A speed change cam and shift plate combination for controlling a speed change mechanism and a speed change method thereof

Abstract

The present invention discloses a speed change cam and a shift plate combination for controlling a speed change mechanism, comprising a speed change cam body, a limit rod, a shift plate body, a torsion spring assembly, a transmission tooth block and a transmission tooth block, the outer walls at both ends of the speed change cam body are provided with mounting bearings, and the outer walls at the top and bottom of the mounting bearings are provided with mounting blocks, the inner wall of the mounting block is rotatably connected with a rotating tube through a bearing, and a short rod is provided on the inner wall of the mounting block. When the present invention releases the torsion, the torsion force of the fixed torsion spring drives the rotating tube and the block to rotate, so that the block protrudes from the inside of the through groove, so that the block is clamped in the inside of the mounting hole fixed to the speed change cam body, and this method makes both ends of the speed change cam body rotatably connected to the mounting hole fixed to the speed change cam body through the mounting bearing, thereby avoiding that the outer wall or the mounting hole of the speed change cam body becomes a non-circular shape after the speed change cam body and the mounting hole are worn for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of speed change mechanisms, and in particular to a speed change cam and shift plate combination for controlling a speed change mechanism and a speed change method thereof. Background Art

[0002] A motorcycle is a two-wheeled or three-wheeled vehicle driven by a gasoline engine and steered by a handlebar. The main components of a motorcycle include the engine, transmission system, brakes, suspension, travel, electrical appliances and frame. The engine of a motorcycle is mostly a two-stroke air-cooled gasoline engine. A few large motorcycles use a water-cooled four-stroke 4-6 cylinder gasoline engine. Light motorcycles generally use a 6-speed transmission, and large motorcycles can use a 5-6-speed transmission.

[0003] The gearbox is a motorcycle accessory used to change the speed and torque from the motorcycle, and can fix or change the transmission ratio of the output shaft and the input shaft;

[0004] The speed shift cam is the main component of the transmission and an important component for shifting gears on motorcycles. All components of the speed shift cam are installed in the transmission case of the transmission. The speed shift cam is driven to rotate through the speed shift operating mechanism, thereby driving the shift fork mounted on the speed shift cam to move along the axial direction of the speed shift cam. The shift fork then causes the free gear of the transmission to move to achieve gear shifting.

[0005] Generally, most speed change cams are directly inserted into the reserved mounting holes on the gearbox body. However, during the rotation of the speed change cam, friction will be generated with the mounting holes. Under long-term friction, both the speed change cam and the mounting holes will be slightly worn. Moreover, after the speed change cam and the mounting holes are slightly deformed due to long-term wear, the outer wall of the speed change cam and the mounting holes will become non-circular shapes. In this case, the speed change cam may move when the mounting holes rotate. Therefore, it is urgent to design a speed change cam, a shift plate combination and a speed change method for controlling a speed change mechanism to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a speed change cam, a shift plate combination and a speed change method thereof for controlling a speed change mechanism, so as to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A speed change cam and shift plate combination for controlling a speed change mechanism, comprising a speed change cam body, a limit rod, a shift plate body, a torsion spring assembly, a transmission tooth block and a transmission tooth block, the outer walls of both ends of the speed change cam body are provided with mounting bearings, and the outer walls of the top and bottom of the mounting bearings are provided with mounting blocks, the inner wall of the mounting block is rotatably connected with a rotating tube through a bearing, and a short rod is provided on the inner wall of the mounting block, the rotating tube is sleeved on the outside of the short rod, and a fixed torsion spring connected to the inner wall of the rotating tube is provided on the inner wall of the mounting block, the fixed torsion spring is sleeved on the outside of the short rod, the end of the rotating tube located outside the mounting block is integrally connected with a rotating torque, and a block is integrally connected to the outer wall of the rotating tube, a through groove is provided on the outer wall of the top of the mounting block, and the block passes through the through groove, The outer wall of the speed change cam body is provided with a plurality of sliding grooves, and the inner wall of the sliding groove is provided with an anti-slip groove, the outside of the limit rod is slidably connected with a shift fork, and a connecting rod is integrally connected to the outer wall of the bottom of the shift fork, the bottom end of the connecting rod is slidably connected to the inside of the anti-slip groove, an auxiliary ball is provided at the bottom end of the connecting rod, and the auxiliary ball is rollingly connected to the inside of the anti-slip groove, an anti-slip rod is provided on the outer wall of the connecting rod located inside the anti-slip groove, and the anti-slip rod is slidably connected to the inside of the anti-slip groove, a guide block is provided on the outer wall of the limit rod, and a guide groove is provided inside the shift fork, the guide block is slidably connected to the inside of the guide groove, grooves are provided on the top and outer walls on both sides of the guide block, and balls are provided inside the grooves, and the balls contact the inner walls of the guide grooves.

