A cooling structure of a bearing bush and its manufacturing process

Abstract

The present invention discloses a cooling structure of a bearing and a manufacturing process thereof, comprising a bearing body, a coating, and an inserting component, wherein the coating covers the inner wall of the bearing body, the inserting component comprises an inserting rod and an inserting component body, the inserting component body is inserted into the coating along the radial direction of the coating, the inserting component body is located on one side of the inner wall of the coating, the bearing body is provided with a through hole 1, the inserting rod passes through the coating and is inserted into the through hole 1 with an interference fit, the inserting component is provided with a through hole 2, the two ends of the through hole 2 are respectively connected with the through hole 1 and the cavity on the radial inner side of the coating, a one-way valve is installed in the through hole 1, the one-way valve is located on the side of the inserting rod away from the coating, the allowed flow direction of the one-way valve is radially outward along the bearing body, a plurality of through holes 1 are evenly distributed along the circumference of the bearing body, and at least one of the through holes 1 is used as an oil inlet. The present invention provides a cooling structure of a bearing and a manufacturing process thereof, wherein cooling oil is not easily retained in the bearing, which is beneficial to reducing the working temperature of the bearing.

Description

Technical Field

[0001] The invention relates to the technical field of bearing bushes, and in particular to a cooling structure of a bearing bush and a manufacturing process thereof. Background Art

[0002] The outer wall of the main shaft running in the heavy machine is usually matched with the bearing. Due to its poor operating conditions and high load, the inner wall of the bearing is prone to high temperature, which affects the service life of the main shaft and the bearing. The conventional means is to cool down by passing cooling oil between the main shaft and the bearing. Usually, a hole is opened on one side of the outer wall of the bearing, and the hole is directly connected to the inner wall of the bearing. After the cooling oil is passed into the hole, the cooling oil flows in the gap channel between the main shaft and the bearing and flows out from the end face of the bearing. The unloading direction is along the axial direction of the bearing. When the main shaft rotates at high speed, it drives the cooling oil to rotate in the same direction. The rotation direction of the cooling oil forms a 90-degree angle with the unloading direction, resulting in part of the cooling oil being unable to unload in time and staying between the bearing and the main shaft for a long time, affecting the cooling effect. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a cooling structure of a bearing and a manufacturing process thereof, in which cooling oil is not easily retained in the bearing, which is beneficial to reducing the working temperature of the bearing.

[0004] The invention discloses a cooling structure of a bearing shell, comprising a bearing shell body, a coating, and an insert component, wherein the coating covers the inner wall of the bearing shell body, the insert component comprises an insert rod and an insert component body, the insert component body is inserted into the coating along the radial direction of the coating, the insert component body is located at one side of the inner wall of the coating, the bearing shell body is provided with a through hole one, the insert rod passes through the coating and is inserted into the through hole one with an interference fit, the insert component is provided with a through hole two, both ends of the through hole two are respectively connected with the through hole one and a cavity on the radial inner side of the coating, a one-way valve is installed in the through hole one, the one-way valve is located on the side of the insert rod away from the coating, the allowed flow direction of the one-way valve is radially outward along the bearing shell body, a plurality of through holes one are evenly distributed along the circumference of the bearing shell body, and at least one through hole one is used as an oil inlet, so that external cooling oil can be injected into the cavity on the radial inner side of the coating through the through hole one, and the one-way valve is not installed in the through hole one serving as the oil inlet.

[0005] Furthermore, the main body of the insert component does not expose the radial inner side of the inner wall of the coating.

[0006] Furthermore, the insert component body is provided with a groove, which is located on one side of the insert component body close to the center of the bearing shell body, one side of the groove is connected to the second through hole, and the other side is connected to the cavity on the radial inner side of the coating.

[0007] Furthermore, a gap is formed between the main body of the insert component and the inner wall of the main body of the bearing shell, and the coating fills the gap.

[0008] Furthermore, it also includes a gap portion, which is located radially inward of the coating and is connected to the second through hole.

[0009] Furthermore, the bearing body includes a bearing block 1 and a bearing block 2, which are spliced ​​and installed, and the coating includes a coating 1 and a coating 2, wherein the coating 1 covers the inner wall of the bearing block 1 and the coating 2 covers the inner wall of the bearing block 2.

