Clutch and driving device using same

Abstract

The utility model relates to a clutch and a driving device using the same. The clutch comprises a first component (51), a second component (61) and a C-shaped elastic piece (71), wherein the first component (51) and the second component (61) can rotate relatively. The first component (51) comprises an accommodating cavity (53), and the second component (61) is at least partially accommodated in the accommodating cavity (53). The C-shaped elastic piece (71) surrounds the second component (61), friction connection is formed between the C-shaped elastic piece (71) and the second component (61), one end of the C-shaped elastic piece (71) is provided with a first protruding portion (73a), the inner wall of the containing cavity (53) is provided with a first driving block (53a), and when the first component (51) rotates relative to the second component (61) in the first rotating direction, the first driving block (53a) can push the first protruding portion (73a) towards an opening of the C-shaped elastic piece (71) to drive the first component (51) to rotate relative to the second component (61) in the first rotating direction. And the C-shaped elastic piece (71) is subjected to acting force in the diameter reducing direction. The friction force between the C-shaped elastic piece and the second component of the clutch can be increased, and the reliability and friction torque of the clutch are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of clutch and the driving device of application this kind of clutch, this kind of driving device can be used for but not limited to driving the charging port cover plate of new energy vehicle. BACKGROUND

[0002] The utility model discloses a kind of clutch, the clutch is transmitted power by the friction force of C-shaped clamp spring, and overload protection is realized.The reliability and service life of the clutch are not good enough, after using for a certain period of time, C-shaped clamp spring is prone to deformation to reduce friction force;When the component surrounded by C-shaped clamp spring is plastic piece, it is prone to reduce friction force due to wear and tear.Therefore, an improved scheme is urgently needed. UTILITY MODEL CONTENT

[0003] One object of the present application is to improve the reliability of the clutch.

[0004] To this end, the utility model provides a kind of clutch in the first aspect, including relatively rotatable first component and second component, the first component includes accommodating cavity, and the second component is at least partially accommodated in the accommodating cavity;The clutch further includes C-shaped elastic member that is accommodated in the accommodating cavity, the C-shaped elastic member surrounds the second component and forms friction connection between the two, one end of the C-shaped elastic member is provided with first protruding part;The inner wall of the accommodating cavity is provided with first driving block, when the first component is rotated relative to the second component along first rotation direction, the first driving block can push the first protruding part towards the opening of the C-shaped elastic member, so that the C-shaped elastic member is subjected to the force in the direction of reducing diameter.

[0005] In an embodiment of the utility model, the other end of the C-shaped elastic member is provided with second protruding part, and the inner wall of the accommodating cavity is further provided with second driving block;When the first component is rotated relative to the second component along second rotation direction, the second driving block can push the second protruding part towards the opening of the C-shaped elastic member, so that the C-shaped elastic member is subjected to the force in the direction of reducing diameter;The second rotation direction is opposite to the first rotation direction.

[0006] In an embodiment of the utility model, the first driving block is located at the side of the first protruding part away from the opening of the C-shaped elastic member, and the second driving block is located at the side of the second protruding part away from the opening of the C-shaped elastic member;The distance between the first driving block and the second driving block is greater than or equal to the distance between the first protruding part and the second protruding part, so as to facilitate the installation of the C-shaped elastic member.

[0007] In one embodiment of the utility model, the accommodating cavity inner wall still is equipped with limiting block, limiting block is located between first drive block and second drive block, and is located position away from the opening of C-shaped elastic part.

[0008] In one embodiment of the utility model, the second component includes outwardly extending flange, the flange covers the opening of the accommodating cavity.

[0009] In one embodiment of the utility model, the accommodating cavity has a bottom, the first drive block and the second drive block are connected to or close to the bottom, and the axial dimension of the first drive block and the second drive block is substantially the same as the axial height of the C-shaped elastic part.

[0010] In one embodiment of the utility model, the accommodating cavity has a bottom, the first drive block and the second drive block are connected to or close to the bottom, and the axial dimension of the first drive block and the second drive block is greater than the axial height of the C-shaped elastic part.

[0011] In one embodiment of the utility model, the bottom of the accommodating cavity is provided with a circular positioning groove, the second component includes a ring body part, and the ring body part is accommodated into the positioning groove; the C-shaped elastic part surrounds the ring body part and is located above the positioning groove.

