Ways to improve the reliability of 7215 bearings (2)

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Ways to improve the reliability of 7215 bearings (2)

Source: China Bearing Network Time: 2018-04-30
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The cause of bearing damage is disordered; the bearing often works at high temperature; the strength of the bearing is lowered; the frequent overloading of the bulldozer causes the bearing to be subjected to a large axial impact frequently; the ball and the raceway are plastically deformed and damaged, and the lubrication Unclean oil will form the early wear of the bearing. These reasons are due to the operator's excessive use and protection of the bulldozer; the bearing is operated under very harsh conditions for a long time; various adverse effects act together on a bearing; In the early stage of the formation of a single bearing damage. In order to reduce the failure rate of the torque converter to zero; the bearing in the drawing, production, selection and installation process in many aspects of the specific requirements.
3. The special requirements for the depiction, fabrication and selection of bearings are to improve the reliability of the bearings under relatively harsh operating conditions; special requirements are placed on the depiction, fabrication and selection of bearings:
3.1 The selection of the touch angle 7215 bearing is an angular touch ball bearing; the angular touch ball bearing can accept the radial load and the axial load together; its axial load can be determined by the touch angle; the larger the touch angle can accept the axial load The larger the angular touch ball bearing has three standard touch angles; 15°, 25° and 40° respectively; the original TY320 torque converter uses a 25° touch angle bearing; the 40° touch angle bearing is suitable for acceptance. Large axial load; this pair of bearings must accept a large axial impact load during heavy load operation of the bulldozer; therefore, we use a 7215B/DB bearing with a touch angle of 40°. (The rear code B indicates that the touch angle is 40°)
3.2 Optimization of the inner ferrule The inner ferrule of the 7215B/DB bearing has two standards; the inner diameter of the inner ferrule raceway is the same; since the angular touch ball bearing can only accept one direction Axial load; such that the shoulder of one side of the inner ferrule raceway is not subjected to axial load; the shoulder of the other side can not accept a large axial impact load. Optimized depiction; in the case of the same component; The diameter of the two inner shoulders of a standard inner ring raceway is different; the diameter of the shoulder shoulder is not acceptable on the side of the axial load; the testicular sputum is noisy. The cockroaches are noisy and noisy, so we use the latter standard to optimize the inner ferrule.
3.3. Requirements for cage data and styles The mechanical stresses on the cage are derived from friction, strain and inertia; they are also corroded by certain lubricants, their aging products, organic impurities and other chemicals; Therefore, the selection of the cage data has a great influence on the reliability of the bearing operation. Because the bearing operates at a higher temperature; the phenolic laminate tube solid cage or the nylon cage cannot be selected; and it is frequently subjected to a large axial impact load; Therefore, we use the 7215BM/DB bearing of the brass solid cage. (The rear code M indicates the brass solid cage). Because of the different diameter layout of the bearing shoulders and the outer ring of the outer ring; the space reserved for the cage It is not too big. If the inner ring-guided cage is used, the thickness of the cage is more than that of the 3rd.
3. 4 pairs of pre-tightening deformation δ is determined that the angular contact ball bearing of the paired device is considered to have a large amount of pre-tightening deformation in bearing production.


The cause of bearing damage is disordered; the bearing often works at high temperature; the strength of the bearing is lowered; the frequent overloading of the bulldozer causes the bearing to be subjected to a large axial impact frequently; the ball and the raceway are plastically deformed and damaged, and the lubrication Unclean oil will form the early wear of the bearing. These reasons are due to the operator's excessive use and protection of the bulldozer; the bearing is operated under very harsh conditions for a long time; various adverse effects act together on a bearing; In the early stage of the formation of a single bearing damage. In order to reduce the failure rate of the torque converter to zero; the bearing in the drawing, production, selection and installation process in many aspects of the specific requirements.
