NTN 4T-32204 Single Row Tapered Roller Bearing (Inside Dia - 20mm, Outside Dia - 47mm)
|Type of Product :||Single Row Tapered Roller Bearing|
|Inside Diameter (d) (mm) :||20|
|Outside Diameter D (mm) :||47|
|Width Dia mm :||18|
|Model No :||4T-32204|
1. Types, design features, and characteristics
Tapered roller bearings are designed so the tapered vertex of the raceway surfaces of the inner and outer rings and rollers converge at one point on the centerline of the bearing (see Fig. 1).
The tapered rollers are guided by the compound force of the inner and outer raceway surfaces which keep the rollers pressed up against the large rib on the inner ring.
A large variety of these bearings, including single, double, and four row arrangements, are available in both metric and inch series. Each
type and associated characteristics are shown in Table 1. For four-row tapered roller bearings, see section “C. Special application bearings.”
Table 1 Tapered roller bearing types and characteristics
|Single row tapered
(1) There are both metric and inch series adhering to the standards shown in the following table. Dimension series
＊Dimension series previously not covered by 3XX are regulated under JIS B 1512; dimensions previously missing from 3XX will henceforth use the bearing number.
(2) In addition to the standard design, there are also medium contact angle and large contact angle types, denoted by the contact angle codes at the end of the part numbers (C and D, respectively).
|Single row tapered
(4) These bearings are constructed to have a high capacity for radial loads, axial loads, and combined loads. The larger the contact angle, the greater the axial load capacity. When a pure radial load is applied to a tapered roller bearing, an induced load in the axial direction is also generated, so these bearings are generally used in pairs.
|Duplex tapered roller bearings||
(1) When two single-row tapered roller bearings are to be used in combination, the bearing clearance and preload are adjusted by the inner ring spacer or the outer ring spacer (see Fig. 4).
|Double row tapered
(1) Back-to-back arrangement (using double row outer rings) and face-to-face arrangement (using double row inner rings) are both available. The assemblies have been adjusted so that each type's internal clearance values are fixed. Only parts with identical manufacturing numbers can be used and they must be assembled according to their code numbers. (Refer to Fig. 5)
2. Standard cage type
In general, pressed cages (see Fig. 6) are used in tapered roller bearings. For large sized bearings, machined or pin type cages may also be used, while resin cages may also be used for smaller sized bearings.
3. Allowable misalignment
In order to avoid edge loading and potential for premature failure, the maximum allowable misalignment based on bearing series can be found below.
The allowable misalignment of combined bearings is influenced by the load center position, so please consult NTN Engineering.
• Single row (standard) …………… 1/ 2 000
• Single row (ULTAGE) …………… 1/ 600
If bearing load is light during operation, or if the ratio of axial to radial load for duplex and double row bearings exceeds the value of e, slipping may develop between the rollers and raceway surface, sometimes resulting in smearing. The mass of rollers and cages particularly tends to be large for large tapered roller bearings. For additional details, please contact NTN Engineering.
In tapered roller bearings, the cage may protrude beyond the inner and/or outer ring side faces. Care should be taken when designing the housing and shaft to ensure contact with the cage does not occur.
We have a 30-day return policy. Returns are limited to items purchased within 30 days and are subject to a 25% restocking fee.
Items must be unworn, unused, with tags and in original packaging to be eligible for return. A receipt or proof of purchase is also required.
To initiate a return, please contact firstname.lastname@example.org If your item is eligible for a return, you will be credited 75% of the original purchase price, not including any shipping costs. Please contact your sales professional to request an RMA (Return Materials Request) as only returns bearing an RMA will be received. All items must be in new saleable condition in the original packaging. Credits will be issued once the item has been received and inspected.
If you have any questions regarding returns or exchanges, please contact email@example.com
damage and problems
Please inspect your order upon receipt and if the item is defective or damaged, or if you have received the wrong item, please contact us immediately so that we can evaluate the problem and deal with it properly.
Unfortunately we do not accept returns on non-policy items, discount items or gift cards.
The fastest way to get the item you want is to return the item you have and purchase a new item separately once the return has been accepted.
After we receive and inspect your return, we will notify you and let you know if a refund has been approved. If approved, your original payment method will be automatically refunded. Remember, it may take a while for your bank or credit card company to process and post your refund.