KR102750182B1 - Electric Compressor Mounting Bracket - Google Patents

Abstract

The present invention provides an electric compressor mounting bracket, comprising: a bracket housing having a plurality of first fixing holes and a plurality of second fixing holes formed therein; a body insulating member coupled to the first fixing holes of the bracket housing and preventing a resonant frequency while fixing the bracket housing to a body; and a bracket insulating member coupled to the second fixing holes of the bracket housing and insulating an electric compressor from vibration while fixing the electric compressor to the bracket housing, wherein the body insulating member and the bracket insulating member have different spring constant values.
Therefore, by using body insulating members and bracket insulating members having different spring constant values to secure the electric compressor and bracket housing to the bracket housing and the body, respectively, vibration isolation and avoidance of resonant frequency through natural frequency separation can be achieved simultaneously.

Description

Electric Compressor Mounting Bracket

The present invention relates to a bracket for mounting an electric compressor, and more specifically, to a bracket for mounting an electric compressor which improves the assembling property with an electric compressor when mounting the electric compressor on a vehicle body and improves vibration insulation due to contact between the electric compressor, which is a metal member, and the vehicle body, which is a metal member.

A typical compressor is a device that sucks in refrigerant into a sealed space, compresses it, and then discharges it. It consists of a compression unit that compresses the refrigerant, a driving unit that drives it, and a housing that protects these internal structures and forms their exterior.

When an electric compressor that drives a compression unit with rotational force generated by electromagnetic waves is used in a product such as a vehicle, refrigerator or air conditioner, the lower part of the electric compressor is fixed by a bracket, and the bracket is supported by a vibration-proof member and fixed to the base.

When these electric compressors operate, tremendous noise and vibration are generated during the process of obtaining driving force from the driving device, the process of operating the compression device by the driving force, the process of compressing the fluid, and the process of discharging the compressed fluid. However, this noise and vibration can be eliminated to some extent by using soundproofing devices or absorption devices separately installed inside the electric compressor.

However, the vibration generated from the internal structure of the electric compressor acts as a vibration source and is transmitted to the bracket and base that fix the housing. At this time, resonance occurs when a specific vibration frequency (high level vibration frequency) generated from the electric compressor matches the natural vibration frequency of the bracket.

If the frequency generated by this type of resonance matches the frequency of the base, a larger vibration occurs, causing vibration or abnormal noise to be generated in the entire product where the electric compressor is installed.

As for conventional technology, reference can be made to Public Utility Model No. 20-2000-0009479 (June 5, 2000), “Bracket for fixing compressor of vehicle air conditioner.”

The present invention has been created to solve the above problems, and the purpose of the present invention is to provide an electric compressor mounting bracket that improves the assembly stability with respect to an electric compressor mounted on a bracket housing, limits displacement of the electric compressor in the upward and downward directions, and limits vibration and noise caused by contact between the electric compressor and a body according to the behavior of the electric compressor.

In order to achieve the above object, the present invention provides an electric compressor mounting bracket, comprising: a bracket housing having a plurality of first fixing holes and a plurality of second fixing holes formed therein; a body insulating member coupled to the first fixing holes of the bracket housing and preventing a resonant frequency while fixing the bracket housing to a body; and a bracket insulating member coupled to the second fixing holes of the bracket housing and insulating an electric compressor from vibration while fixing the electric compressor to the bracket housing, wherein the body insulating member and the bracket insulating member have different spring constant values.

In the bracket for mounting an electric compressor according to the present invention, the body insulation member is for avoiding a resonance point between the electric compressor and the body, and the body insulation member may include a cylindrical first outer bushing having a hollow interior, a first insulating bushing inserted into the hollow interior of the first outer bushing and forming a hollow interior, a first guide bushing inserted into the hollow interior of the first insulating bushing and forming a bolt hole penetrating upward and downward in the center to guide a bolt to the bolt hole, and a stopper plate which blocks contact between a head of a fastening bolt provided on the upper side of the first guide bushing and fastened to the body and the upper end of the first insulating bushing, and limits upward displacement of the first insulating bushing and the first guide bushing due to vibration when the electric compressor is in operation.

