Bearing arrangement structure of oil pump motor
By adopting a method in which the front bearing is positioned with the motor main shaft and the rear bearing is positioned with a wave spring in the oil pump motor bearing arrangement structure, combined with a semicircular positioning groove and an O-ring, the problem of bearing outer ring creep is solved, the service life of the motor is increased, and maintenance costs are reduced.
Patent Information
- Application Number
- CN202422602818.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-10-28
AI Technical Summary
After long-term operation, the assembly relationship between the bearing outer ring and the motor end cover of the existing oil pump motor changes, resulting in bearing run-out, which shortens the motor life and increases maintenance costs.
The outer ring of the front bearing contacts the inner step of the front bearing chamber, the inner ring contacts the shoulder of the motor main shaft, and is positioned by a calculated dimension chain; the outer ring of the rear bearing contacts the wave spring, the inner ring contacts the shoulder of the motor main shaft, and is positioned by a calculated dimension chain, and the wave spring is compressed to provide elastic force; the outer ring of the front bearing is provided with a semicircular positioning groove to be fixed to the motor flange end cover, and the outer ring of the rear bearing is provided with a radial stop groove and an O-ring to increase friction.
Effectively prevent the creep of the bearing outer ring, reduce the load, avoid the displacement of the bearing chamber, extend the service life of the motor and reduce maintenance costs.
Smart Images
Figure CN223462849U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to oil pump motor technical field especially relates to an oil pump motor bearing arrangement structure. BACKGROUND
[0002] The oil pump motor is a common type of motor, and its application fields include nuclear power, wind power, automobile, smelting, hoisting and transmission transportation, etc. Therefore, the oil pump motor market is broad and various.
[0003] However, the existing oil pump motor in the market has the problem of high temperature rise of the whole motor under load condition after long-term operation, which can cause high temperature of the end cover and bearing parts, resulting in thermal expansion, and further causing the inner diameter size of the bearing chamber to be larger than the outer ring size of the bearing, so that the assembly relationship of the two changes from transition fit to clearance fit, and the outer ring of the bearing runs off, which can cause noise of the motor and even bearing failure. In addition, frequent replacement of the bearing can continuously increase the maintenance and after-sales costs.
[0004] The industry has made a lot of research on this problem, and the common method to solve this problem in the market is to use a material with low thermal expansion coefficient and high strength as the motor end cover, for example, to change the commonly used HT200 in the industry to HT250. However, due to the great similarity between the two materials, the improvement effect of this method is not ideal after long-term operation. The second method is to use a bearing with larger clearance and lubricating grease with lower viscosity. This method can effectively improve the service life of the bearing during high-speed operation, but it cannot completely solve the technical problem of bearing running off.
[0005] In other words, the existing technology mainly has the following defects:
[0006] (1) The medium and small oil pump motors existing in the market mainly include 80-160 motors, which basically use oil-free and maintenance-free bearings. Under normal circumstances, the bearing and lubricating grease of the oil pump motor can meet the use requirements of the whole life cycle of the motor. However, due to long-term operation, the outer ring of the bearing can creep, and the assembly fit of the bearing and the motor end cover can change, which can cause the bearing to run off the outer ring. When discovered by people, most bearings have already failed, and even serious consequences such as motor damage can occur.
[0007] (2) The common method to solve this problem in the market is to use a material with low thermal expansion coefficient and high strength as the motor end cover, for example, to change the commonly used HT200 in the industry to HT250. However, due to the great similarity between the two materials, the effect of this method is not ideal after long-term operation. Or use a bearing with larger clearance and lubricating grease with lower viscosity. This method can only improve the service life of the oil pump motor bearing during high-speed operation, but it cannot completely solve the problem of bearing running off. Utility Model Content
[0008] The purpose of the utility model is to provide an oil pump motor bearing arrangement structure, which is used to solve the technical problem that after the existing oil pump motor has been running for a long time, the outer rings of the front and rear bearings and the bearing chambers of the front and rear end covers of the motor are displaced or creeping, so as to effectively ensure the service life of the motor.
[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0010] An oil pump motor bearing arrangement structure includes: a motor main shaft, and a front bearing arrangement structure and a rear bearing arrangement structure; the front bearing arrangement structure includes: a motor flange end cover and a front bearing, and the rear bearing arrangement structure includes: a motor rear end cover, a wave spring and a rear bearing;
[0011] The motor main shaft connects the motor base, the motor flange end cover, the motor rear end cover, the front bearing and the rear bearing, and the front bearing is assembled in the front bearing chamber of the motor flange end cover, and the rear bearing is assembled in the rear bearing chamber of the motor rear end cover;
[0012] One end face of the outer ring of the front bearing contacts the inner step of the front bearing chamber, and the other end face of the inner ring of the front bearing contacts the shoulder of the motor main shaft, and positioning is performed by calculating the dimension chain;
[0013] One end face of the outer ring of the rear bearing contacts one side of the wave spring, and the other side of the wave spring contacts the step of the rear bearing chamber of the rear end cover of the motor. At the same time, the other end face of the inner ring of the rear bearing contacts the shoulder of the motor main shaft and is positioned by calculating the dimension chain; the wave spring compresses itself through the calculated dimension chain and has a certain elastic force.
