A compression-shear combined engine rubber vibration isolator

Abstract

The present application belongs to the technical field of vibration isolation installation of aerospace power plants, and particularly relates to a compression-shear combined engine rubber vibration isolator. The elastic module is assembled on a mounting base by combining a plurality of independent rubber blocks, and is arranged in a front-to-back and left-to-right symmetrical manner. The large compression stiffness of the rubber element is used to transmit the engine heading load, and the low shear stiffness of the elastic element is used to transmit the engine lateral load and vertical load, and the vibration in the rotation plane of the engine can be effectively isolated. The compression-shear composite load-bearing form can meet the vibration isolation and load transmission requirements in different directions. In the present application, the four elastic rubber elements are distributed front-to-back and left-to-right symmetrically along the installation axis, and have good stability. Compared with the use of integral rubber blocks, this structural form of multiple rubber blocks in parallel is conducive to the heat dissipation of the molecules inside the rubber structure, and can avoid the transmission of damage cracks between rubber blocks, which is conducive to improving service life and reliability.

Description

Technical Field

[0001] The present application belongs to the technical field of vibration isolation installation of aerospace power plants, and in particular relates to a compression-shear combined engine rubber vibration isolator. Background Art

[0002] The vibration generated by the operation of turboprop aircraft engines will have a great impact on the vibration environment of the entire aircraft and the ride comfort. The transmission of its vibration to the aircraft can be effectively suppressed by the engine vibration isolation installation system. The vibration isolation system composed of multiple rubber vibration isolation devices has a three-dimensional six-degree-of-freedom vibration characteristic. At the same time, the loads in all directions at the engine joint are quite different. Especially at the main installation section of the engine, the heading load is larger than that in other directions. Therefore, the vibration isolation device here should have three-dimensional anisotropic stiffness characteristics. The anisotropic load-bearing of this compression-shear combination meets the load transmission requirements and vibration isolation performance requirements of the installation system. At the same time, because the aircraft engine installation joint has a high damage tolerance and breakage safety requirements, the present invention adopts a shaft sleeve matching form, which can still ensure the reliable connection of the structure after the rubber parts are damaged or destroyed.

[0003] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0004] The purpose of the present application is to provide a compression-shearing combined engine rubber vibration isolator to solve at least one problem existing in the prior art.

[0005] The technical solution of this application is:

[0006] A compression-shearing combined engine rubber vibration isolator, comprising:

[0007] A front elastic component, the front elastic component comprises a front cover plate, a first through hole is opened in the center of the front cover plate, a rubber block is symmetrically installed on the rear side of the front cover plate, a mounting plate is installed on the rear side of the rubber block, and a U-shaped boss is arranged on the rear side of the mounting plate;

[0008] A rear elastic component, the rear elastic component comprising a rear cover plate, a second through hole is opened in the center of the rear cover plate, a rubber block is symmetrically installed on the front side of the rear cover plate, a mounting plate is installed on the front side of the rubber block, and a U-shaped boss is arranged on the front side of the mounting plate;

[0009] A mounting base, the mounting base is arranged between the front elastic component and the rear elastic component, the mounting base includes a base and a connecting boss, the base and the connecting boss are perpendicular to each other, a third through hole is opened at the center of the connecting boss, and a fourth through hole is opened symmetrically on the left and right of the third through hole, the front side of the connecting boss is matched and connected with the U-shaped boss of the mounting plate of the front elastic component through the fourth through hole, and the rear side is matched and connected with the U-shaped boss of the mounting plate of the rear elastic component through the fourth through hole;

[0010] A mounting sleeve, wherein the mounting sleeve is provided with a front boss and a rear boss, the mounting sleeve is mounted in the first through hole, the second through hole and the third through hole from the front side, and is connected with the front elastic component through the front boss, and is connected with the rear elastic component through the rear boss;

[0011] A connecting screw rod is fixed by a nut after passing through the mounting sleeve from the front side.

[0012] In at least one embodiment of the present application,

[0013] The rubber block in the front elastic component is vulcanized with the mounting plate and the front cover plate using an adhesive;

[0014] The rubber block in the rear elastic component is vulcanized with the mounting plate and the rear cover plate using an adhesive.