A plurality of catches may be formed at the top and bottom of the first insulating bushing, respectively, and the plurality of catches may be arranged radially at the top and bottom of the first insulating bushing.

The above bracket insulation member is for insulating the vibration value generated when the electric compressor is operated from being transmitted to the bracket housing, and the bracket insulation member may include a cylindrical second outer bushing having a hollow interior, a second insulating bushing inserted into the hollow interior of the second outer bushing and having a hollow interior, a second guide bushing inserted into the hollow interior of the second insulating bushing and having a through-hole extending upward and downward through the center to guide a bolt through the through-hole, a caulking bolt inserted from the bottom to the top into the through-hole of the second guide bushing and fixing the electric compressor to the bracket housing, and a displacement limiting washer coupled to the head of the caulking bolt to limit upward displacement.

It is preferable that the above second outer bushing further forms a displacement limiting flange bent in the outer circumference direction along the outer circumference of the upper side.

It is preferable that the above second insulating bushing further forms a noise prevention piece that is folded in the outer circumference direction along the outer circumference on its upper end.

The above displacement limiting washer may include a hard inner washer member and an outer washer member made of a soft rubber or synthetic resin material.

The spring constant value of the above bracket insulating member can have a range of 3 to 7 kgf/㎠, and the spring constant value of the above body insulating member can have a range of 40 to 80 kgf/㎠.

The electric compressor mounting bracket according to the present invention uses a body insulating member and a bracket insulating member having different spring constant values to fix the electric compressor and the bracket housing to the bracket housing and the body, respectively, thereby simultaneously achieving vibration isolation and avoidance of resonant frequency by natural frequency separation.

In addition, the assembly stability with the electric compressor, which is a component mounted on the bracket housing, can be improved, and the displacement of the electric compressor in the upper and lower directions can be limited, so that vibration and noise generation due to contact between the electric compressor and the body according to the behavior of the electric compressor can be minimized.

