JP2006348857A - Work positioning fixture for rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work positioning fixture for a rotary compressor having relatively simple construction for improving measuring accuracy and elongating the life while correcting a bearing hole of a bearing frame, if inclined. <P>SOLUTION: An air micro measuring tool 10 has a work cylinder measurement part 12 for measuring a gap between a work cylinder 41 of the rotary compressor and the inner wall of a compression chamber 42 and a bearing frame measurement part 13 for measuring a gap between the bearing hole 46 of the bearing frame 45 and the inner wall. The bearing frame measurement part 13 of the air micro measuring tool 10 is made to be eccentric from the work cylinder measurement part 12 in the direction of aligning the bearing frame 45. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a workpiece positioning jig for a rotary compressor.

  A device for positioning the cylinder block and the bearing that make up the conventional rotary compressor machine part has two openings to be positioned that have a plurality of openings connected to an air micrometer and require relative positioning. A measuring element that supports the object, an arm having a drive source that contacts one of the objects to be positioned with the measuring element, a pair of V blocks that sandwich the other object to be positioned, and a cylinder that drives each of the V blocks. XX 'table on which the pair of V blocks and cylinders are mounted, an elastic body for urging the XX' table in one direction, and the XX 'table can be moved in the XX' direction A YY 'table supported and movably supported in a direction orthogonal to the XX' direction, an elastic body biased in one direction of YY ', an XX' table, and a Y- ′ Includes a position adjusting screw provided on each table, and a fixing cylinder that abuts the XX ′ table and the YY ′ table on the screw, and one of the V blocks on the XX ′ table has its Some have a stopper for limiting the stroke and the driving force of the cylinder for driving the V block without the stopper is weaker than the driving force of the cylinder for driving the V block having the stopper (see, for example, Patent Document 1). .

JP 53-90002 (page 8-9, Fig. 5-7)

In the positioning device of Patent Document 1, the V block that catches the bearing of the rotary compressor is in the Y ′ direction from the line XX ′ only by a clearance that exceeds the tolerance of the center deviation of the inner and outer diameters of the bearing with respect to the center of the main body plate. Since it is supported by the cylinder in a shifted state, a large gap is measured at the tip of the measurement range of the air micrometer, and there is a problem that measurement accuracy is lowered.
Further, when the probe is worn, the clearance with the bearing or the cylinder block is widened, and the probe is out of the measurement range of the air micrometer. Therefore, the probe has to be replaced, which shortens the life of the probe.

Furthermore, since the air micrometer can measure only one location in the vertical direction of the inner diameter of the bearing, if there is an inclination in the inner diameter of the bearing, the deviation amount of the inclination is not reflected in the measurement, resulting in a measurement error. there were.
In addition, since it has a main body plate, two plates, a V block, etc., and the bearing is moved through these, the structure is complicated and positioning work is troublesome, and adjustment errors are likely to occur. There was also a problem.

The present invention has been made in order to solve the above-described problems, and can be used to position a rotary compressor work that is relatively simple in structure, can improve measurement accuracy, and can extend the life of a jig. The purpose is to provide a jig for use.
It is another object of the present invention to provide a workpiece positioning jig for a rotary compressor that can improve accuracy by correcting the inclination even when the bearing hole of the bearing frame is inclined. It is.

  The workpiece positioning jig of the rotary compressor according to the present invention measures the clearance between the work cylinder measuring portion for measuring the clearance between the inner wall of the compression chamber of the work cylinder of the rotary compressor and the inner wall of the bearing hole of the bearing frame. An air micro measuring tool having a bearing frame measuring unit that is eccentric to a direction in which the bearing frame is aligned with respect to the work cylinder measuring unit. .

An air micro measuring tool for a workpiece positioning jig of a rotary compressor according to the present invention comprises a work cylinder measuring unit and a bearing frame measuring unit, and the bearing frame measuring unit is assembled to the work cylinder measuring unit when the bearing frame is assembled. Since it is eccentric in advance in the direction of eccentricity (alignment direction), the measurement range of the air micro measuring tool can be expanded, thereby improving the accuracy and extending the life of the jig.
Moreover, since the bearing hole can be measured at a plurality of points by moving the bearing frame measuring portion in the axial direction, the combination accuracy can be improved even when the bearing hole is inclined.

