A method for periodic modification of a reciprocating machine drive gear

Abstract

The present application relates to a kind of periodic modification methods of reciprocating mechanical transmission gear, non-engagement surface of transmission gear is modified to form meshing gap, meshing surface is not modified to form gap. Eliminate the tooth side gap of gear meshing side to prevent gear from being knocked back by positive and negative torque alternation variation, non-engagement side is modified to form tooth side gap to prevent interference from appearing in the process of gear transmission Dead phenomenon, after modification, gear transmission can reach more stable operation, lower vibration and noise State, and there is no knocking phenomenon on gear life also has certain improvement, especially suitable for Stirling engine, diesel engine and other piston connecting rod reciprocating mechanical transmission gear.

Description

Technical Field

[0001] The invention relates to a reciprocating mechanical transmission gear, in particular to a periodic shaping method of a transmission gear. Background Art

[0002] Gear transmission is the most widely used form of mechanical transmission, widely used in diesel engines, Stirling engines, gas turbines and other fields. It is the core component of the transmission system, and its performance directly affects the performance and efficiency of the transmission device. The transmission gears of reciprocating machinery all use conventional modified gears. Compared with other types of mechanical equipment, some reciprocating machinery has its own unique transmission characteristics. During a working cycle, the direction of the torque applied to the transmission gear changes alternately between positive and negative. Although the use of conventional modified gears can ensure normal operation, it has the following shortcomings:

[0003] Ideal transmission gears have no backlash, that is, no return clearance. The counter-rotating pitch circles between the two gears perform pure rolling without slipping. When the positive and negative torques are converted, there is no disengagement and no return knocking. However, in reality, there will be interference between gears without backlash, and the gear surfaces will be stuck, making it impossible to transmit speed. In order to avoid the phenomenon of gear sticking, the tooth surfaces on both sides of the conventional gear are modified to have backlash (see Figure 1 2) Considering that the transmission gears of reciprocating machinery are subjected to alternating positive and negative torques during a single operating cycle, some gears have meshing front teeth, some have meshing rear teeth, and the remaining gears are transition gears. When the positive and negative power are switched, the gears experience backlash and knocking, generating additional vibration noise. This has a significant impact on equipment with high vibration noise requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a periodic shaping method for a reciprocating mechanical transmission gear, so as to solve the problem of large vibration and unstable operation of the reciprocating mechanical transmission gear.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A periodic modification method for a reciprocating mechanical transmission gear is provided, wherein the non-meshing surface of the transmission gear is modified to form a meshing gap, while the meshing surface is not modified for the gap.

[0007] Furthermore, the method eliminates the tooth side clearance on the meshing side of the gear to prevent the gear from knocking during the gear return stroke when the positive and negative torques alternate, while a clearance is still left on the non-meshing side to prevent interference and seizure during the gear transmission process.

[0008] Furthermore, under positive torque drive, the non-meshing surface on the rear side of the transmission gear teeth is modified to form a tooth side clearance.

[0009] Furthermore, under negative torque drive, the non-meshing surface in front of the transmission gear teeth is modified to form tooth side clearance.

[0010] Furthermore, at the instant of alternating positive and negative torques, the transmission gear teeth are subjected to transitional modification to form transitional tooth flanks.

[0011] Furthermore, the gear shaping method is used for reciprocating mechanical transmission gears.

[0012] Furthermore, the gear transmission after periodic shaping can achieve a state of smooth operation, low vibration and noise, and no knocking phenomenon, which can increase the life of the gear.

[0013] The beneficial effects of the present invention are:

[0014] 1. According to the working characteristics of reciprocating mechanical transmission gears, the present invention only performs tooth surface modification on the non-meshing surface and does not modify the meshing surface, thereby reducing the processing accuracy requirements and simplifying the processing technology.

