A quadrilateral structure engine auxiliary support point mounting device

Abstract

The present invention relates to the field of engine ground testing technology, addressing the issues of inconvenient installation of rear auxiliary fulcrums, limited centering margins, and thermal compensation during ground testing of aviation turboshaft engines. Specifically, the invention provides a quadrilateral-structured engine auxiliary fulcrum mounting device, comprising a mounting frame base, a cross-arm mechanism disposed on the upper side of the mounting frame base, and two sets of symmetrically arranged vertical adjustment arm mechanisms disposed on the cross-arm mechanism. By providing two sets of vertical adjustment arm mechanisms and a cross-arm mechanism, the present invention effectively limits the five degrees of freedom of the engine auxiliary mounting fulcrum. By rotating an adjustment screw to change the distance between the upper and lower spherical bearings, the height of the engine auxiliary mounting fulcrum can be adjusted, cooperating with the engine's front main fulcrum to complete centering, thereby improving the engine's centering accuracy. Furthermore, the upper and lower spherical bearings themselves possess a certain degree of rotational freedom, which can compensate for the engine's radial thermal expansion.

Description

Technical Field

[0001] The present invention relates to the technical field of engine ground testing, and in particular to an auxiliary fulcrum mounting device for an engine with a quadrilateral structure. Background Art

[0002] When an aviation turboshaft engine is tested on the ground, it needs to be installed on a matching engine mounting bracket. The engine mounting points are divided into front main mounting points and rear auxiliary mounting points. The rear auxiliary mounting points are distributed on the outside of the engine combustion chamber casing, and there are 6 axially distributed points.

[0003] An auxiliary fulcrum installation device is required to connect the engine mounting frame and the engine auxiliary fulcrum to fix the engine to the mounting frame; the output shaft speed of the aviation turboshaft engine is relatively high, so the turboshaft engine needs to adjust the coaxiality of its output shaft and the input shaft of the power absorption device during the test bench test, and the centering accuracy is relatively high, generally not higher than 0.05mm; therefore, not only is the engine's front main fulcrum installation mechanism required to have a centering function, but its rear auxiliary fulcrum should also have a certain centering function, and the front and rear fulcrum centering mechanisms must cooperate with each other to accurately and quickly complete the engine centering work.

[0004] There are two types of existing rear auxiliary fulcrum installation mechanisms for aviation turboshaft engines; one is installed at the hanging ear just below the engine combustion chamber casing, the installation position is concealed, and the existing new turboshaft engine is large in size, which is inconvenient to operate under the bottom of the engine; the other is installed at the hanging ears on both sides of the engine combustion chamber casing. Although it is convenient to install, the centering mechanism is complicated and not easy to operate, and the adjustment margin is small. It is necessary to repeatedly adjust different positions to meet the centering accuracy; the above two existing rear auxiliary fulcrum installation devices for aviation turboshaft engines have their own shortcomings, which are not conducive to improving the efficiency of engine loading and unloading. Therefore, it is extremely necessary to develop a new type of engine auxiliary fulcrum installation device to solve the problems of inconvenient installation of the rear auxiliary fulcrum of the aviation turboshaft engine, limited centering margin and thermal compensation. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a quadrilateral structure engine auxiliary support point installation device, the purpose of which is to be able to perform height fine-tuning of the engine's rear auxiliary mounting support point, cooperate with the engine's front main mounting support point to complete centering, improve the engine's centering accuracy and the efficiency of getting on and off the platform, and effectively compensate for the thermal expansion generated in its radial direction when the engine is working, thereby solving the problems of the rear auxiliary support point being inconvenient to install, the centering margin and the thermal compensation amount being limited during ground test installation of aviation turboshaft engines.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a quadrilateral engine auxiliary fulcrum mounting device, the mounting device comprising a mounting frame base, a cross arm mechanism disposed on the upper side of the mounting frame base, and two sets of symmetrically arranged adjustable vertical arm mechanisms disposed on the cross arm mechanism;

[0007] Each set of the adjustable vertical arm mechanism includes a vertical arm fine adjustment member, a lower vertical arm column pin connected to the horizontal arm mechanism is provided on the lower side of the vertical arm fine adjustment member, and two sets of auxiliary mounting members are provided on the top of the vertical arm fine adjustment member, and the auxiliary mounting members are connected to the upper vertical arm column pin at one end facing the vertical arm fine adjustment member;

[0008] The vertical arm fine adjustment component includes an adjusting screw, both ends of which are respectively connected to an upper joint bearing and a lower joint bearing, and two sets of locking nuts are threadedly connected to the adjusting screw.

