A fast debugging method for a connecting rod linear motion engine and its linkage mechanism

Abstract

The present invention provides a method for quickly debugging a connecting rod linear motion engine and its linkage mechanism, wherein the crankshaft of the engine is sleeved with a roller bearing on the connecting rod journal, a conversion frame surrounds the outer side of the roller bearing and forms a sliding connection with the roller bearing, one end of the connecting rod is fixedly connected to the piston, and the other end is inserted into the fixed screw seat of the conversion frame through a screw head to form a threaded connection, and a bayonet for a wrench to be inserted is provided on the connecting rod. The connecting rod of the engine only performs reciprocating linear motion when working, and does not need to perform reciprocating swing, so the vibration and noise of the whole machine will be greatly reduced, and maintenance will be more convenient; and the machine can compensate for the machining errors of the crankshaft and connecting rod parts by adjusting the slight changes in the length of the connecting rod, and has low requirements for the manufacturing, processing, installation and debugging of the parts. When quickly adjusting the linkage mechanism of the engine, the entire linkage mechanism can be adjusted to the state of the optimal motion clearance by simply performing a simple tension-quantitative relaxation adjustment on the connecting rod.

Description

Technical Field

[0001] The invention relates to a reciprocating piston engine, in particular to a connecting rod linear motion engine and a rapid debugging method of a crankshaft, a connecting rod and a piston linkage mechanism thereof, belonging to the technical field of engines. Background Art

[0002] In a reciprocating piston engine, the linkage mechanism consisting of the crankshaft, connecting rod and piston is the core mechanism of the engine. However, the crankshaft, connecting rod and piston of the traditional structure engine still have many shortcomings that are difficult to overcome during the manufacturing, assembly and use process, which are mainly reflected in:

[0003] (1) The crankshaft, connecting rod and piston parts of traditional engine structures are complex in design and require high precision in manufacturing, installation and debugging. The manufacturing, processing, installation and debugging operations require highly skilled workers to concentrate their minds under good environmental conditions. In particular, for multi-cylinder engines, the parameters of the connection between the crankshaft, connecting rod and piston of each cylinder need to be highly unified. In order to achieve high uniformity, all the processes of crankshaft processing need to be completed in one go, but this also increases the difficulty of processing and the scrap rate. Therefore, it is difficult to achieve high uniformity in the crankshaft, connecting rod and piston linkage mechanism of traditional engine structures, whether in manufacturing or installation and debugging. Even experienced senior technicians can only perform installation and debugging within a certain error range. Moreover, the error must be re-matched each time installation and debugging is performed, and it cannot be replicated. Once the manufacturing and processing error is too large, it will become scrap, which not only affects the quality of the engine, but also affects the life of the engine, and increases the manufacturing cost.

[0004] (2) The connecting rod of a traditional engine is hinged on the crankshaft and piston at both ends. In addition to driving the piston to reciprocate, the connecting rod also swings with the rotation of the crankshaft. The swing of the connecting rod and the crankshaft will form a superposition of vibrations, increase the motion noise, and also cause some power loss. In addition, in order to allow the connecting rod to swing, the connecting rod needs to be hinged on the piston and crankshaft at both ends. The hinged joint of the connecting rod needs to be lubricated, which will also cause wear and noise, resulting in reduced work efficiency and noise pollution to the environment. Summary of the invention

[0005] In order to solve the above-mentioned shortcomings, the present invention provides a connecting rod linear motion engine, which adopts a crankshaft, connecting rod and piston linkage mechanism of a new structure. This linkage mechanism can be easily manufactured, processed, installed and debugged, and the connecting rod only performs reciprocating linear motion, which can reduce vibration and noise. The connection points no longer use hinges, and maintenance is more convenient.

