A 132 cylinder diameter single cylinder engine bottom horizontal balance system

Abstract

The present invention discloses a 132 cylinder diameter single cylinder engine bottom horizontal balancing system, comprising a crankshaft lower case for installing a balancing shaft, two primary balancing shafts and two secondary balancing shafts are hinged on the left and right sides of the crankshaft lower case, the primary balancing shaft and the secondary balancing shaft are semicircular eccentric balancing shafts, and are arranged directly below the crankshaft, the two primary balancing shafts and the two secondary balancing shafts are symmetrically arranged with the crankshaft axis as the center line, the left ends of the primary balancing shaft and the secondary balancing shaft are connected with gears, and each adjacent two gears are meshed with each other. The present invention has high efficiency, compact structure, stable transmission ratio, high reliability, can more effectively eliminate vibration, and ensure the stable operation of the single cylinder engine.

Description

Technical Field

[0001] The invention relates to the technical field of single-cylinder engines, in particular to a bottom-mounted horizontal balancing system for a single-cylinder engine with a cylinder diameter of 132. Background Art

[0002] The 132 cylinder diameter single cylinder engine is a high power, high speed single cylinder diesel engine. During its operation, due to the uneven reciprocating speed of the piston, crankshaft and other moving parts, it will cause great vibration to the whole engine body.

[0003] During the operation of the 132 cylinder diameter single cylinder engine, the reciprocating speed of the piston is not uniform. When the piston runs to the top dead center or the bottom dead center, the speed is zero; when it is in the middle of the top and bottom dead centers, the speed is the highest. As the piston reciprocates in the cylinder, it will inevitably generate a large inertial force at the piston, piston pin, and connecting rod, causing the single cylinder engine to produce a large vibration, especially at higher speeds, the performance is more obvious. Although the counterweight of the connecting rod can balance part of the inertial force, its balancing effect is not ideal.

[0004] The existing chain drive is used to drive the balance shaft to rotate by the crankshaft. The layout position of the balance system is determined according to the overall layout of the machine, and its space occupancy rate is relatively large. The balance system using gear drive is arranged on the side of the crankshaft to save space. Therefore, the existing chain drive balance system and gear drive balance system are only suitable for small mechanical equipment, and are not suitable for large single-cylinder engines with high power and high speed; the transmission efficiency of the chain drive balance system is lower than that of the gear drive; the chain will wear out after long-term use, and it is easy to jump teeth; the chain drive is not suitable for use in load changes that are large and rapid reverse transmission. The gear drive balance system arranged on the side of the crankshaft saves space, and the balance shaft is designed to be relatively thin and the structure is relatively complex, which is not suitable for use in high-power, high-speed single-cylinder engines. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a 132-cylinder single-cylinder engine bottom-mounted horizontal balancing system with high efficiency, compact structure, stable transmission ratio, high reliability, and more effective vibration elimination to ensure its stable operation.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A lower horizontal balancing system for a 132-cylinder engine comprises a crankshaft lower case for mounting a balancing shaft, two primary balancing shafts and two secondary balancing shafts are hingedly connected on the left and right sides of the crankshaft lower case, the primary balancing shaft and the secondary balancing shaft are semicircular eccentric balancing shafts, and are arranged directly below the crankshaft, the two primary balancing shafts and the two secondary balancing shafts are symmetrically arranged with the crankshaft axis as the center line, the left ends of the primary balancing shaft and the secondary balancing shaft are connected with gears, and every two adjacent gears are meshed with each other.

[0008] A further improvement of the technical solution of the present invention is that four mounting holes are arranged on the left and right side walls of the crankshaft lower case, a limiting slot is arranged in the mounting hole of the left side wall of the crankshaft lower case, and a limiting retaining ring is installed in the limiting slot, a bearing sleeve is installed in the mounting hole of the right side wall of the crankshaft lower case by bolts, and a limiting step is arranged on the left side of the inner ring of the bearing sleeve.

[0009] A further improvement of the technical solution of the present invention lies in that a first-level balancing shaft bearing and a second-level balancing shaft bearing are interference-fitted on the left and right sides of the first-level balancing shaft and the second-level balancing shaft, respectively, and the bearing on the left side is interference-fitted with the mounting hole on the left side of the crankshaft lower case, the bearing on the right side is interference-fitted with the bearing sleeve, and a first-level balancing shaft gear is installed on the left side of the first-level balancing shaft bearing, and a second-level balancing shaft gear is installed on the left side of the second-level balancing shaft bearing.