FIG. 1 is a plan view of a workpiece positioning jig of a rotary compressor according to an embodiment of the present invention, and FIG. 2 is a side view of FIG.
In both figures, reference numeral 1 denotes a workpiece positioning jig, and an air micro measuring tool 10 is fixed to a substantially central portion of the upper surface of the base plate 2, and a central portion which is a positioning target on the base 11. A workpiece 40 comprising a work cylinder 41 having a compression chamber 42 constituting a compression portion and a bearing frame 45 having a bearing hole 46 is fitted. The work cylinder 41 and the bearing frame 45 are integrally coupled by a plurality of bolts 48. The bolt insertion hole 47 provided in the bearing frame 45 is formed to have a slightly larger diameter than the outer diameter of the bolt 48.

  3a and 3b are work fixing portions which are installed on the base plate 2 on both sides of the base 11 and fix the work 40 on the base 11. The clamp cylinder 4 made of, for example, a hydraulic cylinder fixed to the base plate 2, and the clamp The clamp plate 5 is supported on the cylinder 4 so as to be able to rotate and move up and down. When the work 40 is clamped, the work plate 41 is clamped and fixed by rotating and lowering the clamp plate 5 by 90 °.

  Reference numerals 20a and 20b denote a pair of positioning mechanisms provided at 90 ° intervals on the base plate 2 in order to position the bearing frame 45 by finely moving in units of microns. An angle 22 is provided on the spacer 21 fixed to the base plate 2. Further, a linear motion guide 23 is provided, and a linear motion actuator 24 made of, for example, a servo motor and controllable in units of microns is attached to one side (outside) of the angle 22. The actuator of this linear motion actuator 24 is connected to an arm 26 that is slidably supported by the linear motion guide 23 via a floating connector 25 and whose tip is in contact with the bearing frame 45.

  Reference numerals 30a and 30b denote a pair of receiving mechanisms provided on the base plate 2 so as to face the positioning mechanisms 20a and 20b. A cylinder 33 such as a fluid pressure cylinder is provided in the vicinity of the outer end of the spacer 31 fixed to the base plate 2. The floating connector 34 provided on the actuator is connected to an arm 35 that is slidably supported by a linear guide 32 provided on the spacer 31 and whose tip is in contact with the bearing frame 45. Yes.

  Reference numeral 6 denotes a height adjusting actuator which is composed of, for example, a fluid pressure cylinder and is attached to the lower surface of the base plate 2 and adjusts the height position of a later-described bearing frame measuring unit 13 constituting the air micro measuring tool 10.

3 is a longitudinal sectional view of the work and crankshaft assembled in the process after the work 40 is positioned, FIG. 4 is a bottom view of FIG. 3, and FIG. 5 is a plan view of the work cylinder portion of FIG. FIG. 3 shows a state in which the top and bottom of FIG. 2 are reversed.
An eccentric portion 51 eccentric to one side from the center of the crankshaft 50 is provided at the upper portion of the crankshaft 50, and a ring-shaped rolling piston 52 is mounted on the outer periphery of the eccentric portion 51 by shrink fitting or the like. ing.

  In assembling the workpiece 40 and the crankshaft 50, the workpiece cylinder 41 and the bearing frame 45 are integrally fixed with a bolt 48a, and the crankshaft 50 is inserted into the bearing hole 46 of the bearing frame 45 from the compression chamber 42 of the workpiece cylinder 41, The rolling piston 52 is positioned in the compression chamber 42 of the work cylinder 41. Then, the bearing cylinder head 55 is fitted to the crankshaft 50 from above the work cylinder 41 and fixed to the work cylinder 41 with a bolt 48b. Reference numeral 49 denotes a vane whose tip is always in sliding contact with the rolling piston 52.