[0009] Preferably, the upper joint bearing and the lower joint bearing are respectively engaged with the upper arm column pin and the lower arm column pin at one end opposite to the adjusting screw.

[0010] Preferably, both ends of the adjusting screw are provided with a forward-spinning thread and a reverse-spinning thread, respectively. The forward-spinning thread and the reverse-spinning thread are both fine-pitch trapezoidal threads, and the pitch of the fine-pitch trapezoidal threads is 2 mm.

[0011] Preferably, each group of auxiliary mounting parts includes a mounting seat, a fork ear seat is fixed at one end of the mounting seat, a row of two first pin holes is opened inside the fork ear seat, and a row of two second pin holes is opened inside the mounting seat, and a mounting section pin is clamped on the inner wall of the first pin hole.

[0012] Preferably, the two groups of auxiliary mounting parts are connected to the upper joint bearing through an upper arm column pin that is clamped on the inner wall of the second pin hole.

[0013] Preferably, the cross arm mechanism includes a cross arm, a pin hole is opened in the middle position of the cross arm, a copper bushing is fixed on the inner wall of the pin hole, a cross arm pin is clamped on the inner wall of the copper bushing, and the cross arm is connected to a connecting device through the cross arm pin.

[0014] Preferably, the connecting device includes a mounting part, and the mounting part includes a mounting base fixed to the top of the mounting frame base, a plurality of groups of second bolt holes are opened inside the mounting base, a guide key is fixed on the top of the mounting base, and a cross arm mounting part is movably connected to the top of the guide key.

[0015] Preferably, the cross arm mounting member includes a positioning plate, a row of two vertical plates arranged perpendicular to the top surface of the positioning plate are fixed on the top of the positioning plate, and four groups of first bolt holes are opened on the positioning plate, the first bolt holes are connected to the second bolt holes by bolts, and through holes are opened on the vertical plates.

[0016] Preferably, the thickness of the cross arm is smaller than the distance between the two vertical plates, and the outer surface of the cross arm pin is engaged with the inner wall of the through hole.

[0017] Preferably, both ends of the cross arm are connected to the lower joint bearing through the lower vertical arm pin.

[0018] Compared with the prior art, the present invention provides a quadrilateral engine auxiliary support mounting device, which has the following beneficial effects:

[0019] 1. By setting up two sets of adjustment vertical arm mechanisms and horizontal arm mechanisms, together with the engine body, a quadrilateral structure can be formed, which effectively restricts the five degrees of freedom of the engine auxiliary mounting fulcrum, so that the auxiliary mounting fulcrum can only move along the engine axial direction. By rotating the adjustment screw to change the distance between the upper and lower spherical bearings, the height of the engine auxiliary mounting fulcrum can be adjusted, and the centering work is completed in conjunction with the front main fulcrum of the engine, thereby improving the engine centering accuracy. In addition, the upper and lower spherical bearings themselves have a certain degree of rotational freedom, which can compensate for the radial thermal expansion of the engine.

[0020] 2. The two sets of adjustable arm mechanisms of the present invention are provided with two groups of four auxiliary mounting parts. The auxiliary mounting parts are connected to the auxiliary mounting fulcrums of the engine, providing a multi-point support function to complete the positioning and installation of the engine on the base of the mounting frame. The adjustable arm mechanism structure is evenly stressed and can effectively maintain stability during the engine testing process. The auxiliary mounting parts are small in size and easy to install, which improves the efficiency of engine installation and saves time and cost.

[0021] 3. The engine is easy to install on the platform. The vertical adjustment function of the vertical arm fine adjustment part is used to quickly and accurately assist in completing the concentricity adjustment of the engine and the input shaft of the power absorption device. The present invention has a simple structure and can meet the main support point installation requirements of various types of engines by changing the distance between the main support point and the engine by moving forward and backward. It is easy to change the installation position of the engine auxiliary installation node.

