JPS6343419Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a mechanism for attaching and detaching a bearing support body in a refrigerant compressor with an oil pump.

Figures 1 and 2 show a conventional refrigerant compressor of this kind. In the figures, 1 is the crankcase, 2
is an oil pump assembly section, and this oil pump assembly section 2 includes a bearing support body 3, an oil pump body 4 and an oil pump shaft 4a incorporated in this body 3, a bearing metal 5, and a gasket 7 on the body 3. It consists of a lid 6, etc., which is attached with bolts 8. The rotational motion is transmitted to the oil pump shaft 4a by engaging the oil pump shaft 4a in a groove 10 provided at the end of the crankshaft 9. However, in such a device, when the oil pump assembly 2 is attached to the crankcase 1, before the oil pump shaft 4a engages with the groove 10 of the crankshaft 9, the inner guide surface 11 of the crankcase 1 and the bearing are connected. Since the outer diameter side guide surface 12 of the support body 3 contacts (meshes with), it is impossible to check whether the groove 10 of the crankshaft 9 and the oil pump shaft 4a are properly meshed during assembly, and the meshing is difficult. If the mounting bolts 13 were forcibly tightened without being fully tightened, the oil pump body 4 or the end of the crankshaft 9 could be damaged. Note that FIG. 2 is a process diagram showing the process of assembling the oil pump assembly into the crankcase, and shows the state immediately before the guide surfaces of the two come into contact with each other. Furthermore, there is a drawback that it is very difficult to remove the bearing support body 3 during disassembly because the guide surfaces of the crankcase 1 and the bearing support body 3 are in close contact with each other. The present invention has been made to eliminate the above-mentioned drawbacks, and one embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In FIG. 3, reference numeral 14 denotes two screw holes provided on the flange portion 3a at symmetrical positions with respect to the center of the bearing support body 3, and the screw size is the same as that of the mounting bolt 13 of the bearing support body 3. This screw hole 14 passes through the flange portion 3a. When removing the oil pump assembly 2 due to wear of the bearing metal 5, etc., first remove the mounting bolts 13.
3 and screwed into the screw hole 14 provided in the bearing support body 3, the oil pump assembly 2 can be easily removed. Further, in order to facilitate attachment of the oil pump assembly 2 to the crankcase 1, a relief portion 15 is provided in the outer guide portion (spigot) 12 of the bearing support body 3. That is, when inserting the oil pump part 2 into the crankcase 1, the oil pump shaft 4a and the groove 10 of the crankshaft 9 first engage with each other, and then the oil pump assembly part 2 is further inserted, so that the crankcase is closed. By providing a relief portion 15 in the outer circumferential direction at a position where the inner diameter guide surface 11 of the bearing support body 3 and the outer diameter guide surface 12 of the bearing support body 3 contact (mesh), the oil pump shaft 4a and the crankshaft are first separated. 9 groove 1
Since it is possible to confirm that the two screws are properly engaged, it is possible to prevent damage to the oil pump body or the end face of the crankshaft due to assembly errors, and the assembly work is facilitated. Also, the tip side of the outer diameter side guide surface 12 of the bearing support body 3 is directed toward the outer circumference (as a small diameter).
Since the bearing supporting body 3 is provided with relief, damage to the precision-machined guide surfaces and corners can be prevented when the bearing support body 3 is stored or transported as a single component. Moreover, the relief portion 15 is located between the groove 1 of the oil pump shaft 4a and the crankshaft 9.
Since it serves as a guide when fitting the parts 0 together, it has the effect of making the assembly work easier.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of a conventional refrigerant compressor with an oil pump, Fig. 2 is a diagram of its assembly process, and Fig. 3 is a sectional view of the main parts of an embodiment of the present invention, which is similar to Fig. 2. FIG. 4 is an external view of the bearing support body, and FIG. In the figure, 1 is a crankcase, 2 is an oil pump assembly, 3 is a bearing support body, 4 is an oil pump body, 9 is a crankshaft, 11 and 12 are guide surfaces, 15
is the escape part. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of claim for utility model registration] (1) The shaft of the oil pump incorporated in the bearing support body is engaged with the groove of the crankshaft,
In a refrigerant compressor with an oil pump in which the outer diameter guide surface of the flange of the bearing support body is fitted to the inner diameter guide surface of the crankcase, mounting bolt holes of the bearing support body are provided in the flange portion of the bearing support body. Separately, a refrigerant compressor characterized in that a through screw hole of the same diameter into which a mounting bolt can be screwed is provided, and on the other hand, a relief part is formed by making the tip part of the outer diameter side guide surface smaller in diameter. (2) The refrigerant compressor according to claim 1, wherein two through-screw holes in the flange portion are provided at symmetrical positions with respect to the center of the bearing support body.