Primary clutch, crankshaft, automatic clutch engine and motorcycle

Abstract

The invention relates to the field of automobile or motorcycle engines, in particular to a primary clutch, a crankshaft, an automatic clutch engine and a motorcycle. The primary clutch comprises an outer cover (11), a sliding sleeve (12) is connected to the outer cover (11) in a sliding mode, and a connecting protrusion (13) is arranged at the end, away from the outer cover (11), of the sliding sleeve (12). Compared with the prior art, the engine has the advantages of being simple in structure, convenient to operate, high in adaptability, good in manufacturability, stable, reliable and low in manufacturing cost, the engine performance and the power output continuity can be greatly improved only through small modification, and the large actual popularization value is achieved.

Description

Technical Field

[0001] The invention relates to the field of automobile or motorcycle engines, in particular to a primary clutch, a crankshaft, an automatic clutch engine and a motorcycle. Background Art

[0002] There are two main types of motorcycle clutches: one is a wet multi-plate clutch (usually installed on the engine transmission input shaft), which compresses or releases the clutch spring through the operating mechanism to achieve the separation or combination of the clutch friction plate, which usually requires manual operation. Most of our common straddle motorcycles use this structure. The other is called a centrifugal shoe clutch (usually installed on the engine crankshaft), which does not require manual operation. When the engine speed increases, the clutch shoe overcomes the spring tension under the action of centrifugal force and combines with the clutch cover to achieve power transmission; when the engine speed decreases, the clutch shoe overcomes the centrifugal force under the action of the tension spring and separates from the clutch cover, cutting off power transmission. Most of our common curved beam motorcycles use this structure.

[0003] The above two types of clutches have their own advantages and disadvantages during use. The wet multi-plate clutch uses multiple friction plates to transmit power under the pressure of multiple sets of springs, so by adjusting the number of friction plates and springs, stable power output can be achieved and it is not easy to slip. Its disadvantage is that it requires high operation from the rider, and the rider needs to manually control the clutch to coordinate the gear shifting, which is easy to stall when the operation is improper.

[0004] Since the centrifugal shoe clutch automatically engages and disengages according to the centrifugal force generated by the rotational speed, it is easy to operate and will not cause the engine to stall. Its disadvantage is that the shoe is prone to continuous slippage and overheating under heavy load and low speed conditions, which will burn the shoe friction material. In addition, since its engagement and disengagement are determined by the rotational speed, it is impossible to shift gears when the speed is high. To solve this problem, the centrifugal shoe clutch is usually used in combination with a wet multi-plate clutch. This type of structure is called a dual-clutch structure. Motorcycle engines with a dual-clutch structure have the advantages of simple operation and the engine is not easy to stall. However, under low-speed and heavy-load conditions (such as heavy-load climbing), the friction between the shoe and the outer cover is insufficient to withstand the vehicle's driving resistance. The shoe and the outer cover are prone to slipping, resulting in discontinuous engine output power or burning of the shoe friction material.

[0005] Therefore those skilled in the art are devoted to developing a primary clutch, a crankshaft, an automatic clutch engine and a motorcycle. Summary of the invention

[0006] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a primary clutch, a crankshaft, an automatic clutch engine and a motorcycle.

[0007] To achieve the above object, the present invention provides a primary clutch, comprising an outer cover, a sliding sleeve being slidably connected to the outer cover, and a connecting protrusion being provided at one end of the sliding sleeve away from the outer cover.

[0008] Preferably, a radially extending fork groove is provided on the outer side wall of the sliding sleeve, a shifter claw is provided in the fork groove, and the shifter claw is rotatably connected to the sliding sleeve. The fork groove provides a mounting base for the shifter claw, and the shifter claw is used to push the sliding sleeve to slide.

[0009] Preferably, the end of the pusher claw away from the sliding sleeve is slidably connected to a sliding rod, the sliding rod is provided with an annular rib, the annular rib is provided with an elastic connector, one end of the elastic connector is connected to the annular rib, and the other end is connected to the pusher claw. The annular rib provides a mounting base for the elastic connector, and the pusher claw is pushed to move by the elastic deformation of the elastic connector.

[0010] Preferably, at least one group of pin holes is provided on the sliding sleeve, a pin hole sleeve is provided outside the pin hole, a centrifugal pin is provided on the pin hole sleeve, and the centrifugal pin is slidably matched with the pin hole.

[0011] Preferably, the pin hole sleeve is provided with an elastic support member, one end of the elastic support member is connected to the pin hole sleeve, and the other end is connected to the centrifugal pin, and when the elastic support member is at a free length, one end of the centrifugal pin extends out of the pin hole; the outer cover is provided with a radially extending limit groove, and the limit groove cooperates with the end of the centrifugal pin extending out of the pin hole.

