A brushless motor

Abstract

The present application relates to the technical field of motor installation, and provides a brushless motor, comprising a motor body, a mounting bracket and a fastening assembly; one end of the motor body is provided with a power output shaft, and a clamping groove is formed in the power output shaft along its circumferential direction; the mounting bracket is detachably connected to one end of the motor body where the power output shaft is located; the fastening assembly includes a fastening sleeve and a fastening spring piece; the fastening sleeve is sleeved on the motor body and one end thereof abuts against the side of the mounting bracket away from the motor body; the fastening spring piece is elastically clamped in the clamping groove and abuts against the end of the fastening sleeve away from the mounting bracket. Based on this, the working stability of the brushless motor can be improved.

Description

Technical Field

[0001] The present application relates to the field of motor installation, and in particular, to a brushless motor. Background Art

[0002] A brushless motor refers to a motor that uses direct current but does not require commutation through a brush. It has the advantages of high efficiency, low energy consumption, low noise, long life, high reliability, servo control, stepless frequency modulation and speed regulation, etc., and is mostly used in high-level electric vehicles, hybrid electric vehicles, medical devices, power tools, industrial automation products, etc.

[0003] In the related art, a brushless motor includes a motor body and a mounting bracket. The mounting bracket is detachably connected to one end of the motor body and is fixedly connected to the product through the mounting bracket, so as to fix the motor body. Among them, the shape of the mounting bracket is adapted to the product to be installed. Since the mounting bracket is detachably connected to the motor body, different-shaped mounting brackets can be replaced according to actual needs to be applicable to different products, thereby improving the applicability of the brushless motor.

[0004] However, in actual applications, the mounting bracket and the motor body are prone to looseness, resulting in poor stability of the brushless motor during operation, so improvement is needed. Summary of the Invention

[0005] In order to improve the stability of the brushless motor during operation, the present application provides a brushless motor.

[0006] The brushless motor provided by the present application adopts the following technical solutions:

[0007] A brushless motor includes a motor body, a mounting bracket and a fastening assembly; a power output shaft is provided at one end of the motor body, and a clamping groove is formed in the circumferential direction of the power output shaft; the mounting bracket is detachably connected to one end of the motor body where the power output shaft is located; the fastening assembly includes a fastening sleeve and a fastening elastic sheet; the fastening sleeve is sleeved on the motor body and one end abuts against the side of the mounting bracket away from the motor body; the fastening elastic sheet is elastically clamped in the clamping groove and abuts against the end of the fastening sleeve away from the mounting bracket.

[0008] By adopting the above technical solutions, in actual applications, the fastening sleeve is sleeved on the motor body to protect the components in the motor body. One end of the fastening sleeve abuts against the side of the mounting bracket away from the motor body, and the fastening elastic sheet elastically clamped in the clamping groove abuts against the end of the fastening sleeve away from the mounting bracket, so that the mounting bracket is pressed between the motor body and the fastening sleeve. Even if the detachable connection between the mounting bracket and the motor body becomes loose, the stability of the mounting bracket can be ensured, thereby improving the stability of the brushless motor during operation.

[0009] Preferably, the fastening assembly further includes a fastening ring, which is located between the fastening sleeve and the fastening elastic piece, with one end rotatably connected to the fastening sleeve and the other end abutted against the fastening elastic piece.

[0010] By adopting the above technical solution, by arranging the fastening ring, the dry friction between the fastening elastic piece and the fastening sleeve can be effectively reduced, and the normal operation of the brushless motor can be ensured while ensuring the abutting effect on the mounting bracket.

[0011] Preferably, the fastening assembly further includes a bearing, which is sleeved on the power output shaft at the clamping groove, and the fastening elastic piece is elastically clamped to the bearing and limited in the clamping groove.

[0012] By adopting the above technical solution, by arranging the bearing, the fastening elastic piece and the power output shaft can rotate relative to each other, so that the fastening elastic piece can abut against the fastening sleeve more stably, and the friction force received by the rotation of the power output shaft can also be reduced.

[0013] Preferably, the fastening assembly further includes a limiting shaft and a limiting spring. The limiting shaft is slidably connected to the fastening elastic piece, and the limiting spring is arranged between the limiting shaft and the fastening elastic piece to drive the limiting shaft to block the opening of the fastening elastic piece, and the limiting shaft abuts against the bearing.

