Driving motor for wheelchair

Abstract

The invention relates to the technical field of motors, in particular to a driving motor for a wheelchair. The driving motor comprises a shell, a front end cover and a rear end cover which are arranged at the two axial ends of the shell respectively, and a rotating shaft rotationally supported between the front end cover and the rear end cover, a center hole is formed in the shell corresponding to the changed end of the front end cover, and a first bearing is arranged in the center hole in a matched mode; a planet carrier is arranged in the front end cover and comprises a supporting part, a transmission part and a connecting part which are sequentially arranged in the axial direction of the rotating shaft, the supporting part is of a hollow cylindrical structure, the outer wall of the supporting part is matched with an inner ring of the first bearing, a second bearing is arranged in the supporting part in a matched mode, and the transmission part is connected with the second bearing in a matched mode. And the power output end of the rotating shaft is matched with the inner ring of the second shaft bearing and extends into the planet carrier. The driving system has the advantage that the reliability and durability of the whole driving system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a drive motor for a wheelchair. Background Art

[0002] Chinese Patent Application No. 201610623905.3 discloses a double-gear reduction device, including a housing, a first-stage internal gear ring, a planetary disk, a double gear, a second-stage internal gear ring, and a connecting gear; the first-stage internal gear ring is fixed to the housing, an end cover is provided at the end of the housing, the planetary disk is installed on the output shaft of the hydraulic motor through a bearing, the double gear is installed on the planetary disk, the double gear includes a large-diameter gear and a small-diameter gear, the connecting gear is fixed to the outer shell of the hydraulic motor, the second-stage internal gear ring is sleeved on the connecting gear and meshes with the connecting gear; the large-diameter gear of the double gear meshes with the driving tooth on the output shaft of the hydraulic motor and the first-stage internal gear ring.

[0003] In the above technical solution, the double gear is used as a planetary gear and the power is transmitted to the planetary carrier through the large-diameter gear in the double gear, so that it is used as a power output end for transmission. However, in the above technical solution, the overall axial length of the motor is limited by the entities of the gears, bearings, and oil seals arranged along the axial direction, resulting in a relatively large overall structural volume of the device and occupying a large amount of space for actual assembly. Summary of the Invention

[0004] The purpose of the present invention is to provide a drive motor for a wheelchair that can shorten the overall axial length of the motor.

[0005] To achieve the above purpose, the present invention discloses a drive motor for a wheelchair, including a housing, a front end cover and a rear end cover respectively arranged at both axial ends of the housing, and a rotating shaft rotatably supported between the front end cover and the rear end cover. A central hole is formed in the housing corresponding to the front end cover, a first bearing is fitted in the central hole, a planetary carrier is provided in the front end cover. The planetary carrier includes a support portion, a transmission portion, and a connection portion arranged in sequence along the axial direction of the rotating shaft. The support portion is in a hollow cylindrical structure, the outer wall of the support portion is fitted with the inner ring of the first bearing, a second bearing is fitted in the support portion, the power output end of the rotating shaft is fitted with the inner ring of the second shaft bearing and extends into the planetary carrier. A double gear serving as a planetary gear is rotatably connected in the transmission portion, a gear ring is fixedly provided in the front end cover, the double gear meshes with both the gear ring and the power output end of the rotating shaft at the same time, and the connection portion is used to connect with the hub of the wheelchair wheel.

[0006] When the rotating shaft rotates, the front end of the rotating shaft drives the double gear to rotate by meshing with the double gear. When the double gear rotates on its own, it meshes with the gear ring, thereby realizing revolution. The revolution of the double gear drives the planet carrier to rotate. During this process, the first bearing and the second bearing support the supporting part of the planet carrier. The connecting part of the planet carrier is connected to the hub of the wheelchair wheel, thereby realizing the output of power.

[0007] In the present invention, by designing the first bearing and the second bearing for supporting the supporting part of the planet carrier in the same plane, the first bearing and the second bearing are arranged along the radial direction of the rotating shaft and are used in cooperation with the double gear, avoiding the waste of axial space, significantly shortening the axial length of the motor, optimizing the power transmission path, reducing energy loss, and having the advantages of improving the reliability and durability of the entire drive system.