By the way, when the work 40 and the crankshaft 50 are assembled, the clearance between the inner wall of the compression chamber 42 of the work cylinder 41 and the outer wall of the rolling piston 52 of the crankshaft 50 is set at one place due to the compression performance of the rotary compressor. It is necessary to manage the gap g that is constant only and that is the smallest in the entire circumference.
However, when the work cylinder 41 and the bearing frame 45 are assembled coaxially, due to variations in processing accuracy such as the inner diameter of the both, the outer diameter of the crankshaft 50, the eccentric amount of the rolling piston 52, and the outer diameter of the eccentric portion. In general, the dimension of the gap g is not always kept constant.
In the present invention, the gap g can be managed constantly even in such a case.

FIG. 6 is a cross-sectional view showing an example of a state in which a work is attached to the air micro measuring tool.
The air micro measurement tool 10 includes a base 11 fixed to the base plate 2, a work cylinder measurement unit 12 having a circular cross section provided thereon, and a through hole provided in the vicinity of the center of the base 11 and the work measurement unit 12. The bearing frame measuring unit 13 having a circular cross section that is slidably inserted in the upper and lower sides is formed. The center 13a of the bearing frame measuring unit 13 is finally the bearing frame 45 with respect to the center 12a of the work cylinder measuring unit 12. And is eccentrically provided by S in the direction of eccentricity. The bearing frame measuring unit 13 is driven in the vertical direction by the height adjusting actuator 6 (see FIG. 2). In addition, when it is not necessary to drive the bearing frame measurement unit 13 in the vertical direction, it may be configured integrally with the work cylinder measurement unit 12.

  The base 11 and the work cylinder measuring section 12 are provided with first and second air passages 15 a and 15 b through which air passes. One end of each of the first and second air passages 15 a and 15 b is connected via a joint 16. Are connected to the air pipes 14a and 14b, respectively, and the other ends have openings 17a and 17b at symmetrical positions on the peripheral wall of the work cylinder measurement unit 12 (hereinafter, the openings 17a and 17b are referred to as work cylinder measurement points A and B). ).

  Further, third and fourth air passages 18a and 18b through which air is passed are provided in the axial direction of the bearing frame measuring unit 13, and the third air passage 18a is connected to the first air pipe via the joint 16a. 14a, and the fourth air passage 18b is connected to the second air pipe 14b via the joint 16a. And the upper end part of the 3rd ventilation path 18a is on the opposite side to the work cylinder measurement point A of the upper part of the surrounding wall of the bearing frame measurement part 13, and the 4th ventilation path 18b is on the opposite side to the work cylinder measurement point B. The openings 19a and 19b are respectively provided at symmetrical positions (hereinafter, the openings 19a and 19b are referred to as bearing frame measurement points C and D).

  The workpiece 40 incorporated and positioned in the air micro measuring instrument 10 configured as described above has a bearing frame 45 mounted on the workpiece cylinder 41 and is temporarily tightened by a bolt 48, and the workpiece is measured by the workpiece cylinder measurement unit 12. The compression chamber 42 of the cylinder 41 is fitted, and the bearing hole 46 of the bearing frame 45 is fitted to the bearing frame measuring unit 13. Since the plurality of bolt insertion holes 47 provided in the bearing frame 45 are formed larger than the outer diameter of the bolts 48 fixed to the work cylinder 41 as described above, the bearing frame 45 is within the range of the work cylinder 41. It can move horizontally on top.

  In this way, when the workpiece 40 is assembled into the air micro measuring tool 10, the workpiece cylinder measurement points A and B face the inner wall of the compression chamber 42 of the workpiece cylinder 41, and the bearing frame measurement points C and D correspond to the bearing frame 45. It faces the inner wall of the bearing hole 46.

