JP2012062875A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor preventing deformation of a cylinder bore due to a dimensional error of a mounting leg portion, etc. and securing rigidity of the mounting leg portion.SOLUTION: This compressor 1 includes a housing 8 constituted by combining at least a front side housing 2 with a rear side housing 3. The mounting leg portion 31 provided in the housing 8 is installed by being fastened with a bolt at a mounting portion. The mounting leg portion 31 is provided in each of the front side housing 2 and the rear side housing 3, and a pair of mounting leg portions 31 are provided in a vertical direction of the compressor in at least one of the front side housing 2 and the rear side housing 3. In the mounting leg portion 31, a bolt insertion hole 32 inserted with the bolt therein is formed, and a flat surface 33 formed perpendicularly to an inserting direction of the bolt is provided at the projected distal end portion. In the flat surface 33, a width of the flat surface 33 along the vertical direction of the compressor 1 is formed to be smaller than a width of the vertical direction of a projecting portion 31b and smaller than a width of the flat surface 33 along a longitudinal direction of the compressor 1.

Description

  The present invention relates to a compressor in which a mounting foot portion provided in a housing is installed at a predetermined position using a mounting bolt or the like.

  A compressor for an air conditioner mounted on a vehicle includes a cylinder block in which a plurality of cylinder bores are formed, a shaft that is rotatably provided to penetrate the cylinder block, and a reciprocating motion in the cylinder bore as the shaft rotates. And a plurality of mounting feet formed on the outer peripheral surface of the cylinder block or the like, using bolts or the like, and fixed to a predetermined mounting member such as an engine.

  As this type of mounting foot, for example, a mounting foot having a cylindrical tip is integrally formed on the outer periphery of the main body of the compressor, and the cylindrical tip is formed in a direction perpendicular to the axial direction of the compressor main body. A configuration is adopted in which a bolt insertion hole is provided and the mounting foot is fixed to the mounting bracket by fastening a mounting bolt inserted through the bolt insertion hole into a mounting bracket fixed to a mounting seat on the outer periphery of the engine (Patent Document 1). reference).

By the way, although the joint surface of the mounting foot and the joint surface of the mounting member on the engine side are uniformly contacted and can be fastened, each of these members has a predetermined dimensional error during the manufacturing process. May occur.
When such a dimensional error occurs, a part of the joint surface of the mounting foot is in contact with the mounting member at a distance from the joint surface, or is contacted only at the corner (edge) of the joint surface of the mounting foot. The bolt will be tightened in the absence. If the bolt is tightened in such a state, the joint surface of the mounting foot is forcibly brought into close contact with the mounting member on the engine side by the tightening load of the bolt, so that the mounting foot is distorted. Furthermore, if the stress generated at this time is propagated to the cylinder bore, for example, if it is a piston-type compressor, the roundness is deteriorated, and the piston touches the cylinder or is pressed against it to cause seizure. There is an inconvenience.

  Therefore, in order to prevent such deformation of the cylinder bore, the dimensional error of the mounting surface is absorbed by reducing the rigidity of a part of the mounting foot, and stress is concentrated on the mounting foot to propagate the pressure to the cylinder bore. It is considered to reduce. For example, in the reciprocating compressor shown in Patent Document 2, a mounting leg portion is connected to a connecting portion extending from a cylinder block, and a protrusion formed following the connecting portion and protruding on one side or both sides in the tightening direction. It is conceived that the protrusions have a lower rigidity than the connecting parts (see Patent Document 2).

Japanese Utility Model Publication No. 2-43478 WO2004 / 074683

However, in the reciprocating compressor described in Patent Document 2, since the protrusions of the attachment feet are made to have low rigidity, the resonance point in the attached state is lowered, and resonance occurs in a lower engine rotation range. It may become a cause of noise problems in the vehicle.
Further, in order to prevent the resonance point of the reciprocating compression machine from being lowered, it is necessary to ensure a predetermined rigidity or higher in the mounting foot, but if tightening while maintaining the rigidity of the mounting foot high, As described above, the cylinder bore cannot be deformed because it is impossible to absorb the dimensional error of the mounting foot or the like.