FIG. 1 is an exemplary drawing showing a state in which an electric compressor is mounted on an electric compressor mounting bracket according to one embodiment of the present invention.
Fig. 2 is an exemplary drawing showing a state in which a body insulating member and a bracket insulating member are mounted in the bracket housing illustrated in Fig. 1.
Figure 3 is a drawing illustrating the configuration of the body insulation member illustrated in Figure 2.
Fig. 4 is a cross-sectional view showing the cross-section of the body insulation member illustrated in Fig. 3.
Figure 5 is a drawing illustrating the configuration of the bracket insulating member illustrated in Figure 2.
Fig. 6 is a cross-sectional view showing a cross-section of the bracket insulating member illustrated in Fig. 5.
Figure 7 is a drawing showing the electric compressor and subframe mounted on a bracket.
FIG. 8 is a graph showing the relationship between vibration noise and operating frequency in the states where the “A” portion of FIG. 7 is fastened only with bolts, where it is fastened using a bracket insulating member having a spring constant value of 4 kgf/mm and a body insulating member having a spring constant value of 40 kgf/mm, where it is fastened using a bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member having a spring constant value of 70 kgf/mm, and where the bracket is fastened to the body using bolts without a bracket insulating member having a spring constant value of 7 kgf/mm and the body insulating member.
FIG. 9 is a graph showing the relationship between vibration noise and operating frequency in the states where the “B” portion of FIG. 7 is fastened only with bolts, where it is fastened using a bracket insulating member having a spring constant value of 4 kgf/mm and a body insulating member having a spring constant value of 40 kgf/mm, where it is fastened using a bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member having a spring constant value of 70 kgf/mm, and where the bracket is fastened to the body using bolts without a bracket insulating member having a spring constant value of 7 kgf/mm and the body insulating member.
FIG. 10 is a graph showing the relationship between vibration noise and operating frequency in the states where the “C” portion of FIG. 7 is fastened only with bolts, where it is fastened using a bracket insulating member having a spring constant value of 4 kgf/mm and a body insulating member having a spring constant value of 40 kgf/mm, where it is fastened using a bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member having a spring constant value of 70 kgf/mm, and where the bracket is fastened to the body using bolts without a bracket insulating member having a spring constant value of 7 kgf/mm and the body insulating member.
FIG. 11 is a graph showing the relationship between the operating frequency and the vibration noise in the following states: when the “A” portion of FIG. 7 is fastened with only bolts without the bracket insulating member and when a body insulating member having a spring constant value of 60 kgf/mm is used for fastening; when the bracket insulating member having a spring constant value of 3 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm are used for fastening; when the bracket insulating member having a spring constant value of 4 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm are used for fastening; when the bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm are used for fastening; and when the bracket insulating member having a spring constant value of 10 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm are used for fastening.
FIG. 12 is a graph showing the relationship between the operating frequency and the vibration noise in the following states: when the “B” portion of FIG. 7 is fastened with only bolts without the bracket insulating member and when a body insulating member having a spring constant value of 60 kgf/mm is used for fastening; when the bracket insulating member having a spring constant value of 3 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm are used for fastening; when the bracket insulating member having a spring constant value of 4 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm are used for fastening; when the bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm are used for fastening; and when the bracket insulating member having a spring constant value of 10 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm are used for fastening.
FIG. 13 is a graph showing the relationship between the operating frequency and the vibration noise in the states where the "C" portion of FIG. 7 is fastened only with bolts without the bracket insulating member and the body insulating member having a spring constant value of 60 kgf/mm is used for fastening, the state where the bracket insulating member having a spring constant value of 3 kgf/mm and the body insulating member having a spring constant value of 60 kgf/mm are used for fastening, the state where the bracket insulating member having a spring constant value of 4 kgf/mm and the body insulating member having a spring constant value of 60 kgf/mm are used for fastening, the state where the bracket insulating member having a spring constant value of 7 kgf/mm and the body insulating member having a spring constant value of 60 kgf/mm are used for fastening, and the state where the bracket insulating member having a spring constant value of 10 kgf/mm and the body insulating member having a spring constant value of 60 kgf/mm are used for fastening.
Figure 14 is a graph showing the relationship between vibration noise by frequency band when the electric compressor and the subframe are mounted by a bracket using only bolts instead of a body insulation member and a bracket insulation member having a different spring constant value.
Figure 15 is a graph showing the relationship between vibration noise and frequency when an electric compressor and a subframe are mounted on a bracket using a body insulating member having a spring constant value of 40 kgf/mm and a bracket insulating member having a different spring constant value.
Figure 16 is a graph showing the relationship between vibration noise by frequency band when an electric compressor and a subframe are mounted by a bracket using a body insulating member having a spring constant value of 60 kgf/mm and a bracket insulating member having a different spring constant value.
Figure 17 is a graph showing the relationship between vibration noise by frequency band when an electric compressor and a subframe are mounted by a bracket using a body insulating member having a spring constant value of 70 kgf/mm and a bracket insulating member having a different spring constant value.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the attached drawings. Prior to this, the terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, and should be interpreted as meanings and concepts that conform to the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his or her own invention in the best way.

The present invention improves the assembly stability of an electric compressor, which is a component mounted on an electric compressor mounting bracket, limits displacement of the electric compressor in the upward and downward directions, limits vibration occurrence due to the behavior of the electric compressor, and limits noise occurrence due to contact between metal members. The present invention will be described in more detail with reference to the drawings as follows.

Referring to FIGS. 1 to 6, an electric compressor mounting bracket (10) according to one embodiment of the present invention includes a bracket housing (100), a body insulating member (200), and a bracket insulating member (300).