[0014] By adopting the above technical solution, by arranging the limiting shaft and the limiting spring to block the opening of the fastening elastic piece, and the limiting shaft abuts against the circumferential side of the bearing to prevent the fastening elastic piece from accidentally falling off the bearing, thereby improving the stability of the clamping of the fastening elastic piece and further ensuring the stability of the fastening of the mounting bracket.

[0015] Preferably, a positioning post is provided on one side of the mounting bracket close to the fastening sleeve, a positioning hole is formed in the fastening sleeve, and the positioning post is inserted into the positioning hole.

[0016] By adopting the above technical solution, by arranging the positioning post and the positioning hole, the positioning installation of the fastening sleeve and the mounting bracket can be realized, and the relative movement between the fastening sleeve and the mounting bracket can be restricted.

[0017] Preferably, the mounting bracket is provided with a mounting hole, a positioning spring is arranged between the mounting hole and the positioning post, the positioning spring is used to drive the positioning post to extend out of the positioning hole, and a rotating groove is formed in one end of the fastening sleeve close to the mounting bracket along its circumferential direction, and the rotating groove is communicated with the positioning hole.

[0018] By adopting the above technical solution, by setting the positioning spring and the rotating groove, the positioning spring drives the positioning post to extend out of the positioning hole, so that the positioning post is inserted into the positioning hole more stably. When the mounting bracket needs to be replaced, before removing the fastening elastic piece, press the positioning post and rotate the fastening sleeve, so that the positioning post moves along the rotating groove. After removing the fastening elastic piece, the positioning post jacks up the fastening sleeve under the drive of the positioning spring, so as to facilitate the separation of the fastening sleeve from the mounting bracket, thus facilitating the removal of the fastening sleeve.

[0019] Preferably, the groove depth of the rotating groove gradually decreases from the end close to the positioning hole to the other end.

[0020] By adopting the above technical solution, by setting the groove depth of the rotating groove gradually decreasing from the end close to the positioning hole to the other end, it is possible to rotate the positioning post into the rotating groove by pressing the positioning post a small distance, and when the positioning post moves to the end of the rotating groove far from the positioning hole, the force exerted by the positioning spring on the positioning post increases, making it easier for the fastening sleeve to separate from the mounting bracket.

[0021] Preferably, a limiting hole is provided at the end of the fastening sleeve far from the positioning hole.

[0022] By adopting the above technical solution, by setting the limiting hole, when the positioning post moves along the rotating groove to the limiting hole, the rotation of the positioning post can be limited, so that the positioning post can jack up the fastening sleeve more stably.

[0023] Preferably, the fastening assembly further includes a pull rope. One end of the pull rope is arranged at the end of the limiting shaft far from the fastening elastic piece, and the other end passes through the fastening sleeve. The end of the pull rope far from the limiting shaft is perpendicular to the limiting hole and passes through the limiting hole.

[0024] By adopting the above technical solution, by setting the pull rope, it is convenient to use the pull rope to pull the limiting shaft, thus facilitating the installation and removal of the fastening elastic piece. And when the positioning post moves from the rotating groove to the limiting hole, the positioning post moves along the limiting hole under the drive of the positioning spring, so that the positioning post squeezes the pull rope, causing the pull rope to pull the limiting shaft to automatically release the blocking of the limiting shaft on the fastening elastic piece, facilitating the removal of the fastening elastic piece.

[0025] Preferably, two limiting posts are provided at the end of the fastening sleeve close to the fastening elastic piece. The two limiting posts are arranged at intervals and abut against the opening of the fastening elastic piece, so that the fastening sleeve and the fastening elastic piece rotate synchronously.