[0009] Furthermore, a plurality of shifting rods are arranged on the outer wall of one side of the shifting plate body, a replacement cylinder is arranged on the outer wall of one side of the shifting plate body, and the replacement cylinder is inserted into the interior of the speed change cam body.

[0010] Furthermore, a moving block is slidably connected inside the replacement cylinder, and an insert block is provided on the outer wall of the moving block, a slot is opened on the inner wall of the speed change cam body, and the insert block is inserted into the slot, and a spring connected to the moving block is provided on the inner wall of the replacement cylinder.

[0011] Furthermore, a supporting block is slidably connected inside the replacement cylinder, and the supporting block is supported by the moving block.

[0012] Furthermore, an extrusion screw is threadedly inserted on the outer wall of the top of the replacement cylinder, and an extrusion block is arranged on the outer wall of the extrusion screw located inside the replacement cylinder, and the extrusion block contacts the outer wall of the supporting block.

[0013] Furthermore, the torsion spring assembly includes a torsion spring seat and a support block, a stop block is rotatably connected to the outer wall of one side of the support block via a bearing, and the outer walls on both sides of the support block are movably connected to side plates via hinges, a stop torsion spring connected to the side plates is provided on the outer wall of the stop block, and the stop torsion spring is sleeved inside the stop block.

[0014] Furthermore, a fixing block is arranged on the outer wall of the side plate, and the fixing block is inserted into the interior of the torsion spring seat, and a rack is slidably connected to the interior of the torsion spring seat, and the rack is inserted into the interior of the fixing block.

[0015] Furthermore, a rotating rod is rotatably connected to the inner wall of the torsion spring seat via a bearing, and a flat gear and a long gear are respectively provided on the outer wall of the rotating rod, the long gear and the rack are meshed with each other, a toothed plate is slidably connected to the inside of the torsion spring seat, and the toothed plate and the flat gear are meshed with each other, a long neck screw is threadedly inserted on the outer wall of one side of the torsion spring seat, and one end of the long neck screw located inside the torsion spring seat is rotatably connected to the outer wall of the toothed plate via a bearing.

[0016] Furthermore, a change rod is arranged on the inner wall of the transmission gear block, and a shift block is arranged on the outer wall of one side of the transmission gear block.

[0017] A speed changing method for controlling a speed changing mechanism comprises the following speed changing steps:

[0018] S1: When the speed change is required, the change lever is stepped on and rotated downward, the change lever will drive the transmission gear block and the transmission gear block to rotate, the transmission gear block will drive the shift block to rotate the shift lever, the shift lever will drive the shift plate body to rotate, the shift plate body will drive the speed change cam body to rotate, because the shift fork is sleeved on the outside of the limit rod, when the speed change cam body rotates, the bottom end of the connecting rod will slide inside the sliding groove, because the sliding groove has an arc, when the connecting rod slides, it will drive the shift fork to slide outside the limit rod, and the shift fork will push the free gear on the speed change gear of the speed change mechanism to move to achieve gear shifting;

[0019] S2: When the transmission gear block is not engaged with the drive gear block, the torsional force of the stop torsion spring will drive the stop block to rotate, and the stop block will abut against the groove of the shift plate body to fix the shift plate body and prevent the shift plate body from rotating, thus completing the speed change.

[0020] In the above technical solution, the present invention provides a speed change cam, a shift plate combination and a speed change method for controlling a speed change mechanism.