  The present invention has been made in view of the above-described problems, and it is a main object of the present invention to provide a compressor that prevents deformation of a cylinder bore due to a dimensional error of a mounting foot or the like and ensures rigidity of the mounting foot. And

  A compressor according to the present invention includes a housing configured by assembling at least a front housing and a rear housing, a shaft rotatably supported by the housing and rotated by an external driving force, and a rotational movement of the shaft. And a compression mechanism that converts the compression foot into the compression action of the working fluid, and the installation foot portion is installed by tightening the attachment foot portion provided on the housing to the attachment portion with a bolt. A rear housing is provided separately, and at least one of the front housing and the rear housing is provided in a pair in the vertical direction of the compressor, and an insertion hole through which the bolt is inserted is provided in the mounting foot. Forming and projecting in the insertion direction of the bolt, and in the insertion direction of the bolt at the projected tip In addition, a protrusion having a flat surface formed vertically is provided, and the flat surface is formed such that the width of the flat surface along the vertical direction of the compressor is smaller than the vertical width of the protrusion. It is characterized by being formed smaller than the width of the flat surface along the front-rear direction of the compressor.

As a result, even if there is an error in the relative positional accuracy of the upper and lower mounting feet, the vertical width of the mounting feet is configured to be narrowed, so compression in one mounting foot is possible. The restraining force around the axle is suppressed, and the compressor can be securely fixed by the pair of upper and lower mounting feet while suppressing distortion of the mounting feet. In addition, when there is an error in the relative position accuracy of the front and rear mounting feet, each mounting foot is provided separately in a separate housing, so the error is absorbed by the joint between the housings. Even if the width in the front-rear direction of the flat surface is relatively larger than the width in the up-down direction, the compressor is securely fixed by the front and rear mounting feet while suppressing distortion of the mounting feet. Is possible.
Moreover, since it becomes possible to absorb a dimensional error, without making a part of attachment foot part low rigidity, it becomes possible to ensure the rigidity of an attachment foot part and to obtain a firm fixed state.

Moreover, it is preferable that the ridgeline of the corner | angular part of the said flat surface covers the said insertion hole.
Since the corner ridge line of the flat surface covers the insertion hole, the corner ridge line is shortened, and even if the mounting foot is deformed until the entire flat surface contacts, the absolute amount of deformation is reduced (deformation) Therefore, the bolt tightening load can be effectively concentrated on fixing the compressor, and the compressor can be securely fixed without distorting the cylinder bore.

Furthermore, the protrusion includes a tapered surface that is connected to the flat surface at a predetermined obtuse angle and is parallel to the shaft, and the tapered surface has a circumference around the shaft of the flat surface. It is preferable to be provided on both sides in the direction.
By having such a tapered surface in the protruding portion, the vertical width of the flat surface can be made smaller than that of the protruding portion without reducing the rigidity of the protruding portion, and both high rigidity and low distortion can be achieved.

  Furthermore, the mounting foot may be provided at a position that is substantially symmetric with respect to the axis of the shaft on the outer peripheral surface of the cylinder block, and may be provided at an end in the axial direction of the shaft.

  Since the compressor is fixed at a predetermined position by the three mounting feet, a geometrical surface absorbing structure by three-point support is configured, so that a more stable fixing structure can be obtained.

As described above, according to the present invention, the mounting foot is formed with the insertion hole for inserting the bolt, and protrudes in the insertion direction of the bolt, and the protruding tip is perpendicular to the insertion direction of the bolt. Protruding portions having a formed flat surface are provided, and the flat surface is formed such that the width of the flat surface along the vertical direction of the compressor is smaller than the vertical width of the protruding portion, and the front and rear of the compressor. Since it is formed smaller than the width of the flat surface along the direction, it becomes possible to prevent deformation by minimizing the propagation of stress to the cylinder bore.
Further, the mounting feet are provided separately for the front side housing and the rear side housing, and a pair of mounting feet are provided in at least one of the front side housing and the rear side housing in the vertical direction of the compressor. Even if there is an error in the relative position accuracy of the mounting foot, the vertical width of the mounting foot is narrowed. The force can be suppressed, and the compressor can be securely fixed by the pair of upper and lower mounting feet while suppressing distortion of the mounting feet. In addition, when there is an error in the relative position accuracy of the front and rear mounting feet, each mounting foot is provided separately in a separate housing, so the error is absorbed by the joint between the housings. Even if the width in the front-rear direction of the flat surface is relatively larger than the width in the up-down direction, the compressor is securely fixed by the front and rear mounting feet while suppressing distortion of the mounting feet. Is possible.
Furthermore, since it becomes possible to absorb a dimensional error, without making a part of attachment leg part low rigidity, it becomes possible to ensure the rigidity of an attachment leg part.