  Now, when air is supplied from the first and second air pipes 14a and 14b to the air passages 15a, 18a, 15b and 18b, the distance between the work cylinder measurement point A and the inner wall of the compression chamber 42 of the work cylinder 41. Then, the pressure in the first air pipe 14a changes according to the distance between the bearing frame measurement point C and the inner wall of the bearing hole 46 of the bearing frame 45. Similarly, depending on the distance between the work cylinder measurement point B and the inner wall of the compression chamber 42 of the work cylinder 41 and the distance between the bearing frame measurement point D and the inner wall of the bearing hole 46 of the bearing frame 45, Since the pressure in the second air pipe 14b changes, the positions of the work cylinder 41 and the bearing frame 45 can be detected by the mutual pressures of the first and second air pipes 14a and 14b.

Next, the operation of the present invention will be described with reference to the flowchart of FIG.
First, the work cylinder 41 and the bearing frame 45, which are temporarily tightened by the bolts 48, are fitted into the air micro measuring tool 10 provided on the base plate 2 (step S1). Next, the clamp plate 5 of the work fixtures 3a and 3b is rotated by 90 ° and lowered by the clamp cylinder 4 to clamp the work cylinder 41 (step S2). Then, the arms 26 of the positioning mechanisms 20a and 20b and the arms 35 of the receiving mechanisms 30a and 30b are advanced, and the tip portions thereof are brought into contact with the outer periphery of the bearing frame 45 (step S3).

Further, the rolling piston 52 is mounted on the eccentric portion 51 of the crankshaft 50 (step S4), and the amount of eccentricity (the dimension L from the outer wall on the eccentric side to the outer wall on the opposite side of the crankshaft 50—see FIG. 3) is measured. (Step S5).
Finally, when the crankshaft 50 is assembled into the work 40, a gap g between the inner wall of the compression chamber 42 of the work cylinder 41 and the outer wall of the eccentric part of the rolling piston 52 of the crankshaft 50 is determined. The following operation is performed so as to obtain a certain dimension in a certain direction.

  First, a predetermined pressure of air is supplied from the first and second air pipes 14a, 14b to the air passages 15a, 18a, 15b, 18b, and the work cylinder measurement point A and the bearing frame measurement point C are connected to each other. The pressure of the air pipe 14a and the pressure of the second air pipe 14b to which the work cylinder measurement point B and the bearing frame measurement point D are connected are respectively measured, and the eccentric amount of the bearing frame 45 with respect to the work cylinder 41 based on the result. Is calculated (step S6).

  In this case, in order to measure the inclination of the center line 46a of the bearing hole 46 of the bearing frame 45, the bearing frame measuring unit 13 is raised or lowered by the height adjusting actuator 6 as shown in FIG. Thus, for example, the inclination may be calculated based on the amount of displacement at two upper and lower points. FIG. 7 shows a case where a guide 12b is provided in the through hole of the work cylinder measuring unit 12 in order to smoothly move the bearing frame measuring unit 13 up and down.

Next, the bearing frame 45 is moved by the positioning mechanisms 20a and 20b and the receiving mechanisms 30a and 30b so that the pressures at the bearing frame measurement points C and D become predetermined pressures. Is aligned in the direction of eccentricity with respect to the center (step S7) and held in that position.
Then, the work cylinder 41 and the bearing frame 45 are integrally fixed by tightening the bolts 48 (step S8), and the clearance between the inner wall of the bearing hole 46 of the bearing frame 45 and the outer wall of the bearing frame measuring unit 13 is a predetermined dimension. It is reconfirmed whether it is (step S9).

  Next, the arms 26 and 35 of the positioning mechanisms 20a and 20b and the receiving mechanisms 30a and 30b are moved backward (step S10), and the workpiece 40 is unlocked by the workpiece fixtures 3a and 3b (step S11). 40 is removed from the air micro measuring tool 10 (therefore, the workpiece positioning jig 1) (step S12). Although not shown, these operations are performed by an operation panel provided separately.

  As shown in FIG. 3, the crankshaft 50 is inserted into the workpiece 40 thus aligned, the rolling piston 52 is accommodated in the compression chamber 42 of the workpiece cylinder 41, and the bearing cylinder head 55 is attached from above. Then, it is fixed with a bolt 48b. At this time, the gap g between the inner wall of the compression chamber 42 of the workpiece 41 and the outer wall of the maximum eccentric portion of the rolling piston 52 of the crankshaft 50 is positioned to a predetermined dimension.

