WO2019061558A1 - Worm drive mechanism for wheelchair - Google Patents

Abstract

Disclosed is a worm drive mechanism for a wheelchair, the worm drive mechanism comprising a driving motor (1), a driving spring (6), and a drive gear (7). An U-shaped adjustment ring (13) is driven to rotate by rotating an adjustment handle (15), and the U-shaped adjustment ring (13) drives a threaded adjustment wheel (14) to rotate, such that the threaded adjustment wheel (14) is moved along an axis of the threaded adjustment wheel (14), that is to say, the initial elastic performance of the driving spring (6) can be controlled by adjusting the adjustment handle (15), and in turn, the maximum torque that can be transmitted by the driving spring (6) is controlled. Upon the adjustment of the initial elastic performance of threads, the driving motor (1) is controlled to start to operate, the driving motor (1) drives a drive shaft (5) to rotate, the drive shaft (5) drives two spring fixing disks (8) to rotate, the two spring fixing disks (8) drive the driving spring (6) to rotate, the driving spring (6) rotates to drive the drive gear (7) to rotate, and the drive gear (7) then drives a gear shaft (11) to rotate, so that the wheelchair can be driven to operate by means of the rotation of the gear shaft (11). By means of the binding force of first adjustment teeth (16) and second adjustment teeth (23) on the driving spring (6) while the drive shaft (5) is rotating, the torque transmitted by the driving spring (6) can be adjusted.

Description

 Title of Invention: A Wheel Drive Mechanism for Wheelchairs

 Technical field

 [0001] The present invention belongs to the technical field of wheelchair driving, and in particular, to a worm gear mechanism for a wheelchair.

 Background technique

 [0002] Wheelchairs are used as walking tools for disabled people, usually driven by electricity. It is usually difficult to close, which brings a lot of trouble to disabled people.

 technical problem

 [0003] During the use of the wheelchair currently in use, it is difficult for people to turn off the motor because of the wrong operation of the snoring drive motor; and the arm may be sprained because of the subconscious movement; thus, the user is brought A lot of inconvenience; therefore, it is a very necessary solution to design a wheelchair transmission mechanism that can automatically turn off the motor drive because of the wrong operation.

 Technical solution

 In order to solve the above-mentioned drawbacks in the prior art, the present invention discloses a wheelchair worm gear mechanism which is realized by the following technical solutions.

 [0005] A worm gear mechanism for a wheelchair, comprising: a drive motor, a motor support, a ring support, a fixed plate, a drive shaft, a drive spring, a transmission gear, a spring fixed disc, an internal gear ring, and an arc Connecting plate, gear shaft, connecting disc, adjusting U-ring, adjusting thread wheel, adjusting handle, first adjusting tooth

, spring fixing plate, compression spring, weight, first centrifugal groove, tension spring, tooth connecting plate, second adjusting tooth, second centrifugal groove, second tooth groove, first tooth groove, connecting rod , wherein the driving motor is mounted on the fixing plate through the motor support; the driving shaft is connected with the output shaft of the driving motor; the outer circular surface of the driving shaft is evenly encirculated with a plurality of first tooth grooves in the axial direction; the first tooth groove The lower side has a first centrifugal groove, and each of the first tooth grooves communicates with the first centrifugal groove; the first centrifugal groove passes through the center of the transmission shaft; the outer circular surface of the transmission shaft is evenly distributed along the axial direction a plurality of second tooth slots; a second centrifugal groove is disposed on a lower side of the second tooth groove, and each of the second tooth grooves is in communication with the second centrifugal groove; the first tooth groove and the phase The adjacent second tooth slots are at an angle of ninety degrees; the structure of each of the first tooth slots is exactly the same; for any one of them, the spring fixing plate is installed in the first tooth groove near the axis of the drive shaft One end; the first adjusting tooth is mounted at one end of the first tooth groove away from the axis of the drive shaft; one end of the connecting rod is mounted on the first adjusting tooth; the other end of the connecting rod is located at the first centrifugation through the spring fixing plate a compression spring is installed between the spring fixing plate and the first adjusting tooth; the weight is installed at the lower end of the connecting rod, and the weight is located in the first centrifugal groove; the weight and the first adjusting tooth are respectively located in the driving shaft Symmetrical sides; each second tooth groove has the same structure; for any one of them, the second adjustment tooth is mounted at the end of the second tooth groove away from the axis of the drive shaft; At the lower end of the second adjusting tooth, and the tooth connecting plate is located in the second centrifugal groove; a plurality of tension springs are evenly mounted between the tooth connecting plate and the second centrifugal groove; a spring-fixing disc, and two spring-fixing discs are respectively located on two sides of the first adjusting tooth and the second adjusting tooth; the two ends of the driving spring are respectively mounted on the two spring fixing discs, and the driving spring Nested on the drive shaft; the drive springs respectively cooperate with the first adjustment tooth and the second adjustment tooth mounted on the drive shaft; the outer circumference of the adjustment thread wheel has an external thread; the inner circumference of the adjustment thread wheel The internal thread is arranged; the adjusting thread wheel is mounted on the transmission shaft, and the adjusting thread wheel is located between the two spring fixing discs; the internal thread on the adjusting thread wheel is matched with the driving spring; one end of the adjusting U-ring is mounted on the adjusting handle One end of the adjustment U-ring on which the adjustment handle is mounted is mounted on the transmission shaft; the other end of the adjustment u-ring is mounted on the end surface of the adjustment screw wheel away from the drive motor; the internal ring gear is mounted on the fixed plate by the ring gear support Upper, and the inner ring is nested and adjusted outside the threaded wheel; the inner ring is matched with the external thread on the adjusting threaded wheel; the inner ring is symmetrically mounted on one side of the end face away from the driving motor a curved connecting plate; the connecting disc is mounted on the transmission shaft, and the connecting disc is connected with the two curved connecting plates; one end of the gear shaft is mounted on a fixing plate near the side of the driving motor; the transmission gear is mounted on the gear shaft The other end; the drive gear meshes with the drive spring.

