Tool for measuring symmetry degree of bearing after installation
By designing a tooling including a core shaft base and a top cover, and using the thickness difference to calculate the symmetry of the bearing relative to the housing, the low efficiency problem of the existing technology is solved, and efficient and accurate symmetry measurement is achieved.
Patent Information
- Application Number
- CN202422911460.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-11-27
AI Technical Summary
The existing method for measuring the symmetry of the bearing relative to the housing after installation is inefficient and difficult to meet the needs of mass production.
A tooling is used, including a core shaft base and a top cover. The symmetry of the bearing relative to the housing is calculated by measuring the thickness difference between the core shaft base and the top cover. The tooling consists of a core shaft base, a top cover and fasteners. The core shaft base is provided with a ring groove for positioning the bearing. The top cover is positioned on the bearing without interference and fixed by fasteners.
The efficiency of measuring the symmetry of the bearing relative to the housing is improved, the operation process is simplified, and the accuracy and efficiency of the measurement are improved.
Smart Images
Figure CN223346167U_ABST
Abstract
Description
Technical Field
[0001] The utility model discloses a tool for measuring symmetry, in particular to a tool for measuring the symmetry of a bearing relative to a housing after installation. Background Art
[0002] Bearings are important components that support mechanical rotation and swing, and are also common connecting elements in aircraft design. In some flight control components, in order to ensure the stability of force transmission, there are high requirements for the symmetry of the bearing relative to the housing after installation. Generally, the installation of the bearing requires the use of special tooling to ensure the initial symmetry of the bearing relative to the housing, and then it is fixed in the housing through fastening methods such as punching, grooving, and riveting. When fixing the bearing, the bearing will produce a certain displacement due to local structural deformation, and the symmetry will also change to a certain extent. At present, the symmetry of the bearing relative to the housing after fixation is generally measured by CNC measurement, but this method is extremely inefficient and difficult to cope with large-scale production tasks. Utility Model Content
[0003] The utility model aims to provide a tool for measuring the symmetry of a bearing after installation, so as to solve the problem that the traditional method of measuring the symmetry of the bearing relative to the housing after installation has high equipment requirements and low efficiency.
[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a tool for measuring the symmetry of a bearing after installation, the tool comprising a core shaft base and a top cover; the core shaft base comprises a core shaft and a base, one end of the core shaft is fixed to the base, and the other end is a free end, and an annular groove is provided on the base, which is arranged around the core shaft and is used to accommodate the part of the bearing protruding from its fixed housing; a through hole is provided in the top cover for the core shaft to pass through; when the bearing is inserted into the core shaft, the bearing and the housing for fixing the bearing are placed on the base, and the top of the core shaft presses the top cover onto the top of the bearing through a fastener.
[0005] Preferably, the core shaft is fixed at the center of the base; the outer diameter of the base is larger than the outer diameter of the housing of the fixed bearing.
[0006] Preferably, the core shaft is a stepped shaft, and the through hole in the top cover is a stepped hole.
[0007] Preferably, the outer diameter of the top cover pressed on the top of the bearing is smaller than the diameter of the bearing mounting hole, and the inner hole diameter is larger than the diameter of the bearing inner ring.
[0008] Preferably, the diameter of the annular groove is larger than the diameter of the bearing mounting hole.
[0009] Preferably, the fastener is a fastening nut, which is threadedly connected to the top of the core shaft.
[0010] Working principle: The tooling mainly consists of two key components: the core shaft base and the top cover. The housing after the bearing is pressed is installed on the tooling twice in turn, and the thickness of the tooling is recorded twice. Finally, the symmetry of the bearing relative to the housing can be obtained by subtracting the two measured tooling thicknesses.