[0014] In actual application, a semicircular positioning groove is provided on the outer ring of the front bearing, and a semicircular positioning groove of the same size is provided on the inner wall of the front bearing chamber of the motor flange end cover. During assembly, the two semicircular positioning grooves match each other and are connected in the middle by a circular positioning pin.
[0015] Among them, the outer ring end face of the front bearing adopts an annular pressure plate with a countersunk hole and is fixed to the front bearing chamber of the motor flange end cover by a hexagon socket screw. The annular pressure plate can not only be used to prevent axial movement of the circular locating pin, but also can be used to provide axial force to the outer ring of the front bearing to prevent the outer ring from creeping.
[0016] Specifically, two radial stop grooves are arranged on the outer ring of the rear bearing, and O-shaped sealing rings are arranged in the stop grooves, and when the rear bearing is assembled with the rear bearing chamber of the motor rear end cover, the O-shaped sealing rings are pressed due to the interference, so that the friction between the outer ring of the rear bearing and the motor rear end cover is increased, and the radial creep of the outer ring of the rear bearing is prevented, so that the rear bearing run-out phenomenon is avoided.
[0017] Compared with the prior art, the oil pump motor bearing arrangement structure has the following advantages:
[0018] In the oil pump motor bearing arrangement structure, one end surface of the outer ring of the front bearing is in contact with the inner step of the front bearing chamber, the other end surface of the inner ring of the front bearing is in contact with the shaft shoulder of the motor main shaft, and positioning is performed through the size chain. One end surface of the outer ring of the rear bearing is in contact with one side of the wave spring, and the other side of the wave spring is in contact with the step of the rear bearing chamber of the motor rear end cover, and the other end surface of the inner ring of the rear bearing is in contact with the shaft shoulder of the motor main shaft, and positioning is performed through the size chain. The wave spring is compressed through the size chain and has a certain elastic force. Therefore, the oil pump motor bearing arrangement structure has the front end positioning and rear end floating mode, so that the load borne by the floating end bearing can be greatly reduced, and displacement or creep phenomenon of the front and rear bearing outer rings and the front and rear end cover bearing chambers of the motor is avoided, so that the service life of the motor is effectively ensured. BRIEF DESCRIPTION OF DRAWINGS
[0019] Fig. 1 The oil pump motor bearing arrangement structure provided by the embodiment of the utility model is shown in the whole schematic view;
[0020] Fig. 2 The front bearing arrangement structure in the oil pump motor bearing arrangement structure provided by the embodiment of the utility model is shown in the partial schematic view;
[0021] Fig. 3 The rear bearing arrangement structure in the oil pump motor bearing arrangement structure provided by the embodiment of the utility model is shown in the partial schematic view.
[0022] REFERENCE NUMERALS:
[0023] 1-motor flange end cover; 2-circular positioning pin; 3-internal hexagonal screw; 4-annular pressing plate; 5-front bearing; 6-motor main shaft; 7-rear bearing; 8-O-shaped sealing ring; 9-wave spring; 10-motor rear end cover. DETAILED DESCRIPTION
[0024] In order to facilitate understanding, the oil pump motor bearing arrangement structure provided by the embodiment of the utility model is described in detail below in combination with the drawings of the specification.
[0025] The present invention provides an oil pump motor bearing arrangement structure, such as Figs. 1-3 As shown, it includes: a motor main shaft 6, and a front bearing arrangement structure and a rear bearing arrangement structure; the front bearing arrangement structure includes: a motor flange end cover 1 and a front bearing 5, and the rear bearing arrangement structure includes: a motor rear end cover 10, a wave spring 9 and a rear bearing 7;
[0026] The motor main shaft 6 connects the motor base, the motor flange end cover 1, the motor rear end cover 10, and the front bearing 5 and the rear bearing 7. The front bearing 5 is assembled in the front bearing chamber of the motor flange end cover 1, and the rear bearing 7 is assembled in the rear bearing chamber of the motor rear end cover 10.
[0027] One end face of the outer ring of the front bearing 5 contacts the inner step of the front bearing chamber, and the other end face of the inner ring of the front bearing 5 contacts the shoulder of the motor main shaft 6, and the positioning is achieved by calculating the dimension chain;
[0028] One end face of the outer ring of the rear bearing 7 contacts one side of the wave spring 9, and the other side of the wave spring 9 contacts the step of the rear bearing chamber of the rear end cover 10 of the motor. At the same time, the other end face of the inner ring of the rear bearing 7 contacts the shoulder of the motor main shaft 6 and is positioned by the calculated dimension chain; the wave spring 9 compresses itself through the calculated dimension chain and has a certain elastic force.
