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Engine bearing repair key and precautions

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First, the key to repair (1), the thin-walled bearing bush does not agree to repair the scratch; only the wearable alloy coating of the modern engine crankshaft main bearing and the connecting rod bearing bush can be selected according to the corresponding scale.诙 诙 诙 艿 艿 悴 悴 悴 悴 悴 硇 硇 硇 硇 硇 硇 嘤 嘤 嘤 嘤 嘤 嘤 嘤 嘤 嘤 嘤 叽缪∨洌绻 叽缪∨洌绻 叽缪∨洌绻 叽缪∨洌绻 叽缪∨洌绻 叽缪∨洌绻 鲜 鲜 鲜 鲜 鲜 鲜 鲜 鲜 鲜 鲜 关于 关于 关于 关于(The steel back is composed of a copper-lead alloy layer); the thickness of the surface alloy plating on the copper-lead alloy is usually 0. 02~0. 03mm; if the scraping will damage its cooperative function; Or directly install the product tile; mainly based on the cooperation scale; mainly check the touch marks and tightness; the print marks are slightly less than 75% is also agreed. After the bearing pads wear; can not be padded on the tile back. Bearings do not allow loose after installation .
(2) The thinned bushing working surface boundary is selected from the thinning of the bearing surface at the boundary of the working surface; there is a certain amount of interference due to the installation of the bearing bush; it can cause slight deformation of the interface; damage the smoothness of the bearing bush and working conditions. This is to cut the boundary of the bearing surface by 15~35μm; it is equivalent to opening a longitudinal oil groove with a small cross section at the inner circumferential boundary of the bearing; it is good for smoothing and punching out impurities. If the repairing plant chooses the individual casting bush; The above layout must be processed to ensure the quality of the engine repair.
(3) There is a positioning lip on the opposite side of the bearing bush to avoid the transition, movement and oscillation when the bearing bushing is in operation; the key to the firm positioning is the appropriate interference; instead of relying on the positioning lip; the effect of positioning the lip is the initial installation. Positioning.
(4), the crankshaft tape tightness adjustment is appropriate if the tape is too tight; not only the formation of transmission resistance; it will also cause the pump shaft, fan shaft and communication generator shaft deformation; even accelerate bearing damage.
(5), the thickness of the alloy of the crankshaft and the connecting rod bushing tends to be thinner if the alloy layer of the bearing bush is compared. The 蹦诓 蹦诓 Ψ Ψ Ψ Ψ Ψ Ψ 焙 焙 焙 焙 焙 焙 焙 焙 焙 焙 焙 焙 焙 焙 焙 焙悖槐砻娴Na@妥纯鲆书痛蟠蟾. Through experiments; found that the thin alloy layer is the most used; the bonding condition is also good. The alloy layer thickness of the crankshaft and connecting rod uranium tile; 0. 25 ~ 0. 4mm; copper lead alloy is 0. 4 ~ 0. 8mm; the thickness of the above alloy layer does not include the amount of scraping.
(6) There must be a certain gap between the bearing bush or the bearing sleeve and the journal. The gap of the sliding bearing has two kinds of radial clearance and axial clearance. The radial clearance is divided into a top clearance and a side clearance; the former value is about Two times, the axial gap is also called the inter-axis turbulence; it is divided into thrust gap and swell.
Second, repair precautions (1), the main bearing housing hole concentricity diesel engine cylinder body in the application process; both longitudinal deformation; and lateral deformation; the greater the degree of deformation; the hole concentricity error is also greater. If the error fits When the original factory rule is less than 0. 04mm; the journal can be ground according to the rules and the bearing with the same repairing scale can be directly used. If the error is according to the maximum value of the near norm rule (the full length is not greater than 0.15mm); The concentricity error of the hole is not more than 0. 10mm; the wear-reducing alloy bearing can be selected; that is, the bearing with anti-seizure, embedding, compliance and corrosion resistance; such as high-tin aluminum-based alloy bearing, etc., if concentric When the error greatly exceeds the specification value; the seat hole can be boring (the most suitable bearing boring machine with high machining precision); then the steel back thickened bearing is selected. To reduce the influence of installation error and phase orientation error; Before boring or scraping the bearing, it is necessary to check the horizontal line; that is, put one side of the bearing on the inverted cylinder block bearing seat; then lift the crankshaft; convert the crankshaft several times without the bearing cover; then lift Lower crankshaft inspection The touch imprint; and modulated or repair scratch pad set; substantially the same footprint of the touch; touch to ensure that the bearing surface of the topsheet at the same level.