[0026] By adopting the above technical solution, by setting two limiting posts, the positioning installation of the fastening elastic piece can be realized, and under the action of the two limiting posts, the fastening sleeve and the fastening elastic piece rotate synchronously to ensure the normal operation of the pull rope and make the operation of the fastening assembly stable.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. In practical applications, the fastening sleeve is sleeved on the motor body to protect the components in the motor body. One end of the fastening sleeve abuts against the side of the mounting bracket away from the motor body, and the fastening elastic piece clamped in the clamping groove elastically clamps and presses against the end of the fastening sleeve away from the mounting bracket, so that the mounting bracket is pressed between the motor body and the fastening sleeve. Even if the detachable connection between the mounting bracket and the motor body becomes loose, the stability of the mounting of the mounting bracket can be ensured, thereby improving the stability of the operation of the brushless motor;

[0029] 2. By providing a positioning spring and a rotating groove, the positioning spring drives the positioning post to extend out of the positioning hole, so that the positioning post is more stably inserted into the positioning hole. When the mounting bracket needs to be replaced, before removing the fastening elastic piece, press the positioning post and rotate the fastening sleeve so that the positioning post moves along the rotating groove. After removing the fastening elastic piece, the positioning post jacks up the fastening sleeve under the drive of the positioning spring, so as to facilitate the separation of the fastening sleeve from the mounting bracket, thereby facilitating the disassembly of the fastening sleeve;

[0030] 3. By providing a pull rope, it is convenient to use the pull rope to pull the limiting shaft, thereby facilitating the installation and disassembly of the fastening elastic piece. And when the positioning post moves from the rotating groove to the limiting hole, the positioning post moves along the limiting hole under the drive of the positioning spring, so that the positioning post squeezes the pull rope, causing the pull rope to pull the limiting shaft to automatically release the blockage of the limiting shaft on the fastening elastic piece, so as to facilitate the disassembly of the fastening elastic piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the brushless motor in Embodiment 1 of the present application;

[0032] Figure 2 is an exploded schematic diagram of the brushless motor in Embodiment 1 of the present application;

[0033] Figure 3 is a schematic diagram of the overall structure of the brushless motor in Embodiment 2 of the present application;

[0034] Figure 4 is a schematic diagram of a partial structure of the brushless motor in Embodiment 2 of the present application;

[0035] Figure 5 is a partial exploded schematic diagram of the brushless motor in Embodiment 2 of the present application;

[0036] Figure 6 is a schematic diagram of the overall structure of the fastening sleeve in Embodiment 2 of the present application;

[0037] Figure 7It is a partial structural schematic diagram of the fastening component in Embodiment 2 of the present application.

[0038] Reference numerals: 1, motor body; 11, power output shaft; 12, clamping groove; 2, mounting bracket; 21, positioning column; 22, mounting hole; 23, positioning spring; 3, fastening component; 31, fastening sleeve; 311, positioning hole; 312, rotating groove; 313, limiting hole; 314, limiting column; 32, fastening spring piece; 33, fastening ring; 34, bearing; 35, limiting shaft; 36, limiting spring; 37, pull rope. Detailed implementation manners

[0039] The following will further elaborate on the present application in conjunction with the attached Figure 1-7 drawings.

[0040] An embodiment of the present application discloses a brushless motor.

[0041] Embodiment 1:

[0042] Referring to Figure 1 and Figure 2 , the brushless motor includes a motor body 1, a mounting bracket 2, and a fastening component 3. A power output shaft 11 protrudes from the upper end of the motor body 1. A clamping groove 12 is formed along the circumferential direction of the power output shaft 11. The mounting bracket 2 is detachably connected to the upper end of the motor body 1. In this embodiment, the mounting bracket 2 is detachably connected to the motor body 1 by bolt connection. In other embodiments, it can also be realized by clamping, plugging, etc.

[0043] Among them, the fastening component 3 includes a fastening sleeve 31 and a fastening spring piece 32. The lower end of the fastening sleeve 31 coaxially penetrates through the motor body 1, and the power output shaft 11 is located in the fastening sleeve 31. The fastening sleeve 31 can protect the components in the motor body 1. The upper end of the fastening sleeve 31 abuts against the upper side of the mounting bracket 2. The fastening spring piece 32 has an opening in a "V" shape. The fastening spring piece 32 is elastically clamped in the clamping groove 12 and abuts against the upper end of the fastening sleeve 31.