[0011] Compared with the prior art, the utility model has the following advantages: the tool is easy to use and greatly improves the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic structural diagram of an embodiment of the utility model;
[0013] Figure 2 This is a cross-sectional view of an embodiment of the utility model;
[0014] Figure 3 This is a state diagram of the embodiment of the utility model (①: front side measurement; ②: back side measurement);
[0015] Figure 1-2 In the figure, 1-fastening nut; 2-top cover; 3-parts behind the fixed bearing; 4-spindle base. DETAILED DESCRIPTION
[0016] The following is combined with Figure 1-3 The utility model is further described in detail: a tool for measuring the symmetry of a bearing after installation, such as Figure 1-2 As shown, it is mainly composed of a top cover 2, a core shaft base 4 and a fastening nut 1; the core shaft base 4 includes a core shaft and a base. The function of the core shaft is to locate the bearing position. The diameter of the ring groove on the core shaft base 4 is larger than the diameter of the bearing mounting hole, and it is positioned on the end face of the shell; the outer circle diameter of the top cover is smaller than the diameter of the bearing mounting hole, and the inner hole diameter is larger than the diameter of the bearing inner ring, so it can be positioned on the bearing outer ring without interference.
[0017] As a preferred implementation of this embodiment, the core shaft is fixed at the center of the base; the outer diameter of the base is larger than the outer diameter of the part 3 after the bearing is fixed.
[0018] As a preferred implementation of this embodiment, the core shaft is a stepped shaft, its large shaft section is used to locate the bearing position, and its small shaft section is used to install the fastening nut 1; the inner hole of the top cover is a stepped hole, and each transition end is pressed on the end face of the bearing outer ring and the bearing inner ring respectively.
[0019] like Figure 3 As shown, according to the structure shown in the figure, the following two equations are obtained according to the front measurement state and the back measurement state:
[0020] δ=LA+LD+LC+LB- L1 ①
[0021] δ= L2-(LA+LD+LC+LB) ②
[0022] Among them, LA is the thickness of the top cover, LB is the thickness of the core shaft base, LC is half of the shell thickness, and LD is half of the bearing thickness. The four dimensions LA, LB, LC, and LD will not change each time they are measured (these four values will not change when measuring the front and back sides), and L1 and L2 are the actual measured values of the front and back sides respectively. Then, by adding both sides of equation ① and equation ②, the symmetry 2δ=L2-L1 can be obtained.
[0023] How to use: Figure 1-2 As shown, when in use, insert the bearing into the core shaft, place the bearing and the part 3 after fixing the bearing on the base, and press the top cover 2 onto the top of the bearing through the fastening nut 1 on the top of the core shaft; use the tool to clamp the parts twice in the forward and reverse directions, and then measure the height of the end cover core shaft base. The difference between the two measurements is the symmetry of the bearing relative to the housing.
[0024] The above embodiments are merely preferred embodiments of the present invention and do not limit the present invention. Any extensions or modifications made by those skilled in the art without departing from the principles of the present invention shall fall within the scope of protection of the present invention.
Claims
1. A tool for measuring the symmetry of a bearing after installation, characterized by: The tooling includes a core shaft base and a top cover; the core shaft base includes a core shaft and a base, one end of the core shaft is fixed to the base, and the other end is a free end, and an annular groove is provided on the base, which is arranged around the core shaft and is used to accommodate the part of the bearing protruding from its fixed housing; a through hole is provided in the top cover for the core shaft to pass through; when the bearing is inserted into the core shaft, the bearing and the housing for fixing the bearing are placed on the base, and the top of the core shaft presses the top cover onto the top of the bearing through a fastener.
2. The tool for measuring the symmetry of a bearing after installation according to claim 1, characterized in that: The core shaft is fixed at the center of the base; the outer diameter of the base is larger than the outer diameter of the housing of the fixed bearing.
3. The tool for measuring the symmetry of a bearing after installation according to claim 1, characterized in that: The core shaft is a stepped shaft, and the through hole of the top cover is a stepped hole.
4. The tool for measuring the symmetry of a bearing after installation according to claim 3, characterized in that: The outer diameter of the top cover pressed on the top of the bearing is smaller than the diameter of the bearing mounting hole, and the inner hole diameter is larger than the diameter of the bearing inner ring.
5. The tool for measuring the symmetry of a bearing after installation according to claim 1, characterized in that: The diameter of the ring groove is larger than the diameter of the bearing mounting hole.
6. The tool for measuring the symmetry of a bearing after installation according to claim 1, characterized in that: The fastener is a fastening nut, which is threadedly connected to the top of the core shaft.