[0029] Compared with the prior art, the oil pump motor bearing arrangement structure described in the embodiment of the present invention has the following advantages:
[0030] In the oil pump motor bearing arrangement structure provided by the embodiment of the present invention, since one end face of the outer ring of the front bearing 5 contacts the inner step of the front bearing chamber, the other end face of the inner ring of the front bearing 5 contacts the shoulder of the motor main shaft 6, and is positioned by the calculated dimension chain; one end face of the outer ring of the rear bearing 7 contacts one side of the wave spring 9, and the other side of the wave spring 9 contacts the step of the rear bearing chamber of the rear end cover 10 of the motor, and at the same time, the other end face of the inner ring of the rear bearing 7 contacts the shoulder of the motor main shaft 6, and is positioned by the calculated dimension chain; the wave spring 9 compresses itself through the calculated dimension chain and has a certain elastic force. Therefore, the oil pump motor bearing arrangement structure provided by the embodiment of the present invention adopts a front-end positioning and rear-end floating method in which the front end of the motor is the driving end, thereby greatly reducing the load borne by the floating end bearing, thereby avoiding displacement or creep of the outer rings of the front and rear bearings and the front and rear end cover bearing chambers of the motor, thereby effectively ensuring the service life of the motor.
[0031] In actual application, such as Figs. 1-3As shown in the drawings, the outer ring of the front bearing 5 can be provided with a semicircular positioning groove, and the inner wall of the front bearing chamber of the motor flange end cover 1 can be provided with a semicircular positioning groove of the same size. When assembled, the two semicircular positioning grooves are matched and connected in the middle by the circular positioning pin 2.
[0032] Wherein, as Figs. 1-3 As shown in the drawings, the outer ring end face of the front bearing 5 can adopt an annular pressing plate 4 with a counterbore and be fixed with the motor flange end cover 1 through a hexagonal socket head cap screw 3. The annular pressing plate 4 can not only prevent the axial movement of the circular positioning pin 2, but also provide axial force for the outer ring of the front bearing 5 to prevent the outer ring from creeping.
[0033] Specifically, as Figs. 1-3 As shown in the drawings, the outer ring of the rear bearing 7 can be provided with two radial stop grooves, and an O-shaped sealing ring 8 is assembled in the stop groove. When the rear bearing 7 is assembled with the rear bearing chamber of the motor rear end cover 10, the O-shaped sealing ring 8 has a certain interference and is extruded, so as to increase the friction between the outer ring of the rear bearing 7 and the motor rear end cover 10, and prevent the radial creeping of the outer ring of the rear bearing 7 to avoid the phenomenon of the rear bearing 7 running out of the ring.
[0034] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. An oil pump motor bearing arrangement comprising: The motor main shaft, and the front bearing arrangement and the rear bearing arrangement; characterized in that the front bearing arrangement comprises a motor flange end cover and a front bearing, and the rear bearing arrangement comprises a motor rear end cover, a wave spring and a rear bearing; The motor main shaft connects the machine base, the motor flange end cover, the motor rear end cover, and the front bearing and the rear bearing, and the front bearing is assembled in the front bearing chamber of the motor flange end cover, and the rear bearing is assembled in the rear bearing chamber of the motor rear end cover; One end surface of the outer ring of the front bearing is in contact with the inner step of the front bearing chamber, and the other end surface of the inner ring of the front bearing is in contact with the shaft shoulder of the motor main shaft, and is positioned by a calculated size chain; One end surface of the outer ring of the rear bearing is in contact with one side of the wave spring, and the other side of the wave spring is in contact with the step of the rear bearing chamber of the motor rear end cover, and the other end surface of the inner ring of the rear bearing is in contact with the shaft shoulder of the motor main shaft, and is positioned by a calculated size chain; the wave spring is compressed by a calculated size chain and has a certain elastic force.
2. The oil pump motor bearing arrangement of claim 1, wherein, A semicircular positioning groove is arranged at the outer ring of the front bearing, and the inner wall of the front bearing chamber of the motor flange end cover is provided with a semicircular positioning groove of the same size, and the two semicircular positioning grooves are matched and connected by a circular positioning pin in the middle during assembly.
3. The oil pump motor bearing arrangement of claim 2, wherein, The outer ring end surface of the front bearing adopts an annular pressing plate with a counterbore and is fixed to the front bearing chamber of the motor flange end cover by an inner hexagonal screw, and the annular pressing plate can not only prevent the axial movement of the circular positioning pin, but also provide axial force for the outer ring of the front bearing to prevent the outer ring from creeping.
4. The oil pump motor bearing arrangement according to any one of claims 1 - 3, characterized in that, Two radial stop grooves are arranged at the outer ring of the rear bearing, and an O-ring is assembled in the stop groove, and when the rear bearing is assembled with the rear bearing chamber of the motor rear end cover, the O-ring has a certain interference and is extruded to increase the friction between the outer ring of the rear bearing and the motor rear end cover, and can prevent the radial creeping of the outer ring of the rear bearing to avoid the phenomenon of the rear bearing running out of the outer ring.