Engine crankshaft connecting rod swing dynamic balance test equipment

Abstract

The present invention relates to the technical field of component dynamic balancing test, and in particular to an engine crankshaft connecting rod swing dynamic balancing test device, comprising a crankshaft, wherein the left end of the crankshaft is used to connect a flywheel, and the right end of the crankshaft is used to connect a power source, and inner connecting rod units are respectively mounted on the outer side walls of the connecting rod journal sections of the two connecting rod cranks in the middle of the crankshaft, and outer connecting rod units are respectively symmetrically arranged on the outer sides of each of the inner connecting rod units, and an inner test piston unit and an outer test piston unit are respectively fixedly arranged above each of the inner connecting rod units and each of the outer connecting rod units. The engine crankshaft connecting rod swing dynamic balancing test device used in the present invention can complete the dynamic balancing test of connecting rod simulation parts with different connecting rod ratios in swinging and moving states, effectively realize the collection and output of test parameters of the connecting rod in the simulated moving state, and effectively provide a reference basis for the reasonable design of the actual crank connecting rod.

Description

Technical Field

[0001] The invention relates to the technical field of component dynamic balance testing, in particular to engine crankshaft connecting rod swing dynamic balance testing equipment. Background Art

[0002] The engine crankshaft connecting rod is a key mechanical component in the automobile engine. Its function is to convert the reciprocating motion of the piston into the rotational motion of the crankshaft, and at the same time convert the force acting on the piston into the torque output by the crankshaft. From its working principle, it can be seen that the dynamic balance simulation test of the crankshaft connecting rod mechanical parts is of great significance to the safe and stable operation of the crankshaft connecting rod and the engine.

[0003] After searching, it was found that a patent document with patent application number CN201811519612.6 disclosed an engine connecting rod small end bearing assessment test bench and test system, which mainly simulates the swinging motion of the connecting rod small end bearing, simulates the load borne by the connecting rod small end bearing and other operating conditions. However, this conventional connecting rod small end swing test bench can only simulate the explosion pressure of the engine, but cannot simulate the inertia force of the piston under the connecting rod movement state under different specifications. Therefore, its lubrication state will be greatly different from the original machine, and the accuracy of the simulation analysis is relatively one-sided, and it is impossible to perform experimental verification and evaluation of the connecting rod movement state under the whole machine working conditions.

[0004] In actual operating conditions, since the engine vibration is directly related to the connecting rod structure design, the vibration of the engine crank connecting rod will affect the stability of the entire vehicle operation.

[0005] Therefore, it is particularly necessary to design a new dynamic balancing motion test equipment that can assist the crank-connecting rod design and simulate the test of connecting rod parts under different connecting rod ratios.

[0006] Based on this, the present invention optimizes the design for the problems existing in the existing simulation test of engine connecting rod components, and hereby proposes an engine crankshaft connecting rod swing dynamic balance simulation test equipment that can simulate and test connecting rod mechanical components of different specifications in the operating state of the engine crankshaft, so as to better solve the problems existing in the prior art. Summary of the invention

[0007] The present invention solves one of the above-mentioned technical problems, and the technical solution adopted is: an engine crankshaft connecting rod swing dynamic balancing test device, comprising a crankshaft, wherein the left end of the crankshaft is used to connect a flywheel, and the right end of the crankshaft is used to connect power, the journal portion of the crankshaft located at the left end of the crankshaft and the journal portion of the crankshaft located at the right end of the crankshaft both realize fixed-axis rotation limiting through bearings, inner connecting rod units are respectively mounted on the outer side walls of the connecting rod journal sections of the two connecting rod cranks in the middle of the crankshaft, outer connecting rod units are respectively symmetrically arranged on the outside of each of the inner connecting rod units, and inner test piston units and outer test piston units are respectively fixedly arranged above each of the inner connecting rod units and each of the outer connecting rod units, each of the inner test piston units is respectively movably hinged to the top of the inner connecting rod unit at its corresponding position, and each of the outer test piston units is respectively movably hinged to the top of the outer connecting rod unit at its corresponding position.

[0008] In any of the above solutions, preferably, the top of each of the inner test piston units and the top of each of the outer test piston units are fixedly mounted on the bottom of the rigid frame.

[0009] In any of the above schemes, it is preferred that the inner test piston unit cooperates with the outer test piston unit to implement dynamic balance vibration testing of the inner connecting rod unit and the outer connecting rod unit in different length states during operation.

