CN218703713U - Centrally-mounted motor with harmonic speed reducing mechanism - Google Patents
Centrally-mounted motor with harmonic speed reducing mechanism Download PDFInfo
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- CN218703713U CN218703713U CN202223094127.3U CN202223094127U CN218703713U CN 218703713 U CN218703713 U CN 218703713U CN 202223094127 U CN202223094127 U CN 202223094127U CN 218703713 U CN218703713 U CN 218703713U
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Abstract
The utility model discloses a middle motor with a harmonic speed reducing mechanism, which comprises a casing and a middle shaft which is rotatably arranged relative to the casing; a stator is fixedly arranged in the shell, and a torque acquisition device, a rotor, a harmonic speed reduction mechanism and an output chain wheel which are mutually staggered are sequentially arranged on the axial direction of the middle shaft; the output unit of the harmonic speed reducing mechanism is provided with a middle hole; the middle shaft is connected with an output chain wheel through a transmission sleeve, the transmission sleeve comprises a torque deformation sleeve and a rigid sleeve which are mutually connected, the rigid sleeve penetrates through the middle hole, and a first one-way clutch mechanism is arranged between the inner wall of the middle hole and the rigid sleeve. The utility model discloses in, first one-way clutch mechanism installs in output unit's mesopore, consequently, first one-way clutch mechanism need not additionally occupy the axial space, can effectively reduce the whole width of motor, can stably acquire torque data through wireless power supply and the signal transmission effect between first wireless transmission module and the second wireless transmission module in addition.
Description
Technical Field
The utility model relates to the technical field of electric machines, especially, relate to a put motor in with harmonic speed reduction mechanism.
Background
Electric power assisted vehicle is a common helping hand instrument, and electric power assisted vehicle's core device is put the motor in, puts the motor and can provide helping hand moment at the user in-process of riding for the user can ride more laborsavingly, especially can promote greatly when going uphill and ride experience.
The output rotating speed of the rotor is generally reduced by a planetary gear reduction mechanism in the existing middle-arranged motor and then output to the middle shaft, and the planetary gear reduction mechanism is generally large in size, so that the traditional middle-arranged motor can only be made into a rotor offset structure or a T-shaped layout structure, and the middle-arranged motor is large in size and heavy in weight.
In order to achieve light weight and miniaturization, in the prior art, patent CN112224327A discloses a middle driving device for an electric power assisted bicycle, which includes a motor, a harmonic reducer, a torque sensor, a clutch, a sealing cover, a flange plate and a middle shaft, wherein a motor shaft is connected with a cam shaft of the harmonic reducer, and a rigid wheel of the harmonic reducer outputs; the rigid wheel positioning seat is connected with the clutch, and the clutch is connected with the middle shaft to realize one-way transmission. This solution has the following drawbacks:
(1) The connection structure between the harmonic reducer and the torque sensor is large, extra axial space needs to be wasted, and the overall width of the middle motor is large;
(2) Adopt the magnetic elasticity torque sensor in this scheme, the magnetic elasticity torque sensor is rotatory along with the axis, and the power supply of magnetic elasticity torque sensor and signal spread are all comparatively difficult, often need with the help of electric slip ring, and stability and reliability are all lower.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the not enough that exists among the prior art, the utility model provides a compact structure, whole width is short, the middle motor that puts that has harmonic speed reduction mechanism of lightweight.
The technical scheme is as follows: in order to achieve the above purpose, the utility model discloses a middle motor with a harmonic speed reducing mechanism, which comprises a casing and a middle shaft which is rotatably installed relative to the casing; a stator is fixedly arranged in the shell, and a torque acquisition device, a rotor, a harmonic speed reduction mechanism and an output chain wheel which are mutually staggered are sequentially arranged in the axial direction of the middle shaft; the rotor establishes a transmission relation with the middle shaft through the harmonic speed reducing mechanism;
the output unit of the harmonic speed reduction mechanism has a center hole; the middle shaft is connected with the output chain wheel through a transmission sleeve, the transmission sleeve comprises a moment deformation sleeve and a rigid sleeve which are mutually connected, the moment deformation sleeve is connected with the middle shaft, and the rigid sleeve is connected with the output chain wheel; the rigid sleeve penetrates through the middle hole, a first one-way clutch mechanism is installed between the inner wall of the middle hole and the rigid sleeve, and two ends of the first one-way clutch mechanism do not exceed two ends of the harmonic speed reducing mechanism.
