WO2006137643A1

WO2006137643A1 - A compressor crankshaft support frame and manufacturing method thereof

Info

Publication number: WO2006137643A1
Application number: PCT/KR2006/001624
Authority: WO
Inventors: Jae In Jo
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-06-23
Filing date: 2006-05-01
Publication date: 2006-12-28
Anticipated expiration: 2007-12-23
Also published as: CN101223361A; KR100676103B1; JP2009503310A; KR20060134581A

Abstract

Provided are a compressor crankshaft support frame and a method of manufacturing the same. The compressor crankshaft support frame includes: a frame body manufactured through pressing, and having a fastening hole formed in a center of the frame body such that an end of a compressor crankshaft is rotatably installed and a plurality of insertion holes spaced apart from a periphery of the fastening hole; a plurality of boss members fitted in the insertion holes of the frame body at its one end by fastening means; and a bearing member insertion-engaged with the periphery of the fastening hole of the frame body. The method includes the steps of: providing a mother plate in a press mold and pressing a frame body having at least one insertion hole at a periphery thereof and a fastening hole at a center thereof; inserting an upper part of a bearing member into the fastening hole of the frame body, and fastening the bearing member to the periphery of the frame body using bolt members; and closely fitting a boss member into the corresponding insertion hole of the frame body, and assembling the frame body and the boss member using a fastening means.

Description

A COMPRESSOR CRANKSHAFT SUPPORT FRAME AND MANUFACTURING METHOD THEREOF

Technical Field

[1] The present invention relates to a crankshaft support frame for a compressor and a method of manufacturing the same, and more particularly, to a compressor crankshaft support frame and a method of manufacturing the same that are capable of manufacturing major components using pressing and assembly processes rather than a casting process to remarkably improve strength and productivity of the frame and drastically reduce the weight of the frame.

[2]

Background Art

[3] Generally, a refrigerator is equipped with a compressor installed in a machine room to compress low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant. The compressor employs a hermetic electromotive compressor.

[4] FIG. 1 illustrates the inner configuration of a conventional hermetic compressor which includes a hermetic housing 1 having upper and lower housings It and Ib, and a crankshaft support frame 2 disposed in the hermetic housing 1.

[5] A stator 3 is fixed to the crankshaft support frame 2 supported in the hermetic housing 1 by springs 2S.

[6] In addition, a crankshaft 5 is rotatably installed through a center hole of the crankshaft support frame 2. A rotor 4 is integrally fixed to the crankshaft 5 to rotate together with the crankshaft 5 by electromagnetic interaction with the stator 3.

[7] An eccentric pin 5b eccentric to a rotational axis of the crankshaft 5 is installed at an upper end of the crankshaft 5. In addition, a balance weight 5c is formed opposite to the eccentric pin 5b.

[8] Further, an oil passageway 5a is formed in the crankshaft 5, and oil L existing on a bottom surface of the hermetic housing 1 is guided through the oil passageway 5a to be transmitted to an upper part of the crankshaft support frame 2 and then scattered.

[9] A pump 5d is installed at a lower end of the crankshaft 5 to pump and then transmit the oil L through the oil passageway 5a.

[10] Meanwhile, a cylinder block 6 having a compression chamber 6¹ therein is integrally formed with the crankshaft support frame 2. A piston 7 installed in the compression chamber 6' is connected to the eccentric pin 5b of the crankshaft 5 by a connecting rod 8. [11] In addition, a valve assembly 9 is installed at an end of the cylinder block 6 to control a flow of refrigerant introduced into and discharged from the compression chamber 6'.

[12] In the above components, the crankshaft support frame 2 is generally fabricated by a casting process. Therefore, more time is required to cool the casting frame and the completed frame should be precisely re-grinded.

[13] Moreover, there is a probability of producing inferior goods depending on an injection amount of melted iron during the casting process. In addition, since a weight of the frame is heavy due to characteristics of the casting process, it may cause waste of materials and a lowering of productivity.

[14]

Disclosure of Invention Technical Problem

[15] In order to solve the foregoing and/or other problems, it is an object of the present invention to provide a compressor crankshaft support frame having an improved structure and a method of manufacturing the same that are capable of conveniently and readily manufacturing major components through pressing and assembly processes rather than a casting process to remarkably improve strength and productivity of the frame and drastically reduce the weight of the frame.