[0008] Among them, the rotation mode of the rotating shaft in the drive motor is the same as that of the motor rotating shaft in the prior art.

[0009] Preferably, the housing includes a cylindrical part and a bottom located at one end of the cylindrical part. An annular recess is provided at the central position of the bottom, and the central hole is surrounded by the annular recess. The outer ring of the first bearing is fitted with the inner wall of the annular recess.

[0010] Preferably, an annular protrusion is formed at the inner end of the annular recess, and an oil seal is provided between the inner wall of the annular protrusion and the rotating shaft.

[0011] The oil seal is arranged on the side of the rotating shaft away from the planet carrier, saving the internal space of the planet carrier, enabling the supporting part of the planet carrier to be as close as possible to the housing, and shortening the axial length of the motor.

[0012] Preferably, the double gear includes a large-diameter gear part and a small-diameter gear part. A radial opening is provided in the transmission part, and the number of radial openings corresponds to the number of double gears. The radial opening is used for the small-diameter gear part to mesh with the gear ring, and the large-diameter gear part is fixedly sleeved on the outside of the teeth of the small-diameter gear part.

[0013] Compared with the method of arranging the double gear at one axial end of the planet carrier, it can avoid the waste of axial space, enable the planet carrier to have a hollow structure relative to a solid planet carrier, reduce the weight of the planet carrier; use the teeth of the small-diameter gear part as the spline for coaxial transmission, thereby realizing the spline connection with the large-diameter gear part.

[0014] Preferably, a weight-reducing groove is provided in the connecting part, and connecting seats are arranged in an array on the groove wall of the weight-reducing groove.

[0015] The planet carrier is connected to the hub of the wheelchair wheel through a connecting seat, which ensures the stability of the connection of the wheelchair wheel and further reduces the overall weight of the planet carrier by using a weight-reducing groove.

[0016] Preferably, a third bearing is provided between the outer circumferential surface of the connecting portion and the front end cover, and the connecting portion of the planet carrier is supported by the third bearing. The cooperation between the third bearing and the first bearing ensures the stability of the planet carrier during the rotation relative to the front end cover.

[0017] Preferably, the diameter of the transmission portion is greater than the diameter of the connecting portion, and the diameter of the connecting portion is greater than the diameter of the supporting portion. The third bearing is provided at the boundary between the connecting portion and the transmission portion, and the third bearing is used to axially limit the transmission portion to prevent the planet carrier from axially moving.

[0018] Preferably, an avoidance space is provided at one end of the transmission portion close to the supporting portion. The avoidance space is a stepped structure in which the supporting portion shrinks from the side away from the axis to the side close to the axis. A chamfer is provided at one end of the stepped structure away from the axis of the supporting portion, thereby preventing wear between the axial end of the transmission portion and the outer ring of the first bearing and affecting the service life of the planet carrier.

[0019] Preferably, the housing, the front end cover, and the rear end cover are all made of thin-walled magnesium alloy material, thereby reducing the overall weight of the motor.

[0020] Preferably, a fourth bearing is provided between the rotating shaft located in the housing and the housing. The fourth bearing is used to support the part close to the rear end of the rotating shaft, thereby ensuring the stability of the rotating shaft during rotation.

[0021] The present invention can significantly shorten the axial length of the motor, optimize the power transmission path, reduce energy loss, and has the advantages of improving the reliability and durability of the entire drive system. Brief Description of the Drawings

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the present invention.

[0023] Figure 2 It is a partial cross-sectional structure diagram of the front end cover in the present invention.

[0024] Figure 3 It is a three-dimensional cross-sectional structure diagram of the present invention.

