CN117927624A - Structure capable of stepless adjusting bearing pretightening force - Google Patents
Structure capable of stepless adjusting bearing pretightening force Download PDFInfo
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- CN117927624A CN117927624A CN202410215508.7A CN202410215508A CN117927624A CN 117927624 A CN117927624 A CN 117927624A CN 202410215508 A CN202410215508 A CN 202410215508A CN 117927624 A CN117927624 A CN 117927624A
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- nut
- pressing plate
- locking
- bearing
- pretightening force
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- 238000003825 pressing Methods 0.000 claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims abstract description 4
- 230000036316 preload Effects 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
Abstract
A structure capable of steplessly adjusting the pretightening force of a bearing comprises a fixed pressing plate, a pressing plate nut, a locking nut A and a locking nut B; the pressing plate nut, the locking nut A and the locking nut B are respectively provided with an inner hole, and the inner holes are sequentially enlarged; the pressing plate nut, the locking nut A and the locking nut B are sequentially connected with the fixed pressing plate through external threads to form a whole; the pressing plate nuts and the fixed pressing plates are positioned at two ends of the whole body, and the locking nuts A and the locking nuts B are clung and are positioned in the fixed pressing plates and are jointly used for locking the pressing plate nuts; after the integral installation, the stepless adjustment of the bearing pretightening force is realized by adjusting the depth of the external screw thread of the pressing plate nut screwed into the fixed pressing plate. According to the invention, the stepless adjustment of the bearing pretightening force is realized through the tightening position of the pressing plate nut, and compared with a method for adjusting the pretightening force of the gasket by using different thicknesses, the method can more conveniently and effectively realize accurate adjustment on the dynamic performance of the steering engine.
Description
Technical Field
The invention relates to a structure capable of steplessly adjusting bearing pretightening force, which is applied to the field of electric steering engines.
Background
The electric steering engine generally adopts a structure form of a motor, a gear reduction device and a ball screw. In order to improve the dynamic performance and stability of the low-frequency band of the steering engine, adjusting gaskets with different thicknesses can be assembled on the outer ring of the screw rod supporting bearing, so that the effect of applying different pretightening forces to the screw rod supporting bearing is achieved. However, the thickness of the gasket cannot be predicted and adjusted in advance in the existing structure, so that the problems that the gasket is required to be repeatedly disassembled and assembled, a large amount of waste is caused in the machining process, and the like are solved.
Disclosure of Invention
The invention aims to solve the technical problems that: the structure can be used for overcoming the defects of the prior art, and the bearing pretightening force can be adjusted steplessly, so that the aim of adjusting pretightening force of a screw rod support bearing can be fulfilled at will, the assembly efficiency can be greatly improved, and the machining cost can be reduced.
The invention aims at realizing the following technical scheme:
In a first aspect, the invention provides a structure capable of steplessly adjusting the pretightening force of a bearing, which comprises a fixed pressing plate, a pressing plate nut, a locking nut A and a locking nut B;
The pressing plate nut, the locking nut A and the locking nut B are respectively provided with an inner hole, and the inner holes are sequentially enlarged;
The pressing plate nut, the locking nut A and the locking nut B are sequentially connected with the fixed pressing plate through external threads to form a whole; the pressing plate nuts and the fixed pressing plates are positioned at two ends of the whole body, and the locking nuts A and the locking nuts B are clung and are positioned in the fixed pressing plates and are jointly used for locking the pressing plate nuts;
After the integral installation, the stepless adjustment of the bearing pretightening force is realized by adjusting the depth of the external screw thread of the pressing plate nut screwed into the fixed pressing plate.
Based on the first aspect, in an embodiment of the present invention, the pre-tightening force applied by the platen nut to the lead screw support bearing can be kept constant.
Based on the first aspect, in an embodiment of the present invention, the external threads of the lock nut a and the lock nut B are opposite.
Based on the first aspect, in an embodiment of the present invention, the inner holes of the pressing plate nut, the locking nut a and the locking nut B are hexagonal inner holes.
Based on the first aspect, in one embodiment of the present invention, the position of the pressing plate nut is first adjusted by using a tool, and then the lock nut a and the lock nut B are sequentially tightened.
Based on the first aspect, in one embodiment of the present invention, an initial amount of compression is set for the support bearing when the platen nut is installed.
Based on the first aspect, in one embodiment of the present invention, when the pretightening force on the support bearing needs to be increased, the pressing plate screw, the female lock nut a and the lock nut B are screwed one by one; when the pretightening force on the support bearing needs to be reduced, the lock nut B, the female lock nut A and the tightening pressing plate screw are unscrewed one by one.
Based on the first aspect, in an embodiment of the present invention, the initial position of the pressing plate nut is determined according to the distance from the outer circumferential end surface of the support bearing to the end surface of the steering engine housing, and the initial compression amount.
In a second aspect, the invention provides a method for using a structure based on the stepless adjustable bearing pretightening force, wherein a tool is used for firstly adjusting the position of a pressing plate nut and then sequentially screwing a lock nut A and a lock nut B.