[0021] 1. By setting the mounting bearing, mounting block, rotating tube, short rod, fixed torsion spring, rotating torsion, block and through slot, when the rotating torsion is released, the torsional force of the fixed torsion spring will drive the rotating tube and block to rotate, so that the block protrudes from the inside of the through slot, and the block is clamped in the mounting hole fixed to the speed change cam body. In this way, both ends of the speed change cam body are rotationally connected to the mounting hole fixed to the speed change cam body through the mounting bearing, thereby avoiding the problem that the outer wall of the speed change cam body or the mounting hole will become a non-circular shape after the speed change cam body and the mounting hole are worn for a long time, so that the speed change cam may move when the speed change cam rotates in the mounting hole, and the stability performance is higher;

[0022] 2. By setting the sliding groove, anti-slip groove, limit rod, shift fork, connecting rod, anti-slip rod, auxiliary bead, guide block, guide groove, groove and ball, when the connecting rod slides inside the sliding groove, the anti-slip rod will slide inside the anti-slip groove, which can prevent the anti-slip rod from falling out of the anti-slip groove. The auxiliary column can assist the rotation of the connecting rod and reduce the friction between the connecting rod and the sliding groove. The guide block can guide the shift fork, and the ball can make the shift fork slide more smoothly on the guide block.

[0023] 3. Through the set shift plate body, replacement cylinder, moving block, plug block, slot, spring, holding block, extrusion screw and extrusion block, the extrusion screw is turned to drive the extrusion block to move, at this time the holding block is not squeezed by the extrusion block, the elastic force of the spring will push the moving block to move, the moving block will drive the plug block to move out of the slot, and the shift plate body is pulled to be removed from the speed cam body. When the shift plate body or the shift lever is damaged, it can be replaced;

[0024] 4. Through the set torsion spring seat, stop block, stop torsion spring, side plate, fixed block, rack, rotating rod, flat gear, long gear, toothed plate and long-necked screw, rotating the long-necked screw can drive the toothed plate to move and rotate the flat gear so that the flat gear drives the rotating rod to rotate, and the rotating rod drives the long gear to rotate and mesh with the rack, so that the rack can be moved out from the inside of the fixed block, and the support block and the side plate can be removed from the torsion spring seat. When the torsion force of the stop torsion spring is insufficient, the stop torsion spring can be replaced, which can avoid the situation that the torsion force of the stop torsion spring is insufficient and the stop block cannot stop the paddle plate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 The present invention provides a three-dimensional structural schematic diagram of a speed change cam, a shift plate combination and a speed change method embodiment for controlling a speed change mechanism.

[0027] Figure 2 A schematic diagram of a bearing mounting structure provided for a speed change cam, a shift plate combination and a speed change method embodiment of the present invention for controlling a speed change mechanism.

[0028] Figure 3 The present invention is a schematic diagram of the internal top view of the mounting block provided in an embodiment of a speed change cam, a shift plate combination and a speed change method thereof for controlling a speed change mechanism.

[0029] Figure 4The present invention is a schematic diagram of a sliding groove structure provided in an embodiment of a speed change cam, a shift plate combination and a speed change method thereof for controlling a speed change mechanism.

[0030] Figure 5 The present invention is a schematic diagram of a guide block structure provided in an embodiment of a speed change cam, a shift plate combination and a speed change method thereof for controlling a speed change mechanism.

[0031] Figure 6 The present invention is a schematic diagram of a shift plate main body structure provided by a shift cam, shift plate combination and a shift method embodiment for controlling a shift mechanism.

[0032] Figure 7 The present invention is a schematic diagram of a replacement barrel structure provided by a speed change cam, a shift plate combination and a speed change method embodiment for controlling a speed change mechanism.

[0033] Figure 8 The present invention is a schematic diagram of a torsion spring seat structure provided by a speed change cam, a shift plate combination and a speed change method embodiment for controlling a speed change mechanism.