[0015] In at least one embodiment of the present application, the first through hole in the center of the front cover plate is a stepped hole, the front side of the front cover plate is an inclined surface provided with four rectangular grooves symmetrically distributed on the left and right and a plane with two rectangular grooves symmetrically distributed on the top and bottom, and the rear side of the front cover plate is a plane.

[0016] In at least one embodiment of the present application, a sleeve connecting boss extending rearward is provided at the center of the rear cover plate, the sleeve connecting boss is provided with the second through hole, a ⊥-shaped sleeve is installed in the second through hole from the rear side, the rear side of the rear cover plate is provided with inclined surfaces symmetrically distributed on the left and right, and the front side of the rear cover plate is a plane.

[0017] In at least one embodiment of the present application, an annular boss is provided at the center of the base, a fifth through hole is symmetrically provided on the front side of the base, and a U-shaped hole is symmetrically provided on the rear side of the base;

[0018] When the compression-shear combined engine rubber vibration isolator is actually used, the annular boss is matched and connected with the circular groove on the main mounting surface of the engine, and the fifth through hole and the U-shaped hole are matched and connected with the mounting holes on the main mounting surface of the engine through bolts.

[0019] In at least one embodiment of the present application, weight-reducing grooves are symmetrically provided on the base.

[0020] In at least one embodiment of the present application, the third through hole of the connecting boss is a rectangular through hole, and a size of the third through hole is larger than an outer diameter of the mounting sleeve located at the third through hole.

[0021] In at least one embodiment of the present application, two fourth through holes are opened on the left side of the third through hole of the connecting boss, and two fourth through holes are opened on the right side of the third through hole of the connecting boss.

[0022] In at least one embodiment of the present application, the outer diameter of the front boss of the mounting sleeve is smaller than the outer diameter of the rear boss, and after the mounting sleeve is assembled, there is a predetermined distance between the rear boss and the front side plane of the rear cover plate.

[0023] In at least one embodiment of the present application, the front portion of the connecting screw is a bare rod section, and the rear portion is a threaded section, which cooperates with the nut to encapsulate the entire compression-shear combination engine rubber vibration isolator. When the compression-shear combination engine rubber vibration isolator is actually used, the nut is removed and connected to the main mounting joint of the engine mount through the mounting sleeve.

[0024] The invention has at least the following beneficial technical effects:

[0025] The compression-shear combined engine rubber vibration isolator of the present application can not only meet the requirements of failure protection, but also utilize the larger compression stiffness of the rubber element to transfer the engine heading load, utilize the lower shear stiffness of the rubber element to transfer the engine lateral load and vertical load, and can also effectively isolate the vibration within the engine rotation plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall schematic diagram of a compression-shear combined engine rubber vibration isolator according to an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of a compression-shear combined engine rubber vibration isolator after removing the rear elastic component according to one embodiment of the present application;

[0028] Figure 3 is a cross-sectional view of a compression-shear combined engine rubber vibration isolator according to an embodiment of the present application;

[0029] Figure 4 is a schematic diagram of a front elastic component of one embodiment of the present application;

[0030] Figure 5 Schematic diagram of a rear elastic component according to one embodiment of the present application.

[0031] in:

[0032] 1-mounting base, 2-mounting plate, 3-front cover, 4-rubber block, 5-rear cover, 6-⊥-shaped sleeve, 7-mounting sleeve, 8-nut, 9-connecting screw, 10-annular boss, 11-fifth through hole, 12-U-shaped hole, 13-base, 14-connecting boss, 15-weight-reducing groove, 16-fourth through hole, 17-U-shaped boss, 18-rear boss, 19-circular hole, 20-front boss, 21-circular boss, 22-front elastic component, 23-rear elastic component. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0035] The following is combined with Figures 1 to 5 This application is described in further detail.

[0036] The present application provides a compression-shear combined engine rubber vibration isolator, comprising: a front elastic component 22, a rear elastic component 23, a mounting base 1, a mounting sleeve 7 and a connecting screw 9.