Based on the second surface, in one embodiment of the invention, when the pretightening force on the support bearing needs to be increased, the pressing plate screw, the female lock nut A and the lock nut B are screwed one by one; when the pretightening force on the support bearing needs to be reduced, the lock nut B, the female lock nut A and the tightening pressing plate screw are unscrewed one by one.
Compared with the prior art, the invention has the following beneficial effects:
(1) Stepless adjustment of bearing pretightening force is achieved through the tightening position of the pressing plate nut, and compared with a method for adjusting gasket pretightening by utilizing different thicknesses, accurate adjustment can be achieved more conveniently and effectively on dynamic performance of a steering engine.
(2) For steering engine assembly, the thickness of the adjusting gaskets needed by each steering engine cannot be predicted in advance, and the design drawing can be matched with the adjusting gaskets with different sizes according to each product, so that a large amount of waste of the adjusting gaskets can occur. According to the invention, adjustment gaskets with different sizes do not need to be machined in advance, different pretightening forces on the screw rod support bearing can be directly realized through adjusting the positions of the pressing plate nuts, the machining cost of the adjustment gaskets is saved, and the production period of the steering engine is shortened.
(3) According to the invention, the inner holes of the nuts are designed in hexagonal shapes with different sizes, so that the pretightening force can be adjusted without disassembling mechanisms such as gears.
(4) The constant locking and the anti-loose of the pressing plate nuts are realized through a left-right-handed double-nut locking structure.
(5) The invention is applicable to all constructions involving the application of a preload to the bearing.
Drawings
FIG. 1 is a prior art construction for applying a preload force to a support bearing by an adjustment shim.
FIG. 2 is a schematic diagram of a support bearing compression measurement.
FIG. 3 is a schematic view of a platen assembly.
FIG. 4 is a schematic view of a platen assembly installation.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In the original structural design of the assembly of the electric steering engine, a screw rod supporting bearing is generally arranged on a ball screw rod, the ball screw rod provided with the screw rod supporting bearing is sleeved into a steering engine shell, the distance between a bearing pressing plate and the screw rod supporting bearing is measured, an adjusting gasket with the distance of 0.04-0.10mm is selected for assembly, then the bearing pressing plate is used for fixing, and parts such as a screw rod gear, a nut and the like are arranged at the tail end of the screw rod by using a flat key after the assembly, and the details are shown in figure 1. However, since the thickness dimension of each screw rod supporting bearing and the dimension of the bearing plate are not completely the same, the stability and dynamic performance index of the steering engine can be measured only after the steering engine is assembled and enters an electric test link, and if the index does not meet the requirement, the thickness of the gasket is required to be replaced and adjusted, the assembly risk of repeated disassembly and assembly is present, particularly, the disassembly of some flat keys and gears is involved, the risk of disassembly and scrapping of parts is possibly present, and meanwhile, the higher requirement is also provided for the assembly consistency; on the other hand, the thickness of the adjusting gaskets needed by each steering engine cannot be predicted in advance, the design drawing can be matched with a certain number of adjusting gaskets with different sizes according to each product, and each steering engine only uses one adjusting gasket with one size during actual assembly, so that a large amount of adjusting gaskets are wasted, and the machining cost is increased. In order to reduce repeated disassembly and assembly of the electric steering engine and improve the effectiveness of one-time assembly, a structural design capable of avoiding disassembly and continuously adjusting the pretightening force of the bearing is needed.
The invention aims to achieve the purpose of realizing stepless adjustment of the pretightening force without a disassembly mechanism by providing a structure for applying pretightening force to a support bearing, namely a pressing plate assembly. Stepless regulation of the pretightening force of the support bearing is realized through the split type pressing plate structure, so that the assembly efficiency is improved, and the economic cost is reduced.
Specific:
After the electric steering engine is installed on the screw rod supporting bearing, the pressing plate assembly is used for applying pretightening force to the supporting bearing.
A structure capable of steplessly adjusting the pretightening force of a bearing (hereinafter also referred to as a pressing plate assembly) comprises a fixed pressing plate, a pressing plate nut, a locking nut A and a locking nut B.
The pressing plate nut, the locking nut A and the locking nut B are sequentially connected with the fixed pressing plate through external threads, stepless adjustment of the pretightening force of the screw rod supporting bearing on the end face of the pressing plate nut can be realized through the screwing position of the pressing plate nut, and locking fixation of the position of the pressing plate nut is realized through the locking nut A and the locking nut B.
In order to ensure the stability of the dynamic characteristics of the steering engine, the pretightening force applied to the screw rod support bearing by the end face of the pressing plate nut is required to be kept constant, and therefore higher requirements are provided for the locking and the position fixing of the pressing plate nut. In the early test process, when only one lock nut A is used for locking the clamp plate nut, the amplitude frequency characteristic of the steering engine can be found to be changed under a certain vibration condition, the lock nut is found to have a loosening condition after decomposition, in order to solve the locking problem of the clamp plate nut, the lock nuts are increased into two, the thread directions of the lock nuts A are reversed, so that the external threads of the clamp plate nut, the lock nut A and the lock nut B form positive, reverse and positive thread directions, and a locking state is formed by fixing the clamp plate.