[0025] In the figure: 11, housing; 12, front end cover; 13, rear end cover; 14, rotating shaft; 15, electromagnetic clutch brake; 16, planetary carrier; 160, supporting part; 161, transmission part; 162, connecting part; 163, weight reduction groove; 164, connecting seat; 165, avoidance space; 17, first bearing; 18, second bearing; 19, oil seal; 20, double gear; 201, large diameter gear part; 202, small diameter gear part; 21, gear ring; 22, third bearing; 23, fourth bearing. DETAILED DESCRIPTION

[0026] The present invention will be further described below based on the accompanying drawings and specific embodiments.

[0027] Depend on Figure 1 As shown, the present embodiment discloses a driving motor for a wheelchair, comprising a housing 11, a front end cover 12 and a rear end cover 13 arranged on the housing 11, the housing 11, the front end cover 12 and the rear end cover 13 are all made of thin-walled magnesium alloy, a rotating shaft 14 is passed through the axial position of the housing 11, a fourth bearing 23 is arranged between the rotating shaft 14 located in the housing 11 and the housing 11, the fourth bearing 23 is used to support the part close to the rear end of the rotating shaft 14, an oil seal 19 sleeved on the rotating shaft 14 is arranged in the housing 11, an electromagnetic clutch brake 15 is arranged in the rear end cover 13, and the axial rear end of the rotating shaft 14 is dynamically connected to the electromagnetic clutch brake 15; a planet carrier 16 is arranged in the front end cover 12, and the planet carrier 16 includes a supporting portion 160, a transmission portion 161 and a connecting portion 162 arranged in sequence along the axial direction of the rotating shaft 14, Figure 2 As shown, the support portion 160 is a hollow cylindrical structure, a first bearing 17 is provided between the support portion 160 and the housing 11, the outer wall of the support portion 160 cooperates with the inner ring of the first bearing 17, a second bearing 18 is provided between the support portion 160 and the axial front end of the rotating shaft 14, the inner wall of the support portion 160 cooperates with the outer ring of the second bearing 18, the power output end of the rotating shaft 14 cooperates with the inner ring of the second shaft bearing 18 and extends into the transmission portion 161 of the planetary carrier 16, the first bearing 17 and the second bearing 18 are arranged along the radial direction of the rotating shaft 14, a double gear 20 is rotatably connected in the transmission portion 161, a gear ring 21 is fixedly provided in the front end cover 12, and the double gear 20 is meshed with the gear ring 21 and the axial front end of the rotating shaft 14 at the same time.

[0028] Depend on Figure 3 As shown, a weight-reducing groove 163 is provided in the connecting portion 162, and connecting seats 164 are arranged in an array on the groove wall of the weight-reducing groove 163. A third bearing 22 is provided between the outer cylindrical surface of the connecting portion 162 and the front end cover 12. The diameter of the transmission portion 161 is larger than the diameter of the connecting portion 162, and the diameter of the connecting portion 162 is larger than the diameter of the supporting portion 160. The third bearing 22 is provided at the boundary between the connecting portion 162 and the transmission portion 161. The connecting portion 162 is provided on the side away from the brake mechanism and is used to be connected to the wheel hub of the wheelchair wheel.

[0029] The double - gear 20 includes a large - diameter gear portion 201 and a small - diameter gear portion 202. The large - diameter gear portion 201 is fixedly sleeved on the outer side of the teeth of the small - diameter gear portion 202. The transmission part 161 is provided with a radial opening, and the number of radial openings corresponds to the number of double - gears 20. The radial opening is used to make the small - diameter gear portion 202 mesh with the ring gear 21.

[0030] One end of the transmission part 161 close to the support part 160 is provided with an avoidance space 165. The avoidance space 165 is located between the outer ring of the first bearing 17 and the transmission part 161, thereby preventing wear between the axial end of the transmission part 161 and the outer ring of the first bearing 17, which affects the service life of the planet carrier 16. One end of the transmission part 161 close to the support part 160 is provided with a chamfer.