[0012] In one embodiment of the utility model, the bottom of the accommodating cavity is provided with a circular positioning groove, the second component includes a ring body part, and the ring body part is accommodated into the positioning groove; the C-shaped elastic part surrounds the ring body part and is located above the positioning groove.

[0013] In one embodiment of the utility model, the second component includes the ring body part and a gear body detachably sleeved to the ring body part, and the ring body part and the gear body are synchronously rotated through a limiting structure.

[0014] In one embodiment of the utility model, the limiting structure is a non-circular plug-in structure.

[0015] In one embodiment of the utility model, the limiting structure includes a first straight thread arranged to the outer surface of the ring body part, a second straight thread arranged to the inner hole surface of the gear body, and the second straight thread and the first straight thread are engaged.

[0016] In one embodiment of the utility model, the first component forms a first gear, the second component forms a second pinion, and the first gear and the second pinion are coaxially connected.

[0017] In an embodiment of the utility model, the ring body part is integrally formed from stainless steel material, the C-shaped elastic member and the first convex part and the second convex part are integrally formed from stainless steel sheet.

[0018] The utility model discloses a second aspect, provide a kind of drive device, including motor and external output end, further include the clutch as described above, the clutch is connected between the motor and external output end;One of the first component and second component can receive the drive of the motor, the other of the first component and second component can drive the external output end.

[0019] In an embodiment of the utility model, further include the reduction gear train for the output of the motor is decelerated and exported, the clutch is connected to the last stage of the reduction gear train.

[0020] The utility model can increase the friction between C-shaped elastic member and clutch second component, make the transmission between C-shaped elastic member and second component more reliable, to improve the reliability and friction torque of clutch. BRIEF DESCRIPTION OF DRAWINGS

[0021] To further disclose the specific technical content of the case, first please refer to the attached drawings, wherein:

[0022] Figure 1 And Figure 2 Different view schematic diagram of clutch provided by an embodiment of the utility model is respectively shown in the drawings;

[0023] Figure 3 And Figure 4 All are Figure 1 Explosion schematic diagram of clutch shown in the drawings;

[0024] Figure 5 Is Figure 4 The top view of clutch shown in the drawings after removing the gear body of second component;

[0025] Figure 6 Schematic diagram of drive device provided by another embodiment of the utility model is shown in the drawings;

[0026] Figure 7 Is Figure 6 Schematic diagram of drive device shown in the drawings after removing part of shell;

[0027] Figure 8 Is Figure 7 Schematic diagram of motor, gear reduction assembly, clutch of drive device shown in the drawings. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiment of the utility model will be described below in conjunction with the drawings of the utility model.

[0029] Referring to Figure 1 and Figure 2 An embodiment of the utility model provides a clutch 50 including a first component 51 and a second component 61 relatively rotatable. The first component 51 can be used to drive the second component 61, or be driven by the second component 61. In this embodiment, the second component 61 is rotatably mounted to a fixed shaft 75, and can rotate around the fixed shaft 75; the first component 51 surrounds the second component 61, and can rotate around the fixed shaft 75 or the second component 61.

[0030] Referring to Figures 2 to 5 The first component 51 includes a receiving cavity 53, and the second component 61 is at least partially received in the receiving cavity 53 and is relatively rotatable with respect to the first component 51. The clutch 50 further includes a C-shaped elastic member 71 received in the receiving cavity 53, which surrounds the second component 61 and forms a frictional connection therebetween. The C-shaped elastic member 71 is provided with a first protrusion 73a and a second protrusion 73b at two ends thereof respectively. Correspondingly, the inner wall of the receiving cavity 53 is provided with a first driving block 53a and a second driving block 53b. When the first component 51 rotates relative to the second component 61 in a first rotation direction R1, the first driving block 53a can push the first protrusion 73a in the opening direction of the C-shaped elastic member 71, so that the C-shaped elastic member 71 is subjected to a force in the direction of reducing the inner diameter. In this claim and the specification, the force in the direction of reducing the inner diameter refers to a force that can cause the inner diameter of the C-shaped elastic member 71 to decrease; on the contrary, the direction of expanding refers to the inner diameter of the C-shaped elastic member 71 becoming larger. Such a force in the direction of reducing the inner diameter increases the friction between the C-shaped elastic member 71 and the second component 61, so that the transmission between the C-shaped elastic member 71 and the second component 61 is more reliable. Even if the C-shaped elastic member 71 has a certain deformation (especially an expansion deformation) or the position of the second component 61 corresponding to the C-shaped elastic member 71 is worn, the structure of the utility model can improve the friction between the C-shaped elastic member 71 and the second component 61, thereby improving the reliability and friction torque of the clutch 50.