FIG. 1 is a side view showing the outer shape of the compressor according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a compressor according to the present invention, and shows a case where the compressor is cut along the line XX in FIG. 3 is a view showing a rear side cylinder block of the compressor shown in FIG. 1, (a) is a side view, and (b) is a view showing an end face viewed from the rear side cylinder head side. FIGS. 4A and 4B are diagrams illustrating a configuration example of the mounting foot, in which FIG. 4A is an enlarged view of the mounting foot, and FIG. 4B is a side view of the mounting foot. FIG. 5 is a diagram showing the mounting state of the mounting foot portion in which the diameter of the bolt insertion hole and the width of the flat surface are different, and (a) shows that the width of the flat surface is larger than the diameter of the bolt insertion hole. A large attachment foot part is shown, (b) shows the attachment foot part whose width of a flat surface is smaller than the diameter of a bolt penetration hole. FIG. 6 is a side view illustrating the outer shape of the compressor according to the second embodiment of the present invention. FIG. 7 is a perspective view of each compressor in the experimental example. FIG. 7A is a perspective view of a conventional compressor in which the mounting foot portion is not processed, and FIG. 7B is a perspective view of the mounting foot portion. The perspective view of the conventional compressor which weakened rigidity is shown, (c) The perspective view of the compressor of this invention is shown.

  Hereinafter, an embodiment in which the compressor of the present invention is a reciprocating compressor will be described with reference to the drawings.

  A reciprocating compressor 1 according to an embodiment of the present invention is used in a refrigeration cycle using a refrigerant as a working fluid in FIGS. 1 to 3, and includes a front side cylinder block (front side housing) 2 and the front side cylinder block. A rear cylinder block (rear housing) 3 assembled to the side cylinder block 2 and a front cylinder assembled to the front side (left side in FIGS. 1 and 2) of the front cylinder block 2 via the valve plate 4 A head 5 and a rear cylinder head 7 assembled via a valve plate 6 on the rear side (right side in FIGS. 1 and 2) of the rear cylinder block 3 are configured. Side cylinder head 5, front side cylinder block 2, rear side cylinder block 3, and rear side cylinder head Constitutes fastened axially, the compressor entire housing 8 by fastening bolts (not shown).

  Each of the front side cylinder block 2 and the rear side cylinder block 3 has a shaft support hole 10 that rotatably supports a shaft 9 described later, and is parallel to the shaft support hole 10 and centered on the shaft 9. A plurality of (five) cylinder bores 11 arranged at equal intervals on the circumference of the cylinder, two discharge passages 12 provided in parallel to the cylinder bores 11, and a suction passage 13 through which a low-pressure working fluid flows are formed. Has been. Each discharge passage 12 communicates with the discharge chamber 14 formed in the front cylinder head 5 and a discharge chamber 14 formed in the rear cylinder head 7, which will be described later, and communicates with each other via the guide path 12 a. . Further, one discharge passage 12 is connected to a discharge port 16 that discharges the working fluid to an external cycle through a through hole 15 formed in the valve plate 6 or the like. The suction passage 13 is connected to a swash plate accommodation chamber 21 described below, and is connected to a low pressure passage 18 communicating with the suction chamber 17 of each cylinder head 5, 7 via the swash plate accommodation chamber 21. A double-headed piston 19 is slidably inserted into each cylinder bore 11. A bolt insertion hole 20 for inserting a fastening bolt is provided between adjacent cylinder bores 11.

  Inside the front cylinder block 2 and the rear cylinder block 3, there is formed a swash plate accommodation chamber 21 that is provided by assembling the respective cylinder blocks. The swash plate accommodation chamber 21 includes a front cylinder block. 2 and a shaft 9 which is inserted into a shaft support hole 10 formed in the rear cylinder block 3 and whose one end protrudes from the front cylinder head 5 and is fixed to an armature of an electromagnetic clutch (not shown).

  A swash plate 22 that rotates integrally with the shaft 9 is fixed to the shaft 9 in the swash plate storage chamber 21. The swash plate 22 is rotatably supported with respect to the front side cylinder block 2 and the rear side cylinder block 3 via a thrust bearing 23, and via a hemispherical shoe 24 provided with a peripheral portion at the front and rear. It is moored in a shoe pocket 25 formed at the center of the double-headed piston 19. Therefore, when the shaft 9 rotates and the swash plate 22 rotates, the rotational motion is converted into the reciprocating linear motion of the double-ended piston 19 via the shoe 24, and the reciprocating motion of the double-ended piston 19 causes the piston 19 in the cylinder bore 11. The volume of the compression chamber 26 formed between the valve plates 4 and 6 is changed.

