Fig. 4-4 Gas pressure action (apex seal)
Gas Seals
The three gas seals are fitted in the rotor grooves, each with a spring. These maintain the airtightness of three working chambers of the rotor. The spring tension of the apex seal is applied to maintain the airtightness between the rotor housing's trochoid surface and the rotor. The side seal performs the same function between the intermediate or the side housing and the rotor. The corner seal seals the remaining space (between the ends of the apex seal and the ends of the side seal).
During engine operation, the airtightness is even further improved by the fact that gas pressure is applied to the lower portion of the seals as shown in the figure 4-4.
Fig. 4-5 Three-piece apex seal mechanism
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