Electric fluid machinery for vehicles

Abstract

To provide an on-vehicle electric fluid machine which can inhibit damage of a vibration control elastic member.SOLUTION: A vibration control elastic member 41 of an on-vehicle electric compressor is disposed at an attachment leg 14 in a state that the vibration control elastic member 41 is not adhered to a sleeve 31 and a flange 33. The flange 33 has a protruding part 34 which protrudes toward the attachment leg 14 and is provided at a radial outside of a flange part 43 while forming a predetermined space therebetween. When a housing vibrates, the protruding part 34 and the flange part 43 contact with each other to define deformation limit of the vibration control elastic member 41.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an on-vehicle electric fluid machine. [Background technology]

[0002] An on-vehicle electric compressor, which is an example of an on-vehicle electric fluid machine, is attached to an object to be mounted on a vehicle. For this mounting, the on-vehicle electric compressor has mounting legs on its housing. The on-vehicle electric compressor is mounted to the object by fastening members inserted through the mounting legs to the object. The on-vehicle electric compressor also has a vibration-isolating elastic member to prevent vibrations caused by the operation of the electric motor of the on-vehicle electric compressor from being transmitted to the vehicle.

[0003] In the mounting structure for an electric compressor disclosed in Patent Document 1, as shown in Fig. 6, a fastening bolt 92 serving as a fastening member is inserted between a mounting foot 90 of the electric compressor and a mounting member 91 on the engine side. A shaft portion 92a of the fastening bolt 92 is screwed into the mounting member 91. A first gap adjustment portion 93, which is pressurized and plastically deformed by the fastening bolt 92 being screwed in, is disposed between a head portion 92b and one end face of the mounting foot 90 as a vibration-proof elastic member. In addition, a second gap adjustment portion 94, which is pressurized and plastically deformed by the fastening bolt 92 being screwed in, is disposed between the other end face of the mounting foot 90 and the mounting member 91 as a vibration-proof elastic member.

[0004] In the mounting structure for an electric compressor disclosed in Patent Document 1, pressing washers 95 are provided between the first gap adjustment portion 93 and the head portion 92b, and between the second gap adjustment portion 94 and the mounting foot 90. A collar portion 96 made of a metal pipe is inserted into the mounting foot 90.

[0005] The first gap adjustment portion 93 and the second gap adjustment portion 94 each have a cylindrical portion 93a, 94a and a flange portion 93b, 94b integrally therewith. The cylindrical portions 93a, 94a are disposed between the outer peripheral surface of the collar portion 96 and the inner peripheral surface of the mounting foot 90. The flange portion 93b of the first gap adjustment portion 93 is disposed between the pressing washer 95 and one end surface of the mounting foot 90, and the flange portion 94b of the second gap adjustment portion 94 is disposed between the pressing washer 95 and the other end surface of the mounting foot 90.

[0006] Of the vibrations of the housing of the electric compressor, vibration components in a direction parallel to the axial direction of fastening bolt 92 are damped by flange portions 93b, 94b. Moreover, vibration components in a direction perpendicular to the axial direction of fastening bolt 92 are damped by cylindrical portions 93a, 94a. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2010-138808 A Summary of the Invention [Problem to be solved by the invention]

[0008] Vibration of the housing of the electric compressor causes the flanges 93b, 94b to elastically deform in a direction perpendicular to the axial direction of the fastening bolt 92. At this time, the more the flanges 93b, 94b elastically deform radially outward, the greater the stress concentration occurring near the boundaries between the flanges 93b, 94b and the cylindrical portions 93a, 94a. As a result, there is a risk of damage to the boundaries between the flanges 93b, 94b and the cylindrical portions 93a, 94a. [Means for solving the problem]

[0009] The in-vehicle electric fluid machine for solving the above problems includes a housing that accommodates an electric motor therein and has mounting legs with insertion holes formed on each end surface in the axial direction, a shaft portion that is inserted into the insertion hole, a fastening member that has a head at one end of the shaft portion and fastens the other end of the shaft portion to an object to which the mounting leg is to be attached, a sleeve that is disposed between the mounting leg and the shaft portion and receives a fastening force from the head, and vibration-proof elastic members that are disposed on both sides of the mounting leg in the axial direction and are disposed between an inner peripheral surface of the mounting leg and an outer peripheral surface of the sleeve. and an annular plate that applies the fastening force to the mounting leg via the sleeve and the flange, wherein the vibration-proof elastic member is placed on the mounting leg in a non-adhered state to the sleeve and the annular plate, the annular plate having a ridge portion that protrudes toward the mounting leg and is provided radially outward of the flange at a predetermined gap, and wherein the ridge portion and the flange come into contact when the housing vibrates, thereby determining the deformation limit of the vibration-proof elastic member.

