CN216157889U - Sliding bearing composite structure suitable for high-temperature environment transmission system cycloid pump - Google Patents
Sliding bearing composite structure suitable for high-temperature environment transmission system cycloid pump Download PDFInfo
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- CN216157889U CN216157889U CN202122282097.8U CN202122282097U CN216157889U CN 216157889 U CN216157889 U CN 216157889U CN 202122282097 U CN202122282097 U CN 202122282097U CN 216157889 U CN216157889 U CN 216157889U
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Abstract
The utility model belongs to the technical field of high-temperature environment engine transmission, and discloses a sliding bearing combination structure suitable for a high-temperature environment transmission system cycloid pump, which comprises at least 4 sliding bearings, wherein an interstage casing of the cycloid pump positions a pump shaft through the at least 4 sliding bearings, the sliding bearings are of an annular structure taking elastic steel as a main body, an opening with a broken end is arranged on the ring, and the size of the opening is 0.15-0.25 mm. The cycloid pump structure can be suitable for high-temperature working environment with the temperature of more than 300 ℃, and when the pump shell expands under heat and the interference magnitude of the sliding bearing is reduced, the interference between the sliding bearing and the pump shell can be ensured not to be reduced, and the relative motion is avoided; over-constraint effects can be formed by more than 4 constraint points, and even under the condition that the precision of each constraint is low, the over-constraint formed by a plurality of constraints can generate the mutual interference result, so that the higher positioning precision effect is achieved, and the normal work of the lubricating oil pump is ensured.
Description
Technical Field
The utility model belongs to the technical field of high-temperature environment engine transmission, relates to a cycloid pump of an engine accessory casing transmission system in a high-temperature environment, and particularly relates to a sliding bearing combination structure suitable for the cycloid pump of the high-temperature environment transmission system.
Background
The power shaft of the internally meshing gerotor pump is generally supported by a sliding bearing which is assembled on an inner bore of the interstage casing in an interference fit manner. In order to reduce the weight of the lubricating oil pump, the interstage casing is generally made of aluminum alloy materials, when the transmission system works in a high-temperature environment, the temperature of the lubricating oil pump is generally high and can reach over 300 ℃, because the interstage casing and the sliding bearing are made of different materials, the thermal expansion coefficient of aluminum alloy is large at high temperature, and the thermal expansion coefficient of steel and copper alloy is small, the interference magnitude between the interstage casing and the sliding bearing can be reduced along with the rise of the temperature, and if the interference degree of the sliding bearing is adjusted in advance, the positioning precision between the pump shaft and the sliding bearing is influenced.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to solve the problems, the utility model provides a sliding bearing combination structure suitable for a cycloid pump of a high-temperature environment transmission system, and the positioning precision of a sliding bearing is ensured.
The technical scheme of the utility model is as follows:
a sliding bearing combination structure suitable for a high-temperature environment transmission system cycloid pump comprises at least 4 sliding bearings, and a pump shaft is positioned on an interstage casing of the cycloid pump through the at least 4 sliding bearings.
Furthermore, an interstage casing of the cycloid pump positions a pump shaft through 4-8 sliding bearings. Only by adopting at least 4 sliding bearings, the constraint points of the cycloid pump can play a mutual over-constraint role, but not too much, and at most 8 sliding bearings are adopted.
Furthermore, all the sliding bearings are uniformly distributed along the axial direction of the pump shaft. The aim of this design is to distribute the constraining points as evenly as possible in the axial direction of the pump shaft.
Further, the sliding bearing is an elastic sliding bearing. When the working temperature of the oil pump gradually rises to be higher than 300 ℃, the clearance between the pump shaft and the interstage casing is increased, so that an elastic sliding bearing is adopted, and the interference degree between the sliding bearing and the interstage casing can be ensured not to be reduced through elastic compensation.
Furthermore, the sliding bearing is an annular structure with an elastic steel material as a main body, an opening with broken ends is arranged on the ring, and the size of the opening is 0.15 mm-0.25 mm. The elastic steel material is matched with the opening structure, so that the sliding bearing can obtain enough elasticity, and the problem that the interference magnitude between the interstage casing and the sliding bearing is reduced along with the rise of the temperature can be solved.
