Positioning mechanism on motor rotating shaft

Abstract

A positioning mechanism on a motor rotating shaft belongs to the technical field of motor rotor fixation, and comprises a rotor body, a first bearing and a second bearing are sleeved on the outer side of the rotor body, the first bearing and the second bearing are respectively positioned at the front end and the rear end of the rotor body, and the rotor body comprises a first step part for supporting the first bearing; a first key groove is formed in the first step part, and a first polyurethane elastic rubber block is filled in the first key groove; a second step part for supporting the second bearing is further included, a second key groove is formed in the second step part, and a second polyurethane elastic rubber block is arranged in the second key groove. In order to solve the problem that a complex structure is adopted for fixing parts on an existing rotating shaft, the simple mechanism facilitating positioning of the parts on the rotating shaft is provided.

Description

Technical Field

[0001] The present application belongs to the technical field of motor rotor fixing, and in particular relates to a positioning mechanism on a motor shaft. Background Art

[0002] The high-speed rotor of the motor is supported by bearings at both ends, and the axial limit of the bearing relies on the bearing seat of the housing and the axial limit device on the rotor shaft. At present, the axial limit devices of the bearing on the commonly used rotor shaft mainly include shaft retaining springs and locking nuts. Shaft retaining springs will expand under the action of centrifugal force under high speed conditions. When the speed is high, the retaining spring may undergo plastic deformation, causing the retaining spring to fall out and fail. Therefore, shaft retaining springs are not suitable for high-speed working conditions; the locking nut device requires the processing of threaded structures on the rotor shaft, which is costly and has tightening torque requirements during assembly, making assembly inconvenient.

[0003] In a limiting structure of a high-speed shaft bearing of an electric new energy vehicle motor with publication number CN220156325U, a sleeve is provided on the front side of the second bearing, the inner side of the sleeve is interference fit with the rotor shaft, the sleeve and the rotor shaft are limited circumferentially through a keyway structure, the sleeve limits the front end of the inner ring of the second bearing, the outer side of the sleeve is sleeved with a round nut, the round nut and the inner sleeve are tightly fitted through threads, a plurality of coil spring pins are radially inserted into the rotor shaft, the positions of the coil spring pins correspond to the sleeve, and the first bearing can slide axially.

[0004] The applicant believes that this structure is not conducive to manufacturing and installation in the actual production process, and multiple coil spring pins will relax due to vibration during high-speed rotation and cannot play the role of positioning the bearing. Utility Model Content

[0005] The utility model aims to solve the problem that the existing parts on the rotating shaft are fixed with complex structures and provides a simple mechanism for facilitating the positioning of the parts on the rotating shaft.

[0006] In order to achieve the above technical objectives, the following technical solutions are provided: a positioning mechanism on a motor shaft, comprising a rotor body, a first bearing and a second bearing being sleeved on the outer side of the rotor body, the first bearing and the second bearing being respectively located at the front and rear ends of the rotor body, the rotor body comprising a first step portion supporting the first bearing, a first keyway being provided on the first step portion, and a first polyurethane elastic rubber block being filled in the first keyway; and also comprising a second step portion supporting the second bearing, a second keyway being provided on the second step portion, and a second polyurethane elastic rubber block being provided in the second keyway.

[0007] In the present technical solution, a polyurethane elastic rubber block is used to fix the bearing by forming a pin key structure to prevent it from rotating in the axial direction, and the hardness and wear resistance of the polyurethane rubber itself can be utilized to fix and seal the bearing and the rotating shaft.

[0008] In an embodiment, the kick surface of the first step portion faces the front end; the first keyway has an extension forward on the rotor body, so that after the first bearing contacts the kick surface of the first step portion, a gap is left between the front end of the first keyway and the first bearing.

[0009] In an embodiment, the kick surface of the second step portion faces the rear end; the rear end of the second keyway forms an opening on the rotor body, so that an opening is formed behind the second keyway after it is covered by the second bearing.

[0010] In an embodiment, the rotor body includes a third step portion supporting the stator, the kick portion of the third step portion faces the rear end, and the tread surface thereof is provided with evenly distributed grooves, and polyurethane elastic strips are embedded in the grooves.

[0011] In an embodiment, the rotor body further has a fourth step portion located at the front end as an output end, the kick portion of the fourth step portion faces the front end, a fourth key slot is opened on the fourth step portion, and a fourth polyurethane elastic rubber block or key block is filled in the fourth key slot.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The arrangement of multiple pin keys can effectively prevent the components on the tread of each step from rotating in the axial direction of the rotating shaft. Moreover, the key blocks and strips made of polyurethane elastic rubber injection molding with high hardness and high wear resistance can well replace the metal pin keys used in the prior art, and are easier to manufacture and install than metal pin keys. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 1 rotor body, 2 first bearing, 3 second bearing, 4 first step portion, 5 first keyway, 6 first polyurethane elastic rubber block, 7 second step portion, 8 second keyway, 9 second polyurethane elastic rubber block, 10 third step portion, 11 groove, 12 fourth step portion, 13 fourth keyway;

[0015] Figure 1 This is an overall schematic diagram of the installation of components on the rotor body of this embodiment;

