A clutch mechanism for a drive system and a drive system

Abstract

The present invention relates to a clutch mechanism for a drive system, which includes a coupling sleeve, a force-releasing key, a clutch ring, needle rollers and a clutch gear. Needle rollers are arranged on both sides of the clutch gear, the clutch ring is sleeved outside the needle rollers, the coupling sleeve is sleeved outside the clutch ring, the other end of the coupling sleeve is connected to the output wheel shaft of the drive system, and the force-releasing key is installed between the coupling sleeve and the clutch ring. The present invention can drive the needle rollers to push the clutch ring to rotate under the drive of the clutch gear, so as to drive the coupling sleeve to rotate, facilitating the driving of the handcart. And with the cooperation of the force-releasing key, the resistance generated by the drive system during hand-pushing can be reduced, achieving the effect of easy use.

Description

Technical Field

[0001] The present invention relates to the technical field of trolleys, and in particular to a clutch mechanism for a drive system and a drive system. Background Art

[0002] With the development needs of society, more and more wheeled trolley vehicles, such as push lawn mowers, push golf carts, push snow blowers, push flatbed trucks, push baby carriages and other machines, have added an electric assist function. For a wheeled trolley vehicle equipped with this drive system, when traveling with motor assistance, due to the large speed ratio of the drive system, the wheeled vehicle can travel easily; when the wheeled vehicle is pushed manually, due to the clutch function of the drive system, the resistance generated by the motor on the wheels is reduced, and it is relatively easy for the driver to push the wheeled vehicle.

[0003] Traditional wheeled trolley vehicles are installed with a drive system without a clutch function. The reduction ratio between the motor and the wheels is small, the motor is relatively large, the cost is high, and the forward resistance is also large. Moreover, traditional wheeled trolley vehicles are installed with a drive system without a clutch function. There is only one shaft at the output end, the turning resistance is large, it is not flexible, and the wheels wear relatively large. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, one of the purposes of the present invention is to provide a clutch mechanism for a drive system.

[0005] The above invention purpose of the present invention is achieved through the following technical solutions:

[0006] A clutch mechanism for a drive system includes a coupling sleeve, a force-releasing key, a clutch ring, needle rollers and a clutch gear. Needle rollers are arranged on both sides of the clutch gear. The clutch ring is sleeved on one side of the needle rollers. The coupling sleeve is sleeved outside the clutch ring. The other end of the coupling sleeve is connected to the output wheel shaft of the drive system. The force-releasing key is installed between the coupling sleeve and the clutch ring.

[0007] By adopting the above technical solution, under the rotation of the clutch gear, the needle rollers on one side of the clutch gear roll under the push of the clutch gear and drive the clutch ring sleeved outside the clutch gear to rotate. Driven by the clutch ring, the coupling sleeve drives the output wheel shaft to rotate, realizing electric control; when the output wheel shaft rotates, driven by the coupling sleeve, the force-releasing key drives the needle rollers to rotate, separating the needle rollers from the clutch ring, thereby avoiding the torque of the clutch ring being transmitted to the surface of the clutch gear and realizing manual pushing, which is convenient to use.

[0008] In a preferred embodiment, the present invention can be further configured as follows: torsion output bosses are symmetrically distributed at both ends of the clutch gear, and one or more thrust arms and one or more needle contact surfaces are provided on the torsion output bosses. The needle contact surfaces are located on the sides of the thrust arms, and the needles are located on the sides of the needle contact surfaces.

[0009] By adopting the above technical solution, driven by the thrust arm, the needle contact surface drives the needle to roll. Under the eccentric thrust of the needle on the needle contact surface, the clutch ring is subjected to a large extrusion force, so that the needle pushes the clutch ring to rotate.

[0010] In a preferred embodiment, the present invention can be further configured as follows: each needle is arranged on the same side of the closest needle contact surface along the circumferential direction of the torsion output boss, and the other side of the thrust arm is the force release key.

[0011] By adopting the above technical solution, when the thrust arm rotates towards the side of the needle, driven by the thrust arm, the needle contact surface pushes the needle to roll. Under the push of the needle, the clutch ring rotates, driving the coupling sleeve and the output gear to rotate; when the thrust arm rotates in the reverse direction, the thrust arm pushes the force release key to rotate. Driven by the force release key, the needle and the clutch ring are separated, preventing the coupling sleeve and the output gear from rotating in the reverse direction.