Furthermore, the ring section of the sliding bearing is divided into three layers from outside to inside, wherein the first layer is an elastic steel layer, the second layer is a bronze coating, and the third layer is a low-friction-coefficient resin layer. The structure not only ensures the strength and elasticity of the sliding bearing, but also can effectively reduce the friction coefficient of the contact surface.
The utility model has the following beneficial effects:
1. the cycloid pump structure can be suitable for high-temperature working environment with the temperature of more than 300 ℃, and when the pump shell expands under heat and the interference magnitude of the sliding bearing is reduced, the interference between the sliding bearing and the pump shell can be ensured not to be reduced, and the relative motion is avoided;
2. according to the utility model, a multi-constraint mode is adopted, over-constraint effects are formed by more than 4 constraint points, even under the condition that the precision of each constraint is low, the over-constraint formed by a plurality of constraints can generate a mutual interference result, and the result can effectively compensate the defect of a single constraint point, so that a higher positioning precision effect is achieved, and the normal work of the lubricating oil pump is ensured;
3. the sliding bearing has good strength and elasticity, and can effectively reduce the friction coefficient of a contact surface.
Drawings
FIG. 1 is a schematic view of a gerotor pump configuration in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a plain bearing in the practice of the utility model;
in the figure: the structure comprises a sliding bearing 1, an interstage casing 2, a pump shaft 3, a gear rotor 4, an elastic steel material layer 5, a bronze coating 6 and a low-friction-coefficient resin layer 7.
Detailed Description
This section is an example of the present invention and is provided to explain and illustrate the technical solutions of the present invention.
A sliding bearing combination structure suitable for a high-temperature environment transmission system cycloid pump comprises at least 4 sliding bearings 1, and an interstage casing 2 of the cycloid pump positions a pump shaft 3 through the at least 4 sliding bearings 1.
An interstage casing 2 of the cycloid pump positions a pump shaft 3 through 4-8 sliding bearings 1. Only by adopting at least 4 sliding bearings, the constraint points of the cycloid pump can play a mutual over-constraint role, but not too much, and at most 8 sliding bearings are adopted.
All the sliding bearings 1 are uniformly distributed in the axial direction of the pump shaft 3. The purpose of this design is to distribute the binding points as evenly as possible in the axial direction of the pump shaft 3.
The slide bearing 1 is an elastic slide bearing. When the working temperature of the oil pump gradually rises to above 300 ℃, the clearance between the pump shaft 3 and the interstage casing 2 is increased, so that an elastic sliding bearing is adopted, and the sliding bearing can ensure that the interference degree between the sliding bearing and the interstage casing 2 is not reduced through elastic compensation.
The sliding bearing is an annular structure with an elastic steel material as a main body, an opening with broken ends is arranged on the ring, and the size of the opening is 0.15-0.25 mm. The elastic steel material is fitted to the opening structure, so that the sliding bearing can obtain sufficient elasticity, and the problem that the interference between the interstage casing 2 and the sliding bearing 1 becomes smaller as the temperature rises can be solved.
The ring section of the sliding bearing 1 is divided into three layers from outside to inside, wherein the first layer is an elastic steel layer 5, the second layer is a bronze coating 6, and the third layer is a low-friction-coefficient resin layer 7. The structure not only ensures the strength and elasticity of the sliding bearing, but also can effectively reduce the friction coefficient of the contact surface.
The utility model can be realized by the following structure:
the power shaft of the internally engaged cycloidal rotor pump is generally supported by a sliding bearing 1, and the sliding bearing 1 is made of steel-based coated copper alloy materials and assembled on an inner hole of an interstage casing 2 in an interference fit mode. The sliding bearing 1 is formed by compounding three layers of materials, wherein: 5 is an elastic steel material layer, 6 is a bronze coating, and 7 is a low-friction-coefficient resin layer. The strength and the elasticity of the sliding bearing are guaranteed, the friction coefficient of a contact surface can be effectively reduced, the size of an opening is generally 0.15-0.25 mm, the opening is compressed during assembly and the assembly interference magnitude needs to be guaranteed, the opening is gradually opened after the temperature rises, and the influence of thermal expansion on the assembly interference magnitude is compensated. Because the sliding bearing 1 has elasticity, when the working temperature of the oil pump gradually rises to over 300 ℃, the interstage casing 2 is heated to expand, the interference magnitude of the sliding bearing 1 is reduced, and the sliding bearing 1 can ensure that the interference between the sliding bearing 1 and the interstage casing 2 is not reduced through elastic compensation, so that relative motion is avoided.