[0010] In any of the above schemes, preferably, the internal test piston unit includes a vertically arranged first test cylinder, a first piston is cooperatedly installed in a first piston chamber of the first test cylinder, the lower part of the first piston is movably hinged to the top of the inner connecting rod unit corresponding thereto, a first top cover is fixedly and sealingly installed at the top opening of the first test cylinder, the top of the first top cover is fixed to the bottom of the rigid frame, and a first strain type pressure sensor is fixedly installed at the bottom of the first top cover, and the first strain type pressure sensor is used for monitoring the gas vibration inside the first piston chamber and feeding back the parameters to an external control system.

[0011] In any of the above schemes, preferably, the external test piston unit includes a vertically arranged second test cylinder, a second piston is cooperatedly installed in the second piston chamber of the second test cylinder, the lower part of the second piston is movably hinged to the top of the corresponding outer connecting rod unit thereunder, a second top cover is fixedly and sealingly installed at the top opening of the second test cylinder, the top of the second top cover is fixed to the bottom of the rigid frame, and a second strain type pressure sensor is fixedly installed on the bottom of the second top cover, and the second strain type pressure sensor is used for monitoring the gas vibration inside the second piston chamber and feeding back the parameters to the external control system.

[0012] In any of the above solutions, preferably, the inner connecting rod unit and the outer connecting rod unit both use a variable diameter connecting rod assembly with the same structure;

[0013] The reducer connecting rod assembly includes a small-head connecting rod located at the top, a large-head connecting rod is spaced apart directly below the small-head connecting rod, the lower end of the large-head connecting rod is movably sleeved on the outer wall of the crankshaft journal at its corresponding position, the top of the small-head connecting rod is movably hinged to the bottom of the first piston or the bottom of the second piston at its corresponding position, and a reducer unit is arranged between the small-head connecting rod and the large-head connecting rod, and the reducer unit is used to control the interval length between the small-head connecting rod and the large-head connecting rod and the current center of gravity adjustment of the reducer connecting rod assembly.

[0014] In any of the above schemes, it is preferred that an upper through cavity is provided in the middle of the small-head connecting rod, and a lower through cavity is provided in the middle of the large-head connecting rod, the upper end of the variable diameter unit extends into the upper through cavity, and the lower part of the variable diameter unit extends into the lower through cavity.

[0015] In any of the above schemes, it is preferred that the variable diameter unit includes two relatively spaced and vertically arranged double-headed studs, the upper end of each of the double-headed studs is movable through the bottom of the small-head connecting rod and extends into the upper through-cavity, and the lower end of each of the double-headed studs is movable through the top of the large-head connecting rod and extends into the lower through-cavity, and upper locking nuts are respectively screwed on the externally threaded side walls of the double-headed studs in the upper through-cavity and below the small-head connecting rod, and the two upper locking nuts cooperate to lock the bottom of the small-head connecting rod, and lower locking nuts are respectively screwed on the externally threaded side walls of the double-headed studs in the lower through-cavity and above the large-head connecting rod, and the two lower locking nuts cooperate to lock the top of the large-head connecting rod.

[0016] In any of the above schemes, preferably, a center of gravity adjusting member is installed in the middle of the variable diameter unit, and the center of gravity adjusting member adjusts the center of gravity of the currently corresponding inner connecting rod unit or the outer connecting rod unit by controlling its own lifting and lowering.

[0017] In any of the above schemes, it is preferred that the center of gravity adjusting part includes two counterweight steel nuts which are respectively screwed into the outer side walls of the corresponding stud bolts, and the two counterweight steel nuts maintain synchronous adjustment or locking; a plurality of magnetic holes are arranged at intervals on the side wall planes of each counterweight steel nut, and strong magnetic counterweight parts are symmetrically installed on the front and rear sides of the two counterweight steel nuts, and the inner sides of the strong magnetic counterweight parts are fixedly installed in each magnetic hole.

[0018] In any of the above schemes, it is preferred that the strong magnetic counterweight component includes a strong magnetic block arranged on one side of the two counterweight steel nuts, the inner wall of the strong magnetic block is magnetically fixed to the outer wall plane of the counterweight steel nut, and a protrusion is integrally formed on the inner wall of each strong magnetic block, and each protrusion is interference fit and installed in the corresponding magnetic hole; a counterweight block is fixedly installed in the middle of the outer wall of each strong magnetic block.

[0019] Preferably, in any of the above schemes, an upper locking piece is provided on one side of the two adjacent upper locking nuts; and a lower locking piece is provided on one side of the two adjacent lower locking nuts.

[0020] In any of the above schemes, it is preferred that the upper locking member includes a horizontally arranged upper U-shaped limit frame, the opening of the upper U-shaped limit frame faces the two upper locking nuts on its corresponding sides, the upper and lower side walls of the upper U-shaped cavity of the upper U-shaped limit frame respectively abut against the outer wall planes of the upper locking nuts at their corresponding positions and realize anti-rotation limiting for the two upper locking nuts; an upper plug is integrally formed at the center of the inner wall at the end of the upper U-shaped limit frame, and the inner end of the upper plug is hot-melt glued to the upper side blind hole at the corresponding side wall of the small head connecting rod.