3. The special requirements for the depiction, fabrication and selection of bearings are to improve the reliability of the bearings under relatively harsh operating conditions; special requirements are placed on the depiction, fabrication and selection of bearings:
3.1 The selection of the touch angle 7215 bearing is an angular touch ball bearing; the angular touch ball bearing can accept the radial load and the axial load together; its axial load can be determined by the touch angle; the larger the touch angle can accept the axial load The larger the angular touch ball bearing has three standard touch angles; 15°, 25° and 40° respectively; the original TY320 torque converter uses a 25° touch angle bearing; the 40° touch angle bearing is suitable for acceptance. Large axial load; this pair of bearings must accept a large axial impact load during heavy load operation of the bulldozer; therefore, we use a 7215B/DB bearing with a touch angle of 40°. (The rear code B indicates that the touch angle is 40°)
3.2 Optimization of the inner ferrule The inner ferrule of the 7215B/DB bearing has two standards; the inner diameter of the inner ferrule raceway is the same; since the angular touch ball bearing can only accept one direction Axial load; such that the shoulder of one side of the inner ferrule raceway is not subjected to axial load; the shoulder of the other side can not accept a large axial impact load. Optimized depiction; in the case of the same component; The diameter of the two inner shoulders of a standard inner ring raceway is different; the diameter of the shoulder shoulder is not acceptable on the side of the axial load; the testicular sputum is noisy. The cockroaches are noisy and noisy, so we use the latter standard to optimize the inner ferrule.
3.3. Requirements for cage data and styles The mechanical stresses on the cage are derived from friction, strain and inertia; they are also corroded by certain lubricants, their aging products, organic impurities and other chemicals; Therefore, the selection of the cage data has a great influence on the reliability of the bearing operation. Because the bearing operates at a higher temperature; the phenolic laminate tube solid cage or the nylon cage cannot be selected; and it is frequently subjected to a large axial impact load; Therefore, we use the 7215BM/DB bearing of the brass solid cage. (The rear code M indicates the brass solid cage). Because of the different diameter layout of the bearing shoulders and the outer ring of the outer ring; the space reserved for the cage It is not too big. If the inner ring-guided cage is used, the thickness of the cage is more than that of the 3rd.
3.4 pairs of pre-tightening deformation δ is determined that the angular contact ball bearing of the paired device is considered to have a large amount of pre-tightening deformation in bearing production. 谙 涠 涠 牧 牧 牧 谔 Φ Φ Φ嗣嫔 嗣嫔 トヒ トヒ トヒ ǖ ǖ ǖ ǖ そ舯湫瘟 そ舯湫瘟 そ舯湫瘟 そ舯湫瘟 舛 舛 舛 舛 舛 沧 沧 考 考 考 考 考 考 考 考 考 考 考 考 考 考 考 考 爸 爸 爸 爸 爸Sting. As shown in Figure 2.


The cause of bearing damage is disordered; the bearing often works at high temperature; the strength of the bearing is lowered; the frequent overloading of the bulldozer causes the bearing to be subjected to a large axial impact frequently; the ball and the raceway are plastically deformed and damaged, and the lubrication Unclean oil will form the early wear of the bearing. These reasons are due to the operator's excessive use and protection of the bulldozer; the bearing is operated under very harsh conditions for a long time; various adverse effects act together on a bearing; In the early stage of the formation of a single bearing damage. In order to reduce the failure rate of the torque converter to zero; the bearing in the drawing, production, selection and installation process in many aspects of the specific requirements.
3. The special requirements for the depiction, fabrication and selection of bearings are to improve the reliability of the bearings under relatively harsh operating conditions; special requirements are placed on the depiction, fabrication and selection of bearings:
3.1 The selection of the touch angle 7215 bearing is an angular touch ball bearing; the angular touch ball bearing can accept the radial load and the axial load together; its axial load can be determined by the touch angle; the larger the touch angle can accept the axial load The larger the angular touch ball bearing has three standard touch angles; 15°, 25° and 40° respectively; the original TY320 torque converter uses a 25° touch angle bearing; the 40° touch angle bearing is suitable for acceptance. Large axial load; this pair of bearings must accept a large axial impact load during heavy load operation of the bulldozer; therefore, we use a 7215B/DB bearing with a touch angle of 40°. (The rear code B indicates that the touch angle is 40°)
3.2 Optimization of the inner ferrule The inner ferrule of the 7215B/DB bearing has two standards; the inner diameter of the inner ferrule raceway is the same; since the angular touch ball bearing can only accept one direction Axial load; such that the shoulder of one side of the inner ferrule raceway is not subjected to axial load; the shoulder of the other side can not accept a large axial impact load. Optimized depiction; in the case of the same component; The diameter of the two inner shoulders of a standard inner ring raceway is different; the diameter of the shoulder shoulder is not acceptable on the side of the axial load; the testicular sputum is noisy. The cockroaches are noisy and noisy, so we use the latter standard to optimize the inner ferrule.