[0012] In a preferred embodiment, the present invention can be further configured as follows: needle contact surfaces are provided on both sides of each thrust arm, and the needles are provided on the sides of each needle contact surface.

[0013] By adopting the above technical solution, the thrust arm with needles provided on both sides can drive the clutch ring to rotate clockwise or counterclockwise, thereby driving the output wheel shaft to rotate clockwise or counterclockwise.

[0014] In a preferred embodiment, the present invention can be further configured as follows: a washer and a spring piece are further provided inside the coupling sleeve. The washer and the spring piece are sequentially sleeved outside the output wheel shaft. One side of the spring piece abuts against the coupling sleeve, and the other side abuts against the washer. The side of the washer away from the spring piece abuts against the force release key.

[0015] By adopting the above technical solution, during use, the spring piece and the washer can effectively reduce the resistance between the coupling sleeve and the force release key. Especially when operating manually, the output wheel shaft only needs a small force to drive the force release key to rotate, which is convenient to use.

[0016] Another object of the present invention is to provide a drive system.

[0017] The above object of the present invention is achieved by the following technical solutions:

[0018] A drive system includes the clutch mechanism, the driving member, and the speed-changing mechanism. The output wheel shaft is installed in the middle of the housing. The driving member and the speed-changing mechanism are both installed inside the housing. The output end of the driving member is connected to the speed-changing mechanism, and the speed-changing mechanism is connected to the clutch mechanism.

[0019] By adopting the above technical solution, driven by the driving member, after the speed-changing mechanism adjusts the speed, it drives the clutch mechanism and the output wheel shaft located inside the clutch mechanism to rotate.

[0020] In a preferred example of the present invention, it can be further configured that: bearings and snap rings are arranged inside the housing, and the output wheel shaft is connected to the housing through the bearings and snap rings.

[0021] By adopting the above technical solution, the snap ring and the bearing can improve the connection stability between the housing and the output wheel shaft.

[0022] In a preferred example of the present invention, it can be further configured that: the output wheel shaft is connected to the clutch gear through a connecting shaft.

[0023] By adopting the above technical solution, the connecting shaft can improve the connection stability between the output wheel shaft and the clutch gear, and avoid interference between the output wheel shaft and the clutch gear during the processing, which affects the normal operation of the equipment.

[0024] In summary, the present invention includes at least one of the following beneficial technical effects:

[0025] 1. Adopting the technical solution of the clutch assembly composed of a coupling sleeve, a force-releasing key, a clutch ring, a needle roller, and a clutch gear, so that the needle roller can push the clutch ring to rotate under the drive of the clutch gear, thereby driving the coupling sleeve to rotate, facilitating the pushing of the handcart, and with the cooperation of the force-releasing key, it can reduce the resistance generated by the drive system during hand-pushing, achieving the effect of convenient use;

[0026] 2. Adopting the technical solution of the clutch assembly composed of a torque output boss, a thrust arm, and a needle roller contact surface, so that the needle roller contact surface can drive the needle roller to roll under the drive of the thrust arm, thereby generating a large extrusion force and achieving the effect of rotating the output wheel shaft;

[0027] 3. Adopting the technical solution of arranging elastic sheets and washers inside the coupling sleeve, so that the resistance between the coupling sleeve and the force-releasing key can be reduced, the speed during hand-pushing can be increased, and the use is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To make the content of the present invention more clearly understood, the following further details the present invention according to specific embodiments in conjunction with the accompanying drawings, where

[0029] Figure 1 is a schematic diagram of the installation structure of the present invention.

[0030] Figure 2 is an exploded structure diagram of Embodiment 1.

[0031] Figure 3 is a connection structure diagram of Embodiment 1.

[0032] Figure 4 is a sectional structure diagram of Embodiment 1.

[0033] Figure 5 is a structure diagram of the clutch gear in Embodiment 1.

[0034] Figure 6 is a connection structure diagram of the clockwise rotation in Embodiment 1.

