A belt clutch

Abstract

The present invention discloses a belt clutch, belonging to the field of mechanical motion technology. It comprises a driving pulley installed on the output shaft of the engine and a driven pulley installed on the input shaft of the gearbox. A belt is sleeved on the outer circumference of the driving pulley and the driven pulley. A tensioning wheel capable of tightening the belt is arranged on the outer side of the belt. The tensioning wheel is connected to a worm screw machine driven by a motor. The present invention has a simple structure and is easy to operate. It can slowly transmit the power of the engine to the gearbox. When the input shaft of the gearbox needs to stop rotating, the tensioning wheel moves backward, the belt is loosened, and the input shaft of the gearbox stops rotating. When power input is needed again, the tensioning wheel moves forward, tightens the belt, and the rotation resumes. Frequent starting of the engine can be avoided, and the rotation of the engine output shaft can be slowly transmitted to the input shaft of the gearbox, so that the equipment starts smoothly and damage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical motion, and in particular to a clutch. Background Art

[0002] The power transmission between the engine and the gearbox is generally direct transmission, but it is not applicable when there is a certain distance between the engine and the gearbox, belt drive is required, and the speed needs to be started slowly and increased gradually. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the background technology and to propose a belt clutch which is simple in structure, convenient and practical.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A belt clutch comprises a driving pulley mounted on an engine output shaft and a driven pulley mounted on a gearbox input shaft, belts are sleeved on the outer circumferences of the driving pulley and the driven pulley, a tensioning pulley capable of tightening the belt is arranged on the outer side of the belt, and the tensioning pulley is connected to a worm gear screw machine driven by a motor.

[0006] A further improvement of the present invention is that the worm gear screw machine includes a worm driven by a motor, a worm wheel meshing with the worm and having a threaded hole, and a screw screwed with the thread of the worm wheel, and one end of the screw is fixedly connected to the tension wheel.

[0007] A further improvement of the present invention is that the tensioning wheel is rotatably mounted on the tensioning wheel frame, and the tensioning wheel frame is fixedly connected to the screw rod through a connecting pin.

[0008] A further improvement of the present invention is that: the tensioning wheel frame is also provided with a supporting wheel whose axis is parallel to the tensioning wheel and can rotate.

[0009] A further improvement of the present invention is that guide blocks for limiting the movement track of the tensioning wheel frame are arranged on both sides of the tensioning wheel frame.

[0010] A further improvement of the present invention is that the worm gear screw machine and the guide block are fixedly arranged on the chassis, and a limit switch for providing a limit for the tensioning wheel frame is also arranged on the chassis.

[0011] A further improvement of the present invention is that an idler wheel for tightening the belt is arranged on the inner side of the belt, and a limiting wheel parallel to the axis of the idler wheel is also arranged on the outer side of the belt.

[0012] A further improvement of the present invention is that two pressing wheels for pressing the belt against the outer circumference of the driven pulley are arranged on the outer circumference of the driven pulley.

[0013] A further improvement of the present invention is that a speed sensor I is arranged on the driving pulley, a speed sensor II is arranged on the driven pulley, and both the speed sensor I and the speed sensor II are connected to a controller for controlling the motor.

[0014] A further improvement of the present invention is that the motor is a reduction motor or a stepping motor, and the belt is a V-belt.

[0015] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0016] The invention has a simple structure and is easy to operate. It can transmit the power of the engine to the gearbox by tightening the belt through the tensioning wheel. When the gearbox input shaft needs to stop rotating, the tensioning wheel moves backward and the supporting wheel supports the belt to prevent it from falling off. The belt is loose and the gearbox input shaft stops rotating. When power input is needed again, the tensioning wheel moves forward to tighten the belt and resume rotation, thereby realizing power transmission, which can avoid frequent starting of the engine and slowly transmit the rotation of the engine output shaft to the gearbox input shaft, so that the equipment starts smoothly and reduces damage.

[0017] The linear movement of the tension wheel is driven by a worm gear screw machine driven by a motor, and the speed is controllable. The use of a reduction motor or a stepper motor can accurately control the displacement of the tension wheel, and then control the tightness of the belt to ensure better power transmission.

