A gear pump for transporting a fluid includes a pump casing; and a gear assembly which is accommodated in the pump casing. The gear assembly includes a driving gear, a driven gear that mashes with the driving gear, a driving gear shaft to which the driving gear is attached, a driven gear shaft to which the driven gear is attached, and a bearing frame that rotatably supports the driving gear shaft and rotatably supports the driven gear shaft.

A pump particularly for pumping abrasive and/or chemically aggressive liquids includes at least one rotating pumping member having a respective shaft, the at least one rotating pumping member being at least partially housed inside a pump body. The shaft is rotatably supported by at least one support associated with the pump body.

The shaft and the at least one support are both at least partially made of a material having a hardness greater than or equal to 5 Mohs, where the material having a hardness greater than or equal to 5 Mohs is located at least in the areas of the shaft and of the support in mutual contact.

In a method for monitoring a pump arranged in a flow path to pump a fluid, the temperature of a fluid is regulated by a tempering element during the operation of the pump. The regulation of the temperature may include detecting at least one status point which is formed from an energy supplied to the tempering element and a temperature slope of the tempering element. The status point may be determined in a hazard range by checking whether the status point is located outside of a normal status range, which means that the lifespan of the pump is limited.

In a method for monitoring a pump arranged in a flow path to pump a fluid, the temperature of a fluid is regulated by a tempering element during the operation of the pump. The regulation of the temperature may include detecting at least one status point which is formed from an energy supplied to the tempering element and a temperature slope of the tempering element. The status point may be determined in a hazard range by checking whether the status point is located outside of a normal status range, which means that the lifespan of the pump is limited.

A pump particularly for pumping a liquid such as ink, paint, glue or the like, includes at least one rotating pumping member having a respective shaft. The at least one rotating pumping member being at least partially housed inside a pump body, the shaft being rotatably supported by at least one support associated with the pump body.

The shaft has on its external cylindrical surface in contact with the liquid one, or more recesses, or the at least one support includes on its internal cylindrical surface in contact with the liquid, one or more recesses.

A pump particularly for pumping a liquid such as ink, paint, glue or the like, includes at least one rotating pumping member having a respective shaft. The at least one rotating pumping member being at least partially housed inside a pump body, the shaft being rotatably supported by at least one support associated with the pump body. The shaft has on its external cylindrical surface in contact with the liquid one, or more recesses, or the at least one support includes on its internal cylindrical surface in contact with the liquid, one or more recesses.

A gear pump includes a pump casing and a gear assembly. The gear assembly includes a driving gear, a driven gear, a driving gear shaft, a driven gear shaft, and a bearing frame. The bearing frame includes a frame main body, a pair of driving side bearing portions, and a pair of driven side bearing portions. The frame main body has a pair of bearing support portions, in which the driving side bearing portion and the driven side bearing portion are provided, and a connecting portion which connects the bearing support portions. The bearing support portions and the connecting portion are integrated together as a one-piece member.

To reduce frictional heat generated between a rotation shaft and a bearing portion in a gear pump in which the rotation shaft having a gear mounted thereon is received by the bearing portion and an image recording apparatus having the gear pump. Provided is a gear pump which has a rotation shaft, a bearing portion which receives the rotation shaft, and a gear which is mounted on the rotation shaft and rotates with the rotation shaft, in such a manner that the gear feeds liquid. Furthermore, at least either a concave portion or a convex portion is provided in at least either the rotation shaft or the bearing portion.

A gear pump includes a pump casing and a gear assembly. The gear assembly includes a driving gear, a driven gear, a driving gear shaft, a driven gear shaft, and a bearing frame. The bearing frame includes a frame main body, a pair of driving side bearing portions, and a pair of driven side bearing portions. The frame main body has a pair of bearing support potions, in which the driving side bearing portion and the driven side bearing portion are provided, and a connecting portion which connects the bearing support portions. The bearing support portions and the connecting portion are integrated together as a one-piece member.

To reduce frictional heat generated between a rotation shaft and a bearing portion in a gear pump in which the rotation shaft having a gear mounted thereon is received by the bearing portion and an image recording apparatus having the gear pump. Provided is a gear pump which has a rotation shaft, a bearing portion which receives the rotation shaft, and a gear which is mounted on the rotation shaft and rotates with the rotation shaft, in such a manner that the gear feeds liquid. Furthermore, at least either a concave portion or a convex portion is provided in at least either the rotation shaft or the bearing portion.