[0006] The specific technical scheme of the present invention is:

[0007] A connecting rod linear motion engine, which is provided with a body, on which a crankshaft, a conversion frame, a connecting rod, a piston and a cylinder are arranged; main journals are provided at both ends of the crankshaft, and the main journals are rotatably supported in the body through support bearings, and at least one pair of crank units with a phase difference of 180° is fixedly connected between the head and tail main journals, and each crank unit is provided with a pair of parallel cranks, and an eccentrically arranged connecting rod journal is connected between the two parallel cranks, and a roller bearing that can rotate in situ is fixedly sleeved on the connecting rod journal; the conversion frame is provided with two vertically parallel and spaced sliding plates, and grooves are provided on the opposing surfaces of the two sliding plates, and a horizontal pull rod is respectively connected to the upper and lower ends of the two sliding plates, and a frame is formed by the two sliding plates and the two pull rods and surrounds the outer side of the roller bearing of the crankshaft connecting rod journal, and the grooves of the two sliding plates clamp the roller bearing in the middle, and the roller bearing can be rotated between the two The cam is secured to the cylinder with a plurality of camshafts, each of which is secured to a plurality of camshafts, each of which is secured to a plurality of camshafts, each of which is secured to a plurality of camshafts, each of which is secured to a plurality of camshafts, each of which is secured to a plurality of camshafts, each of which is secured to a plurality of camshafts, each of which is secured to a plurality of camshafts, each of which is secured to a plurality of camshafts, each of which is secured to a plurality of camshafts,

[0008] Furthermore, a flywheel is fixedly connected to the end of the main journal at the rear end of the crankshaft, and the inertia of the flywheel makes the operation of the entire linkage mechanism more stable and enables the piston to pass the top dead center smoothly.

[0009] Furthermore, the pull rod of the conversion frame adopts an adjustable screw assembly to facilitate the adjustment of the distance between the two sliding plates, thereby controlling the sliding clearance between the roller bearing and the slide groove.

[0010] Furthermore, the crankshaft, conversion frame, connecting rod and piston are all installed externally on the outside of the machine body to facilitate subsequent installation, commissioning and maintenance.

[0011] Based on the structure and connection mode of the crankshaft, connecting rod and piston linkage mechanism of the connecting rod linear motion engine, a method for quickly debugging the linkage mechanism includes the following steps:

[0012] (1) Positioning: An initial positioning point M and an elastically retractable swing collision point N are set on the engine body corresponding to each connecting rod bayonet. The connecting rod's axis point is O. The angle between the line connecting the NO point and the line connecting the MO point is θ. The value of θ is the rotation angle value that the connecting rod needs to swing and relax after the connecting rod is rotated and tensioned at the corresponding piston top dead center, when the linkage mechanism of the crankshaft, connecting rod and piston needs to restore the optimal state of free movement. This value is determined by the factory after testing.

[0013] (2) Tensioning: Turn one crankshaft unit to make its corresponding piston move to the top dead center position at the maximum distance from the crankshaft's rotation center. Use a matching special wrench to insert it into the connecting rod's slot and rotate the connecting rod in the forward direction so that the piston is pushed to the deepest part of the cylinder and is in a tensioned state. Then withdraw the wrench. At this time, the linkage mechanism of the crankshaft, connecting rod and piston is in a completely tensioned state and cannot move.

[0014] (3) Quantitative relaxation: Align the handle of the wrench with the initial positioning point M and maintain the alignment state. Re-insert the wrench into the slot of the connecting rod, rotate the connecting rod in the opposite direction until the handle of the wrench touches the rotation collision point N, and then tighten the locking screw to lock the connecting rod. The linkage mechanism of the crankshaft, connecting rod and piston is relaxed according to the preset quantitative state to the optimal state where it can move freely. This completes the debugging of the crank unit linkage mechanism.

[0015] (4) Repeat steps (2) and (3) for the linkage mechanisms of other crank units on the crankshaft until the linkage mechanisms of all crank units are debugged one by one.

[0016] Compared with the engine of the traditional structure, the novel engine of the present invention has the following advantages:

[0017] (1) The crankshaft and connecting rod of the traditional engine will swing when working. The swing of both will cause imbalance superposition. The crankshaft part can achieve balance by symmetry, but it is difficult to achieve symmetry in the connecting rod part. Therefore, the vibration source of the whole machine is mainly in the connecting rod. The connecting rod of this engine is connected to the roller bearing on the crankshaft through the conversion frame, so that the connecting rod only makes reciprocating linear motion when working, and does not need to make reciprocating swing. Therefore, the vibration and noise of the whole machine will be greatly reduced. In addition, since the connecting rod only makes reciprocating linear motion, the connection between the connecting rod and the piston and the conversion frame is fixed, and the connection point is no longer hinged, so there is no wear and no need for lubrication, which is more convenient for maintenance.