[0022] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of an installation of a quadrilateral engine auxiliary fulcrum installation device according to an embodiment of the present invention is shown;

[0025] Figure 2 It shows a front view of a quadrilateral engine auxiliary support point mounting device according to an embodiment of the present invention;

[0026] Figure 3 shows a perspective schematic diagram of an auxiliary mounting member according to an embodiment of the present invention;

[0027] Figure 4 A side view of a quadrilateral engine auxiliary support point mounting device according to an embodiment of the present invention is shown;

[0028] Figure 5 A perspective schematic diagram of a cross arm mounting member according to an embodiment of the present invention is shown.

[0029] In the figure: 1. Mounting frame base; 2. Cross arm mechanism; 21. Cross arm; 22. Cross arm pin; 23. Connecting device; 231. Cross arm mounting piece; 2311. Positioning plate; 2312. Vertical plate; 231a. Through hole; 231b. First bolt hole; 232. Guide key; 233. Mounting piece; 2331. Mounting base plate; 233a. Second bolt hole; 24. Copper bushing; 3. Adjusting vertical arm mechanism; 31. Auxiliary mounting piece; 311. Mounting seat; 31a. First pin hole; 312. Fork ear seat; 31b. Second pin hole; 313. Mounting section pin; 32. Upper vertical arm pin; 33. Lower vertical arm pin; 34. Vertical arm fine adjustment piece; 341. Adjusting screw; 342. Upper joint bearing; 343. Lower joint bearing; 344. Locking nut. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] like Figure 1As shown in the figure, the distribution of aircraft engine mounting points represents the way the engine is fixed on the aircraft, which is generally divided into main mounting points and auxiliary mounting points. The main mounting points bear the thrust of the engine, while the auxiliary mounting points only bear radial and circumferential loads, but not axial loads. The engine cross section where the main mounting points are located is called the main mounting surface, and the mounting surface without the main mounting points is called the auxiliary mounting surface. The main mounting points should be located on components with strong rigidity and strength, and at the same time, as far as possible, in an area with lower temperature.

[0032] During the ground test of the engine, a set of auxiliary support point installation devices is required to connect the engine mounting frame and the engine auxiliary support point to fix the engine to the mounting frame; the present invention proposes a quadrilateral structure engine auxiliary support point installation device. When the engine is installed on the platform, after the front main support point of the engine is installed, the quadrilateral structure of the device is used to connect the mounting frame base 1 and the engine rear auxiliary mounting support point to fix the engine to the mounting frame base 1, so that the engine rear support point can be automatically centered; the installation device includes a mounting frame base 1, a cross arm mechanism 2 is provided on the upper side of the mounting frame base 1, and two groups of symmetrically arranged adjustment arm mechanisms 3 are provided on the cross arm mechanism 2; the cross arm mechanism 2 is mainly used to support the adjustment arm mechanism 3 and fix the adjustment arm mechanism 3 on the mounting frame base 1; the two groups of symmetrically arranged adjustment arm mechanisms 3 work together to support the engine, and the two groups of adjustment arm mechanisms 3 cooperate with the front main mounting support point of the engine to fix the engine on the mounting frame base 1.

[0033] like Figure 2 As shown, each set of adjustable arm mechanisms 3 includes an arm fine-tuning part 34. The arm fine-tuning part 34 serves as a vertically adjustable supporting and connecting component, which can be used to adjust the position of the auxiliary fulcrum of the engine. A lower arm pin 33 connected to the cross arm mechanism 2 is provided on the lower side of the arm fine-tuning part 34, and two sets of auxiliary mounting parts 31 are provided on the top of the arm fine-tuning part 34. The auxiliary mounting parts 31 are used to connect the auxiliary mounting fulcrums of the engine to be ground tested. The auxiliary mounting parts 31 are connected to an upper arm pin 32 at one end facing the arm fine-tuning part 34; the upper joint bearing 342 and the lower joint bearing 343 are respectively engaged with the upper arm pin 32 and the lower arm pin 33 at one end facing away from the adjusting screw 341.