[0034] Description of reference numerals:

[0035] 1. Shift cam body; 2. Mounting bearing; 3. Mounting block; 4. Rotating tube; 5. Short rod; 6. Fixed torsion spring; 7. Rotating torque; 8. Stopper; 9. Through slot; 10. Sliding slot; 11. Anti-slip slot; 12. Limiting rod; 13. Shift fork; 14. Connecting rod; 15. Anti-slip rod; 16. Auxiliary ball; 17. Guide block; 18. Guide slot; 19. Groove; 20. Ball; 21. Shift plate body; 22. Replacement cylinder; 23. Moving block; 24. Insert block; 25 , slot; 26, spring; 27, abutment block; 28, extrusion screw; 29, extrusion block; 30, torsion spring seat; 31, stop block; 32, stop torsion spring; 33, side plate; 34, fixing block; 35, rack; 36, rotating rod; 37, flat gear; 38, long gear; 39, toothed plate; 40, long neck screw; 41, transmission gear block; 42, conversion rod; 43, transmission gear block; 44, shift block; 45, shift rod; 46, support block; 47, torsion spring assembly. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] like Figure 1-8As shown, a speed change cam and shift plate combination for controlling a speed change mechanism provided by an embodiment of the present invention comprises a speed change cam body 1, a limit rod 12, a shift plate body 21, a torsion spring assembly 47, a transmission tooth block 41 and a transmission tooth block 43, the outer walls of both ends of the speed change cam body 1 are provided with mounting bearings 2, and the outer walls of the top and bottom of the mounting bearings 2 are provided with mounting blocks 3, the inner wall of the mounting block 3 is rotatably connected with a rotating tube 4 through a bearing, and a short rod 5 is provided on the inner wall of the mounting block 3, the rotating tube 4 is sleeved on the outside of the short rod 5, and a fixed torsion spring 6 connected to the inner wall of the rotating tube 4 is provided on the inner wall of the mounting block 3, the fixed torsion spring 6 is sleeved on the outside of the short rod 5, a rotating tube 4 is integrally connected with a rotating torque 7 at one end of the rotating tube 4 located outside the mounting block 3, and a stopper 8 is integrally connected to the outer wall of the rotating tube 4, a through groove 9 is provided on the outer wall of the top of the mounting block 3, and the stopper 8 passes through the through groove 9, the speed change cam body 1 is provided with a plurality of sliding grooves 10, and an anti-slip groove 11 is provided on the inner wall of the sliding groove 10, a shift fork 13 is slidably connected to the outside of the limit rod 12, and a connecting rod 14 is integrally connected to the outer wall of the bottom of the shift fork 13, the bottom end of the connecting rod 14 is slidably connected to the inside of the anti-slip groove 11, an auxiliary ball 16 is provided at the bottom end of the connecting rod 14, and the auxiliary ball 16 is rollingly connected to the inside of the anti-slip groove 11, an anti-slip rod 15 is provided on the outer wall of the connecting rod 14 located inside the anti-slip groove 11, and the anti-slip rod 15 is slidably connected to the inside of the anti-slip groove 11, a guide block 17 is provided on the outer wall of the limit rod 12, and a guide groove 18 is provided inside the shift fork 13, and the guide block 17 is slidably connected to the inside of the guide groove 18, grooves 19 are provided on the top and outer walls on both sides of the guide block 17, and a ball 20 is provided inside the groove 19, and the ball 20 contacts the inner wall of the guide groove 18.