 As a further improvement of the present technology, the tooth pitch angle of the second adjusting tooth is larger than the tooth tilt angle of the first adjusting tooth.

 [0007] As a further improvement of the present technology, the above-described adjustment threaded wheel acts on the drive spring in a limited position.

 As a further improvement of the present technology, the relative position of the adjustment screw wheel and the drive spring can be controlled by adjusting the adjustment handle before use; thereby controlling the initial elastic performance of the drive spring.

[0009] As a further improvement of the present technology, in the initial state, the first adjustment tooth is in the compression spring and the weight Under the joint action, the height outside the transmission shaft is smaller than the gap between the transmission gear and the driving spring, the gap between the transmission gear and the outer circumference of the transmission shaft; in the initial state, the first adjustment tooth is under the joint action of the compression spring and the weight The height outside the drive shaft is smaller than the adjustment screw wheel and the drive spring engagement 吋, and the gap between the thread wheel and the outer circular surface of the drive shaft is adjusted.

 [0010] As a further improvement of the present technology, in the working state, the maximum height of the second adjusting tooth under the action of the tension spring and the centrifugal force is smaller than the transmission gear and the driving spring, and the transmission gear and the transmission The gap between the outer circular surfaces of the shaft; under the working condition, the maximum height of the second adjusting tooth under the tension spring and the centrifugal force is smaller than the adjusting screw wheel and the driving spring, and the adjusting screw wheel and the driving shaft The gap between the outer circular faces.

 [0011] Compared with the conventional wheelchair driving technology, the wheelchair designed by the invention can convert the high rotation speed of the driving motor working raft into a lower rotation speed through the worm transmission mechanism; thereby driving the wheelchair to work; the same can be achieved by the automatic adjustment Incorrect operation of the slamming drive motor can be turned off or adjusted.