[0010] According to this, when vibrations caused by the operation of the electric motor occur in the housing, vibration components are input to the vibration-proof elastic member. Then, pressure is applied to the flange between the annular plate and the mounting leg, so that the flange attempts to elastically deform radially outward. At this time, the flange abuts against the convex rib portion, thereby defining the deformation limit of the vibration-proof elastic member. This prevents the flange from elastically deforming excessively radially outward. As a result, stress concentration occurring near the boundary between the cylindrical portion and the flange can be reduced, thereby preventing damage near the boundary between the cylindrical portion and the flange.

[0011] In an on-vehicle electric fluid machine, the convex streak portion may have a protruding end face at the tip of the protruding direction from the annular plate toward the mounting leg, and when the convex streak portion and the flange portion are in contact, the protruding end face may be spaced apart from the end face of the mounting leg.

[0012] According to this, even if the flange is pressurized and becomes thin, the protruding end face does not abut against the end face of the mounting leg, and therefore noise caused by the protruding portion abutting against the mounting leg is not generated. In the on-vehicle electric fluid machine, the sleeve may have a flange extending in the radial direction from an axial end of the sleeve, and the annular plate may be formed by the flange.

[0013] According to this, the ridge portion and the flange can be provided on the sleeve, and therefore, by inserting the sleeve into the insertion hole of the mounting leg, the ridge portion and the flange can be provided on the mounting leg.

[0014] In the on-vehicle electric fluid machine, the annular plate may be a washer. According to this, by providing a convex rib portion on the washer that suppresses loosening of the head portion, excessive elastic deformation of the flange portion can be suppressed without increasing the number of parts. Effect of the Invention

[0015] According to the present invention, damage to the vibration-isolating elastic member can be suppressed. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is an exploded perspective view showing the vehicle-mounted electric compressor and the vibration isolation device. [Diagram 2] 1A is a cross-sectional view showing the mounting structure of the mounting leg, and FIG. 1B is an enlarged cross-sectional view showing the flange portion and the protruding strip portion. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 11 is a cross-sectional view showing a vibration isolation device according to another embodiment. [Figure 6] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] An embodiment in which an on-vehicle electric fluid machine is embodied as an on-vehicle electric compressor will be described below with reference to Figures 1 to 5. The on-vehicle electric compressor is used in an air conditioner for a vehicle. As shown in Fig. 1, an in-vehicle electric compressor 10 includes a housing 11, an electric compression mechanism (not shown) including an electric motor 12, and a vibration isolation device 20. The housing 11 has a cylindrical accommodating portion 13 and a plurality of mounting legs 14. The plurality of mounting legs 14 are provided for mounting the housing 11 to an attachment target 50 that is a part of a vehicle (not shown). The electric compression mechanism including the electric motor 12 is accommodated inside the accommodating portion 13. In other words, the housing 11 accommodates the electric motor 12 inside.

[0018] The electric compression mechanism includes, in addition to the electric motor 12, a rotating shaft, a compression unit connected to an end of the rotating shaft, and an inverter, all of which are not shown. The housing 11 is formed with an intake port through which a refrigerant as a fluid is drawn in and a discharge port through which the refrigerant is discharged. The rotating shaft is supported by the housing 11 in a rotatable state. In the electric compression mechanism, the rotating shaft is driven to rotate by the electric motor 12. As the rotating shaft rotates, the refrigerant drawn into the housing 11 from the intake port of the housing 11 is compressed, and the compressed refrigerant is discharged outside the housing 11 from the discharge port of the housing 11.