[0010] A further improvement of the technical solution of the present invention lies in that: the first-level balancing shaft includes a first-level balancing shaft A and a first-level balancing shaft B, and the first-level balancing shaft B is also equipped with a first-level balancing shaft gear located on the left side of the first-level balancing shaft bearing. In addition, a transmission gear is also installed on the left side of the first-level balancing shaft gear of the first-level balancing shaft B, and the transmission gear is fixed to the first-level balancing shaft gear by bolts. The left and right ends of the first-level balancing shaft and the second-level balancing shaft are respectively provided with clamping nuts to clamp the first-level balancing shaft gear, the transmission gear and the second-level balancing shaft gear on the left side and the bearing on the right side.

[0011] A further improvement of the technical solution of the present invention is that the mounting surfaces on the left sides of the primary balancing shaft and the secondary balancing shaft for mounting the primary balancing shaft gear and the secondary balancing shaft gear are conical surfaces.

[0012] A further improvement of the technical solution of the present invention is that a mounting platform is provided on the left side of the crankshaft lower case and above the two middle mounting holes, and an idler gear meshing with the transmission gear is installed on the mounting platform.

[0013] A further improvement of the technical solution of the present invention is that the secondary balancing shaft is located at the front and rear sides of the primary balancing shaft and is arranged symmetrically.

[0014] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0015] The balancing shaft adopts a combination of a primary balancing shaft and a secondary balancing shaft, and is arranged directly below the crankshaft. The two primary balancing shafts and the two secondary balancing shafts are symmetrically arranged in the crankshaft lower box with the crankshaft axis as the center line. At the same time, the balancing shaft is also a semi-circular eccentric balancing shaft. The two adjacent balancing shafts are driven by the balancing shaft gear meshing, so that the disadvantages of chain transmission and tooth jumping will not occur. Compared with the gear-driven balancing system arranged on the side of the crankshaft to save space, the balancing shaft of the balancing system of the present invention has higher strength and simpler structure, and is more suitable for use in high-power, high-speed single-cylinder engines. It has high efficiency, compact structure, stable transmission ratio and high reliability.

[0016] A limiting slot is set in the mounting hole on the left side of the crankshaft lower case, and a limiting retaining ring is set in the limiting slot, so as to limit the axial displacement of the balance shaft and the bearing on the left side. The bearing sleeve on the right side of the crankshaft lower case has a limiting step, so as to prevent axial movement of the bearing, thereby enhancing the stability and reliability of the overall structural transmission.

[0017] The mounting surfaces on the left sides of the primary balancing shaft and the secondary balancing shaft for mounting the primary balancing shaft gear and the secondary balancing shaft gear are conical surfaces, thereby preventing the gears and shafts from loosening. At the same time, the left and right sides of the primary balancing shaft and the secondary balancing shaft are tightened by tightening nuts to tighten the balancing shaft gear on the left and the bearing on the right, which is convenient for disassembly and assembly, thereby facilitating future maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an assembly diagram of the balancing system of the present invention;

[0019] Figure 2 is a schematic structural diagram of a balance shaft of the present invention;

[0020] Figure 3 It is a schematic diagram of the combined assembly of the balance shaft and the gear of the present invention;

[0021] Figure 4 It is a schematic diagram of the installation structure of the balancing system of the present invention;

[0022] Among them, 1. Secondary balance shaft bearing, 2. Primary balance shaft bearing, 3. Secondary balance shaft, 4. Primary balance shaft A, 5. Secondary balance shaft gear, 6. Primary balance shaft gear, 7. Transmission gear, 8. Pressing nut, 9. Mounting table, 10. Bearing sleeve, 11. Primary balance shaft B, 12. Limiting ring, 13. Idle gear, 14. Crankshaft lower box. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with embodiments:

[0024] like Figure 1 As shown, a lower horizontal balancing system for a 132-cylinder engine includes a crankshaft lower case 14 for installing a balancing shaft. Two primary balancing shafts and two secondary balancing shafts 3 are hinged on the left and right sides of the crankshaft lower case 14 and are arranged directly below the crankshaft. The two primary balancing shafts and the two secondary balancing shafts 3 are symmetrically arranged with the crankshaft axis as the center line. At the same time, the primary balancing shaft and the secondary balancing shaft 3 adopt semicircular eccentric balancing shafts so that each level of balancing shaft can provide opposite forces when rotating, thereby reducing the vibration generated by the single-cylinder engine during operation.

