一种带螺旋油槽的粉末冶金轴套结构
By designing a spiral oil groove and an auxiliary oil injection device inside the powder metallurgy bushing, the problems of uniform lubricant flow and sealing are solved, achieving uniform lubricant coverage and reliable sealing, and extending the service life of the bushing.
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
Traditional powder metallurgy bushings lack a spiral oil groove design, which results in uneven flow of lubricating oil, creating lubrication blind spots, easy oil loss, and a lack of effective sealing structure, leading to increased wear and oil contamination.
The design incorporates a powder metallurgy bushing with spiral oil grooves, combined with an auxiliary oil injection device and an annular sealing groove, to achieve uniform distribution and sealing of lubricating oil. The spiral oil grooves extend to the end face of the bushing at both ends, reducing oil loss, and the annular sealing groove forms a double seal with the sealing ring to prevent leakage.
It achieves uniform coverage of lubricating oil, extends the lubrication cycle, reduces wear, improves structural stability and sealing reliability, avoids oil contamination, and enhances the wear resistance life of the bushing.
Smart Images
Figure CN224515685U_ABST
Abstract
Claims
1. A powder metallurgy bushing structure with spiral oil groove, comprising a bushing (1), characterized in that: The bushing (1) is a horizontally placed cylindrical hollow structure with a smooth cylindrical outer wall and a flat friction working surface on the inner wall. The bushing (1) is made of iron-based powder metallurgy material, which is formed by pressing and sintering. A spiral oil groove (2) is provided on the inner wall of the bushing (1). The spiral oil groove (2) extends spirally along the axial direction of the inner wall of the bushing (1) and adopts a single-head right-handed design. The cross-section of the spiral oil groove (2) is U-shaped, with smooth edges and no sharp corners. Its two ends extend to the two end faces of the bushing (1), and the groove opening is flush with the end face. An auxiliary oil injection device (3) is integrated on the side wall of the bushing (1). The auxiliary oil injection device (3) is fixedly connected to the side wall of the bushing (1), and its internal channel is connected to the spiral oil groove (2) on the inner wall of the bushing (1). The bushing (1) is equipped with an end cap (4) at each end. Both end caps (4) are annular discs made of aluminum alloy. Their disc surfaces are flat and smooth with rounded edges. An inner hole is opened in the center of the end cap (4). The diameter of the inner hole is matched with the outer diameter of the bushing (1). Several mounting holes are evenly opened at the edge of the end cap (4). The mounting holes penetrate the disc surface of the end cap (4). An annular boss (5) is provided on the inner side of the end cap (4) at one end of the bushing (1). The annular boss (5) is integrally formed with the end cap (4). The inner wall of the annular boss (5) is cylindrical and its height is matched with the thickness of the end of the bushing (1). A transmission fitting shaft (6) is inserted through the cylindrical hollow cavity of the bushing (1). The transmission fitting shaft (6) is arranged along the axial direction of the bushing (1). The auxiliary oil injection device (3) includes an oil injection port (301). The oil injection port (301) is a cylindrical tubular structure made of brass. The outer side of the tube has fine anti-slip textures, and the inner side is machined with stepped through holes. The through holes are divided into an oil injection inlet section, a valve core installation section, and an oil passage connection section from the outside to the inside. A sealing valve core (302) is installed in the valve core installation section of the oil injection port (301). The sealing valve core (302) is cylindrical and made of oil-resistant rubber. A ring-shaped sealing boss protrudes outward from the middle of the sealing valve core (302). The outer diameter of the boss matches the inner diameter of the valve core installation section of the oil injection port (301). A top ball (303) is provided inside the sealing valve core (302). The top ball (303) is a spherical structure. The structure is made of hard alloy and is embedded in the center of the sealing valve core (302). The bottom of the sealing valve core (302) is provided with a spring mounting groove. The groove is cylindrical and a return spring (304) is embedded in the spring mounting groove. The return spring (304) is arranged along the axial direction of the oil inlet (301). The end of the return spring (304) away from the sealing valve core (302) abuts against the limiting ring (305). The limiting ring (305) is assembled inside the oil inlet (301). Below the limiting ring (305) is an oil passage interface (306). The oil passage interface (306) is a tubular structure. One end is fixedly connected to the oil passage connection section of the oil inlet (301), and the other end is connected to the channel of the side wall of the bushing (1).
2. The powder metallurgy bushing structure with spiral oil groove according to claim 1, characterized in that: The two end faces of the bushing (1) are tightly fitted with the inner side surfaces of the two end caps (4) without any obvious gap. The end caps (4) with annular bosses (5) are fitted on the outer side wall of the bushing (1). The inner wall of the annular bosses (5) is tightly fitted with the outer wall of the bushing (1), forming a radial positioning constraint on the bushing (1). The two end caps (4) are bolted to the corresponding holes of the equipment base through the mounting holes on the edge. After the bolts are tightened, the two end caps (4) apply axial clamping force to the bushing (1) from both ends, fixing the bushing (1) between the two end caps (4) and restricting the bushing (1) from moving along the axial direction.
3. The powder metallurgy bushing with spiral oil groove according to claim 1, characterized in that: The transmission shaft (6) is a solid cylindrical structure made of high-strength alloy steel. The outer diameter of the transmission shaft (6) is precisely matched with the inner diameter of the bushing (1). After assembly, the shaft and the inner wall of the bushing (1) fit tightly but without interference.
4. The powder metallurgy bushing with spiral oil groove according to claim 1, characterized in that: The limiting ring (305) has an annular structure and is made of brass. It is fixed between the valve core mounting section and the oil passage connection section of the oil injector body by interference fit.
5. The powder metallurgy bushing structure with spiral oil groove according to claim 1, characterized in that: The inner wall of the bushing (1) near the two end faces has an annular sealing groove. The annular sealing groove is located on the outer side of the end of the spiral oil groove (2). The groove has a semi-circular cross-section and the groove depth and groove width are matched. Each annular sealing groove is fitted with a sealing ring (7). The sealing ring (7) is a rubber O-ring. Its outer diameter is matched with the groove diameter of the annular sealing groove, and its inner diameter is closely fitted with the outer diameter of the transmission shaft (6). After assembly, the inner ring of the sealing ring (7) forms an interference fit with the outer wall of the transmission shaft (6), and the outer ring is closely fitted with the annular sealing groove on the inner wall of the bushing (1) without any loose gap.
6. The powder metallurgy bushing structure with spiral oil groove according to claim 5, characterized in that: The sealing ring (7) is made of oil-resistant nitrile rubber. The ring body is elastic and uniform, and the surface is smooth and free of impurities. Its cross-sectional diameter matches the groove depth and groove width of the annular sealing groove. It can always maintain a tight fit with the bushing (1) and the transmission mating shaft (6) when they rotate relative to each other. The axial width of the sealing ring (7) is less than the axial length of the annular sealing groove and there is no part that exceeds the groove body.