[0035] Figure 7 is a connection structure diagram of the counterclockwise rotation in Embodiment 1.

[0036] Figure 8 is a connection structure diagram of the rotation in Embodiment 2.

[0037] The reference numerals in the drawings are:

[0038] 1: Wheeled vehicle; 2: Wheel; 3: Drive system; 4: Output wheel shaft; 4A: First output wheel shaft; 4B: Second output wheel shaft; 4a: Flat step; 5, Coupling sleeve; 5-a1, 5-a2: Stopper; 5-b: Flat hole; 6: Force release key; 6-a: Boss; 6-b1, 6-b2, 6-b3, 6-b4: Pushing surface; 7: Clutch ring; 7-a: Cylindrical surface; 7-b1, 7-b2: Pusher; 8: Needle roller; 9: Clutch gear; 9-a1, 9-a2: Torque output boss; 9-b1, 9-b2: Thrust arm; 9-c1, 9-c2, 9-c3, 9-c4: Needle roller contact surface; 10: Connecting shaft; 11: Bearing; 12: Snap ring; 13: Driving member; 14: Housing; 14A: First housing; 14B: Second housing; 16: Transmission mechanism; 17: Washer; 18: Belleville spring; 19: Screw. Detailed implementation manners

[0039] The following further details the present invention in conjunction with the accompanying drawings.

[0040] Embodiment 1:

[0041] Refer to Figures 2 - 4, a drive system disclosed in the present invention, includes a housing 14, a driving member 13, a speed-changing mechanism 16, a clutch mechanism, and an output wheel shaft 4. The housing 14 is composed of a first housing 14A and a second housing 14B, and the output wheel shaft 4 is composed of a first output wheel shaft 44A and a second output wheel shaft 44B. In this embodiment, the driving member 13 is a servo motor, which can rotate forward and backward, and is convenient to use. In other embodiments, other driving structures can also be adopted. The driving member 13 is installed on one side of the housing 14B, the first output wheel shaft 4A is installed in the middle of the first housing 14A, and the second output wheel shaft 14B is installed in the middle of the second housing 14B. The two are on the same axis. The output end of the driving member 13 is located inside the housing 14B and is fixedly connected to the speed-changing mechanism 16. In this embodiment, the speed-changing mechanism 16 is a motor gear. In other embodiments, the speed-changing mechanism 16 includes, but is not limited to, transmission structures such as single-stage or multi-stage gear transmission, belt transmission, and chain transmission. The other end of the speed-changing mechanism is connected to the clutch mechanism.

[0042] The clutch mechanism includes a coupling sleeve 5, a force-releasing key 6, a clutch ring 7, a needle roller 8, and a clutch gear 9. The clutch gear 9 is located in the middle of the housing 4, and its outer side is engaged with the speed-changing mechanism 16. Clutch rings 7 are sleeved on both sides of the clutch gear 9. A force-releasing key 6 and a needle roller 8 are arranged inside each clutch ring 7. One side of the force-releasing key 6 abuts against the clutch gear 9, and a coupling sleeve 5 is arranged on the other side. The side of the coupling sleeve 5 away from the force-releasing key 6 is connected to the output wheel shaft 4. Driven by the driving member 13, the clutch gear 9 rotates, thereby driving the needle roller 8 to roll. A large torque is generated during the rolling process, pushing the clutch ring 7 to rotate. The coupling sleeve 5 located outside the clutch ring 7 drives the output wheel shaft 4 to rotate under the push of the clutch ring 7. The symmetrically arranged structure has high synchronism, and the output wheel shafts 4 on both sides are more evenly stressed.

[0043] Refer to Figure 2 , in order to improve the connection stability of the equipment, a flat step 4a is provided on the outer side of the output wheel shaft 4, and a flat hole 5-b is opened inside the small-ring side of the coupling sleeve 5. The flat step 4a is inserted into the flat hole 5-b to improve the connection stability between the output wheel shaft 4 and the coupling sleeve 5, and prevent the two from separating during driving.

