Methods for manufacturing a scroll fluid machine

Abstract

In a scroll compressor (10) which is a scroll fluid machine, an orbiting scroll machining step and a housing machining step are performed as upstream machining steps. In a measurement step, dimensional deviations of an orbiting scroll (50) and a housing (60) machined in the upstream machining steps are measured. In a target setting step, a target value of a dimensional deviation of a fixed scroll (40) is set so that the dimensional deviations of the orbiting scroll (50) and the housing (60) are canceled out. In a fixed scroll machining step which is a downstream machining step, the fixed scroll (40) is machined so that the dimensional deviation of the fixed scroll (40) becomes the target value.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a method for manufacturing a scroll fluid machine.BACKGROUND ART

[0002] Patent Document 1 discloses a scroll fluid machine (scroll compressor). The scroll fluid machine includes a fixed scroll, an orbiting scroll, and a housing. In the scroll compressor, a fixed lap formed in the fixed scroll and an orbiting lap formed in the orbiting scroll mesh with each other to form a fluid chamber (compression chamber). The fixed scroll is fixed to the housing.CITATION LISTPATENT DOCUMENT

[0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2016-079873SUMMARY OF THE INVENTIONTECHNICAL PROBLEM

[0004] In the scroll fluid machine, the fixed scroll, the orbiting scroll, and the housing are combined together. The fixed scroll, the orbiting scroll, and the housing each have a dimensional error (i.e., a difference between an actual dimension and a design value). This causes a gap to be formed between the fixed lap of the fixed scroll and the orbiting lap of the orbiting scroll, and fluid leaks from the fluid chamber through the gap.

[0005] In order to improve the efficiency of the scroll fluid machine by reducing the amount of fluid leakage from the fluid chamber, efforts have been made to improve machining accuracy of the fixed scroll, the orbiting scroll, and the housing. However, in the mass production of the scroll fluid machine, the improvement in the machining accuracy has been limited due to time required for machining the components and the performance of machine tools, and the efficiency of the scroll fluid machine has only been improved to a certain degree.

[0006] An object of the present disclosure is to improve the efficiency of a scroll fluid machine.SOLUTION TO THE PROBLEM

[0007] A first aspect of the present invenion is directed to a method for manufacturing a scroll fluid machine according to claim 1.

[0008] In the first aspect, the upstream machining step, the measurement step, the target setting step, and the downstream machining step are performed in this order. The workpiece is machined in the downstream machining step so that the "dimensional deviation of the workpiece" becomes the "target value set in the target setting step." As a result, part or all of the dimensional deviation of the workpiece machined in the upstream machining step is canceled out by the dimensional deviation of the workpiece machined in the downstream machining step. Therefore, according to this aspect, the variance of the total deviation can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll fluid machine (10).

[0009] A second aspect of the present invention is an embodiment of the first aspect. In the second aspect, the fixed scroll machining step is the downstream machining step, and the fixed lap (42) and positioning structures (44) of the fixed scroll (40) are machined in the fixed scroll machining step so that the dimensional deviation of the fixed scroll (40) becomes the target value set in the target setting step.

[0010] In the second aspect, the dimensional deviation of the fixed scroll (40) machined in the fixed scroll machining step (downstream machining step) becomes a dimensional deviation that cancels out the dimensional deviation of the orbiting scroll (50) machined in the orbiting scroll machining step (upstream machining step). Thus, in the scroll fluid machine (10) manufactured by the manufacturing method of this aspect, part or all of the dimensional deviation of the orbiting scroll (50) is canceled out by the dimensional deviation of the fixed scroll (40).

[0011] A third aspect of the present invention is an embodiment of the first aspect. In the third aspect, the housing machining step is the downstream machining step, and the bearing (64) and positioning structures (67) of the housing (60) are machined in the housing machining step so that the dimensional deviation of the housing (60) becomes the target value set in the target setting step.

[0012] In the third aspect, the dimensional deviation of the housing (60) machined in the housing machining step (downstream machining step) becomes a dimensional deviation that cancels out the dimensional deviation of the orbiting scroll (50) machined in the orbiting scroll machining step (upstream machining step). Thus, in the scroll fluid machine (10) manufactured by the manufacturing method of this aspect, part or all of the dimensional deviation of the orbiting scroll (50) is canceled out by the dimensional deviation of the housing (60).

[0013] A fourth aspect of the present invention is directed to a method for manufacturing a scroll fluid machine according to claim 4.

[0014] In the fourth aspect, the dimensional deviation of the fixed scroll (40) machined in the fixed scroll machining step (downstream machining step) becomes a dimensional deviation that cancels out the dimensional deviation of the orbiting scroll (50) machined in the orbiting scroll machining step (upstream machining step) and the dimensional deviation of the housing (60) machined in the housing machining step (upstream machining step). Thus, in the scroll fluid machine (10) manufactured by the manufacturing method of this aspect, part or all of the dimensional deviations of the orbiting scroll (50) and the housing (60) is canceled out by the dimensional deviation of the fixed scroll (40).

[0015] A fifth aspect of the present invention is directed to a method for manufacturing a scroll fluid machine according to claim 5.

[0016] In the fifth aspect, the dimensional deviation of the housing (60) machined in the housing machining step (downstream machining step) becomes a dimensional deviation that cancels out the dimensional deviation of the orbiting scroll (50) machined in the orbiting scroll machining step (upstream machining step) and the dimensional deviation of the fixed scroll (40) machined in the fixed scroll machining step (upstream machining step). Thus, in the scroll fluid machine (10) manufactured by the manufacturing method of this aspect, part or all of the dimensional deviations of the orbiting scroll (50) and the fixed scroll (40) is canceled out by the dimensional deviation of the housing (60).BRIEF DESCRIPTION OF THE DRAWINGS

[0017] [FIG. 1] FIG. 1 is a vertical cross-sectional view of a scroll compressor according to a first embodiment. [FIG. 2] FIG. 2 is a plan view of an orbiting scroll of the scroll compressor according to the first embodiment. [FIG. 3] FIG. 3 is a cross-sectional view of the orbiting scroll taken along line III-III in FIG. 2. [FIG. 4] FIG. 4 is a bottom view of a fixed scroll of the scroll compressor of the first embodiment. [FIG. 5] FIG. 5 is a cross-sectional view of the fixed scroll taken along line V-V in FIG. 4. [FIG. 6] FIG. 6 is a plan view of a housing of the scroll compressor of the first embodiment. [FIG. 7] FIG. 7 is a cross-sectional view of the fixed scroll taken along line VII-VII in FIG. 6. [FIG. 8] FIG. 8 is an exploded cross-sectional view of a compression mechanism of the scroll compressor according to the first embodiment. [FIG. 9] FIG. 9 is a block diagram illustrating a major part of a method for manufacturing the scroll compressor of the first embodiment. [FIG. 10] FIG. 10 is a graph showing a dimensional deviation of the scroll compressor of the first embodiment in a two-dimensional coordinate system. [FIG. 11] FIG. 11 is a graph showing a dimensional deviation of the orbiting scroll of the scroll compressor of the first embodiment in a two-dimensional coordinate system. [FIG. 12] FIG. 12 is a graph showing a dimensional deviation of the housing of the scroll compressor of the first embodiment in a two-dimensional coordinate system. [FIG. 13] FIG. 13 is a graph showing a dimensional deviation of the fixed scroll of the scroll compressor of the first embodiment in a two-dimensional coordinate system. [FIG. 14] FIG. 14 is a graph showing a distribution of a total deviation of the scroll compressor of the first embodiment in a two-dimensional coordinate system. [FIG. 15] FIG. 15 is a graph showing a dimensional deviation of an orbiting scroll of a scroll compressor of a second embodiment in a two-dimensional coordinate system. [FIG. 16] FIG. 16 is a graph showing a dimensional deviation of an orbiting scroll of a scroll compressor of a third embodiment in a two-dimensional coordinate system. [FIG. 17] FIG. 17 is a graph showing a dimensional deviation of an orbiting scroll of a scroll compressor of a fourth embodiment in a two-dimensional coordinate system. [FIG. 18] FIG. 18 is a graph showing a distribution of a dimensional deviation of the fixed scroll machined when a target value of the dimensional deviation is set to zero in a two-dimensional coordinate system. [FIG. 19] FIG. 19 is a graph showing a dimensional deviation of an orbiting scroll of a conventional scroll compressor in a two-dimensional coordinate system. [FIG. 20] FIG. 20 is a graph showing a distribution of a total deviation of the conventional scroll compressor in a two-dimensional coordinate system. DESCRIPTION OF EMBODIMENTS<<First Embodiment>>

[0018] A scroll compressor (10) of a first embodiment will be described below. The scroll compressor (10) is a scroll fluid machine, and is connected to a refrigerant circuit (not shown) that circulates a refrigerant to perform a refrigeration cycle, thereby compressing the refrigerant which is a fluid.- General Configuration of Scroll Compressor -

[0019] As shown in FIG. 1, the scroll compressor (10) is a hermetic compressor in which a compression mechanism (30) and an electric motor (20) are housed in a casing (11) which is a closed container.

[0020] The casing (11) is a cylindrical pressure vessel having closed ends. The casing (11) is arranged so that its axial direction coincides with a vertical direction. A suction pipe (12) for introducing the refrigerant in the refrigerant circuit into the compression mechanism (30) is provided at an upper end of the casing (11). The casing (11) is further provided with a discharge pipe (13) for discharging the refrigerant in the casing (11) out of the casing (11).

[0021] Inside the casing (11), the electric motor (20) is arranged below the compression mechanism (30). A drive shaft (25) connects the electric motor (20) and the compression mechanism (30). The electric motor (20) includes a stator (21) and a rotor (22). The stator (21) of the electric motor (20) is fixed to the casing (11). The rotor (22) of the electric motor (20) is attached to the drive shaft (25).

[0022] The drive shaft (25) includes a main shaft portion (26) and an eccentric shaft portion (27). A center axis of the main shaft portion (26) coincides with a center axis of the drive shaft (25). The rotor (22) of the electric motor (20) is attached to the main shaft portion (26). Part of the main shaft portion (26) above the rotor (22) is supported by a bearing (64) of a housing (60) which will be described later. The eccentric shaft portion (27) is in the shape of a relatively short shaft, and protrudes from an upper end of the main shaft portion (26). A center axis of the eccentric shaft portion (27) is substantially parallel to that of the main shaft portion (26), and is eccentric with the center axis of the main shaft portion (26).- Configuration of Compression Mechanism -

[0023] The compression mechanism (30) includes an orbiting scroll (50), a fixed scroll (40), a housing (60), and an Oldham coupling (32). In the compression mechanism (30), the orbiting scroll (50) and the fixed scroll (40) form a compression chamber (31) which is a fluid chamber.

[0024] The housing (60) is fixed to the casing (11). The fixed scroll (40) is arranged on an upper surface of the housing (60). The orbiting scroll (50) is arranged between the fixed scroll (40) and the housing (60).

[0025] The Oldham coupling (32) is arranged between the orbiting scroll (50) and the housing (60). The Oldham coupling (32) engages with key grooves (54), which will be described later, of the orbiting scroll (50), and key grooves (63), which will be described later, of the housing (60), and restricts the autorotation of the orbiting scroll (50).<Orbiting Scroll>

[0026] As shown in FIGS. 2 and 3, the orbiting scroll (50) includes an orbiting end plate (51), an orbiting lap (52), and a boss (53).