[0015] 2. The transmission gear processed by the present invention runs more smoothly, has lower vibration and noise, and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of conventional gear meshing under positive torque;

[0017] Figure 2 Schematic diagram of conventional gear meshing under negative torque;

[0018] Figure 3 Schematic diagram of gear transmission with zero tooth backlash;

[0019] Among them: (a) is the main view, (b) is the enlarged view of the meshing part;

[0020] Figure 4 Schematic diagram comparing conventional shaping and periodic shaping;

[0021] In the figure: 1 is the driving gear, 2 is the driven gear, 3 is the pitch circle, 4 is the positive meshing line, 5 is the negative meshing line, 6 is the positive meshing point, 7 is the negative meshing point, 8 is the return clearance, 9 is the positive meshing surface, and 10 is the negative meshing surface. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] like Figure 3As shown in (a) and (b), an embodiment of the present invention provides a periodic shaping method for a reciprocating mechanical transmission gear. The tooth side clearance on the meshing side of the gear is eliminated by shaping to prevent the gear from knocking in the return stroke when the positive and negative torques of the gear alternately change, while a gap is still left on the non-meshing side to prevent interference and biting during the gear transmission process. After the periodic shaping, the gear transmission can achieve a state of stable operation and low vibration and noise, and the absence of knocking also improves the life of the gear to a certain extent.

[0024] Ideally, the backlash of the unmodified gear is zero. The gear meshing is pure rolling without slip, such as Figure 3 As shown, the pinion is the driving gear 1, and the gear is the driven gear 2. During operation, when the pinion transmits positive torque to the gear, the positive meshing surfaces 9 of the pinion and gear mesh; when the pinion transmits negative torque to the gear, the negative meshing surfaces 10 of the pinion and gear mesh. Because there is no backlash, there is no disengagement between the gears during forward and reverse torque conversion, and no return stroke knocking occurs. However, without backlash, gears may interfere with each other, causing the gear surfaces to seize and prevent speed transmission.

[0025] Figure 1 This is a schematic diagram of conventional gear meshing under positive torque. Figure 2 The diagram below shows conventional gears meshing under negative torque. Conventional gear tooth surfaces are modified to leave side clearance on both sides. This prevents interference between gears, but also creates a return clearance. When the driving gear is in alternating positive and negative torque, the pitch circles of the two gears slide relative to each other, causing collisions between the teeth and vibration. The transmission gears of some reciprocating machines experience alternating positive and negative torques in each operating cycle, resulting in gear collisions. Figure 2 、 3 shown.

[0026] Figure 4 A comparison diagram of conventional shaping and periodic shaping. The driving gear of a reciprocating engine is subjected to alternating positive and negative torques during operation. Some gears have meshing tooth surfaces on the left side, some have meshing tooth surfaces on the right side, and the remaining gears are transition gears. The transmission gear is subjected to periodic shaping. Under positive torque drive, the non-meshing surface on the rear side of the gear teeth is modified to form tooth side clearance; under negative torque drive, the non-meshing surface on the front side of the gear teeth is modified to form tooth side clearance. Positive and negative torques alternate instantaneously, and transition shaping is used, such as Figure 4 shown.

Claims

1. A periodic modification method for a reciprocating mechanical transmission gear, characterized in that: The non-meshing surface of the transmission gear is modified to form a meshing gap, and the meshing surface is not modified. The left tooth surface of some of the transmission teeth is meshing, the right tooth surface of some of the teeth is meshing, and the remaining part is transition teeth. When the positive and negative torques alternate instantaneously, the transmission teeth are subjected to transition modification to form transition tooth sides, and the transition modification removal amount gradually increases from the tooth root to the tooth top.

2. The periodic modification method for a reciprocating mechanical transmission gear according to claim 1, characterized in that: This method eliminates the tooth side clearance on the meshing side of the gear to prevent the gear from knocking during the return stroke when the positive and negative torques alternate, while leaving a gap on the non-meshing side to prevent interference and seizure during gear transmission.

3. The periodic modification method for a reciprocating mechanical transmission gear according to claim 1, characterized in that: Under positive torque drive, the non-meshing surface on the rear side of the transmission gear teeth is modified to form tooth side clearance.

4. The periodic modification method for a reciprocating mechanical transmission gear according to claim 1, characterized in that: Under negative torque drive, the non-meshing surface in front of the transmission teeth is modified to form tooth side clearance.

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