The above bracket housing (100) is designed to be fixed to the electric compressor (1) and the body (2), and has a corresponding shape depending on the design conditions. Since the bracket housing (100) can have various shapes depending on the design conditions, it is not limited to a single shape and can be mounted not only on the body (2) but also on an engine, etc. It is preferable that the body (2) or the engine, etc. be provided with a subframe (3) for mounting the bracket housing (100).

The bracket housing (100) is formed with a plurality of first fixing holes (102) and a plurality of second fixing holes (104), respectively. The plurality of first fixing holes (102) and the plurality of second fixing holes (104) are formed at corresponding positions in the bracket housing (100) according to design conditions, and each of the first fixing holes (102) and the second fixing holes (104) are arranged adjacent to each other.

The above first fixing holes (102) and second fixing holes (104) can also be placed in various positions depending on design conditions, so they are not described in a limited manner to a single position.

And, a body insulation member (200) is coupled to the first fixing hole (102) of the bracket housing (100), and the body insulation member (200) has a natural frequency of the bracket housing (100) that can avoid resonance with a specific frequency generated from the body (2) and the electric compressor (1) while fixing the bracket housing (100) to the body.

By fixing the bracket housing (100) to the body (2) by the body insulation member (200), the natural frequency of the bracket housing (100) is separated from the operating frequency of the electric compressor (1), thereby preventing damage to the bracket housing (100) and the electric compressor (1) due to resonance.

Referring to FIGS. 3 and 4, the body insulation member (200) includes a first outer bush (210), a second insulation bush (220), a first guide bush (230), and a stopper plate (240). The first outer bush (210) is formed in a cylindrical shape with a hollow interior, and it is preferable that the outer diameter of the first outer bush (210) be the same size as the inner diameter of the first fixing hole (102) of the bracket housing (100) so that the first outer bush (210) does not fall out easily from the first fixing hole (102) after being coupled to the first fixing hole (102) of the bracket housing (100).

A first insulating bushing (220) is inserted into the hollow interior of the first outer bushing (210). The first insulating bushing (220) is also cylindrical and has a hollow interior. It is preferable that the material be rubber or synthetic resin so that it can insulate.

A plurality of catches (221) are formed at the top and bottom of the first insulating bush (220), respectively, and the plurality of catches (221) are arranged radially, and the first insulating bush (220) coupled to the hollow of the first outer bush (210) is coupled to the hollow of the first outer bush (210) by the plurality of catches (221) formed at the top and bottom, respectively.

A first guide bushing (230) is inserted into the hollow of the first insulating bushing (220), and a through hole (231), which is a bolt hole that penetrates the first guide bushing (230) upward and downward, is formed at the center of the first guide bushing (230) to guide a bolt to the through hole (231).

It is preferable that the above through hole (231) has a shape in which the plane is cut in a '+' shape centered on the first guide bush (230) so as to partially contact the outer surface of the bolt.

A stopper plate (240) is provided on the upper side of the first guide bush (230). The stopper plate (240) blocks contact between the head of a fastening bolt coupled to the body and the upper side of the first insulating bush (220), and prevents the body insulating member (200) from being detached from the bracket housing (100) by a support (electric compressor + bracket for mounting the electric compressor) having vibration in the up and down directions.

The above-described body insulation member (200) is coupled to the first fixing hole (102) of the bracket housing (100), thereby fixing the bracket housing (100) to the body (2) and insulating the body (2) and the bracket housing (100) from vibration, improving the assembly and mounting stability of the electric compressor (1), which is a component mounted on the bracket for mounting the electric compressor (10), limiting noise generation due to contact between the electric compressor (1), which is a metal member, and the bracket housing (100), and preventing vibration that may be generated by a support structure (electric compressor + bracket for mounting the electric compressor) having an amplitude in the vertical direction.

Referring to FIGS. 1 and 2, a bracket insulating member (300) is attached to the second fixing hole (104) of the bracket housing (100), and the bracket insulating member (300) secures the electric compressor (1) to the bracket housing (100) while insulating it from vibration.