[0021] In any of the above schemes, it is preferred that the lower locking member includes a horizontally arranged lower U-shaped limit frame, the opening of the lower U-shaped limit frame faces the two lower locking nuts on its corresponding sides, the upper and lower side walls of the lower U-shaped cavity of the lower U-shaped limit frame respectively abut against the outer wall planes of the lower locking nuts at their corresponding positions and realize anti-rotation limiting for the two lower locking nuts; a lower plug is integrally formed with the center of the inner wall at the end of the lower U-shaped limit frame, and the inner end of the lower plug is hot-melt glued to the lower side blind hole at the corresponding side wall of the big head connecting rod.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The engine crankshaft connecting rod swing dynamic balance test equipment used in the present invention can complete the dynamic balance test of connecting rod simulation parts with different connecting rod ratios under swing and motion states, effectively realize the collection and output of test parameters of the connecting rod under simulated motion state, and effectively provide a reference basis for the reasonable design of the actual crank connecting rod.

[0024] 2. In addition, this device can also achieve the purpose of simulating the matching of the current inner connecting rod unit and the outer connecting rod unit with the processed or tested connecting rod parameters by adjusting the variable diameter unit, and rely on this device to complete the predictive simulation test of motion dynamic balance.

[0025] 3. The inner connecting rod unit and the outer connecting rod unit designed in the engine crankshaft connecting rod swing dynamic balancing test equipment of the present invention can be adjusted as needed to achieve the purpose of adjusting their respective parameters, so as to simulate the test of engine operation balance under various connecting rod ratios, effectively test the secondary imbalance effects brought about by different connecting rod ratios in actual movement, and complete the collection, transmission and feedback of parameters.

[0026] 4. The entire engine crankshaft connecting rod swing dynamic balancing test equipment relies on the regulation of the corresponding variable diameter connecting rod assembly to effectively realize the rapid regulation of the connecting rod ratio of different connecting rods in the current engine. At the same time, after adjustment, the connecting rod ratio can be guaranteed to remain relatively unchanged during operation, reducing the adverse effects such as length changes caused by random vibration of the variable diameter connecting rod assembly.

[0027] 5. The variable diameter connecting rod assembly in the present invention can adjust its length as needed according to actual test requirements during adjustment, effectively ensuring the synchronization of each inner connecting rod unit and outer connecting rod unit during operation after adjustment, and avoiding the occurrence of motion dead points and motion interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0029] Figure 1 It is a structural schematic diagram of the engine crankshaft connecting rod swing dynamic balance test equipment of the present invention.

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the inner connecting rod unit and the outer connecting rod unit of the present invention in the installed state.

[0031] Figure 3 It is a schematic diagram of the partial three-dimensional structure of the inner connecting rod unit and the outer connecting rod unit of the present invention in the installed state.

[0032] Figure 4 The figure is a schematic diagram of the internal structure of the engine crankshaft connecting rod swing dynamic balance test equipment of the present invention.

[0033] Figure 5 It is a schematic diagram of the crankshaft structure of the present invention.

[0034] Figure 6 It is a schematic diagram of the partial three-dimensional structure of the inner connecting rod unit of the present invention.

[0035] Figure 7 It is a schematic diagram of the partial structure of the outer connecting rod unit of the present invention.

[0036] Figure 8 It is a schematic diagram of a three-dimensional structure of a partial cross-section of the inner connecting rod unit of the present invention.

[0037] Fig. 9 for Figure 8 Schematic diagram of the local enlarged structure.

[0038] Fig.10 It is a schematic diagram of the three-dimensional structure of the strong magnetic counterweight of the present invention.

[0039] Fig.11 It is a schematic diagram of the three-dimensional structure of the upper locking member of the present invention.

[0040] Fig.12 It is a schematic diagram of the three-dimensional structure of the lower locking member of the present invention.

[0041] In the figure, 1, crankshaft; 2, journal; 3, inner connecting rod unit; 4, outer connecting rod unit; 5, inner test piston unit; 6, outer test piston unit; 7, rigid frame; 8, first piston chamber; 9, first piston; 10, first top cover; 11, first strain gauge pressure sensor; 12, second test cylinder; 13, second piston chamber; 14, second piston; 15, second top cover; 16, second strain gauge pressure sensor; 17, small head connecting rod; 18, large head connecting rod; 19 , upper through cavity; 20, lower through cavity; 21, stud; 22, upper locking nut; 23, lower locking nut; 24, counterweight steel nut; 25, magnetic hole; 26, strong magnetic block; 27, raised part; 28, counterweight; 29, upper U-shaped limit frame; 30, upper U-shaped cavity; 31, upper plug; 32, lower U-shaped limit frame; 33, lower U-shaped cavity; 34, lower plug; 35, lower side blind hole; 36, upper side blind hole; 37, first test cylinder. DETAILED DESCRIPTION

[0042] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-Figure 12 as shown in .