[16]

Technical Solution

[17] In order to achieve the above objects, according to one aspect of the present invention, a compressor crankshaft support frame includes: a frame body manufactured through pressing, and having a fastening hole formed in a center of the frame body such that an end of a compressor crankshaft is rotatably installed and a plurality of insertion holes spaced apart from a periphery of the fastening hole; a plurality of boss members fitted in the insertion holes of the frame body at its one end by fastening means; and a bearing member insertion-engaged with the periphery of the fastening hole of the frame body.

[18] In addition, the fastening means may include an end of the boss member having an outer diameter corresponding to an inner diameter of the insertion hole to be insertion- engaged with each other, and a caulking part formed at the end of the boss member.

[19] Further, the fastening means may be a welded part for integrally fixing the fitted part of the boss member and the insertion hole.

[20] Furthermore, a periphery of the frame body may have a bent part, at least a portion of which is bent downward.

[21] According to another aspect of the present invention, a method of manufacturing a compressor crankshaft support frame includes the steps of: providing a mother plate in a press mold and pressing a frame body having at least one insertion hole at a periphery thereof and a fastening hole at a center thereof; inserting an upper part of a bearing member into the fastening hole of the frame body, and fastening the bearing member to the periphery of the frame body using bolt members; and closely fitting a boss member into the corresponding insertion hole of the frame body, and assembling the frame body and the boss member using a fastening means.

[22]

Advantageous Effects

[23] As can be seen from the foregoing, the compressor crankshaft support frame of the present invention may be manufactured through pressing and assembly, rather than casting. Therefore, the frame body is manufactured by the press mold, the separately manufactured boss member and bearing member is assembled to the frame body, thereby enabling to emit the cooling of the casting and a precise abrasion process after the completion of the casting to remarkably reduce weight and working time thereof.

[24] In addition, it is possible to remarkably improve strength and productivity in comparison with the casting method.

[25]

Brief Description of the Drawings

[26] The above and other aspects and advantages of the present invention will become apparent and more readily appreciated from the following description of exemplary embodiments, taken in conjunction with the accompanying drawings of which:

[27] FIG. 1 is a cross-sectional view of a conventional compressor for a refrigerator;

[28] FIG. 2 is an exploded perspective view of a compressor crankshaft support frame in accordance with the present invention;

[29] FIG. 3 is a perspective view of the compressor crankshaft support frame in accordance with the present invention;

[30] FIG. 4 is a cross-sectional view taken along line A-A'in FIG. 3;

[31] FIG. 5 is a schematic cross-sectional view of an embodiment of a fastening means in accordance with the present invention;

[32] FIG. 6 is a schematic cross-sectional view of another embodiment of a fastening means in accordance with the present invention;

[33] FIG. 7 is a schematic cross-sectional view of still another embodiment of a fastening means in accordance with the present invention;

[34] FIG. 8 is a flowchart illustrating a method of manufacturing a compressor crankshaft support frame in accordance with the present invention; and

[35] FIG. 9 is a diagram schematically illustrating a process of manufacturing a bearing member in accordance with the present invention. [36]

Mode for the Invention

[37] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

[38] Referring to FIGS. 2 to 4, a compressor crankshaft support frame in accordance with the present invention includes a frame body 100 having a fastening hole 110 at its center and at least one insertion hole 120 at its periphery, a bearing member 200 fastened to the fastening hole 110 of the frame body 100 and in which an end of a compressor crankshaft is rotatably installed, and a boss member 300 fitted in the insertion hole 120 of the frame body 100 by a fastening means.

[39] More specifically, the frame body 100 is formed by pressing a mother plate such as a steel plate using upper and lower press molds (not shown) having a symmetrical structure. In addition, the fastening hole 110 and the insertion hole 120 at the center and periphery of the frame body 100 are also punched by pressing.

[40] Meanwhile, a separate punching machine (not shown) may be used to precisely machine the fastening hole 110 and the insertion hole 120 of the frame body 100.

[41] In addition, through-holes 115 are formed around the fastening hole 110 to make bolt members 250 pass through the through-holes 115, thereby fastening the bearing member 200 to the frame body 100.

[42] The bearing member 200 has a center hole 210 through which the compressor crankshaft is rotatably installed, and a flange 220 integrally formed at an upper periphery thereof. The flange 220 has a plurality of fixing holes 222 for fixing the bearing member 200 to the frame body 100.

[43] Each of the fixing holes 222 has a female thread to be engaged with a lower end of the bolt member 250 through the through-hole 115 of the frame body 100 after inserting the bearing member 200 into the fastening hole 110.

[44] In addition, the frame body 100 has a recess 105 depressed around the periphery of the fastening hole 110 at the center thereof to secure attachment of the bearing member 200 and the frame body 100.