[0027] The orbiting end plate (51) is formed into a substantially circular flat plate. The orbiting lap (52) is formed in a spiral wall shape that draws an involute curve, and protrudes from a front surface (upper surface in FIG. 3) of the orbiting end plate (51). The boss (53) is formed in a cylindrical shape protruding from a back surface (lower surface in FIG. 3) of the orbiting end plate (51), and is positioned at a center portion of the orbiting end plate (51). The boss (53) constitutes a journal bearing. The eccentric shaft portion (27) of the drive shaft (25) is inserted into the boss (53) (see FIG. 1).

[0028] The orbiting end plate (51) of the orbiting scroll (50) is provided with key grooves (54). The key grooves (54) are recessed grooves that open in the back surface of the orbiting end plate. The key grooves (54) are positioned to face each other with the boss (53) interposed therebetween. A key of the Oldham coupling (32) fits into the key grooves (54).

[0029] A straight line CL OB is a center axis CL OB of the boss (53), and a point CP OB is a point on the center axis CL OB of the boss (53). A point CP OW is the center of the orbiting lap (52), and a straight line CL OW is a center axis CL OW of the orbiting lap (52). The center of the orbiting lap (52) is the center of a base circle of the involute curve defining the shape of the orbiting lap (52). The points CP OB and CP OW are points on a plane orthogonal to the center axis CL OB of the boss (53). The center axis CL OW of the orbiting lap (52) is a straight line that passes the point CP OW , and is parallel to the center axis CL OB of the boss (53).

[0030] A dimensional deviation D O of the orbiting scroll (50) is a deviation of the center axis CL OB of the boss (53) from the center axis CL OW of the orbiting lap (52). The dimensional deviation D O is a vector that starts from the point CP OW and ends at the point CP OB . In FIGS. 2 and 3, the dimensional deviation D O of the orbiting scroll (50) is exaggeratedly illustrated. The magnitude of the dimensional deviation D O of the orbiting scroll (50) is at most about several 10 µm.<Fixed Scroll>

[0031] As shown in FIGS. 4 and 5, the fixed scroll (40) includes a fixed end plate (41), a fixed lap (42), and an outer peripheral wall portion (43).

[0032] The fixed end plate (41) is a relatively thick, flat plate-shaped portion located at an upper portion of the fixed scroll (40). The fixed lap (42) is formed in a spiral wall shape that draws an involute curve, and protrudes from a front surface (lower surface in FIG. 5) of the fixed end plate (41). The outer peripheral wall portion (43) surrounds the outer periphery of the fixed lap (42), and protrudes from the front surface of the fixed end plate (41). An end face (lower end face in FIG. 5) of the outer peripheral wall portion (43) is a substantially flat surface. Further, the end face of the outer peripheral wall portion (43) is substantially flush with an end face (lower end face in FIG. 5) of the fixed lap (42).

[0033] Two positioning holes (44) are formed in the fixed scroll (40). Each positioning hole (44) is a positioning structure that defines a fixed position of the fixed scroll (40) relative to the housing (60).

[0034] Each positioning hole (44) is a hole having a circular cross-section and opens in the end face of the outer peripheral wall portion (43). The positioning holes (44) have the respective center axes that are substantially parallel to each other and substantially orthogonal to the end face of the outer peripheral wall portion (43). Each positioning hole (44) is located near an outer peripheral edge of the outer peripheral wall portion (43). One of the positioning holes (44) is arranged across the fixed lap (42) from the other. The "fitting" of each positioning hole (44) and a positioning pin (35) which will be described later is selected such that the fixed position of the fixed scroll (40) relative to the housing (60) is determined with a desired accuracy.

[0035] A straight line CL FP is a fixed-side center axis CL FP , and a point CP FP is a point on the fixed-side center axis CL FP . The fixed-side center axis CL FP is a straight line that is flush with a plane including center axes CA FP of the two positioning holes (44), and is at an equal distance from the center axes CA FP of the positioning holes (44). The fixed-side center axis CL FP is located at an equal distance, and at the shortest distance, from the center axes CA FP of the positioning holes (44).

[0036] A point CP FW is the center of the fixed lap (42), and a straight line CL FW is a center axis CL FW of the fixed lap (42). The center of the fixed lap (42) is the center of a base circle of the involute curve defining the shape of the fixed lap (42). The points CP FP and CP FW are points on a plane orthogonal to the fixed-side center axis CL FP . The center axis CL FW of the fixed lap (42) is a straight line that passes the point CP FW , and is parallel to the fixed-side center axis CL FP .

[0037] A dimensional deviation D F of the fixed scroll (40) is a deviation of the center axis CL FW of the fixed lap (42) from the fixed-side center axis CL FP . The dimensional deviation D F is a vector that starts from the point CP FP and ends at the point CP FW . In FIGS. 4 and 5, the dimensional deviation D F of the fixed scroll (40) is exaggeratedly illustrated. The magnitude of the dimensional deviation D F of the fixed scroll (40) is at most about several 10 µm.<Housing>

[0038] As shown in FIGS. 6 and 7, the housing (60) includes a main body (61), a bearing (64), and retaining protrusions (66).

[0039] The main body (61) is formed in the shape of a thick disk. A crank chamber (62) is formed in a center portion of the main body (61). The crank chamber (62) is a cylindrical recess that opens in a front surface (upper surface in FIG. 7) of the main body (61). Key grooves (63) are formed in the main body (61). The key grooves (63) are recessed grooves that open in the front surface of the main body (61). The key grooves (63) are positioned to face each other with the crank chamber (62) interposed therebetween. The key of the Oldham coupling (32) fits into the key grooves (63).

[0040] The bearing (64) is formed in a cylindrical shape protruding from a back surface (lower surface in FIG. 7) of the main body (61), and is positioned at a center portion of the main body (61). The bearing (64) constitutes a journal bearing. A bearing metal (65) is arranged inside the bearing (64) (see FIG. 1). The main shaft portion (26) of the drive shaft (25) is inserted into the bearing (64).

[0041] The housing (60) is provided with four retaining protrusions (66). The retaining protrusions (66) protrude from the front surface of the main body (61). Further, each retaining protrusion (66) is formed to curve along an outer peripheral edge of the main body (61). An end face (upper face in FIG. 7) of each retaining protrusion (66) is a substantially flat surface. The end faces of the retaining protrusions (66) are substantially flush with each other.

[0042] Two positioning holes (67) are formed in the housing (60). Each positioning hole (67) is a positioning structure that defines a fixed position of the fixed scroll (40) relative to the housing (60).

[0043] Each positioning hole (67) is a hole having a circular cross-section and opens in the end face of the retaining protrusion (66). The positioning holes (67) have the respective center axes that are substantially parallel to each other and substantially orthogonal to the end faces of the retaining protrusions (66). One of the positioning holes (67) is arranged across the crank chamber (62) from the other. The "fitting" of each positioning hole (67) and a positioning pin (35) which will be described later is selected such that the fixed position of the fixed scroll (40) relative to the housing (60) is determined with a desired accuracy.

[0044] A straight line CL HB is a center axis CL HB of the bearing (64), and a point CP HB is a point on the center axis CL HB of the bearing (64). A straight line CL HP is a housing-side center axis CL HP , and a point CP HP is a point on the housing-side center axis CL HP . The housing-side center axis CL HP is a straight line that is located on a plane including center axes CA HP of the two positioning holes (67), and is at an equal distance from the center axes CA HP of the positioning holes (67). The housing-side center axis CL HP is located at an equal distance, and at the shortest distance, from the center axes CA HP of the positioning holes (67).

[0045] A dimensional deviation D H of the housing (60) is a deviation of the housing-side center axis CL HP from the center axis CL HB of the bearing (64). The dimensional deviation D H is a vector that starts from the point CP HB and ends at the point CP HP . In FIGS. 6 and 7, the dimensional deviation D H of the housing (60) is exaggeratedly illustrated. The magnitude of the dimensional deviation D H of the housing (60) is at most about several 10 µm.<Arrangement of Fixed Scroll, Orbiting Scroll, and Housing>

[0046] As shown in FIG. 8, the fixed scroll (40) is arranged above the housing (60), and the orbiting scroll (50) is arranged between the fixed scroll (40) and the housing (60). Although not shown in FIG. 8, the Oldham coupling (32) is arranged between the orbiting scroll (50) and the housing (60).

[0047] The fixed scroll (40) and the housing (60) are combined together so that each of the positioning pins (35) fits in the positioning holes (44, 67). That is, each of the positioning pins (35) fits in a corresponding pair of the positioning hole (44) of the fixed scroll (40) and the positioning hole (67) of the housing (60) facing each other. Therefore, with the fixed scroll (40) and the housing (60) combined together, the center axis CA FP of each positioning hole (44) of the fixed scroll (40) substantially coincides with the center axis CA HP of the corresponding one of the positioning holes (67) of the housing (60).

[0048] The fixed scroll (40) is fixed to the housing (60) by a plurality of bolts (not shown). When the bolts are tightened, the end face of the outer peripheral wall portion (43) of the fixed scroll (40) comes into close contact with the end faces of the retaining protrusions (66) of the housing (60). The fixed scroll (40) is fixed to the housing (60) so that the fixed-side center axis CL FP substantially coincides with the housing-side center axis CL HP .- Method for Manufacturing Scroll Compressor -

[0049] A method for manufacturing the scroll compressor (10) will be described below. In the method for manufacturing the scroll compressor (10), a step of machining components of the compression mechanism (30), a step of assembling the components of the compression mechanism (30) and connecting the components to the drive shaft (25), and a step of housing the compression mechanism (30) and the electric motor (20) in the casing (11) are performed. It will be described below a major part of the step of machining the components of the compression mechanism (30).

[0050] The step of machining the components of the compression mechanism (30) includes an orbiting scroll machining step, a housing machining step, a fixed scroll machining step, a measurement step, and a target setting step.

[0051] As shown in FIG. 9, in the method for manufacturing the scroll compressor (10) of the present embodiment, the orbiting scroll machining step and the housing machining step are upstream machining steps, and the fixed scroll machining step is a downstream machining step. Further, in the scroll compressor (10) of the present embodiment, the fixed scroll (40) machined in the downstream machining step is a first component, and the orbiting scroll (50) and the housing (60) machined in the upstream machining steps are second components.

[0052] The orbiting scroll machining step and the housing machining step which are the upstream machining steps are performed before the measurement step and the target setting step. The orbiting scroll machining step and the housing machining step which are the upstream machining steps may be performed one after another, or simultaneously in parallel. The fixed scroll machining step which is the downstream machining step is performed after the measurement step and the target setting step.<Orbiting Scroll Machining Step>

[0053] In the orbiting scroll machining step, cutting is performed on the surface of the orbiting lap (52), the front surface of the orbiting end plate (51), an inner peripheral surface of the boss (53), and the surfaces of the key grooves (54) (see FIGS. 2 and 3). Specifically, in the orbiting scroll machining step, the orbiting lap (52) and the boss (53) are machined. In this orbiting scroll machining step, the conditions for machining the orbiting lap (52) and the boss (53) are set to aim at making the center axis CL OW of the orbiting lap (52) coincide with the center axis CL OB of the boss (53) (i.e., setting a target value of the dimensional deviation D O of the orbiting scroll (50) to zero).<Housing Machining Step>

[0054] In the housing machining step, cutting is performed on the end faces of the retaining projections (66), the surface of the peripheral portion of the crank chamber (62), an inner peripheral surface of the bearing (64), and the surfaces of the key grooves (63) (see FIGS. 6 and 7). In the housing machining step, machining is performed to form the positioning holes (67) in the retaining projections (66). Specifically, in the housing machining step, the bearing (64) and the positioning holes (67) are machined. In this housing machining step, the conditions for machining the bearing (64) and the positioning holes (67) are set to aim at making the center axis CL HB of the bearing (64) coincide with the housing-side center axis CL HP (i.e., setting a target value of the dimensional deviation D H of the housing (60) to zero).<Measurement Step>

[0055] In the measurement step, the dimensions of the orbiting scroll (50) machined in the orbiting scroll machining step and the housing (60) machined in the housing machining step are measured. Then, in the measurement step, the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D H of the housing (60) are calculated.

