A pre-pressing tool for pre-pressing a bearing of a brushless direct current motor

Abstract

The utility model relates to the technical field of pressure maintaining frock, propose a kind of brushless direct current motor bearing pre-pressure pressure maintaining frock, it can assist relatively assembled first bearing and second bearing form the relative guide positioning between both, and operation is more convenient, practicality is better, including frock body, first bearing and second bearing, still include pivot, frock body is divided into first frock and second frock two parts, first frock is provided with bearing channel for placing first bearing and second bearing in, annular groove is designed in second frock, magnet is placed in annular groove, first frock adopts material that can be magnetically attracted by magnet, first frock is attracted by magnet, spring is arranged between first bearing and second bearing, pivot passes first bearing and second bearing in turn.

Description

Technical Field

[0001] This utility model relates to the field of pressure holding fixture technology, specifically to a pre-pressure holding fixture for a brushless DC motor bearing. Background Technology

[0002] As is well known, the installation of the rotor bearing of a brushless DC motor is a critical step, and its installation quality directly affects the performance and lifespan of the motor. To ensure the installation quality of the rotor bearing of the brushless DC motor, we have designed a special bearing pre-pressure holding fixture to ensure the accuracy and stability of the bearing installation.

[0003] A search revealed that Chinese patent application number CN201820917248.8 discloses an integrated high-speed motor rotor using shaft-connected bearings. The general description includes a spindle, a permanent magnet ring mounted on the spindle, inner raceways for steel balls at both ends of the spindle, an outer bearing ring fitted onto the inner raceways, an outer raceway for steel balls on the inner circumferential surface of the outer bearing ring, steel balls positioned between the inner and outer raceways, and a steel ball retainer positioned between the inner and outer raceways, with the steel balls located within the steel ball retainer.

[0004] In the process of installing bearings on shafts, most existing technical solutions, including the above-mentioned ones, adopt pre-positioning and pressure holding to fix the outer ring of the bearing and the spring within a predetermined size, thereby generating pre-pressure on the inner and outer rings of the bearing to eliminate bearing clearance. However, since the size positioning cannot be precisely controlled, two consequences will occur: First, if the size is too small, the pre-pressure will be too large, and the high-speed operation of the bearing will increase friction and cause noise; second, if the size is too large, the pre-pressure will be too small, and the bearing clearance cannot be completely eliminated. When the bearing is running at high speed, the steel ball track inside the bearing will shift, causing noise. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a pre-pressure holding fixture for brushless DC motor bearings, which can assist in the relative alignment and positioning of the first and second bearings being assembled relative to each other. It is also more convenient to operate and has better practicality.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pre-pressure holding fixture for a brushless DC motor bearing, comprising a fixture body, a first bearing and a second bearing, and a rotating shaft. The fixture body is divided into two parts: a first fixture and a second fixture. The first fixture has a bearing channel for accommodating the first bearing and the second bearing. The second fixture has an annular groove, in which a magnet is placed. The first fixture is made of a material that can be attracted by the magnet. The magnet attracts the first fixture together. A spring is provided between the first bearing and the second bearing. The rotating shaft passes through the first bearing and the second bearing sequentially.

[0007] Preferably, a positioning sleeve is embedded in the bearing channel within the first tooling.

[0008] Preferably, the second tooling is designed with a raised positioning post, which is used for positioning the bearing channel in the first tooling, so as to facilitate positioning and guidance when the first tooling and the second tooling are joined together.

[0009] Preferably, the bearing channel tolerance in the first tooling is +0.005 to 0.0 mm.

[0010] Preferably, the tolerance of the protruding positioning post in the second tooling is -0.00 to -0.005 mm.

[0011] Preferably, the first tooling is provided with a first anti-slip groove.

[0012] Preferably, the second tooling is provided with a second anti-slip groove.

[0013] Compared with the prior art, this utility model provides a pre-pressure holding fixture for brushless DC motor bearings, which has the following beneficial effects:

[0014] (1) In this utility model, the tooling body is designed to form an auxiliary set positioning with the outer ring surface of the first bearing and the outer ring surface of the second bearing, so as to facilitate the auxiliary centering positioning of the first bearing and the second bearing through the outer ring surface.

[0015] (2) In this utility model, by using magnets, the first tooling is positioned relative to the second tooling to form an auxiliary connection, making the operation more convenient and the practicality better. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the assembly of this utility model.

[0017] Figure 2 An exploded view of the assembly of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the first tooling of this utility model;

[0019] Figure 4 This is a cross-sectional structural schematic diagram of the first tooling of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the second tooling of this utility model;

[0021] Figure 6 This is a cross-sectional structural schematic diagram of the second tooling of this utility model;

[0022] Figure 7 This is a cross-sectional view of the assembled product of this utility model;

[0023] Figure 8 This is a picture of the assembled product of this utility model.