[45] Meanwhile, the frame body 100 has bent parts 150 bent downward at both ends thereof to increase structural integrity of the frame body 100.

[46] In addition, as shown in FIG. 5, the fastening means for fixing the boss member 300 to the frame body 100 may be a caulking part that an end of the boss member 300 is inserted into the insertion hole 120 of the frame body 100, or as shown in FIG. 6, may be a welded part that an end of the boss member is welded to the frame body 100. [47] Further, as shown in FIG. 7, the fastening means may be a threaded part that an outer periphery of the boss member 300 and an inner periphery of the insertion hole 120 have male and female threaded parts, respectively.

[48] Referring to FIG. 8 together with FIG. 2, a method of manufacturing a compressor crankshaft support frame in accordance with the present invention includes providing a mother plate in a press mold and pressing a frame body 100 having at least one insertion hole 120 at a periphery thereof and a fastening hole 110 at a center thereof (Sl), bending both ends of the press-formed frame body 100 downward to form bent parts (S2), inserting an upper part of a bearing member 200 into the fastening hole 110 of the frame body 100, fastening the bearing member 200 to the periphery of the frame body 100 using bolt members 250 (S3), and closely fitting a boss member 300 into the corresponding insertion hole 120 of the frame body 100 and then assembling the frame body 100 and the boss member 300 using a fastening means (S4).

[49] At this time, the respective processes may be arbitrarily performed depending on need, other than the above sequential order.

[50] In this process, the press mold employs conventional upper and lower molds, which are symmetrical to each other.

[51] Referring to FIG. 9, the bearing member 200 may be manufactured by a method including machining a cylindrical member to form grooves at upper and lower surfaces thereof and a flange 220 projecting from a periphery thereof, boring the upper and lower grooves to form a center hole 210 connecting the upper and lower grooves, machining the flange 220 to form holes, and tapping the holes to form fixing holes 222 for engaging with the bolt members.

[52] Then, an inner periphery of the bored center hole 210 may be precisely horned to accommodate an end of the crankshaft to be rotated therein. At this time, high-pressure air containing asbestos particles may be blown to precisely abrade the inner periphery of the center hole 210.

[53] Meanwhile, the boss member 300 may be manufactured by a method similar to that of the bearing, except that the tapping is not performed during the flange machining.

[54] As described above, the compressor crankshaft support frame in accordance with the present invention is manufactured by assembling the bearing member 200 and the boss member 300 to the pressed frame body 100. Then, an upper end of the compressor crankshaft is accommodated in the center hole 210 of the bearing member 200, and the boss member 300 fixedly supports the support frame to a compressor frame.

[55] Meanwhile, an eccentric pin and a balance weight are installed at an upper surface of the support frame, and a compression chamber is disposed to compress refrigerant, similar to the conventional art. [56]

Claims

[ 1 ] A compressor crankshaft support frame comprising: a frame body 100 manufactured through pressing, and having a fastening hole

110 formed in a center of the frame body 100 such that an end of a compressor crankshaft is rotatably installed and a plurality of insertion holes 120 spaced apart from a periphery of the fastening hole 110; a plurality of boss members 300 fitted in the insertion holes 120 of the frame body 100 at its one end by fastening means; and a bearing member 200 insertion-engaged with the periphery of the fastening hole

110 of the frame body 100. [2] The compressor crankshaft support frame according to claim 1, wherein the fastening means comprises an end of the boss member 300 having an outer diameter corresponding to an inner diameter of the insertion hole 120 to be insertion-engaged with each other, and a caulking part formed at the end of the boss member 300. [3] The compressor crankshaft support frame according to claim 1, wherein the fastening means is a welded part for integrally fixing the fitted part of the boss member 300 and the insertion hole 120. [4] The compressor crankshaft support frame according to any one of claims 1 to 3, wherein a periphery of the frame body 100 has a bent part 150, at least a portion of which is bent downward. [5] A method of manufacturing a compressor crankshaft support frame, comprising the steps of: providing a mother plate in a press mold and pressing a frame body 100 having at least one insertion hole 120 at a periphery thereof and a fastening hole 110 at a center thereof; inserting an upper part of a bearing member 200 into the fastening hole 110 of the frame body 100, and fastening the bearing member 200 to the periphery of the frame body 100 using bolt members 250; and closely fitting a boss member 300 into the corresponding insertion hole 120 of the frame body 100, and assembling the frame body 100 and the boss member

300 using a fastening means. [6] The method of manufacturing a compressor crankshaft support frame according to claim 5, further comprising the step of bending both ends of the pressed frame body 100 downward.