A cover assembly for a front sprocket of a manually driven vehicle and an assembly for a front sprocket of a manually driven vehicle.

Abstract

The purpose of this invention is to provide a cover assembly that can be installed on the front sprocket whether the crank arm is installed behind the crankshaft or in front of the crankshaft. The cover assembly 39 is used for the front sprocket 37 of the bicycle 1. The cover assembly 39 includes a first cover member 45, a second cover member 47, and a first connecting structure 49. The first cover member 45 and the second cover member 47 are mounted on the front sprocket 37. The first connecting structure 49 connects the first cover member 45 and the second cover member 47 to each other. The first cover member 45 and the second cover member 47 are disposed on the axial outer side 37a side of the front sprocket 37. The tool engaging part 54 of the first connecting structure 49 is provided on the axial inner side 37b side of the front sprocket 37 in the assembled state.

Description

Technical Field

[0001] This invention relates to a cover assembly for a front sprocket of a human-powered vehicle and an assembly for a front sprocket of a human-powered vehicle. Prior Technology

[0002] Patent Document 1 discloses a human-powered vehicle, such as a bicycle with a motor for assisting movement. This type of bicycle has a crankshaft, a pair of crank arms, a front sprocket, and a cover member. The crankshaft is mounted to rotate relative to the bicycle frame. The pair of crank arms are mounted at both ends of the crankshaft. The front sprocket is directly or indirectly connected to the crankshaft. The cover member is located between the right crank arm and the front sprocket, and is mounted on the front sprocket. [Previous Technical Documents] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent No. 5575968 Summary of the Invention

[0004] [The problem the invention aims to solve]

[0005] In previous bicycles, first, the crankshaft was mounted to the bicycle frame. Next, the front sprocket was positioned radially outward from the crankshaft. Then, the right crank arm was mounted to the crankshaft. Finally, the cover assembly was mounted to the front sprocket.

[0006] In previous bicycles, a tool fastening part was provided on the cover member for mounting the cover member to the front sprocket, and a fixing hole was formed on the right crank arm for fixing the right crank arm to the crank shaft. The tool fastening part was provided on the cover member for mounting the cover member to the front sprocket, and the tool fastening part was formed on the right crank arm for fixing the right crank arm to the crank shaft. The tool fastening part was located on the outside of the front sprocket along the axis related to the rotation center axis of the front sprocket.

[0007] In the previous cover assembly, the tool latch protruded from the axial outer side of the front sprocket, wholly or partially covering the mounting hole used to fix the right crank arm to the crankshaft. Therefore, the previous cover assembly had the problem that it could not be installed on the front sprocket before the right crank arm was fixed to the crankshaft.

[0008] The purpose of this invention is to provide a cover assembly that can be installed on the front sprocket whether the crank arm is installed behind the crankshaft or in front of the crankshaft. [Technical means to solve the problem]

[0009] According to a first embodiment of the present invention, the cover assembly is used for the front sprocket of a manually driven vehicle. The cover assembly includes a first cover member, a second cover member, and a first connecting structure. The first cover member is configured to be mounted on the front sprocket. The second cover member is configured to be mounted on the front sprocket. The first connecting structure is configured to connect the first cover member and the second cover member to each other.

[0010] The front sprocket has an axial outer surface and an axial inner surface. The axial inner surface is located axially relative to the rotation center axis of the front sprocket and is positioned opposite the axial outer surface. When the front sprocket is mounted in a manually driven vehicle, the axial inner surface is configured to face the axial center of the manually driven vehicle axially.

[0011] In the assembled state where the cover assembly and the front sprocket are assembled as a single unit, the first cover member and the second cover member are configured to be disposed on the axial outer side of the front sprocket. The first connecting structure includes a tool engaging portion. In the above-described assembled state, the tool engaging portion is disposed on the axial inner side of the front sprocket.

[0012] In the first-state cover assembly, since the tool engaging part of the first connecting structure is located on the axial inner side of the front sprocket in the above-described assembled state, the first cover member and the second cover member do not cover the fixing hole of the crank arm and are installed on the front sprocket. Therefore, the cover assembly can be installed on the front sprocket whether the crank arm is installed after the crankshaft or in front of the crankshaft.

[0013] Regarding the second embodiment of the present invention, in the cover assembly of the first embodiment, a first connecting structure is configured including a first connecting portion, a second connecting portion, and a first fastening member. The first connecting portion is provided on the first cover member. The second connecting portion is provided on the second cover member. The first fastening member is configured to connect the first connecting portion and the second connecting portion to each other.

[0014] In the second-state cover assembly, the first cover component and the second cover component can be freely installed on the front sprocket by means of the first fastening component.

[0015] Regarding the third embodiment of the present invention, the cover assembly of the first embodiment is configured as follows: The first fastening member has a first abutting portion and a first shaft portion forming a first thread. The first connecting portion has a first through hole. The second connecting portion has a first threaded hole. The first thread of the first shaft portion is configured to engage with the first threaded hole after passing through the first through hole.

[0016] In the cover assembly of the third state, the first cover component and the second cover component can be installed on the front sprocket by screwing the first thread of the first fastening member into the first threaded hole. The first cover component and the second cover component can be removed from the front sprocket by unscrewing the first thread of the first fastening member into the first threaded hole.

[0017] Regarding the fourth embodiment of the present invention, the cover assembly of the third embodiment is configured as follows: When the first thread of the first shaft portion is engaged with the first threaded hole, the first abutting portion of the first fastening member is configured to abut against the first connecting portion.