Referring to FIGS. 5 and 6, the bracket insulating member (300) is examined in more detail. The bracket insulating member (300) includes a second outer bushing (310), a second insulating bushing (320), a second guide bushing (330), a caulking bolt (340), and a displacement limiting washer (350).

The second outer bushing (310) is formed in a cylindrical shape with a hollow interior, and the outer diameter of the second outer bushing (310) is preferably formed to be the same size as the inner diameter of the second fixing hole (104) of the bracket housing (100), so that the second outer bushing (310) is preferably prevented from being easily removed from the second fixing hole (104) after being coupled to the second fixing hole (104) of the bracket housing (100).

The second outer bushing (310) further forms a displacement limiting flange (311) that is bent in the outer direction along the outer periphery of the upper side thereof to limit displacement for downward movement. When the displacement is limited, stable support for the load is possible, and the bush covering it has the effect of limiting noise generation due to contact between metal members.

A second insulating bushing (320) having a structure that covers the upper outer periphery of the second outer bushing (310) is inserted into the hollow interior of the second outer bushing (310). The second insulating bushing (320) is also cylindrical, has a hollow interior, and is made of rubber or synthetic resin material for insulation. In order to prevent noise generated by contact between the electric compressor (10) and the second outer bushing (310), a noise prevention piece (321) is formed by bending it in the outer periphery along the outer periphery.

A second guide bushing (330) is inserted into the hollow of the second insulating bushing (320). The second guide bushing (330) has a bolt hole formed in its center that penetrates upward and downward, and guides a caulking bolt (340) to the through hole (331).

The above-mentioned cocking bolt (340) is inserted from the lower side to the upper side of the through hole (331) of the second guide bushing (330), and the electric compressor (10) is fixed to the bracket housing (100) by fastening with a nut.

At this time, a displacement limiting washer (350) is attached to the head of the cocking bolt (340), and the displacement limiting washer (350) limits the displacement for upward movement together with the displacement limiting flange (311).

Here, the displacement limiting washer (350) combines a hard inner washer member (351) and an outer washer member (352) made of soft rubber or synthetic resin on the outside, so that the displacement for upward movement is limited by the inner washer member (351), and noise generated by contact between metal members is prevented by the outer washer member (352).

The above-mentioned body insulation member (200) and the above-mentioned bracket insulation member (300) have different spring constant values. It is preferable that the spring constant value of the above-mentioned body insulation member (200) has a range of 40 to 80 kgf/mm, and it is preferable that the spring constant value of the above-mentioned bracket insulation member (300) has a range of 3 to 7 kgf/mm.

Referring to Fig. 7, the electric compressor (1) and the subframe (3) provided on the body (2) are mounted by the electric compressor mounting bracket (10). The results of vibration noise according to the operating frequency band in the following cases: the state where the "A" portion, the "B" portion, and the "C" portion of Fig. 7 are each fastened only with bolts; the state where they are fastened using a bracket insulating member having a spring constant value of 4 kgf/mm and a body insulating member having a spring constant value of 40 kgf/mm; the state where they are fastened using a bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member having a spring constant value of 70 kgf/mm; and the state where the bracket is fastened to the body using bolts without the bracket insulating member having a spring constant value of 7 kgf/mm and the body insulating member, are as shown in Figs. 8 to 10.

Referring to FIGS. 8 to 10, the graphs showing the relationship between vibration noise by operating frequency in the following cases: (a) when all parts are fastened using only bolts, (b) when fastened using a bracket insulating member having a spring constant value of 4 kgf/mm and a body insulating member having a spring constant value of 40 kgf/mm, (c) when fastened using a bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member having a spring constant value of 70 kgf/mm, and (d) when the bracket is fastened to the body using bolts without a bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member, it can be confirmed that the vibration noise decreases in the order of (a), (d), (c), and (b) when the frequency is 2000.