[0031] Understandably, when the first component 51 rotates relative to the second component 61 in a second rotation direction R2, the second driving block 53b can also push the second protrusion 73b in the opening direction of the C-shaped elastic member 71, so that the C-shaped elastic member 71 is subjected to a force in the direction of reducing the inner diameter. As shown in Figure 5 The second rotation direction R2 is opposite to the first rotation direction R1, for example, the second rotation direction R2 is clockwise, and the first rotation direction R1 is counterclockwise. In this way, no matter whether the first component 51 rotates clockwise or counterclockwise, the scheme of the utility model can improve the reliability of the clutch 50.

[0032] As can be understood, when the second component 61 rotates relative to the first component 51 in the first rotation direction R1, the second driving block 53b also pushes the second protrusion 73b towards the opening of the C-shaped elastic piece 71. Similarly, when the second component 61 rotates relative to the first component 51 in the second rotation direction R2, the first driving block 53a also pushes the first protrusion 73a towards the opening of the C-shaped elastic piece 71. Therefore, no matter whether the first component 51 drives the second component 61 or the second component 61 drives the first component 51, and no matter whether the driving is clockwise or counterclockwise, the scheme of the present application can improve the reliability of the clutch 50.

[0033] In addition, as can be understood, when the transmission force between the first component 51 and the second component 61 is greater than the maximum friction force between the C-shaped elastic piece 71 and the second component 61, the C-shaped elastic piece 71 and the second component 61 will slide, realizing overload protection.

[0034] In the embodiment, the first driving block 53a is located on the side of the first protrusion 73a away from the opening of the C-shaped elastic piece 71, and a first gap 75a is formed between the first driving block 53a and the first protrusion 73a. The second driving block 53b is located on the side of the second protrusion 73b away from the opening of the C-shaped elastic piece 71, and a second gap 75b is formed between the second driving block 53b and the second protrusion 73b; at least one of the first gap 75a and the second gap 75b is greater than or equal to 0, that is, the first driving block 53a and the second driving block 53b do not need to simultaneously exert a force in the diameter-reducing direction on the C-shaped elastic piece 71. In other words, the distance between the first driving block 53a and the second driving block 53b is greater than or equal to the distance between the first protrusion 73a and the second protrusion 73b, facilitating the assembly of the C-shaped elastic piece 71 and avoiding irreversible deformation of the C-shaped elastic piece 71 due to long-term stress.

[0035] In the embodiment, the inner wall of the accommodating cavity 53 is further provided with a limiting block 53c located between the first driving block 53a and the second driving block 53b and away from the opening of the C-shaped elastic piece 71, for preventing the C-shaped elastic piece 71 from producing unwanted radial deformation or radial displacement.

[0036] In the embodiment, as shown in Figure 1 and Figure 3 The second component 61 includes an outwardly protruding flange 62 covering the opening of the accommodating cavity 53. The outer periphery of the flange 62 is provided with a plurality of outer protrusions 62a uniformly or non-uniformly distributed along the outer periphery of the flange 62, facilitating the positioning and installation of the flange 62 to the accommodating cavity 53. When the flange 62 is positioned and installed to the accommodating cavity 53, the plurality of outer protrusions 62a abut against the inner wall of the accommodating cavity 53.

[0037] In the embodiment, as shown in Figures 2 to 4As shown, the accommodating cavity 53 has a bottom 52, the first driving block 53a and the second driving block 53b are connected to or close to the bottom 52, and the axial dimension of the first driving block 53a and the second driving block 53b is slightly larger than the axial height of the C-shaped elastic member 71. In an alternative, the axial dimension of the first driving block 53a and the second driving block 53b is substantially the same as the axial height of the C-shaped elastic member 71.

