Turning clamp for brushless generator rotor

Abstract

The utility model relates to the field of machining, in particular to a brushless generator rotor turning clamp which comprises a front ejector pin, a mounting disc arranged on one side of the front ejector pin and a plurality of rotating shafts arranged on the mounting disc at equal intervals in the circumferential direction. The front ejector pin comprises a clamping part and an ejector head part which are integrally connected and coaxial, the clamping part is clamped and matched with the chuck, the rotor comprises a claw pole and a middle shaft which are integrally connected and coaxial, the ejector head part penetrates through the mounting disc in a sliding mode and abuts against one end of the middle shaft on the rotor, and a plurality of mounting screw holes are formed in the side, away from the front ejector pin, of the mounting disc in a penetrating mode. The rotating shafts are in one-to-one correspondence and penetrate through the mounting screw holes in a threaded mode, the rotating shafts are sleeved with fixing nuts in a threaded mode, one sides of the fixing nuts abut against the mounting disc, and the end, away from the mounting disc, of the rotor abuts against a rear ejector pin. According to the rotor turning fixture, the structure of the rotor turning fixture is improved, so that the rotor turning fixture can meet the machining requirements of different types of rotors, the fixture is simplified, and the turning efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of machining, and in particular to a turning fixture for a brushless generator rotor. Background Art

[0002] The rotor is an important component of an automotive generator. The rotor applied to a brushless generator is composed of a rotating shaft, main claw poles, auxiliary claw poles, and a steel ring. It transmits the power of an internal combustion engine through a belt and rotates the rotor. When the magnetic field generated by the excitation of the generator magnetizes the main claw poles and auxiliary claw poles of the rotor, the rotation of the rotor means the rotation of the magnetic field, cutting the wires in the stator core and generating an induced current.

[0003] The rotating shaft of the rotor often adopts the method of being pressed into the claw pole hole of the rotor. If there are problems such as eccentricity or poor perpendicularity between the rotating shaft and the end face of the claw pole. In the case of high-speed rotation, if the outer diameter accuracy of the rotor is insufficient or the end face runout is too large, it may cause the gap between the rotor and the stator to become smaller or even contact, thus increasing the risk of collision between the rotor and the stator. At the same time, the processing quality of the rotor directly affects the magnitude of the induced current and the service life of the generator.

[0004] In the prior art, usually by additionally installing sensors, motors, cylinders, or position control mechanisms, etc., the position of the fixture can be adjusted, but it is applicable to specific types of rotors, resulting in limited flexibility and unable to be applicable to multiple types of rotors simultaneously. Utility Model Content

[0005] In order to improve the structure of the turning fixture for the rotor so that it can be applicable to different models of rotors and achieve rapid switching of the fixture, this application provides a turning fixture for a brushless generator rotor.

[0006] The turning fixture for a brushless generator rotor provided by this application adopts the following technical solution:

[0007] A turning fixture for a brushless generator rotor includes a front center, one end of which is connected to a chuck, an installation disc arranged on the side of the front center away from the chuck, and a plurality of rotating shafts arranged at equal intervals along the circumference on the installation disc. One end of the plurality of rotating shafts away from the installation disc jointly abuts against a rotor. The front center includes a clamping portion and a top head portion that are integrally connected and coaxial. The clamping portion is in clamping fit with the chuck. The rotor includes a claw pole and a central axis that are integrally connected and coaxial. The top head portion slides through the installation disc and abuts against one end of the central axis on the rotor. A plurality of installation screw holes are penetrated on the side of the installation disc away from the front center. The plurality of rotating shafts are respectively and threadedly penetrated in the plurality of installation screw holes. A fixing nut is threadedly sleeved on the rotating shaft. One side of the fixing nut abuts against the installation disc. A rear center abuts against one end of the rotor away from the installation disc.

[0008] By adopting the above technical solution, when the fixture clamps and fixes different rotors, since the axial lengths of different rotors are not the same, the fixture can adjust the distance between the end of the rotating shaft and the mounting plate through the threaded structure, and then the top head on the front center punch and the rear center punch jointly form a clamping effect on the rotor along the axis, enabling the fixture to adapt to more different types of rotors. At the same time, several rotating shafts jointly form an abutment on the rotor along the circumference, so that the rotor can maintain a balanced force in the radial direction, improving the machining accuracy during the turning of the rotor.

[0009] Optionally, a plurality of groups of the mounting screw holes are formed in the mounting plate. The distances from a plurality of the mounting screw holes in the same group to the center of the mounting plate are equal, and the plurality of groups of the mounting screw holes are equally spaced along the radial direction of the mounting plate.

[0010] By adopting the above technical solution, several rotating shafts can be passed through the mounting screw holes in different groups through the adjusting threads, so that the fixture can achieve complete abutment for rotors with different lateral dimensions, avoiding the situation that some positions on the rotor are unevenly stressed during the turning process, and finally causing excessive machining errors, and improving the stability of the structure of the fixture for clamping the rotor.