[0043] Embodiment 1: An engine crankshaft connecting rod swing dynamic balancing test device comprises a crankshaft 1, wherein the left end of the crankshaft 1 is used to connect to a flywheel, and the right end of the crankshaft 1 is used to connect to power, the crankshaft journal 2 located at the left end of the crankshaft 1 and the crankshaft journal 2 located at the right end of the crankshaft 1 are both limited in fixed-axis rotation by bearings, inner connecting rod units 3 are respectively mounted on the outer side walls of the connecting rod journal sections of the two connecting rod cranks in the middle of the crankshaft 1, outer connecting rod units 4 are symmetrically arranged on the outside of each of the inner connecting rod units 3, and inner test piston units 5 and outer test piston units 6 are respectively fixedly arranged above each of the inner connecting rod units 3 and each of the outer connecting rod units 4, each of the inner test piston units 5 is movably hinged to the top of the inner connecting rod unit 3 at its corresponding position, and each of the outer test piston units 6 is movably hinged to the top of the outer connecting rod unit 4 at its corresponding position.

[0044] It should be noted that: since the secondary unbalanced force during the operation of the engine will produce vibration, the secondary unbalanced force caused by the connecting rod is different when it is in different length states; when the calculation of the secondary unbalanced force is relatively complicated in the actual design, the simulation test method can better show the effect of the current engine connecting rod design parameters in actual use. In the present invention, the inner connecting rod unit 3 and the outer connecting rod unit 4 are used to simulate the connecting rod parts under different connecting rod ratio states respectively. At the same time, after the external power is connected, the corresponding inner test piston unit 5 and the outer test piston unit 6 can receive the dynamic balance vibration and impact brought by the current corresponding inner connecting rod unit 3 or the outer connecting rod unit 4 to the gas inside the piston cavity during operation to analyze the use effect and stability of the connecting rod under different parameter design states when simulating the actual operation state.

[0045] Among them, the parameters of each inner link unit 3 and each outer link unit 4 can be designed relatively independently and can be individually adjusted and used in combination according to design requirements. During testing, the vibration parameters brought by each inner link unit 3 and outer link unit 4 can be obtained individually, and the overall result can be output quickly.

[0046] In any of the above solutions, preferably, the top of each of the inner test piston units 5 and the top of each of the outer test piston units 6 are fixedly mounted on the bottom of the rigid frame 7. The rigid frame 7 is in a fixed state, which can provide a positioning reference for the entire device.

[0047] In any of the above schemes, it is preferred that the inner test piston unit 5 cooperates with the outer test piston unit 6 to implement dynamic balance vibration testing of the inner connecting rod unit 3 and the outer connecting rod unit 4 in different length states during operation.

[0048] Testing the inner connecting rod unit 3 and the outer connecting rod unit 4 at different lengths can better adjust according to design needs. At the same time, after adjustment, the current design parameter requirements can be simulated to adjust the length of the connecting rod, thereby achieving the purpose of rapid simulation and testing, and can better assist actual design and processing production.

[0049] In any of the above schemes, it is preferred that the internal test piston unit 5 includes a vertically arranged first test cylinder 37, in which a first piston 9 is cooperatedly installed in a first piston chamber 8 of the first test cylinder 37, the lower part of the first piston 9 is movably hinged to the top of the inner connecting rod unit 3 corresponding thereto, and a first top cover 10 is fixedly and sealingly installed at the top opening of the first test cylinder 37, the top of the first top cover 10 is fixed to the bottom of the rigid frame 7, and a first strain type pressure sensor 11 is fixedly installed at the bottom of the first top cover 10, and the first strain type pressure sensor 11 is used to monitor the gas vibration inside the first piston chamber 8 and feed back the parameters to the external control system.

[0050] It should be noted that: the inner test piston unit 5 as a whole relies on the first test cylinder 37 as a fixed constraint structure. When the first piston 9 inside the first piston chamber 8 is movably hinged with the inner connecting rod unit 3, the movement state of the inner connecting rod unit 3 can be directly reflected in the feedback of its impact on the inside of the first piston chamber 8 through the operating state of the first piston 9 driven by it, thereby completing data collection for the gas vibration conditions inside the first piston chamber 8 caused by different operating cycles and different acceleration states, and then quickly cooperating with the existing external control system to quickly analyze the dynamic balance of the engine operation under the current connecting rod ratio state.