[0018] The tensioning wheel is rotatably installed on the tensioning wheel frame, so that the movement between the belt and the tensioning wheel can be pure rolling, avoiding serious damage to the belt due to friction; a supporting wheel is also arranged on the tensioning wheel frame, and when the tensioning wheel frame is adjusted back to relax the belt, the supporting wheel supports the relaxed belt to prevent the belt from slipping and making it impossible to start the equipment again.

[0019] Guide blocks are arranged on both sides of the tensioner pulley frame, which act as guide rails and can limit the moving direction of the tensioner pulley frame to always remain in a position nearly perpendicular to the belt. The tensioner pulley frame can be moved to push the tensioning pulley forward, or the supporting pulley can be used to pull the belt backward, thereby causing the belt to slip in the wheel groove of the driving pulley and then fall off, resulting in failure of the belt transmission.

[0020] A limit switch is set on the chassis. When the tensioner frame retreats to the position of the limit switch, the tensioner frame touches the limit switch, the motor stops running, the tensioner frame stops moving, and the belt is in a relaxed state, which can prevent the supporting wheel from tightening the belt and transmitting the power of the engine.

[0021] An idler wheel is arranged on the inner side of the belt to tighten the belt; a limiting wheel is arranged on the outer side of the belt to prevent the belt from falling off and to limit the belt in a loose state.

[0022] Two tension wheels are arranged on the outer circumference of the driven pulley. A V-belt is used to prevent the belt from falling off in a loose state. The V-grooves of the two tension wheels, the driving pulley and the driven pulley limit the belt in a loose state. In addition, the use of a V-belt can increase the friction of the belt transmission.

[0023] A speed sensor I is set on the driving pulley, and a speed sensor II is set on the driven pulley. Both the speed sensor I and the speed sensor II are connected to the controller of the control motor. The speed of the driven pulley is controlled by the speed sensor II and the controller. When the gearbox is started, the tensioning pulley becomes tighter and tighter against the belt, and the speed of the driven pulley becomes higher and higher. During this process, the speed of the driven pulley measured by the speed sensor II is compared with the speed of the driving pulley measured by the speed sensor I at all times. When the speed of the driven pulley is lower than that of the driving pulley, the motor keeps driving the screw forward, the belt becomes tighter and tighter, and the speed of the driven pulley becomes higher and higher, until the speed ratio of the driven pulley to the driving pulley is close to one, the motor stops, and the power of the engine is transmitted to the gearbox; on the contrary, when the motor reverses and the belt becomes looser and looser, the speed ratio of the driven pulley to the driving pulley becomes smaller and smaller until it is zero, and the motor stops. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Among them: 1, worm gear 2, screw rod 3, worm gear 4, motor 5, connecting pin 6, tensioning wheel 7, tensioning wheel frame 8, pressure wheel 9, driven pulley 10, gearbox input shaft 11, speed sensor I 12, supporting wheel 13, idler wheel 14, limit wheel 15, speed sensor II16, driving pulley 17, engine output shaft 18, chassis 19, belt 20, guide block 21, limit switch.

[0026] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0027] A belt clutch, such as Figure 1 As shown, it includes a driving pulley 16 installed on the engine output shaft 17 and a driven pulley 9 installed on the gearbox input shaft 10. A belt 19 is sleeved on the outer circumference of the driving pulley 16 and the driven pulley 9. A tensioning wheel 6 is arranged on the outer side of the belt 19. The tensioning wheel 6 can tighten the belt 19. The tensioning wheel 6 is driven by a worm gear screw machine driven by a motor 4.

[0028] The worm screw machine comprises a worm 3 driven by a motor 4 and a worm wheel 1 meshed with the worm 3. The center of the worm wheel 1 is provided with a threaded hole, and a screw 2 is screwed into the threaded hole.

[0029] The tensioning wheel 6 is rotatably mounted on the tensioning wheel frame 7. The tensioning wheel frame 7 is also provided with a supporting wheel 12. The axis of the supporting wheel 12 is parallel to the axis of the tensioning wheel 6 and can be rotatably mounted on the tensioning wheel frame 7. The tensioning wheel frame 7 is fixedly connected to the screw rod 2 via a connecting pin 5.