[0037] Specifically, Figure 1 As shown, one side of the front cover plate 3 is used as the front side, one side of the rear cover plate 5 is used as the rear side, and one side of the base 13 of the mounting base 1 is used as the bottom.

[0038] Among them, the front elastic component 22 includes a front cover plate 3, two rubber blocks 4 and two mounting plates 2, a first through hole is opened in the center of the front cover plate 3, and two rubber blocks 4 are symmetrically installed on the rear side of the front cover plate 3, and the mounting plates 2 are respectively installed on the rear sides of the two rubber blocks 4, and the rear sides of the mounting plates 2 are provided with U-shaped bosses 17; the rear elastic component 23 includes a rear cover plate 5, two rubber blocks 4 and two mounting plates 2, a second through hole is opened in the center of the rear cover plate 5, and two rubber blocks 4 are symmetrically installed on the front side of the rear cover plate 5, and the mounting plates 2 are respectively installed on the front sides of the two rubber blocks 4, and the front sides of the mounting plates 2 are provided with U-shaped bosses 17. The mounting base 1 is arranged between the front elastic component 22 and the rear elastic component 23, and the mounting base 1 includes a base 13 and a connecting boss 14, the base 13 and the connecting boss 14 are perpendicular to each other, a third through hole is opened at the center of the connecting boss 14, and a fourth through hole 16 is opened symmetrically on the left and right of the third through hole, the front side of the connecting boss 14 is matched and connected with the U-shaped boss 17 of the mounting plate 2 of the front elastic component 22 through the fourth through hole 16, and the rear side is matched and connected with the U-shaped boss 17 of the mounting plate 2 of the rear elastic component 23 through the fourth through hole 16;

[0039] Furthermore, a front boss 20 and a rear boss 18 are provided on the mounting sleeve 7. The mounting sleeve 7 is installed in the first through hole, the second through hole and the third through hole from the front side, and is connected with the front elastic component 22 through the front boss 20, and is connected with the rear elastic component 23 through the rear boss 18; the connecting screw 9 passes through the mounting sleeve 7 from the front side and is fixed by the nut 8.

[0040] In the preferred embodiment of the present application, the rubber block 4 in the front elastic component 22 is vulcanized with the mounting plate 2 and the front cover plate 3 using a special adhesive; the rubber block 4 in the rear elastic component 23 is vulcanized with the mounting plate 2 and the rear cover plate 5 using a special adhesive. The rubber block 4 is a rectangular block made of a high-temperature resistant and high-damping rubber material by compression molding and vulcanization under certain process conditions, and can maintain good mechanical properties within a temperature range of -50°C to 100°C.

[0041] In a preferred embodiment of the present application, Figure 4 As shown, the first through hole in the center of the front cover plate 3 is a stepped hole, the front side of the front cover plate 3 is an inclined surface provided with four rectangular grooves symmetrically distributed left and right and a plane with two rectangular grooves symmetrically distributed up and down, and the rear side of the front cover plate 3 is a plane. In this embodiment, the total thickness of the center position of the front cover plate 3 is 15mm, the front section diameter of the first through hole is 16mm, the rear section diameter is 30mm, and the thicknesses are 7.4mm and 7.6mm respectively, to meet the installation requirements of the connecting screw 9 and the mounting sleeve 7.

[0042] In a preferred embodiment of the present application, Figure 5As shown, the center of the rear cover plate 5 is provided with a sleeve connection boss extending to the rear side, and the sleeve connection boss is provided with a second through hole, in which a ⊥-shaped sleeve 6 is installed from the rear side, and the center of the ⊥-shaped sleeve 6 has a circular hole 19, and the rear side of the rear cover plate 5 is provided with inclined surfaces symmetrically distributed on the left and right, and the front side of the rear cover plate 5 is a plane. In this embodiment, the outer diameter of the sleeve connection boss is 50mm, and the diameter of the second through hole is 42mm, which is used to match the ⊥-shaped sleeve 6; the ⊥-shaped sleeve 6 has a boss with an outer diameter of 42mm, and a through hole with a diameter of 35mm is provided at the center position to meet the installation requirements of the installation sleeve 7 and the connecting screw 9. After installation, the end face of the installation sleeve 7 is about 73mm higher than the end face of the ⊥-shaped sleeve 6, and is used to connect with the engine mounting frame.

