一种带阻尼降噪结构的粉末冶金齿轮
By designing a split damping cover and damping shock absorption device, the compatibility and noise reduction issues of powder metallurgy gears are solved, achieving convenient assembly and effective noise and vibration suppression, making it suitable for the automotive, home appliance, and engineering machinery industries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANGZHOU MAPRUI POWDER METALLURGY CO LTD
- Filing Date
- 2025-12-10
- Publication Date
- 2026-07-17
AI Technical Summary
Existing traditional noise reduction structures for powder metallurgy gears have poor adaptability, are cumbersome to assemble, and cannot effectively suppress radial and axial vibrations of the gear web. After long-term use, the damping material is prone to falling off, resulting in limited noise reduction effect.
The damping cover adopts a split design and is fixed by flange lugs. The damping cover is equipped with sound-absorbing cotton and damping and shock absorption devices, including guide rods, rubber damping blocks and damping springs, forming a dual noise reduction mechanism. The sound-absorbing cotton is bonded with high-temperature resistant adhesive. The damping cover half ring is made of cold-rolled thin steel plate, the guide rod is made of stainless steel, the rubber damping block is made of oil-resistant nitrile rubber, and the damping spring is made of spring steel.
It achieves seamless adaptation and convenient assembly, effectively absorbs gear operating noise and vibration, the damping material is easy to replace, the noise reduction effect is significant, and it avoids the impact on gear strength and transmission efficiency.
Smart Images
Figure CN224515853U_ABST
Abstract
Claims
1. A powder metallurgy gear with a damped noise reduction structure comprising a gear (1), characterized in that: The gear (1) is made of iron-based powder metallurgy material by pressing and sintering. Its gear ring has an involute tooth shape and the tooth surface is carburized and quenched. The center of the gear (1) has a hub with a mounting hole for cooperating with the drive shaft. The outer side of the gear (1) is fitted with a damping cover (2). The damping cover (2) is an overall ring structure and is divided into two half rings, left and right, along the axial direction of the gear (1). Each half ring has a flange lug (3) with bolt holes integrally formed at both ends. The flange lug (3) and the end face of the half ring are connected. Vertically set, the bolt holes penetrate through the thickness direction of the flange lugs (3), a layer of sound-absorbing cotton (4) is attached to the inner side wall of the damping cover (2), the sound-absorbing cotton (4) is tightly bonded to the inner wall of the damping cover (2) by high temperature resistant adhesive, and the edge of the sound-absorbing cotton (4) is flush with the semi-circular end face of the damping cover (2). Four damping damping devices (5) are evenly arranged in the inner circumferential direction of the damping cover (2), and the damping damping devices (5) are set along the axial direction of the damping cover (2) and correspond to the web of the gear (1). The damping and shock absorption device (5) includes a guide rod (501). One end of the guide rod (501) is fixed to the inner wall of the damping cover (2) and is aligned with the radial direction of the damping cover (2). A rubber damping block (502) is provided at the end of the guide rod (501) away from the inner wall of the damping cover (2). The rubber damping block (502) has a central hole that matches the guide rod (501). The end of the guide rod (501) away from the inner wall of the damping cover (2) is inserted into the central hole of the rubber damping block (502). The rubber damping block (502) extends away from the guide rod (501) to fit tightly against the web surface of the gear (1). A damping spring (503) is also sleeved on the outside of the guide rod (501). One end of the damping spring (503) abuts against the mounting end face of the guide rod (501) connected to the inner wall of the damping cover (2), and the other end extends along the axial direction of the guide rod (501) and abuts against the end face of the rubber damping block (502) near the guide rod (501). The damping spring (503) is in a slightly compressed state.
2. The powder metallurgy gear with a noise reduction structure of damping according to claim 1, characterized in that: The damping cover (2) half ring is made of cold-rolled thin steel plate, and the edges of the plate are rounded.
3. The powder metallurgy gear with a noise reduction structure of damping according to claim 1, characterized in that: The flange lug (3) is a rectangular metal sheet, the diameter of the bolt hole is adapted to the outer diameter of the locking bolt, and the inner wall of the bolt hole is chamfered.
4. The powder metallurgy gear with a noise reduction structure of damping according to claim 1, characterized in that: The sound-absorbing cotton (4) is made of polyester fiber and has a porous structure on its surface. The thickness of the sound-absorbing cotton (4) is not greater than the wall thickness of the half ring of the damping cover (2), and the outer surface of the sound-absorbing cotton (4) does not extend beyond the radial outer surface of the damping cover (2).
5. The powder metallurgy gear with a noise reduction structure of damping according to claim 1, characterized in that: The guide rod (501) is a cylindrical metal rod made of stainless steel. The guide rod (501) is fixed to the inner wall of the damping cover (2) by welding. The weld is polished to ensure a smooth surface.
6. The powder metallurgy gear with a noise reduction structure of damping according to claim 1, characterized in that: The rubber damping block (502) has a cylindrical structure and is made of oil-resistant nitrile rubber.
7. The powder metallurgy gear with a noise reduction structure of damping according to claim 1, characterized in that: The damping spring (503) is a cylindrical spiral spring made of spring steel, the inner diameter of the damping spring (503) is slightly larger than the diameter of the guide rod (501), and the damping spring (503) can be stably sleeved outside the guide rod (501), and the wire diameter of the damping spring (503) matches the diameter of the guide rod (501), so as to meet the elastic support requirement of damping buffering.