[0019] Each of the multiple mounting legs 14 is cylindrical. The direction in which the central axis L of the mounting legs 14 extends is the axial direction X of the mounting legs 14. The central axes L of the multiple mounting legs 14 are perpendicular to the axis M of the storage section 13. The multiple mounting legs 14 are arranged in the storage section 13 so that their central axes L are parallel to each other. Since the multiple mounting legs 14 have the same configuration, the following will describe one mounting leg 14 and will omit descriptions of the remaining two mounting legs 14.

[0020] As shown in Fig. 2(a), an insertion hole 15 is formed in the mounting leg 14. The insertion hole 15 penetrates the mounting leg 14 in the axial direction X. The insertion hole 15 is composed of large diameter holes 15a on both sides of the mounting leg 14 in the axial direction X, and a small diameter hole 15b located between the large diameter holes 15a. The mounting leg 14 has an annular surface 16 connecting the inner circumferential surface of the large diameter hole 15a and the inner circumferential surface of the small diameter hole 15b.

[0021] The mounting leg 14 has a first end face 14a as an end face at a first end in the axial direction X, and a second end face 14b as an end face at a second end in the axial direction X. Each of the first end face 14a and the second end face 14b is an annular surface surrounding an insertion hole 15. Therefore, the insertion hole 15 is formed in the first end face 14a and the second end face 14b of the mounting leg 14.

[0022] The insertion hole 15 opens at a first end face 14a and a second end face 14b of the mounting leg 14. The first end face 14a and the second end face 14b are flat faces perpendicular to the central axis L. The vehicle-mounted electric compressor 10 is attached to the mounting object 50 with the second end face 14b of the mounting leg 14 adjacent to the mounting object 50. The mounting object 50 has a female thread 52 extending in the axial direction X from an adjacent surface 51 adjacent to the second end face 14b of the mounting leg 14.

[0023] Next, the vibration isolation devices 20 will be described. The vibration isolation devices 20 are provided on both the first end face 14a side and the second end face 14b side of the mounting leg 14. The two vibration isolation devices 20 have the same structure. Therefore, the structure of one of the vibration isolation devices 20 will be described, and the structure of the other vibration isolation device 20 will not be described.

[0024] As shown in FIGS. 1, 2(a) and 3, the vibration isolation device 20 is installed on both end face sides of the mounting legs 14 by fastening fastening members 21 made of bolts to the mounting object 50. The fastening member 21 is made of metal. The fastening member 21 has a shaft portion 22 that is inserted into the insertion hole 15, and a head 23 at one end of the shaft portion 22. A male thread 22a is provided on the outer circumferential surface on the other end side of the shaft portion 22. The fastening member 21 attaches the mounting leg 14 to the mounting object 50 by fastening the male thread 22a at the other end of the shaft portion 22 to a female thread 52 of the mounting object 50.

[0025] The vibration-isolating device 20 has a sleeve 31 , a flange 33 as an annular plate, a ridge portion 34 , and a vibration-isolating elastic member 41 . The sleeve 31 is made of metal. The sleeve 31 is cylindrical. The sleeve 31 and the metal flange 33 are integral with each other. The flange 33 extends in the radial direction of the sleeve 31 from an end of the sleeve 31 in the axial direction.

[0026] The outer diameter of the sleeve 31 is smaller than the hole diameter of the small diameter hole 15b. The sleeve 31 is inserted into the insertion hole 15 of the mounting leg 14. The sleeve 31 has a sleeve hole 32. The sleeve hole 32 penetrates the sleeve 31 in the axial direction. The shaft portion 22 of the fastening member 21 is inserted into the sleeve hole 32. Therefore, the shaft portion 22 of the fastening member 21 penetrates the sleeve 31. Therefore, the sleeve 31 is disposed between the outer peripheral surface of the shaft portion 22 and the inner peripheral surface of the mounting leg 14. In other words, the sleeve 31 is disposed between the mounting leg 14 and the shaft portion 22.