[0044] Refer to Figure 5, on both sides of the clutch gear 9, torque output bosses 9-a1 and 9-a2 extend outward from the middle respectively. Each torque output boss 9-a1, 9-a2 extends one or more thrust arms 9-b1, 9-b2 outward. In this embodiment, the number of the thrust arms 9-b1, 9-b2 is two. One or several needle contact surfaces 9-c1, 9-c2, 9-c3, 9-c4 are arranged on the side surfaces of the thrust arms 9-b1, 9-b2. In this embodiment, needle contact surfaces 9-c1, 9-c2, 9-c3, 9-c4 are arranged on both sides of each thrust arm 9-b1, 9-b2. Among them, the two sides of the thrust arm 9-b1 are the needle contact surfaces 9-c1, 9-c2, and the two sides of the thrust arm 9-b2 are both provided with needle contact surfaces 9-c3, 9-c4. The thrust arms 9-b1, 9-b2 with needle contact surfaces 9-c1, 9-c2, 9-c3, 9-c4 arranged on both sides can realize the forward and reverse rotation of the device, which is convenient to use.

[0045] Refer to Figure 2 , in order to improve the efficiency of device pushing, the inner side of the clutch ring 7 adopts a cylindrical surface 7-a. A set of symmetrically arranged push hands 7-b1 and 7-b2 extend outward from the outer side of the clutch ring 7. Among them, the needle roller 8 abuts against the cylindrical surface 7-a; a set of symmetrically arranged stoppers 5-a1 and 5-a2 extend from the inner side surface of the coupling sleeve 5. The push hands 7-b1 and 7-b2 are respectively located on both sides of the stopper 5-a1. With the cooperation of the push hands 7-b1 and 7-b2 and the stoppers 5-a1 and 5-a2, it is convenient to push the coupling sleeve 5 to rotate.

[0046] Refer to Figure 2 and Figure 6, on one side of the force - releasing key 6 extending towards the coupling sleeve 5, there is a boss 6 - a. On the side surface of the boss 6 - a, there are push surfaces 6 - b1, 6 - b2, 6 - b3, 6 - b4. Driven by the coupling sleeve 5, the push surfaces 6 - b1, 6 - b2, 6 - b3, 6 - b4 located on the surface of the boss 6 - a drive the needle rollers 8 to rotate, so that the needle rollers 8 are separated from the clutch ring 7, avoiding the rotation of the clutch ring 7 during manual operation and causing interference. Inside the coupling sleeve 5, there are also a spring piece 18 and a washer 17. One side of the spring piece 18 abuts against the inner side surface of the coupling sleeve 5, and the other side abuts against one side of the washer 17. The side of the washer 17 away from the spring piece 18 abuts against the boss 6 - a of the force - releasing key 6. Driven by the spring piece 18 and the washer 17, there is a small resistance between the coupling sleeve 5 and the force - releasing key 6, thus driving the force - releasing key 6 to rotate with higher efficiency. In order to further reduce the resistance between the coupling sleeve 5 and the force - releasing key 6, ratchet teeth are added on the side of the force - releasing key 6 close to the washer 17, and ratchet teeth are also added on the side of the washer 17 close to the force - releasing key 6. The washer 17 and the force - releasing key 6 are in contact with each other with the mutually engaged ratchet teeth. The central hole of the washer 17 is an oval hole sleeved on the oval step 4a of the output wheel shaft 4, and the outer shell of the washer 17 can move up and down along the center of the output wheel shaft 4. When the torque of the rotation of the output wheel shaft 14 is very large, the ratchet teeth on the force - releasing key 6 and the ratchet teeth on the washer 17 overcome the pressure of the spring piece 18 and are separated from each other, avoiding excessive torque being transmitted from the output wheel shaft 4 to the force - releasing key 6.

[0047] To further improve the stability of the equipment connection, the housing 14 is fixed by screws 19. At both ends inside the housing 14, there are bearings 11. At the bayonet on the outside of the housing 14, there is a snap ring 12 to improve the connection stability between the housing 14 and the output wheel shaft 4. In the middle of the clutch gear 9, there is a connecting shaft 10. One end of the connecting shaft 10 away from the clutch gear 9 is rotatably connected to the output wheel shaft 4 to maintain the stability of the equipment.

