1. Repair of the end face of the gear oil pump and the wear of the pump cover
There is a certain gap between the end face of the gear and the inner plane of the pump cover, which is called the end face clearance. The wear caused by the contact surface between the gear end face and the inner surface of the pump cover during operation will increase the gap of the end face, and when the limit is exceeded, the pump oil quantity will have a significant influence.
When the end face of the gear is worn, the end face can be flattened, and the exploded surface of the oil pump casing can be re-grounded to ensure that the end face clearance of the pump is within the required range.
2. Repair of the drive shaft and bushing of diesel gear oil pump after wear
Due to the weight of the driving gear of the oil pump and the radial thrust generated when the driven gear meshes, it is easy to cause the shaft and the bushing hole to be eccentric, and the gap is increased. Therefore, during operation, the gear pump will leak due to the increase of the clearance, and the oil supply will be reduced.
After the drive shaft and bushing are worn, the trimming or trimming method can be used to restore the fit clearance. When the journal wear is slight, it is only necessary to press out the old bushing and replace it with a new bushing, and the shaft can generally not be repaired, so that the matching clearance can be restored to the allowable range. When the shaft and bushing wear is very serious, when the matching clearance is greatly increased, not only the bushing needs to be replaced, but also the shaft is also chrome-plated or vibrated to increase the diameter, and then ground to the standard size to restore the journal and Bushing requirements.
3. Repair of the inner cavity of the pump casing and the teeth after wear
After the inner cavity of the pump casing and the teeth are worn, the amount of oil in the pump is greatly affected. Gear pump When the shaft and bushing or shaft hole wear is severe, the tooth top and the inner surface of the pump casing will have undue contact during operation. Moreover, since the oil discharge chamber is higher than the pressure in the oil inlet chamber, under the pressure difference, the tooth tip contacts more with the oil inlet chamber of the pump casing, so the inner cavity of the pump casing wears more here, so that the inner cavity and the tooth The top gap increases. As a result, the pressure difference between the oil inlet and outlet of the oil pump is reduced, so that the oil scraping and oil pressure are reduced, and the oil supply pressure is lowered, and the pump oil quantity is reduced. The wear of the inner cavity of the pump casing is generally repaired by the cavity setting method.