used for natural gas engine cylinder head is provided, and good airproof performance is convenient to processing and assembling simultaneously.
For solving the problems of the technologies described above, the technical solution of the utility model is: the used for natural gas engine cylinder head, comprise the cylinder head body, described cylinder head body is provided with spark plug lining mounting hole, and the bottom of described spark plug lining mounting hole is provided with the internal thread that cooperates and have sealability with the spark plug lining.
Preferably, the inner peripheral surface on the top of described spark plug lining mounting hole is provided with the annular groove that at least one is used for installing seal ring.
Preferably, the axis of described spark plug lining mounting hole is vertical with the installation end face of cylinder head.
Adopted technique scheme, the beneficial effects of the utility model are: owing to having designed above-mentioned used for natural gas engine cylinder head, the bottom of spark plug lining mounting hole is provided with the internal thread that cooperates and have sealability with the spark plug lining, by screw-thread fit sealing, effectively avoided the difficulty in starting that motor causes because of infiltration and be short of power between cylinder head and spark plug lining.
Because the inner peripheral surface on the top of spark plug lining mounting hole is provided with for the annular groove that seal ring is installed, and has further strengthened the sealing between cylinder head and spark plug lining.
Because the axis of spark plug lining mounting hole is vertical with the installation end face of cylinder head, is convenient to the processing of spark plug lining mounting hole and the assembling of spark plug lining.
Description of drawings
Accompanying drawing is the utility model embodiment's structural representation;
Wherein: 1, cylinder head body; 2, spark plug lining mounting hole; 3, spark plug lining; 4, seal ring; 5, annular groove; 6, seal washer.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
As shown in drawings, the used for natural gas engine cylinder head, comprise cylinder head body 1, cylinder head body 1 is provided with spark plug lining mounting hole 2, the bottom of spark plug lining mounting hole 2 is provided with the internal thread that cooperates and have sealability with spark plug lining 3,3 of cylinder head body 1 and spark plug linings seal by screw-thread fit, effectively avoided the difficulty in starting that motor causes because of infiltration and be short of power, need to prove, the screw thread with sealability in the present embodiment is adopted as the sealing thread at 55 ° of angles.The inner peripheral surface on the top of spark plug lining mounting hole 2 is provided with two annular grooves 5 that are used for installing seal ring 4, has further strengthened the sealing of 3 of cylinder head body 1 and spark plug linings.The axis of spark plug lining mounting hole 2 is vertical with the installation end face of cylinder head body 1, is convenient to the processing of spark plug lining mounting hole 2 and the assembling of spark plug lining 3.
Certainly, the quantity of annular groove 5 also can be one or more; In addition, be provided with seal washer 6 in the threaded connection place of spark plug lining mounting hole 2 and spark plug lining 3.
The utility model is not limited to above-mentioned concrete mode of execution, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done all drop within the protection domain of the present utility model.