[0012] In the present invention, the transmission shaft is connected to the output shaft of the driving motor; the outer circular surface of the transmission shaft is evenly encirculated with a plurality of first tooth grooves in the axial direction; the lower side of the first tooth groove is firstly centrifuged a groove, and each of the first tooth slots is in communication with the first centrifugal groove; the first centrifugal groove passes through the center of the transmission shaft; the outer circumferential surface of the transmission shaft is evenly encirculated with a plurality of second tooth grooves in the axial direction; The second tooth groove has a second centrifugal groove, and each of the second tooth grooves communicates with the second centrifugal groove; the first tooth groove is adjacent to the adjacent second tooth groove. Angle of installation; the structure of each of the first tooth slots is exactly the same; for any one of them, the spring fixing plate is installed at one end of the first tooth groove near the axis of the transmission shaft; the first adjustment tooth is installed at the first One end of the tooth groove away from the axis of the drive shaft; one end of the connecting rod is mounted on the first adjusting tooth; the other end of the connecting rod is located in the first centrifugal groove through the spring fixing plate; the spring fixing plate and the first adjusting tooth a compression spring is installed between them; the weight is mounted on the connecting rod a lower end, and the weight is located in the first centrifugal groove; the weight and the first adjustment tooth are respectively located on two sides of the transmission shaft symmetrical; the structure of each second tooth groove is completely the same; for any one of them, The second adjusting tooth is installed at one end of the second tooth groove away from the axis of the driving shaft; the tooth connecting plate is installed at the lower end of the second adjusting tooth, and the tooth connecting plate is located in the second centrifugal groove; the tooth connecting plate and A plurality of tension springs are evenly mounted between the second centrifugal grooves; a spring fixed disc is respectively mounted on both ends of the transmission shaft, and two spring fixed discs are respectively located Both sides of the first adjusting tooth and the second adjusting tooth; the two ends of the driving spring are respectively mounted on the two spring fixing discs, and the driving spring is nested on the driving shaft; the driving springs are respectively mounted on the driving shaft The first adjusting tooth and the second adjusting tooth are matched; the adjusting thread wheel has an external thread on the outer circular surface; the adjusting thread wheel has an internal thread on the inner circular surface; the adjusting thread wheel is mounted on the driving shaft, and the adjusting thread is adjusted The wheel is located between the two spring fixing discs; the internal thread on the adjusting thread wheel is matched with the driving spring; one end of the adjusting U-ring is mounted on the adjusting handle; the end of the adjusting U-ring on which the adjusting handle is mounted is mounted on the transmission shaft The other end of the adjusting u-ring is mounted on the end face of the adjusting screw wheel away from the driving motor side; the inner ring gear is mounted on the fixing plate by the ring gear support, and the inner ring gear is nested and adjusted outside the threaded wheel; The ring cooperates with the external thread on the adjusting thread wheel; two curved connecting plates are symmetrically mounted on one end surface of the inner ring gear away from the driving motor; the connecting disc is mounted on the transmission shaft, and is connected The disc is connected with two arc connecting plates; one end of the gear shaft is mounted on a fixing plate near one side of the driving motor; the transmission gear is mounted at the other end of the gear shaft; the transmission gear is meshed with the driving spring; the second adjusting tooth in the invention The tooth inclination angle of the tooth is larger than the tooth inclination angle of the first adjustment tooth. In the present invention, the adjustment of the threaded wheel pair drive spring is limited. In the present invention, the relative position of the adjustment threaded wheel and the drive spring can be controlled by adjusting the adjustment handle before use; thereby controlling the initial elastic performance of the drive spring. In the initial state, the height of the first adjusting tooth outside the driving shaft under the action of the compression spring and the weight is smaller than the gap between the transmission gear and the driving spring, and the gap between the transmission gear and the outer circular surface of the transmission shaft; The first adjusting tooth has a height outside the driving shaft under the action of the compression spring and the weight is smaller than the adjusting thread wheel and the driving spring engaging 吋, and adjusts the gap between the thread wheel and the outer circular surface of the transmission shaft. In the working state, the maximum height of the second adjusting tooth under the action of the tension spring and the centrifugal force is smaller than the gap between the transmission gear and the driving spring, and the gap between the transmission gear and the outer circular surface of the transmission shaft; In the state, the second adjusting tooth has a maximum height outside the driving shaft under the action of the tension spring and the centrifugal force is smaller than the adjusting thread wheel and the driving spring engaging 吋, and adjusts the gap between the thread wheel and the outer circular surface of the transmission shaft. The wheelchair designed by the present invention is rotated by adjusting the handle before use; adjusting the U-ring by adjusting the handle; adjusting the u-ring to adjust the rotation of the threaded wheel; since the drive motor is in a stop state; In the static state; the internal gear ring cooperates with the external thread on the adjusting thread wheel; therefore, when the adjusting screw wheel rotates, the adjusting thread wheel moves along the axis of the adjusting thread wheel, that is, the adjusting screw wheel and the driving can be controlled by adjusting the adjusting handle The relative position of the spring; thereby controlling the initial elastic properties of the drive spring. Enter And control the maximum torque that the drive spring can transmit; adjust the initial elastic performance of the thread 人们; control the drive motor to start working; drive the motor to drive the drive shaft to rotate; drive shaft drives the two spring fixed disc to rotate; two springs The fixed disc drives the driving spring to rotate; the driving spring rotates to drive the transmission gear to rotate; the transmission gear drives the gear shaft to rotate; the rotating shaft can transmit the rotating force to the tire of the wheelchair; and then the wheel is driven by the rotation of the tire; After the initial elastic performance of the drive spring of the drive gear is determined; the drive motor works; after the drive motor works, the speed at which the drive motor drives the drive shaft will gradually increase, because the weight is installed at the lower end of the connecting rod, and the weight is located at the a centrifugal groove; the weight and the first adjusting tooth are respectively located on two sides of the transmission shaft symmetrical; therefore, under the action of centrifugation, the weight will drive the connecting rod to move away from the side of the first adjusting tooth; The first adjustment tooth moves toward the inner side of the transmission shaft; and the second adjustment The tooth gradually moves to the outside of the transmission shaft under the action of the centrifugal force; the first adjustment tooth has a gradually decreasing binding force to the driving spring during the initial movement; and the second adjustment tooth has not yet been adjusted. Move out of the drive shaft; therefore, the torque transmitted by the drive spring will continue to decrease; when the first adjustment tooth is about to move completely to the inside of the drive shaft, the second adjustment tooth just moves out of the drive shaft; The adjustment tooth and the second adjustment tooth have the least binding force to the drive spring; that is, the torque transmitted by the drive spring is minimum; and when the first adjustment tooth moves completely to the inner side of the drive shaft, the second adjustment tooth moves out of the drive shaft The height of the second adjusting tooth is gradually increased to the driving spring; that is, the torque transmitted by the driving spring is also continuously increased; when the second adjusting tooth completely moves out of the driving shaft; The torque transmitted by the drive spring also reaches a maximum steady state; that is, the rotational speed of the transmission gear also reaches a steady state. People use wheelchairs, when people drive the motor to shut down because of wrong operation; the drive motor will work; the tire will turn; and the people will subconsciously grip the wheelchair tires; if the tires rotate torque If the shackle is large, it is possible to sprain the arm; therefore, in the present invention, by controlling the binding force of the first adjusting tooth and the second adjusting tooth to the driving spring; so that the person is gripping the tire 吋; the first adjusting tooth and the second Adjusting the minimum force of the tooth to the drive spring; that is, the torque transmitted by the drive spring is the smallest; that is, the torque of the wheelchair tire is the smallest; this is when the person grips the wheelchair tire; the tire stops rotating; and after the tire stops rotating The drive gear will squeeze the drive spring; the drive spring will be compressed; and when the spring is compressed to the limit 吋; the drive spring will drive the drive gear to rotate again; but in the process, the motor has been adjusted or the drive motor has been turned off; In the invention, the transmission gear can be delayed by controlling the elasticity of the drive spring. The bearing capacity is suddenly increased, and the driving spring drives the turning of the transmission gear again; the same can absorb the impact of a part of the transmission gear on the transmission shaft by the elasticity of the driving spring; that is, the transmission shaft is protected; and the driving motor is protected. In the present invention, the elastic performance of the drive spring is adjusted in an initial state. During the rotation of the adjustment thread wheel, the internal thread of the adjustment thread wheel is just rotated in mesh with the drive spring; therefore, the adjustment thread wheel does not move with the drive spring during the movement. Interference occurs; in the present invention, the tooth inclination angle of the second adjustment tooth is larger than the tooth inclination angle of the first adjustment tooth; that is, the second adjustment tooth moves to the outermost side of the transmission shaft, and the binding force to the drive spring is greater than The first adjusting tooth has a binding force to the driving spring in an initial state; that is, the torque of the driving spring initial driving transmission gear is smaller than the torque of driving the spring driving transmission gear after the transmission gear is stabilized. In the present invention, since the weight is mounted as a whole on the transmission shaft and mounted on the lower side of the connecting rod; therefore, when the weight moves, the weight will drive all the connecting rods to move together; that is, drive all the first adjusting teeth The teeth move together; therefore, the binding force of all the first adjustment teeth on the drive shaft to the drive spring is synchronously changed; that is, the drive spring transmits the torque 吋, and the portion of the drive spring that acts on the transmission gear passes through the transmission gear as a whole. The pressing force on the driving spring during the rotation; the driving spring is protected; in the present invention, since the tooth connecting plate is connected with all the first adjusting teeth on the transmission shaft; therefore, all the parts on the transmission shaft under centrifugal action The second adjusting tooth will move together; that is, the binding force of the second adjusting tooth on the driving shaft to the driving spring is synchronously changed; that is, the driving spring transmits the torque 吋, and the part of the driving spring that acts on the transmission gear passes through the whole to bear the transmission. The pressing force of the gear on the drive spring during the rotation; the drive spring is protected.