[0011] Optionally, the number of the mounting screw holes in the same group is an even number, and a plurality of the mounting screw holes in the same group are equally spaced along the circumferential direction of the mounting plate.

[0012] By adopting the above technical solution, during the process of the rotor being clamped by the fixture, the force on the rotor in the radial plane can be balanced, and the center balance point of the force on the rotor coincides with the axis of the rotor, avoiding the situation that the rotor undergoes a small offset in the diameter direction due to the tangential force during the turning process, resulting in an eccentric motion, and then reducing the product qualification rate.

[0013] Optionally, mounting platforms for clamping by a wrench are formed on several of the rotating shafts. There are two mounting platforms on the same rotating shaft, and the two mounting platforms are symmetrically distributed along the axis of the rotating shaft.

[0014] By adopting the above technical solution, it enables the operator to more conveniently adjust the distance between the rotating shaft and the mounting plate along the axis, preventing the side of the rotating shaft from being damaged during the adjustment process due to unreasonable operation, and finally shortening the service life of the rotating shaft.

[0015] Optionally, the rotating shaft includes a fixed shaft and a movable shaft. The fixed shaft is in threaded connection with the mounting plate. The movable shaft is threadedly sleeved on one end of the fixed shaft away from the mounting plate. The two mounting platforms are both formed on the movable shaft. A plurality of docking grooves are formed in the circumferential direction on one side of the claw pole close to the mounting plate. One end of the movable shaft away from the fixed shaft is slidably matched in the docking grooves.

[0016] By adopting the above technical solution, the adjustable range of the rotating shaft is larger, so as to facilitate the clamping requirements of more different types and sizes of rotors. And since the distance between the moving shaft and the fixed shaft is mainly adjusted when adjusting the rotating shaft, and the fixed shaft is threadedly connected to the mounting plate, the connection structure between the fixture parts is more stable.

[0017] Optionally, a plurality of connection holes are symmetrically and penetratingly formed in the mounting plate, and a plurality of screws are respectively disposed in the plurality of connection holes. The end portions of the plurality of screws away from the mounting plate are threadedly disposed in the clamping portion.

[0018] By adopting the above technical solution, using screws to connect the front center with the mounting plate not only ensures the stability of the connection structure, but also facilitates the replacement of the front center when it is damaged. At the same time, since the top head is slidably connected to the mounting plate, the distance between the mounting plate and the clamping portion can also be adjusted, improving the flexibility of the fixture adjustment.

[0019] Optionally, the radius of the clamping portion is smaller than the minimum distance between the mounting screw hole and the axis of the mounting plate.

[0020] By adopting the above technical solution, when the rotating shaft rotates, the clamping portion will not hinder the adjustment process of the rotating shaft. At the same time, the smaller lateral dimension of the clamping portion is also convenient for the chuck to clamp the front center and reduce the overall mass of the fixture.

[0021] Optionally, the rear center adopts a live center.

[0022] By adopting the above technical solution, the top end of the rear center is arranged in the tapered hole at the end position of the central axis of the rotor in a sliding fit manner. This design makes there be no relative movement between the ball head of the rear center and the workpiece, thereby improving the machining accuracy and extending the service life of the fixture.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. By designing an adjustable turning fixture structure, the present application realizes the applicability to rotors of different types and sizes, improving the applicable range of the rotor turning fixture;

[0025] 2. The rotating shaft of the present application allows for flexible positioning according to the specific structural characteristics of the rotor to be machined. By simply adjusting the position of the rotating shaft, the machining requirements of different types of rotors can be adapted without disassembling or replacing other fixture components in the device, thus significantly improving the machining conversion efficiency;

[0026] 3. In the present application, the front ejector pin and the rear ejector pin are designed with an independent structure with respect to the rotating shaft. This design allows for the replacement of only the damaged component when a certain component needs to be replaced due to wear, without affecting other components, thus simplifying the maintenance process of the fixture and improving its usage efficiency. Brief Description of the Drawings

[0027] Figure 1 is a schematic diagram of the overall structure of a turning fixture for a brushless generator rotor of the present application.

[0028] Figure 2 is Figure 1 an enlarged view of part A in

[0029] Description of the Reference Numerals: 1, front ejector pin; 11, clamping portion; 12, ejecting head portion; 2, mounting disk; 21, mounting screw holes; 22, connection holes; 3, rotor; 31, claw pole; 311, docking groove; 32, central axis; 4, rotating shaft; 41, fixed shaft; 42, moving shaft; 421, mounting platform; 5, fixing nut; 6, rear ejector pin; 7, screw. Detailed Description of the Embodiment

[0030] The following further elaborates on the present application in conjunction with the Figure 1-2 drawings.