[0027] The flange 33 extends in a disk shape from one end of the sleeve 31 in the axial direction. The sleeve 31 and the flange 33 are made of the same metal material. The flange 33 is disk-shaped with a sleeve hole 32 opening in the center. The flange 33 has a first abutment surface 33a on a first surface in the plate thickness direction, and a second abutment surface 33b on a second surface in the plate thickness direction. The first abutment surface 33a is an annular surface that is connected to the outer circumferential surface of the sleeve 31. The second abutment surface 33b is an annular surface located on the opposite side to the first abutment surface 33a.

[0028] The flange 33 has a ridge portion 34 that protrudes from the flange toward the mounting leg 14. The ridge portion 34 is cylindrical and concentric with the sleeve 31. As shown in Fig. 2(b), an inner peripheral surface 34a of the ridge portion 34 intersects with and is connected to the first contact surface 33a.

[0029] 2(a) and 3, the shortest distance between the inner peripheral surface 34a of the protruding portion 34 and the outer peripheral surface 31a of the sleeve 31 is defined as the separation distance K of the protruding portion 34. The separation distance K of the protruding portion 34 is constant in the circumferential direction of the flange 33.

[0030] The outer peripheral surface 34b of the convex ridge portion 34 intersects with and is connected to the second contact surface 33b. The convex ridge portion 34 has a protruding end surface 34d at the tip in the direction in which it protrudes from the flange 33 toward the mounting leg 14. The protruding end surface 34d is an annular surface.

[0031] The vibration-proof elastic member 41 is made of an elastic material. An example of the elastic material is rubber. The vibration-proof elastic member 41 damps vibrations of the housing 11 caused by the operation of the electric motor 12, thereby preventing the vibrations from being transmitted to the vehicle via the housing 11.

[0032] The vibration-proof elastic member 41 has a cylindrical portion 42 and a disk-shaped flange portion 43. The outer diameter of the cylindrical portion 42 is smaller than the diameter of the large diameter hole 15a. The inner diameter of the cylindrical portion 42 is smaller than the diameter of the small diameter hole 15b. The cylindrical portion 42 has an insertion hole 42a. The insertion hole 42a passes through the vibration-proof elastic member 41 in the axial direction. The cylindrical portion 42 has a tip surface 42b at one of its axial ends, which is opposite to the end where the flange portion 43 is provided. The axial dimension of the cylindrical portion 42 is smaller than the axial dimension of the sleeve 31.

[0033] The flange portion 43 extends radially outward from the axial end of the cylindrical portion 42, opposite the tip end surface 42b. The flange portion 43 is disk-shaped with an insertion hole 42a opening in the center. The flange portion 43 has a first clamping surface 43a on a first surface in the plate thickness direction. The flange portion 43 has a second clamping surface 43b on a second surface in the plate thickness direction. The first clamping surface 43a is an annular surface connected to the outer circumferential surface of the cylindrical portion 42. The first clamping surface 43a is a surface that abuts against the end surface of the mounting leg 14. The second clamping surface 43b is an annular surface located opposite the first clamping surface 43a.

[0034] The second clamping surface 43b is a surface that abuts against the first abutment surface 33a of the flange 33. The shortest distance from the inner circumferential surface 43c to the outer circumferential surface 43d of the flange portion 43 is defined as the width R of the flange portion 43. The width R of the flange portion 43 is smaller than the separation distance K from the outer circumferential surface 31a of the sleeve 31 to the inner circumferential surface 34a of the convex strip portion 34. Note that, at the first end surface 14a and the second end surface 14b of the mounting leg 14, the shortest distance from the inner circumferential surface of the insertion hole 15 to the outer circumferential surface of the mounting leg 14 is larger than the width R of the flange portion 43.

[0035] Next, the mounting structure of the mounting legs 14 equipped with the vibration isolators 20 will be described. 2(a), a cylindrical portion 42 of a vibration-proof elastic member 41 is inserted into the large diameter hole 15a of the mounting leg 14 on the second end face 14b side of the mounting leg 14. A tip surface 42b of the cylindrical portion 42 abuts against the annular surface 16 on the second end face 14b side. In addition, a first clamping surface 43a of the flange portion 43 abuts against the second end face 14b of the mounting leg 14. In addition, an outer peripheral surface 43d of the flange portion 43 is located inside the outer peripheral surface of the mounting leg 14.