Advantageous effects of the invention

Beneficial effect

The wheelchair designed by the present invention is rotated by adjusting the handle before use; the U-ring is rotated by adjusting the handle; the U-ring is adjusted to adjust the rotation of the threaded wheel; since the drive motor is in a stop state; In the static state; the internal gear ring cooperates with the external thread on the adjusting thread wheel; therefore, when the adjusting screw wheel rotates, the adjusting thread wheel moves along the axis of the adjusting thread wheel, that is, the adjusting screw wheel and the driving can be controlled by adjusting the adjusting handle The relative position of the spring; thereby controlling the initial elastic properties of the drive spring. In turn, the maximum torque that can be transmitted by the drive spring is controlled; the initial elastic performance of the thread is adjusted; the control drive motor starts to work; the drive motor drives the drive shaft to rotate; the drive shaft drives the two spring fixed discs to rotate; The fixed disc drives the drive spring to rotate; The rotation of the spring drives the transmission gear to rotate; the transmission gear drives the gear shaft to rotate; the rotation force can be transmitted to the tire of the wheelchair through the gear shaft; and the wheelchair is driven by the rotation of the tire.

 Brief description of the drawing

 DRAWINGS

 [0014] FIG. 1 is a schematic view showing the mounting of an integral part.

 2 is a schematic view showing the internal structure of an integral part.

 [0016] FIG. 3 is a schematic view showing the internal structure of the integral component.

 4 is a schematic view showing the internal structure distribution of the entire component.

 [0018] FIG. 5 is a schematic cross-sectional view showing the internal structure of the entire component.

 6 is a schematic view showing the structure of an internal ring gear.

 [0020] FIG. 7 is a schematic view showing the structure of the adjusting screw wheel.

 [0021] FIG. 8 is a schematic view showing the installation of a transmission gear.

 [0022] FIG. 9 is a schematic view of the cooperation of the transmission gear and the drive spring.

 [0023] FIG. 10 is a schematic view of the mounting of the drive spring.

 [0024] FIG. 11 is a schematic view showing the installation of the first adjustment tooth.

 [0025] FIG. 12 is a schematic view of the second adjustment tooth installation.

 Figure 13 is a schematic view showing the distribution of the second centrifugal tank.

 [0027] FIG. 14 is a schematic view showing the distribution of the first centrifugal tank.

 15 is a schematic structural view of a transmission shaft.

 [0029] FIG. 16 is a schematic view showing the distribution of the first adjustment tooth.

 17 is a schematic view showing the structure of a first adjustment tooth.

 [0031] FIG. 18 is a schematic view showing the distribution of the second adjustment tooth.

 [0032] FIG. 19 is a schematic view showing the structure of a second adjustment tooth.

 [0033] FIG. 20 is a schematic view showing the working principle of the first adjustment tooth and the second adjustment tooth.

 21 is a schematic diagram showing changes in the rotational speed of a gear shaft.

[0035] In the figure, the label name: 1, the drive motor; 2, the motor support; 3, the ring support; 4, the fixed plate; 5, the drive shaft; 6, the drive spring; 7, the transmission gear; 8, the spring fixed disc 9, internal gear ring; 10, curved connecting plate; 11, gear shaft; 12, connecting disc; 13, adjusting U-ring; 14, adjusting thread wheel; Adjusting the handle; 16, the first adjusting tooth; 17, the spring fixing plate; 18, the compression spring; 19, the weight; 20, the first centrifugal groove; 21, the tension spring; 22, the tooth connecting plate; The second adjusting tooth; 24, the second centrifugal groove; 25, the second tooth groove; 26, the first tooth groove; 27, the connecting rod.