[0056] Specifically, in the measurement step, the position of the center CP OW of the orbiting lap (52) and the position of the point CP OB on the center axis CL OB of the boss (53) are calculated based on the measurement value of the dimension of the orbiting scroll (50) (see FIGS. 2 and 3). As described above, the dimensional deviation D O of the orbiting scroll (50) is a vector that starts from the point CP OW and ends at the point CP OB . In the measurement step, a vector D O , which is the dimensional deviation of the orbiting scroll (50), is specified based on the calculated positions of the points CP OW and CP OB .

[0057] In the measurement step, the position of the point CP HB on the center axis CL HB of the bearing (64) and the position of the point CP HP on the housing-side center axis CL HP are calculated based on the measurement value of the dimension of the housing (60) (see FIGS. 6 and 7). As described above, the dimensional deviation D H of the housing (60) is a vector that starts from the point CP HB and ends at the point CP HP . In the measurement step, a vector D H , which is the dimensional deviation of the housing (60), is specified based on the calculated positions of the points CP HB and CP HP .<Target Setting Step>

[0058] In the target setting step, the target value of the dimensional deviation D F of the fixed scroll (40) machined in the fixed scroll machining step, which is the downstream machining step, is set. In this target setting step, a target vector D F ' = (x F ', y F '), which is the target value of the dimensional deviation D F of the fixed scroll (40), is set so that the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D H of the housing (60) which are calculated in the measurement step are cancelled out. The target setting step will be described below with reference to FIG. 10.

[0059] FIG. 10 shows a two-dimensional coordinate system whose origin point O is the center CP OW of the orbiting lap (52). In the two-dimensional coordinate system, the dimensional deviation of the orbiting scroll (50) obtained in the measurement step is expressed as the vector D O = (x O , y O ), and the dimensional deviation of the housing (60) obtained in the measurement step as the vector D H = (x H , y H ).

[0060] In a virtual state where the center axis CL OB of the boss (53) of the orbiting scroll (50) coincides with the center axis CL HB of the bearing (64) of the housing (60), the point CP OB on the center axis CL OB of the boss (53) coincides with the point CP HB on the center axis CL HB of the bearing (64). Therefore, in the two-dimensional coordinate system of FIG. 10, the dimensional deviation (vector D O ) of the orbiting scroll (50) is a vector that starts from the origin point O and ends at a point A, and the dimensional deviation (vector D H ) of the housing (60) is a vector that starts from the point A and ends at a point B. The point A is the point CP OB on the center axis CL OB of the boss (53), and is also the point CP HB on the center axis CL HB of the bearing (64). The point B is the point CP HP on the housing-side center axis CL HP .

[0061] The positions of the fixed scroll (40) and the housing (60) are relatively set by the positioning pins (35) each of which fits in the positioning holes (44, 67). In the fixed scroll (40), the point CP FP on the fixed-side center axis CL FP is at an equal distance from the center axes CA FP of the positioning holes (44). In the housing (60), the point CP HP on the housing-side center axis CL HP is at an equal distance from the center axes CA HP of the positioning holes (67). Thus, the point CP FP of the fixed scroll (40) coincides with the point CP HP of the housing (60). Therefore, in FIG. 10, a starting point of the vector D F , which is the dimensional deviation of the fixed scroll (40), is the point B.

[0062] An end point of the vector D F , which is the dimensional deviation of the fixed scroll (40), is the center CP FW of the fixed lap (42). Therefore, in order to cancel out the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D H of the housing (60) by the dimensional deviation (vector D F ) of the fixed scroll (40), the end point of the vector D F may be set to the origin point O. Specifically, the vector D F (the dimensional deviation of the fixed scroll (40)) may be set to an inverse vector of the sum of the vector D O (the dimensional deviation of the orbiting scroll (50)) and the vector D H (the dimensional deviation of the housing (60)) (vector D O + vector D H = (x O + x H , y O + y H )). Therefore, in the target setting step, the target vector D F ', which is the target value of the dimensional deviation of the fixed scroll (40), is set to D F ' = (x F ', y F ') = (-(x O + x H ), (y O + y H )).<Fixed Scroll Machining Step>

[0063] In the fixed scroll machining step, cutting is performed on the surface of the fixed lap (42), the front surface of the fixed end plate (41), and the front surface of the outer circumferential wall portion (43) (see FIGS. 4 and 5). In the fixed scroll machining step, machining is performed to form the positioning holes (44) in the outer peripheral wall portion (43). Specifically, in the fixed scroll machining step, the fixed lap (42) and the positioning holes (44) are machined. In this fixed scroll machining step, the fixed lap (42) and the positioning holes (44) are machined under the machining conditions in which the vector D F which is the dimensional deviation of the fixed scroll (40) becomes the target vector D F '.- Dimensional Deviation of Compression Mechanism -

[0064] Regarding the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, it will be described below the dimensional deviations of the orbiting scroll (50), the fixed scroll (40), and the housing (60), and a total deviation that is the sum of the dimensional deviations.<Dimensional Deviation of Orbiting Scroll>

[0065] As described above, in the orbiting scroll machining step, the orbiting lap (52) and the boss (53) are machined under the machining conditions aiming at making the center axis CL OW of the orbiting lap (52) coincide with the center axis CL OB of the boss (53).

[0066] A machining error occurs in the actual orbiting scroll machining step. Thus, the center axis CL OW of the orbiting lap (52) and the center axis CL OB of the boss (53) do not usually coincide with each other. FIG. 11 shows the distribution of the dimensional deviations (vectors D O ) of several tens of orbiting scrolls (50) in a two-dimensional coordinate system. In FIG. 11, the origin point of the two-dimensional coordinate system is the point CP OW (i.e., the starting point of the vector D O ) on the center axis CL OW of the orbiting lap (52). Each point on the two-dimensional coordinate system is a point CP OB (i.e., the end point of the vector D O ) on the center axis CL OB of the boss (53).

[0067] In the two-dimensional coordinate system of FIG. 11, the point CP OB (the end point of the vector D O ) has an x coordinate of x Oi (i = 1, 2, ..., n) and a y coordinate of y Oi (i = 1, 2, ..., n). The x-direction component and y-direction component of the dimensional deviation (vector D O ) of the orbiting scroll (50) have probability distributions which are normal distributions as illustrated in FIG. 11. In the dimensional deviation (vector D O ) of the orbiting scroll (50), the variance of the x-direction components is represented by V Ox , and the variance of the y-direction components is represented by V Oy .

[0068] In the orbiting scroll machining step, the orbiting lap (52) is machined from the front surface of the orbiting end plate (51), and the boss (53) is machined from the back surface of the orbiting end plate (51). Thus, a relatively large machining error occurs in the orbiting scroll machining step. Therefore, in general, the variances V Ox and V Oy of the x- and y-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50) are relatively large.<Dimensional Deviation of Housing>

[0069] As described above, in the housing machining step, the bearing (64) and the positioning holes (67) are machined under the machining conditions aiming at making the center axis CL HB of the bearing (64) coincide with the housing-side center axis CL HP .

[0070] A machining error occurs in the actual housing machining step. Thus, the housing-side center axis CL HP and the center axis CL HB of the bearing (64) do not usually coincide with each other. FIG. 12 shows the distribution of the dimensional deviations (vectors D H ) of several tens of housings (60) in a two-dimensional coordinate system. In FIG. 12, the origin point of the two-dimensional coordinate system is the point CP HB (i.e., the starting point of the vector D H ) on the center axis CL HB of the bearing (64). Each point on the two-dimensional coordinate system is a point CP HP (i.e., the end point of the vector D H ) on the housing-side center axis CL HP .

[0071] In the two-dimensional coordinate system of FIG. 12, the point CP HP (the end point of the vector D H ) has an x coordinate of x Hi (i = 1, 2, ..., n) and a y coordinate of y Hi (i = 1, 2, ..., n). The x-direction component and y-direction component of the dimensional deviation (vector D H ) of the housing (60) have probability distributions which are normal distributions as illustrated in FIG. 12. In the dimensional deviation (vector D H ) of the housing (60), the variance of the x-direction components is represented by V Hx , and the variance of the y-direction components is represented by V Hy .

[0072] The bearing (64) of the housing (60) forms a hole through the main body (61). Therefore, in the housing machining step, with the posture of a workpiece kept fixed, the bearing (64) is measured from the front side of the main body (61) to specify the position of the center axis CL HB , so that the machining position of the positioning hole (67) can be determined based on the specified position of the center axis CL HB . Therefore, the machining error that occurs in the housing machining step is usually smaller than the machining error that occurs in the orbiting scroll machining step. Therefore, in general, the variances V Hx and V Hy of the x- and y-direction components of the dimension deviation (vector D H ) of the housing (60) are respectively smaller than the variances V Ox and V Oy of the dimensional deviation (vector D O ) of the orbiting scroll (50).<Dimensional Deviation of Fixed Scroll>

[0073] As described above, in the fixed scroll machining step, the fixed lap (42) and the positioning holes (44) are machined under the machining conditions aiming at making the dimensional deviation of the fixed scroll (40) coincide with the target vector D F '.

[0074] The target vector D F ' is set so as to cancel out the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D H of the housing (60). Therefore, the target vector D F ' includes the machining error occurred in the orbiting scroll machining step and the machining error occurred in the housing machining step. A machining error occurs also in the fixed scroll machining step. For this reason, the dimensional deviation (vector D F ) of the fixed scroll (40) machined in the fixed scroll machining step usually does not coincide with the target vector D F '.

[0075] FIG. 13 shows the distribution of the dimensional deviations (vectors D F ) of several tens of fixed scrolls (40) machined in the fixed scroll machining step of the present embodiment in a two-dimensional coordinate system. In FIG. 13, the origin point of the two-dimensional coordinate system is the point CP FP (i.e., the starting point of the vector D F ) on the fixed-side center axis CL FP . Each point on the two-dimensional coordinate system is a point CP FW (i.e., the end point of the vector D F ) on the center axis CL FW of the fixed lap (42).

[0076] In the two-dimensional coordinate system in FIG. 13, the point CP FW (the end point of the vector D F ) has an x coordinate of x Fi (i = 1, 2, ..., n) and a y coordinate of y Fi (i = 1, 2, ..., n). The x-direction component and y-direction component of the dimensional deviation (vector D F ) of the fixed scroll (40) have probability distributions which are normal distributions as illustrated in FIG. 13. In the dimensional deviation (vector D F ) of the fixed scroll (40), the variance of the x-direction components is represented by V Fx , and the variance of the y-direction components is represented by V Fy .

[0077] The dimensional deviation (vector D F ) of the fixed scroll (40) machined in the fixed scroll machining step includes the machining error occurred in the orbiting scroll machining step and the machining error occurred in the housing machining step, which are included in the target vector D F ', and the machining error occurred in the fixed scroll machining step.

[0078] Therefore, the variance V Fx of the x-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) includes all the variance V Ox of the x-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50), and the variance V Hx of the x-direction components of the dimension deviation (vector D H ) of the housing (60). More specifically, the variance V Fx is equal to or greater than the sum of the variances V Ox and V Hx (V Fx ≥ V Ox + V Hx ).