[0031] The embodiment of the present application discloses a turning fixture for a brushless generator rotor.

[0032] Referring to Figure 1 and Figure 2 , a turning fixture for a brushless generator rotor includes a front ejector pin 1 whose one end is connected to a chuck, a rotor 3 abutted against one end of the front ejector pin 1 along the axis, a mounting disk 2 fixedly connected to the front ejector pin 1 and abutted against one side, and a plurality of rotating shafts 4 threadedly passing through the mounting disk 2. The rotor 3 is an integral structure and includes a claw pole 31 and a central axis 32 that are coaxial. The front ejector pin 1 includes a clamping portion 11 and an ejecting head portion 12 that are integrally connected, wherein the clamping portion 11 is fixedly clamped with the chuck, and the ejecting head portion 12 abuts against one end of the central axis 32 on the rotor 3 and is slidably connected to the mounting disk 2. The end of the ejecting head portion 12 is a conical structure and is coaxial with the mounting disk 2 to prevent the rotor 3 from being eccentric during the machining process.

[0033] A number of mounting screw holes 21 corresponding one-to-one with the rotating shafts 4 are perforated through the mounting disk 2, and a number of rotating shafts 4 are threaded through the number of mounting screw holes 21, so that when dealing with rotors 3 of different types and sizes, the fixture can be adjusted to fit the rotor 3, achieving complete positioning of the rotor 3. A number of docking grooves 311 are circumferentially formed on one side of the claw pole 31 on the rotor 3 close to the mounting disk 2, and one ends of the number of rotating shafts 4 away from the mounting disk 2 all abut against the inside of the docking grooves 311, achieving lateral positioning of the rotor 3. Threaded sleeves 5 for fixing the rotating shafts 4 are sleeved on the number of rotating shafts 4, and one side of the fixing nut 5 abuts tightly against the side of the mounting disk 2 away from the clamping portion 11. A rear center pin 6 abuts against one end of the central shaft 32 on the rotor 3 away from the mounting disk 2, and the rear center pin 6, together with the rotating shafts 4 and the top head portion 12 on the front center pin 1, jointly act to form complete axial limitation on the rotor 3.

[0034] Preferably, the rear center pin 6 in this application adopts the structure of a live center. The purpose is to make the tip portion of the rear center pin 6 be arranged in a tapered hole at the end position of the central shaft 32 of the rotor 3 in a sliding fit manner. This design enables no relative movement between the ball head of the rear center pin 6 and the workpiece, thereby being able to improve the machining accuracy and extend the service life of the fixture.

[0035] Referring to Figure 1 and Figure 2 , specifically, a number of groups of mounting screw holes 21 with the same size are formed on the mounting disk 2, and a number of mounting screw holes 21 in the same group are equidistantly distributed along the circumference of the mounting disk 2, so as to enable the claw poles 31 on the rotor 3 to be balanced in force when being clamped by the fixture. The mounting screw holes 21 in adjacent two groups are gradually and equidistantly reduced in the distance between the radius direction of the mounting disk 2 and the axis of the mounting disk 2, so as to adjust the positions of the number of rotating shafts 4 on the mounting disk 2 according to different types of rotors 3, avoiding uneven force distribution caused by some areas on the rotor 3 not being supported during the machining process, and then increasing the machining error.

[0036] It should be noted that the number of mounting screw holes 21 in the same group is an even number, and the two opposite mounting screw holes 21 are symmetrically distributed, so as to match more rotor 3 models and at the same time facilitate the force balance of the rotor 3.

[0037] Referring to Figure 1 and Figure 2 , further, the number of rotating shafts 4 are all composed of a fixed shaft 41 and a moving shaft 42 sleeved with each other. Among them, external threads are provided at both ends of the fixed shaft 41, and one end of the fixed shaft 41 is threadedly connected to the mounting disk 2. The moving shaft 42 is of a cylindrical structure. One end of it extends into the docking groove 311 to abut against the claw pole 31, and the other end is provided with an internal thread and is threadedly sleeved on the end of the fixed shaft 41 away from the mounting disk 2, so that the length of the rotating shaft 4 can be adjusted to better abut against the rotor 3, achieving complete positioning of the rotor 3.

[0038] It is worth mentioning that the fixed shaft 41 is an optional part, which has several specifications with different lengths to adapt to the clamping requirements of different types of rotors 3.

[0039] Referring to Figure 1 and Figure 2 , a plurality of mounting platforms 421 are axially formed on the movable shaft 42. There are at least two mounting platforms 421, and the plurality of mounting platforms 421 are symmetrically distributed in pairs, so that a wrench can clamp the movable shaft 42, and then the overall axial length of the rotating shaft 4 can be adjusted by rotation.