[0018] (2) The various parameters of the crankshaft, connecting rod, and piston linkage mechanism of the traditional structure engine need to be highly unified, and the precision requirements for manufacturing, installation and debugging are very high. The manufacturing and processing of parts are difficult, and the errors must be re-matched each time installation and debugging are performed. They cannot be simply copied, and the installation and debugging operations are complicated. However, the engine of the present invention is based on the improved structure and connection method of the crankshaft, connecting rod, and piston. The processing errors of the crankshaft and connecting rod parts can be compensated by adjusting the slight changes in the length of the connecting rod (the processing error here refers to the phenomenon that the connection of the crankshaft, connecting rod, and piston is too tight or too loose due to the processing errors of the crankshaft and connecting rod). Moreover, by simply tightening and quantitatively relaxing the connecting rods of each cylinder, the movement coordination of the crankshaft, connecting rod, and piston linkage mechanism between each cylinder can be achieved in an accurate, uniform, and reproducible optimal state. Regardless of the processing errors of the crankshaft and connecting rod parts, or the increase in the movement clearance caused by long-term work wear, the entire linkage mechanism can be easily adjusted to the state of the optimal movement clearance by simply tightening and quantitatively relaxing the connecting rod. Moreover, it is a fool-proof operation and does not require high skills.

[0019] (3) The manufacturing and processing of the crankshaft, connecting rod and piston linkage mechanism of the engine of the present invention does not require high matching accuracy and does not require special equipment. Various parts can be manufactured independently and can be replaced individually after being damaged. The manufacturing and maintenance costs are low. After assembly, it only needs to be simply debugged using a quick debugging method before it can be used.

[0020] (4) The crankshaft, connecting rod and piston linkage mechanism of the conventional engine are wrapped inside the engine body, which makes installation and debugging difficult, especially maintenance, because the movement of the engine cannot be visually seen, and troubleshooting is difficult. Even if a small screw is loose inside the engine, the entire engine must be disassembled, which is time-consuming and increases costs. However, the crankshaft, connecting rod and piston linkage mechanism of the engine of the present invention are exposed and installed on the outside of the engine body, which is extremely convenient for installation and debugging. During maintenance, faults can be directly found and faulty parts can be replaced separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the connection structure of the engine crankshaft, conversion frame, connecting rod, piston and cylinder.

[0022] Figure 2 for Figure 1 Front view of.

[0023] Figure 3 for Figure 2 AA section view.

[0024] Figure 4 for Figure 1 Top view.

[0025] Figure 5for Figure 4 BB section view.

[0026] Figure 6 for Figure 1 Schematic diagram without the conversion frame, connecting rod, piston and cylinder.

[0027] Figure 7 A schematic diagram of the conversion framework.

[0028] Figure 8 Schematic diagram of the connecting rod and piston structure.

[0029] Fig. 9 This is a schematic diagram of the operation of quantitatively loosening and adjusting the connecting rod.