[0051] Among them, the first strain gauge pressure sensor 11 uses an existing strain gauge pressure sensor to accurately collect parameter changes caused by changes in air pressure and impact inside the first piston chamber 8, thereby ensuring the relative accuracy of collected data under the test state.

[0052] In any of the above schemes, it is preferred that the external test piston unit 6 includes a vertically arranged second test cylinder 12, in which a second piston 14 is cooperatedly installed in a second piston chamber 13 of the second test cylinder 12, the lower part of the second piston 14 is movably hinged to the top of the corresponding outer connecting rod unit 4 thereunder, and a second top cover 15 is fixedly and sealingly installed at the top opening of the second test cylinder 12, the top of the second top cover 15 is fixed to the bottom of the rigid frame 7, and a second strain type pressure sensor 16 is fixedly installed at the bottom of the second top cover 15, and the second strain type pressure sensor 16 is used to monitor the gas vibration inside the second piston chamber 13 and feed back the parameters to the external control system.

[0053] It should be noted that: the outer test piston unit 6 as a whole relies on the second test cylinder 12 as a fixed constraint structure. When the second piston 14 inside the second piston chamber 13 is movably hinged with the outer connecting rod unit 4, the movement state of the outer connecting rod unit 4 can be directly reflected in the feedback of its impact on the inside of the second piston chamber 13 through the operating state of the second piston 14 driven by it, thereby completing data collection for the gas vibration conditions inside the second piston chamber 13 caused by different operating cycles and different acceleration states, and then quickly cooperating with the existing external control system to quickly analyze the dynamic balance of the engine operation under the current connecting rod ratio state.

[0054] The second strain gauge pressure sensor 16 uses an existing strain gauge pressure sensor to accurately collect parameter changes caused by changes in the internal air pressure of the second piston chamber 13 and impact, thereby ensuring the relative accuracy of the collected data under the test state.

[0055] In any of the above solutions, it is preferred that the inner connecting rod unit 3 and the outer connecting rod unit 4 both adopt a reducing connecting rod assembly with the same structure.

[0056] The reducer connecting rod assembly includes a small-head connecting rod 17 located at the top, and a large-head connecting rod 18 is spaced apart directly below the small-head connecting rod 17. The lower end of the large-head connecting rod 18 is movably sleeved on the outer side wall of the crankshaft journal 2 at its corresponding position, and the top of the small-head connecting rod 17 is movably hinged to the bottom of the first piston 9 or the bottom of the second piston 14 at its corresponding position. A reducer unit is provided between the small-head connecting rod 17 and the large-head connecting rod 18, and the reducer unit is used to control the interval length between the small-head connecting rod 17 and the large-head connecting rod 18 and the current center of gravity adjustment of the reducer connecting rod assembly.

[0057] The inner connecting rod unit 3 and the outer connecting rod unit 4 use a variable diameter connecting rod assembly to adjust the overall length of the structure equivalent to the connecting rod formed by the current inner connecting rod unit 3 or the outer connecting rod unit 4 within different length ranges. During the adjustment process, different connecting rod ratios can be controlled, so that the connecting rod ratio of the current connecting rod can be adjusted as needed, and the actual situation of the connecting rod structure with different connecting rod ratios under the motion test simulation state can be completed, which is convenient for pre-analysis of different operating states of the corresponding connecting rod parts under the same engine crankshaft 1 driven state for different design schemes in the actual design.

[0058] After adjusting the variable diameter connecting rod assembly, considering that the connecting rod structure in the simulated state of the deformation range of the inner connecting rod unit 3 and the outer connecting rod unit 4 is more closely related to the actual product, a variable diameter unit is used here to complete the regulation of the center of gravity of the newly formed connecting rod structure, further ensuring the relatively accurate control of the parameters during the simulation test.

[0059] In any of the above schemes, it is preferred that an upper through cavity 19 is provided in the middle of the small-head connecting rod 17, and a lower through cavity 20 is provided in the middle of the large-head connecting rod 18, the upper end of the variable diameter unit extends into the upper through cavity 19, and the lower part of the variable diameter unit extends into the lower through cavity 20.

[0060] The upper through cavity 19 and the lower through cavity 20 provided here can better provide sufficient adjustment reserved space for adjusting the spacing distance between the current small-head connecting rod 17 and the large-head connecting rod 18 .