3.3. Requirements for cage data and styles The mechanical stresses on the cage are derived from friction, strain and inertia; they are also corroded by certain lubricants, their aging products, organic impurities and other chemicals; Therefore, the selection of the cage data has a great influence on the reliability of the bearing operation. Because the bearing operates at a higher temperature; the phenolic laminate tube solid cage or the nylon cage cannot be selected; and it is frequently subjected to a large axial impact load; Therefore, we use the 7215BM/DB bearing of the brass solid cage. (The rear code M indicates the brass solid cage). Because of the different diameter layout of the bearing shoulders and the outer ring of the outer ring; the space reserved for the cage It is not too big. If the inner ring-guided cage is used, the thickness of the cage is more than that of the 3rd.
3.4 pairs of pre-tightening deformation δ is determined that the angular contact ball bearing of the paired device is considered to have a large amount of pre-tightening deformation in bearing production. 谙 涠 涠 牧 牧 牧 谔 Φ Φ Φ嗣嫔 嗣嫔 トヒ トヒ トヒ ǖ ǖ ǖ ǖ そ舯湫瘟 そ舯湫瘟 そ舯湫瘟 そ舯湫瘟 舛 舛 舛 舛 舛 沧 沧 考 考 考 考 考 考 考 考 考 考 考 考 考 考 考 考 爸 爸 爸 爸 爸Sting. As shown in Figure 2.


The cause of bearing damage is disordered; the bearing often works at high temperature; the strength of the bearing is lowered; the frequent overloading of the bulldozer causes the bearing to be subjected to a large axial impact frequently; the ball and the raceway are plastically deformed and damaged, and the lubrication Unclean oil will form the early wear of the bearing. These reasons are due to the operator's excessive use and protection of the bulldozer; the bearing is operated under very harsh conditions for a long time; various adverse effects act together on a bearing; In the early stage of the formation of a single bearing damage. In order to reduce the failure rate of the torque converter to zero; the bearing in the drawing, production, selection and installation process in many aspects of the specific requirements.
3. The special requirements for the depiction, fabrication and selection of bearings are to improve the reliability of the bearings under relatively harsh operating conditions; special requirements are placed on the depiction, fabrication and selection of bearings:
3.1 The selection of the touch angle 7215 bearing is an angular touch ball bearing; the angular touch ball bearing can accept the radial load and the axial load together; its axial load can be determined by the touch angle; the larger the touch angle can accept the axial load The larger the angular touch ball bearing has three standard touch angles; 15°, 25° and 40° respectively; the original TY320 torque converter uses a 25° touch angle bearing; the 40° touch angle bearing is suitable for acceptance. Large axial load; this pair of bearings must accept a large axial impact load during heavy load operation of the bulldozer; therefore, we use a 7215B/DB bearing with a touch angle of 40°. (The rear code B indicates that the touch angle is 40°)
3.2 Optimization of the inner ferrule The inner ferrule of the 7215B/DB bearing has two standards; the inner diameter of the inner ferrule raceway is the same; since the angular touch ball bearing can only accept one direction Axial load; such that the shoulder of one side of the inner ferrule raceway is not subjected to axial load; the shoulder of the other side can not accept a large axial impact load. Optimized depiction; in the case of the same component; The diameter of the two inner shoulders of a standard inner ring raceway is different; the diameter of the shoulder shoulder is not acceptable on the side of the axial load; the testicular sputum is noisy. The cockroaches are noisy and noisy, so we use the latter standard to optimize the inner ferrule.