[0044] In practical applications, after the mounting bracket 2 is installed on the motor body 1, first, the fastening sleeve 31 is coaxially penetrated through the motor body 1 so that the upper end of the fastening sleeve 31 abuts against the upper side of the mounting bracket 2. Then, the fastening spring piece 32 is clamped in the clamping groove 12 so that the fastening spring piece 32 abuts against the upper end of the fastening sleeve 31, so that the mounting bracket 2 is pressed between the motor body 1 and the fastening sleeve 31. Even if the detachable connection between the mounting bracket 2 and the motor body 1 becomes loose, the stability of the installation of the mounting bracket 2 can be ensured, thereby improving the working stability of the brushless motor.

[0045] In some embodiments, the fastening assembly 3 further includes a fastening ring 33, and the fastening ring 33 is located between the fastening sleeve 31 and the fastening spring sheet 32. Specifically, one end of the fastening ring 33 is rotatably connected to the fastening sleeve 31, and the other end is pressed against the fastening spring sheet 32. When the brushless motor is working, the fastening spring sheet 32 ​​rotates with the power output shaft 11, and the fastening ring 33 replaces the fastening spring sheet 32 ​​and presses against the fastening sleeve 31, which can effectively reduce the dry friction between the fastening spring sheet 32 ​​and the fastening sleeve 31, and ensure the normal operation of the brushless motor while ensuring the pressing effect on the mounting bracket 2.

[0046] The implementation principle of this embodiment is as follows: in actual application, after the mounting bracket 2 is installed on the motor body 1, the fastening sleeve 31 is first coaxially inserted into the motor body 1, so that the upper end of the fastening sleeve 31 abuts against the upper side of the mounting bracket 2, and then the fastening spring piece 32 is clamped in the clamping groove 12, so that the fastening spring piece 32 abuts against the upper end of the fastening sleeve 31, so that the mounting bracket 2 is pressed between the motor body 1 and the fastening sleeve 31, even if the detachable connection between the mounting bracket 2 and the motor body 1 is loosened, the stability of the installation of the mounting bracket 2 can be guaranteed, thereby improving the working stability of the brushless motor.

[0047] Embodiment 2:

[0048] Reference Figure 3 and Figure 4 , the other structures of this embodiment are the same as those of the embodiment 1, and the difference lies in the structure of the fastening assembly 3. Specifically, the fastening assembly 3 also includes a bearing 34, the inner ring of the bearing 34 is sleeved on the power output shaft 11 and located in the clamping groove 12, and at the same time, the fastening spring piece 32 is elastically clamped on the outer ring of the bearing 34, so that the fastening spring piece 32 and the power output shaft 11 can rotate relative to each other, and the fastening spring piece 32 is prevented from rotating when it is pressed against the fastening sleeve 31 as much as possible, so as to improve the stability of the fastening sleeve 31, thereby improving the stability of the installation of the mounting bracket 2, and at the same time, it can also reduce the friction force of the power output shaft 11 when rotating.

[0049] In some embodiments, the fastening assembly 3 also includes a limiting shaft 35 and a limiting spring 36. The limiting shaft 35 is slidably connected in the fastening spring sheet 32 ​​and one end is located at the opening of the fastening spring sheet 32. One end of the limiting spring 36 is fixedly connected to the outer side of the fastening spring sheet 32, and the other end is fixedly connected to the limiting shaft 35 to drive the limiting shaft 35 to slide so that the limiting shaft 35 blocks the opening of the fastening spring sheet 32, and the limiting shaft 35 abuts against the peripheral side of the bearing 34. In this way, the limiting shaft 35 needs to be pulled outward so that the limiting shaft 35 slides out of the opening of the fastening spring sheet 32, so that the fastening spring sheet 32 ​​can be separated from the bearing 34, and the fastening spring sheet 32 ​​can be prevented from accidentally falling off the bearing 34 as much as possible, thereby improving the stability of the fastening spring sheet 32, and then ensuring the stability of the fastening of the mounting bracket 2.

[0050] Reference Figure 4 In some embodiments, a positioning post 21 is provided on the upper side of the mounting bracket 2. Correspondingly, a positioning hole 311 is formed in the fastening sleeve 31. The positioning post 21 is inserted into the positioning hole 311 to achieve the positioning installation of the fastening sleeve 31 and the mounting bracket 2, and can limit the relative movement between the fastening sleeve 31 and the mounting bracket 2.