  Each valve plate 4, 6 is formed with a suction hole 27 and a discharge hole 28 corresponding to each cylinder bore 11, and the front and rear cylinder heads 5, 7 are supplied to the compression chamber 26. A suction chamber 17 for storing the working fluid to be operated and a discharge chamber 14 for storing the working fluid discharged from the compression chamber 26 are provided. The suction chamber 17 can communicate with the compression chamber 26 via suction holes 27 formed in the valve plates 4 and 6, and the discharge chamber 14 is continuously formed around the suction chamber 17. It is possible to communicate with the compression chamber 26 through the discharge holes 28 formed in the fourth and sixth portions.

  The suction hole 27 is opened and closed by a suction valve 29 provided on the cylinder block side end face of the valve plates 4 and 6, and the discharge hole 28 is provided on the cylinder head side end face of the valve plates 4 and 6. The valve 30 is opened and closed.

  Therefore, in the suction stroke in which the volume of the compression chamber 26 increases as the piston 19 reciprocates, the working fluid is sucked into the compression chamber 26 from the suction chamber 17 through the suction hole 27 and the suction valve 29. In the compression stroke in which the volume decreases, the working fluid compressed in the compression chamber 26 is discharged to the discharge chamber 14 through the discharge hole 28 and the discharge valve 30, and from the discharge port 16 to the outside of the compressor through the discharge passage 12. To be pumped.

  The reciprocating compressor 1 is provided in the engine room or the like on the outer peripheral surface of each of the cylinder blocks 2 and 3 described above at a position substantially symmetrical with respect to the shaft 9 (up and down positions in the drawing). A pair of attachment feet 31 for installation at the attachment location are integrally or integrally connected to be provided at a plurality of locations. In this embodiment, the shaft 9 is provided at a total of 4 locations shifted in the front-rear direction. It has been.

  The mounting foot portion 31 includes a connecting portion 31a extending in a substantially radial direction from the cylinder blocks 2 and 3, and a protruding portion 31b protruding in a direction perpendicular to the shaft 9 following the connecting portion 31a. Configured.

  The protruding portion 31b is formed in a substantially circular shape having a diameter m (about 22 mm) following the connecting portion 31a, and extends in parallel with the shaft 9 as shown in FIGS. 4 (a) and 4 (b). The rectangular flat surface 33 and tapered surfaces formed on both sides in the circumferential direction around the shaft 9 of the flat surface 33 (the upper tapered surface 34a formed upward in the mounting direction in the figure) And a lower tapered surface 34b formed in the downward direction of the mounting direction). Both the tapered surfaces 34 a and 34 b are connected to the flat surface 33 with a predetermined obtuse angle and are formed parallel to the shaft 9.

The flat surface 33 has a bolt insertion hole 32 having a diameter s (about 8.5 mm) for inserting a mounting bolt (not shown) screwed into a mounting hole provided at a mounting location in the center of the flat surface 33. It is formed to be inserted. The width of the flat surface 33 in the direction perpendicular to the extending direction of the flat surface 33 and perpendicular to the insertion direction of the bolt (along the vertical direction of the reciprocating compression 1) is a reciprocating compressor. 1 is formed slightly shorter (about 6 mm) than the width along the front-rear direction.
Here, the width l in the direction perpendicular to the bolt insertion direction may be larger than the diameter s of the bolt insertion hole 32.

  The upper taper surface 34a and the lower taper surface 34b are dimensioned in the assembling direction of one mounting foot 31 with respect to the distance (about 120 mm) between the two mounting feet 31 provided substantially symmetrically with respect to the axis of the shaft 9. The taper angle is such that an error (about 0.2 mm) can be allowed.

  When the reciprocating compressor 1 described above is attached to a mounting surface of a vehicle engine or the like, a mounting bolt is inserted into the bolt insertion hole 32 from the side where the protruding portion 31b is formed, and this mounting bolt is attached to the mounting location. This is performed by screwing into a mounting hole provided in the base plate and tightening the mounting foot 31.