In order to realize the function of adjusting the pretightening force of parts such as a disassembly-free gear, the inner holes of the pressing plate nut, the locking nut A and the locking nut B are designed into hexagonal inner holes with different sizes from small to large, so that the positions of the pressing plate nut can be firstly adjusted by using a tool, the locking nut A and the locking nut B are sequentially screwed down, the pretightening force of the screw rod support bearing is quickly adjusted, and the product risk caused by repeated disassembly and assembly is avoided.
The specific using steps are as follows:
As shown in fig. 2, the distance from the outer circumferential end surface of the support bearing to the end surface of the steering engine shell is measured by using a depth gauge to obtain an initial value L1, and a pressing plate nut is screwed into an internal thread of the fixed pressing plate by taking the initial value of the distance as a reference, so that the distance between the bottom surface of the pressing plate nut and the lower end surface of the fixed pressing plate L2=L1+0.05mm, and at the moment, the initial compression amount of the support bearing is 0.05mm;
as shown in fig. 3, the lock nuts a and B are screwed into the inner circle of the fixed pressing plate one by one, and the pressing plate nut positions are locked, and at this time, the pressing plate assembly is assembled.
As shown in FIG. 4, the pressing plate assembly is arranged on the steering engine shell, when the pretightening force to the supporting bearing is required to be regulated, as the inner holes of the pressing plate nut, the locking nut A and the locking nut B are of a small inner hexagonal structure, other parts of the steering engine do not need to be disassembled, the locking nut B and the locking nut A are only required to be unscrewed one by one, the pressing plate nut can be rotated to regulate the distance L2, and thus the pretightening force to the supporting bearing is regulated, and the locking nut A and the locking nut B are screwed down after the pretightening force is regulated in place.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (10)
1. The structure capable of steplessly adjusting the pretightening force of the bearing is characterized by comprising a fixed pressing plate, a pressing plate nut, a locking nut A and a locking nut B;
The pressing plate nut, the locking nut A and the locking nut B are respectively provided with an inner hole, and the inner holes are sequentially enlarged;
The pressing plate nut, the locking nut A and the locking nut B are sequentially connected with the fixed pressing plate through external threads to form a whole; the pressing plate nuts and the fixed pressing plates are positioned at two ends of the whole body, and the locking nuts A and the locking nuts B are clung and are positioned in the fixed pressing plates and are jointly used for locking the pressing plate nuts;
After the integral installation, the stepless adjustment of the bearing pretightening force is realized by adjusting the depth of the external screw thread of the pressing plate nut screwed into the fixed pressing plate.
2. The structure for steplessly adjusting the preload of the bearing according to claim 1, wherein the preload applied to the screw support bearing by the platen nut can be kept constant.
3. The structure for stepless adjusting bearing pretightening force according to claim 1, wherein the external threads of the lock nut a and the lock nut B are opposite in direction.
4. The structure capable of steplessly adjusting the pretightening force of the bearing according to claim 1, wherein the inner holes of the pressing plate nut, the locking nut a and the locking nut B are hexagonal inner holes.
5. The structure for steplessly adjusting the preload of the bearing according to claim 1, wherein the position of the pressing plate nut is first adjusted by a tool, and then the lock nut a and the lock nut B are sequentially tightened.
6. The structure for steplessly adjusting the preload of the bearing as claimed in claim 5, wherein the initial compression amount is set for the support bearing when the pressing plate nut is installed.
7. The structure for steplessly adjusting the preload of the bearing according to claim 5, wherein the pressing plate screw, the female locking nut a and the locking nut B are screwed one by one when the preload of the support bearing needs to be increased; when the pretightening force on the support bearing needs to be reduced, the lock nut B, the female lock nut A and the tightening pressing plate screw are unscrewed one by one.
8. The structure of claim 5, wherein the initial position of the pressing plate nut is determined according to the distance from the outer circumferential surface of the support bearing to the end surface of the steering engine housing and the initial compression amount.
9. A method of using a structure based on the stepless adjustable bearing pretension according to claim 1, characterized in that the position of the pressing plate nut is first adjusted by means of a tool, and then the lock nut a and the lock nut B are sequentially tightened.
10. The method of using a structure capable of steplessly adjusting the preload of the bearing according to claim 9, wherein when the preload of the support bearing is required to be increased, the pressing plate screw, the female lock nut a and the lock nut B are screwed one by one; when the pretightening force on the support bearing needs to be reduced, the lock nut B, the female lock nut A and the tightening pressing plate screw are unscrewed one by one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410215508.7A CN117927624A (en) | 2024-02-27 | 2024-02-27 | Structure capable of stepless adjusting bearing pretightening force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410215508.7A CN117927624A (en) | 2024-02-27 | 2024-02-27 | Structure capable of stepless adjusting bearing pretightening force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117927624A true CN117927624A (en) | 2024-04-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410215508.7A Pending CN117927624A (en) | 2024-02-27 | 2024-02-27 | Structure capable of stepless adjusting bearing pretightening force |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117927624A (en) |
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2024
- 2024-02-27 CN CN202410215508.7A patent/CN117927624A/en active Pending
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