[0025] Four mounting holes are provided on the left and right side walls of the crankshaft lower case 14, and the primary balance shaft and the secondary balance shaft 3 are hinged in the mounting holes. The mounting holes on the left side of the crankshaft lower case 14 are provided with limit slots, and limit retaining rings 12 are installed in the limit slots, so as to limit the axial displacement of the balance shaft and the left bearing. The mounting holes on the right side of the crankshaft lower case 14 are all installed with bearing sleeves 10 by bolts, and the left side of the inner ring of the bearing sleeve 10 is provided with a limit step, so as to prevent the bearing from axial movement, so as to enhance the stability and reliability of the overall structural transmission.

[0026] The left and right sides of the primary balancing shaft and the secondary balancing shaft 3 are respectively interference fit with the primary balancing shaft bearing 2 and the secondary balancing shaft bearing 1, and the bearing on the left side is interference fit with the mounting hole on the left side of the crankshaft lower box 14, and the bearing on the right side is interference fit with the bearing sleeve 10. The primary balancing shaft is installed with a primary balancing shaft gear 6 located on the left side of the primary balancing shaft bearing 2, and a secondary balancing shaft gear 5 is installed on the left side of the secondary balancing shaft bearing 1. At this time, in order to prevent the gears and shafts from loosening, the mounting surfaces on the left sides of the primary balancing shaft and the secondary balancing shaft 3 for installing the primary balancing shaft gear 6 and the secondary balancing shaft gear 5 are set as conical surfaces.

[0027] like Figure 3 Combined with Figure 4 As shown, the first-stage balancing shaft includes a first-stage balancing shaft A4 and a first-stage balancing shaft B11. In addition to the first-stage balancing shaft gear 6 located on the left side of the first-stage balancing shaft bearing 2 installed on the first-stage balancing shaft B11, a transmission gear 7 is also installed on the left side of the first-stage balancing shaft gear 6 of the first-stage balancing shaft B11, and the transmission gear 7 is fixed to the first-stage balancing shaft gear 6 by bolts.

[0028] In addition, a mounting platform 9 is provided on the left side of the crankshaft lower case 14 and above the two middle mounting holes, and an idler wheel 13 meshing with the transmission gear 7 is installed on the mounting platform 9, so that after the single-cylinder engine is started, the crankshaft rotates to drive the crankshaft gear, and the idler wheel 13 meshing with it also rotates accordingly, and at the same time drives the transmission gear 7, driving the various levels of balance shaft gears to rotate accordingly, so that the balance shaft rotates to provide a reaction force to reduce the vibration of the single-cylinder engine.

[0029] like Figure 3 Combined with Figure 4 As shown, in order to enhance the overall stability and ensure the strength of the installation, clamping nuts 8 are respectively provided at the left and right ends of the primary balance shaft and the secondary balance shaft 3 to clamp the primary balance shaft gear 6, the transmission gear 7 and the secondary balance shaft gear 5 on the left side and the bearing on the right side. The clamping nuts 8 are used for fastening, which is convenient for disassembly and assembly, thereby facilitating future maintenance work.

[0030] The installation method is as follows:

[0031] First, combine the primary balance shaft A4 and the primary balance shaft bearing 2 through interference fit; then insert it into the mounting hole on the right side of the crankshaft lower case 14, and the primary balance shaft bearing 2 and the mounting hole on the left side of the crankshaft lower case 14 are interference fit; at the same time, install the limit retaining ring 12 into the limit card groove of the mounting hole on the left side of the crankshaft lower case 14 to limit the axial displacement of the balance shaft and the bearing; combine the bearing sleeve 10 with the mounting hole on the right side of the crankshaft lower case 14 and fix it with bolts; install the primary balance shaft bearing 2 into the inner hole of the bearing sleeve 10, which is an interference fit, and the mounting hole of the bearing sleeve 10 retains a limit step during processing to prevent the bearing from axial movement;

[0032] Install the first-level balancing shaft gear 6 to the journal of the first-level balancing shaft A4. The mounting surface is a conical surface to prevent the gear and shaft from loosening. At the same time, tighten the clamping nuts 8 on both sides of the balancing shaft to compress the first-level balancing shaft gear 6 on the left side of the balancing shaft and the first-level balancing shaft bearing 2 on the right side of the balancing shaft. The installation of the first-level balancing shaft A4 is now completed. The installation of the first-level balancing shaft B11 is the same, except that a transmission gear 7 needs to be fixed on the left side of the first-level balancing shaft gear 6 by bolts.

