Laminated rubber hose and method for manufacturing the same

A method for manufacturing a laminated rubber hose that includes a first layer and a second layer laminated on an outer surface of the first layer,

• the first layer being formed from a rubber material containing a thermosetting resin in an amount of 2.0 parts by mass or more and 4.0 parts by mass or less relative to 100 parts by mass of a rubber component,
• the second layer being formed from a rubber material containing a thermosetting resin in an amount of 2.0 parts by mass or more and 4.0 parts by mass or less relative to 100 parts by mass of a rubber component,
• the method comprising laminating the second layer on the outer surface of the first layer without using an adhesive with the outer surface of the first layer maintained at a temperature range of 65° C. or more and 105° C. or less, wherein:
• the first layer includes an ethylene-propylene-diene rubber as the rubber component,
• the second layer includes an ethylene-propylene-diene rubber as the rubber component,
• the thermosetting resin contained in the first layer and the second layer includes at least a phenolic resin and a melamine resin,
• at the laminating, vacuuming is performed on the first layer at 0.03 MPa or more and 0.08 MPa or less to make the first layer in an expanded state;
• at least one of the rubber material forming the first layer or the rubber material forming the second layer contains sulfur;
• and
• the first layer and the second layer adhere at least partially to each other, and adhesive strength between the first layer and the second layer is 25 N/cm or more.