Gear pump device for rubber extrusion

A gear pump device for rubber extrusion,

• which has a pair of gears engaged with each other, a housing having a gear-housing bore housing a pair of the gears, and a bushing ring inserted in the gear-housing bore at end portions thereof in the axial direction, and
• which is characterized in that
• the gear has a gear portion and a shaft portion concentrically extending from the gear portion toward both sides in the axial direction,
• the bushing ring has a bearing and a sealing means built-in, the bearing rotatably supporting the support-shaft portion, and the sealing means disposed inward of the bearing in the axial direction and sealing between it and the outer peripheral surface of the support-shaft portion, and
• the sealing means includes a sealing ring which is formed from a rubber elastic body whose cross section is ]-shaped and which has a cylindrical first lip portion contacting with the outer peripheral surface of the support-shaft portion, a cylindrical second lip portion disposed outside thereof in the radial direction, and a side wall portion connecting between axially outer ends of the first and second lip portions.