[0061] In any of the above schemes, it is preferred that the variable diameter unit includes two relatively spaced and vertically arranged studs 21, the upper end of each of the studs 21 is movable through the bottom of the small-head connecting rod 17 and extends into the upper through cavity 19, and the lower end of each of the studs 21 is movable through the top of the large-head connecting rod 18 and extends into the lower through cavity 20, and upper locking nuts 22 are respectively screwed on the external threaded side walls of the studs 21 in the upper through cavity 19 and below the small-head connecting rod 17, and the two upper locking nuts 22 cooperate to lock the bottom of the small-head connecting rod 17, and lower locking nuts 23 are respectively screwed on the external threaded side walls of the studs 21 in the lower through cavity 20 and above the large-head connecting rod 18, and the two lower locking nuts 23 cooperate to lock the top of the large-head connecting rod 18.

[0062] In any of the above schemes, it is preferred that a center of gravity adjusting member is installed in the middle of the variable diameter unit, and the center of gravity adjusting member adjusts the center of gravity of the currently corresponding inner connecting rod unit 3 or the outer connecting rod unit 4 by controlling its own lifting and lowering.

[0063] It should be noted that: when completing the adjustment of the variable diameter unit, it mainly relies on the fixed positions of the small-head connecting rod 17 and the large-head connecting rod 18 on the upper and lower parts of the double-headed stud 21 to achieve the purpose of adjusting the length of the connecting rod structure newly formed by the small-head connecting rod 17, the large-head connecting rod 18 and the variable diameter unit, thereby facilitating the adjustment of the connecting rod ratio of the current connecting rod structure.

[0064] By means of the upper locking nuts 22 and the lower locking nuts 23, the threaded connection parts can be effectively clamped, thereby ensuring the stability of the connecting rod structure under frequent periodic operation.

[0065] Embodiment 2: Compared with Embodiment 1, this embodiment is different in that it also includes the following technical features:

[0066] In any of the above schemes, it is preferred that the center of gravity adjusting part includes two counterweight steel nuts 24 which are respectively screwed into the outer wall of the corresponding stud 21, and the two counterweight steel nuts 24 are kept synchronously adjusted or locked; a plurality of magnetic holes 25 are arranged at intervals on the side wall planes of each counterweight steel nut 24, and strong magnetic counterweight parts are symmetrically installed on the front and rear sides of the two counterweight steel nuts 24, and the inner sides of the strong magnetic counterweight parts are fixedly installed in each magnetic hole 25.

[0067] When adjusting the center of gravity, the center of gravity adjusting member relies on screwing together two weight steel nuts 24 to achieve its lifting and lowering control, thereby achieving the purpose of adjusting the overall center of gravity of the entire connecting rod unit.

[0068] The configured strong magnetic counterweight can not only simultaneously lock the two counterweight steel nuts 24 against rotation, but also increase the counterweight. In addition, the strong magnetic counterweight is magnetically fixed to one side of the counterweight steel nut 24 to ensure the stability of its connection.

[0069] In any of the above schemes, it is preferred that the strong magnetic counterweight component includes a strong magnetic block 26 arranged on one side of the two counterweight steel nuts 24, the inner wall of the strong magnetic block 26 is magnetically fixed to the outer wall plane of the counterweight steel nut 24, and a protrusion 27 is integrally formed on the inner wall of each of the strong magnetic blocks 26, and each of the protrusions 27 is interference fit and installed in the corresponding magnetic hole 25; a counterweight block 28 is fixedly installed in the middle of the outer wall of each of the strong magnetic blocks 26.

[0070] The strong magnetic block 26 can effectively achieve stable positioning by relying on its own magnetic force. When it cooperates with each protrusion 27 to complete the magnetic fixation, it can further ensure the stability of the fixed positioning and prevent the situation of falling off due to random vibration.

[0071] In any of the above schemes, preferably, an upper locking piece is provided on one side of the two adjacent upper locking nuts 22 ; and a lower locking piece is provided on one side of the two adjacent lower locking nuts 23 .

[0072] In any of the above schemes, it is preferred that the upper locking member includes a horizontally arranged upper U-shaped limit frame 29, the opening of the upper U-shaped limit frame 29 faces the two upper locking nuts 22 on its corresponding sides, and the upper and lower side walls of the upper U-shaped cavity 30 of the upper U-shaped limit frame 29 respectively abut against the outer wall planes of the upper locking nuts 22 at their corresponding positions and realize anti-rotation limiting for the two upper locking nuts 22; an upper plug 31 is integrally formed at the center of the inner wall at the end of the upper U-shaped limit frame 29, and the inner end of the upper plug 31 is hot-melt glued into the upper side blind hole 36 at the corresponding side wall of the small head connecting rod 17.

[0073] The upper locking member can simultaneously clamp and position the upper and lower upper locking nuts 22 , effectively preventing the two upper locking nuts 22 from rotating and loosening.