  At this time, if a dimensional error during manufacturing occurs in the protruding portion 31b, the flat surface 33 of the protruding portion 31b is not necessarily parallel to the mounting surface of the mounting location. In this case, the mounting foot portion 31 is applied to the mounting surface so as to rotate about the shaft 9, but since the projecting portion 31 b is formed with a flat surface 33 extending along the shaft 9. The upper and lower side edges of the flat surface 33 are brought into contact with the mounting surface in a state close to line contact, and thus are tightened in this state.

Specifically, as shown in FIG. 5A, the flat surface 33 is formed such that the width along the vertical direction of the reciprocating compressor 1 is smaller than the vertical width of the protruding portion 31b. When the flat surface 33 is formed to be smaller than the width of the flat surface 33 along the front-rear direction of the reciprocating compressor 1, if the flat surface 33 is inclined with respect to the mounting surface 60 at the mounting location, A corner portion 35 formed at a transition portion (a portion where the flat surface 33 and the tapered surfaces 34 a and 34 b intersect) from the flat surface 33 to be contacted to the tapered surface 34 a has a radius of the bolt insertion hole 32 from the center of the bolt insertion hole 32. It will be a part located in the upper part or the lower part, and will be in the state where the bolt clamping allowance k remains. The tightening allowance k becomes shorter as the width of the flat surface 33 along the vertical direction of the reciprocating compressor 1 becomes narrower (the ridgeline of the corner portion 35 approaches the center of the insertion hole 32).
In particular, as shown in FIG. 4 and FIG. 5B, the flat surface 33 is formed narrower than the bolt insertion hole 32, and the ridge line of the corner portion 35 covers the bolt insertion hole 32 (corner portion 35). Is formed so as to pass the bolt insertion hole 32), the corner portion 35 is located inside the bolt insertion hole 32, and the tightening allowance is shorter than the tightening allowance k shown in FIG. j remains.

  When the bolt is further tightened in this state, the bolt is tightened until the flat surface 33 comes into contact with the mounting surface 60 while the mounting foot portion 31 is deformed. By tightening the bolt until the entire surface of the flat surface 33 comes into contact with the mounting surface 60 until the specified torque is reached, the entire surface of the mounting foot 31 is securely adhered to the mounting surface 60.

  At this time, since the tightening allowance (the size that requires deformation of the mounting foot 31) is smaller than the conventional one in which the flat surface 33 is formed to be equal to the area of the protruding portion 31b, the distortion of the mounting foot 31 is reduced. Thus, the propagation of stress to the cylinder bore 11 can be suppressed.

  In particular, when the ridge line of the corner portion 35 of the flat surface 33 is shortened by the bolt insertion hole 32, the entire surface of the flat surface 33 is in contact with the mounting surface 60 in addition to the tightening allowance being small. Since the absolute amount of the volume to be deformed is reduced until the bolt is tightened, the dimensional error of the mounting foot 31 can be followed even if the tightening weight of the bolt is small, and the distortion of the mounting foot 31 is further reduced. Thus, deformation of the cylinder bore 11 can be prevented.

Further, even if an error occurs in the relative position accuracy of the upper and lower mounting feet 31, since the vertical width of the mounting feet 31 is configured to be narrow, one mounting foot 31 is configured. The restraining force around the compressor shaft is suppressed, and the compressor can be securely fixed by the pair of upper and lower mounting feet 31 while suppressing distortion of the mounting feet 31.
Furthermore, in the case where an error has occurred in the relative positional accuracy of the front and rear mounting feet 31, the respective mounting feet 31 are provided separately for the front cylinder block 2 and the rear cylinder block 3. Even if the width of the flat surface 33 in the front-rear direction is relatively larger than the width in the up-down direction, it is possible to absorb the error at the joint between the two members, while suppressing the distortion of the mounting foot 31. The reciprocating compressor 1 can be reliably fixed by the mounting feet 31.
Furthermore, since the reciprocating compressor 1 of the present invention does not use a low-rigidity member for the attachment foot portion 31, it can be attached while maintaining rigidity, and a decrease in resonance point can be prevented.

  In the reciprocating compressor 1 described above, the mounting feet 31 are formed at four locations on the outer peripheral surface of the cylinder blocks 2 and 3, but may be formed at three locations. The specific contents of the present embodiment will be described below, but the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

  As shown in FIG. 5, the mounting foot 31 is provided on the outer peripheral surface of the cylinder block 2 at one position at a substantially symmetrical position in the vertical direction with respect to the axial direction of the shaft 9, and the outer peripheral surface of the cylinder block 3. 1 is provided at one end of the shaft 9 in the axial direction.