BEST MODE FOR CARRYING OUT THE INVENTION

BEST MODE FOR CARRYING OUT THE INVENTION

As shown in FIG. 1 and 2, it comprises a driving motor 1, a motor support 2, a ring gear support 3, a fixing plate 4, a transmission shaft 5, a driving spring 6, a transmission gear 7, a spring fixing disc 8, an internal gear ring 9, Curved connecting plate 10, gear shaft 11, connecting disc 12, adjusting U-ring 13, adjusting thread wheel 14, adjusting handle 15, first adjusting tooth 16, spring fixing plate 17, compression spring 18, weight 19, a first centrifugal groove 20, a tension spring 21, a tooth connecting plate 22, a second adjusting tooth 23, a second centrifugal groove 24, a second tooth groove 25, a first tooth groove 26, and a connecting rod 27, wherein As shown in Fig. 1, the drive motor 1 is mounted on the fixed plate 4 via the motor support 2; as shown in Fig. 3, the drive shaft 5 is coupled to the output shaft of the drive motor 1; as shown in Fig. 14, the outer circumference of the drive shaft 5 A plurality of first tooth grooves 26 are evenly distributed along the axial direction; a lower side of the first tooth groove 26 has a first centrifugal groove 20, and each of the first tooth grooves 26 communicates with the first centrifugal groove 20. The first centrifugal groove 20 passes through the center of the transmission shaft 5; as shown in Fig. 13, the outer circumferential surface of the transmission shaft 5 is along the axial direction The mantle has a plurality of second tooth grooves 25; the lower side of the second tooth groove 25 has a second centrifugal groove 24, and each of the second tooth grooves 25 communicates with the second centrifugal groove 24; It is shown that the first tooth groove 26 and the adjacent second tooth groove 25 form an angle of ninety degrees; the structure of each of the first tooth grooves 26 is exactly the same; for any one of them, as shown in FIG. 11 As shown, the spring retaining plate 17 is mounted in one end of the first tooth groove 26 near the axis of the drive shaft 5; the first adjusting tooth 16 is mounted at one end of the first tooth groove 26 away from the axis of the drive shaft 5; As shown, one end of the connecting rod 27 is mounted on the first adjusting tooth 16; the other end of the connecting rod 27 is located in the first centrifugal groove 20 through the spring fixing plate 17; the spring fixing plate 17 and the first adjusting tooth 16 A compression spring 18 is mounted therebetween; as shown in Fig. 16, the weight 19 is mounted at the lower end of the connecting rod 27, and the weight 19 is located in the first centrifugal groove 20; the weight 19 and the first adjusting tooth 16 are respectively located in the transmission The two sides of the shaft 5 are symmetrical to each other; as shown in FIG. 12, the structure installed in each of the second tooth grooves 25 is identical; In one embodiment, as shown in FIG. 19, the second adjusting tooth 23 is mounted at one end of the second tooth groove 25 away from the axis of the drive shaft 5; as shown in FIG. 18, the tooth connecting plate 22 is mounted on the second adjusting tooth. The lower end of the 23, and the tooth connecting plate 22 is located in the second centrifugal groove 24; a plurality of tension springs 21 are evenly mounted between the tooth connecting plate 22 and the second centrifugal groove 24; as shown in Fig. 4, the transmission A spring fixing disc 8 is respectively mounted on both ends of the shaft 5, and two spring fixing discs 8 are respectively located on two sides of the first adjusting tooth 16 and the second adjusting tooth 23; as shown in FIG. The two ends of the spring 6 are respectively mounted on the two spring fixing discs 8, as shown in Fig. 9, and the driving spring 6 is nested on the transmission shaft 5; the driving springs 6 are respectively adjusted with the first adjustment mounted on the transmission shaft 5 The tooth 16 and the second adjusting tooth 23 are matched; as shown in FIG. 7, the outer surface of the adjusting thread wheel 14 has an external thread; the inner circular surface of the adjusting thread wheel 14 has an internal thread; the adjusting thread wheel 14 is mounted on The transmission shaft 5 is disposed between the two spring fixing discs 8; the internal thread on the adjusting thread wheel 14 is engaged with the driving spring 6; one end of the adjusting U-ring 13 is mounted on the adjusting handle 15; One end of the U-ring 13 on which the adjustment handle 15 is mounted is mounted on the transmission shaft 5; the other end of the adjustment U-ring 13 is mounted on the end surface of the adjustment threaded wheel 14 away from the side of the drive motor 1; The ring gear 9 is mounted on the fixed plate 4 via the ring gear support 3, and the inner ring gear 9 is nested Adjusting the outer side of the threaded wheel 14; the inner ring gear 9 is engaged with the external thread on the adjusting threaded wheel 14; as shown in Fig. 5, two curved connecting plates are symmetrically mounted on the side end surface of the inner ring gear 9 away from the driving motor 1 10; the connecting disc 12 is mounted on the transmission shaft 5, and the connecting disc 12 is connected to the two curved connecting plates 10; as shown in Fig. 8, one end of the gear shaft 11 is mounted on the fixing plate near the side of the driving motor 1. 4; the transmission gear 7 is mounted on the other end of the gear shaft 11; as shown in Fig. 9, the transmission gear 7 is engaged with the drive spring 6.

 [0037] The tooth inclination angle of the second adjustment tooth 23 is larger than the tooth inclination angle of the first adjustment tooth 16.

 [0038] The adjustment thread wheel 14 acts on the drive spring 6 in a limited position.

 [0039] The relative position of the adjustment screw wheel 14 to the drive spring 6 can be controlled by adjusting the adjustment knob 15 before use; thereby controlling the initial elastic performance of the drive spring 6.

Embodiments of the invention

 [0040] In the initial state, the first adjusting tooth 16 is disposed outside the transmission shaft 5 under the cooperation of the compression spring 18 and the weight 19, and the transmission gear 7 and the transmission shaft are smaller than the transmission gear 7 and the driving spring 6 are engaged. 5 gap between the outer circular faces; in the initial state, the first adjusting tooth 16 is lower than the adjusting screw wheel 14 and the driving spring 6 by the cooperation of the compression spring 18 and the weight 19 at a height smaller than the adjusting screw wheel 14 and the driving spring 6 A gap between the threaded wheel 14 and the outer circular surface of the drive shaft 5.

[0041] In the above working state, the second adjusting tooth 23 has a maximum height outside the transmission shaft 5 under the combined action of the tension spring 21 and the centrifugal force, less than the meshing of the transmission gear 7 and the driving spring 6, the transmission gear 7 and the transmission shaft 5 The gap between the outer circular faces; in the working state, the maximum height of the second adjusting tooth 23 outside the transmission shaft 5 under the action of the tension spring 21 and the centrifugal force is smaller than the engagement between the adjusting screw wheel 14 and the driving spring 6, and the adjusting thread The gap between the wheel 14 and the outer circular surface of the drive shaft 5.

 [0042] In summary: the wheelchair designed by the present invention can convert the high speed of the working motor 1 to a lower speed through the worm transmission mechanism; thereby driving the wheelchair to work; the same can be operated by mistakes The snoring drive motor 1 can have enough turn-off or adjustment.