[0079] Further, the variance V Fy of the y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) includes all the variance V Oy of the y-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50), and the variance V Hy of the y-direction components of the dimensional deviation (vector D H ) of the housing (60). More specifically, the variance V Fy is equal to or greater than the sum of the variances V Oy and V Hy (V Fy ≥ V Oy + V Hy ).

[0080] In the fixed scroll (40) machined in the fixed scroll machining step of the present embodiment, the variances V Fx and V Fy of the x- and y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) are larger than that of an interval L FP between the two positioning holes (44). The interval L FP between the positioning holes (44) is a distance between the center axes CA FP of the positioning holes (44) (see FIG. 5).<Machining Error that Occurs in Fixed Scroll Machining Step>

[0081] The machining error that occurs in the fixed scroll machining step of the present embodiment will be described below. The machining error that occurs in the fixed scroll machining step of the present embodiment is substantially the same as that occurs in a general fixed scroll machining step.

[0082] In the general fixed scroll machining step, the fixed lap (42) and the positioning holes (44) are machined under the machining conditions aiming at making the fixed-side center axis CL FP coincide with the center axis CL FW of the fixed lap (42) (i.e., rendering the dimensional deviation D F of the fixed scroll (40) zero). FIG. 18 shows the distribution of dimensional deviations (vectors D F ) of several tens of fixed scrolls (40) machined in the general fixed scroll machining step in the two-dimensional coordinate system. The two-dimensional coordinate system of FIG. 18 is the same as that illustrated in FIG. 13.

[0083] In either of the fixed scroll machining step of the present embodiment or the general fixed scroll machining step, both of the fixed lap (42) and the positioning holes (44) are machined from the end face side of the outer peripheral wall portion (43). Thus, the machining error that occurs in the fixed scroll machining step is usually smaller than the machining error that occurs in the orbiting scroll machining step.

[0084] Therefore, when the fixed scroll (40) is machined under the machining conditions aiming at rendering the dimensional deviation D F of the fixed scroll (40) zero, the variances V Fx and V Fy of the x- and y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) are usually respectively smaller than the variances V Ox and V Oy of the dimensional deviation (vector D O ) of the orbiting scroll (50). In this case, the variances V Fx and V Fy of the x- and y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) are respectively smaller than the variances V Hx and V Hy of the dimensional deviation (vector D H ) of the housing (60).<Total Deviation>

[0085] A total deviation D AS , which is the sum of the dimensional deviation (vector D O ) of the orbiting scroll (50), the dimensional deviation (vector D H ) of the housing (60), and the dimensional deviation (vector D F ) of the fixed scroll (40), is the sum of the vectors D O , D H , and D F . An end point of a composite vector D AS , which is the sum of the vectors D O , D H , and D F , is an end point C of the vector D F that starts from the point B (see FIG. 10).

[0086] As shown in FIG. 10, when the dimensional deviation (vector D F ) of the fixed scroll (40) coincides with the target vector D F ', the total deviation is zero (zero vector). However, the machining error also occurs in the fixed scroll machining step which is the downstream machining step. Therefore, in most cases, the dimensional deviation (vector D F ) of the fixed scroll (40) is different from the target vector D F ', and thus, the total deviation will not be zero.

[0087] As described above, the machining error that occurs in the fixed scroll machining step of the present embodiment is substantially the same as that occurs when the fixed scroll (40) is machined under the machining conditions aiming at rendering the dimensional deviation D F of the fixed scroll (40) zero. For this reason, the end point C of the composite vector D AS , which is the sum of the vectors D O , D H , and D F , is located in a region A AS1 shown in FIG. 10.

[0088] In FIG. 10, the region A AS1 is schematically illustrated as a perfect circle region having the origin point O as its center. In practice, however, the region A AS1 is a slightly distorted circular region, and the center of the region A AS1 slightly deviates from the origin point O.

[0089] In the present embodiment, the dimensional deviation (vector D O ) of the orbiting scroll (50) and the dimensional deviation (vector D H ) of the housing (60) are canceled out by the dimensional deviation (vector D F ) of the fixed scroll (40). Therefore, only the machining error occurred in the fixed scroll machining step, which is the downstream machining step, causes the total deviation (vector D AS ) in the present embodiment.

[0090] FIG. 14 shows the distribution of total deviations (vectors D AS ) of several ten sets of the orbiting scroll (50), the fixed scroll (40), and the housing (60) in a two-dimensional coordinate system. In FIG. 14, the origin point of the two-dimensional coordinate system is the point CP OW (i.e., a starting point of the vector D AS ) on the center axis CL OW of the orbiting lap (52). Each point on the two-dimensional coordinate system is a point CP FW (i.e., the end point of the vector D AS ) on the center axis CL FW of the fixed lap (42).

[0091] In the two-dimensional coordinate system of FIG. 14, the point CP FW (the end point of the vector D AS ) has an x coordinate of x ASi (i = 1, 2, ..., n) and a y coordinate of y ASi (i = 1, 2, ..., n). The x-direction component and y-direction component of the total deviation (vector D AS ) have probability distributions which are normal distributions as illustrated in FIG. 14. In the total deviation (vector D AS ), the variance of x-direction components is represented by V ASx , and the variance of y-direction components is represented by V ASy .

[0092] As described above, only the machining error occurred in the fixed scroll machining step, which is the downstream machining step, substantially causes the total deviation (vector D AS ) in the present embodiment. Therefore, the variances V ASx and V ASy of the x- and y-direction components of the total deviation (vector D AS ) shown in FIG. 14 are respectively substantially the same as the variances V Fx and V Fy of the x- and y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) shown in FIG. 18. As described above, FIG. 18 illustrates the distribution of the dimensional deviation (vector D F ) of the fixed scroll (40) when the fixed lap (42) and the positioning holes (44) are machined under the machining conditions aiming at rendering the dimensional deviation D F of the fixed scroll (40) zero.

[0093] However, when measuring the dimensions of the orbiting scroll (50), the fixed scroll (40), and the housing (60) with a measuring instrument, the measurement values of the dimensions include an error of the measuring instrument. Therefore, the variances V ASx and V ASy of the total deviation (vector D AS ) shown in FIG. 14 are not completely the same as the variances V Fx and V Fy of the dimensional deviation (vector D F ) of the fixed scroll (40) shown in FIG. 18.

[0094] As described above, the variance of the dimensional deviation D F of the fixed scroll (40) machined in the fixed scroll machining step of the present embodiment includes all the variance of the dimensional deviation D O of the orbiting scroll (50), and the variance of the dimensional deviation D H of the housing (60). Thus, the variances V ASx and V ASy of the x- and y-direction components of the total deviation (vector D AS ) shown in FIG. 14 are respectively smaller than the variances V Fx and V Fy of the x- and y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) shown in FIG. 13.- Advantages of First Embodiment -

[0095] The method for manufacturing a scroll fluid machine of the present embodiment includes: an orbiting scroll (50) provided with an orbiting lap (52) and a boss (53); a housing (60) provided with a bearing (64) that supports a rotary shaft connected to the boss (53) of the orbiting scroll (50); and a fixed scroll (40) fixed to the housing (60) and provided with a fixed lap (42) that meshes with the orbiting lap (52), each of the fixed scroll (40) and the housing (60) having a plurality of positioning holes (44, 67) for determining a fixed position of the fixed scroll (40) relative to the housing (60).

[0096] The manufacturing method of the present embodiment includes: an orbiting scroll machining step of machining the orbiting lap (52) and boss (53) of the orbiting scroll (50) that is a workpiece; a fixed scroll machining step of machining the fixed lap (42) and positioning holes (44) of the fixed scroll (40) that is a workpiece; and a housing machining step of machining the bearing (64) and positioning holes (67) of the housing (60) that is a workpiece. Further, in the manufacturing method of the present embodiment, the orbiting scroll machining step and the housing machining step are the upstream machining steps, and the fixed scroll machining step is the downstream machining step.

[0097] Further, in the manufacturing method of the present embodiment, a deviation of the center axis CL OB of the boss (53) from the center axis CL OW of the orbiting lap (52) is defined as a dimensional deviation D O of the orbiting scroll (50), a deviation of the housing-side center axis CL HP from the center axis CL HB of the bearing (64) is defined as a dimensional deviation D H of the housing (60), the housing-side center axis CL HP being a straight line at an equal and shortest distance from the positioning holes (67) of the housing (60), a deviation of the center axis CL FW of the fixed lap (42) from the fixed-side center axis CL FP is defined as a dimensional deviation D F of the fixed scroll (40), the fixed-side center axis CL FP being a straight line at an equal and shortest distance from the positioning holes (44) of the fixed scroll (40), and a sum of the dimensional deviation D O of the orbiting scroll (50), the dimensional deviation D H of the housing (60), and the dimensional deviation D F of the fixed scroll (40) is defined as a total deviation.

[0098] In the manufacturing method of the present embodiment, the orbiting scroll machining step and the housing machining step are the upstream machining steps, and the fixed scroll machining step is the downstream machining step. The manufacturing method of the present embodiment further includes: a measurement step of measuring the dimensional deviations of the orbiting scroll (50) and the housing (60) which are machined in the upstream machining steps; and a target setting step of setting a target value of a dimensional deviation of the fixed scroll (40) machined in the downstream machining step so that the dimensional deviations of the orbiting scroll (50) and the housing (60) measured in the measurement step are canceled out by the dimensional deviation of the fixed scroll (40) machined in the downstream machining step, the measurement step and the target setting step being performed after the end of the upstream machining step. The fixed scroll (40) is machined in the downstream machining step so that the dimensional deviation of the fixed scroll (40) becomes the target value set in the target setting step.

[0099] According to a conventional manufacturing method of the scroll compressor (10), the orbiting scroll (50), the fixed scroll (40), and the housing (60) are machined under the machining conditions aiming at rendering the dimensional deviations of these components zero. When many scroll compressors (10) are mass-produced, the dimensional deviations of the orbiting scroll (50), the fixed scroll (40), and the housing (60) of the scroll compressors may or may not cancel out each other.

[0100] FIG. 19 shows the dimensional deviations (vectors D O , D F , and D H ) of the orbiting scroll (50), fixed scroll (40), and housing (60) of the scroll compressor (10) manufactured by the conventional manufacturing method on the same two-dimensional coordinate system as that shown in FIG. 10. An end point C of a composite vector D AS , which is the sum of the vectors D O , D H , and D F , is located in a region A AS5 shown in FIG. 19. FIG. 20 shows a distribution of total deviations (composite vectors D AS ) of the scroll compressors (10) manufactured by the conventional manufacturing method on the same two-dimensional coordinate system as that shown in FIG. 14.

[0101] In the manufacturing method of the present embodiment, the target value of the dimensional deviation D F of the fixed scroll (40) is set in the target setting step, so that the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D H of the housing (60) are canceled out by the dimensional deviation D F of the fixed scroll (40). In the manufacturing method of the present embodiment, the fixed scroll (40) is machined in the fixed scroll machining step, so that the "dimensional deviation (vector D F ) of the fixed scroll (40)" becomes the "target value (target vector D F ') set in the target setting step."

[0102] Thus, as shown in FIG. 10, the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D H of the housing (60) are canceled out by the dimensional deviation D F of the fixed scroll (40). As a result, the size of the region A AS1 where the end point C of the vector D AS (total deviation) may exist can be made greatly smaller than the region A AS5 shown in FIG. 19. As apparent from the comparison between FIGS. 14 and 20, the manufacturing method of the present embodiment can greatly reduce the variances V ASx and V ASy of the x- and y-direction components of the total deviation (vector D AS ) as compared to the conventional method.