In order to reduce the weight of the lubricating oil pump, the interstage casing 2 is made of aluminum alloy materials generally, when the high-temperature environment transmission system works, the temperature of the lubricating oil pump is generally high and can reach over 300 ℃, because the interstage casing 2 and the sliding bearing 1 are made of different materials, the thermal expansion coefficient of aluminum alloy is large at high temperature, and the thermal expansion coefficient of steel and copper alloy is small, the interference magnitude between the interstage casing 2 and the sliding bearing 1 can be reduced along with the rise of the temperature, the sliding bearing 1 expands by means of the elasticity of the sliding bearing 1, the change of the interference magnitude between the sliding bearing 1 and the interstage casing 2 is compensated, and the interference magnitude between the sliding bearing 1 and the interstage casing 2 can be effectively ensured. However, in this case, the thickness of the sliding bearing 1 is not changed, the outer diameter is increased, the inner diameter is also increased, the estimated inner diameter can be increased by 0.07mm at most, the clearance between the pump shaft 3 and the sliding bearing 1 is increased, the positioning accuracy is reduced, the working condition is deteriorated, and the normal operation of the lubricating oil pump is affected.
Thus, in order to ensure the positioning accuracy of the pump shaft 3, at least 4 steel-based copper alloy-coated and plated sliding bearings 1 with 8 steel-based copper alloy materials are required to be used at the same time to form a combined structure, wherein the sliding bearings 1 are required to be uniformly distributed in the axial direction as much as possible, if each sliding bearing 1 is a constraint point, over-constraint effects are formed by more than 4 constraint points, even under the condition that the accuracy of each constraint is low, the over-constraint formed by multiple constraints can generate the mutual interference result, the result can effectively compensate the deficiency of a single constraint point, and thus, the high positioning accuracy effect can be achieved through the over-constraint, and the normal operation of the lubricating oil pump is ensured.
Claims (6)
1. A sliding bearing combination structure suitable for a high-temperature environment transmission system cycloid pump is characterized by comprising at least 4 sliding bearings (1), and an interstage casing (2) of the cycloid pump positions a pump shaft (3) through the at least 4 sliding bearings (1).
2. The sliding bearing combination structure suitable for the high-temperature environment transmission system cycloid pump of claim 1 is characterized in that the interstage casing (2) of the cycloid pump positions the pump shaft (3) through 4-8 sliding bearings (1).
3. A sliding bearing combination structure suitable for a high temperature environment transmission system cycloid pump according to claim 1, characterized in that all the sliding bearings (1) are evenly distributed along the axial direction of the pump shaft (3).
4. A sliding bearing combination suitable for a high temperature environment transmission system gerotor pump according to claim 1, characterized in that the sliding bearing (1) is an elastic sliding bearing.
5. The sliding bearing combination structure of the cycloid pump of claim 4 is characterized in that the sliding bearing is an annular structure with an elastic steel material as a main body, the ring is provided with a broken end opening, and the size of the opening is 0.15 mm-0.25 mm.
6. A sliding bearing combination structure suitable for a high-temperature environment transmission system cycloid pump according to claim 4, characterized in that the sliding bearing (1) has a ring section divided into three layers from outside to inside, wherein the first layer is an elastic steel layer (5), the second layer is a bronze coating (6), and the third layer is a low-friction-coefficient resin layer (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122282097.8U CN216157889U (en) | 2021-09-18 | 2021-09-18 | Sliding bearing composite structure suitable for high-temperature environment transmission system cycloid pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122282097.8U CN216157889U (en) | 2021-09-18 | 2021-09-18 | Sliding bearing composite structure suitable for high-temperature environment transmission system cycloid pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216157889U true CN216157889U (en) | 2022-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122282097.8U Active CN216157889U (en) | 2021-09-18 | 2021-09-18 | Sliding bearing composite structure suitable for high-temperature environment transmission system cycloid pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216157889U (en) |
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2021
- 2021-09-18 CN CN202122282097.8U patent/CN216157889U/en active Active
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