[0038] The present invention provides a speed change cam and shift plate combination for controlling a speed change mechanism, comprising a speed change cam body 1, a limit rod 12, a shift plate body 21, a torsion spring assembly 47, a transmission tooth block 41 and a transmission tooth block 43, the outer walls of both ends of the speed change cam body 1 are provided with mounting bearings 2, and the outer walls of the top and bottom of the mounting bearings 2 are provided with mounting blocks 3, the inner wall of the mounting block 3 is rotatably connected with a rotating tube 4 through a bearing, and a short rod 5 is provided on the inner wall of the mounting block 3, the rotating tube 4 is sleeved on the outside of the short rod 5, and a fixed torsion spring 6 connected to the inner wall of the rotating tube 4 is provided on the inner wall of the mounting block 3, the fixed torsion spring 6 is sleeved on the outside of the short rod 5, and the rotating tube 4 is positioned at the inner wall of the mounting block 3. A turning knob 7 is integrally connected to one end of the outside of the mounting block 3, and a stopper 8 is integrally connected to the outer wall of the rotating tube 4, a through groove 9 is provided on the outer wall of the top of the mounting block 3, and the stopper 8 passes through the through groove 9, a plurality of sliding grooves 10 are provided on the outer wall of the speed change cam body 1, and an anti-slip groove 11 is provided on the inner wall of the sliding groove 10, a shift fork 13 is slidably connected to the outside of the limit rod 12, and a connecting rod 14 is integrally connected to the outer wall of the bottom of the shift fork 13, the bottom end of the connecting rod 14 is slidably connected to the inside of the anti-slip groove 11, an auxiliary bead 16 is provided at the bottom end of the connecting rod 14, and the auxiliary bead 16 is rollingly connected to the inside of the anti-slip groove 11, and the connecting rod 14 is located inside the anti-slip groove 11 An anti-drop rod 15 is arranged on the outer wall, and the anti-drop rod 15 is slidably connected to the inside of the anti-drop groove 11, a guide block 17 is arranged on the outer wall of the limit rod 12, and a guide groove 18 is provided inside the fork 13, and the guide block 17 is slidably connected to the inside of the guide groove 18, grooves 19 are provided on the top and the outer walls on both sides of the guide block 17, and balls 20 are arranged inside the grooves 19, and the balls 20 are in contact with the inner walls of the guide grooves 18, and the rotating knob 7 is rotated to drive the rotating tube 4 and the block 8 to rotate, so that the block 8 rotates to the inside of the mounting block 3, and the speed change cam body 1 is placed inside the gearbox, and the mounting bearing 2 and the mounting block 3 are clamped on the speed change cam reserved for the gearbox. Inside the mounting hole where the wheel body 1 is installed, loosen the torque 7, and the torsion force of the fixed torsion spring 6 will drive the rotating tube 4 and the block 8 to rotate, so that the block 8 protrudes from the inside of the through groove 9. At this time, the block 8 will be clamped in the reserved mounting hole for fixing the speed cam body 1. This method makes both ends of the speed cam body 1 rotationally connected to the mounting hole fixed to the speed cam body 1 through the mounting bearing 2, thereby avoiding the speed cam body 1 and the mounting hole from becoming a non-circular shape after being worn for a long time, and the speed cam body 1 may cause the rotation offset of the mounting hole when the speed cam body 1 rotates, which may cause the speed cam to move.

[0039] A plurality of shifting rods 45 are arranged on the outer wall of one side of the shifting plate body 21 . A replacement barrel 22 is arranged on the outer wall of one side of the shifting plate body 21 and is inserted into the interior of the speed change cam body 1 . The replacement barrel 22 is used to fix the shifting plate body 21 .

[0040] In this embodiment, the interior of the replacement cylinder 22 is slidably connected with a moving block 23, and an insert block 24 is provided on the outer wall of the moving block 23. A slot 25 is opened on the inner wall of the speed change cam body 1, and the insert block 24 is inserted into the interior of the slot 25. A spring 26 connected to the moving block 23 is provided on the inner wall of the replacement cylinder 22, and the elastic force of the spring 26 can pull the moving block 23 and the insert block 24 back.

[0041] In the embodiment of the present invention, a supporting block 27 is slidably connected inside the replacement cylinder 22 , and the supporting block 27 is supported by the moving block 23 . When the supporting block 27 is squeezed by the squeezing block 29 , it will move to squeeze the moving block 23 .

[0042] In one embodiment provided by the present invention, an extrusion screw 28 is threadedly inserted into the outer wall of the top of the replacement cylinder 22, and an extrusion block 29 is provided on the outer wall of the extrusion screw 28 located inside the replacement cylinder 22. The extrusion block 29 contacts the outer wall of the supporting block 27. Rotating the extrusion screw 28 can drive the extrusion block 29 to move and squeeze the supporting block 27.

[0043] Specifically, the torsion spring assembly 47 includes a torsion spring seat 30 and a support block 46. A stop block 31 is rotatably connected to the outer wall of one side of the support block 46 through a bearing, and the outer walls on both sides of the support block 46 are movably connected to side plates 33 through hinges. A stop torsion spring 32 connected to the side plate 33 is provided on the outer wall of the stop block 31, and the stop torsion spring 32 is sleeved inside the stop block 31.

[0044] In the present invention, a fixing block 34 is provided on the outer wall of the side plate 33, and the fixing block 34 is inserted into the interior of the torsion spring seat 30. A rack 35 is slidably connected to the interior of the torsion spring seat 30, and the rack 35 is inserted into the interior of the fixing block 34, so as to fix the side plate 33.