According to the present invention, by making the bearing frame measurement unit 13 of the air micro measurement tool 10 eccentric in advance in the direction in which the bearing frame 45 is positioned, the measurement range by the air micro measurement tool 10 can be effectively used, Since the movement amount of the bearing frame 45 can be minimized, when the annual production number is, for example, 1 million units, the life of the workpiece positioning jig 1 is doubled from about 1 year to about 2 years. Further, the alignment accuracy at the last stage of the jig (three months before the replacement) can be improved by about 10%.
Further, as shown in FIG. 7, when the bearing frame 45 is positioned, the dimensional error of the gap g is reduced from the conventional 4 μm to 2 minutes by measuring at a plurality of points in consideration of the inclination of the bearing hole 46. 1 can be improved to about 2 μm.

It is a top view of the workpiece | work positioning jig | tool of the rotary compressor which concerns on one embodiment of this invention. It is the side view which showed a part of FIG. 1 in the cross section. It is a longitudinal cross-sectional view which shows the assembly state of a workpiece | work and a crankshaft. FIG. 4 is a bottom view of FIG. 3. It is a top view of the work cylinder part of FIG. It is sectional drawing which shows the state which attached the workpiece | work to the air micro measuring tool. It is sectional drawing which shows the other state which attached the workpiece | work to the air micro measuring tool. It is a flowchart for demonstrating the effect | action of this invention.

Explanation of symbols

1 Work positioning jig, 2 Base plate, 3a, 3b Work fixing part, 6 Height adjustment actuator, 10 Air micro measuring tool, 11 Base, 12 Work cylinder measuring part, 13 Bearing frame measuring part, 14a, 14b First, Second air piping, 15a, 15b First and second air passages, 18a, 18b Third and fourth air passages, 20a, 20b Positioning mechanism, 30a, 30b Receiving mechanism, 40 Work, 41 Work cylinder, 42 Compression chamber, 45 bearing frame, 46 bearing hole, 50 crankshaft, 52 rolling piston.

Claims (4)

A work cylinder measuring unit that measures a gap between the inner wall of the compression chamber of the work cylinder of the rotary compressor and a bearing frame measuring unit that measures a gap between the inner wall of the bearing hole of the bearing frame;
A workpiece positioning jig for a rotary compressor, wherein the bearing frame measuring portion of the air micro measuring tool is eccentric with respect to the work cylinder measuring portion in a direction in which the bearing frame is aligned. A base attached to a base plate, a work cylinder measurement unit provided on the base and fitted with a compression chamber of the work cylinder, and a bearing frame measurement unit provided on the work cylinder measurement unit and fitted with a bearing hole of a bearing frame An air micro measuring instrument comprising:
A workpiece fixing portion provided on the base plate for locking the workpiece cylinder;
A pair of positioning mechanisms provided on the base plate at intervals of 90 ° on the outside of the air micromeasuring device, and an arm that contacts the bearing frame, and has an arm that contacts the bearing frame and moves the bearing frame And a pair of receiving mechanisms provided on the base plate facing the positioning mechanism,
A workpiece positioning jig for a rotary compressor, wherein the center of the bearing frame measuring portion of the air micro measuring tool is decentered in a direction in which the bearing frame is aligned with respect to the center of the workpiece cylinder measuring portion. .   The air micromeasuring tool is connected to the first air pipe and communicates with the first opening of the work cylinder measuring unit and the first provided on the opposite side of the first opening of the bearing frame measuring unit. An air passage that communicates with the second opening, and a third opening that is connected to the second air pipe and is provided at a position symmetrical to the first and second openings in the work cylinder measurement unit and the bearing cylinder measurement unit. A work positioning jig for a rotary compressor according to claim 1 or 2, further comprising an air passage communicating with the fourth opening. The work positioning jig for a rotary compressor according to any one of claims 1 to 3, wherein a bearing frame measuring portion of the air micro measuring tool is configured to be movable in an axial direction.

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