[0036] The sleeve 31 is inserted into the insertion hole 42a of the vibration-proof elastic member 41. Therefore, the cylindrical portion 42 of the vibration-proof elastic member 41 is disposed between the inner peripheral surface of the mounting leg 14 and the outer peripheral surface of the sleeve 31. The sleeve 31 is inserted into the mounting leg 14 beyond the tip surface 42b of the cylindrical portion 42. The first contact surface 33a of the flange 33 contacts the second clamping surface 43b of the flange portion 43. The second contact surface 33b of the flange 33 contacts the adjacent surface 51 of the mounting target 50. In addition, the vibration-proof elastic member 41, the sleeve 31, and the flange 33 are not bonded to each other, and can move relative to each other in the axial direction and the radial direction. Therefore, the vibration-proof elastic member 41 is disposed on the mounting leg 14 in a non-bonded state with respect to the sleeve 31 and the flange 33.

[0037] As shown in FIG. 2(b), the inner peripheral surface 34a of the convex rib portion 34 is spaced from the outer peripheral surface 43d of the flange portion 43. In other words, the flange 33 has the convex rib portion 34 provided radially outward of the flange portion 43 with a predetermined gap S therebetween. Therefore, an annular gap S is defined between the inner peripheral surface 34a of the convex rib portion 34 and the outer peripheral surface 43d of the flange portion 43. The convex rib portion 34 protrudes from the flange 33 toward the mounting leg 14. The protruding end surface 34d of the convex rib portion 34 is spaced from the second end surface 14b of the mounting leg 14 in the axial direction X.

[0038] On the side of the first end face 14a of the mounting leg 14, the cylindrical portion 42 of the vibration-proof elastic member 41 is inserted into the large diameter hole 15a of the mounting leg 14. The tip surface 42b of the cylindrical portion 42 abuts against the annular surface 16. In addition, the first clamping surface 43a of the flange portion 43 abuts against the first end face 14a of the mounting leg 14. In addition, the outer peripheral surface 43d of the flange portion 43 is located inside the outer peripheral surface of the mounting leg 14.

[0039] The sleeve 31 is inserted into the insertion hole 42a of the vibration-proof elastic member 41. Therefore, the cylindrical portion 42 of the vibration-proof elastic member 41 is disposed between the inner peripheral surface of the mounting leg 14 and the outer peripheral surface of the sleeve 31. The sleeve 31 is inserted into the mounting leg 14 beyond the tip surface 42b of the cylindrical portion 42. The first contact surface 33a of the flange 33 contacts the second clamping surface 43b of the flange portion 43.

[0040] The tip surface of the sleeve 31 inserted from the first end surface 14a and the tip surface of the sleeve 31 inserted from the second end surface 14b abut against each other within the mounting leg 14. The inner peripheral surface 34a of the convex streak portion 34 is spaced from the outer peripheral surface 43d of the flange portion 43. In other words, the flange 33 has the convex streak portion 34 provided radially outward of the flange portion 43 with a predetermined gap S therebetween. Therefore, an annular gap S is defined between the inner peripheral surface 34a of the convex streak portion 34 and the outer peripheral surface 43d of the flange portion 43.

[0041] The dimension of the gap S along the radial direction of the vibration-proof elastic member 41 is set to a dimension that determines the deformation limit of the flange 43 and suppresses excessive extension of the flange 43 when the vibration-proof elastic member 41 is pressurized in the axial direction and the flange 43 extends radially outward. In order to determine the deformation limit of the flange 43, the convex rib portion 34 is provided on the radial outside of the flange 43 with a predetermined gap S therebetween.

[0042] The shaft portion 22 of the fastening member 21 is inserted into each of the sleeve holes 32 of the two sleeves 31. The male thread 22a of the shaft portion 22 is screwed into the female thread 52 of the attachment object 50, thereby fastening the fastening member 21 to the attachment object 50. The fastening force from the head portion 23 of the fastening member 21 is received by the sleeve 31. In addition, the fastening force received by the sleeve 31 acts on the mounting leg 14 via the flange 33 and the flange portion 43. As a result, the fastening force from the head portion 23 pressurizes the vibration-proof elastic member 41 in the axial direction.