Referring to FIGS. 11 to 13, the "A" portion, the "B" portion, and the "C" portion of FIG. 7 are respectively (a) fastened using only bolts instead of a bracket insulating member and a body insulating member having a spring constant value of 60 kgf/mm, (b) fastened using a bracket insulating member having a spring constant value of 3 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm, (c) fastened using a bracket insulating member having a spring constant value of 4 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm, (d) fastened using a bracket insulating member having a spring constant value of 7 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm, and (e) fastened using a bracket insulating member having a spring constant value of 10 kgf/mm and a body insulating member having a spring constant value of 60 kgf/mm. When examining the relationship between the operating frequency and vibration noise in the state of being connected using the method, it can be confirmed that when the frequency is 2000, the vibration noise decreases in the order of (e), (d), (a), (b), (c) in the "A" section, in the order of (a), (e), (d), (b), (c) in the "B" section, and in the order of (a), (e), (d), (c), (b) in the "C" section.

Fig. 14 is a graph showing the relationship between vibration noise according to frequency when the electric compressor and the subframe are mounted by the bracket using a bracket insulating member having a spring constant value different from that of the bolt instead of the body insulating member. Referring to Fig. 14, when the spring constant values of the bolt and the bracket insulating member (300) instead of the body insulating member (200) are by type (direct connection, 3 kgf, 4 kgf, 7 kgf, 10 kgf), it can be confirmed that the bracket insulating member (300) having spring constant values of 3 kgf/mm, 4 kgf/mm, and 7 kgf/mm not only in the operating frequency of the electric compressor (1) of 0 to 200 Hz but also in the entire frequency band exhibited lower vibration noise (dB) than the specifications of 10 kgf/mm and the bracket insulating member (300) in which the bolt is directly connected instead of the bracket insulating member.

Fig. 15 is a graph showing the relationship between vibration noise according to frequency when an electric compressor and a subframe are mounted by a bracket using a body insulating member having a spring constant value of 40 kgf/mm and a bracket insulating member having different spring constant values. Referring to Fig. 15, it can be confirmed that when the spring constant values of the body insulating member (200) having a spring constant value of 40 kgf/mm and the bracket insulating member (300) are compared by type (direct connection, 3 kgf, 4 kgf, 7 kgf, 10 kgf) for the operating frequency of the electric compressor (1) in the range of 0 to 200 Hz, as well as in the entire frequency band, the bracket insulating member (300) having spring constant values of 3 kgf/mm, 4 kgf/mm, and 7 kgf/mm exhibited lower vibration noise (dB) than the specification of 10 kgf/mm and the specification in which bolts are directly connected.

Fig. 16 is a graph showing the relationship between vibration noise according to frequency when an electric compressor and a subframe are mounted by a bracket using a body insulating member having a spring constant value of 60 kgf/mm and a bracket insulating member having different spring constant values. Referring to Fig. 16, it can be confirmed that when the spring constant values of the body insulating member (200) having a spring constant value of 60 kgf/mm and the bracket insulating member (300) are compared by type (direct connection, 3 kgf, 4 kgf, 7 kgf, 10 kgf) for the operating frequency of the electric compressor (1) in the range of 0 to 200 Hz, as well as in the entire frequency band, the bracket insulating member (300) having spring constant values of 3 kgf/mm, 4 kgf/mm, and 7 kgf/mm exhibited lower vibration noise (dB) than the specification of 10 kgf/mm and the specification in which bolts are directly connected.

Fig. 17 is a graph showing the relationship between vibration noise according to frequency when an electric compressor and a subframe are mounted by a bracket using a body insulating member having a spring constant value of 70 kgf/mm and a bracket insulating member having different spring constant values. Referring to Fig. 17, it can be confirmed that when the spring constant values of the body insulating member (200) having a spring constant value of 70 kgf/mm and the bracket insulating member (300) are compared by type (direct connection, 3 kgf, 4 kgf, 7 kgf, 10 kgf) for the operating frequency of the electric compressor (1) in the range of 0 to 200 Hz, as well as in the entire frequency band, the bracket insulating member (300) having spring constant values of 3 kgf/mm, 4 kgf/mm, and 7 kgf/mm exhibited lower vibration noise (dB) than the specification of 10 kgf/mm and the specification in which bolts are directly connected.