[0012] Preferably, the outer wall of the sliding sleeve is provided with primary driving teeth, which are mainly responsible for meshing transmission.

[0013] The present invention also provides a crankshaft, comprising a crankshaft body, a shaft sleeve is arranged on the crankshaft body, and a connecting groove is arranged at one end of the shaft sleeve. The connecting groove mainly plays a connecting transmission role.

[0014] The present invention also provides an automatic clutch engine, comprising any of the above primary clutches and the above crankshaft, wherein the connecting protrusion cooperates with the connecting groove, and the connecting groove and the connecting protrusion are engaged with each other to transmit the power of the crankshaft body directly to the sliding sleeve over the outer cover.

[0015] Preferably, the invention further comprises a secondary clutch, wherein the secondary clutch is provided with secondary driven teeth, the primary driving teeth mesh with the secondary driven teeth, and the power of the primary clutch is transmitted to the secondary clutch through the meshing of the primary driving gear and the secondary driven gear.

[0016] The present invention also provides a motorcycle, comprising any of the primary clutches as described above or the crankshaft as described above or any of the automatic clutch engines as described above.

[0017] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention has the advantages of simple structure, convenient operation and strong adaptability, and the present invention has good processability, stability and reliability, and low manufacturing cost. Only minor modifications are required to greatly improve the engine performance and the continuity of power output, and it has great practical promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an outer cover in a specific embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of a sliding sleeve in a specific implementation manner of the present invention.

[0020] Figure 3 It is a schematic diagram of the assembly of the outer cover and the sliding sleeve in a specific implementation manner of the present invention.

[0021] Figure 4 It is a schematic diagram of the assembly of a crankshaft body and a sleeve in a specific implementation manner of the present invention.

[0022] Figure 5 It is a schematic diagram of the assembly of the outer cover and the pusher claw in a specific implementation manner of the present invention.

[0023] Figure 6 1 is a front view of the outer cover in one embodiment of the present invention.

[0024] Figure 7 yes Figure 6 Schematic diagram of the cross-section structure of AA.

[0025] Figure 8 yes Figure 7 A magnified schematic diagram of the structure at point B in the middle.

[0026] Fig. 9 It is a schematic diagram of the assembly of a crankshaft and an outer cover in a specific embodiment of the present invention.

[0027] Fig.10 It is a schematic diagram of overall assembly in a specific implementation manner of the present invention.

[0028] 11. Outer cover; 12. Sliding sleeve; 121. Fork groove; 122. Pin hole; 122a. Elastic support member; 122b. Centrifugal pin; 122c. Pin hole sleeve; 123. Limiting groove; 124. Primary driving tooth; 13. Connecting protrusion; 21. Shifter claw; 22. Sliding rod; 23. Annular rib; 24. Elastic connecting member; 31. Crankshaft body; 32. Bushing; 33. Connecting groove; 41. Secondary clutch; 42. Secondary driven tooth. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific manner, and therefore cannot be understood as limiting the present invention. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] like Figure 1-3 As shown, a primary clutch includes an outer cover 11, on which a sleeve 12 is slidably connected as a mounting base. In this embodiment, the sliding connection is achieved by splines. Specifically, an outer cover 11 is provided with an external spline, and an inner spline corresponding to the external spline is provided on the inner side wall of the sleeve 12. While the internal and external splines cooperate with each other for transmission, the sleeve 12 can also slide back and forth on the outer cover 11.

[0031] In this embodiment, primary driving teeth 124 are provided on the outer wall of the sliding sleeve 12 . The primary driving teeth 124 are straight teeth and are mainly responsible for meshing transmission.

[0032] A connecting protrusion 13 is provided at one end of the sliding sleeve 12 away from the outer cover 11. In this embodiment, the connecting protrusion 13 is arc-shaped, distributed along the circumference of the sliding sleeve 12 and extending along its axis, and mainly plays a connecting and transmission role.

[0033] like Figure 4 As shown, the present invention also provides a crankshaft, including a crankshaft body 31, which is connected to a crankcase (not shown in the figure) and is responsible for receiving and transmitting power. A shaft sleeve 32 is provided on the crankshaft body 31. In this embodiment, the shaft sleeve 32 is sleeved outside the crankshaft and has an interference fit with the crankshaft. In other embodiments, the two can also be connected by a spline.

[0034] A connecting groove 33 is provided at one end of the sleeve 32. In this embodiment, the connecting groove 33 is arc-shaped and distributed along the circumference of the sleeve 12. The connecting groove 33 and the connecting protrusion 13 are mutually engaged to directly transmit the power of the crankshaft body 31 to the sleeve 12 via the outer cover 11.