[0103] Thus, according to the manufacturing method of the present embodiment, the variance of the total deviation D AS can be reduced while the orbiting scroll (50), the housing (60), and the fixed scroll (40) are machined with the machining accuracy at the same level as before. For this reason, the design values of the dimensions of the orbiting scroll (50), the housing (60), and the fixed scroll (40) can be brought close to the ideal dimension values with no machining error. As a result, a gap between the orbiting lap (52) and the fixed lap (42) in an assembled state can be reduced, and the amount of fluid leaking from the compression chamber (31) through the gap can be reduced. Therefore, according to the present embodiment, the efficiency of the scroll compressor (10) can be improved while an increase in the manufacturing cost of the scroll compressor (10) is reduced.

[0104] In the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, the variance of the dimensional deviation D F of the fixed scroll (40) includes all the variance of the dimensional deviation D O of the orbiting scroll (50) and the variance of the dimensional deviation D H of the housing (60), and the variance of the total deviation D AS is smaller than the variance of the dimensional deviation D F of the fixed scroll (40).

[0105] It has conventionally been impossible to reduce the variance of the total deviation to be smaller than the variance of the dimensional deviation of the fixed scroll (40). However, according to the present embodiment, the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D H of the housing (60) are canceled out by the dimensional deviation D F of the fixed scroll (40), so that the variance of the total deviation D AS can be made smaller than the variance of the dimensional deviation D F of the fixed scroll (40). Thus, according to the present embodiment, the variance of the total deviation D AS can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll compressor (10).

[0106] In addition, in the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, the variance of the dimensional deviation D F of the fixed scroll (40) is made larger than that of the interval L FP between the plurality of positioning holes (44) formed in the fixed scroll (40) so that the variance of the total deviation D AS becomes smaller than the variance of the dimensional deviation D F of the fixed scroll (40).

[0107] Thus, when the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D H of the housing (60) are canceled out by the dimensional deviation D F of the fixed scroll (40), the "variance of the total deviation D AS " can be made smaller than the "variance of the dimensional deviation D F of the fixed scroll (40)." Thus, according to the present embodiment, the variance of the total deviation D AS can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll compressor (10).

[0108] The variances of the dimensional deviations of the orbiting scroll (50), the housing (60), and the fixed scroll (40) can be calculated by measuring the dimensions of the orbiting scrolls (50), the housings (60), and the fixed scrolls (40), approximately 30 pieces each.<<Second Embodiment>>

[0109] A scroll compressor (10) of a second embodiment and a method for manufacturing the same will be described below. The following description will be focused on the differences of the scroll compressor (10) and its manufacturing method of this embodiment from those of the first embodiment.- Method for Manufacturing Scroll Compressor -

[0110] In the manufacturing method of the scroll compressor (10) of the present embodiment, the orbiting scroll machining step and the fixed scroll machining step are the upstream machining steps, and the housing machining step is the downstream machining step. The orbiting scroll machining step and the fixed scroll machining step, which are the upstream machining steps, may be performed one after another, or simultaneously in parallel. Further, in the scroll compressor (10) of the present embodiment, the housing (60) machined in the downstream machining step is a first component, and the orbiting scroll (50) and the fixed scroll (40) machined in the upstream machining steps are second components.<Orbiting Scroll Machining Step>

[0111] The orbiting scroll machining step of the present embodiment is the same as that of the first embodiment. Specifically, in the orbiting scroll machining step of this embodiment, the orbiting lap (52) and the boss (53) are machined under the machining conditions aiming at making the center axis CL OW of the orbiting lap (52) coincide with the center axis CL OB of the boss (53) (i.e., setting the target value of the dimensional deviation D O of the orbiting scroll (50) to zero).<Fixed Scroll Machining Step>

[0112] The fixed scroll machining step of the present embodiment is performed under the machining conditions different from those of the fixed scroll machining step of the first embodiment. In the fixed scroll machining step of the present embodiment, the fixed lap (42) and the positioning holes (44) are machined under the machining conditions aiming at making the fixed-side center axis CL FP coincide with the center axis CL FW of the fixed lap (42) (i.e., setting the dimensional deviation D F of the fixed scroll (40) to zero).<Measurement Step>

[0113] In the measurement step, the dimension of the orbiting scroll (50) machined in the orbiting scroll machining step and the dimension of the fixed scroll (40) machined in the fixed scroll machining step are measured. Then, in the measurement step, the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D F of the fixed scroll (40) are calculated.

[0114] The step of calculating the dimensional deviation D O of the orbiting scroll (50) is the same as that in the first embodiment. Specifically, in the measurement step, the position of the center CP OW of the orbiting lap (52) and the position of the point CP OB on the center axis CL OB of the boss (53) are calculated, and a vector D O , which is the dimensional deviation of the orbiting scroll (50), is specified based on the calculated positions.

[0115] In the measurement step, the position of the center CP FW of the fixed lap (42) and the position of the point CP FP on the fixed-side center axis CL FP are calculated based on the measurement value of the dimension of the fixed scroll (40) (see FIGS. 4 and 5). As described above, the dimensional deviation D F of the fixed scroll (40) is a vector that starts from the point CP FP and ends at the point CP FW . In the measurement step, the vector D F , which is the dimensional deviation of the fixed scroll (40), is specified based on the calculated positions of the points CP FW and CP FP .<Target Setting Step>

[0116] In the target setting step, the target value of the dimensional deviation D H of the housing (60) machined in the housing machining step, which is the downstream machining step, is set. The target setting step of the present embodiment will be described with reference to FIG. 15.

[0117] FIG. 15 is a view corresponding to FIG. 10 related to the first embodiment. FIG. 15 shows a two-dimensional coordinate system whose origin point O is the center CP OW of the orbiting lap (52). In the two-dimensional coordinate system, the dimensional deviation of the orbiting scroll (50) obtained in the measurement step is expressed as a vector D O = (x O , y O ), and the dimensional deviation of the fixed scroll (40) obtained in the measurement step as a vector D F = (x F , y F ).

[0118] In the target setting step of this embodiment, a target vector D H ', which is the target value of the dimensional deviation D H of the housing (60), is set such that the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D F of the fixed scroll (40) which are calculated in the measurement step are cancelled out. Specifically, in the target setting step, the target vector D H ' = (x H ', y H ') is set to an inverse vector of the sum of the vector D O (the dimensional deviation of the orbiting scroll (50)) and the vector D F (the dimensional deviation of the fixed scroll (40)) (vector D O + vector D F = (x O + x F , y O + y F )). That is, the target vector D H ' is represented as D H ' = (x H ', y H ') = (-(x O + x F ), -(y O + y F )).<Housing Machining Step>

[0119] The housing machining step of the present embodiment is performed under the machining conditions different from those of the housing machining step of the first embodiment. In the housing machining step of this embodiment, the bearing (64) and the positioning holes (67) are machined under the machining conditions in which the vector D H which is the dimensional deviation of the housing (60) becomes the target vector D H '.- Dimensional Deviation of Compression Mechanism -

[0120] Regarding the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, it will be described below the dimensional deviations of the orbiting scroll (50), the fixed scroll (40), and the housing (60), and a total deviation that is the sum of the dimensional deviations. Since the orbiting scroll (50) has the same dimensional deviation as that of the first embodiment, the description thereof will be omitted.<Dimensional Deviation of Fixed Scroll>

[0121] In the fixed scroll machining step of the present embodiment, the fixed scroll (40) is machined under the machining conditions aiming at rendering the dimensional deviation D F of the fixed scroll (40) zero. Therefore, the dimensional deviation of the fixed scroll (40) machined in the fixed scroll machining step of the present embodiment is the same as the "dimensional deviation of the fixed scroll (40) machined in the general fixed scroll machining step" described in the first embodiment. Specifically, the variances V Fx and V Fy of the x- and y-direction components of the dimension deviation (vector D F ) of the fixed scroll (40) of the present embodiment are respectively smaller than the variances V Ox and V Oy of the dimensional deviation (vector D O ) of the orbiting scroll (50).<Dimensional Deviation of Housing>

[0122] As described above, in the housing machining step, the bearing (64) and the positioning holes (67) are machined under the machining conditions aiming at making the dimensional deviation of the housing (60) coincide with the target vector D H '.

[0123] The target vector D H ' is set so as to cancel out the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D F of the fixed scroll (40). Therefore, the target vector D H ' includes the machining error occurred in the orbiting scroll machining step and the machining error occurred in the fixed scroll machining step. A machining error occurs also in the housing machining step. For this reason, the dimensional deviation (vector D H ) of the housing (60) machined in the housing machining step usually does not coincide with the target vector D H '.

[0124] The dimensional deviation (vector D H ) of the housing (60) machined in the housing machining step includes the machining error occurred in the orbiting scroll machining step and the machining error occurred in the housing (60) fixed scroll machining step, which are included in the target vector D H ', and the machining error occurred in the fixed scroll machining step.

[0125] Therefore, the variance V Hx of the x-direction components of the dimensional deviation (vector D H ) of the housing (60) includes all the variance V Ox of the x-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50), and the variance V Fx of the x-direction components of the dimension deviation (vector D F ) of the fixed scroll (40). More specifically, the variance V Hx is equal to or greater than the sum of the variances V Ox and V Fx (V Hx ≥ V Ox + V Fx ).

[0126] Further, the variance V Hy of the y-direction components of the dimensional deviation (vector D H ) of the housing (60) includes all the variance V Oy of the y-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50), and the variance V Fy of the y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40). More specifically, the variance V Hy is equal to or greater than the sum of the variances V Oy and V Fy (V Hy ≥ V Oy + V Fy ).

[0127] In the housing (60) machined in the housing machining step of the present embodiment, the variances V Hx and V Hy of the x- and y-direction components of the dimensional deviation (vector D H ) of the housing (60) are larger than that of an interval L HP between the two positioning holes (67). The interval L HP between the positioning holes (67) is a distance between the center axes CA HP of the positioning holes (67) (see FIG. 7).<Total Deviation>

[0128] A total deviation D AS , which is the sum of the dimensional deviation (vector D O ) of the orbiting scroll (50), the dimensional deviation (vector D H ) of the housing (60), and the dimensional deviation (vector D F ) of the fixed scroll (40), is the sum of the vectors D O , D H , and D F . An end point of a composite vector D AS , which is the sum of the vectors D O , D H , and D F , is an end point C of the vector D F that starts from the point B (see FIG. 15).

[0129] As shown in FIG. 15, when the dimensional deviation (vector D H ) of the housing (60) coincides with the target vector D H ', the total deviation is zero (zero vector). However, the machining error also occurs in the housing machining step which is the downstream machining step. Therefore, in most cases, the dimensional deviation (vector D H ) of the housing (60) is different from the target vector D H ', and thus, the total deviation will not be zero.

[0130] The machining error that occurs in the housing machining step of the present embodiment is substantially the same as that occurs when the housing (60) is machined under the machining conditions aiming at rendering the dimensional deviation D H of the housing (60) zero. The end point B of the vector D H , which is dimensional deviation of the housing (60), is located in a region A H in FIG. 15. For this reason, the end point C of the composite vector D AS , which is the sum of the vectors D O , D H , and D F , is located in a region A AS2 shown in FIG. 15.

[0131] In FIG. 15, the region A AS2 is schematically illustrated as a perfect circle region having the origin point O as its center. In practice, however, the region A AS2 is a slightly distorted circular region, and the center of the region A AS2 slightly deviates from the origin point O.