[0043] In the present invention, the transmission shaft 5 is coupled to the output shaft of the drive motor 1; the outer circular surface of the transmission shaft 5 is evenly encased with a plurality of first tooth grooves 26 in the axial direction; the lower side of the first tooth groove 26 The first centrifugal groove 20 is disposed, and each of the first tooth grooves 26 communicates with the first centrifugal groove 20; the first centrifugal groove 20 passes through the center of the transmission shaft 5; the outer circular surface of the transmission shaft 5 is along the axial direction There are a plurality of second tooth grooves 25 uniformly; the second tooth groove 25 has a second centrifugal groove 24 on the lower side thereof, and each of the second tooth grooves 25 communicates with the second centrifugal groove 24; The socket 26 is at an angle of ninety degrees with the adjacent second tooth groove 25; the structure of each of the first tooth grooves 26 is completely the same; for any one of them, the spring fixing plate 17 is installed at the first One end of the tooth groove 26 near the axis of the drive shaft 5; the first adjusting tooth 16 is mounted at one end of the first tooth groove 26 away from the axis of the drive shaft 5; one end of the connecting rod 27 is mounted on the first adjusting tooth 16 The other end of the connecting rod 27 is located in the first centrifugal groove 20 through the spring fixing plate 17; the spring fixing plate 17 and the first adjusting tooth 16 A compression spring 18 is mounted therebetween; a weight 19 is mounted at the lower end of the connecting rod 27, and the weight 19 is located in the first centrifugal groove 20; the weight 19 and the first adjusting tooth 16 are respectively located on opposite sides of the transmission shaft 5 The structure of each of the second tooth grooves 25 is identical; for any one of them, the second adjusting tooth 23 is mounted at one end of the second tooth groove 25 away from the axis of the drive shaft 5; At the lower end of the second adjusting tooth 23, and the tooth connecting plate 22 is located in the second centrifugal groove 24; a plurality of tension springs 21 are evenly mounted between the tooth connecting plate 22 and the second centrifugal groove 24; Two spring fixing discs ₈ are respectively mounted on the two ends, and two spring fixing discs ₈ are respectively located on two sides of the first adjusting tooth 16 and the second adjusting tooth 23; the two ends of the driving spring 6 are respectively installed in two The springs are fixed on the disc 8 and the drive springs 6 are nested on the drive shaft 5; the drive springs 6 are respectively engaged with the first adjustment teeth 16 and the second adjustment teeth 23 mounted on the transmission shaft 5; 14 has an external thread on the outer circumference; adjusts the inner circle of the threaded wheel 14 The internal thread is provided; the adjusting threaded wheel 14 is mounted on the transmission shaft 5, and the adjusting threaded wheel 14 is located between the two spring fixing discs 8; the internal thread on the adjusting threaded wheel 14 is engaged with the driving spring 6; One end of 13 is installed in a tone a handle 15; an end of the adjustment U-ring 13 on which the adjustment handle 15 is mounted is mounted on the transmission shaft 5; the other end of the adjustment U-ring 13 is mounted on an end surface of the adjustment threaded wheel 14 away from the drive motor 1; The ring 9 is mounted on the fixed plate 4 via the ring support 3, and the inner ring 9 is nested outside the adjusting threaded wheel 14; the inner ring 9 is mated with the external thread on the adjusting threaded wheel 14; the inner ring 9 is remote from the drive motor Two curved connecting plates 10 are symmetrically mounted on one end surface of one; the connecting disc 12 is mounted on the transmission shaft 5, and the connecting disc 12 is connected to the two curved connecting plates 10; one end of the gear shaft 11 is mounted On the fixed plate 4 on the side close to the drive motor 1; the drive gear 7 is mounted on the other end of the gear shaft 11; the drive gear 7 is meshed with the drive spring 6; in the present invention, the pitch angle of the second adjustment tooth 23 is larger than One adjusts the tooth inclination angle of the tooth 16. In the present invention, the adjustment screw wheel 14 acts on the drive spring 6 in a limited position. In the present invention, the relative position of the adjustment screw wheel 14 and the drive spring 6 can be controlled by adjusting the adjustment knob 15 before use; thereby controlling the initial elastic performance of the drive spring 6. In the initial state, the height of the first adjusting tooth 16 outside the transmission shaft 5 under the cooperation of the compression spring 18 and the weight 19 is smaller than the engagement of the transmission gear 7 and the driving spring 6, and the outer surface of the transmission gear 7 and the transmission shaft 5 The gap between the first adjusting teeth 16 in the initial state under the action of the compression spring 18 and the weight 19 is less than the engagement of the adjusting screw wheel 14 and the driving spring 6 , and the adjusting thread wheel 14 is The gap between the outer circular faces of the drive shaft 5. In the working state, the second adjusting tooth 23 has a maximum height outside the transmission shaft 5 under the combined action of the tension spring 21 and the centrifugal force, less than the meshing of the transmission gear 7 and the driving spring 6, and the outer surface of the transmission gear 7 and the transmission shaft 5 The gap between the second adjusting teeth 2 3 under the action of the tension spring 21 and the centrifugal force is smaller than the adjustment of the threaded wheel 14 and the driving spring 6 in the working state, and the adjusting thread wheel 14 and the gap between the outer circumference of the drive shaft 5. The wheelchair designed by the present invention is rotated by the adjusting handle 15 before use; the adjusting U-ring 13 is rotated by the adjusting handle 15; the adjusting U-shaped ring 13 drives the adjusting threaded wheel 14 to rotate; State; that is, the inner ring 9 is in a stationary state; the inner ring 9 is engaged with the external thread on the adjusting threaded wheel 14; therefore, when the adjusting threaded wheel 14 rotates, the adjusting threaded wheel 14 moves along the axis of the adjusting threaded wheel 14, ie The relative position of the adjustment screw wheel 14 to the drive spring 6 can be controlled by adjusting the adjustment knob 15; thereby controlling the initial elastic performance of the drive spring 6. In turn, the maximum torque that can be transmitted by the drive spring 6 is controlled; the initial elastic performance of the thread is adjusted; the control drive motor 1 starts to work; the drive motor 1 drives the drive shaft 5 to rotate; the drive shaft 5 drives the two spring-mounted discs. 