Further, the first one-way clutch mechanism comprises an outer ring connected with the output unit and a clutch unit arranged between the outer ring and the rigid sleeve, and the clutch unit is a rotor or a pawl or a wedge.
Further, the reduction ratio of the harmonic speed reduction mechanism is 30 or less.
Furthermore, the torque acquisition device comprises a strain gauge arranged on the torque deformation sleeve, a first wireless transmission module fixedly arranged relative to the machine shell and a second wireless transmission module rotating along with the torque deformation sleeve; the strain gauge is electrically connected with the second wireless transmission module;
the first wireless transmission module and the second wireless transmission module can wirelessly transmit power and signals.
Furthermore, the first wireless transmission module and the second wireless transmission module are respectively provided with a first substrate and a second substrate, the first substrate and the second substrate are arranged in parallel, and the opposite end surfaces of the first substrate and the second substrate are respectively provided with a first coil and a second coil; the first circuit module and the first coil are respectively arranged on two end faces of the first substrate; the second substrate is provided with a second circuit module, and the second circuit module and the second coil are respectively arranged on two end faces of the second substrate.
Further, the middle shaft is provided with a spline part, and the moment deformation sleeve is provided with an internal spline which is sleeved with the spline part; or a second one-way clutch mechanism is arranged between the middle shaft and the moment deformation sleeve;
the middle shaft is also provided with an external spline connected with the output chain wheel.
Furthermore, the number of the strain gauges is two, and the two strain gauges are symmetrically arranged on two sides of a central shaft of the moment deformation sleeve; the second wireless transmission module is provided with half-bridge units which are correspondingly connected with the two strain gauges one by one, and the two half-bridge units form a full bridge through a connecting circuit; the second substrate has a center hole, and the connection line extends along an edge of the center hole.
Furthermore, a pedaling frequency sensor is further mounted on the axial direction of the middle shaft.
Furthermore, the first substrate is fixed in the casing through a first support, and the second substrate is fixed on the moment deformation sleeve through a second support.
Furthermore, the distance between any point on the shell and the axis of the center shaft is not more than 45mm.
Has the advantages that: the utility model discloses an in put motor with harmonic speed reducing mechanism has following advantage:
(1) The first one-way clutch mechanism is arranged in the middle hole of the output unit, so that the first one-way clutch mechanism does not need to occupy an independent axial space, and the whole width of the middle motor can be effectively reduced;
(2) The first wireless transmission module with the coil is adopted to carry out wireless communication with the second wireless transmission module, the first wireless transmission module carries out wireless power supply on the second wireless transmission module through the magnetic induction principle before the coil, the second wireless transmission module obtains the signal of the strain gauge and sends the signal to the first wireless transmission module through the coil, so that the wireless power supply and the signal transmission are realized, the structure is simple, and the torque data can be stably obtained.
Drawings
Fig. 1 is a structural view of a center motor having a harmonic speed reduction mechanism of a first embodiment;
FIG. 2 is a structural view of a coil on a second substrate;
FIG. 3 is a schematic diagram of two half-bridge units and bridge-set circuit;
fig. 4 is a structural view of a center motor having a harmonic speed reduction mechanism of a second embodiment.