[0051] Reference Figure 5 , in some embodiments, a mounting hole 22 is formed in the mounting bracket 2. One end of the positioning post 21 is located in the mounting hole 22. A positioning spring 23 is provided between the mounting hole 22 and the positioning post 21. Specifically, one end of the positioning spring 23 is fixedly connected to the positioning post 21, and the other end is fixedly connected to the bottom wall of the mounting hole 22. The positioning spring 23 drives the positioning post 21 to extend out of the positioning hole 311, so that the positioning post 21 is more stably inserted into the positioning hole 311.

[0052] Reference Figure 6 , at the same time, a rotating groove 312 is formed on the lower side of the upper end of the fastening sleeve 31. The rotating groove 312 is arranged along the circumferential direction of the fastening sleeve 31 and one end is communicated with the positioning hole 311. When the mounting bracket 2 needs to be replaced, before removing the fastening spring piece 32, by pressing the positioning post 21 and rotating the fastening sleeve 31, the positioning post 21 moves along the rotating groove 312. After removing the fastening spring piece 32, the positioning post 21 jacks up the fastening sleeve 31 under the drive of the positioning spring 23, so as to facilitate the separation of the fastening sleeve 31 and the mounting bracket 2, and thus facilitate the disassembly of the fastening sleeve 31. It should be noted that the number of the positioning posts 21 and the positioning springs 23 is two to fully and stably jack up the fastening sleeve 31.

[0053] In some embodiments, the groove depth of the rotating groove 312 gradually decreases from the end close to the positioning hole 311 to the other end, so that the height difference between the positioning post 21 extending out of the positioning hole 311 and the rotating groove 312 is small, and the positioning post 21 can be rotated into the rotating groove 312 by pressing the positioning post 21 a small distance. Moreover, when the positioning post 21 moves to the end of the rotating groove 312 far from the positioning hole 311, the positioning spring 23 is continuously compressed, so as to increase the force applied to the positioning post 21, making it easier for the fastening sleeve 31 to be separated from the mounting bracket 2.

[0054] In some embodiments, a limiting hole 313 is formed at the end of the rotating groove 312 far from the positioning hole 311. When the positioning post 21 moves along the rotating groove 312 to the limiting hole 313, the rotation of the positioning post 21 can be limited, so that the positioning post 21 can more stably jack up the fastening sleeve 31.

[0055] Reference Figure 5 、 Figure 6 and Figure 7In some embodiments, the fastening assembly 3 further includes a pull rope 37, one end of which is fixedly connected to the end of the limit shaft 35 away from the fastening spring sheet 32, and the limit shaft 35 can be pulled so that the limit shaft 35 contacts and blocks the fastening spring sheet 32, thereby facilitating the installation and removal of the fastening spring sheet 32. The other end of the pull rope 37 is passed through the fastening sleeve 31 and the end is fixedly connected to the fastening sleeve 31, and the end of the pull rope 37 is perpendicular to the length direction of the limit hole 313 and is passed through the limit hole 313.

[0056] When the fastening spring piece 32 is clamped on the bearing 34, the limiting spring 36 drives the limiting shaft 35 to move so that the limiting shaft 35 blocks the opening of the fastening spring piece 32. At this time, the pull rope 37 is pulled to make the pull rope 37 in a taut state. When the mounting bracket 2 needs to be replaced, the positioning column 21 is pressed and the fastening sleeve 31 is rotated to make the positioning column 21 move along the rotating groove 312. When the positioning column 21 moves from the rotating groove 312 to the limiting hole 313, the positioning column 21 moves along the limiting hole 313 driven by the positioning spring 23, so that the positioning column 21 squeezes the pull rope 37 passing through the positioning hole 311, so that the pull rope 37 pulls the limiting shaft 35 to automatically release the blocking of the fastening spring piece 32 by the limiting shaft 35, so as to facilitate the disassembly of the fastening spring piece 32. It should be noted that, under the action of the pull rope 37 , the fastening spring piece 32 is connected to the fastening sleeve 31 , which can minimize the occurrence of the fastening spring piece 32 being lost.

