Specifications

Excavator bearings RNAV4008
1.Gcr15 material
2.Bear radial load
3.Used in machinery
4.ISO:9001:2000

Excavator bearings needle roller RNAV4008

Overview of Excavator bearings RNAV4008

Drawn cup needle roller bearings support radial loads and reduce friction between rotating components, with a drawn outer shell serving as a raceway for the rollers. The low cross section of the drawn cup bearing provides high load-carrying capability with minimum required space. Drawn cup bearings are easily installed with a press fit in the housing.

Needle roller bearings are roller bearings with cylindrical rollers that are small in diameter. In spite of their low cross section, needle roller bearings have a high load carrying capacity and are therefore extremely suitable for bearing arrangements where radial space is limited.

As for the full complement needle roller bearing with inner ring, the outer ring has the oil hole. The lubricating oil can be fed in from the oil hole. The outer ring has the double shoulders. As for the full complement needle roller bearing without inner ring, since the inner ring has no shoulder and cage, the inner ring, outer ring, complete set of needles can be mounted respectively. It is s suitable for parts of which the radial size is limited.
The surface of shaft journal fitted with it is acted directly as rolling surface. It is requested that the surface hardness be no less than HRC60, surface roughness, no more than 0.63μm. This kind of full complement bearing, with inner ring or without inner ring, does not limit the axial shift of shaft and housing.

Specifications of Excavator bearings RNAV4008

 

 

 

Shaft Diameter(mm)	51.6
Bearing Designation	RNAV4008
Mass Approx(g)	4084108
Fw(mm)	304
D(mm)	51.6
C(mm)	68
Cr Dynamic(N)	28
Cor Static(N)	49900
Oil(rpm)	137900

 

 

 

Advantages of  Excavator bearings RNAV4008

- Smaller cross-section leading to greated rigidity,higher load-carrying capacity & lower inertia of the needle roller bearings help size and weight reductions in machinery.

- Though they are less wide,their load carrying capacity is high and is most suitable for applications where the load is high & the radial space is less.

- Needle roller bearings,which are designed to withstand oscillation can operate under severe conditions & interchange with sliding bearings

Physical Characteristic of  Excavator bearings RNAV4008

	1)   needle bearing can be separated by single row.
	2)  This kind of bearing can be submitted to high radial load and some axial load.
	3)  The rolling element of needle roller bearing is needle,the two ends of the external lines have  the corrective slope which can eliminate the contact stress.
	4) Moreover, we can manufacture these bearings according  to customer's drawings and samples

 

Applications:

- Transmissions,transfer cases,engines & valve trains

-Steering and braking systems

- Axle support

-Outboard engines

 

Expanded Options

- Assemblies with bearings

- Engineered polymer cages

- Bearings with one or two seals

-Closed end bearings

- Oil holes

-Drawn sleeve

Bearing Classification		Bearing No. Size	Range
Drawn Cup Needle Roller Bearings	Caged Type	HK BK HK..RS HK..2RS BK..RS	ID4-50mm
	One Way Type	HF HFL	ID4-35mm
	Full Complement Type	FFH MF MFH FY MFY	ID6-60mm
Radial Needle and Cage Assemblies	Single & double row type	K/KS KK/KKS KZK KBK	ID5-110mm
	Long cylindrical roller Type	KNL	ID19.051-74mm
Needle Roller Bearings	With Ribs	NK NKS RNA49 RNA48	ID5-160mm
		NKI NKIS NA49 NA48	ID8-140mm
		RNA69 NA69	ID5-140mm
		RNA49..RS RNA49..2RS NA49..RS NA49..2RS	ID5-140mm
	Without Ribs	RNAO NAO	ID5-100mm
	Aligning	RPNA PNA	ID15-45mm
	Full Complement	RNAV NAV	ID15-04.8mm
Yoke Type Track Rollers	Without Axial Guidance	RSTO RSTO..X STO STO..X RNA22..2RS RNA22..2RSX NA22..2RS NA22..2RSX	ID5-50mm
	With Axial Guidance	NATR NATR..PP NATV NATV..PP NUTR NUTR..X	ID5-50mm
Stud Type Track Rollers	With Axial Guidance	KR KRE KR..PP KRE..PP	ID6-30mm
		KRV KRVE KRV..PP KRVE..PP	ID6-30mm
		NUKR NUKRE	ID16-30mm
Combined Radial Axial Bearings	Needle Roller Arugula Contact Ball Bearing	NKIA	ID12-70mm
		NKIB	ID12-70mm
	Needle Roller Axial Cylindrical Roller Bearing	ZARN	ID15-50mm
		ZARN..L	ID15-50mm
		NARF	ID15-50mm
		NARF..L	ID15-50mm
		NKXR	ID15-50mm
		NKXR..Z	ID15-50mm
	Needle Roller Axial Ball Bearing	NX NX..Z	ID7-35mm
		NKX NKX..Z	ID7-35mm
Inner Ring		IR LR	ID5-160mm
Axial Bearings	Axial Needle Roller And Cage Assembly	AXK AXW	ID4-160mm
Axial Bearings	Axial Cylindrical Roller And Cage Assembly	K811 K812 K893 K874 K894	ID15-160mm
Axial Bearing Washers	Shaft Locating Washers	AS WS811	ID4-160mm
	Housing Locating	Washers GS811	ID15-160mm
	Bearing Washers	LS	ID6-160mm
	Center Washers	ZS

 

Model numbers of needle bearings

Bearing No.	Boundary dimensions(mm)			Basic load ratings(N)
	Fw	D	C	Cr	Cor
RNAV4002	21.87	32	17	10800	29800
RNAV4003	24.3	35	18	17900	37900
RNAV4004	28.7	42	22	28150	60900
RNAV4005	33.5	47	22	33800	70800
RNAV4006	40.1	55	25	49900	96500
RNAV4007	45.9	62	27	47600	122800
RNAV4008	51.6	68	28	49900	137900
RNAV4009	57.4	75	30	52500	153500
RNAV4010	62.1	80	30	55700	166000
RNAV4011	69.8	90	35	68500	225800
RNAV4012	74.6	95	35	75400	239000