CN213206488U

CN213206488U - Vibration reduction gear and engine thereof

Info

Publication number: CN213206488U
Application number: CN202021187380.1U
Authority: CN
Inventors: 黄第云
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-05-14
Anticipated expiration: 2030-06-23

Abstract

The utility model discloses a damping gear and engine thereof, including the gear body and locate the circumferential rubber strip in the gear body, the thickness b1 of rubber strip establishes to (0.2 ~ 0.8) H, and the width H1 of rubber strip establishes to (2 ~ 5) b1, and wherein, H is the thickness of gear body. The utility model discloses paste the rubber strip at the interior circumference of gear and reduce vibration and absorption noise.

Description

Vibration reduction gear and engine thereof

Technical Field

The utility model relates to the technical field of engines, especially, relate to a damping gear and engine thereof.

Background

The development of gear drives is moving towards high speed, heavy load, light weight, high precision and automation, which puts higher demands on their dynamic performance. The vibration and noise of the gear transmission are the main sources of vibration noise of many mechanical devices, and how to control the vibration noise has important influence on the precision, the performance, the service life and the labor protection of operators of the mechanical devices.

The control of gear transmission noise is a very complicated system engineering, and two methods of active vibration reduction and passive vibration reduction are mainly adopted to solve the problem at present, wherein the active vibration reduction mainly comprises methods of improving manufacturing precision, modifying tooth surface shape and the like, although the meshing condition of the gear is improved by considering the structural parameters of the optimal gear such as tooth shape, pressure angle and the like during active design, the meshing impact, time-varying rigidity and the like of the gear cannot be avoided, and the active vibration reduction method can bring the defects of greatly improving manufacturing cost, increasing design calculation amount and the like. Among passive vibration damping techniques, damping vibration damping with viscoelastic materials is most widely used.

How to solve the problems of vibration reduction and noise reduction and realizing the industrial application of the gear transmission system have important significance.

During gear transmission, in order to ensure that a normal lubricating oil film is formed between tooth surfaces and prevent the gear from being clamped due to thermal expansion deformation caused by the rise of the working temperature of the gear, backlash is inevitably generated between gear pairs, and the rotation speed fluctuation of a driving gear and the backlash between the gears are important reasons and conditions for causing gear knocking.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a damping gear and engine thereof pastes the rubber strip on the surface of gear and lowers vibration and absorption noise.

The utility model discloses take following technical scheme to realize above-mentioned purpose:

a damping gear comprises a gear body and a rubber strip arranged on the inner circumferential surface of the gear body, wherein the thickness b1 of the rubber strip is set to be (0.2-0.8) × H, the width H1 of the rubber strip is set to be (2-5) × b1, and H is the thickness of the gear body.

Preferably, the gear body is preferably a drive gear.

Preferably, the rubber strip is annular, and the annular rubber strip is matched with the inner circumferential surface of the gear body.

Preferably, the rubber strips are arranged in a strip shape, the number of the rubber strips is at least two, and the at least two rubber strips are symmetrically arranged along the center of the gear body.

An engine comprising a damper gear as described above disposed on the engine.

The utility model has the advantages that:

1. the utility model discloses a damping gear and engine thereof pastes the rubber strip at the interior circumference of gear, reaches the effect of reducing vibration and absorbed noise.

2. The rubber strip is made of oil-resistant rubber and has excellent hot air aging resistance and impact elasticity.

3. The fluctuation of the rotating speed of the driving gear is the most important condition for generating knocking, and the rubber strip is arranged on the driving gear, so that the vibration reduction effect is better.

Drawings

Fig. 1 is a front view of a vibration reduction gear provided in embodiment 1 of the present invention;

fig. 2 is a side view of a damper gear according to embodiment 1 of the present invention;

fig. 3 is a side view of a damper gear according to embodiment 2 of the present invention.

In the figure, 1 is a gear body, and 2 is a rubber strip.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings 1-3 and the detailed description thereof.

Example 1

Referring to fig. 1-2, the present embodiment provides a damping gear, including a gear body 1 and a rubber strip 2 disposed on an inner circumferential surface of the gear body 1, wherein a thickness b1 of the rubber strip 2 is set to (0.2-0.8) × H, and a width H1 of the rubber strip 2 is set to (2-5) × b1, where H is the thickness of the gear body 1.

The utility model discloses a damping gear sets up rubber strip 2 through the surface at gear body 1 when using, reaches the purpose of reducing vibration and absorption noise. The selection of the thickness and the width of the rubber strip 2 ensures the normal working state between the gears, and achieves the maximum vibration reduction and noise reduction effects.

In the present embodiment, the thickness b1 of the rubber strip 2 is set to 0.5 × H, and the width H1 of the rubber strip 2 is set to 3.5 × b 1.

In this embodiment, the rubber strip 2 is installed on the inner circumferential surface of the gear body 1 by a vulcanization process or a press-in process, so that the knocking vibration and noise of the gear body 1 can be effectively reduced.

In the present embodiment, the gear body 1 is preferably a driving gear. Because the fluctuation of the rotating speed of the driving gear is the most important condition for generating knocking, the rubber strip 2 arranged on the driving gear can ensure that the vibration reduction effect is better.