[0043] In the preferred embodiment of the present application, the base 13 of the mounting base 1 and the connecting boss 14 are perpendicular to each other, forming a ⊥-shaped structure. An annular boss 10 is arranged at the center of the base 13, and two circular fifth through holes 11 are symmetrically provided on the front side of the base 13, and a U-shaped hole 12 is symmetrically provided on the rear side of the base 13; in this embodiment, the outer diameter of the annular boss 10 is 80 mm, and the annular boss 10 and the base 13 are respectively provided with holes with an inner diameter of 62 mm and an inner diameter of 56 mm, which together form a stepped hole. When the compression-shear combined engine rubber isolator is actually used, the annular boss 10 is connected with the circular groove on the main mounting surface of the engine, and the fifth through hole 11 and the U-shaped hole 12 are connected with the mounting holes on the main mounting surface of the engine by bolts. Among them, the annular boss 10 is tightly matched with the circular groove on the main mounting surface of the engine, and each through hole is matched with the bolt clearance to ensure that the shear load and the tensile load are borne by different components.

[0044] Advantageously, in this embodiment, a weight-reducing groove 15 is symmetrically provided at the bottom of the base 13. The weight-reducing groove 15 is a rectangular groove structure with a length of 33 mm, a width of 19 mm, and a height of 31 mm, and is used to reduce the weight of the mounting base 1 and the entire vibration isolation device.

[0045] In the compression-shearing combined engine rubber isolator of the present application, the third through hole of the connecting boss 14 is a rectangular through hole, and the size of the third through hole is larger than the outer diameter of the mounting sleeve 7 located at the third through hole. In this embodiment, the third through hole of the connecting boss 14 is a rectangular through hole with a side length of 46 mm and a width of 51 mm opened along the center line. After assembly, the connecting screw 9 and the mounting sleeve 7 pass through the rectangular through hole, and the diameters of both are smaller than the cross-sectional size of the rectangular through hole to meet the vibration displacement requirements of the vibration isolation device. Two fourth through holes 16 are opened on the left side of the third through hole of the connecting boss 14, and two fourth through holes 16 are opened on the right side of the third through hole of the connecting boss 14. In this embodiment, the fourth through hole 16 includes a rectangular through hole with a length of 52 mm and a width of 24 mm, and a rectangular through hole with a length of 52 mm and a width of 34 mm. Two U-shaped bosses 17 are arranged on each mounting plate 2, and the openings of the two U-shaped bosses 17 are arranged opposite to each other. The fourth through hole cooperates with the U-shaped boss 17 on the mounting plate 2 to fix the mounting plate 2 and the front and rear elastic components. The coordination form of the boss and the rectangular hole can effectively improve the reliability of the connection between the elastic component and the mounting base 1.

[0046] In the compression-shearing combined engine rubber vibration isolator of the present application, the front boss 20 and the rear boss 18 of the mounting sleeve 7 have different outer diameters, and the outer diameter of the front boss 20 is smaller than the outer diameter of the rear boss 18. After the mounting sleeve 7 is assembled, there is a predetermined distance between the rear boss 18 and the front plane of the rear cover plate 5 to ensure the compression amount of the vibration isolator under load. Advantageously, in this embodiment, the through hole at the center of the mounting sleeve 7 is also set in a stepped hole, wherein the aperture of the front half is larger than the aperture of the rear half, and the aperture of the rear half is adapted to the connecting screw 9, which is convenient for assembly and can also achieve the effect of weight reduction.

[0047] Furthermore, in a preferred embodiment of the present application, the front portion of the connecting screw 9 is a bare rod section, and the rear portion has a threaded section of a certain length, which can cooperate with the nut 8 to encapsulate the overall compression-shear combination engine rubber vibration isolator. When the compression-shear combination engine rubber vibration isolator is actually used, after the nut 8 is removed, it is connected to the main mounting joint of the engine frame through the mounting sleeve 7, and finally the preload force is controlled according to certain requirements using a force measuring wrench.