[0024] In the diagram: A-1--First tooling; B-1--Second tooling; B-2--Magnet; A-2--Positioning sleeve; B-1-2--Protruding positioning post; A-1-1--First anti-slip groove; B-1-1--Second anti-slip groove; 7--Rotating shaft; 8--First bearing; 9--Spring; 10--Second bearing. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] For examples, please refer to Figures 1-8 A pre-pressure holding fixture for a brushless DC motor bearing includes a fixture body, a first bearing 8 and a second bearing 10, and a rotating shaft 7. The fixture body is divided into two parts: a first fixture A-1 and a second fixture B-1. The first fixture A-1 has a bearing channel for accommodating the first bearing 8 and the second bearing 10. The second fixture B-1 has an annular groove in which a magnet B-2 is placed. The first fixture A-1 is made of a material that can be magnetically attracted by the magnet B-2. The first fixture A-1 is attracted to the second fixture B-1 by the magnet B-2, and the first fixture A-1 forms an auxiliary connection and positioning relative to the second fixture B-1, making operation more convenient and practical.

[0027] Furthermore, a spring 9 is provided between the first bearing 8 and the second bearing 10. The rotating shaft 7 passes through the first bearing 8 and the second bearing 10 successively, forming an auxiliary fitting positioning with the outer ring surfaces of the first bearing 8 and the second bearing 10. This facilitates the auxiliary centering and positioning of the first bearing 8 and the second bearing 10 via their outer ring surfaces. A positioning sleeve A-2 is embedded in the bearing channel within the first tooling A-1 to assist in the clamping and positioning of the first bearing 8 installed in the first tooling A-1. The second tooling B-1 is designed with a protruding positioning post B-1-2, which is used for positioning the bearing channel within the first tooling A-1, facilitating the positioning of the first tooling A-1 and the second bearing 10. The positioning and alignment of tooling B-1 when closed; the bearing channel tolerance in the first tooling A-1 is +0.005 to 0.0mm, ensuring the fit with the first bearing 8 and the second bearing 10, facilitating the installation and removal of the first bearing 8 and the second bearing 10; the tolerance of the protruding positioning post B-1-2 in the second tooling B-1 is -0.00 to -0.005mm, facilitating the installation of the protruding positioning post B-1-2 relative to the bearing channel; the first tooling A-1 is provided with a first anti-slip groove A-1-1, facilitating the installation and positioning of the first tooling A-1; the second tooling B-1 is provided with a second anti-slip groove B-1-1, facilitating the installation and positioning of the second tooling B-1.

[0028] In summary, the working principle of this brushless DC motor bearing preload pressure holding fixture is as follows: during use, the first bearing 8 and the rotating shaft 7 are fixed according to the predetermined dimensions, then glue is applied to the rotating shaft 7 and it is placed inside the first fixture A-1. Then, the spring 9 is fitted on the rotating shaft 7, and the second bearing 10 is fitted into the rotating shaft 7. Then, the second fixture B-2 is fitted into the first fixture A-1 to maintain pressure. After the second bearing 10 is installed, other components are assembled.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-pressure holding fixture for a brushless DC motor bearing, comprising a fixture body, a first bearing (8), and a second bearing (10), characterized in that, It also includes a rotating shaft (7). The tooling body is divided into two parts: a first tooling (A-1) and a second tooling (B-1). The first tooling (A-1) is provided with a bearing channel for placing the first bearing (8) and the second bearing (10). The second tooling (B-1) is designed with an annular groove. A magnet (B-2) is placed in the annular groove. The first tooling (A-1) is made of a material that can be attracted by the magnet (B-2). The first tooling (A-1) is attracted by the magnet (B-2). A spring (9) is provided between the first bearing (8) and the second bearing (10). The rotating shaft (7) passes through the first bearing (8) and the second bearing (10) in turn.

2. The brushless DC motor bearing preload holding fixture according to claim 1, characterized in that, The bearing channel inside the first tooling A-1 is fitted with a positioning sleeve (A-2).

3. The brushless DC motor bearing preload holding fixture according to claim 2, characterized in that, The second tooling (B-1) is designed with a raised positioning post (B-1-2), which is used for positioning the bearing channel in the first tooling (A-1) to facilitate positioning and guidance when the first tooling (A-1) and the second tooling (B-1) are joined.

4. The brushless DC motor bearing preload holding fixture according to claim 3, characterized in that, The bearing channel tolerance in the first tooling (A-1) is +0.005^0.0mm.

5. The brushless DC motor bearing preload holding fixture according to claim 4, characterized in that, The tolerance of the protruding positioning pin (B-1-2) in the second tooling (B-1) is -0.00 to -0.005 mm.

6. The brushless DC motor bearing preload holding fixture according to claim 5, characterized in that, The first tooling (A-1) is provided with a first anti-slip groove (A-1-1).

7. The brushless DC motor bearing preload holding fixture according to claim 6, characterized in that, The second tooling (B-1) is provided with a second anti-slip groove (B-1-1).

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