Abstract A rotary piston internal combustion engine of the trochoidal type with a housing. The engine includes at least one peripheral wall portion and at least two parallel side portions and has induction and exhaust ports. Each peripheral wall portion and two associated side portions define a cavity in which a multi-apex piston is rotatably mounted to define variable volume working chambers. The piston is provided with seal elements which are in sliding engagement with the inner surfaces of the housing. The seal elements are provided with a passage for lubricating the inner surfaces of the housing with the passage opening into the cavity in the neighborhood of each induction port in the region of that working chamber which is undergoing the induction phase. The passage is in communication with the atmosphere and has a lubricant feed pipe opening into it. A restriction is provided in the passage between its point of entry into the cavity and the point of entry of the lubricant feed pipe. The restriction has a cross sectional area for a flow of a maximum of about 30% of the idling air consumption of the engine. The point of entry of the passage into the cavity is arranged so that it is cut off by the piston at the latest at the instant of closing of the induction port or ports by the working chamber that is undergoing the induction phase.
A rotary piston internal combustion engine of the trochoidal type with a housing comprising: at least one peripheral wall portion and at least two parallel side portions and having induction and exhaust ports, each peripheral wall portion and two associated side portions definining a cavity in which a multi-apex piston is rotatably mounted to define variable volume working chambers, the piston being provided with seal elements which are in sliding engagement with the inner surfaces of the housing, and in which, for lubricating these inner surfaces, there is provided a passage which opens into the cavity in the neighbourhood of each induction port in the region of that working chamber which is undergoing the induction phase, which passage is in communication with the atmosphere and into which passage there opens a lubricant feed pipe, a restriction provided in the passage between its point of entry into the cavity and the point of entry of the lubricant feed pipe, the restriction having a cross sectional area for a flow of a maximum of about 30% of the idling air consumption of the engine, the point of entry of the passage into the cavity being arranged so that it is cut off by the piston at the latest at the instant of closing each induction port by the working chamber that is undergoing the induction phase.
Claim 2
Dependent Claim
224 words
A rotary piston internal combustion engine of the trochoidal type with a housing comprising: at least one peripheral wall portion and at least two parallel side portions and having induction and exhaust ports, each peripheral wall portion and two associated side portions definining a cavity in which a multi-apex piston is rotatably mounted to define variable volume working chambers, the piston being provided with seal elements which are in sliding engagement with the inner surfaces of the housing, and in which, for lubricating these inner surfaces, there is provided a passage which opens into the cavity in the neighbourhood of each induction port in the region of that working chamber which is undergoing the induction phase, which passage is in communication with the atmosphere and into which passage there opens a lubricant feed pipe, a restriction provided in the passage between its point of entry into the cavity and the point of entry of the lubricant feed pipe, the restriction having a cross sectional area for a flow of a maximum of about 30% of the idling air consumption of the engine, the point of entry of the passage into the cavity being arranged so that it is cut off by the piston at the latest at the instant of closing each induction port by the working chamber that is undergoing the induction phase.
Claim 3
Dependent Claim
63 words
A rotary piston internal combustion engine according to claim 1 in which the portion of the passage between the point of entry into the cavity and the restriction is formed by an axially extending bore within the peripheral wall portion parallel to its running surface, this bore being in communication with the cavity through troughs or recesses provided in the adjacent side portions.
Claim 4
Dependent Claim
27 words
A rotary piston internal combustion engine according to claim 1 in which a pin is located in the bore to reduce the cross section of the bore.