[0010] The present invention also discloses a manufacturing process of a bearing cooling structure, which is used for processing the bearing cooling structure, and comprises the following steps:

[0011] ①Insert the plug-in component into the bearing body for installation, insert the plug-in rod into through hole 1 with interference fit, and form a filling gap between the plug-in component body and the inner wall of the bearing body;

[0012] ② A stopper is fixedly installed on one end of the insert component body away from the inner wall of the bearing shell body, so that the stopper forms a shield on the side of the insert component body close to the center of the bearing shell body;

[0013] ③Spray coating on the inner wall of the bearing shell;

[0014] ④ Remove the block and grind the insert component body close to the center of the bearing body;

[0015] ⑤Install a one-way valve in through hole 1.

[0016] Furthermore, after the insert component body is ground on one side close to the center of the bearing shell body, the insert component body does not expose the radial inner side of the inner wall of the coating.

[0017] Beneficial effects of the present invention:

[0018] Cooling oil is introduced into through hole 1 serving as the oil inlet, and the cooling oil flows into the gap portion and then flows out from the end faces on both sides of the bearing body along the outer wall of the main shaft. Driven by the high-speed rotation of the main shaft, the cooling oil rotates and cools the outer walls of the main shaft at various locations. Since the cooling oil near the center of the bearing body is not easy to discharge, long-term retention may easily cause high temperature of the inner wall of the bearing body. Therefore, an oil discharge channel formed by a groove, through hole 2 and through hole 1 is provided to throw out this part of the cooling oil through the high-speed rotation of the main shaft. At the same time, a one-way valve is provided in through hole 1 to ensure a certain flow pressure in the gap portion to prevent too little cooling oil. When the pressure reaches the flow pressure of the one-way valve, the one-way valve can open and leak the cooling oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of an embodiment;

[0020] Figure 2 for Figure 1 The enlarged view of point B in the middle;

[0021] Figure 3 for Figure 1 Sectional view along the NN axis;

[0022] Figure 4 for Figure 3 The enlarged view of point D in the middle;

[0023] Figure 5 A cross-sectional view of a processing state of the embodiment;

[0024] Figure 6 for Figure 5 The enlarged view of point A in the middle;

[0025] Figure 7 for Figure 5 Sectional view along the MM direction;

[0026] Figure 8 for Figure 7 Enlarged view of point C in the middle.

[0027] Figure numerals: bearing body 1, bearing block 1 11, bearing block 2 12, coating 13, coating 1 131, coating 2 132, through hole 1 14, plug-in component 2, plug rod 21, plug-in component body 22, groove 221, through hole 2 23, block 3, countersunk hole 31, screw 4, main shaft 5, gap portion 6, one-way valve 7. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in this embodiment to clearly and completely describe the technical solution in this embodiment. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, a cooling structure of a bearing bush includes a bearing bush body 1, the bearing bush body 1 is a ring structure, the inner wall of the bearing bush body 1 is covered with a coating 13, the coating 13 is sprayed on the inner wall of the bearing bush body 1 so that the two are combined into one, the coating 13 is distributed along the inner wall of the bearing bush body 1 to form a ring shape, and the coating 13 is an alloy layer for improving strength. A main shaft 5 is installed inside the coating 13, and the main shaft 5 passes through the coating 13. Figure 2 When the main shaft 5 rotates, a gap 6 is formed between the main shaft 5 and the coating 13, and cooling oil is introduced into the gap 6 to reduce the temperature.

[0030] like Figure 1 As shown, the bearing body 1 is installed with the insert component 2. Specifically, in combination with Figure 2The plug-in component 2 includes an insert rod 21 and an plug-in component body 22. The plug-in component body 22 is radially inserted into the coating 13 along the coating 13. The plug-in component body 22 is located on one side of the inner wall of the coating 13. The plug-in component body 22 does not expose the radial inner side of the inner wall of the coating 13 to prevent the plug-in component body 22 from interfering with the main shaft 5.

[0031] like Figure 1 , 3 As shown, the bearing shell body 1 is provided with a through hole 14, the through hole 14 radially penetrates the bearing shell body 1, and a plurality of through holes 14 are evenly distributed along the circumference of the bearing shell body 1. Figure 2 , the insertion rod 21 passes through the coating 13 and is inserted into the through hole 14 with an interference fit. Figure 3 A gap is formed between the insert component body 22 and the inner wall of the bearing shell body 1 , and the coating 13 fills the gap, so that the coating 13 is continuous in the circumferential direction, thereby improving the strength of the coating 13 .

