Sa mekanikal na istraktura ng paghahatid ng gear, ang paggamit ng mga ipinares na single-row tapered roller bearings ay naging mas karaniwan. Dahil maaari itong magdala ng parehong radial at axial load, maaari itong ilapat sa iba't ibang mga istraktura ng suporta sa tindig. Sinaliksik din nila ang iba't ibang mga form ng suporta para sa tapered roller bearings. Upang mapadali ang pagpupulong at pagsasaayos, ang single-row tapered roller bearings ay karaniwang pinaghihiwalay, iyon ay, ang panloob at panlabas na mga singsing ng tindig ay maaaring tipunin nang hiwalay, na kadalasang nangangailangan ng pagsasaayos ng panloob na clearance ng tindig sa panahon ng pagpupulong, at ang mga kinakailangan ng tapered bearing para sa clearance. Ito ay medyo malupit, at kung ang pagsasaayos ng clearance nito ay angkop ay direktang nauugnay sa panghuling pagganap ng pagpapatakbo at buhay ng serbisyo ng tindig.
1 Mga tampok ng tapered roller bearings
Ang tapered roller bearings ay may tapered na panloob at panlabas na mga raceway, na may tapered rollers na nakaayos sa pagitan ng mga ito. Ang mga inaasahang linya ng lahat ng tapered surface ay nagtatagpo sa parehong punto sa bearing axis, na ginagawang tapered roller bearings partikular na angkop para sa compound (radial at axial) load. Ang axial load capacity ng bearing ay kadalasang tinutukoy ng contact angle α. Kung mas malaki ang anggulo α, mas mataas ang kapasidad ng axial load. Ang anggulo ay kinakatawan ng coefficient ng pagkalkula e. Mas malaki ang applicability ng axial load. Ang panlabas na bilog (o panloob na bilog) ng isang double row tapered roller bearing ay isang integral.
Sa pangkalahatan, ang clearance ay itinakda bilang kinakailangan bago umalis sa pabrika, at walang kinakailangang pagsasaayos ng gumagamit. Para sa single-row tapered roller bearings, dahil sa kanilang mga separable na katangian, ang panloob at panlabas na mga singsing ay naka-install nang hiwalay, at kung ginagamit ang mga ito sa mga pares, ang bearing clearance ay kailangang ayusin ng gumagamit sa panahon ng pag-install.
2 Karaniwang pag-aayos ng ipinares na single row tapered roller bearings
Ang paired single-row tapered roller bearings ay independiyenteng sinusuportahan, sa pangkalahatan ay back-to-back o "O" na hugis na suporta, tulad ng ipinapakita sa Figure 1, dahil sa malaking hanay ng pagkarga nito at mahusay na katatagan ng suporta. Ang ipinares na single-row tapered roller bearing ay ginagamit bilang nakapirming dulo at ginagamit kasabay ng cylindrical roller bearing. Iyon ay, ang "X" type na suporta, tulad ng ipinapakita sa Figure 2. Ang single-row tapered roller bearings ay ipinamamahagi at sinusuportahan sa magkabilang dulo ng shaft o gear. Upang matiyak ang balanse ng karga, ang mga ito ay nakakonsentra sa gitnang linya ng baras at sinusuportahan nang magkahiwalay, tulad ng ipinapakita sa Figure 3.
"O" na hugis na suporta
Suporta sa uri ng "X".
Sinusuportahan nang harapan nang hiwalay
3 Mga kinakailangan sa clearance para sa ipinares na single row tapered roller bearings
Ang mga bearings ay karaniwang tinutukoy ang kanilang clearance sa pagtatrabaho ayon sa mga kondisyon ng pagtatrabaho na ginamit. Para sa mga karaniwang istruktura ng paghahatid, maaaring itanong ng mga gumagamit ang mga kinakailangan sa clearance ayon sa katalogo ng tindig. Gayunpaman, dahil sa mataas na pagganap at kumplikadong mga kondisyon sa pagtatrabaho, tulad ng wind power generation Gearboxes, atbp., ay inilalapat ng mga supplier ng bearing
Ayon sa pagkalkula, binabalangkas ng guro ang halaga ng clearance ng pagpapares ng tindig at ang mga teknikal na kinakailangan para sa pagsasaayos ng pagpupulong, at ginagabayan ang gumagamit upang makumpleto ang pag-install.
Taking the speed increase box as an example, in the structure of the speed increase box where the paired single-row tapered roller bearings are located, the low speed stage has a low speed and a large load. In order to improve the bearing capacity, the bearing clearance is controlled in a small range; Higher, the calorific value is large, the oil demand is sufficient, and the clearance is controlled at a larger value; however, the precise value should be given based on the comprehensive consideration of the expansion caused by the bearing temperature rise factor, the interference of the inner and outer rings, and the operating clearance requirements. final value.