[0038] In this embodiment, as shown in Figure 2 and Figure 3 , the bottom 52 of the accommodating cavity 53 is provided with a convex ring part 57 at the center, the inside of the convex ring part 57 is provided with a mounting hole 58 for the fixed shaft 75 to pass through, so that it can be stably supported by the fixed shaft 75. The inside of the bottom 52 and the outside of the convex ring part 57 form an annular positioning groove 55, the lower end of the second part 61 includes a ring body part 65, the ring body part 65 is accommodated in the positioning groove 55, and the ring body part 65 has a blind hole or a through hole at the center to accommodate the convex ring part 57. This structure not only facilitates the assembly of the second part 61 to the first part 51, but also facilitates the protection of the coaxiality of the two. Understandably, the circular positioning groove 55 also has the effect of facilitating assembly and protecting the coaxiality of the two, that is, the convex ring part 57 can not be provided. Preferably, as shown in Figure 3 and Figure 4 , the C-shaped elastic member 71 surrounds the ring body part 65 and is located above the positioning groove 55.

[0039] In this embodiment, as shown in Figure 4 and Figure 5 , the second part 61 includes a ring body part 65 and a gear body 64 detachably sleeved to the ring body part 65, and the coaxial rotation therebetween is realized through a limiting structure. The ring body part 65 includes a lower section 66 and an upper section 67, the lower section 66 serves as a clutch part, is sleeved with the C-shaped elastic member 71, and is accommodated in the accommodating cavity 53 of the first part 51. The outer diameter of the upper section 67 is smaller than that of the lower section 66, so that a step is formed at the connection between the two. The upper section 67 is formed with a first straight thread. The gear body 64 is sleeved to the upper section 67 of the ring body part 65 through its inner hole 63, the inner wall of the inner hole 63 is provided with a second straight thread, and the second straight thread cooperates with the first straight thread as a limiting structure to realize the coaxial rotation of the two. The lower end of the gear body 64 is integrally formed with a flange 62, and the outer diameter of the flange 62 is greater than that of the lower section 66 of the ring body part 65. Understandably, the limiting structure can also be realized by other means, for example, through a non-circular plug-in structure, for example, the upper section 67 of the ring body part 65 has a non-circular cross section, and the inner hole 63 of the gear body 64 is provided with a corresponding non-circular shape.

[0040] In the embodiment, the second component 61 is split into the ring body 65 and the gear body 64, so that the manufacturing cost can be reduced. In addition, the ring body 65 and the gear body 64 can be made of different materials, so that the cost can be further reduced or the reliability can be improved. For example, the ring body 65 can be made of a material with a relatively high hardness, such as metal or stainless steel. Preferably, the C-shaped elastic member 71 is also made of stainless steel and integrally formed with the first protrusion 73a and the second protrusion 73b. For example, the C-shaped elastic member 71 is made of a sheet material, and the two ends of the sheet material are bent to form the first protrusion 73a and the second protrusion 73b.

[0041] In the embodiment, the first component 51 forms a first large gear, and the gear body 61 of the second component 61 forms a first small gear. Therefore, after the clutch 60 is assembled, a double gear is formed, that is, when the transmission power is not overloaded, the clutch 60 works like a conventional double gear, and the first large gear and the first small gear rotate synchronously; when the transmission power is overloaded, the first component 51 and the second component 61 slide relative to each other, so that overload protection is realized.

[0042] The clutch provided by the embodiment can be used in a driving device to realize overload protection.

[0043] With reference to Figure 6 and Figure 7 , the driving device 100 provided by another embodiment of the utility model includes a housing 10, a motor 20 mounted in the housing 10, a reduction gear train for reducing the output of the motor 20, a clutch 50 for overload protection, and an external output end 90 for external output. The housing 10 includes a bottom shell 11 and an upper shell 13 buckled to the bottom shell 11. The housing 10 is provided with a connector 25 connected with the motor 20. The motor 20 includes an output shaft 21 and a worm 23 fixedly sleeved to the output shaft 21. The reduction gear train includes double gears 30, 40, etc.

[0044] With reference to Figure 7 and Figure 8 , the double gear 30 includes a second large gear 31 and a second small gear 35, which are coaxially fixedly connected. The second large gear 31 acts as a worm gear and is engaged with the worm 23, so as to be driven by the motor 20. The second small gear 35 rotates coaxially with the second large gear 31 to realize speed reduction. Similarly, the double gear 40 includes a third large gear 41 and a third small gear 45 which are coaxially fixed. The third large gear 41 is engaged with the second small gear 35, and the third small gear 45 rotates coaxially with the third large gear 41. The third small gear 45 is engaged with a first large gear formed by the first component 51 of the clutch 50, so as to transmit the output to the first component 51 of the clutch 50.