[0048] The specific assembly steps of the compression-shear combined engine rubber vibration isolator of the present application are as follows:

[0049] 1. Connect the mounting plate 2 in the front elastic component 22 to the front side of the connecting boss 14 of the mounting base 1 through the U-shaped boss 17 and the rectangular through-hole structure;

[0050] 2. Pass the installation sleeve 7 through the third through hole on the connecting boss 14 of the installation base 1 and install it on the front cover 3. The front end of the installation sleeve 7 has a smaller diameter cylindrical section that matches the first through hole in the center of the front cover 3. Pass the larger diameter cylindrical section of the installation sleeve 7 through the ⊥-shaped sleeve 6 that matches the rear cover 5.

[0051] 3. The mounting plate 2 in the rear elastic component 23 is matched with the rear side of the connecting boss 14 of the mounting base 1 through the U-shaped boss and the rectangular through-hole structure. The rear end surface of the mounting sleeve 7 is about 73 mm higher than the end surface of the ⊥-shaped sleeve 6 for connection with the engine mounting frame;

[0052] 4. Pass the connecting screw 9 through the first through hole of the front cover 3, the third through hole of the connecting boss 14 of the mounting base 1, and the center hole of the ⊥-shaped sleeve 6 matched with the rear cover 5 from front to back. The rear end of the connecting screw 9 is about 20 mm higher than the ⊥-shaped sleeve 6.

[0053] 5. Screw the nut 8 onto the connecting screw 9 until the nut 8 is flush with the mounting sleeve 7, and the assembly is complete.

[0054] The compression-shear combined engine rubber vibration isolator of the present application, the elastic module is composed of a plurality of independent rubber blocks 4 assembled on the mounting base 1, adopts a front-to-back and left-to-right symmetrical arrangement, utilizes the large compression stiffness of the rubber element to transmit the engine heading load, utilizes the low shear stiffness of the elastic element to transmit the engine lateral load and vertical load, and can effectively isolate the vibration in the engine rotation plane, and adopts a compression-shear composite load-bearing form, which can meet the vibration isolation and load transmission requirements in different directions. In the present application, the four elastic rubber elements are distributed front-to-back and left-to-right symmetrically along the installation axis direction, and have good stability. Compared with the use of an integral rubber block, this structural form of multiple rubber blocks in parallel is conducive to the heat dissipation of the molecules inside the rubber structure, and can avoid the transmission of damage cracks between rubber blocks, which is conducive to improving the service life and reliability. The overall structure of the present application adopts the layout form of a mounting base 1 plus an elastic component, which enhances the replaceability and maintainability of the vibration isolation element; the rubber element is made of a high-low temperature resistant and high-damping rubber material, which has good vibration reduction performance and high-low temperature resistance, and is particularly suitable for installation environments with high working temperatures such as aircraft engines. At the same time, the mounting base 1 is provided with a plurality of hole structures and groove structures to meet the positioning requirements for the installation of rubber components. At the same time, the structural topology optimization is adopted to reduce the structural weight to meet the requirements for lightweight aviation products. It is a highly reliable engine main mounting section rubber vibration isolation device.

[0055] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A compression-shear combined engine rubber vibration isolator, characterized in that: include: A front elastic component (22), the front elastic component (22) comprising a front cover plate (3), a first through hole being provided at the center of the front cover plate (3), a rubber block (4) being symmetrically mounted on the rear side of the front cover plate (3), a mounting plate (2) being mounted on the rear side of the rubber block (4), and a U-shaped boss (17) being provided on the rear side of the mounting plate (2); A rear elastic component (23), the rear elastic component (23) comprising a rear cover plate (5), a second through hole being provided at the center of the rear cover plate (5), a rubber block (4) being symmetrically mounted on the front side of the rear cover plate (5), a mounting plate (2) being mounted on the front side of the rubber block (4), and a U-shaped boss (17) being provided on the front side of the mounting plate (2); A mounting base (1), the mounting base (1) being arranged between the front elastic component (22) and the rear elastic component (23), the mounting base (1) comprising a base (13) and a connecting boss (14), the base (13) and the connecting boss (14) being perpendicular to each other, a third through hole being provided at the center of the connecting boss (14), a fourth through hole (16) being provided symmetrically on the left and right of the third through hole, the front side of the connecting boss (14) being connected in cooperation with the U-shaped boss (17) of the mounting plate (2) of the front elastic component (22) through the fourth through hole (16), and the rear side of the connecting boss (14) being connected in cooperation with the U-shaped boss (17) of the mounting plate (2) of the rear elastic component (23) through the fourth through hole (16); A mounting sleeve (7), wherein the mounting sleeve (7) is provided with a front boss (20) and a rear boss (18), wherein the mounting sleeve (7) is mounted in the first through hole, the second through hole and the third through hole from the front side, and is connected with the front elastic component (22) through the front boss (20), and is connected with the rear elastic component (23) through the rear boss (18); A connecting screw (9) is passed through the mounting sleeve (7) from the front side and is fixed by a nut (8).