[0043] Then, the first clamping surface 43a comes into contact with the first end face 14a or the second end face 14b, and the second clamping surface 43b comes into contact with the first abutment surface 33a of the flange 33. Then, the flange portion 43 is clamped between the mounting leg 14 and the flange 33 in the axial direction X, and the flange portion 43 is pressurized in the axial direction X. In addition, the cylindrical portion 42 is pressurized in the axial direction X of the mounting leg 14 between the annular surface 16 and the flange 33.

[0044] Next, the operation of the vehicle-mounted electric compressor 10 will be described. Vibrations caused by the operation of the electric motor 12 are generated in the housing 11 of the in-vehicle electric compressor 10. When the housing 11 vibrates, the vibration components parallel to the axial direction of the fastening member 21 are damped by the cylindrical portion 42 and the flange portion 43 of the vibration-proof elastic member 41, and the vibration components perpendicular to the axial direction of the fastening member 21 are damped by the cylindrical portion 42. This prevents the vibrations of the housing 11 from being transmitted to the object 50 to which the housing 11 is attached.

[0045] 4, when vibration components are input to the vibration-proof elastic member 41, pressure is applied to the flange 43 between the flange 33 and the end faces 14a, 14b of the mounting leg 14, causing the flange 43 to elastically deform. At this time, the outer peripheral surface 43d of the flange 43, which has elastically deformed radially outward, comes into contact with the inner peripheral surface 34a of the convex strip portion 34, thereby defining the deformation limit of the flange 43, and as a result, the extension of the flange 43 is restricted.

[0046] According to this embodiment, the following effects can be obtained. (1) The flange 33 has the convex rib portion 34 at a predetermined gap S on the radially outer side of the flange portion 43. Therefore, when a vibration component is input to the vibration-proof elastic member 41 and the flange portion 43 is pressurized and elastically deformed, the elastically deformed flange portion 43 comes into contact with the convex rib portion 34, restricting the radially outward extension of the flange portion 43. In other words, the convex rib portion 34 can prevent the flange portion 43 from excessively extending radially outward. Therefore, stress concentration near the boundary between the cylindrical portion 42 and the flange portion 43 can be alleviated, and damage near the boundary between the cylindrical portion 42 and the flange portion 43 due to stress concentration can be suppressed. As a result, the deterioration of the strength of the vibration-proof elastic member 41 can be suppressed.

[0047] (2) Before vibration components are input, a predetermined gap S exists between the outer peripheral surface 43d of the flange portion 43 and the inner peripheral surface 34a of the convex rib portion 34. For this reason, when vibration components are input to the vibration-proof elastic member 41, slight radial outward extension of the flange portion 43 is permitted, and elastic deformation of the vibration-proof elastic member 41 is permitted. Therefore, the vibration-proof function due to the elastic deformation of the vibration-proof elastic member 41 can be effectively exhibited.

[0048] (3) The dimension of gap S along the radial direction of vibration-proof elastic member 41 is set to a dimension that determines the deformation limit of flange 43 when flange 43 stretches radially outward. Therefore, when vibration components are input to vibration-proof elastic member 41, excessive stretch of flange 43 can be restricted while allowing some radial outward stretch of flange 43.

[0049] (4) The protruding end face 34d of the convex rib portion 34 is spaced in the axial direction X from the first end face 14a or the second end face 14b of the mounting leg 14. Even if the vibration-proof elastic member 41 is pressurized in the axial direction and the flange portion 43 becomes thinner, the protruding end face 34d does not come into contact with the first end face 14a or the second end face 14b of the mounting leg 14. For this reason, noise is not generated due to the protruding rib portion 34 coming into contact with the mounting leg 14.

[0050] (5) The convex rib portion 34 is provided around the entire circumference of the flange 33 and covers the entire outer circumferential surface 43d of the flange portion 43. This restricts the deformation limit of the flange portion 43 around the entire circumference and prevents localized elongation of the flange portion 43. As a result, stress concentration caused by localized deformation of the vibration-proof elastic member 41 can be suppressed, and a decrease in strength caused by damage to the vibration-proof elastic member 41 can be suppressed.