[0032] Combination Figure 3 , Figure 4 The insert component 2 is provided with a second through hole 23, which axially penetrates the insert component 2, and the axial ends of the second through hole 23 are respectively connected with the through hole 14 and the cavity on the radial inner side of the coating 13 (that is, connected with the gap portion 6).

[0033] like Figure 2 As shown, the insert component body 22 is provided with a groove 221, one side of the groove 221 is connected to the through hole 23, and the other side is connected to the cavity on the radial inner side of the coating 13, that is, connected to the gap portion 6). Figure 4 The groove 221 penetrates the insert component body 22 axially along the bearing shell body 1 . Figure 2 In the embodiment, the groove 221 is recessed toward the side away from the main shaft 5 to facilitate the cooling oil to enter the groove 221 and flow out along the second through hole 23 .

[0034] like Figure 1 As shown, a one-way valve 7 is installed in the through hole 14. The one-way valve 7 is located on the side of the insertion rod 21 away from the coating 13. The allowed flow direction of the one-way valve 7 is radially outward along the bearing body 1. The cooling oil flowing out of the through hole 23 flows out from the one-way valve 7 to the outer wall of the bearing body 1 after reaching the flow pressure of the one-way valve 7.

[0035] Among the multiple through holes 14, at least one through hole 14 serves as an oil inlet, so that external cooling oil can be pumped into the cavity on the radial inner side of the coating 13 through the through hole 14, and the one-way valve 7 is not installed in the through hole 14 serving as the oil inlet.

[0036] like Figure 1As shown, due to the large size of the bearing body 1, the bearing body 1 is assembled by splicing two semicircular rings of the bearing block 11 and the bearing block 12, and the corresponding coating 13 is also spliced ​​by coating 1 131 at the inner wall of the bearing block 11 and coating 2 132 at the inner wall of the bearing block 2 12.

[0037] like Figure 1 , Figure 2 As shown, when the bearing cooling structure is in use, cooling oil is introduced into the through hole 14 as the oil inlet, and the cooling oil flows into the gap portion 6. Figure 3 The cooling oil flows out from the end faces of both sides of the bearing body 1 along the outer wall of the main shaft 5. When the main shaft 5 rotates at a high speed, the cooling oil rotates and cools the outer walls of the main shaft 5. Since the cooling oil near the center of the bearing body 1 is not easy to be discharged, it is easy to cause high temperature of the inner wall of the bearing body 1 if it stays there for a long time. Therefore, the oil discharge channel formed by the groove 221, the through hole 23 and the through hole 14 is provided to throw out this part of the cooling oil through the high-speed rotation of the main shaft 5. At the same time, a one-way valve 7 is provided in the through hole 14 to ensure a certain flow pressure in the gap 6 to prevent too little cooling oil. When the pressure reaches the flow pressure of the one-way valve 7, the one-way valve 7 can be opened to discharge the cooling oil.

[0038] The manufacturing process of the above bearing cooling structure is as follows:

[0039] ① Such as Figure 5 , Figure 6 As shown, the insert component 2 is inserted into the inner wall of the bearing body 1 for installation, and the insert rod 21 is inserted into the through hole 14 through interference fit. Figure 7 , Figure 8 A filling gap is formed between the insert component body 22 and the inner wall of the bearing shell body 1, waiting for the coating 13 to be filled.

[0040] ② If Figure 6 As shown, a stopper 3 is installed at one end of the insert component body 22 away from the inner wall of the bearing shell body 1, and the cross-sectional size of the stopper 3 matches the cross-sectional size of the insert component body 22. Figure 8 The stopper 3 forms a shield on the side of the insert component body 22 close to the center of the bearing shell body 1.

[0041] like Figure 6 As shown, a countersunk hole 31 is provided on one side of the stopper 3 close to the plug-in component body 22, and a screw 4 is inserted into the second through hole 23. The screw 4 is a hexagon socket screw. The screw 4 is screwed into the countersunk hole 31, and the head of the screw 4 abuts against the end of the plug-in component body 22 of the plug-in component to fix the stopper 3 to the plug-in component 2.

[0042] ③ Spray coating 13 on the inner wall of the bearing body 1 to form an alloy protective layer. After spraying, the coating 13 is bonded to the outer wall of the bearing body 1 and part of the plug-in component body 22. At this time, the plug-in component body 22 is exposed radially inside the inner wall of the coating 13.