[0035] like Figure 5As shown, a radially extending fork groove 121 is provided on the outer wall of the sliding sleeve 12, and a shifting claw 21 is rotatably connected in the fork groove 121. The shifting claw 21 provides a mounting base for the shifting claw 21, and the shifting claw 21 is used to push the sliding sleeve 12 to slide. The shifting claw 21 is slidably connected to a sliding rod 22 on the side away from the sliding sleeve 12. In this embodiment, the sliding connection is a clearance fit. A radially extending annular rib 23 is provided on the sliding rod 22, and an elastic connecting member 24 is provided on the annular rib 23. In this embodiment, the elastic connecting member 24 is a spring, and the spring sleeve is arranged outside the sliding rod 22. The annular rib 23 provides a mounting base for the elastic connecting member 24. One end of the elastic connecting member 24 is connected to the annular rib 23, and the other end is connected to the shifting claw 21. When in use, the slide bar 22 is pushed to compress the elastic connector 24, and the elastic connector 24 stores energy through elastic deformation. When the connection protrusion 13 on the slide sleeve 12 is aligned with the connection groove 33 on the shaft sleeve 32, the elastic connector 24 elastically recovers to push the pusher claw 21 to move, and the pusher claw 21 pushes the slide sleeve 12 to move synchronously and engage with the shaft sleeve 32. This design reduces the operating difficulty of the user, and the automatic connection between the slide sleeve 12 and the shaft sleeve 32 can be achieved by only operating the slide bar 22 in advance to compress the elastic connector 24.

[0036] like Figure 6-8 As shown, at least one group of pin holes 122 is provided on the sliding sleeve 12. In this embodiment, the pin holes 122 are through holes, and a total of four groups are provided. In other embodiments, other numbers of pin holes 122 may be provided according to circumstances. A pin hole sleeve 122c is provided on the outer sleeve of the pin hole 122, and a centrifugal pin 122b is provided on the pin hole sleeve 122c. The centrifugal pin 122b is cylindrical, and its length is less than or equal to the depth of the pin hole 122. The centrifugal pin 122b is in sliding cooperation with the pin hole 122. In this embodiment, the sliding cooperation is a clearance cooperation. The end of the centrifugal pin 122b can slide out of the pin hole 122.

[0037] In this embodiment, the outer cover 11 is provided with a radially extending limiting groove 123, which cooperates with one end of the centrifugal pin 122b extending out of the pin hole 122, and the locking or unlocking of the sliding sleeve 12 and the outer cover 11 is achieved by the mutual engagement of the centrifugal pin 122b and the limiting groove 123. Specifically, when the end of the centrifugal pin 122b is inserted into the limiting groove 123, the sliding sleeve 12 and the outer cover 11 are in a locked state; conversely, when the end of the centrifugal pin 122b is separated from the limiting groove 123, the two are unlocked.

[0038] In order to realize the above functions, an elastic support member 122a is provided on the pin hole sleeve 122c, one end of the elastic support member 122a is connected to the pin hole sleeve 122c, and the other end is connected to the centrifugal pin 122b. In this embodiment, the elastic support member 122a is a spring, and other similar products such as spring washers or spring snap rings can also be used instead in other embodiments. When the elastic support member 122a is at a free length, the centrifugal pin 122b extends into the limit groove 123 at the supporting lower end of the elastic support member 122a for limit, and the sleeve 12 and the outer cover 11 are in a locked state at this time; as the rotation speed of the outer cover 11 and the sleeve 12 increases, the centrifugal pin 122b compresses the elastic support member 122a under the action of centrifugal force and escapes from the limit groove 123, and the outer cover 11 and the sleeve 12 are in an unlocked state.

[0039] In other embodiments, the elastic support member 122a may be eliminated, and at least four pin holes 122 may be arranged at intervals on the sleeve 12, and centrifugal pins 122b are provided in the four pin holes 122. When in use, at least one of the four pin holes 122 arranged at intervals is located above the sleeve 12, and the centrifugal pin 122b located in the pin hole 122 above the sleeve 12 is pulled by gravity and the lower end is inserted into the limit groove 123 to achieve the locking operation. As the rotation speed of the outer cover 11 and the sleeve 12 increases, the end of the centrifugal pin 122b slides out of the limit groove 123 under the action of centrifugal force and is unlocked.

[0040] The centrifugal pin 122 b is provided to lock or unlock the outer cover 11 and the sliding sleeve 12 , so as to prevent the sliding sleeve 12 and the shaft sleeve 32 from being forcibly engaged and damaging the connecting protrusion 13 or the connecting groove 33 when there is a large speed difference.