[0051] (6) The vibration-proof elastic member 41 is not bonded to the sleeve 31 and the flange 33. This eliminates the need for a process of vulcanization bonding the vibration-proof elastic member 41 to the sleeve 31 and the flange 33, making it possible to reduce the cost of the in-vehicle electric compressor 10. In addition, because the vibration-proof elastic member 41 is not bonded to the sleeve 31 and the flange 33, when a vibration component is input to the vibration-proof elastic member 41, the flange portion 43 extends radially outward, but the convex rib portion 34 can determine the radially outward deformation limit of the flange portion 43. This makes it possible to reduce the cost of the in-vehicle electric compressor 10 while suppressing a decrease in strength caused by damage to the vibration-proof elastic member 41.

[0052] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0053] 5, the flange 33 may be omitted from the sleeve 31. In this case, a washer 44 serving as an annular plate is disposed between one axial end face of the sleeve 31 and the head 23, and another washer 44 serving as an annular plate is disposed between the other axial end face of the sleeve 31 and the attachment object 50.

[0054] The washer 44 may have a protruding portion 45. The washer 44 has a through hole 44a in the center, through which the shaft portion 22 of the fastening member 21 is inserted. The protruding portion 45 is provided along the outer periphery of the washer 44. The protruding portion 45 may be provided around the entire circumference of the washer 44, or a plurality of protruding portions 45 may be provided at intervals in the circumferential direction of the washer 44.

[0055] According to this, by providing the convex rib portion 45 on the washer 44 that suppresses loosening of the head 23 of the fastening member 21, excessive elastic deformation of the flange portion 43 can be suppressed without increasing the number of parts. The ridges 34 may be provided at intervals in the circumferential direction of the flange 33. In this case, when a vibration component is input to the vibration-proof elastic member 41 and the flange 43 is pressurized and elastically deformed, the outer peripheral surface 43d of the elastically deformed flange 43 comes into contact with the inner surface of the ridge 34.

[0056] When a vibration component is input to the vibration-proof elastic member 41, so long as the flange 43 abuts against the ridge 34 to define the deformation limit, the flange 43 may be in contact with the ridge 34 before the vibration component is input. In other words, the predetermined gap S between the flange 43 and the ridge 34 becomes zero.

[0057] Before a vibration component is input to the vibration-isolating elastic member 41, the protruding end surface 34d of the convex portion 34 may be in contact with the first end surface 14a or the second end surface 14b of the mounting leg 14. The fluid to be compressed by the in-vehicle electric compressor 10 may be something other than a refrigerant, such as air.

[0058] The on-vehicle electric fluid machine is not limited to the on-vehicle electric compressor 10 having a compression unit that compresses a fluid. For example, when the on-vehicle electric fluid machine is mounted on a fuel cell vehicle, the on-vehicle electric fluid machine may be an electric pump device having a pump that supplies hydrogen to the fuel cell and an on-vehicle electric motor that drives the pump. [Explanation of symbols]

[0059] 10...vehicle-mounted electric compressor as vehicle-mounted electric fluid machine, 11...housing, 12...electric motor, 14...mounting leg, 14a...first end face, 14b...second end face, 15...insertion hole, 21...fastening member, 22...shaft portion, 23...head, 31...sleeve, 33...flange as annular plate, 34, 45...convex rib portion, 34d...protruding end surface, 41...vibration-proof elastic member, 42...cylindrical portion, 43...flange portion, 44...washer as annular plate, 50...object to be mounted.