[0034] The vertical arm fine adjustment member 34 includes an adjusting screw 341, and the upper joint bearing 342 and the lower joint bearing 343 are connected to each other at both ends of the adjusting screw 341. The upper joint bearing 342 and the lower joint bearing 343 are connected through the adjusting screw 341; and two sets of locking nuts 344 are threadedly connected to the adjusting screw 341; the two ends of the adjusting screw 341 are respectively provided with a forward thread and a reverse thread. Rotating the adjusting screw 341 can change the distance between the upper joint bearing 342 and the lower joint bearing 343, thereby adjusting The engine auxiliary fulcrum height is adjusted to perform the centering operation, and since the upper joint bearing 342 and the lower joint bearing 343 themselves have a certain degree of rotational freedom, the radial thermal expansion of the engine can be supplemented; since two sets of locking nuts 344 are respectively installed at both ends of the adjusting screw 341, after the engine auxiliary fulcrum height is adjusted into place, a locking nut 344 adjacent to the upper joint bearing 342 and the lower joint bearing 343 can be rotated to tighten the upper joint bearing 342 and the lower joint bearing 343 to achieve the purpose of preventing loosening.

[0035] Both the forward and reverse threads are fine-pitch trapezoidal threads with a 2mm pitch. These threads not only allow for fine-tuning of the height but also provide a certain degree of relaxation, enabling precise alignment of the engine with the front main mounting fulcrum of the engine mount. After the height of the auxiliary engine fulcrum is adjusted, the locking nut 344 is locked, and a safety wire is inserted between the locking nut 344 and the adjusting screw 341 to prevent the locking nut 344 from loosening. These multiple safety wires ensure that the quadrilateral auxiliary engine fulcrum mounting device will not loosen on its own.

[0036] like Figure 3 As shown, each group of auxiliary mounting parts 31 includes a mounting seat 311, and a fork ear seat 312 is fixed at one end of the mounting seat 311, and a row of two first pin holes 31a is provided inside the fork ear seat 312, and a row of two second pin holes 31b is provided inside the mounting seat 311, and a mounting section column pin 313 is clamped on the inner wall of the first pin hole 31a; when fixing the engine, the fork ear seat 312 in the auxiliary mounting parts 31 on the two groups of adjusting arm mechanisms 3 are inserted into the auxiliary mounting fulcrum of the engine, and after aligning the holes, the mounting section column pin 313 is inserted along the inner wall of the first pin hole 31a to complete the fixing of the auxiliary mounting section of the engine. Two groups of auxiliary mounting parts 31 are provided on one group of adjusting arm mechanisms 3 to form a double fork ear structure. By setting the double fork ear structural component, the thermal expansion of the engine in its radial direction can be effectively compensated; the two groups of auxiliary mounting parts 31 are connected to the upper joint bearing 342 through the upper arm column pin 32 clamped on the inner wall of the second pin hole 31b.

[0037] like Figure 4 As shown, combined Figure 1The cross arm mechanism 2 includes a cross arm 21, a pin hole is opened in the middle position of the cross arm 21, a copper bushing 24 is fixed on the inner wall of the pin hole, a cross arm pin 22 is clamped on the inner wall of the copper bushing 24, and the cross arm 21 is connected to the connecting device 23 through the cross arm pin 22; due to the low density of copper, the friction between the cross arm 21 and the cross arm pin 22 can be reduced, and the connecting device 23 includes a mounting member 233, and the mounting member 233 includes a mounting base 2331 fixed to the top of the mounting frame base 1, and a plurality of groups of second bolt holes 2 are opened inside the mounting base 2331. 33a, a guide key 232 is fixed on the top of the mounting base 2331, and a cross arm mounting piece 231 is movably connected to the top of the guide key 232; by installing the guide key 232 on the mounting base 2331, it is ensured that the cross arm mounting piece 231 can only move in a single direction forward and backward along the guide key 232, and can adapt to the different positions of the auxiliary mounting fulcrums of different engines, and will not deviate from the center of the engine mounting frame base 1. Since there are multiple groups of second bolt holes 233a, they can be used to fix the cross arm mounting pieces 231 at different positions.