[0030] A plurality of guide blocks 20 are arranged on both sides of the tensioning wheel frame 7 , and the guide blocks 20 act as guide rails for limiting the movement trajectory of the tensioning wheel frame 7 .

[0031] The worm screw machine and the guide block 20 are fixedly arranged on the chassis 18 . A limit switch 21 is also arranged on the chassis 18 . The limit switch 21 is used to provide a limit for the tensioning wheel frame 7 .

[0032] An idler wheel 13 is arranged on the inner side of the belt 19 , and the idler wheel 13 is used to tighten the belt 19 . A limiting wheel 14 parallel to the axis of the idler wheel 13 is also arranged on the outer side of the belt 19 .

[0033] Two pressure wheels 8 are arranged on the outer circumference of the driven belt pulley 9 , and the two pressure wheels 8 press the belt 19 onto the outer circumference of the driven belt pulley 9 .

[0034] A speed sensor I15 is arranged on the driving pulley 16 , and a speed sensor II11 is arranged on the driven pulley 9 . Both the speed sensor I15 and the speed sensor II11 are connected to a controller for controlling the motor 4 .

[0035] The motor 4 is a reduction motor or a stepping motor, and the belt 19 is a V-belt with large friction.

Claims

1. A belt clutch, characterized in that: It comprises a driving pulley (16) mounted on an engine output shaft (17) and a driven pulley (9) mounted on a gearbox input shaft (10), a belt (19) being sleeved on the outer circumference of the driving pulley (16) and the driven pulley (9), a tensioning wheel (6) capable of tightening the belt (19) being arranged on the outer side of the belt (19), and the tensioning wheel (6) being connected to a worm gear screw machine driven by a motor (4); The worm gear screw machine comprises a worm (3) driven by a motor (4), a worm wheel (1) meshing with the worm (3) and having a threaded hole, and a screw (2) screwed with the thread of the worm wheel (1), one end of the screw (2) being fixedly connected to a tension wheel (6); The tension wheel (6) is rotatably mounted on a tension wheel frame (7), and the tension wheel frame (7) is fixedly connected to the screw rod (2) via a connecting pin (5); The tension wheel frame (7) is also provided with a supporting wheel (12) whose axis is parallel to the tension wheel (6) and can rotate. Guide blocks (20) for limiting the movement trajectory of the tensioning wheel frame (7) are arranged on both sides of the tensioning wheel frame (7); The worm gear screw machine and the guide block (20) are fixedly arranged on a chassis (18), and a limit switch (21) for providing a limit position for the tensioning wheel frame (7) is also arranged on the chassis (18); An idler wheel (13) for tightening the belt (19) is disposed on the inner side of the belt (19), and a limiting wheel (14) parallel to the axis of the idler wheel (13) is also disposed on the outer side of the belt (19); Two pressing wheels (8) are arranged on the outer circumference of the driven pulley (9) to press the belt (19) onto the outer circumference of the driven pulley (9); A speed sensor I is provided on the driving pulley (16), and a speed sensor II is provided on the driven pulley (9), and both the speed sensor I and the speed sensor II are connected to a controller for controlling the motor (4); When the gearbox is started, the tensioning wheel (6) is increasingly tightened against the belt (19), and the speed of the driven pulley (9) is increasingly increased. During this process, the speed of the driven pulley (9) measured by the speed sensor II (15) and the speed of the driving pulley (16) measured by the speed sensor I (11) are constantly compared. When the speed of the driven pulley (9) is lower than the speed of the driving pulley (16), the motor (4) continues to drive the screw rod (2) forward, the belt (19) becomes increasingly tight, and the speed of the driven pulley (9) becomes increasingly higher, until the speed ratio of the driven pulley (9) to the driving pulley (16) approaches one, at which time the motor stops and the power of the engine is transmitted to the gearbox. On the contrary, when the motor (4) rotates in the reverse direction and the belt (19) becomes increasingly loose, the speed ratio of the driven pulley (9) to the driving pulley (16) becomes increasingly smaller until it becomes zero, at which time the motor stops.

2. A belt clutch according to claim 1, characterized in that: The motor (4) is a reduction motor or a stepping motor, and the belt (19) is a V-belt.

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