[0048] Refer to Figure 6 , driven by the driving part 13, the speed - changing mechanism 16 drives the clutch gear 9 to rotate clockwise. Among them, a similar wedge - shaped structure is formed between the cylindrical surface 7 - a and the needle - roller contact surfaces 9 - c1, 9 - c2, 9 - c3, 9 - c4. When the clutch gear 9 is forced to rotate clockwise, under the eccentric thrust of the needle - roller contact surfaces 9 - c1 and 9 - c3 on the needle rollers 8, the cylindrical surface 7 - a receives a large extrusion force, so that the needle rollers 8 push the clutch ring 7 to rotate clockwise. The pushers 7 - b1, 7 - b2 on the outside of the clutch ring 7 drive the coupling sleeve 5 to rotate, thus driving the output wheel shaft 4 to rotate clockwise.

[0049] Refer to Figure 7, driven by the driving member 13, the speed change mechanism 16 drives the clutch gear 9 to rotate counterclockwise. A structure similar to a wedge structure is formed between the cylindrical surface 7-a and the needle contact surfaces 9-c1, 9-c2, 9-c3, and 9-c4. When the clutch gear 9 is forced to rotate counterclockwise, under the eccentric thrust of the needle 8 on the needle contact surface 9-c1 and the needle contact surface 9-c3, the cylindrical surface 7-a is subjected to a large extrusion force, so that the needle 8 pushes the clutch ring 7 to rotate counterclockwise. The push hands 7-b1 and 7-b2 on the outer side of the clutch ring 7 push the coupling sleeve 5 to rotate, thereby driving the output wheel shaft 4 to rotate counterclockwise.

[0050] When the driving member 13 is powered off and does not work, and the output wheel shaft 4 is forced to rotate, driven by the flat step 4-a, the flat hole 5-b drives the coupling sleeve 5 to rotate following the output wheel shaft 4. A spring piece 18 and a washer 17 are assembled between the coupling sleeve 5 and the force release key 6. The flat central hole of the washer 17 is connected to the flat step 4-a and can move along the step. When the torque of the output wheel shaft 4 rotating is very large, the ratchet teeth on the force release key 6 and the ratchet teeth on the washer 17 disengage from each other against the pressure of the spring piece 18. To avoid excessive torque being transmitted from the output wheel shaft 4 to the force release key 6. There is a relatively small torque between the output wheel shaft 4 and the force release key 6, which pushes the force release key 6 to rotate. When the force release key 6 rotates, the pushing surfaces 6-b1, 6-b2, 6-b3, and 6-b4 will push the needle 8 closer to the thrust arms 9-b1 and 9-b2 on the clutch gear 9. There is a small gap between the needle 8 and the inner cylindrical surface 7-a of the clutch ring 7, and the torque of the clutch ring 7 cannot be transmitted to the clutch gear 9 through the needle 8, thus realizing the function that the output wheel shaft 4 is forced to rotate and the motor shaft does not rotate.

[0051] Refer to Figure 1 , the drive system 3 is installed at the bottom of the wheeled handcart 1, and its output end is connected to the wheel 2, so as to realize the switching between the electric and manual modes. When the wheeled vehicle is pushed manually, due to the clutch function of the drive system, the resistance generated by the motor on the wheel is reduced, and it is easier for the driver to push the wheeled vehicle. The deceleration ratio is relatively large, which is convenient for moving forward.

[0052] Embodiment 2:

[0053] Refer to Figure 8 , the difference feature between this embodiment and Embodiment 1 is that the number of the thrust arms 9-b1 and 9-b2 and the needles 8 are both two, and the needles 8 are all located on one side of the thrust arms 9-b1 and 9-b2 in the clockwise or counterclockwise direction, so as to ensure that the device moves in one direction. Only one rotation direction of the driving member 13 can transmit the torque to the output wheel shaft 4. When the driving member 13 rotates in the other rotation direction, the output wheel shaft 4 will not rotate.