8 rotation; two spring fixed discs 8 drive the drive spring 6 to rotate; the drive spring 6 rotates to drive the transmission gear 7 to rotate; the transmission gear 7 drives the gear The shaft 11 is rotated; the rotational force can be transmitted to the tire of the wheelchair through the gear shaft 11; and the wheelchair is driven by the rotation of the tire; in the present invention, the initial elastic performance of the drive spring 6 when the drive transmission gear 7 rotates is determined; After the driving motor 1 is operated, the speed at which the driving motor 1 drives the driving shaft 5 to rotate is gradually increased, since the weight 19 is mounted at the lower end of the connecting rod 27, and the weight 19 is located in the first centrifugal groove 20; And the first adjusting teeth 16 are respectively located on opposite sides of the transmission shaft 5; therefore, under the action of centrifugation, the weight 19 will drive the connecting rod 27 to move away from the side of the first adjusting tooth 16; the connecting rod 27 drives The first adjusting tooth 16 moves toward the inner side of the propeller shaft 5; and the second adjusting tooth 23 gradually moves to the outside of the propeller shaft 5 under the action of centrifugal force; the first adjusting tooth 16 is the first adjusting tooth during the initial movement The binding force of the pair of teeth 16 to the drive spring 6 is gradually reduced; and the second adjustment tooth 23 has not moved out of the transmission shaft 5; as shown in Fig. 20 (ab), the 吋 drive spring 6 can transmit Torque Continuously decreasing; when the first adjustment tooth 16 is about to completely move to the inner side of the transmission shaft 5, the second adjustment tooth 23 also just moves out of the transmission shaft 5; then the first adjustment tooth 16 and the second adjustment tooth 23 pair The binding force of the driving spring 6 is minimum; as shown in the paragraph (bc) of Fig. 20, that is, the torque transmitted by the driving spring 6 is the smallest; and when the first adjusting tooth 16 is completely moved to the inner side of the transmission shaft 5, the second adjusting tooth 23 The height of the moving drive shaft 5 is also gradually increased; the binding force of the second adjusting tooth 23 to the driving spring 6 is gradually increased; as shown in Fig. 20 (cd), that is, the driving spring 6 can transmit The torque is also continuously increased; when the second adjusting tooth 23 completely moves out of the transmission shaft 5 吋; the torque transmitted by the driving spring 6 also reaches the maximum stable state; as shown in Fig. 21, the rotational speed of the transmission gear 7 is also stabilized. status. People use wheelchairs, when people drive the motor 1 to shut down because of wrong operation; the drive motor 1 will work; the tire will turn; and the people will subconsciously grip the wheelchair tires; When the turning torque is large, it is possible to sprain the arm; therefore, in the present invention, by controlling the binding force of the first adjusting tooth 16 and the second adjusting tooth 23 to the driving spring 6, the gripping of the tire is performed; The tooth 16 and the second adjustment tooth 23 have the least binding force to the drive spring 6; that is, the torque transmitted by the drive spring 6 is the smallest; that is, the torque of the wheelchair tire is the smallest; this is when the person grips the wheelchair tire; Stopping the rotation; and after the tire stops rotating, the transmission gear 7 will squeeze the drive spring 6; so that the drive spring 6 is compressed; and when the spring is compressed to the limit 吋; the drive spring 6 will again drive the transmission gear 7 to rotate; The driver has adjusted or has turned the drive motor 1 off; therefore, in the present invention, the load of the transmission gear 7 can be delayed by controlling the elasticity of the drive spring 6. However, to increase the drive spring 6 inch driven again to rotate the transmission gear between 7 inches; with the elastic drive spring inch by 6 The force can absorb the impact of a part of the transmission gear 7 on the transmission shaft 5; that is, the transmission shaft 5 is protected; and the drive motor 1 is protected. In the present invention, the elastic performance of the drive spring 6 is adjusted in the initial state. During the rotation of the adjustment threaded wheel 14, the internal thread of the adjustment threaded wheel 14 is just engaged with the drive spring 6; therefore, the adjustment of the threaded wheel 14 during the movement There is no interference with the drive spring 6; in the present invention, the tooth inclination angle of the second adjustment tooth 23 is larger than the tooth inclination angle of the first adjustment tooth 16; that is, the second adjustment tooth 23 is moved to the transmission shaft 5 The binding force of the outermost jaw to the drive spring 6 is greater than the binding force of the first adjustment tooth 16 to the drive spring 6 in the initial state; that is, the torque of the drive spring 6 initially driving the transmission gear 7 is smaller than the drive spring 6 after the transmission gear 7 is stabilized. The torque of the drive transmission gear 7 is driven. In the present invention, since the weight 19 is mounted as a whole on the drive shaft 5 and mounted on the lower side of the connecting rod 27; therefore, when the weight 19 is moved, the weight 19 will drive all the connecting rods 27 to move; All the first adjusting teeth 16 are driven to move; therefore, the binding force of all the first adjusting teeth 16 on the driving shaft 5 to the driving spring 6 is synchronously changed; that is, the driving spring 6 transmits the torque 吋, the driving spring 6 The portion that acts on the transmission gear 7 as a whole receives the pressing force of the transmission gear 7 against the drive spring 6 during the rotation; in the present invention, all of the first adjustment teeth 16 on the toothed connecting plate 22 and the transmission shaft 5 are present. Connected together; therefore, all the second adjusting teeth 23 on the transmission shaft 5 will move together under the centrifugal action; that is, the binding force of the second adjusting teeth 23 on the driving shaft 5 to the driving spring 6 is synchronously changed; that is, the driving spring 6 At the transmission torque 吋, the portion of the drive spring 6 that acts on the transmission gear 7 as a whole receives the pressing force of the transmission gear 7 against the drive spring 6 during the rotation.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: A wheelchair designed by the present invention is used by a person to rotate the adjusting handle 15 before use; the adjusting knob 15 is used to drive the adjusting U-ring 13 to rotate; the adjusting U-ring 13 drives the adjusting threaded wheel 14 to rotate; The motor 1 is in a stop state; that is, the inner ring gear 9 is in a stationary state; the inner ring gear 9 is engaged with the external thread on the adjusting thread wheel 14; therefore, when the adjusting thread wheel 14 is rotated, the adjusting thread wheel 14 is adjusted along the adjusting thread wheel. The 14 axis moves, i.e., the relative position of the adjustment threaded wheel 14 to the drive spring 6 can be controlled by adjusting the adjustment handle 15; thereby controlling the initial elastic performance of the drive spring 6. In turn, the maximum torque that can be transmitted by the drive spring 6 is controlled; the initial elastic performance of the thread is adjusted; the control drive motor 1 starts to work; the drive motor 1 drives the drive shaft 5 to rotate; the drive shaft 5 drives the two spring-mounted discs. 8 rotation; two spring fixed discs 8 drive the drive spring 6 to rotate; the drive spring 6 rotates to drive the transmission gear 7 to rotate; the transmission gear 7 drives the gear shaft 11 to rotate; through the gear shaft 11 can transmit the rotational force to the tire of the wheelchair; In turn, the wheelchair is driven by the rotation of the tire. Industrial applicability