[0040] Referring to Figure 1 and Figure 2 , a plurality of connecting holes 22 are symmetrically formed on the mounting disc 2 for passing through screws 7 to connect the front center drill 1 and the mounting disc 2. The distance between the clamping portion 11 on the front center drill 1 and the mounting disc 2 is adjustable, so that the top head portion 12 can always be in tight contact with one end of the central shaft 32 on the rotor 3. At the same time, the detachable connection between the front center drill 1 and the mounting disc 2 is also convenient for timely replacement when parts are damaged.

[0041] It should be emphasized that the radius of the clamping portion 11 provided in this application should be less than the minimum distance between a plurality of mounting screw holes 21 and the axis of the mounting disc 2 to avoid the problem of interference between the rotating shaft 4 and the clamping portion 11 during the adjustment process.

[0042] The implementation principle of a turning fixture for a brushless generator rotor in an embodiment of this application is as follows:

[0043] First, the two ends of the central shaft 32 on the rotor 3 are respectively in tight contact with the top head portion 12 on the front center drill 1 and the rear center drill 6. Then, use a wrench to adjust the movable shaft 42 and the fixed shaft 41 of the rotating shaft 4 to ensure that a plurality of rotating shafts 4 are all in tight contact with the claw poles 31, so as to realize the complete limit of the rotor 3 and avoid the eccentric movement of the rotor 3 during the processing.

[0044] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A turning fixture for a brushless generator rotor, characterized in that: The invention comprises a front ejector pin (1) having one end connected to a chuck, a mounting plate (2) arranged on a side of the front ejector pin (1) away from the chuck, and a plurality of rotating shafts (4) arranged on the mounting plate (2) at equal intervals along the circumferential direction, wherein one end of the plurality of rotating shafts (4) away from the mounting plate (2) is commonly in contact with a rotor (3), the front ejector pin (1) comprises a clamping portion (11) and a ejector head portion (12) which are integrally connected and coaxial, the clamping portion (11) being engaged with the chuck, the rotor (3) comprising a claw pole (31) and a center shaft (32) which are integrally connected and coaxial, The ejector head (12) slides through the mounting plate (2) and abuts against one end of the central axis (32) on the rotor (3). A plurality of mounting screw holes (21) are formed through a side of the mounting plate (2) away from the front ejector pin (1). The plurality of rotating shafts (4) correspond to each other and are threadedly inserted into the plurality of mounting screw holes (21). A fixing nut (5) is threadedly sleeved on the rotating shaft (4). One side of the fixing nut (5) abuts against the mounting plate (2). The end of the rotor (3) away from the mounting plate (2) abuts against a rear ejector pin (6).

2. The turning fixture for a brushless generator rotor according to claim 1, characterized in that: The mounting plate (2) is provided with a plurality of groups of mounting screw holes (21), a plurality of the mounting screw holes (21) in the same group are equidistant from the axis of the mounting plate (2), and the plurality of groups of mounting screw holes (21) are distributed at equal intervals along the radial direction of the mounting plate (2).

3. The turning fixture for a brushless generator rotor according to claim 2, characterized in that: The number of the mounting screw holes (21) in the same group is an even number, and the plurality of mounting screw holes (21) in the same group are distributed at equal intervals along the circumference of the mounting plate (2).

4. The turning fixture for a brushless generator rotor according to claim 1, characterized in that: A plurality of the rotating shafts (4) are provided with mounting platforms (421) for clamping with a wrench. Two mounting platforms (421) are located on the same rotating shaft (4), and the two mounting platforms (421) are symmetrically distributed along the axis of the rotating shaft (4).

5. The turning fixture for a brushless generator rotor according to claim 4, characterized in that: The rotating shaft (4) comprises a fixed shaft (41) and a movable shaft (42); the fixed shaft (41) is threadedly connected to the mounting plate (2); the movable shaft (42) is threadedly sleeved on an end of the fixed shaft (41) away from the mounting plate (2); two mounting platforms (421) are both provided on the movable shaft (42); a plurality of docking grooves (311) are circumferentially provided on a side of the claw pole (31) close to the mounting plate (2); and an end of the movable shaft (42) away from the fixed shaft (41) is slidably fitted in the docking groove (311).

6. The turning fixture for a brushless generator rotor according to claim 1, characterized in that: The mounting plate (2) is symmetrically provided with a plurality of connection holes (22), and a plurality of the connection holes (22) are penetrated by screws (7), and the ends of the plurality of screws (7) away from the mounting plate (2) are threadedly penetrated in the clamping portion (11).

7. A turning fixture for a brushless generator rotor according to claim 6, characterized in that: The radius of the clamping portion (11) is smaller than the minimum distance between the mounting screw hole (21) and the axis of the mounting plate (2).

8. The turning fixture for a brushless generator rotor according to claim 1, characterized in that: The rear ejector pin (6) is a flexible ejector pin.

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