Periodic modification method for reciprocating mechanical transmission gear

Abstract

The invention relates to a periodic modification method for a reciprocating mechanical transmission gear, which is characterized in that the non-meshing surface of the transmission gear is modified to form a meshing clearance, and the meshing surface is not subjected to clearance modification. The gear backlash on the meshing side of the gear is eliminated to prevent the gear from being knocked in the return stroke due to the alternate change of positive and negative torque, the non-meshing side is modified to form the gear backlash to prevent the interference seizure phenomenon in the gear transmission process, and after modification, the gear transmission can achieve the state of more stable operation and lower vibration noise. The transmission gear is especially suitable for transmission gears of piston connecting rod reciprocating motion machines such as Stirling engines and diesel engines.

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. It is widely used in diesel engines, Stirling engines, gas turbines and other fields. It is the core component of the transmission system. 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. In a working cycle, the direction of the torque on the transmission gear changes alternately between positive and negative. Although the use of conventional modified gears can ensure normal operation, there are 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 slippage. 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 bite, making it impossible to transmit speed. In order to avoid the phenomenon of gear bite, the conventional gears have backlash after the tooth surfaces on both sides are modified (see Figure 1 , 2). Considering that the transmission gears of reciprocating machinery are subjected to alternating positive and negative torques in one operating cycle, some of the front teeth of the gears are meshed, some of the rear teeth of the gears are meshed, and the remaining part is a transition gear. When the positive and negative power are converted, the gears will knock in the return clearance, generating additional vibration noise. This has a great impact on equipment that has requirements for vibration noise. Summary of the invention

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

[0005] The objective 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, and 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 when the positive and negative torques of the gear 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, when positive and negative torques alternate, transitional modification is applied to the transmission gear teeth to form transitional tooth sides.

[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 the reciprocating mechanical transmission gear, the present invention only performs tooth surface modification on the non-meshing surface and does not perform tooth surface modification on the meshing surface, thereby reducing the machining accuracy requirements and simplifying the machining process.

[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 It is a schematic diagram of conventional gear meshing under positive torque;

[0017] Figure 2 It is a schematic diagram of conventional gear meshing under negative torque;

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

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

[0020] Figure 4 A schematic diagram showing the comparison between 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 reverse meshing line, 6 is the positive meshing point, 7 is the reverse meshing point, 8 is the return clearance, 9 is the positive meshing surface, and 10 is the reverse meshing surface. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[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 change alternately. A clearance is still left on the non-meshing side to prevent interference and seizure during the gear transmission process. After the periodic shaping, the gear transmission can achieve a state of stable operation, low vibration and noise, and the absence of knocking can also improve the life of the gear to a certain extent.

[0024] Ideally, the backlash of the unmodified gear is zero. The gear meshes in pure rolling motion without slip. Figure 3 As shown, the pinion is the active gear 1 and the large gear is the passive gear 2. During operation, when the pinion transmits a positive torque to the large gear, the positive meshing surfaces 9 of the pinion and the large gear mesh; when the pinion transmits a reverse torque to the large gear, the reverse meshing surfaces 10 of the pinion and the large gear mesh. Since there is no tooth side clearance, there is no disengagement between the gears during the conversion of the positive and reverse torques, and no return knocking will occur. However, interference will occur between gears without tooth side clearance, and the gear surfaces will be stuck, making it impossible to transmit the speed.

[0025] Figure 1 This is a schematic diagram of conventional gear meshing under positive torque. Figure 2 The figure is a schematic diagram of conventional gear meshing under negative torque. The tooth surface of conventional gears is modified to leave side clearance on both sides. This avoids interference between gears and generates return clearance. When the driving gear is in the alternating positive and negative torque, it is equivalent to the relative sliding of the pitch circles of the two gears, and collision occurs between the teeth, generating vibration. The transmission gears of some reciprocating machines will experience alternating positive and negative torque in each operating cycle, resulting in gear collision, such as Figure 2 , 3 shown.

[0026] Figure 4 Schematic diagram comparing 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, some have meshing tooth surfaces on the right, and the remaining gears are transition gears. The transmission gear is periodically modified. Under positive torque drive, the non-meshing surface on the rear side of the gear teeth is modified to form a tooth side clearance; under negative torque drive, the non-meshing surface in front of the gear teeth is modified to form a tooth side clearance. When positive and negative torques alternate instantaneously, transitional 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 for gap.

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 on the return stroke when the positive and negative torques of the gears change alternately, while leaving a clearance on the non-meshing side to prevent interference and seizure during the gear transmission process.

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 gear teeth is modified to form tooth side clearance.

5. The periodic modification method for a reciprocating mechanical transmission gear according to claim 1, characterized in that: At the instant when positive and negative torques alternate, transitional modification is applied to the transmission gear teeth to form transitional tooth sides.

6. The periodic modification method for a reciprocating mechanical transmission gear according to claim 1, characterized in that: The gear modification method is used for reciprocating mechanical transmission gears.

7. The periodic modification method for a reciprocating mechanical transmission gear according to any one of claims 1 to 6, characterized in that: After periodic shaping, the gear transmission can achieve a state of smooth operation, low vibration and noise, and no knocking phenomenon, which can increase the life of the gear.

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