[0074] In any of the above schemes, it is preferred that the lower locking member includes a horizontally arranged lower U-shaped limit frame 32, the opening of the lower U-shaped limit frame 32 faces the two lower locking nuts 23 on its corresponding sides, and the upper and lower side walls of the lower U-shaped cavity 33 of the lower U-shaped limit frame 32 respectively abut against the outer wall planes of the lower locking nuts 23 at their corresponding positions and realize anti-rotation limiting for the two lower locking nuts 23; a lower plug 34 is integrally formed with the center of the inner wall at the end of the lower U-shaped limit frame 32, and the inner end of the lower plug 34 is hot-melt glued into the lower side blind hole 35 at the corresponding side wall of the big head connecting rod 18.

[0075] The lower locking member can simultaneously clamp and position the two lower locking nuts 23, thereby effectively preventing the two lower locking nuts 23 from rotating and loosening.

[0076] Specific working principle: In actual design, the calculation of secondary unbalanced force is relatively complicated, so the simulation test method can better demonstrate the effect of the current engine connecting rod design parameters in actual use.

[0077] In the present invention, the inner connecting rod unit 3 and the outer connecting rod unit 4 are used to respectively simulate the connecting rod parts under different connecting rod ratio states. At the same time, after the external power is connected, the corresponding inner test piston unit 5 and the outer test piston unit 6 can receive the dynamic balance vibration and impact of the current corresponding inner connecting rod unit 3 or the outer connecting rod unit 4 on the gas inside the piston chamber during operation to analyze the use effect and stability of the connecting rod under different parameter design states when simulating the actual operation state. Among them, the parameters of each inner connecting rod unit 3 and each outer connecting rod unit 4 can be designed relatively independently and adjusted and used in combination according to the design requirements. During the test, the vibration parameters brought by each inner connecting rod unit 3 and the outer connecting rod unit 4 can be obtained separately, and the overall result can be output as a whole.

[0078] From the above, it can be seen that the engine crankshaft connecting rod swing dynamic balancing test equipment used in the present invention can complete the dynamic balance test of connecting rod simulation parts with different connecting rod ratios in swing and motion states, effectively realize the collection and output of test parameters of the connecting rod simulated motion state, and effectively provide a reference basis for the reasonable design of the actual crank connecting rod; this equipment can also achieve the purpose of simulating the matching of the current inner connecting rod unit 3 and the outer connecting rod unit 4 with the processed or tested connecting rod parameters by adjusting the variable diameter unit, and rely on this equipment to complete the predictive simulation test of motion dynamic balance.

[0079] The inner connecting rod unit 3 and the outer connecting rod unit 4 designed in the engine crankshaft connecting rod swing dynamic balancing test equipment of the present invention can be adjusted as needed and achieve the purpose of adjusting their respective parameters, so as to achieve the test of the engine operation balance under simulated multiple connecting rod ratios, effectively test the secondary imbalance effect brought by different connecting rod ratios in actual movement and complete the collection and external transmission and feedback of parameters; the entire engine crankshaft connecting rod swing dynamic balancing test equipment relies on the regulation of the corresponding variable diameter connecting rod assembly to effectively realize the rapid regulation of the connecting rod ratio of different connecting rods in the current engine, and at the same time, after the adjustment, it can ensure that the connecting rod ratio remains relatively unchanged during operation, reducing the adverse effects such as length changes caused by the random vibration of the variable diameter connecting rod assembly; wherein, the variable diameter connecting rod assembly can adjust its respective lengths as needed according to the actual test requirements during adjustment, effectively ensuring the synchronization of each inner connecting rod unit 3 and the outer connecting rod unit 4 during operation after adjustment, and avoiding the occurrence of motion dead points and motion interference.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the protection scope of the present invention.