[0038] like Figure 5 As shown, the cross arm mounting member 231 includes a positioning plate 2311, and a row of two vertical plates 2312 arranged perpendicular to the top surface of the positioning plate 2311 are fixed on the top of the positioning plate 2311, and four groups of first bolt holes 231b are opened on the positioning plate 2311, and the first bolt holes 231b are connected to the second bolt holes 233a by bolts. Several groups of second bolt holes 233a distributed on the mounting base 2331 can meet the docking installation requirements of the positioning plates 2311 at different positions; when the cross arm 21 is adjusted, it moves forward and backward along the guide key 232 together with the positioning plate 2311 Move. After the position of the positioning plate 2311 is determined, insert the bolts into the first bolt hole 231b and the second bolt hole 233a to connect and fix the positioning plate 2311 and the mounting base plate 2331. When the position of the cross arm 21 needs to be adjusted again, remove the bolts connecting the first bolt hole 231b and the second bolt hole 233a. After the position of the cross arm 21 is adjusted, install the bolts again to limit it; a through hole 231a is opened on the vertical plate 2312. When the cross arm 21 and the connecting device 23 are assembled and installed, the cross arm pin 22 is passed through the through hole 231a and the copper bushing 24 for connection.

[0039] The thickness of the cross arm 21 is less than the distance between the two vertical plates 2312, that is, the width of the groove surrounded by the two vertical plates 2312 is slightly larger than the thickness of the cross arm 21. By leaving a certain margin, the position of the cross arm 21 can be easily adjusted; the outer surface of the cross arm pin 22 is clamped with the inner wall of the through hole 231a, and both ends of the cross arm 21 are connected to the lower joint bearing 343 through the lower vertical arm pin 33, thereby connecting the cross arm mechanism 2 and the adjustable vertical arm mechanism 3 into a whole.

[0040] When limiting the auxiliary mounting support (auxiliary mounting joint) of the engine, the auxiliary mounting support (auxiliary mounting joint) of the engine has six degrees of freedom in space as a rigid body; a line passing through the center of mass of the rigid body is selected to represent the axis of the rigid body. Under the premise of ensuring that the position of the center of mass of the rigid body remains unchanged, the rotation of the axis represents the rotation of the rigid body, and the rotation of the axis is determined by its three spatial direction cosines. Since the sum of the squares of the three direction cosines is equal to 1, the rigid body has two rotational degrees of freedom; at the same time, since the rigid body itself can rotate clockwise or counterclockwise around the axis, the rigid body has one rotational degree of freedom. In addition, the center of mass of the rigid body has three translational degrees of freedom in space. Therefore, the rigid body has two rotational degrees of freedom, one rotational degree of freedom, and three translational degrees of freedom in space, a total of six degrees of freedom; to determine the position of the rigid body in space, three axial force constraints and three rotational constraints need to be applied.

[0041] The present invention forms a quadrilateral structure by setting two sets of adjusting vertical arm mechanisms 3 and cross arm mechanisms 2, and the engine body is combined to form a quadrilateral structure. The fork ear seat 312 in the auxiliary mounting part 31 is inserted into the auxiliary mounting fulcrum of the engine. After the hole is aligned, the mounting section pin 313 is inserted along the inner wall of the first pin hole 31a to complete the clamping fixation between the auxiliary mounting part 31 and the auxiliary mounting fulcrum of the engine, limit the rotation of the auxiliary mounting fulcrum around its axis passing through the center of mass and the rotation of the axis itself, apply rotation constraint to the auxiliary mounting fulcrum, and realize the limitation of the two rotational degrees of freedom and rotational degrees of freedom of the auxiliary mounting fulcrum; at the same time, the size of the cross arm mechanism 2 sandwiched between the two sets of adjusting vertical arm mechanisms 3 is constant, and the two sets of adjusting vertical arm mechanisms 3 work together to limit the translational degrees of freedom of the auxiliary mounting fulcrum in two directions; the quadrilateral structure well limits the five degrees of freedom of the auxiliary mounting fulcrum of the engine, so that the auxiliary mounting fulcrum can only move a certain distance along the axial direction of the engine.

[0042] The present invention provides an engine mounting frame rear auxiliary fulcrum installation device with multi-point support, thermal expansion compensation and centering functions, which is suitable for an aviation turboshaft engine complete test bench. When the engine is installed on the test bench, after the front main fulcrum of the engine is installed, the quadrilateral structure of the device can automatically adjust the rear fulcrum of the engine and effectively compensate for the thermal expansion generated in the radial direction when the engine is working; the multi-point support function of the device is used to complete the positioning and installation of the engine on the mounting frame, so that the force is evenly distributed and the engine is convenient to install on the test bench; the vertical adjustment function of the vertical arm fine adjustment member 34 is used to quickly and accurately assist in completing the concentricity adjustment work between the engine and the input shaft of the power absorption device; through the above functions, the device can solve the problems of the inconvenience of installing the rear auxiliary fulcrum and the limited centering margin and thermal compensation during the ground test installation of the aviation turboshaft engine.