In the figure: 1-a machine shell; 2-the middle axis; 21-end splines; 22-a spline section; 3-a stator; 4-a rotor; 5-a harmonic speed reduction mechanism; 51-an output unit; 6-torque acquisition device; 61-strain gauge; 62-a first wireless transmission module; 621-a first substrate; 63-a second wireless transmission module; 631-a second substrate; 632-half bridge cells; 7-an output sprocket; 8-a first one-way clutch mechanism; 81-outer ring; 82-a clutch unit; 9-a transmission sleeve; 91-moment deformation sleeve; 92-moment deformation sleeve; 10-a circuit board; 20-a cadence sensor; 30-a first support; 40-a second scaffold; 50-needle bearing; 60-support bearings; 70-a first bearing; 80-second bearing.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example one
The middle motor with the harmonic speed reducing mechanism shown in fig. 1 comprises a casing 1 and a middle shaft 2 rotatably mounted relative to the casing 1, wherein both ends of the middle shaft 2 are provided with end splines 21 for connecting pedal cranks, and both ends of the middle shaft 2 are respectively mounted on the casing 1 through support bearings 60; a stator 3 is fixedly installed in the casing 1, and a torque acquisition device 6, a rotor 4, a harmonic speed reduction mechanism 5 and an output chain wheel 7 which are mutually staggered are sequentially installed in the axial direction of the middle shaft 2, wherein the rotor 4, the harmonic speed reduction mechanism 5 and the torque acquisition device 6 are all installed in the casing 1; the rotor 4 and the stator 3 are installed in a sleeved mode, and the rotor 4 is in transmission relation with the middle shaft 2 through the harmonic speed reducing mechanism 5;
the output unit 51 of the harmonic speed reducing mechanism 5 has a center hole; the middle shaft 2 is connected with the output chain wheel 7 through a transmission sleeve 9; the transmission sleeve 9 comprises a moment deformation sleeve 91 and a rigid sleeve 92 which are connected with each other, the moment deformation sleeve 91 is connected with the middle shaft 2, and the rigid sleeve 92 is connected with the output chain wheel 7; the rigid sleeve 92 penetrates through the middle hole, a first one-way clutch mechanism 8 is installed between the inner wall of the middle hole and the rigid sleeve 92, and two ends of the first one-way clutch mechanism 8 do not exceed two ends of the harmonic speed reducing mechanism 5. The first one-way clutch mechanism 8 includes an outer ring 81 connected to the output unit 51 and a clutch unit 82 disposed between the outer ring 81 and the rigid sleeve 92, wherein the clutch unit 82 enables the rigid sleeve 92 to rotate together with the outer ring 81 when the outer ring 81 tends to rotate in a first direction relative to the rigid sleeve 92, and the outer ring 81 can rotate in a second direction relative to the rigid sleeve 92, and the first direction is opposite to the second direction. The clutch unit 82 is a rotor or a pawl or a wedge, and the outer ring 81, the clutch unit 82 and the nesting part of the rigid sleeve 92 with the clutch unit 82 can be referred to the existing rotor type one-way clutch, pawl type one-way clutch or wedge type one-way clutch. The output unit 51 and the outer ring 81 may be integrally formed.
Preferably, needle bearings 50 are arranged between both ends of the rigid sleeve 92 and the middle shaft 2. The needle bearings 50 ensure that the central shaft 2 is concentric with the entire system. A first bearing 70 is arranged between one end of the moment deformation sleeve 91 far away from the rigid sleeve 92 and the machine shell 1, and a second bearing 80 is arranged between one end of the moment deformation sleeve 91 close to the rigid sleeve 92 and the middle shaft 2.
By adopting the structure, the first one-way clutch mechanism 8 is arranged in the middle hole of the output unit 51, so that the first one-way clutch mechanism 8 does not need to occupy a separate axial space, and the whole width of the middle motor can be effectively reduced. In addition, the volume of the harmonic speed reducing mechanism 5 is much smaller than that of a traditional planetary gear speed reducing mechanism under the same speed reducing ratio, so that the rotor 4, the harmonic speed reducing mechanism 5 and the torque acquisition device 6 can be distributed on the axial direction of the central shaft 2, the stator 3 and the rotor 4 do not need to be arranged in a biased mode or distributed in a T shape relative to the central shaft 2, the size of the middle motor is reduced, and the use experience is improved.
Preferably, the reduction ratio of the harmonic speed reduction mechanism 5 is 30 or less.
The torque acquisition device 6 comprises a strain gauge 61 arranged on the moment deformation sleeve 91, a first wireless transmission module 62 fixedly arranged relative to the machine shell 1 and a second wireless transmission module 63 rotating along with the moment deformation sleeve 91; the strain gauge 61 is electrically connected with the second wireless transmission module 63; the first wireless transmission module 62 and the second wireless transmission module 63 can wirelessly transmit power and signals therebetween.
By adopting the structure, as the driving force of the middle shaft 2 is transmitted to the output chain wheel 7 through the transmission sleeve 9, the resistance of the output chain wheel 7 enables the torque deformation sleeve 91 to generate torsional deformation, and further the strain gauge 61 to generate deformation, the signal which is generated by the strain gauge 61 and can respond to the torque information is transmitted to the second wireless transmission module 63, the second wireless transmission module 63 processes and modulates the signal and then transmits the signal to the first wireless transmission module 62, the first wireless transmission module 62 outputs the signal to the circuit board 10, the circuit board 10 controls the rotor 4 to operate according to the torque information, the rotor 4 transmits the power to the middle shaft 2 through the first one-way clutch mechanism 8 and the rigid sleeve 92 through the harmonic speed reducing mechanism 5, the circuit board 10 can adjust the operating power of the central motor according to the real-time torque information, so that the power-assisted torque is matched with the required torque, the power-assisted effect can be improved, and the effect of saving labor of a user can be achieved.