[0045] The first pinion formed by the second part 61 of the clutch 50 meshes with the external output end 90. Specifically, the external output end 90 comprises a gear body 91 and a non-circular driving hole 93 arranged to the gear body 91. The gear body 91 meshes with the first pinion formed by the second part 61 of the clutch 50. Understandably, when the driving device 100 drives the external load, if the load does not exceed the threshold value, the clutch 50 can normally transmit the driving force, and the driving device 100 normally drives the load; on the contrary, if the load exceeds the threshold value, the first part 51 and the second part 61 of the clutch 50 slide relative to each other, and the overload protection is realized. Conversely, when the external load reversely drives the motor, the similar overload protection function is also realized. Preferably, the clutch 50 is arranged at the last stage of the reduction gear train. For example, in the embodiment, the reduction gear train comprises the double gear 30 and the double gear 40 connected in sequence, and the clutch 50 is arranged after the double gear 40, that is, at the last stage of the reduction gear train. In this way, the force borne by the clutch 50 is smaller, and the clutch 50 is less likely to be damaged.

[0046] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A clutch comprising a first part (51) and a second part (61) rotatable relative to each other, characterized in that: the first part (51) comprises a receiving cavity (53), and the second part (61) is at least partially received in the receiving cavity (53); the clutch further comprises a C-shaped elastic member (71) received in the receiving cavity (53), the C-shaped elastic member (71) surrounds the second part (61) and forms a frictional connection therebetween, one end of the C-shaped elastic member (71) is provided with a first protrusion (73a); a first driving block (53a) is arranged on an inner wall of the receiving cavity (53), when the first part (51) rotates relative to the second part (61) in a first rotation direction, the first driving block (53a) can push the first protrusion (73a) towards an opening of the C-shaped elastic member (71), so that the C-shaped elastic member (71) is subjected to a force in a diameter-reducing direction. The other end of the C-shaped elastic member (71) is provided with a second protrusion (73b), and a second driving block (53b) is further arranged on the inner wall of the receiving cavity (53); when the first part (51) rotates relative to the second part (61) in a second rotation direction, the second driving block (53b) can push the second protrusion (73b) towards the opening of the C-shaped elastic member (71), so that the C-shaped elastic member (71) is subjected to a force in the diameter-reducing direction; the second rotation direction is opposite to the first rotation direction. The first driving block (53a) is located on a side of the first protrusion (73a) away from the opening of the C-shaped elastic member (71), and the second driving block (53b) is located on a side of the second protrusion (73b) away from the opening of the C-shaped elastic member (71); the distance between the first driving block (53a) and the second driving block (53b) is greater than or equal to the distance between the first protrusion (73a) and the second protrusion (73b). The inner wall of the receiving cavity (53) is further provided with a limiting block (53c), the limiting block (53c) is located between the first driving block (53a) and the second driving block (53b), and is located away from the opening of the C-shaped elastic member (71).

2. The clutch of claim 1, wherein, The receiving cavity (53) has a bottom (52), the first driving block (53a) and the second driving block (53b) are connected to or close to the bottom (52), and the axial dimension of the first driving block (53a) and the second driving block (53b) is substantially the same as or greater than the axial height of the C-shaped elastic member (71).

3. The clutch of claim 2, wherein, The bottom (52) of the receiving cavity (53) is provided with a circular or annular positioning groove (55), the second part (61) comprises a ring body (65), the ring body (65) is received into the positioning groove (55), and the C-shaped elastic member (71) surrounds the ring body (65) and is located above the positioning groove (55).

4. The clutch of claim 2, wherein, ​ 5. The clutch of claim 2, wherein, ​ 6. The clutch of claim 2, wherein, ​ 7. The clutch of claim 6 wherein, The second component (61) comprises the ring body (65) and a gear body (64) detachably sleeved to the ring body (65), and the ring body (65) and the gear body (64) are synchronously rotated through a limiting structure.

8. The clutch of claim 6 wherein, The ring body (65) is integrally formed by a stainless steel material; and the C-shaped elastic member (71) and the first and second convex portions (73a and 73b) are integrally formed by a stainless steel sheet.

9. A drive device comprising a motor and an external output, characterized by The clutch is further connected between the motor and an external output end; one of the first and second components can receive the driving of the motor, and the other of the first and second components can drive the external output end.

10. The drive apparatus according to claim 9, wherein The clutch is further connected to a final stage of a reduction gear train for reducing and outputting the output of the motor.

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