[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quadrilateral engine auxiliary support mounting device, characterized by: The mounting device comprises a mounting frame base (1), a horizontal arm mechanism (2) is provided on the upper side of the mounting frame base (1), and two sets of symmetrically arranged adjusting vertical arm mechanisms (3) are provided on the horizontal arm mechanism (2); The cross arm mechanism (2) includes a cross arm (21), a pin hole is provided in the middle of the cross arm (21), a copper bushing (24) is fixed on the inner wall of the pin hole, a cross arm pin (22) is clamped on the inner wall of the copper bushing (24), and the cross arm (21) is connected to a connecting device (23) via the cross arm pin (22); The connecting device (23) includes a mounting member (233), the mounting member (233) includes a mounting base (2331) fixed to the top of the mounting frame base (1), a plurality of groups of second bolt holes (233a) are provided inside the mounting base (2331), a guide key (232) is fixed to the top of the mounting base (2331), and a cross arm mounting member (231) is movably connected to the top of the guide key (232); Each set of the adjustable vertical arm mechanism (3) includes a vertical arm fine adjustment member (34), a lower vertical arm column pin (33) connected to the horizontal arm mechanism (2) is provided on the lower side of the vertical arm fine adjustment member (34), and two sets of auxiliary mounting members (31) are provided on the top of the vertical arm fine adjustment member (34), and an upper vertical arm column pin (32) is connected to one end of the auxiliary mounting member (31) facing the vertical arm fine adjustment member (34); The vertical arm fine adjustment member (34) comprises an adjusting screw (341), the two ends of the adjusting screw (341) are respectively connected to an upper joint bearing (342) and a lower joint bearing (343), and the adjusting screw (341) is threadedly connected to two sets of locking nuts (344).

2. The quadrilateral engine auxiliary support mounting device according to claim 1, characterized in that: The upper joint bearing (342) and the lower joint bearing (343) are respectively connected to the upper vertical arm column pin (32) and the lower vertical arm column pin (33) at one end opposite to the adjusting screw (341).

3. The quadrilateral engine auxiliary support mounting device according to claim 1, characterized in that: Both ends of the adjusting screw (341) are provided with a forward-spinning thread and a reverse-spinning thread, respectively. The forward-spinning thread and the reverse-spinning thread are both fine-pitch trapezoidal threads, and the pitch of the fine-pitch trapezoidal threads is 2 mm.

4. The quadrilateral engine auxiliary support mounting device according to claim 1, characterized in that: Each group of auxiliary mounting parts (31) includes a mounting seat (311), a fork ear seat (312) is fixed to one end of the mounting seat (311), a row of two first pin holes (31a) are provided inside the fork ear seat (312), a row of two second pin holes (31b) are provided inside the mounting seat (311), and a mounting section pin (313) is clamped on the inner wall of the first pin hole (31a).

5. The quadrilateral engine auxiliary support mounting device according to claim 1 or 4, characterized in that: Both sets of auxiliary mounting parts (31) are connected to the upper joint bearing (342) via an upper vertical arm column pin (32) that is clamped on the inner wall of the second pin hole (31b).

6. The quadrilateral engine auxiliary support mounting device according to claim 1, characterized in that: The cross arm mounting member (231) includes a positioning plate (2311), a row of two vertical plates (2312) arranged perpendicular to the top surface of the positioning plate (2311) are fixed on the top of the positioning plate (2311), and four groups of first bolt holes (231b) are opened on the positioning plate (2311), the first bolt holes (231b) and the second bolt holes (233a) are connected by bolts, and a through hole (231a) is opened on the vertical plate (2312).

7. The quadrilateral engine auxiliary support mounting device according to claim 1, characterized in that: The thickness of the cross arm (21) is less than the distance between the two vertical plates (2312), and the outer surface of the cross arm pin (22) is engaged with the inner wall of the through hole (231a).

8. The quadrilateral engine auxiliary support mounting device according to claim 1, characterized in that: Both ends of the cross arm (21) are connected to the lower joint bearing (343) via the lower vertical arm pin (33).

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