[0016] Figure 2 is a front view of the rotor body of this embodiment;

[0017] Figure 3 This is an axial cross-sectional view of the rotor body of this embodiment after the components are installed; DETAILED DESCRIPTION

[0018] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] like Figure 1 , Figure 2 and Figure 3 The embodiment shown is a positioning mechanism on a motor shaft, comprising a rotor body 1, a first bearing 2 and a second bearing 3 are sleeved on the outer side of the rotor body 1, the first bearing 2 and the second bearing 3 are respectively located at the front and rear ends of the rotor body 1, the rotor body 1 comprises a first step portion 4 supporting the first bearing 2, a first keyway 5 is formed on the first step portion 4, and a first polyurethane elastic rubber block 6 is filled in the first keyway 5.

[0020] The kick surface of the first step portion 4 is toward the front end; the first keyway 5 has an extension forward on the rotor body 1, so that after the first bearing 2 contacts the kick surface of the first step portion 4, a gap is left between the front end of the first keyway 5 and the first bearing 2. In this embodiment, the first polyurethane elastic rubber block 6 can be filled in a block shape before installation and then the first bearing 2 is nested on the rotor body 1, or the polyurethane elastic rubber can be injected from the gap after the first bearing 2 is nested on the rotor body 1 to form a block shape that fits the first keyway 5.

[0021] The rotor body 1 includes a second step portion 7 supporting the second bearing 3, a second keyway 8 is provided on the second step portion 7, and a second polyurethane elastic rubber block 9 is provided in the second keyway 8. The kick surface of the second step portion 7 faces the rear end; the rear end of the second keyway 8 forms an opening on the rotor body 1, so that an opening is formed behind the second keyway 8 after it is covered by the second bearing 3. In this embodiment, the second polyurethane elastic rubber block 9 can be filled in a block shape before installation and then the second bearing 3 is nested on the rotor body 1, or the polyurethane elastic rubber can be injected from the opening after the second bearing 3 is nested on the rotor body 1 to form a block shape that fits the second keyway 8.

[0022] The rotor body 1 includes a third step portion 10 supporting the stator, the kick portion of the third step portion 10 faces the rear end, and the tread surface thereof is provided with evenly distributed grooves 11, and polyurethane elastic strips are embedded in the grooves 11. In the present application, the rotor magnet needs to be installed in the rotor body 1 first, and then the polyurethane elastic glue is injected into the grooves 11 to form the polyurethane elastic strips.

[0023] The rotor body 1 also has a fourth step portion 12 at the front end as an output end, the kick portion of the fourth step portion 12 faces the front end, a fourth key slot 13 is formed on the fourth step portion 12, and a fourth polyurethane elastic rubber block or a key block is filled in the fourth key slot 13. In this embodiment, the fourth key slot 13 is preferably filled with a key block.

[0024] On the rotor body 1, the components located in the middle of the entire rotor are first installed. In this embodiment, the rotor body 1 is installed first, and then the first bearing 2 and the second bearing 3 located at the ends are installed.

[0025] The above will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation.

[0026] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above-mentioned utility model, which fall within the scope of protection of the present invention.

Claims

1. A positioning mechanism on a motor shaft, comprising a rotor body (1), a first bearing (2) and a second bearing (3) being sleeved on the outer side of the rotor body (1), the first bearing (2) and the second bearing (3) being respectively located at the front and rear ends of the rotor body (1), It is characterized in that The rotor body (1) comprises a first stepped portion (4) supporting the first bearing (2), a first keyway (5) being provided on the first stepped portion (4), and a first polyurethane elastic rubber block (6) being filled in the first keyway (5); It also comprises a second stepped portion (7) supporting the second bearing (3), a second keyway (8) being provided on the second stepped portion (7), and a second polyurethane elastic rubber block (9) being provided in the second keyway (8).

2. The positioning mechanism on the motor shaft according to claim 1, characterized in that: The kick surface of the first step portion (4) faces the front end; the first keyway (5) has an extension forward on the rotor body (1), so that after the first bearing (2) contacts the kick surface of the first step portion (4), a gap is left between the front end of the first keyway (5) and the first bearing (2).

3. The positioning mechanism on the motor shaft according to claim 1 or 2, characterized in that: The kick surface of the second step portion (7) faces the rear end; the rear end of the second keyway (8) forms an opening on the rotor body (1), so that an opening is formed behind the second keyway (8) after it is covered by the second bearing (3).

4. The positioning mechanism on the motor shaft according to claim 3, characterized in that: The rotor body (1) comprises a third step portion (10) supporting the stator, the kick portion of the third step portion (10) faces the rear end, and evenly distributed grooves (11) are provided on its tread surface, and polyurethane elastic rubber strips are embedded in the grooves (11).

5. The positioning mechanism on the motor shaft according to claim 4, characterized in that: The rotor body (1) further comprises a fourth step portion (12) located at the front end as an output end, the kick portion of the fourth step portion (12) faces the front end, a fourth key groove (13) is provided on the fourth step portion (12), and a fourth polyurethane elastic rubber block or a key block is filled in the fourth key groove (13).

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