[0054] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A clutch mechanism for a drive system, characterized in that: It includes a coupling sleeve (5), a force release key (6), a clutch ring (7), a needle roller (8), and a clutch gear (9); Clutch rings (7) are sleeved on both sides of the clutch gear (9), and a force release key (6) and a needle roller (8) are arranged inside each clutch ring (7). One side of the force release key (6) abuts against the clutch gear (9), and a coupling sleeve (5) is arranged on the other side; One end of the coupling sleeve (5) is sleeved outside the clutch ring (7), and the other end of the coupling sleeve (5) is connected to the output wheel shaft (4) of the drive system; A set of symmetrically arranged push hands (7-b1, 7-b2) extend from the outer side of the clutch ring (7), and a set of symmetrically arranged stoppers (5-a1, 5-a2) extend from the inner side surface of the coupling sleeve (5) in a matching manner; Torque output bosses (9-a1, 9-a2) are symmetrically distributed at both ends of the clutch gear (9), and one or more thrust arms (9-b1, 9-b2) and one or more needle roller contact surfaces (9-c1, 9-c2, 9-c3, 9-c4) are arranged on the torque output bosses (9-a1, 9-a2). The needle roller contact surfaces (9-c1, 9-c2, 9-c3, 9-c4) are located on the side surfaces of the thrust arms (9-b1, 9-b2), and the needle rollers (8) are located on the side surfaces of the needle roller contact surfaces (9-c1, 9-c2, 9-c3, 9-c4); The inner side of the clutch ring (7) adopts a cylindrical surface (7-a), and a wedge shape is formed between the cylindrical surface (7-a) and the needle roller contact surfaces (9-c1, 9-c2, 9-c3, 9-c4); The clutch gear (9) rotates, thereby driving the needle rollers (8) to roll, and a large torque is generated during the rolling process to push the clutch ring (7) to rotate; A boss (6-a) extends from the side of the force release key (6) facing the coupling sleeve (5), and push surfaces (6-b1, 6-b2, 6-b3, 6-b4) are arranged on the side surface of the boss (6-a). When the force release key (6) rotates, the push surfaces (6-b1, 6-b2, 6-b3, 6-b4) will push the needle rollers (8) close to the thrust arms (9-b1, 9-b2) on the clutch gear (9). There is a small gap between the needle rollers (8) and the inner cylindrical surface (7-a) of the clutch ring (7), and the torque of the clutch ring (7) cannot be transmitted to the clutch gear (9) through the needle rollers (8).

2. The clutch mechanism for a drive system according to claim 1, characterized in that: Each of the needle rollers (8) is arranged along the circumferential direction of the torque output bosses (9-a1, 9-a2) on the same side of the closest needle roller contact surface (9-c1, 9-c2, 9-c3, 9-c4), and the other side of the thrust arm (9-b1, 9-b2) is the force release key (6).

3. The clutch mechanism for a drive system according to claim 1, wherein: Needle roller contact surfaces (9-c1, 9-c2, 9-c3, 9-c4) are arranged on both sides of each of the thrust arms (9-b1, 9-b2), and the needle rollers (8) are arranged on the side surfaces of each of the needle roller contact surfaces (9-c1, 9-c2, 9-c3, 9-c4).

4. The clutch mechanism for a drive system according to claim 1, characterized in that: A washer (17) and a shrapnel (18) are further arranged inside the coupling sleeve (5). The washer (17) and the shrapnel (18) are sequentially sleeved outside the output wheel shaft (4). One side of the shrapnel (18) abuts against the coupling sleeve (5), and the other side abuts against the washer (17). The side of the washer (17) away from the shrapnel (18) abuts against the force release key (6).

5. A drive system, characterized in that: It includes the clutch mechanism according to any one of claims 1-4, a driving member (13), a housing (14), a speed change mechanism (16) and an output wheel shaft (4). The output wheel shaft (4) is installed in the middle of the housing (14). The driving member (13) and the speed change mechanism (16) are both installed inside the housing (14). The output end of the driving member (13) is connected to the speed change mechanism (16), and the speed change mechanism (16) is connected to the clutch mechanism.

6. The drive system according to claim 5, characterized in that: The output wheel shaft (4) and the clutch gear (9) are connected by a connecting shaft (10).

7. A drive system according to claim 5, wherein: A bearing (11) and a circlip (12) are arranged inside the housing (14). The output wheel shaft (4) and the housing (14) are connected by the bearing (11) and the circlip (12).

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