[0041] like Figure 9-10 As shown, the present invention also provides an automatic clutch engine, including any of the primary clutch and crankshaft as described above, and also including a secondary clutch 41. In this embodiment, the secondary clutch 41 is a wet multi-plate clutch, and other clutches of the same type such as a dry multi-plate clutch and a single-plate spring clutch may also be used in other embodiments. The secondary clutch 41 is provided with a secondary driven tooth 42, and the primary driving tooth 124 is always meshed with the secondary driven tooth 42, and the two are meshed to transmit the power of the primary clutch to the secondary clutch 41.

[0042] The present invention also provides a motorcycle, comprising any of the primary clutches as described above or the crankshaft as described above or any of the automatic clutch engines as described above.

[0043] When the present application is used under normal working conditions, the crankshaft body 31 directly drives the shoe assembly (not shown in the figure) in the outer cover 11 to rotate, but the centrifugal force of the shoe assembly in the initial state is not enough to overcome the tension of the shoe spring, and the shoe assembly is not combined with the outer cover 11. As the rotation speed of the crankshaft body 31 increases, the centrifugal force of the shoe assembly overcomes the tension of the shoe spring and combines with the outer cover 11. The crankshaft body 31 drives the outer cover 11 to rotate through the shoe assembly, and the outer cover 11 drives the sleeve 12 to rotate synchronously through the spline. The primary driving teeth 124 provided on the outer wall of the sleeve 12 mesh with the secondary driven teeth 42 to drive the secondary clutch 41 to rotate, and the power of the crankshaft body 31 is transmitted to the secondary clutch 41.

[0044] When the present application is in low-speed and heavy-load conditions, the sliding sleeve 12 can be pushed to translate by operating the pusher claw 21, so that the connecting protrusion 13 and the connecting groove 33 are mutually engaged, and the crankshaft body 31 outputs power directly to the sliding sleeve 12 over the outer cover 11, thereby reducing the occurrence of slipping and burning accidents between the shoe assembly and the outer cover 11, and improving the continuity of the engine power output. In addition, the present application has a simple structure and only requires minor changes to significantly improve the engine performance, and has great practical promotion value.

[0045] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A primary clutch, characterized in that: It comprises an outer cover (11), a sliding sleeve (12) is slidably connected to the outer cover (11), and a connecting protrusion (13) is provided at one end of the sliding sleeve (12) away from the outer cover (11).

2. The primary clutch according to claim 1, characterized in that: A radially extending shift fork groove (121) is provided on the outer side wall of the sliding sleeve (12), a shift fork groove (121) is provided in the shift fork groove (121), and the shift fork groove (21) is rotatably connected to the sliding sleeve (12).

3. The primary clutch according to claim 2, characterized in that: The end of the pusher claw (21) away from the sliding sleeve (12) is slidably connected to a sliding rod (22), an annular rib (23) is provided on the sliding rod (22), an elastic connecting piece (24) is provided on the annular rib (23), one end of the elastic connecting piece (24) is connected to the annular rib (23), and the other end is connected to the pusher claw (21).

4. The primary clutch according to claim 1, characterized in that: The sliding sleeve (12) is provided with at least one group of pin holes (122), the pin holes (122) are provided with pin hole sleeves (122c) outside, the pin hole sleeves (122c) are provided with centrifugal pins (122b), and the centrifugal pins (122b) are slidably matched with the pin holes (122).

5. The primary clutch according to claim 4, characterized in that: An elastic support member (122a) is provided on the pin hole sleeve (122c), one end of the elastic support member (122a) is connected to the pin hole sleeve (122c), and the other end is connected to the centrifugal pin (122b), and when the elastic support member (122a) is at a free length, one end of the centrifugal pin (122b) extends out of the pin hole (122); The outer cover (11) is provided with a radially extending limiting groove (123), and the limiting groove (123) cooperates with an end of the centrifugal pin (122b) extending outside the pin hole (122).

6. The primary clutch according to claim 1, characterized in that: The outer side wall of the sliding sleeve (12) is provided with primary driving teeth (124).

7. A crankshaft, characterized in that: It comprises a crankshaft body (31), a shaft sleeve (32) is provided on the crankshaft body (31), and a connecting groove (33) is provided at one end of the shaft sleeve (32).

8. An automatic clutch engine, comprising the primary clutch according to any one of claims 1 to 6 and the crankshaft according to claim 7, characterized in that: The connecting protrusion (13) and the connecting groove (33) cooperate with each other.

9. The automatic clutch engine according to claim 8, characterized in that: It also includes a secondary clutch (41), on which a secondary driven tooth (42) is provided, and the primary driving tooth (124) meshes with the secondary driven tooth (42).

10. A motorcycle, characterized in that: It comprises a primary clutch as described in any one of claims 1-6 or a crankshaft as described in claim 7 or an automatic clutch engine as described in any one of claims 8-9.

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