[0057] Reference Figure 5 In some embodiments, two circular limiting posts 314 are protruded from the upper end of the fastening sleeve 31. The two limiting posts 314 are arranged at intervals and abut against the opening of the fastening spring piece 32, so as to realize the positioning and installation between the fastening spring piece 32 and the fastening sleeve 31, and at the same time limit the rotation of the fastening spring piece 32, so that the fastening sleeve 31 and the fastening spring piece 32 can rotate synchronously, avoid the entanglement of the pull rope 37 as much as possible, and keep it in a stable taut state to ensure the normal operation of the pull rope 37 and ensure the stable operation of the fastening component 3.

[0058] The implementation principle of this embodiment is as follows: when the fastening spring piece 32 is clamped on the bearing 34, the limiting spring 36 drives the limiting shaft 35 to move so that the limiting shaft 35 blocks the opening of the fastening spring piece 32. At this time, the pull rope 37 is pulled to make the pull rope 37 in a taut state. When the mounting bracket 2 needs to be replaced, the positioning column 21 is pressed and the fastening sleeve 31 is rotated so that the positioning column 21 moves along the rotating groove 312. When the positioning column 21 moves from the rotating groove 312 to the limiting hole 313, the positioning column 21 moves along the limiting hole 313 driven by the positioning spring 23, so that the positioning column 21 squeezes the pull rope 37 passing through the positioning hole 311, so that the pull rope 37 pulls the limiting shaft 35 to automatically release the blocking of the fastening spring piece 32 by the limiting shaft 35, so as to facilitate the disassembly of the fastening spring piece 32.

[0059] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A brushless motor, characterized in that: The invention comprises a motor body (1), a mounting bracket (2) and a fastening assembly (3); a power output shaft (11) is provided at one end of the motor body (1), and a clamping groove (12) is provided along its circumference; the mounting bracket (2) is detachably connected to the motor body (1) at one end of the power output shaft (11); the fastening assembly (3) comprises a fastening sleeve (31) and a fastening spring sheet (32); the fastening sleeve (31) is passed through the motor body (1) and one end of the fastening sleeve abuts against a side of the mounting bracket (2) away from the motor body (1); the fastening spring sheet (32) is elastically clamped in the clamping groove (12) and abuts against an end of the fastening sleeve (31) away from the mounting bracket (2); The fastening assembly (3) further comprises a bearing (34), wherein the bearing (34) is sleeved on the power output shaft (11) and located at the clamping groove (12), and the fastening spring sheet (32) is elastically clamped on the bearing (34) and is limitedly located in the clamping groove (12); The fastening assembly (3) further comprises a limiting shaft (35) and a limiting spring (36), wherein the limiting shaft (35) is slidably connected to the fastening spring sheet (32), and the limiting spring (36) is arranged between the limiting shaft (35) and the fastening spring sheet (32) to drive the limiting shaft (35) to block the opening of the fastening spring sheet (32), and the limiting shaft (35) abuts against the bearing (34); A positioning column (21) is provided on one side of the mounting bracket (2) close to the fastening sleeve (31); a positioning hole (311) is provided on the fastening sleeve (31), and the positioning column (21) is inserted into the positioning hole (311); The mounting bracket (2) is provided with a mounting hole (22), a positioning spring (23) is provided between the mounting hole (22) and the positioning column (21), the positioning spring (23) is used to drive the positioning column (21) to extend out of the positioning hole (311), and one end of the fastening sleeve (31) close to the mounting bracket (2) is provided with a rotation groove (312) along its circumference, and the rotation groove (312) is communicated with the positioning hole (311); The fastening sleeve (31) is provided with a limiting hole (313) at one end of the rotating groove (312) away from the positioning hole (311); the fastening assembly (3) also includes a pull rope (37), one end of the pull rope (37) is arranged at one end of the limiting shaft (35) away from the fastening spring plate (32), and the other end is passed through the fastening sleeve (31), and the end of the pull rope (37) away from the limiting shaft (35) is perpendicular to the limiting hole (313) and passed through the limiting hole (313).

2. A brushless motor according to claim 1, characterized in that: The depth of the rotating groove (312) gradually decreases from one end close to the positioning hole (311) toward the other end.

3. A brushless motor according to claim 1, characterized in that: Two limiting posts (314) are provided at one end of the fastening sleeve (31) close to the fastening spring sheet (32); the two limiting posts (314) are arranged at intervals and abut against the opening of the fastening spring sheet (32), so that the fastening sleeve (31) and the fastening spring sheet (32) rotate synchronously.

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