[0132] As described above, the variance of the dimensional deviation D H of the housing (60) machined in the housing machining step of the present embodiment includes all the variance of the dimensional deviation D O of the orbiting scroll (50), and the variance of the dimensional deviation D F of the fixed scroll (40). Thus, the variances V ASx and V ASy of the x- and y-direction components of the total deviation (vector D AS ) are respectively smaller than the variances V Hx and V Hy of the x- and y-direction components of the dimensional deviation (vector D H ) of the housing (60).- Advantages of Second Embodiment -

[0133] In the manufacturing method of the present embodiment, the orbiting scroll machining step and the fixed scroll machining step are the upstream machining steps, and the housing machining step is the downstream machining step. The manufacturing method of the present embodiment further includes: a measurement step of measuring the dimensional deviations of the orbiting scroll (50) and the fixed scroll (40) which are machined in the upstream machining steps; and a target setting step of setting a target value of a dimensional deviation of the housing (60) machined in the downstream machining step so that the dimensional deviations of the orbiting scroll (50) and the fixed scroll (40) measured in the measurement step are canceled out by the dimensional deviation of the housing (60) machined in the downstream machining step, the measurement step and the target setting step being performed after the end of the upstream machining step. In the downstream machining step, the housing (60) is machined so that the dimensional deviation of the housing (60) becomes the target value set in the target setting step.

[0134] According to the manufacturing method of the present embodiment, just like in the manufacturing method of the first embodiment, the variance of the total deviation D AS can be reduced while the orbiting scroll (50), the housing (60), and the fixed scroll (40) are machined with the machining accuracy at the same level as before. Therefore, according to the present embodiment, just like in the first embodiment, the efficiency of the scroll compressor (10) can be improved while an increase in the manufacturing cost of the scroll compressor (10) is reduced.

[0135] In the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, the variance of the dimensional deviation D H of the housing (60) includes all the variance of the dimensional deviation D O of the orbiting scroll (50) and the variance of the dimensional deviation D F of the fixed scroll (40), and the variance of the total deviation D AS is smaller than the variance of the dimensional deviation D H of the housing (60).

[0136] It has conventionally been impossible to reduce the variance of the total deviation to be smaller than the variance of the dimensional deviation of the housing (60). However, according to the present embodiment, the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D F of the fixed scroll (40) are canceled out by the dimensional deviation D H of the housing (60), so that the variance of the total deviation D AS can be made smaller than the variance of the dimensional deviation D H of the housing (60). Thus, according to the present embodiment, the variance of the total deviation D AS can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll compressor (10).

[0137] In addition, in the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, the variance of the dimensional deviation D H of the housing (60) is made larger than that of the interval L HP between the plurality of positioning holes (67) formed in the housing (60) so that the variance of the total deviation D AS becomes smaller than the variance of the dimensional deviation D H of the housing (60).

[0138] Thus, the dimensional deviation D O of the orbiting scroll (50) and the dimensional deviation D F of the fixed scroll (40) are canceled out by the dimensional deviation D H of the housing (60), so that the "variance of the total deviation D AS " can be made smaller than the "variance of the dimensional deviation D H of the housing (60)." Therefore, according to the present embodiment, the variance of the total deviation D AS can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll compressor (10).<<Third Embodiment>>

[0139] A scroll compressor (10) of a third embodiment and a method for manufacturing the same will be described below. The following description will be focused on the differences of the scroll compressor (10) and its manufacturing method of this embodiment from those of the first embodiment.- Method for Manufacturing Scroll Compressor -

[0140] In the manufacturing method of the scroll compressor (10) of the present embodiment, the orbiting scroll machining step is the upstream machining step, and the fixed scroll machining step is the downstream machining step. The housing machining step may be performed at any time as long as it is performed prior to the assembly of the compression mechanism (30). Further, in the scroll compressor (10) of the present embodiment, the fixed scroll (40) machined in the downstream machining step is a first component, and the orbiting scroll (50) machined in the upstream machining step is a second component.<Orbiting Scroll Machining Step>

[0141] The orbiting scroll machining step of the present embodiment is the same as that of the first embodiment. Specifically, in the orbiting scroll machining step of this embodiment, the orbiting lap (52) and the boss (53) are machined under the machining conditions aiming at making the center axis CL OW of the orbiting lap (52) coincide with the center axis CL OB of the boss (53) (i.e., setting the target value of the dimensional deviation D O of the orbiting scroll (50) to zero).<Measurement Step>

[0142] In the measurement step, the dimension of the orbiting scroll (50) machined in the orbiting scroll machining step is measured to calculate the dimensional deviation D O of the orbiting scroll (50).

[0143] The step of calculating the dimensional deviation D O of the orbiting scroll (50) is the same as that in the first embodiment. Specifically, in the measurement step, the position of the center CP OW of the orbiting lap (52) and the position of the point CP OB on the center axis CL OB of the boss (53) are calculated, and a vector D O , which is the dimensional deviation of the orbiting scroll (50), is specified based on the calculated positions.<Target Setting Step>

[0144] In the target setting step, the target value of the dimensional deviation D F of the fixed scroll (40) machined in the fixed scroll machining step, which is the downstream machining step, is set. The target setting step of the present embodiment will be described with reference to FIG. 16.

[0145] FIG. 16 is a view corresponding to FIG. 10 related to the first embodiment. FIG. 16 shows a two-dimensional coordinate system whose origin point O is the center CP OW of the orbiting lap (52). In the two-dimensional coordinate system, the dimensional deviation of the orbiting scroll (50) obtained in the measurement step is expressed as a vector D O = (x O , y O ). Further, in the two-dimensional coordinate system, the dimensional deviation of the housing (60) is expressed as a vector D H = (x H , y H ).

[0146] In the target setting step of this embodiment, a target vector D F ', which is the target value of the dimensional deviation D F of the fixed scroll (40), is set such that the dimensional deviation D O of the orbiting scroll (50) calculated in the measurement step is cancelled out. Specifically, in the target setting step, the target vector D F ' = (x F ', y F ') is set to an inverse vector of the vector D O (the dimensional deviation of the orbiting scroll (50)). That is, the target vector D F ' is represented as D F ' = (x F ', y F ') = (-x O , -y O ).<Fixed Scroll Machining Step>

[0147] In this fixed scroll machining step, just like in the first embodiment, the fixed lap (42) and the positioning holes (44) are machined under the machining conditions in which the vector D F which is the dimensional deviation of the fixed scroll (40) becomes the target vector D F '.<Housing Machining Step>

[0148] The housing machining step of the present embodiment is the same as that of the first embodiment. Specifically, in the housing machining step of this embodiment, the bearing (64) and the positioning holes (67) are machined under the machining conditions aiming at making the center axis CL HB of the bearing (64) coincide with the housing-side center axis CL HP (i.e., setting the target value of the dimensional deviation D H of the housing (60) to zero).- Dimensional Deviation of Compression Mechanism -

[0149] Regarding the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, it will be described below the dimensional deviations of the orbiting scroll (50), the fixed scroll (40), and the housing (60), and a total deviation that is the sum of the dimensional deviations. Since the orbiting scroll (50) and the housing (60) have the same dimensional deviations as those of the first embodiment, the description thereof will be omitted.<Dimensional Deviation of Fixed Scroll>

[0150] As described above, in the fixed scroll machining step, the fixed lap (42) and the positioning holes (44) are machined under the machining conditions aiming at making the dimensional deviation of the fixed scroll (40) coincide with a target vector D F '.

[0151] The target vector D F ' is set so as to cancel out the dimensional deviation D O of the orbiting scroll (50). Therefore, the target vector D F ' includes the machining error occurred in the orbiting scroll machining step. A machining error occurs also in the fixed scroll machining step. For this reason, the dimensional deviation (vector D F ) of the fixed scroll (40) machined in the fixed scroll machining step usually does not coincide with the target vector D F '.

[0152] The dimensional deviation (vector D F ) of the fixed scroll (40) machined in the fixed scroll machining step includes the machining error occurred in the orbiting scroll machining step and the machining error occurred in the fixed scroll machining step, which are included in the target vector D F '.

[0153] Therefore, the variance V Fx of the x-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) includes the variance V Ox of the x-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50). More specifically, the variance V Fx is equal to or greater than the variance V Ox (V Fx ≥ V Ox ).

[0154] Further, the variance V Fy of the y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) includes the variance V Oy of the y-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50). More specifically, the variance V Fy is equal to or greater than the variance V Oy (V Fy ≥ V Oy ).

[0155] In the fixed scroll (40) machined in the fixed scroll machining step of the present embodiment, just like in the first embodiment, the variances V Fx and V Fy of the x- and y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40) are larger than that of an interval L FP between the two positioning holes (44).<Total Deviation>

[0156] A total deviation D AS , which is the sum of the dimensional deviation (vector D O ) of the orbiting scroll (50), the dimensional deviation (vector D H ) of the housing (60), and the dimensional deviation (vector D F ) of the fixed scroll (40), is the sum of the vectors D O , D H , and D F . An end point of a composite vector D AS , which is the sum of the vectors D O , D H , and D F , is an end point C of the vector D F that starts from the point B (see FIG. 16).

[0157] As shown in FIG. 16, when the dimensional deviation (vector D F ) of the fixed scroll (40) coincides with the target vector D F ', the total deviation D AS is equal to the dimensional deviation (vector D H ) of the housing (60). For this reason, when the dimensional deviation (vector D F ) of the fixed scroll (40) coincides with the target vector D F ', the end point C of the composite vector D AS is located in a region A H shown in FIG. 16. The region A H is a region where the end point of a "vector equal to the vector D H (the dimensional deviation of the housing (60)) and starts from the origin point O" may exist. A machining error also occurs in the fixed scroll machining step which is the downstream machining step. This machining error is indicated by a region A F in FIG. 16. Thus, the end point C of the composite vector D AS , which is the sum of the vectors D O , D H , and D F , is located in a region A AS3 (i.e., a region including the regions A H and A F ) shown in FIG. 16.

[0158] In FIG. 16, the region A AS3 is schematically illustrated as a perfect circle region having the origin point O as its center. In practice, however, the region A AS3 is a slightly distorted circular region, and the center of the region A AS3 slightly deviates from the origin point O.

[0159] As described above, the variance of the dimensional deviation D F of the fixed scroll (40) machined in the fixed scroll machining step of the present embodiment includes the variance of the dimensional deviation D O of the orbiting scroll (50). Thus, the variances V ASx and V ASy of the x- and y-direction components of the total deviation (vector D AS ) are respectively smaller than the variances V Fx and V Fy of the x- and y-direction components of the dimensional deviation (vector D F ) of the fixed scroll (40).- Advantages of Third Embodiment -

[0160] In the manufacturing method of the present embodiment, the orbiting scroll machining step is the upstream machining step, and the fixed scroll machining step is the downstream machining step. The manufacturing method of the present embodiment further includes: a measurement step of measuring the dimensional deviation of the orbiting scroll (50) machined in the upstream machining step; and a target setting step of setting a target value of a dimensional deviation of the fixed scroll (40) machined in the downstream machining step so that the dimensional deviation of the orbiting scroll (50) measured in the measurement step is canceled out by the dimensional deviation of the fixed scroll (40) machined in the downstream machining step, the measurement step and the target setting step being performed after the end of the upstream machining step. In the downstream machining step, the fixed scroll (40) is machined so that the dimensional deviation of the fixed scroll (40) becomes the target value set in the target setting step.

[0161] According to the manufacturing method of the present embodiment, just like in the manufacturing method of the first embodiment, the variance of the total deviation D AS can be reduced while the orbiting scroll (50), the housing (60), and the fixed scroll (40) are machined with the machining accuracy at the same level as before. Therefore, according to the present embodiment, just like in the first embodiment, the efficiency of the scroll compressor (10) can be improved while an increase in the manufacturing cost of the scroll compressor (10) is reduced.