[0030] In the figure: 1-machine body, 2-crankshaft, 2.1-main journal, 2.2-crank, 2.3-connecting rod journal, 2.4-roller bearing, 3-conversion frame, 3.1-sliding plate, 3.2-pull rod, 3.3-fixing screw seat, 3.4-locking screw, 4-connecting rod, 4.1-screw head, 4.2-bayonet, 5-piston, 6-cylinder, 7-support bearing, 8-flywheel, 9-wrench. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] like Figure 1-8As shown, the engine is provided with a body 1, on which a crankshaft 2, a conversion frame 3, a connecting rod 4, a piston 5 and a cylinder 6 are provided. The crankshaft 1 is provided with a main journal 2.1 at both ends, and the main journal 2.1 is rotatably supported in the body 1 through a support bearing 7. At least one pair of crank units with a phase difference of 180° is fixedly connected between the head and tail main journals 2.1, and each crank unit is provided with a pair of parallel cranks 2.2, and an eccentrically arranged connecting rod journal 2.3 is connected between the two parallel cranks 2.2, and a roller bearing 2.4 that can rotate in situ is fixedly sleeved on the connecting rod shaft 2.3; the end of the main journal 2.1 at the tail end of the crankshaft 2 is also fixedly connected to a flywheel 8. The conversion frame 3 is provided with two vertically parallel sliding plates 3.1 which are spaced apart from each other. Grooves are provided on the opposing surfaces of the two sliding plates 3.1. A horizontal pull rod 3.2 is connected to the upper and lower ends of the two sliding plates 3.1. The two sliding plates 3.1 and the two pull rods 3.2 together form a frame and surround the outer side of the roller bearing 2.4 of the crankshaft connecting rod journal 2.3. The grooves of the two sliding plates 3.1 clamp the roller bearing 2.4 in the middle. The roller bearing 2.4 can slide up and down in the slide groove formed by the grooves of the two sliding plates 3.1. The conversion frame 3 is provided with a fixed screw seat 3.3 on the outer side surface of the middle part of a sliding plate 3.1; the pull rod 3.2 of the conversion frame 3 adopts an adjustable screw assembly. The cylinder 6 is arranged at a position corresponding to each crank unit of the crankshaft 2, and a piston 5 that can slide back and forth is arranged in the cylinder 6; the connecting rod 4 is a straight rod, one end of the connecting rod 4 is fixedly connected to the piston 5, and the other end of the connecting rod 4 is inserted into the fixed screw seat 3.3 of the conversion frame 3 through the screw head 4.1 to form a threaded connection, and the side of the fixed screw seat 3.3 is provided with a locking screw 3.4 for locking the connecting rod screw head 4.1, and the rod body of the connecting rod 4 is provided with a bayonet 4.2 for an open-end wrench to be inserted into; in this engine, when the air 6 takes turns to do work, the piston 5 pushes the connecting rod 4 and the conversion frame 3 to do linear reciprocating motion together, and the conversion frame 3 drives the crank unit to make a circular rotation by pushing the roller bearing 2.4 on the crank unit, thereby rotating the crankshaft 2, and the roller bearing 2.4 while following the crank unit to make a circular rotation, also makes a reciprocating up and down sliding in the conversion frame 3. The crankshaft 2, conversion frame 3, connecting rod 4 and piston 5 of the engine are all exposed and installed outside the engine body to facilitate subsequent installation, commissioning and maintenance.

[0033] Based on the structure and connection mode of the linkage mechanism of the crankshaft 2, the connecting rod 4, and the piston 5 of the connecting rod linear motion engine, a method for quickly debugging the linkage mechanism includes the following steps:

[0034] (1) Positioning: An initial positioning point M and an elastically retractable swing collision point N are respectively set on the engine body 1 on the side of each connecting rod bayonet 4.2. The axis point of the connecting rod 4 is O. The angle between the line connecting the NO point and the line connecting the MO point is θ. The value of θ is the rotation angle value of the connecting rod 4 that needs to be rotated and relaxed when the linkage mechanism of the crankshaft 2, the connecting rod 4 and the piston 5 is restored to the optimal state of free movement after the connecting rod 4 is rotated and tensioned at the corresponding top dead center of the piston 5. This value is determined by the factory after testing.

[0035] (2) Tensioning: Rotate one crank unit of the crankshaft 2 to move the corresponding piston 5 to the top dead center position at the maximum distance from the crankshaft rotation center. Use the matching special wrench 9 to clamp into the bayonet 4.2 of the connecting rod 4 and rotate the connecting rod 4 in the positive direction so that the piston 5 is pushed to the deepest part of the cylinder 6 and is in a tensioned state. Then withdraw the wrench 9. At this time, the linkage mechanism of the crankshaft 2, connecting rod 4 and piston 5 is in a completely tensioned state and cannot move.

[0036] (3) Quantitative relaxation: Fig. 9 As shown, align the handle of the wrench 9 with the initial positioning point M and maintain the alignment state to re-insert the wrench 9 into the bayonet 4.2 of the connecting rod 4, rotate the connecting rod 4 in the opposite direction until the handle of the wrench 9 hits the swing collision point N, and then tighten the locking screw 3.4 to lock the connecting rod 4, so that the linkage mechanism of the crankshaft 2, connecting rod 4, and piston 5 is relaxed according to the preset quantitative state to the optimal state where it can move freely, thereby completing the debugging of the crank unit linkage mechanism.

[0037] In this step, when the wrench 9 is re-inserted into the bayonet 4.2 of the connecting rod 4 and the handle of the wrench 9 cannot be completely aligned with the initial positioning point M, according to the positive and negative angle offset between the handle of the wrench 9 and the initial positioning point M, after the handle of the wrench 9 hits the rotation collision point N, a rotation correction corresponding to the offset is performed.