[0045] In the embodiment provided by the present invention, a rotating rod 36 is rotatably connected to the inner wall of the torsion spring seat 30 through a bearing, and a flat gear 37 and a long gear 38 are respectively provided on the outer wall of the rotating rod 36, the long gear 38 is meshed with the rack 35, and a toothed plate 39 is slidably connected to the inside of the torsion spring seat 30, and the toothed plate 39 is meshed with the flat gear 37, a long neck screw 40 is threadedly inserted on the outer wall of one side of the torsion spring seat 30, and one end of the long neck screw 40 located inside the torsion spring seat 30 is rotatably connected to the outer wall of the toothed plate 39 through a bearing, and rotating the long neck screw 40 can drive the toothed plate 39 to move and mesh with the flat gear 37 so that the flat gear 37 drives the rotating rod 36 to rotate.

[0046] In the embodiment provided by the present invention, a change rod 42 is provided on the inner wall of the transmission gear block 41, and a shift block 44 is provided on the outer wall of one side of the transmission gear block 43. When the transmission gear block 41 rotates, it engages with the transmission gear block 43 to drive the transmission gear block 43 and the shift block 44 to rotate.

[0047] A speed changing method for controlling a speed changing mechanism comprises the following speed changing steps:

[0048] S1: When it is necessary to change the speed, the change lever 42 is stepped on and rotated downward, the change lever 42 will drive the transmission gear block 41 and the transmission gear block 43 to rotate, the transmission gear block 43 will drive the shift block 44 to rotate and the shift lever 45 to rotate, the shift lever 45 will drive the shift plate body 21 to rotate, the shift plate body 21 will drive the speed change cam body 1 to rotate, because the shift fork 13 is sleeved on the outside of the limit rod 12, when the speed change cam body 1 rotates, the bottom end of the connecting rod 14 will slide inside the sliding groove 10, because the sliding groove 10 is curved, when the connecting rod 14 slides, it will drive the shift fork 13 to slide outside the limit rod 12, and the shift fork 13 will push the free gear on the speed change gear of the speed change mechanism to move to achieve gear shifting;

[0049] S2: When the transmission gear block 43 is not engaged with the transmission gear block 41, the torsional force of the stop torsion spring 32 will drive the stop block 31 to rotate, and the stop block 31 will abut against the groove 19 of the shift plate body 21 to fix the shift plate body 21 and prevent the shift plate body 21 from rotating, thereby completing the speed change.