When the electric compressor and the subframe are mounted by the bracket using bracket insulating members having different spring constant values, the natural frequencies according to the stiffness of the bracket insulating members at the "A", "B", and "C" portions of Fig. 7 are as shown in Fig. 18.

Referring to Fig. 18, considering that the operating rpm of the electric compressor (1) is 600 to 10,000 rpm, the frequency range of the operating range is 10 Hz to 167 Hz, and the natural frequency of the compressor bracket to avoid resonance between the subframe (3) and the electric compressor (1) must exceed 200 Hz.

When assembling the above bracket and subframe (3), bolt assembly rather than body insulation member (200) is most advantageous for frequency avoidance, but is disadvantageous in vibration heat transfer, and when installing the body insulation member (200), a higher spring constant k value is advantageous. Therefore, in order to maximize the vibration insulation effect of the electric compressor and the resonance frequency avoidance effect of the subframe, it is preferable that the spring constant values of the bracket insulation member (300) and the body insulation member (200) have a range of 3 to 7 kgf/mm and 40 to 80 kgf/mm, respectively.

Accordingly, by using a bracket insulating member (300) having a range of 3 to 7 kgf/mm and a body insulating member (200) having a range of 40 to 80 kgf/mm to secure the electric compressor (1) and the bracket housing (100) to the bracket housing (100) and the subframe (3) of the body (2), respectively, vibration isolation and avoidance of resonant frequency by natural frequency separation can be achieved simultaneously.

Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the appended claims.

1: Electric compressor 2: Body
10: Bracket for mounting electric compressor 100: Bracket housing
102: 1st fixed hole 104: 2nd fixed hole
200: Body insulation member 210: First outer bushing
220: 1st insulating bush 230: 1st guide bush
240: Stopper plate 300: Bracket insulation material
310: Second outer bushing 311: Displacement limiting flange
320: 2nd insulation bushing 321: Noise prevention section
330: 2nd guide bushing 340: cocking bolt
350: Displacement limiting washer 351: Inner washer member
352: Outer washer member

Claims (8)

delete delete A bracket housing having a plurality of first fixing holes and a plurality of second fixing holes formed;
A body insulation member that is coupled to the first fixing hole of the bracket housing and avoids resonant frequency while fixing the bracket housing to the body; and
A bracket insulation member is coupled to the second fixing hole of the bracket housing and includes a bracket insulation member that fixes the electric compressor to the bracket housing while insulating it from vibration.
The above body insulation member and the above bracket insulation member have different spring constant values.
The above body insulation material is,
A first outer bushing having a hollow cylindrical shape,
It includes a first insulating bushing inserted into the hollow interior of the first outer bushing and forming a hollow interior,
A bracket for mounting an electric compressor, characterized in that a plurality of catches are formed at the upper and lower ends of the first insulating bushing, and the plurality of catches are arranged radially at the upper and lower ends of the first insulating bushing.
delete delete delete A bracket housing having a plurality of first fixing holes and a plurality of second fixing holes formed;
A body insulation member that is coupled to the first fixing hole of the bracket housing and avoids resonant frequency while fixing the bracket housing to the body; and
A bracket insulation member is coupled to the second fixing hole of the bracket housing and includes a bracket insulation member that fixes the electric compressor to the bracket housing while insulating it from vibration.
The above body insulation member and the above bracket insulation member have different spring constant values.
The above bracket insulation member is configured to include a second outer bushing, a second insulation bushing inserted into the hollow interior of the second outer bushing, a second guide bushing inserted into the hollow interior of the second insulation bushing, a caulking bolt inserted from the lower side to the upper side into the through hole of the second guide bushing, and a displacement limiting washer coupled to the head of the caulking bolt.
The above displacement limiting washer is,
A solid, hard inner washer member,
A bracket for mounting an electric compressor including an outer washer member made of soft rubber or synthetic resin.
delete

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