3.3. Requirements for cage data and styles The mechanical stresses on the cage are derived from friction, strain and inertia; they are also corroded by certain lubricants, their aging products, organic impurities and other chemicals; Therefore, the selection of the cage data has a great influence on the reliability of the bearing operation. Because the bearing operates at a higher temperature; the phenolic laminate tube solid cage or the nylon cage cannot be selected; and it is frequently subjected to a large axial impact load; Therefore, we use the 7215BM/DB bearing of the brass solid cage. (The rear code M indicates the brass solid cage). Because of the different diameter layout of the bearing shoulders and the outer ring of the outer ring; the space reserved for the cage It is not too big. If the inner ring-guided cage is used, the thickness of the cage is more than that of the 3rd.
3.4 pairs of pre-tightening deformation δ is determined that the angular contact ball bearing of the paired device is considered to have a large amount of pre-tightening deformation in bearing production. 谙 涠 涠 牧 牧 牧 谔 Φ Φ Φ嗣嫔 嗣嫔 トヒ トヒ トヒ ǖ ǖ ǖ ǖ そ舯湫瘟 そ舯湫瘟 そ舯湫瘟 そ舯湫瘟 舛 舛 舛 舛 舛 沧 沧 考 考 考 考 考 考 考 考 考 考 考 考 考 考 考 考 爸 爸 爸 爸 爸Sting. As shown in Figure 2.

The cause of bearing damage is disordered; the bearing often works at high temperature; the strength of the bearing is lowered; the frequent overloading of the bulldozer causes the bearing to be subjected to a large axial impact frequently; the ball and the raceway are plastically deformed and damaged, and the lubrication Unclean oil will form the early wear of the bearing. These reasons are due to the operator's excessive use and protection of the bulldozer; the bearing is operated under very harsh conditions for a long time; various adverse effects act together on a bearing; In the early stage of the formation of a single bearing damage. In order to reduce the failure rate of the torque converter to zero; the bearing in the drawing, production, selection and installation process in many aspects of the specific requirements.
3. The special requirements for the depiction, fabrication and selection of bearings are to improve the reliability of the bearings under relatively harsh operating conditions; special requirements are placed on the depiction, fabrication and selection of bearings:
3.1 The choice of the touch angle 7215 bearing is the angular touch ball bearing; the angular touch ball bearing can accept the radial load and the axial load together; its axial load can be determined by the touch angle; the larger the touch angle can accept the axial load The larger the angular touch ball bearing has three standard touch angles; 15°, 25° and 40° respectively; the original TY320 torque converter uses a 25° touch angle bearing; the 40° touch angle bearing is suitable for acceptance. Large axial load; this pair of bearings must accept a large axial impact load during heavy load operation of the bulldozer; therefore, we use a 7215B/DB bearing with a touch angle of 40°. (The rear code B indicates that the touch angle is 40°)
3.2 Optimization of the inner ferrule The inner ferrule of the 7215B/DB bearing has two standards; the inner diameter of the inner ferrule raceway is the same; since the angular touch ball bearing can only accept one direction Axial load; such that the shoulder of one side of the inner ferrule raceway is not subjected to axial load; the shoulder of the other side can not accept a large axial impact load. Optimized depiction; in the case of the same component; The diameter of the two inner shoulders of a standard inner ring raceway is different; the diameter of the shoulder shoulder is not acceptable on the side of the axial load; the testicular sputum is noisy. The cockroaches are noisy and noisy, so we use the latter standard to optimize the inner ferrule.
3.3 Requirements for cage data and styles The mechanical stresses on the cage are derived from friction, strain and inertia; they are also corroded by certain lubricants, their aging products, organic impurities and other chemicals; Therefore, the selection of the cage data has a great influence on the reliability of the bearing operation. Because the bearing operates at a higher temperature; the phenolic laminate tube solid cage or the nylon cage cannot be selected; and it is frequently subjected to a large axial impact load; Therefore, we use the 7215BM/DB bearing of the brass solid cage. (The rear code M indicates the brass solid cage). Because of the different diameter layout of the bearing shoulders and the outer ring of the outer ring; the space reserved for the cage It is not too big. If the inner ring-guided cage is used, the thickness of the cage is more than that of the 3rd.
3.4 For the pre-tightening deformation δ, the angular contact ball bearing of the paired device is considered to have a large amount of pre-tightening deformation in bearing production, as shown in Fig. 2.
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