[0031] When the rotating shaft 14 rotates, the front axial end of the rotating shaft 14 drives the large - diameter gear portion 201 of the double - gear 20 to rotate. At this time, since the diameter of the front axial end of the rotating shaft 14 is smaller than that of the large - diameter gear portion 201, the speed - reducing transmission of the rotating shaft 14 to the large - diameter gear portion 201 is realized. At the same time, since the teeth of the small - diameter gear portion 202 are used as splines for linkage, the large - diameter gear portion 201 drives the small - diameter gear portion 202 to rotate synchronously through the teeth of the small - diameter gear portion 202. At this time, since the small - diameter gear portion 202 meshes with the ring gear 21, the double - gear 20 rotates and revolves at the same time, driving the planet carrier 16 to revolve. The planet carrier 16 drives the hub of the wheelchair wheel to rotate through the connecting part 162, thereby driving the wheelchair wheel to rotate; when the wheelchair wheel does not need to rotate, the electromagnetic clutch brake 15 is started, and the electromagnetic clutch brake 15 applies a resistance to the rotation of the rotating shaft 14 through electromagnetic induction, so that it stops.

Claims

1. A drive motor for a wheelchair, comprising a housing, a front cover and a rear cover respectively arranged at two axial ends of the housing, and a rotating shaft rotatably supported between the front cover and the rear cover, characterized in that: A center hole is formed on one end of the shell corresponding to the front end cover, and a first bearing is fitted in the center hole. A planet carrier is provided in the front end cover, and the planet carrier includes a supporting part, a transmission part and a connecting part which are arranged in sequence along the axial direction of the rotating shaft. The supporting part is a hollow cylindrical structure, and the outer wall of the supporting part is fitted with the inner ring of the first bearing. A second bearing is fitted in the supporting part. The power output end of the rotating shaft is fitted with the inner ring of the second shaft bearing and extends into the planet carrier. A double gear serving as a planetary gear is rotatably connected in the transmission part. A gear ring is fixedly provided in the front end cover, and the double gear is meshed with the gear ring and the power output end of the rotating shaft at the same time. The connecting part is used to connect with the wheel hub of the wheelchair wheel.

2. A wheelchair drive motor according to claim 1, characterized in that: The shell includes a cylindrical portion and a bottom located at one end of the cylindrical portion, an annular recess is provided at the center of the bottom, the center hole is surrounded by the annular recess, and the outer ring of the first bearing cooperates with the inner wall of the annular recess.

3. A wheelchair drive motor according to claim 2, characterized in that: An annular convex portion is formed at the inner end of the annular concave portion, and an oil seal is provided between the inner wall of the annular convex portion and the rotating shaft.

4. A wheelchair drive motor according to claim 1, 2 or 3, characterized in that: The duplex gears include a large diameter gear portion and a small diameter gear portion. The transmission portion is provided with radial openings, the number of which corresponds to the number of the duplex gears. The radial openings are used to enable the small diameter gear portion to mesh with the gear ring. The large diameter gear portion is fixedly sleeved on the outer side of the gear teeth of the small diameter gear portion.

5. The drive motor for a wheelchair according to claim 1, characterized in that: A weight-reducing groove is arranged in the connecting portion, and connecting seats are arranged in an array on the groove wall of the weight-reducing groove.

6. A wheelchair drive motor according to claim 1 or 5, characterized in that: A third bearing is provided between the outer circumferential surface of the connecting portion and the front end cover.

7. A wheelchair drive motor according to claim 6, characterized in that: The diameter of the transmission part is larger than the diameter of the connection part, the diameter of the connection part is larger than the diameter of the support part, and the third bearing is arranged at the boundary between the connection part and the transmission part.

8. A wheelchair drive motor according to claim 7, characterized in that: An escape space is provided at one end of the transmission part close to the support part. The escape space is a step structure of the support part that shrinks inward from the side away from the axis to the side of the axis. The step structure is chamfered at one end away from the axis of the support part.

9. The drive motor for a wheelchair according to claim 1, characterized in that: The shell, the front cover and the rear cover are all made of thin-walled magnesium alloy.

10. The drive motor for a wheelchair according to claim 1, characterized in that: A fourth bearing is provided between the rotating shaft located in the housing and the housing, and the fourth bearing is used to support a portion close to the rear end of the rotating shaft.

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