[0162] In the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, the variance of the dimensional deviation D F of the fixed scroll (40) includes the variance of the dimensional deviation D O of the orbiting scroll (50), and the variance of the total deviation D AS is smaller than the variance of the dimensional deviation D F of the fixed scroll (40).

[0163] It has conventionally been impossible to reduce the variance of the total deviation to be smaller than the variance of the dimensional deviation of the fixed scroll (40). However, according to the present embodiment, the dimensional deviation D O of the orbiting scroll (50) is canceled out by the dimensional deviation D F of the fixed scroll (40), so that the variance of the total deviation D AS can be made smaller than the variance of the dimensional deviation D F of the fixed scroll (40). Therefore, according to the present embodiment, the variance of the total deviation D AS can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll compressor (10).

[0164] In addition, in the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, the variance of the dimensional deviation D F of the fixed scroll (40) is made larger than that of the interval L FP between the plurality of positioning holes (44) formed in the fixed scroll (40) so that the variance of the total deviation D AS becomes smaller than that of the dimensional deviation D F of the fixed scroll (40).

[0165] Thus, when the dimensional deviation D O of the orbiting scroll (50) is canceled out by the dimensional deviation D F of the fixed scroll (40), the "variance of the total deviation D AS " can be made smaller than the "variance of the dimensional deviation D F of the fixed scroll (40)." Therefore, according to the present embodiment, the variance of the total deviation D AS can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll compressor (10).<<Fourth Embodiment>>

[0166] A scroll compressor (10) of a fourth embodiment and a method for manufacturing the same will be described below. The following description will be focused on the differences of the scroll compressor (10) and its manufacturing method of this embodiment from those of the first embodiment.- Method for Manufacturing Scroll Compressor -

[0167] In the manufacturing method of the scroll compressor (10) of the present embodiment, the orbiting scroll machining step is the upstream machining step, and the housing machining step is the downstream machining step. The fixed scroll machining step may be performed at any time as long as it is performed prior to the assembly of the compression mechanism (30). Further, in the scroll compressor (10) of the present embodiment, the housing (60) machined in the downstream machining step is a first component, and the orbiting scroll (50) machined in the upstream machining step is a second component.<Orbiting Scroll Machining Step>

[0168] The orbiting scroll machining step of the present embodiment is the same as that of the first embodiment. Specifically, in the orbiting scroll machining step of this embodiment, the orbiting lap (52) and the boss (53) are machined under the machining conditions aiming at making the center axis CL OW of the orbiting lap (52) coincide with the center axis CL OB of the boss (53) (i.e., setting the target value of the dimensional deviation D O of the orbiting scroll (50) to zero).<Measurement Step>

[0169] In the measurement step, the dimension of the orbiting scroll (50) machined in the orbiting scroll machining step is measured to calculate the dimensional deviation D O of the orbiting scroll (50).

[0170] The step of calculating the dimensional deviation D O of the orbiting scroll (50) is the same as that in the first embodiment. Specifically, in the measurement step, the position of the center CP OW of the orbiting lap (52) and the position of the point CP OB on the center axis CL OB of the boss (53) are calculated, and a vector D O , which is the dimensional deviation of the orbiting scroll (50), is specified based on the calculated positions.<Target Setting Step>

[0171] In the target setting step, the target value of the dimensional deviation D H of the housing (60) machined in the housing machining step, which is the downstream machining step, is set. The target setting step of the present embodiment will be described with reference to FIG. 17.

[0172] FIG. 17 is a view corresponding to FIG. 10 related to the first embodiment. FIG. 17 shows a two-dimensional coordinate system whose origin point O is the center CP OW of the orbiting lap (52). In the two-dimensional coordinate system, the dimensional deviation of the orbiting scroll (50) obtained in the measurement step is expressed as a vector D O = (x O , y O ). In the two-dimensional coordinate system, the dimensional deviation of the fixed scroll (40) is expressed as a vector D F = (x F , y F ).

[0173] In the target setting step of this embodiment, a target vector D H ', which is the target value of the dimensional deviation D H of the housing (60), is set such that the dimensional deviation D O of the orbiting scroll (50) calculated in the measurement step is cancelled out. Specifically, in the target setting step, the target vector D H ' = (x H ', y H ') is set to an inverse vector of the vector D O (the dimensional deviation of the orbiting scroll (50)). That is, the target vector D H ' is represented as D H ' = (x H ', y H ') = (-x O , -yo).<Housing Machining Step>

[0174] The housing machining step of the present embodiment is performed under the machining conditions different from those of the housing machining step of the first embodiment. In the housing machining step of this embodiment, the bearing (64) and the positioning holes (67) are machined under the machining conditions in which the vector D H which is the dimensional deviation of the housing (60) becomes the target vector D H '.<Fixed Scroll Machining Step>

[0175] The fixed scroll machining step of the present embodiment is the same as the housing machining step of the second embodiment. Specifically, in the fixed scroll machining step of the present embodiment, the fixed lap (42) and the positioning holes (44) are machined under the machining conditions aiming at making the fixed-side center axis CL FP coincide with the center axis CL FW of the fixed lap (42) (i.e., setting the dimensional deviation D F of the fixed scroll (40) to zero).- Dimensional Deviation of Compression Mechanism -

[0176] Regarding the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, it will be described below the dimensional deviations of the orbiting scroll (50), the fixed scroll (40), and the housing (60), and a total deviation that is the sum of the dimensional deviations. Since the orbiting scroll (50) has the same dimensional deviation as that of the first embodiment, the description thereof will be omitted. Further, since the fixed scroll (40) has the same dimensional deviation as that of the second embodiment, the description thereof will be omitted.<Dimensional Deviation of Housing>

[0177] As described above, in the housing machining step, the bearing (64) and the positioning holes (67) is machined under the machining conditions aiming at making the dimensional deviation of the housing (60) coincide with the target vector D H '.

[0178] The target vector D H ' is set so as to cancel out the dimensional deviation D O of the orbiting scroll (50). Therefore, the target vector D H ' includes the machining error occurred in the orbiting scroll machining step. A machining error occurs also in the housing machining step. For this reason, the dimensional deviation (vector D H ) of the housing (60) machined in the housing machining step usually does not coincide with the target vector D H '.

[0179] The dimensional deviation (vector D H ) of the housing (60) machined in the housing machining step includes the machining error occurred in the orbiting scroll machining step and the machining error occurred in the housing machining step, which are included in the target vector D H '.

[0180] Therefore, the variance V Hx of the x-direction components of the dimensional deviation (vector D H ) of the housing (60) includes the variance V Ox of the x-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50). More specifically, the variance V Hx is equal to or greater than the variance V Ox (V Hx ≥ V Ox ).

[0181] The variance V Hy of the y-direction components of the dimensional deviation (vector D H ) of the housing (60) includes the variance V Oy of the y-direction components of the dimensional deviation (vector D O ) of the orbiting scroll (50). More specifically, the variance V Hy is equal to or greater than the variance V Oy (V Hy ≥ V Oy ).

[0182] In the housing (60) machined in the housing machining step of the present embodiment, just like in the second embodiment, the variances V Hx and V Hy of the x- and y-direction components of the dimensional deviation (vector D H ) of the housing (60) are larger than that of an interval L HP between the two positioning holes (67).<Total Deviation>

[0183] A total deviation D AS , which is the sum of the dimensional deviation (vector D O ) of the orbiting scroll (50), the dimensional deviation (vector D H ) of the housing (60), and the dimensional deviation (vector D F ) of the fixed scroll (40), is the sum of the vectors D O , D H , and D F . An end point of a composite vector D AS , which is the sum of the vectors D O , D H , and D F , is an end point C of the vector D F that starts from the point B (see FIG. 17).

[0184] As shown in FIG. 17, when the dimensional deviation (vector D H ) of the housing (60) coincides with the target vector D H ', the total deviation D AS is equal to the dimensional deviation (vector D F ) of the fixed scroll (40). For this reason, when the dimensional deviation (vector D H ) of the housing (60) coincides with the target vector D H ', the end point C of the composite vector D AS is located in a region A F shown in FIG. 17. The region A F is a region where the end point of the vector D F (the dimensional deviation of the fixed scroll (40)) may exist (i.e., a region indicating a machining error that occurs in the fixed scroll machining step). The machining error also occurs in the housing machining step which is the downstream machining step. This machining error is indicated by a region A H in FIG. 17. For this reason, the end point C of the composite vector D AS , which is the sum of the vectors D O , D H , and D F , is located in a region A AS4 (i.e., a region including the regions A H and A F ) shown in FIG. 17.

[0185] In FIG. 17, the region A AS4 is schematically illustrated as a perfect circle region having the origin point O as its center. In practice, however, the region A AS4 is a slightly distorted circular region, and the center of the region A AS4 slightly deviates from the origin point O.

[0186] As described above, the variance of the dimensional deviation D H of the housing (60) machined in the housing machining step of the present embodiment includes the variance of the dimensional deviation D O of the orbiting scroll (50). Thus, the variances V ASX and V ASy of the x- and y-direction components of the total deviation (vector D AS ) are respectively smaller than the variances V Hx and V Hy of the x- and y-direction components of the dimensional deviation (vector D H ) of the housing (60).- Advantages of Fourth Embodiment -

[0187] In the manufacturing method of the present embodiment, the orbiting scroll machining step is the upstream machining step, and the housing machining step is the downstream machining step. The manufacturing method of the present embodiment further includes: a measurement step of measuring the dimensional deviation of the orbiting scroll (50) machined in the upstream machining step; and a target setting step of setting a target value of a dimensional deviation of the housing (60) machined in the downstream machining step so that the dimensional deviation of the orbiting scroll (50) measured in the measurement step is canceled out by the dimensional deviation of the housing (60) machined in the downstream machining step, the measurement step and the target setting step being performed after the end of the upstream machining step. In the downstream machining step, the housing (60) is machined so that the dimensional deviation of the housing (60) becomes the target value set in the target setting step.

[0188] According to the manufacturing method of the present embodiment, just like in the manufacturing method of the first embodiment, the variance of the total deviation D AS can be reduced while the orbiting scroll (50), the housing (60), and the fixed scroll (40) are machined with the machining accuracy at the same level as before. Therefore, according to the present embodiment, just like in the first embodiment, the efficiency of the scroll compressor (10) can be improved while an increase in the manufacturing cost of the scroll compressor (10) is reduced.

[0189] In the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, the variance of the dimensional deviation D H of the housing (60) includes the variance of the dimensional deviation D O of the orbiting scroll (50), and the variance of the total deviation D AS is smaller than that of the dimensional deviation D H of the housing (60).

[0190] It has conventionally been impossible to reduce the variance of the total deviation to be smaller than the variance of the dimensional deviation of the housing (60). However, according to the present embodiment, the dimensional deviation D O of the orbiting scroll (50) is canceled out by the dimensional deviation D H of the housing (60), so that the variance of the total deviation D AS can be made smaller than that of the dimensional deviation D H of the housing (60). Therefore, according to the present embodiment, the variance of the total deviation D AS can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll compressor (10).

[0191] In addition, in the scroll compressor (10) manufactured by the manufacturing method of the present embodiment, the variance of the dimensional deviation D H of the housing (60) is made larger than that of the interval L HP between the plurality of positioning holes (67) formed in the housing (60) so that the variance of the total deviation D AS becomes smaller than that of the dimensional deviation D H of the housing (60).