 [0045] The present invention has been successfully developed and has been used in the field of industrial technology; therefore, the present invention has industrial applicability.

The present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the invention is defined by the appended claims All changes in the meaning and scope of equivalent elements are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim.

In addition, it should be understood that, although the description is described in the embodiments, the embodiments are not intended to be As a whole, the technical solutions in the embodiments may also be combined as appropriate to form other embodiments that can be understood by those skilled in the art.

Claims

Claim  [Claim 1] A worm gear mechanism for a wheelchair, comprising: a drive motor, a motor support , ring gear support, fixed plate, drive shaft, drive spring, transmission gear, spring fixed disc , internal gear ring, curved connecting plate, gear shaft, connecting disc, adjusting U-ring, adjusting thread wheel, adjusting handle, first adjusting tooth, spring fixing plate, compression spring, weight, first centrifugal groove, a tension spring, a tooth connecting plate, a second adjusting tooth, a second centrifugal groove, a second tooth groove, a first tooth groove, a connecting rod, wherein the driving motor is mounted on the fixing plate through the motor support; The output shaft of the driving motor is connected; the outer circular surface of the driving shaft is evenly encirculated with a plurality of first tooth grooves in the axial direction; the lower side of the first tooth groove has a first centrifugal groove, and each of the first teeth The slots are all communicated with the first centrifugal groove; the first centrifugal groove passes through the center of the transmission shaft; the outer circular surface of the transmission shaft is evenly distributed with a plurality of second tooth grooves in the axial direction; the lower side of the second tooth groove There is a second centrifugal groove, and each of the second tooth slots is in communication with the second centrifugal groove; the first tooth groove is at an angle of ninety degrees with the adjacent second tooth groove; each first tooth The structure installed in the socket is exactly the same; for any one of them The spring fixing plate is mounted at one end of the first tooth groove near the axis of the transmission shaft; the first adjusting tooth is mounted at one end of the first tooth groove away from the axis of the transmission shaft; one end of the connecting rod is mounted on the first adjusting tooth The other end of the connecting rod is located in the first centrifugal groove through the spring fixing plate; a compression spring is installed between the spring fixing plate and the first adjusting tooth; the weight is installed at the lower end of the connecting rod, and the weight is located in the first centrifugal In the slot; the weight and the first adjustment tooth are respectively located on two sides of the transmission shaft symmetrical; the structure of each second tooth groove is completely the same; for any one of them, the second adjustment tooth is mounted on the second tooth One end of the socket away from the axis of the drive shaft; the tooth connecting plate is mounted at the lower end of the second adjusting tooth, and the tooth connecting plate is located in the second centrifugal groove; the tooth connecting plate is evenly installed between the second centrifugal groove There are a plurality of tension springs; a spring fixing disc is respectively mounted on both ends of the transmission shaft, and two spring fixing discs are respectively located on both sides of the first adjusting tooth and the second adjusting tooth; The two ends are respectively mounted on two spring fixing discs, and the driving spring is nested on the transmission shaft; the driving springs respectively cooperate with the first adjusting teeth and the second adjusting teeth mounted on the transmission shaft; adjusting the thread wheel External thread on the outer circumference; internal thread on the inner circumference of the adjustment thread wheel; adjustment thread The wheel is mounted on the drive shaft, and the adjusting thread wheel is located between the two spring fixing discs; the internal thread on the adjusting thread wheel is matched with the driving spring; one end of the adjusting U-ring is mounted on the adjusting handle; adjusting the U-ring One end of the adjusting handle is mounted on the drive shaft; the other end of the adjusting U-ring is mounted on the end face of the adjusting thread wheel away from the driving motor; the inner ring is mounted on the fixing plate by the ring gear support, and the inner ring gear Nesting and adjusting the outer side of the threaded wheel; the inner ring gear is matched with the external thread on the adjusting thread wheel; the two end portions of the inner ring gear remotely from the driving motor are symmetrically mounted with two curved connecting plates; the connecting disc is mounted on the transmission shaft Upper, and the connecting disc is connected with two arc connecting plates; one end of the gear shaft is mounted on a fixing plate near one side of the driving motor; the transmission gear is mounted at the other end of the gear shaft; the transmission gear is meshed with the driving spring;  The tooth inclination angle of the second adjustment tooth is greater than the tooth inclination angle of the first adjustment tooth; the adjustment thread wheel acts on the drive spring limit position;  The adjusting the handle can be used to control the relative position of the adjusting threaded wheel and the driving spring before use; thereby controlling the initial elastic performance of the driving spring; the worm gearing mechanism is in the working state, the second adjusting tooth is in the tension spring and The maximum height of the outer side of the drive shaft under the combined action of the centrifugal force is smaller than the clearance between the transmission gear and the drive spring, the gap between the transmission gear and the outer circular surface of the drive shaft; in the working state, the second adjustment tooth is in the tension spring and the centrifugal force Under the action, the maximum height outside the transmission shaft is smaller than the adjustment screw wheel and the driving spring engagement 吋, and the gap between the thread wheel and the outer circular surface of the transmission shaft is adjusted.  [Claim 2] A worm gear mechanism for a wheelchair according to claim 1, wherein: in the initial state, the worm drive mechanism is driven by a combination of a compression spring and a weight. The height of the outer side of the shaft is smaller than the gap between the transmission gear and the driving spring, the gap between the transmission gear and the outer circumference of the transmission shaft; in the initial state, the height of the first adjustment tooth is outside the transmission shaft under the action of the compression spring and the weight Less than the adjustment threaded wheel and the drive spring engagement 吋, adjust the gap between the threaded wheel and the outer circular surface of the drive shaft.