4 Clearance measurement method of paired single row tapered roller bearings
As shown in Figure 4, according to factory practice, the matched bearing with back-to-back structure usually adjusts the inner spacer to control the clearance, so the actual wear value of the inner spacer A = H1 + H2 + C1 + ΔS
Schematic diagram of measured value of the matched bearing with back-to-back
In Figure 4, H1 , H2 are the drop values of the inner and outer rings of bearings 1 and 2 when they are laid flat; C1 is the basic value of the outer spacer; ΔS is the required working clearance. In this way, since multiple values need to be measured, and each value needs to be measured at multiple points on the circumference, and finally the average value is obtained, the workload is large and the production efficiency is low; it can be used in the prototype trial production stage, but Not conducive to mass production. Based on the experience of the production plant, as shown in Figure 5, the following batch measurement methods are adopted:
Schematic diagram of measurement mode of the matched bearing with back-to-back
The specific method is:
(1) Place a tapered roller bearing 1 on the flat plate after leveling, with the small end facing up, and place the machined outer spacer on the outer ring of bearing 1;
(2) Put another tapered roller bearing 2 on it with the small end facing down;
(3) Place a pressure block weighing about 100 kg (as shown in the figure, the pressure block is in the shape of a ring, hollow, which is convenient for the measuring ruler to enter and measure) on the inner ring of bearing 2, and start to rotate the outer ring of the two bearings for 10~20 circles to ensure that the two bearings are The inner and outer rings are in close contact with the tapered rollers;
(4) Measure the A1 value 4~6 times at the evenly distributed position on the circumference, and calculate the average value; then the wear distribution of the inner spacer to be processed is A=A1+ΔS (ΔS is the required working clearance value), and the tolerance control is ±0.025 mm; for the case where the single-row tapered roller bearings are arranged and used separately, the two bearings should be mounted on the component before adjusting the clearance, and the matching grinding value is obtained by measuring the distance from the end face of the outer ring of the bearing on the outside to the end face of the mounting hole . As shown in Figure 6, the method is as follows: First, the outer ring of the bearing should be compressed at multiple points in the circumferential direction of the pressure plate to ensure that the tapered roller and the inner and outer rings are fully fitted; secondly, the distance A2 in the circumferential direction is measured, and the average value is measured at multiple points. The grinding value A=A2+ΔS (±0.025 mm).
Separately arranged bearing measurement diagram
5 Formation mechanism of tapered roller bearing clearance
Working clearance calculation formula: ΔS = Sr - ΔSp - ΔST In the formula, ΔS is the radial working clearance (μm) of the normal warm bearing during operation; Sr is the internal radial clearance (μm); ΔSp is caused by the fit The reduction of radial clearance; ΔSp is the reduction of radial clearance due to temperature rise (μm). Reduction in radial clearance due to fit ΔSp: Radial clearance
The reduction in clearance is due to the expansion of the inner ring and the contraction of the outer ring during installation.
ΔSp = Δd + ΔD
Δd ≈ 0.9·U·d/F ≈ 0.8·U
ΔD ≈ 0.8·U·E/D ≈ 0.7·U
In the formula, Δd is the expansion of the inner ring (μm); ΔD is the expansion of the outer ring (μm); d is the inner diameter of the inner ring (mm); U (μm) is the theoretical interference with tight fittings (theoretical Interference Quantity refers to the difference between the two dimensional deviations obtained by subtracting 1/3 of the tolerance zone from the maximum solid deviation of each mating surface during interference fit. It takes into account the value of the flattening of the contact surfaces during assembly). F is the inner ring raceway diameter (mm); E is the outer ring raceway diameter(mm); D is the outer diameter of the outer ring (mm); the decrease in radial clearance due to temperature ΔST: Due to the large temperature difference between the inner and outer rings, the radial clearance change will be quite large.
ΔST = α·dM·1000·(υ'IR - υ'AR)
α(1/K) is the thermal expansion coefficient of steel:
α = 0.000011 · (1/K);
dM is the average diameter of the bearing (d+D)/2 (mm);
υ'IR (°C, K) is the inner ring temperature;
υ'AR (°C, K) is the outer ring temperature (often there is a temperature difference between the inner and outer rings: 5 K to 10 K).
Axial clearance: Internal axial clearance ΔSa The position at which a bearing ring moves from one limit position to another limit position in the axial direction of the bearing under no load condition, as shown in Figure 7.
Schematic diagram of bearing axial clearance
For different types of bearings, the internal radial clearance ΔSr and the internal axial clearance ΔSa are related to each other.
6 Conclusion
The application of paired tapered roller bearings, especially the control and adjustment of their clearance, needs to consider many factors, such as temperature rise, coordination, speed, etc. Different bearing manufacturers have their own calculation and control methods.
7 More about VAFEM Single Row Tapered Roller Bearing
As a precious high quality Single Row Tapered Roller Bearing manufacturer and supplier in China, VAFEM can guarantee the quality and precision of the products through complete testing technology and advanced equipment.
VAFEM Single Row Tapered Roller Bearing feature a cup and cone assembly. The cup is comprised of the outer ring and the cone assembly consists of inner ring, rollers, and cage. This bearing construction accommodates combined loads and provides low friction during operation. By adjusting one single row tapered roller bearing against a second tapered roller bearing and applying a preload, a rigid bearing application can be achieved.
VAFEM high quality Single Row Tapered Roller Bearing with reasonable price for customers all over the world and wish to enjoy the process of creating the shared value. Please come to buy Single Row Tapered Roller Bearing at the best price and quality from VAFEM. Please contact us for any questions!
VAFEM Single Row Tapered Roller Bearing TS Series
VAFEM single row tapered roller bearings are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads. The projection lines of the raceways meet at a common point on the bearing axis to provide a true rolling action and therefore low frictional moments during operation. The axial load carrying capacity of tapered roller bearings increases with increasing contact angle α. The size of the contact angle, which is usually between 10° and 30°, is related to the calculation factor e (from the product table): the larger the value of e, the larger the contact angle.
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2022-08-11