  Thus, by fixing to the mounting surface on the engine block side with the three mounting feet 31, a structure that absorbs the tightening load due to the geometric surface by the three-point support is formed, and a more stable fixing structure Can be obtained.

Experimental example

The following three types of reciprocating compressors were measured for displacement and stress of the cylinder bore 11 due to tightening. The compressors (a) to (c) shown in FIG. 7 and Table 1 correspond to the following compressors (a) to (c). That is,
(A): A conventional compressor in which the mounting foot 100 is not processed (b): A conventional compressor in which the rigidity of the mounting foot 200 is weakened and a projection is provided (c): as described in the first embodiment The compressor of the present invention is used.

The “displacement amount of the mounting foot” in Table 1 indicates the mounting in each of the three directions (axial, vertical, horizontal) when pressure under the same condition is applied to the reciprocating compressors (b) and (c). The displacement amount of the foot portions 200 and 31 is shown. When the displacement amount of the compressor in (b) is 1, the displacement amount of the compressor in (c) is 0.76.
That is, the compressor of (b) is configured to prevent the distortion of the cylinder bore 11 by configuring the rigidity of the mounting foot portion to be low, so that the rigidity is naturally the other reciprocating compressor (a) and It was low compared with (c), and it was shown that the mounting foot part of the compressor of (c) has higher rigidity. With regard to this displacement, since the compressor of (a) does not have a structure that weakens the rigidity of the mounting foot, it is predicted that the rigidity of the mounting foot is higher than at least the compressor of (b). Is done.

The stress of the cylinder bore 11 indicating the pressure received by the third-stage cylinder bore 11 in Table 1 in terms of area ratio is substantially the same for the compressor of (b) and the compressor of the present invention of (c) ( The numerical value of 1/4 or less was shown compared with the bore stress of the compressor of a).
That is, as shown in the distortion of the cylinder bore in the lowermost stage of Table 1, the compressor of (b) and the compressor of the present invention of (c) equally reduce the stress applied to the cylinder bore and It is effective for prevention.

  As shown in the above experimental examples, the reciprocating compressor 1 of the present invention was shown to be effective in preventing the deformation of the cylinder bore 11 while maintaining the rigidity of the mounting foot 31 high.

  In the above-described embodiment, the reciprocating compressor has been described as an example. However, the compressor is not particularly limited, and may be a compressor of another type such as a vane type or a scroll type.

DESCRIPTION OF SYMBOLS 1 Reciprocating compressor 2,3 Cylinder block 9 Shaft 11 Cylinder bore 31 Mounting foot part 31b Protrusion part 33 Flat surface 34a Upper taper surface 34b Lower taper surface 35 Corner | angular part

Claims (5)

A housing formed by assembling at least a front housing and a rear housing, a shaft rotatably supported by the housing and rotated by an external driving force, and the rotational movement of the shaft as a compressive action of the working fluid A compressor that includes a compression mechanism for conversion, and is installed by tightening a mounting foot portion provided on the housing to a mounting location with a bolt;
The mounting feet are provided separately for the front housing and the rear housing, respectively, and a pair is provided in the up-down direction of the compressor on at least one of the front housing and the rear housing,
The mounting foot is formed with an insertion hole through which the bolt is inserted, protrudes in the insertion direction of the bolt, and is flat at the protruding tip portion perpendicular to the insertion direction of the bolt. Providing a protrusion with a surface,
The flat surface is formed such that the width of the flat surface along the vertical direction of the compressor is smaller than the width of the protrusion in the vertical direction and smaller than the width of the flat surface along the front-rear direction of the compressor. The compressor characterized by being made.   The mold compressor according to claim 1, wherein a ridge line at a corner portion of the flat surface extends over the insertion hole.   The protrusion includes a tapered surface connected to the flat surface at a predetermined obtuse angle and parallel to the shaft, and the tapered surface is arranged in a circumferential direction around the shaft of the flat surface. The compressor according to claim 1, wherein the compressor is provided on both sides.   The compressor according to any one of claims 1 to 3, wherein the mounting foot is provided at a position that is substantially symmetric with respect to an axis of the shaft on an outer peripheral surface of the cylinder block. The compressor according to claim 4, wherein the attachment foot portion is also provided at an axial end portion of the shaft.

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