[0050] Working principle: Place the speed change cam body 1 inside the gearbox, turn the knob 7 to drive the rotating tube 4 and the block 8 to rotate, so that the block 8 rotates to the inside of the mounting block 3, and clamp the mounting bearing 2 and the mounting block 3 into the mounting hole reserved for the speed change cam body 1 in the gearbox, loosen the knob 7, and the torsional force of the fixed torsion spring 6 will drive the rotating tube 4 and the block 8 to rotate, so that the block 8 protrudes from the inside of the through groove 9, so that the block 8 is clamped into the mounting hole fixed to the speed change cam body 1. This method makes both ends of the speed change cam body 1 rotationally connected to the mounting hole fixed to the speed change cam body 1 through the mounting bearing 2, thereby avoiding the speed change cam body 1 and the mounting hole from becoming a non-circular shape after the speed change cam body 1 and the mounting hole are worn for a long time. , so that the speed cam body 1 may be shifted due to the rotation offset when the mounting hole rotates, and then the torsion spring seat 30 is installed inside the gearbox, and the change rod 42 and the transmission gear block 43 are both connected to the transmission box for rotation. When shifting, the change rod 42 is stepped on and rotated downward, and the change rod 42 will drive the transmission gear block 41 to rotate and the transmission gear block 43 to rotate, and the transmission gear block 43 will drive the shift block 44 to rotate and the shift lever 45 to rotate, and the shift lever 45 will drive the shift plate body 21 to rotate, and the shift plate body 21 will drive the speed cam body 1 to rotate. Because the shift fork 13 is sleeved on the outside of the limit rod 12, when the speed cam body 1 rotates, the bottom end of the connecting rod 14 will slide inside the sliding groove 10. Because the sliding groove 10 is curved, the connecting rod 14 When sliding, the shift fork 13 will be driven to slide on the outside of the limit rod 12, and the shift fork 13 will push the free gear on the speed gear of the speed change mechanism to move to achieve gear shifting. After the gear shifting is completed, the transmission tooth block 41 is no longer engaged with the transmission tooth block 43, and the torsional force of the stop torsion spring 32 will drive the stop block 31 to rotate, and the stop block 31 will abut against the groove 19 of the shift plate body 21, fix the shift plate body 21, and prevent the shift plate body 21 from rotating to complete the speed change. After long-term use, the torsion force of the stop torsion spring 32 will weaken and the shift plate body 21 will not be able to stop. Turning the long neck screw 40 drives the tooth plate 39 to move and rotate the flat gear 37. The flat gear 37 drives the rotating rod 36 and the long gear 38 to rotate so that the long gear 38 is engaged with the rack 35, which can make the rack 35 move from the fixed The interior of the fixed block 34 can be moved out, and the support block 46 and the side plate 33 can be removed from the torsion spring seat 30. When the torsion force of the stop torsion spring 32 is insufficient, the stop torsion spring 32 can be replaced, which can avoid the situation where the torsion force of the stop torsion spring 32 is insufficient and the stop block 31 cannot stop the shift plate body 21. When the shift plate body 21 or the shift rod 45 is damaged, the extrusion screw 28 is rotated to drive the extrusion block 29 to move. At this time, the supporting block 27 is not squeezed by the extrusion block 29. The elastic force of the spring 26 will push the moving block 23 and the insert block 24 to move so that the insert block 24 is moved out of the slot 25, and the shift plate body 21 is pulled toward the outside of the speed change cam body 1. The shift plate body 21 can be removed from the speed change cam body 1 and can be replaced when the shift plate body 21 or the shift rod 45 is damaged.

[0051] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A speed change cam and shift plate combination for controlling a speed change mechanism, comprising a speed change cam body (1), a limit rod (12), a shift plate body (21), a torsion spring assembly (47), a transmission tooth block (41) and a transmission tooth block (43), characterized in that: The outer walls of both ends of the speed change cam body (1) are provided with mounting bearings (2), and the outer walls of the top and bottom of the mounting bearings (2) are provided with mounting blocks (3), the inner wall of the mounting block (3) is rotatably connected to a rotating tube (4) via a bearing, and a short rod (5) is provided on the inner wall of the mounting block (3), the rotating tube (4) is sleeved on the outside of the short rod (5), and a fixed torsion spring (6) connected to the inner wall of the rotating tube (4) is provided on the inner wall of the mounting block (3), and the fixed The fixed torsion spring (6) is sleeved on the outside of the short rod (5); one end of the rotating tube (4) located outside the mounting block (3) is integrally connected with a rotating torsion (7); and a stopper (8) is integrally connected to the outer wall of the rotating tube (4); a through groove (9) is provided on the outer wall of the top of the mounting block (3); and the stopper (8) passes through the through groove (9); a plurality of sliding grooves (10) are provided on the outer wall of the speed change cam body (1); and an anti-slip groove (11) is provided on the inner wall of the sliding groove (10). The outer portion of the limit rod (12) is slidably connected to a shift fork (13), and a connecting rod (14) is integrally connected to the outer wall of the bottom of the shift fork (13), the bottom end of the connecting rod (14) is slidably connected to the inside of the anti-slip groove (11), an auxiliary bead (16) is provided at the bottom end of the connecting rod (14), and the auxiliary bead (16) is rollingly connected to the inside of the anti-slip groove (11), and an anti-slip rod (15) is provided on the outer wall of the connecting rod (14) located inside the anti-slip groove (11), and the anti-slip rod (15) is slidably connected inside the anti-slip groove (11), a guide block (17) is provided on the outer wall of the limit rod (12), and a guide groove (18) is provided inside the shift fork (13), the guide block (17) is slidably connected inside the guide groove (18), a groove (19) is provided on the top and the outer walls on both sides of the guide block (17), and a ball (20) is provided inside the groove (19), and the ball (20) is in contact with the inner wall of the guide groove (18); A plurality of shifting rods (45) are arranged on the outer wall of one side of the shifting plate body (21), a replacement cylinder (22) is arranged on the outer wall of one side of the shifting plate body (21), and the replacement cylinder (22) is inserted into the interior of the speed change cam body (1); The interior of the replacement cylinder (22) is slidably connected to a moving block (23), and an insert block (24) is provided on the outer wall of the moving block (23); a slot (25) is provided on the inner wall of the speed change cam body (1), and the insert block (24) is inserted into the slot (25); and a spring (26) connected to the moving block (23) is provided on the inner wall of the replacement cylinder (22); The torsion spring assembly (47) comprises a torsion spring seat (30) and a support block (46); a stop block (31) is rotatably connected to an outer wall of one side of the support block (46) via a bearing, and side plates (33) are movably connected to the outer walls of both sides of the support block (46) via hinges; a stop torsion spring (32) connected to the side plate (33) is arranged on the outer wall of the stop block (31), and the stop torsion spring (32) is sleeved inside the stop block (31); A fixing block (34) is provided on the outer wall of the side plate (33), and the fixing block (34) is inserted into the interior of the torsion spring seat (30); a rack (35) is slidably connected to the interior of the torsion spring seat (30), and the rack (35) is inserted into the interior of the fixing block (34); A rotating rod (36) is rotatably connected to the inner wall of the torsion spring seat (30) via a bearing, and a flat gear (37) and a long gear (38) are respectively arranged on the outer wall of the rotating rod (36), and the long gear (38) and the rack (35) are meshed with each other. A toothed plate (39) is slidably connected to the interior of the torsion spring seat (30), and the toothed plate (39) and the flat gear (37) are meshed with each other. A long-necked screw (40) is threadedly inserted on the outer wall of one side of the torsion spring seat (30), and one end of the long-necked screw (40) located inside the torsion spring seat (30) is rotatably connected to the outer wall of the toothed plate (39) via a bearing.