[0081] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Engine crankshaft connecting rod swing dynamic balance test equipment, characterized by: The crankshaft comprises a left end for connecting to a flywheel, and a right end for connecting to power, a journal portion of a crank throw at the left end of the crankshaft and a journal portion of a crank throw at the right end of the crankshaft are both limited in fixed-axis rotation by bearings, inner connecting rod units are respectively mounted on the outer side walls of the connecting rod journal sections of the two connecting rod cranks in the middle of the crankshaft, outer connecting rod units are respectively symmetrically arranged on the outer sides of the inner connecting rod units, an inner test piston unit and an outer test piston unit are respectively fixedly arranged above the inner connecting rod units and the outer connecting rod units, each of the inner test piston units is respectively movably hinged to the top of the inner connecting rod unit at its corresponding position, and each of the outer test piston units is respectively movably hinged to the top of the outer connecting rod unit at its corresponding position; The inner test piston unit comprises a first test cylinder arranged vertically, in which a first piston is mounted in cooperation with a first piston cavity of the first test cylinder; the outer test piston unit comprises a second test cylinder arranged vertically, in which a second piston is mounted in cooperation with a second piston cavity of the second test cylinder; The inner connecting rod unit and the outer connecting rod unit both adopt a reducer connecting rod assembly with the same structure; the reducer connecting rod assembly includes a small-head connecting rod located at the top, a large-head connecting rod is arranged at intervals directly below the small-head connecting rod, the lower end of the large-head connecting rod is movably sleeved on the outer side wall of the crankshaft journal at its corresponding position, the top of the small-head connecting rod is movably hinged to the bottom of the first piston or the bottom of the second piston at its corresponding position, and reducer units are arranged on the small-head connecting rod and the large-head connecting rod, and the reducer unit is used to control the interval length between the small-head connecting rod and the large-head connecting rod and the current center of gravity adjustment of the reducer connecting rod assembly; The reducer unit comprises two studs which are relatively spaced and vertically arranged, the upper end of each stud moves through the bottom of the small-head connecting rod and extends into the upper through-hole, the lower end of each stud moves through the top of the large-head connecting rod and extends into the lower through-hole, upper locking nuts are respectively screwed on the external threaded side walls of the studs in the upper through-hole and below the small-head connecting rod, the two upper locking nuts cooperate to lock the bottom of the small-head connecting rod, lower locking nuts are respectively screwed on the external threaded side walls of the studs in the lower through-hole and above the large-head connecting rod, the two lower locking nuts cooperate to lock the top of the large-head connecting rod; A center of gravity adjusting member is installed in the middle of the variable diameter unit, and the center of gravity adjusting member adjusts the center of gravity of the corresponding inner connecting rod unit or the outer connecting rod unit by controlling its own lifting and lowering; The center of gravity adjusting part includes two counterweight steel nuts which are screwed together on the outer side walls of the corresponding studs, and the two counterweight steel nuts maintain synchronous adjustment or locking; a plurality of magnetic holes are arranged at intervals on the side wall planes of each counterweight steel nut, and strong magnetic counterweight parts are symmetrically installed on the front and rear sides of the two counterweight steel nuts, and the inner sides of the strong magnetic counterweight parts are fixedly installed in each magnetic hole; the strong magnetic counterweight part includes a strong magnetic block arranged on one side of the two counterweight steel nuts, the inner side wall of the strong magnetic block is magnetically fixed to the outer side wall plane of the counterweight steel nut, and a protrusion is integrally formed on the inner side wall of each strong magnetic block, and each protrusion is interference fit and installed in the corresponding magnetic hole; a counterweight block is fixedly installed in the middle of the outer side wall of each strong magnetic block.

2. The engine crankshaft connecting rod swing dynamic balance test equipment according to claim 1, characterized in that: The inner test piston unit cooperates with the outer test piston unit to implement dynamic balance vibration testing of the inner connecting rod unit and the outer connecting rod unit in different length states during operation.

3. The engine crankshaft connecting rod swing dynamic balance test equipment according to claim 2, characterized in that: The lower part of the first piston is movably hinged to the top of the inner connecting rod unit corresponding to the lower part thereof, and a first top cover is fixedly and sealingly installed at the top opening of the first test cylinder, and the top of the first top cover is fixedly installed on the bottom of the rigid frame, and a first strain type pressure sensor is fixedly installed on the bottom of the first top cover, and the first strain type pressure sensor is used for monitoring the gas vibration inside the first piston chamber and feeding back the parameters to the external control system.

4. The engine crankshaft connecting rod swing dynamic balance test equipment according to claim 3, characterized in that: The lower part of the second piston is movably hinged to the top of the outer connecting rod unit corresponding to the lower part thereof, and a second top cover is fixedly and sealingly installed at the top opening of the second test cylinder, and the top of the second top cover is fixed to the bottom of the rigid frame, and a second strain type pressure sensor is fixedly installed at the bottom of the second top cover, and the second strain type pressure sensor is used for monitoring the gas vibration inside the second piston chamber and feeding back the parameters to the external control system.

5. The engine crankshaft connecting rod swing dynamic balance test equipment according to claim 4, characterized in that: An upper through cavity is arranged in the middle of the small-end connecting rod, and a lower through cavity is arranged in the middle of the large-end connecting rod. The upper end of the diameter-changing unit extends into the upper through cavity, and the lower part of the diameter-changing unit extends into the lower through cavity.

6. The engine crankshaft connecting rod swing dynamic balance test equipment according to claim 5, characterized in that: An upper locking piece is arranged on one side of two adjacent upper locking nuts; and a lower locking piece is arranged on one side of two adjacent lower locking nuts.

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