The rubber strip 2 is made of oil-resistant rubber and has excellent hot air aging resistance and impact elasticity. The oil-resistant rubber is preferably ethylene propylene diene monomer rubber. The hardness of the rubber strip 2 is 50-75 Shore (A), and the performance of the rubber strip 2 is guaranteed to be optimal. In the present embodiment, the hardness of the rubber strip 2 is 60 shore (a).

In the present embodiment, the rubber strip 2 is provided in a ring shape, and the ring-shaped rubber strip 2 is fitted to the inner circumferential surface of the gear body 1.

In this embodiment, the inner circumferential surface of the gear body 1 is provided with an installation groove, and the rubber strip 2 is installed in the installation groove in an interference fit manner. The degree of depth of mounting groove and the thickness adaptation of rubber strip 2 make rubber strip 2 ability fixed mounting in the mounting groove. The outer side surface of the rubber strip 2 can be positioned on the same plane with the inner circumferential surface of the gear body 1, and can also protrude out of the inner circumferential surface of the gear body 1. The width of mounting groove and the width adaptation of rubber strip 2.

The utility model also discloses an engine, including setting up on the engine as above the damping gear.

Example 2

Referring to fig. 3, the present embodiment is the same as embodiment 1 except that the shape of the rubber strip 2 and the installation manner thereof are different.

In this embodiment, the rubber strip 2 is set to be a strip, the rubber strip 2 is at least two, and the at least two rubber strips 2 are symmetrically arranged along the center of the gear body 1. In this embodiment, rubber strip 2 is established to eight, and eight rubber strips 2 set up along the central symmetry of gear body 1, ensure the rotational stability of gear body 1, alleviate the wearing and tearing of rubber strip 2 simultaneously.

In the present embodiment, the rubber strip 2 is directly vulcanization-fixedly mounted on the inner circumferential surface of the gear body 1. The outer side surface of the rubber strip 2 protrudes out of the inner circumferential surface of the gear body 1.

Right the utility model discloses a thickness and width that rubber strip 2 is different among the damping gear have tested data such as vibration frequency, noise and rubber degree of wear respectively, reach table 1 and table 2, as follows:

TABLE 1 rubber strip test data for different thicknesses

Thickness of rubber strip	Vibration acceleration of gear (m/s ^2)	Noise of gear (dB (A))	Degree of wear of rubber
				0.1H	18	97	Slight abrasion
0.2H	17	96.5	Is normal
				0.5H	16	95.5	Is normal
0.8H	16.2	96	Is normal
				0.9H	16.5	96.5	Is normal

TABLE 2 rubber strip test data for different widths

Width of rubber strip	Vibration acceleration of gear (m/s ^2)	Noise of gear (dB (A)	Degree of wear of rubber
				1b1	17.9	96.5	Slight abrasion
2b1	17.5	96.5	Is normal
				3b1	16.5	96	Is normal
4b1	16	95.5	Is normal
				5b1	16.2	95.8	Is normal
6b1	16.3	96	Is normal

As can be seen from table 1, when the thickness b1 of the rubber strip 2 was set to 0.1H, both the vibration frequency and noise of the gear were slightly large, and the rubber strip was easily worn. When the thickness b1 of the rubber strip 2 is within the range of (0.2-0.8) × H, the vibration frequency and the noise of the gear are relatively small, and the abrasion degree of the rubber is normal. When the thickness b1 of the rubber strip 2 was set to 0.9H, the vibration frequency and noise of the gear started to increase. In addition, the higher the cost is required as the thickness of the rubber strip 2 increases. It follows that the thickness b1 of the rubber strip 2 is reasonably in the range of (0.2-0.8) × H.

As can be seen from table 2, when the width h1 of the rubber strip 2 is set to 1b1, both the vibration frequency and the noise of the gear are slightly large, and the rubber strip 2 is easily worn. When the width h1 of the rubber strip 2 is within the range of (2-5) × b1, the vibration frequency and the noise of the gear are relatively small, and the abrasion degree of the rubber is normal. When the width h1 of the rubber strip 2 is set to 6b1, the vibration frequency and noise of the gear start to increase. In addition, the width of the rubber strip 2 is not larger than that of the gear, so that material waste is avoided, and cost is increased. Therefore, the width h1 of the rubber strip 2 is reasonable within the range of (2-5) × b 1.

Although the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The damping gear is characterized by comprising a gear body (1) and a rubber strip (2) arranged on the inner circumferential surface of the gear body (1), wherein the thickness b1 of the rubber strip (2) is set to be (0.2-0.8) H, the width H1 of the rubber strip (2) is set to be (2-5) b1, and H is the thickness of the gear body (1).

2. A vibration-reducing gear according to claim 1, characterised in that the gear body (1) is preferably a driving gear.

3. A vibration-damping gear according to claim 1, characterized in that the rubber strip (2) is provided in the form of a ring, and the ring-shaped rubber strip (2) is fitted to the inner circumferential surface of the gear body (1).

4. The vibration reduction gear according to claim 1, characterized in that the rubber strips (2) are strip-shaped, the number of the rubber strips (2) is at least two, and the at least two rubber strips (2) are symmetrically arranged along the center of the gear body (1).

5. An engine comprising a damper gear according to any one of claims 1 to 4 provided on the engine.