Lance nozzle and excess sprayed coating removal device including the same

An apparatus comprising:

• a multi-cylinder engine including a cylinder block with a plurality of cylinder bores and a crank chamber, the crank chamber being separated by a partition wall with a communication hole to form a plurality of small chambers;
• a moving device;
• a spindle casing;
• a lance nozzle that injects fluid, the lance nozzle comprising:
• a shaft body internally including a flow path of the fluid;
• a first nozzle hole disposed on a leading end side of the shaft body, the first nozzle hole configured to generate a first jet in a first injecting direction, the first injecting direction being a direction inclining to a base end side of the shaft body with respect to a direction perpendicular to an axial direction of the shaft body;
• and
• a second nozzle hole disposed on a base end side of the first nozzle hole in the shaft body, the second nozzle hole configured to generate a second jet in a second injecting direction, the second injecting direction being a direction inclining to a leading end side of the shaft body with respect to a direction perpendicular to an axial direction of the shaft body, wherein:
• the lance nozzle is configured to remove excess sprayed coating on the crank chamber of the cylinder block of the multi-chamber engine,
• the first nozzle hole has an inclination angle θ1 formed by the first injection direction and the axial direction of the shaft body satisfying a following formula 1,
• the second nozzle hole has an inclination angle θ2 formed by the second injection direction and the axial direction of the shaft body satisfying a following formula 2:
• tan
• -
• 1
• ⁡
• (
• T
• 2
• ⁢
• D
• )
• ≤
• θ
• 1
• <
• 90
• ⁢
• °
• [
• Formula
• ⁢
• ⁢
• 1
• ]
• 0
• <
• θ
• 2
• ≤
• tan
• -
• 1
• ⁡
• (
• T
• D
• )
• [
• Formula
• ⁢
• ⁢
• 2
• ]
• where
• D:
• representative length of the communication hole;
• and
• T:
• representative thickness of the partition wall,
• the lance nozzle is arranged on the spindle casing, the lance nozzle configured to insert into the small chamber, such that the lance nozzle is inserted into the small chamber in a direction along an axial direction of the cylinder bore, and
• a shield having a block portion configured to intercept the first jet and the second jet, the shield configured to insert into the small chamber so as to face another cylinder bore different from one cylinder bore among the pair of the cylinder bores communicating with the small chamber, the shield configured to protect a sprayed coating on an inner surface of the other cylinder bore from the first jet and the second jet when the lance nozzle is inserted into the small chamber.