[0192] Thus, when the dimensional deviation D O of the orbiting scroll (50) is canceled out by the dimensional deviation D H of the housing (60), the "variance of the total deviation D AS " can be made smaller than the "variance of the dimensional deviation D H of the housing (60)." Therefore, according to the present embodiment, the variance of the total deviation D AS can be reduced without making the machining accuracy of the orbiting scroll (50), the housing (60), and the fixed scroll (40) higher than before, and can improve the efficiency of the scroll compressor (10).<<Other Embodiments>>

[0193] In the scroll compressor (10) of each of the above embodiments, three or more positioning holes (44, 67) may be formed in each of the fixed scroll (40) and the housing (60). Also in this case, just like in the scroll compressors (10) of the above embodiments, the positioning pins (35) of the same number as the positioning holes (44) of the fixed scroll (40) (or the positioning holes (67) of the housing (60)) may be provided.

[0194] In the scroll compressor (10) of each of the above-described embodiments, the positioning holes (44, 67) are formed in each of the fixed scroll (40) and the housing (60) as the positioning structure, but the positioning structure is not limited to the positioning holes (44, 67). For example, a positioning protrusion as the positioning structure may be formed in one of the fixed scroll (40) or the housing (60), and a positioning hole as the positioning structure in which the positioning protrusion fits may be formed in the other.INDUSTRIAL APPLICABILITY

[0195] As described above, the present disclosure is useful for a scroll fluid machine and a method for manufacturing the same.DESCRIPTION OF REFERENCE CHARACTERS

[0196] 10Scroll Compressor (Scroll Fluid Machine) 25Drive Shaft (Rotary Shaft) 35Positioning Pin 40Fixed Scroll 42Fixed Lap 44Positioning Hole (Positioning Structure) 50Orbiting Scroll 52Orbiting Lap 53Boss 60Housing 64Bearing 67Positioning Hole (Positioning Structure)

Claims

1. A method for manufacturing a scroll fluid machine including: an orbiting scroll (50) provided with an orbiting lap (52) and a boss (53); a housing (60) provided with a bearing (64) that supports a rotary shaft (25) connected to the boss (53) of the orbiting scroll (50) and a crank chamber (62); and a fixed scroll (40) fixed to the housing (60) and provided with a fixed lap (42) that meshes with the orbiting lap (52), each of the fixed scroll (40) and the housing (60) having positioning structures (44, 67) for determining a fixed position of the fixed scroll (40) relative to the housing (60), the positioning structures being two positioning holes, in the housing (60) one of the positioning holes (67) being arranged across the crank chamber (62) from the other, in the fixed scroll (40) one of the positioning holes (44) being arranged across the fixed lap (42) from the other, the method comprising: an orbiting scroll machining step of machining the orbiting lap (52) and boss (53) of the orbiting scroll (50) that is a workpiece; a fixed scroll machining step of machining the fixed lap (42) and positioning structures (44) of the fixed scroll (40) that is a workpiece; and a housing machining step of machining the bearing (64) and positioning structures (67) of the housing (60) that is a workpiece, wherein when a deviation of a center axis of the boss (53) from a center axis of the orbiting lap (52) is defined as a dimensional deviation of the orbiting scroll (50), wherein the dimensional deviation of the orbiting scroll is measured as the vector (DO) having the start and end points obtained respectively by intersecting the center axis of the boss and the center axis of the orbiting lap with one plane orthogonal to both axes, a deviation of a housing-side center axis from a center axis of the bearing (64) is defined as a dimensional deviation of the housing (60), the housing-side center axis CLHP being a straight line that is located on a plane including center axes CAHP of the two positioning holes (67), and is at an equal distance from the center axes CAHP of the positioning holes (67), wherein the dimensional deviation of the housing is measured as the vector (DH) having the start and end points obtained respectively by intersecting the housing-side center axis and the center axis of the bearing with one plane orthogonal to both axes, a deviation of a center axis of the fixed lap (42) from a fixed-side center axis is defined as a dimensional deviation of the fixed scroll (40), the fixed-side center axis being a straight line CLFP that is located on a plane including center axes CAFP of the two positioning holes (44), and is at an equal distance from the center axes CAFP of the positioning holes (44), wherein the dimensional deviation of the fixed scroll is measured as the vector (DF) having the start and end points obtained respectively by intersecting the fixed-side center axis and the center axis of the fixed lap with one plane orthogonal to both axes, and the fixed scroll machining step or the housing machining step is defined as a downstream machining step, and the orbiting scroll machining step is defined as an upstream machining step performed before the downstream machining step, the method further comprises: a measurement step of measuring a dimensional deviation of the orbiting scroll (50) machined in the upstream machining step; and a target setting step of setting a target value of a dimensional deviation of the workpiece machined in the downstream machining step to an inverse vector of the vector (DO) indicating the dimensional deviation of the orbiting scroll (50), and the workpiece is machined in the downstream machining step so that the dimensional deviation of the workpiece becomes the target value set in the target setting step.

2. The method of claim 1, wherein the fixed scroll machining step is the downstream machining step, and the fixed lap (42) and positioning structures (44) of the fixed scroll (40) are machined in the fixed scroll machining step so that the dimensional deviation of the fixed scroll (40) becomes the target value set in the target setting step.

3. The method of claim 1, wherein the housing machining step is the downstream machining step, and the bearing (64) and positioning structures (67) of the housing (60) are machined in the housing machining step so that the dimensional deviation of the housing (60) becomes the target value set in the target setting step.

4. A method for manufacturing a scroll fluid machine including: an orbiting scroll (50) provided with an orbiting lap (52) and a boss (53); a housing (60) provided with a bearing (64) that supports a rotary shaft (25) connected to the boss (53) of the orbiting scroll (50) and a crank chamber (62); and a fixed scroll (40) fixed to the housing (60) and provided with a fixed lap (42) that meshes with the orbiting lap (52), each of the fixed scroll (40) and the housing (60) having positioning structures (44, 67) for determining a fixed position of the fixed scroll (40) relative to the housing (60), the positioning structures being two positioning holes in the housing (60), one of the positioning holes (67) being arranged across the crank chamber (62) from the other, in the fixed scroll (40) one of the positioning holes (44) being arranged across the fixed lap (42) from the other, the method comprising: an orbiting scroll machining step of machining the orbiting lap (52) and boss (53) of the orbiting scroll (50) that is a workpiece; a fixed scroll machining step of machining the fixed lap (42) and positioning structures (44) of the fixed scroll (40) that is a workpiece; and a housing machining step of machining the bearing (64) and positioning structures (67) of the housing (60) that is a workpiece, wherein when a deviation of a center axis of the boss (53) from a center axis of the orbiting lap (52) is defined as a dimensional deviation of the orbiting scroll (50), wherein the dimensional deviation of the orbiting scroll is measured as the vector (DO) having the start and end points obtained respectively by intersecting the center axis of the boss and the center axis of the orbiting lap with one plane orthogonal to both axes, a deviation of a housing-side center axis from a center axis of the bearing (64) is defined as a dimensional deviation of the housing (60), the housing-side center axis being a straight line that is located on a plane including center axes CAHP of the two positioning holes (67), and is at an equal distance from the center axes CAHP of the positioning holes (67), wherein the dimensional deviation of the housing is measured as the vector (DH) having the start and end points obtained respectively by intersecting the housing-side center axis and the center axis of the bearing with one plane orthogonal to both axes, a deviation of a center axis of the fixed lap (42) from a fixed-side center axis is defined as a dimensional deviation of the fixed scroll (40), the fixed-side center axis being a straight line CLFP that is located on a plane including center axes CAFP of the two positioning holes (44), and is at an equal distance from the center axes CAFP of the positioning holes (44), wherein the dimensional deviation of the fixed scroll is measured as the vector (DF) having the start and end points obtained respectively by intersecting the fixed-side center axis and the center axis of the fixed lap with one plane orthogonal to both axes, and the fixed scroll machining step is defined as a downstream machining step, and the orbiting scroll machining step and the housing machining step are defined as an upstream machining step performed before the downstream machining step) the method further comprises: a measurement step of measuring a dimensional deviation of the orbiting scroll (50) machined in the orbiting scroll machining step and a dimensional deviation of the housing (60) machined in the housing machining step; and a target setting step of setting a target value of a dimensional deviation of the fixed scroll (40) machined in the downstream machining step to an inverse vector of the sum of the vector (DO) indicating the dimensional deviation of the orbiting scroll (50) and the vector (DH) indicating a dimensional deviation of the housing (60, and the fixed lap (42) and positioning structures (44) of the fixed scroll (40) are machined in the fixed scroll machining step defined as a downstream machining step so that the dimensional deviation of the fixed scroll (40) becomes the target value set in the target setting step.

5. A method for manufacturing a scroll fluid machine including: an orbiting scroll (50) provided with an orbiting lap (52) and a boss (53); a housing (60) provided with a bearing (64) that supports a rotary shaft (25) connected to the boss (53) of the orbiting scroll (50) and a crank chamber (62); and a fixed scroll (40) fixed to the housing (60) and provided with a fixed lap (42) that meshes with the orbiting lap (52), each of the fixed scroll (40) and the housing (60) having a plurality of positioning structures (44, 67) for determining a fixed position of the fixed scroll (40) relative to the housing (60), the method comprising: an orbiting scroll machining step of machining the orbiting lap (52) and boss (53) of the orbiting scroll (50) that is a workpiece; a fixed scroll machining step of machining the fixed lap (42) and positioning structures (44) of the fixed scroll (40) that is a workpiece; and a housing machining step of machining the bearing (64) and positioning structures (67) of the housing (60) that is a workpiece, wherein when a deviation of a center axis of the boss (53) from a center axis of the orbiting lap (52) is defined as a dimensional deviation of the orbiting scroll (50), wherein the dimensional deviation of the orbiting scroll is measured as the vector (DO) having the start and end points obtained respectively by intersecting the center axis of the boss and the center axis of the orbiting lap with one plane orthogonal to both axes, a deviation of a housing-side center axis from a center axis of the bearing (64) is defined as a dimensional deviation of the housing (60), the housing-side center axis being a straight line that is located on a plane including center axes CAHP of the two positioning holes (67), and is at an equal distance from the center axes CAHP of the positioning holes (67), wherein the dimensional deviation of the housing is measured as the vector (DH) having the start and end points obtained respectively by intersecting the housing-side center axis and the center axis of the bearing with one plane orthogonal to both axes, a deviation of a center axis of the fixed lap (42) from a fixed-side center axis is defined as a dimensional deviation of the fixed scroll (40), the fixed-side center axis being a straight line CLFP that is located on a plane including center axes CAFP of the two positioning holes (44), and is at an equal distance from the center axes CAFP of the positioning holes (44), wherein the dimensional deviation of the fixed scroll is measured as the vector (DF) having the start and end points obtained respectively by intersecting the fixed-side center axis and the center axis of the fixed lap with one plane orthogonal to both axes, and the housing machining step is defined as a downstream machining step, and the orbiting scroll machining step and the fixed scroll machining step are defined as an upstream machining step performed before the downstream machining step, the method further comprises: a measurement step of measuring a dimensional deviation of the orbiting scroll (50) machined in the orbiting scroll machining step and a dimensional deviation of the fixed scroll (40) machined in the fixed scroll machining step; and a target setting step of setting a target value of a dimensional deviation of the housing (60) machined in the downstream machining step to an inverse vector of the sum of the vector (DO) indicating the dimensional deviation of the orbiting scroll (50) and the vector (DF) indicating dimensional deviation of the fixed scroll (40), and the bearing (64) and positioning structures (67) of the housing (60) are machined in the housing machining step defined as a downstream machining step so that the dimensional deviation of the housing (60) becomes the target value set in the target setting step.

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