[0038] (4) Repeat steps (2) and (3) for the linkage mechanisms of other crank units on crankshaft 2 until the linkage mechanisms of all crank units are debugged one by one.

[0039] The above-mentioned figures are only typical embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for quickly debugging the crankshaft, connecting rod and piston linkage mechanism of a connecting rod linear motion engine, characterized in that: The connecting rod linear motion engine is provided with a body, on which a crankshaft, a conversion frame, a connecting rod, a piston and a cylinder are arranged; main journals are provided at both ends of the crankshaft, and the main journals are rotatably supported in the body through support bearings, and at least one pair of crank units with a phase difference of 180° is fixedly connected between the head and tail main journals, and each crank unit is provided with a pair of parallel cranks, and an eccentrically arranged connecting rod journal is connected between the two parallel cranks, and a roller bearing that can rotate in situ is fixedly sleeved on the connecting rod journal; the conversion frame is provided with two vertically parallel and spaced sliding plates, and grooves are provided on the opposing surfaces of the two sliding plates, and a horizontal pull rod is respectively connected to the upper and lower ends of the two sliding plates, and a frame is formed by the two sliding plates and the two pull rods and surrounds the outer side of the roller bearing of the crankshaft connecting rod journal, and the grooves of the two sliding plates clamp the roller bearing in the middle, and the roller bearing can be rotated in the two sliding plates. The cam is provided with a fixing screw seat on the outer side surface of the middle part of a sliding plate; the cylinder is arranged at a position corresponding to each crank unit of the crankshaft, and a piston that can slide back and forth is arranged in the cylinder; the connecting rod is a straight rod, one end of the connecting rod is fixedly connected to the piston, and the other end of the connecting rod is inserted into the fixing screw seat of the conversion frame through a screw head to form a threaded connection, and a locking screw for locking the connecting rod screw head is arranged on the side of the fixing screw seat, and a bayonet for an open-end wrench is arranged on the rod body of the connecting rod; when the cylinders of the engine work in turn, the piston pushes the connecting rod and the conversion frame to make a linear reciprocating motion together, and the conversion frame drives the crank unit to make a circular rotation by pushing the roller bearing on the crank unit, thereby rotating the crankshaft, and the roller bearing slides back and forth up and down in the conversion frame while following the crank unit to make a circular rotation; The method for quickly debugging the crankshaft, connecting rod and piston linkage mechanism of the connecting rod linear motion engine comprises the following steps: (1) Positioning: An initial positioning point M and an elastically retractable swing collision point N are respectively set on the side of each connecting rod bayonet on the engine body. The axis point of the connecting rod is O, and the angle between the line connecting the NO point and the line connecting the MO point is θ. The value of θ is the rotation angle value that the connecting rod needs to swing and relax after the connecting rod is rotated and tensioned at the corresponding piston top dead center, when the linkage mechanism of the crankshaft, connecting rod and piston needs to restore the optimal state of free movement. This value is determined by the factory after testing; (2) Tensioning: Turn one crankshaft unit to make its corresponding piston move to the top dead center position at the maximum distance from the crankshaft rotation center. Use a matching special wrench to clamp the connecting rod into the bayonet and rotate the connecting rod forward so that the piston is pushed to the deepest part of the cylinder and is in a tensioned state. Then withdraw the wrench. At this time, the linkage mechanism of the crankshaft, connecting rod and piston is in a completely tensioned state and cannot move. (3) Quantitative relaxation: Align the handle of the wrench with the initial positioning point M and maintain the alignment state, then re-insert the wrench into the bayonet of the connecting rod, rotate the connecting rod in the opposite direction until the handle of the wrench touches the swing collision point N, and then tighten the locking screw to lock the connecting rod, so that the linkage mechanism of the crankshaft, connecting rod and piston is quantitatively relaxed to the optimal state where it can move freely according to the preset quantity, and the debugging of the crank unit linkage mechanism is completed; (4) Repeat steps (2) and (3) for the linkage mechanisms of other crank units on the crankshaft until the linkage mechanisms of all crank units are debugged one by one.

2. The rapid debugging method according to claim 1, characterized in that: In step (3), when the wrench is reinserted into the slot of the connecting rod and the handle of the wrench cannot be completely aligned with the initial positioning point M, a rotation correction corresponding to the offset is performed after the handle of the wrench hits the rotation collision point N according to the positive and negative angle offset between the handle of the wrench and the initial positioning point M.

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