Claims

1. a housing that accommodates the electric motor therein and has mounting legs with insertion holes formed in each end surface in the axial direction; a fastening member having a shaft portion inserted into the insertion hole and a head at one end of the shaft portion, the other end of the shaft portion being fastened to an attachment target to attach the mounting leg to the attachment target; a sleeve disposed between the mounting leg and the shaft portion and receiving a fastening force from the head portion; anti-vibration elastic members disposed on both sides of the mounting leg in the axial direction, the anti-vibration elastic members having a cylindrical portion disposed between an inner peripheral surface of the mounting leg and an outer peripheral surface of the sleeve, and a flange portion at an end portion extending radially outwardly of the cylindrical portion; an annular plate that applies the fastening force to the mounting leg via the sleeve and the flange, the vibration-isolating elastic member is disposed on the mounting leg in a non-adhesive state with respect to the sleeve and the annular plate, the flange portion has a first clamping surface connected to an outer circumferential surface of the cylindrical portion and abutting against an end surface of the mounting leg, a second clamping surface located on the opposite side to the first clamping surface, and an outer circumferential surface connecting the first clamping surface and the second clamping surface, the annular plate has a protruding portion protruding toward the mounting leg and provided radially outwardly of the flange portion with a predetermined gap therebetween, an outer circumferential surface of the mounting leg is located radially inward from an inner circumferential surface of the protruding strip portion; a projection portion and an outer peripheral surface of the flange portion contacting each other entirely when the housing vibrates, thereby defining a deformation limit of the vibration-proof elastic member.

2. a housing that accommodates the electric motor therein and has mounting legs with insertion holes formed in each end surface in the axial direction; a fastening member having a shaft portion inserted into the insertion hole and a head at one end of the shaft portion, the other end of the shaft portion being fastened to an attachment target to attach the mounting leg to the attachment target; a sleeve disposed between the mounting leg and the shaft portion and receiving a fastening force from the head portion; anti-vibration elastic members disposed on both sides of the mounting leg in the axial direction, the anti-vibration elastic members having a cylindrical portion disposed between an inner peripheral surface of the mounting leg and an outer peripheral surface of the sleeve, and a flange portion at an end portion extending radially outwardly of the cylindrical portion; an annular plate that applies the fastening force to the mounting leg via the sleeve and the flange, the vibration-isolating elastic member is disposed on the mounting leg in a non-adhesive state with respect to the sleeve and the annular plate, the annular plate has a protruding portion protruding toward the mounting leg and provided radially outwardly of the flange portion with a predetermined gap therebetween, a deformation limit of the vibration-proof elastic member is defined by the projection and the flange coming into contact with each other when the housing vibrates, the protruding rib portion has a protruding end surface at a tip end in a protruding direction from the annular plate toward the mounting leg, and the protruding end surface is spaced from the end surface of the mounting leg when the protruding rib portion and the flange portion are in contact with each other, the vibration-damping elastic member separates the inner circumferential surface of the mounting leg from the outer circumferential surface of the sleeve by the cylindrical portion that abuts against the inner circumferential surface of the mounting leg and the outer circumferential surface of the sleeve, and separates the end face of the mounting leg from the annular plate by the flange portion that abuts against the end face of the mounting leg and the annular plate.

3. a housing that accommodates the electric motor therein and has mounting legs with insertion holes formed in each end surface in the axial direction; a fastening member having a shaft portion inserted into the insertion hole and a head at one end of the shaft portion, the other end of the shaft portion being fastened to an attachment target to attach the mounting leg to the attachment target; a sleeve disposed between the mounting leg and the shaft portion and receiving a fastening force from the head portion; anti-vibration elastic members disposed on both sides of the mounting leg in the axial direction, the anti-vibration elastic members having a cylindrical portion disposed between an inner peripheral surface of the mounting leg and an outer peripheral surface of the sleeve, and a flange portion at an end portion extending radially outwardly of the cylindrical portion; an annular plate that applies the fastening force to the mounting leg via the sleeve and the flange, the vibration-isolating elastic member is disposed on the mounting leg in a non-adhesive state with respect to the sleeve and the annular plate, the annular plate has a protruding portion protruding toward the mounting leg and provided radially outwardly of the flange portion with a predetermined gap therebetween, a deformation limit of the vibration-proof elastic member is defined by the projection and the flange coming into contact with each other when the housing vibrates, The convex streak portion has a protruding end face at a tip in a protruding direction from the annular plate toward the mounting leg, and when the convex streak portion and the flange portion are in contact with each other, the protruding end face is separated from the end face of the mounting leg and the protruding end face is exposed.

4. 4. An on-vehicle electric fluid machine according to claim 1, wherein the sleeve has a flange extending in the radial direction from an axial end of the sleeve, and the annular plate is formed by the flange.

5. The on-vehicle electric fluid machine according to any one of claims 1 to 3, wherein the annular plate is a washer.

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