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  Method of forming coat on inner surface of bearing and apparatus for the sameUSPTO Application #: 20060013952Title: Method of forming coat on inner surface of bearing and apparatus for the same Abstract: There is provided a method of forming a coat on an inner surface of a bearing, in which a jig 13 is attached to a rotor 2 while holding four bearings 12 for example, so as to form those in a cylinder shape. Then, while the rotor 2 is rotated at a circumferential speed of 0.3 m/sec, a nozzle 8 for airless spraying is inserted into the rotor 2, so that the nozzle 8 injects a coating material 30 from the inside of the bearings 12 toward an inner surfaces of the bearings 12 to apply the coating material thereon. Because the coating material 30 is injected from the nozzle 8 without using compressed air, the fly amount of the coating material is made less as compared to air spray painting. (end of abstract) Agent: Rader Fishman & Grauer PLLC - Washington, DC, US Inventors: Tsuyoshi Nakashima, Takuya Tanaka, Weixing Zhong, Takayuki Shibayama USPTO Applicaton #: 20060013952 - Class: 427230000 (USPTO) Related Patent Categories: Coating Processes, Interior Of Hollow Article Coating The Patent Description & Claims data below is from USPTO Patent Application 20060013952. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority based on Japanese Patent Application No. 2002-283293, filed Sep. 27, 2002, the entirety of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a method of forming a coat on an inner surface of a bearing having a cylinder shape and an apparatus for forming the coat. [0004] 2. Description of the Prior art [0005] Conventionally, for the purpose of improving conformability and anti-seizure property, a synthetic resin coat has been formed on an inner surface of a half bearing having a semi-cylinder shape, for example. The coat often includes a base resin made of a synthetic resin in which a solid lubricant is contained. As a method of forming such a coat, there have been known a plurality of methods as follows. [0006] (1. Air Spray Method) [0007] As shown in FIG. 4, in the case of a half bearing for example, while two half bearings 101 are held by a jig (not shown) to be combined into a cylinder shape and while the bearings 101 are rotated in their circumferential direction together with the jig, a coating material 103 (a mixture of a base resin and a solid lubricant) for forming a coat is injected from diagonally above the bearings 101 (approximately at 45 degree from above the bearings 101) toward an inner surface of each bearing 101 using a nozzle 102 by the air spray method, to apply the coating material thereon. Then, the jig is turned upside down, and the coating material is applied also from the opposite side in the same manner. Thereafter, the base resin is cured. [0008] (2. Printing Method) [0009] A coating material for forming a coat is applied on a printing surface of a pad, then the printing surface is pressed onto an inner surface of a bearing to transfer the coating material thereon. Thereafter, the coating material is cured. [0010] (3. Immersion Method) [0011] A bearing is directly immersed in a coating material to deposit the coating material on an inner surface of the bearing, and then the bearing is drawn from the coating material and undergoes curing. [0012] (4. Roll Coat Method) [0013] A coating material for forming a coat is dropped on a transfer roll, and the transfer roll and a printing roll are rotatably contacted with each other to transfer the coating material on the printing roll. Then, a bearing (a back plate) having a semi-cylinder shape is engaged between the printing roll and a backup roll such that an inner surface of the bearing contacts with the printing roll to apply the coating material on the inner surface of the bearing. Thereafter, the coating material is cured (see page 4 and FIGS. 2 and 3 of JP-A-2001-304264, for example). BRIEF SUMMARY OF THE INVENTION [0014] However, each of the above described methods has the following disadvantages. [0015] In the case of the air spray method, since the method adopts atomizing the coating material by using compressed air, the coating material flies in all directions. Therefore, the yield percentage of the coating material is low, and the working conditions are made bad. [0016] In the case of the printing method, since the coating material is pressed onto a surface to transfer the coating material thereon, the dimensional accuracy of the coat thickness is low. [0017] In the case of the immersion method, it is difficult to control the concentration of the solid lubricant to be mixed in the coating material. [0018] In the case of the roll coat method, because of a change in viscosity of the coating material, a dimension of the coat thickness tends to be varied, and therefore the dimensional accuracy is low. [0019] The present invention was achieved in consideration of the above circumstances, and a first object thereof is to provide a method of forming a coat on an inner surface of a bearing, by which the yield of the coating material and the working conditions can be improved as compared to the air spray method, the concentration of the coating material can be readily controlled as compared to the immersion method, and the dimensional accuracy of the coat thickness can be improved as compared to the printing method and the roll coat method. In addition, a second object of the invention is to provide an apparatus for forming a coat on an inner surface of a bearing to achieve the above object. [0020] In order to achieve the first object described above, according to a first aspect, the invention is characterized in that, in a method of forming a coat on an inner surface of a bearing having a cylinder shape, while rotating the bearing in its circumferential direction, injecting a coating material for forming the coat from a nozzle by airless spray painting, to apply the coating material on the inner surface of the above described bearing. [0021] According to the above described method, because the coating material is injected from the nozzle by the airless spray painting and compressed air is not used in contrast to air spray painting, the coating material flying in all direction is less, the yield percentage of the coating material is improved, and the working conditions are also improved. In addition, in the case of the airless spray painting, the coating material can be applied from a nearer point to a work as compared to the air spray painting. Further, because of spray painting, the concentration of the coating material can be readily controlled as compared to the immersion method. Furthermore, because it is possible to stack thin film by the spray painting, the dimensional accuracy of the coat thickness can be improved as compared to the printing method and the roll coat method. Continue reading... Full patent description for Method of forming coat on inner surface of bearing and apparatus for the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method of forming coat on inner surface of bearing and apparatus for the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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