[0033] The installation of the secondary balancing shaft 3 is to first combine the secondary balancing shaft bearing 1 with the left mounting hole of the crankshaft lower case 14 through interference fit; then insert the secondary balancing shaft 3 into the mounting hole on the right side of the crankshaft lower case 14, and then install the secondary balancing shaft bearing 1. The bearing mounting hole of the crankshaft lower case 14 retains a limit step during processing to prevent the bearing from axial movement; install the secondary balancing shaft 3 gear to the secondary balancing shaft 3 journal, and the mounting surface is a conical surface to prevent the gear and shaft from loosening; at the same time, tighten the clamping nuts 8 on both sides of the balancing shaft to compress the secondary balancing shaft gear 5 on the left side of the balancing shaft and the secondary balancing shaft bearing 1 on the right side of the balancing shaft. The installation of the secondary balancing shaft 3 is now completed.

[0034] After the single-cylinder engine is started, the crankshaft rotates to drive the crankshaft gear, and the idler gear 13 meshing with it also rotates, while driving the transmission gear 7, driving the various gears of the balance shaft to rotate, so that the balance shaft rotates to provide a reaction force to reduce the vibration of the single-cylinder engine.

[0035] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A 132 cylinder diameter single cylinder engine bottom horizontal balancing system, comprising a crankshaft lower case (14) for mounting a balancing shaft, two primary balancing shafts and two secondary balancing shafts (3) being hingedly connected on the left and right sides of the crankshaft lower case (14), characterized in that: The first-level balancing shaft and the second-level balancing shaft (3) are semicircular eccentric balancing shafts and are arranged directly below the crankshaft. The two first-level balancing shafts and the two second-level balancing shafts (3) are symmetrically arranged with the crankshaft axis as the center line. The left ends of the first-level balancing shaft and the second-level balancing shaft (3) are connected to gears, and each two adjacent gears are meshed with each other. The left and right side walls of the crankshaft lower case (14) are each provided with four mounting holes, and the mounting holes on the left side wall of the crankshaft lower case (14) are each provided with a mounting hole. A limit slot is provided, and a limit retaining ring (12) is installed in the limit slot; a bearing sleeve (10) is installed in the mounting hole on the right side wall of the crankshaft lower case (14) by bolts, and a limit step is provided on the left side of the inner ring of the bearing sleeve (10); the left and right sides of the first-level balancing shaft and the second-level balancing shaft (3) are respectively interference-fitted with a first-level balancing shaft bearing (2) and a second-level balancing shaft bearing (1), and the left side bearing is interference-fitted with the mounting hole on the left side of the crankshaft lower case (14), and the right side bearing is The bearing is interference fit with the bearing sleeve (10), and a first-level balancing shaft gear (6) is installed on the left side of the first-level balancing shaft bearing (2), and a second-level balancing shaft gear (5) is installed on the left side of the second-level balancing shaft bearing (1); the first-level balancing shaft includes a first-level balancing shaft A (4) and a first-level balancing shaft B (11), and the first-level balancing shaft B (11) is also installed with a first-level balancing shaft gear (6) located on the left side of the first-level balancing shaft bearing (2); in addition, a transmission gear (7) is also installed on the left side of the first-level balancing shaft gear (6) of the first-level balancing shaft B (11), and the transmission gear (7) is fixed to the first-level balancing shaft gear (6) by bolts; the left and right ends of the first-level balancing shaft and the second-level balancing shaft (3) are respectively provided with clamping nuts (8) so as to clamp the first-level balancing shaft gear (6), the transmission gear (7) and the second-level balancing shaft gear (5) on the left side and the bearing on the right side; the second-level balancing shaft (3) is located on the front and rear sides of the first-level balancing shaft and is arranged symmetrically.

2. According to claim 1, a 132 cylinder diameter single cylinder engine bottom horizontal balance system is characterized by: The mounting surfaces on the left sides of the primary balancing shaft and the secondary balancing shaft (3) for mounting the primary balancing shaft gear (6) and the secondary balancing shaft gear (5) are conical surfaces.

3. According to claim 1, a 132 cylinder diameter single cylinder engine bottom horizontal balance system, characterized in that In: A mounting platform (9) is also provided on the left side of the crankshaft lower case (14) and above the two middle mounting holes. An idler wheel (13) meshing with the transmission gear (7) is mounted on the mounting platform (9).

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