Preferably, the first wireless transmission module 62 and the second wireless transmission module 63 respectively have a first substrate 621 and a second substrate 631, the first substrate 621 and the second substrate 631 are disposed in parallel, the positions of the two substrates can be interchanged, and the opposing end surfaces of the two substrates are respectively provided with a first coil and a second coil, and the second coil is shown in fig. 2. In addition, the first substrate 621 is provided with a first circuit module electrically connected to the first coil, and the first circuit module and the first coil are respectively disposed on two end surfaces of the first substrate 621, so that signal interference between the first coil and the first circuit module is not generated; the second substrate 631 is mounted with a second circuit module electrically connected to the second coil, and the second circuit module and the second coil are disposed on two end surfaces of the second substrate 631, so that no signal interference is generated between the second coil and the second circuit module. The first circuit module comprises an electromagnetic excitation circuit and a signal demodulation circuit, and the second circuit module comprises a signal modulation module and a power receiving circuit. The first circuit module is connected with a power supply, the electromagnetic excitation circuit generates alternating current to enable the first coil to generate an alternating magnetic field, so that the second coil can generate electromagnetic induction to generate current, and the power receiving circuit rectifies the current and then supplies power to other elements in the second wireless transmission module 63. The principles and circuit structures of the power supply and the signal transceiving adopt the prior art, and are not described herein.
Preferably, the middle shaft 2 has a spline portion 22, and the moment deformation sleeve 91 has an internal spline which is sleeved with the spline portion 22, and also has an external spline which is connected with the output chain wheel 7. The internal splines on the torque distortion sleeve 91 are disposed at the end thereof remote from the rigid sleeve 92, and the output sprocket 7 is mounted on the rigid sleeve 92 at the end remote from the torque distortion sleeve 91. The moment deformation sleeve 91 and the rigid sleeve 92 are connected by splines, i.e. one of them has an inner spline and the other has an outer spline.
Preferably, the number of the strain gauges 61 is two, and the two strain gauges 61 are symmetrically arranged on two sides of the central axis of the moment deformation sleeve 91; as shown in fig. 3, the second wireless transmission module 63 has half-bridge units 632 connected to the two strain gauges 61 in a one-to-one correspondence manner, and the two half-bridge units 632 form a full bridge through connection lines. The second substrate 631 has a central hole, and the connection lines extend along an edge of the central hole.
Preferably, a pedal frequency sensor 20 is further mounted on the axial direction of the middle shaft 2.
Preferably, the first substrate 621 is fixed in the casing 1 by a first bracket 30, and the second substrate 631 is fixed on the moment deformation sleeve 91 by a second bracket 40.
Preferably, the distance between any point on the casing 1 and the axis of the middle shaft 2 is not more than 45mm.
Example two
As shown in fig. 4, the structure of the present embodiment is substantially the same as that of the middle-mounted motor in the first embodiment, and the only difference is that a second one-way clutch mechanism 70 is disposed between the middle portion of the middle shaft 2 and the torque deformation sleeve 91 in the present embodiment; the second one-way clutch mechanism 70 can drive the torque deformation sleeve 91 to rotate when the middle shaft 2 rotates in the forward direction, and can not drive the torque deformation sleeve 91 to rotate when the middle shaft 2 stops rotating or rotates reversely. The second one-way clutch mechanism 70 may be in the form of a roller type one-way clutch, a sprag type one-way clutch, or a ratchet type one-way clutch. The inner race of the second one-way clutch mechanism 70 may be integrally formed with the center shaft 2, and the outer race of the second one-way clutch mechanism 70 may be integrally formed with the moment deformation sleeve 91. The second one-way clutch mechanism 70 is disposed at an end of the torque deformable sleeve 91 remote from the rigid sleeve 92.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (10)
1. A middle motor with a harmonic speed reducing mechanism comprises a machine shell (1) and a middle shaft (2) which is rotatably arranged relative to the machine shell (1); a stator (3) is fixedly arranged in the casing (1), and a torque acquisition device (6), a rotor (4), a harmonic speed reduction mechanism (5) and an output chain wheel (7) which are mutually staggered are sequentially arranged in the axial direction of the middle shaft (2); the rotor (4) is in transmission relation with the middle shaft (2) through the harmonic speed reducing mechanism (5); the method is characterized in that:
an output unit (51) of the harmonic speed reduction mechanism (5) has a center hole; the middle shaft (2) is connected with the output chain wheel (7) through a transmission sleeve (9), the transmission sleeve (9) comprises a moment deformation sleeve (91) and a rigid sleeve (92) which are connected with each other, the moment deformation sleeve (91) is connected with the middle shaft (2), and the rigid sleeve (92) is connected with the output chain wheel (7); the rigid sleeve (92) penetrates through the middle hole, a first one-way clutch mechanism (8) is installed between the inner wall of the middle hole and the rigid sleeve (92), and two ends of the first one-way clutch mechanism (8) do not exceed two ends of the harmonic speed reducing mechanism (5).