[0043] ④ Such as Figure 6 As shown, the block 3 is removed, and the insert component body 22 is ground near the bearing shell body 1. Since the insert component body 22 is made of a material with a lower hardness than the coating 13, the machining difficulty is greatly reduced, the tool wear is reduced, and the tool life is greatly increased. Figure 2 A groove 221 is processed on the side of the plug-in component body 22 close to the bearing body 1. After the groove 221 is formed, the plug-in component body 22 does not expose the radial inner side of the inner wall of the coating 13, so that the plug-in component body 22 will not generate friction with the main shaft 5. Therefore, the material of the plug-in component body 22 does not affect the use of the main shaft 5, and prevents the rotation of the main shaft 5 from causing wear to the plug-in component body 22 with lower hardness and affecting its service life.

[0044] ⑤ Install a one-way valve 7 in the through hole 14. One of the through holes 14 is used as an oil inlet and does not need to be installed with a one-way valve 7.

[0045] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A cooling structure for a bearing bush, characterized in that: The invention comprises a bearing shell body (1), a coating (13), and an insert component (2), wherein the coating (13) covers the inner wall of the bearing shell body (1), the insert component (2) comprises an insert rod (21) and an insert component body (22), the insert component body (22) is radially inserted into the coating (13), the insert component body (22) is located on one side of the inner wall of the coating (13), the bearing shell body (1) is provided with a through hole (14), the insert rod (21) passes through the coating (13) and is inserted into the through hole (14) by interference fit, and the insert component (2) is provided with a through hole (23), the two ends of the through hole (23) are respectively connected to the through hole (14) and the two ends of the through hole (23) are respectively connected to the through hole (14). The through hole (14) and the cavity on the radial inner side of the coating (13) are connected, and a one-way valve (7) is installed in the through hole (14). The one-way valve (7) is located on the side of the insertion rod (21) away from the coating (13). The allowed flow direction of the one-way valve (7) is radially outward along the bearing body (1). There are multiple through holes (14) evenly distributed along the circumference of the bearing body (1), and at least one of the through holes (14) serves as an oil inlet, so that external cooling oil can be injected into the cavity on the radial inner side of the coating (13) through the through hole (14). The one-way valve (7) is not installed in the through hole (14) serving as the oil inlet.

2. A cooling structure for a bearing bush according to claim 1, characterized in that: The insert component body (22) does not expose the radial inner side of the inner wall of the coating (13).

3. A cooling structure for a bearing bush according to claim 2, characterized in that: The insert component body (22) is provided with a groove (221), and the groove (221) is located on one side of the insert component body (22) close to the center of the bearing shell body (1), and one side of the groove (221) is connected to the second through hole (23), and the other side is connected to the cavity on the radial inner side of the coating (13).

4. A cooling structure for a bearing bush according to claim 1, characterized in that: A gap is formed between the insert component body (22) and the inner wall of the bearing shell body (1), and the coating (13) fills the gap.

5. The cooling structure of a bearing bush according to claim 1, characterized in that: It also includes a gap portion (6), the gap portion (6) is located radially inward of the coating (13), and the gap portion (6) is connected to the second through hole (23).

6. A cooling structure for a bearing bush according to claim 1, characterized in that: The bearing shell body (1) comprises a first shell block (11) and a second shell block (12), wherein the first shell block (11) and the second shell block (12) are spliced ​​and installed, and the coating (13) comprises a first coating (131) and a second coating (132), wherein the first coating (131) covers the inner wall of the first shell block (11), and the second coating (132) covers the inner wall of the second shell block (12).

7. A manufacturing process for a bearing cooling structure, used for processing a bearing cooling structure according to any one of claims 1 to 6, characterized in that: The steps include: ① inserting the insert component (2) into the bearing shell body (1) for installation, the insert rod (21) is inserted into the through hole 1 (14) with interference fit, and a filling gap is formed between the insert component body (22) and the inner wall of the bearing shell body (1); ② A stopper (3) is fixedly installed at one end of the insert component body (22) away from the inner wall of the bearing shell body (1), so that the stopper (3) forms a shield on the side of the insert component body (22) close to the center of the bearing shell body (1); ③ spraying the coating (13) on the inner wall of the bearing shell body (1); ④ removing the stopper (3) and performing grinding processing on the side of the insert component body (22) close to the center of the bearing shell body (1); ⑤ Install the one-way valve (7) in the through hole 1 (14).

8. The manufacturing process of a bearing cooling structure according to claim 7, characterized in that: After the insert component body (22) is ground on one side close to the center of the bearing shell body (1), the insert component body (22) does not expose the radial inner side of the inner wall of the coating (13).

Images