2. The compression-shear combined engine rubber vibration isolator according to claim 1, characterized in that: The rubber block (4) in the front elastic component (22) is vulcanized with an adhesive to form the mounting plate (2) and the front cover plate (3); The rubber block (4) in the rear elastic component (23) is vulcanized with an adhesive to form the mounting plate (2) and the rear cover plate (5).

3. The compression-shear combined engine rubber vibration isolator according to claim 2, characterized in that: The first through hole in the center of the front cover plate (3) is a stepped hole, the front side of the front cover plate (3) is an inclined surface provided with four rectangular grooves symmetrically distributed left and right and a plane with two rectangular grooves symmetrically distributed up and down, and the rear side of the front cover plate (3) is a plane.

4. The compression-shear combined engine rubber vibration isolator according to claim 3, characterized in that: A sleeve connection boss extending rearward is arranged at the center of the rear cover plate (5), the sleeve connection boss is provided with the second through hole, a ⊥-shaped sleeve (6) is installed in the second through hole from the rear side, the rear side of the rear cover plate (5) is provided with inclined surfaces symmetrically distributed on the left and right, and the front side of the rear cover plate (5) is a plane.

5. The compression-shear combined engine rubber vibration isolator according to claim 4, characterized in that: The center of the base (13) is provided with an annular boss (10), the front side of the base (13) is symmetrically provided with a fifth through hole (11), and the rear side of the base (13) is symmetrically provided with a U-shaped hole (12); When the compression-shearing combined engine rubber vibration isolator is actually used, the annular boss (10) is connected in cooperation with the circular groove on the main mounting surface of the engine, and the fifth through hole (11) and the U-shaped hole (12) are connected in cooperation with the mounting holes on the main mounting surface of the engine via bolts.

6. The compression-shear combined engine rubber vibration isolator according to claim 5, characterized in that: The base (13) is provided with weight-reducing grooves (15) symmetrically on the left and right sides.

7. The compression-shear combined engine rubber vibration isolator according to claim 6, characterized in that: The third through hole of the connecting boss (14) is a rectangular through hole, and the size of the third through hole is larger than the outer diameter of the mounting sleeve (7) located at the third through hole.

8. The compression-shear combined engine rubber vibration isolator according to claim 7, characterized in that: Two fourth through holes (16) are provided on the left side of the third through hole of the connecting boss (14), and two fourth through holes (16) are provided on the right side of the third through hole of the connecting boss (14).

9. The compression-shear combined engine rubber vibration isolator according to claim 8, characterized in that: The outer diameter of the front boss (20) of the mounting sleeve (7) is smaller than the outer diameter of the rear boss (18); after the mounting sleeve (7) is assembled, a predetermined distance exists between the rear boss (18) and the front plane of the rear cover plate (5).

10. The compression-shear combined engine rubber vibration isolator according to claim 9, characterized in that: The front part of the connecting screw rod (9) is a bare rod section, and the rear part is a threaded section, which cooperates with the nut (8) to encapsulate the entire press-shear combined engine rubber vibration isolator. When the press-shear combined engine rubber vibration isolator is actually used, the nut (8) is removed and connected to the main mounting joint of the engine frame through the mounting sleeve (7).

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