2. A speed change cam and shift plate combination for controlling a speed change mechanism according to claim 1, characterized in that: A supporting block (27) is slidably connected inside the replacement cylinder (22), and the supporting block (27) is supported by the moving block (23).

3. A speed change cam and shift plate combination for controlling a speed change mechanism according to claim 2, characterized in that: An extrusion screw (28) is threadedly inserted into the outer wall of the top of the replacement cylinder (22), and an extrusion block (29) is provided on the outer wall of the extrusion screw (28) located inside the replacement cylinder (22), and the extrusion block (29) contacts the outer wall of the supporting block (27).

4. A speed change cam and shift plate combination for controlling a speed change mechanism according to claim 1, characterized in that: A change rod (42) is provided on the inner wall of the transmission gear block (41), and a shift block (44) is provided on the outer wall of one side of the transmission gear block (43).

5. A speed-changing method for controlling a speed-changing mechanism, comprising a speed-changing cam and a shift plate combination for controlling a speed-changing mechanism as claimed in any one of claims 1 to 4, characterized in that: The speed change steps include: S1: When a gear shift is required, the shift lever (42) is stepped on and rotated downward, and the shift lever (42) drives the transmission gear block (41) and the transmission gear block (43) to rotate, and the transmission gear block (43) drives the shift block (44) to rotate and drives the shift lever (45) to rotate, and the shift lever (45) drives the shift plate body (21) to rotate, and the shift plate body (21) drives the speed change cam body (1) to rotate. Because the shift fork (13) is sleeved on the outside of the limit rod (12), when the speed change cam body (1) rotates, the bottom end of the connecting rod (14) slides inside the sliding groove (10). Because the sliding groove (10) is curved, when the connecting rod (14) slides, it drives the shift fork (13) to slide outside the limit rod (12), and the shift fork (13) pushes the free gear on the speed change gear of the speed change mechanism to move to achieve gear shifting; S2: When the transmission gear block (43) is not engaged with the transmission gear block (41), the torsion force of the stop torsion spring (32) drives the stop block (31) to rotate, and the stop block (31) abuts against the groove of the shift plate body (21), fixing the shift plate body (21) and preventing the shift plate body (21) from rotating, thereby completing the speed change.

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