(2), the rod bearing housing hole before the optional bearing; should check the roundness of the seat hole; avoid the over-poor. The method is: wipe the seat hole; plus the bearing cover; tighten the nut according to the regular torque; then measure Roundness of the seat hole. If the roundness error is less than 0. 03mm; if no spacer is used, if it is 0. 03~0. 07mm; then 0. 05mm thick "no pressure bearing pad" can be added at each end. Beyond 0. 07mm; should be welded at both ends of the bearing cap; or use the brush plating process to make the end face thicker.
(3) The free elastic force of the bearing is to make the bearing easy to install and fit tightly with the seat hole; to avoid the bearing cover working outward under the effect of pressure after the bearing cover is tightened; it is necessary to ensure the bearing self-loading after repairing The potential fit meets the requirements. Usually the minimum thickness of the thin-walled bearing is 0. 25~0. 50mm; the maximum is 1.20~1.50mm. If the stretch is over. 岬 Jialu ぷ魇敝岢 oblique scale cyst makeup 砻娣(5)喽 喽 灰 fatigue spring 踔 斐 斐 袄 袄 袄 袄 鹿 鹿 鹿 鹿 傻 傻 螅 螅 螅 螅 螅 辜跄ズ 辜跄ズ 辜跄ズ 辜跄ズ 辜跄ズ 辜跄ズ 辜跄ズ 辜跄ズ 粲 粲 粲 粲 粲 粲 Ψ Ψ Ψ Ψ Ψ Ψ Ψ .
(4), the opposite side of the bearing, the printed mark can identify the cylindricity of the seat hole, the height of the end face of the bearing and the curvature of the substitute tile. When checking, a thin red oil can be applied inside and outside the seat hole; Bearing cap; after tightening the nut with regular torque; then remove the bearing to check the reverse printed surface; the normal fit area should be above 85%. For example, the end of the two bearing prints are shallow; there is no impression in the middle; When the torque is applied, there is no gap at both ends; the height of the bearing end face is too low, such as the imprint of one end of the two bearings; the other end has no imprint; the cylindricity of the seat is out of tolerance, such as the depth of the two marks; the middle is not printed or printed;捎 捎 捎 仆 仆 仆 . . . . . .
(5), the repair of the bearing is not allowed to pick the scraping of the bearing working surface; the picking scraping will scrape off the third alloy layer to make it wear more, the star point of the working surface is full of attack stress concentration will cause the alloy layer to be broken or broken; even The bearing alloy layer is partially melted. Therefore, the squeegee should be used instead of the scraping process.
Modern diesel sliding bearings are very sensitive to faults; therefore, when the normal working conditions of the bearing are damaged; it is usually not easy to detect. Once the "burning tile" and "holding shaft" events occur, the temperature has reached 800~900 °C. At high temperatures; the crankshaft will be partially discolored and annealed; even micro-cracks; usually can not be used continuously. Because the high temperature will also make the bearing seat discoloration; base to attack deformation; correction is also very difficult. Therefore; in addition to the preferred copper-lead alloy bearings; During the repair, the following problems should be paid attention to: first grinding the worn journal; then matching the bearing of the corresponding scale; cutting the bearing without scraping or boring to cooperate with the worn journal. In the absence of the crankshaft grinding machine and the crankshaft When the neck wear is normal; use the transitional scraping method to repair the bearing; that is, use a bearing that is larger than the journal to increase the first level; if it is a gap, 墒褂谩 墒褂谩 叩妗 叩妗 叩妗 叩妗 叩妗 笫 榭龆 榭龆 榭龆 榭龆 榭龆 榭龆 榭龆 榭龆 狡岢 狡岢 狡岢Pouring the tomb, smashing the sputum, smashing the shackles, smashing the shackles, and smashing the shackles. The squeegee needs to be finished 2 to 3 times; until the void fit rules stop.
(6) Tightening torque of bearing cap fixing screw test It is necessary to tighten the bearing cap fixing bolt with regular torque when installing. The tightening order of the main bearing cap of each cylinder is usually the first center and the rear two ends; the tightening order of the 6-cylinder in-line diesel engine 4-3 -5-2-6-1-7.

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