2. The centrally-mounted motor with a harmonic speed reduction mechanism according to claim 1, characterized in that the first one-way clutch mechanism (8) includes an outer ring (81) connecting the output unit (51) and a clutch unit (82) interposed between the outer ring (81) and the rigid sleeve (92), the clutch unit (82) being a rotor or a pawl or a sprag.
3. The center-placed electric machine with a harmonic speed reduction mechanism according to claim 2, characterized in that the reduction ratio of the harmonic speed reduction mechanism (5) is 30 or less.
4. The centrally-mounted motor with a harmonic speed reducing mechanism according to claim 1, characterized in that the torque acquisition device (6) comprises a strain gauge (61) mounted on the torque deformation sleeve (91), a first wireless transmission module (62) fixedly mounted relative to the machine shell (1) and a second wireless transmission module (63) rotating along with the torque deformation sleeve (91); the strain gauge (61) is electrically connected with the second wireless transmission module (63);
the first wireless transmission module (62) and the second wireless transmission module (63) can wirelessly transmit power and signals therebetween.
5. The centrally-mounted motor with a harmonic speed reduction mechanism according to claim 4, wherein the first wireless transmission module (62) and the second wireless transmission module (63) respectively have a first substrate (621) and a second substrate (631), the first substrate (621) and the second substrate (631) are arranged in parallel, and the opposite end surfaces of the first substrate (621) and the second substrate (631) are respectively provided with a first coil and a second coil; the first circuit module and the first coil are respectively arranged on two end faces of the first substrate (621); the second substrate (631) is provided with a second circuit module, and the second circuit module and the second coil are respectively arranged on two end surfaces of the second substrate (631).
6. The center motor with a harmonic speed reduction mechanism according to claim 4, characterized in that the middle shaft (2) has a spline portion (22), and the torque deformation sleeve (91) has an internal spline that is in sleeve engagement with the spline portion (22); or a second one-way clutch mechanism (70) is arranged between the middle shaft (2) and the moment deformation sleeve (91);
the middle shaft (2) is also provided with an external spline connected with the output chain wheel (7).
7. The centrally-mounted motor with a harmonic speed reducing mechanism according to claim 5, wherein the number of the strain gauges (61) is two, and the two strain gauges (61) are symmetrically arranged on two sides of the central axis of the moment deformation sleeve (91); the second wireless transmission module (63) is provided with half-bridge units (632) which are connected with the two strain gauges (61) in a one-to-one correspondence mode, and the two half-bridge units (632) form a full bridge through a connecting line; the second substrate (631) has a central hole, and the connection lines extend along an edge of the central hole.
8. The centrally-mounted motor with a harmonic speed reducing mechanism according to claim 1, characterized in that a pedal frequency sensor (20) is further mounted on the axial direction of the middle shaft (2).
9. The centrally-mounted motor with a harmonic speed reduction mechanism according to claim 5, characterized in that the first base plate (621) is fixed in the housing (1) by a first bracket (30), and the second base plate (631) is fixed on the moment deformation sleeve (91) by a second bracket (40).
10. The centrally-mounted motor with the harmonic speed reducing mechanism according to claim 1, characterized in that the distance between any point on the casing (1) and the axis of the center shaft (2) is not more than 45mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223094127.3U CN218703713U (en) | 2022-11-21 | 2022-11-21 | Centrally-mounted motor with harmonic speed reducing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223094127.3U CN218703713U (en) | 2022-11-21 | 2022-11-21 | Centrally-mounted motor with harmonic speed reducing mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218703713U true CN218703713U (en) | 2023-03-24 |
Family
ID=85622794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223094127.3U Active CN218703713U (en) | 2022-11-21 | 2022-11-21 | Centrally-mounted motor with harmonic speed reducing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218703713U (en) |
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2022
- 2022-11-21 CN CN202223094127.3U patent/CN218703713U/en active Active
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