[0018] In the fourth type of cover assembly, by having the first abutting part of the first fastening member abut against the first connecting part, the first cover member and the second cover member can be reliably installed on the front sprocket.

[0019] Regarding the fifth embodiment of the present invention, the cover assembly of the first embodiment further includes a second connecting structure. The second connecting structure includes a third connecting portion, a fourth connecting portion, and a second fastening member. The third connecting portion is provided in one of the first cover member and the second cover member. The fourth connecting portion is provided in the other of the first cover member and the second cover member. The second fastening member is configured to connect the third connecting portion and the fourth connecting portion to each other.

[0020] In the fifth state of the cover assembly, the first cover component and the second cover component can be reliably installed on the front sprocket by means of the first fastening component and the second fastening component.

[0021] Regarding the sixth embodiment of the present invention, the cover assembly of the fifth embodiment is configured as follows: The second fastening member has a second abutment portion and a second shaft portion having a second thread. The third connecting portion has one of a second through hole and a second threaded hole. The fourth connecting portion has the other of a second through hole and a second threaded hole. The second thread of the second shaft portion is configured to engage with the second threaded hole after passing through the second through hole.

[0022] In the sixth-state cover assembly, the first cover component and the second cover component can be reliably installed on the front sprocket by engaging the second thread of the second fastening member with the second threaded hole. The first cover component and the second cover component can be removed from the front sprocket by disengaging the second thread of the second fastening member with the second threaded hole.

[0023] Regarding the seventh embodiment of the present invention, the cover assembly of the sixth embodiment is configured as follows: With the second thread of the second shaft portion engaged with the second threaded hole, the second abutting portion of the second fastening member is configured to abut against one of the third connecting portion and the fourth connecting portion. One of the third connecting portion and the fourth connecting portion has a second through hole.

[0024] In the cover assembly of the seventh state, by having the second abutting part of the second fastening member abut against one of the third connecting part and the fourth connecting part, the first cover member and the second cover member can be reliably installed on the front sprocket.

[0025] Regarding the eighth embodiment of the present invention, the cover assembly of the fifth embodiment is configured as follows: A third connecting portion is provided on the second cover member. A fourth connecting portion is provided on the first cover member.

[0026] In the cover assembly of the eighth state, the second cover component can have the same structure as the first cover component. This improves the manufacturing efficiency of both the first and second cover components.

[0027] Regarding the ninth embodiment of the present invention, the cover assembly of the eighth embodiment is configured as follows: The second fastening member has a second abutment portion and a second shaft portion having a second thread. The third connecting portion has a second through hole. The fourth connecting portion has a second threaded hole. The second thread of the second shaft portion is configured to engage with the second threaded hole after passing through the second through hole.

[0028] In the 9th state of the cover assembly, the second cover component can have the same structure as the first cover component. This improves the manufacturing efficiency of both the first and second cover components.

[0029] Regarding the tenth embodiment of the present invention, the cover assembly of the ninth embodiment is configured as follows: When the second thread of the second shaft portion is screwed into the second threaded hole, the second abutting portion of the second fastening member is configured to abut against the third connecting portion.

[0030] In the tenth-state cover assembly, the second cover member can have the same structure as the first cover member. This improves the manufacturing efficiency of both the first and second cover members.

[0031] Regarding the 11th embodiment of the present invention, the cover assembly of any one of the 5th to 10th embodiments is configured as follows. When the cover assembly is viewed axially, the first connecting structure is positioned on the opposite side of the second connecting structure relative to the rotation center axis.

[0032] In the cover assembly of the 11th state, by configuring the first connecting structure and the second connecting structure in the manner described above, the first cover component and the second cover component can be reliably installed on the front sprocket.

[0033] Regarding the 12th embodiment of the present invention, the cover assembly of any one of the 1st to 11th embodiments further includes a fastening structure. The fastening structure is configured to fasten to the front sprocket. The fastening structure is configured to suppress movement of the cover assembly relative to the front sprocket.

[0034] In the 12th state of the cover assembly, the movement of the cover assembly relative to the front sprocket is suppressed by the snap-fit ​​mechanism. In this way, the cover assembly can be reliably installed on the front sprocket.

[0035] Regarding the 13th embodiment of the present invention, in the cover assembly of the 12th embodiment, the fastening structure includes at least one first fastening member and at least one second fastening member. The at least one first fastening member is configured to be disposed on the first cover member, inhibiting movement of the first cover member relative to the front sprocket. The at least one second fastening member is configured to be disposed on the second cover member, inhibiting movement of the second cover member relative to the front sprocket.

[0036] In the cover assembly of the 13th state, the movement of the first cover member relative to the front sprocket and the movement of the second cover member relative to the front sprocket are suppressed by at least one first fastening member and at least one second fastening member. In this way, the first cover member and the second cover member can be reliably installed on the front sprocket.

[0037] Regarding the 14th embodiment of the present invention, the cover assembly of the 13th embodiment is configured as follows: At least one first fastening member comprises a plurality of first fastening members. At least one second fastening member comprises a plurality of second fastening members.

[0038] In the cover assembly of the 14th configuration, the movement of the first cover member relative to the front sprocket and the movement of the second cover member relative to the front sprocket are suppressed by a plurality of first fastening members and a plurality of second fastening members. In this way, the first cover member and the second cover member can be more reliably installed on the front sprocket.

[0039] Regarding the 15th embodiment of the present invention, the cover assembly is used for the front sprocket of a manually driven vehicle. The cover assembly includes a first cover member, a second cover member, and a first connecting structure. The first cover member is configured to be mounted on the front sprocket. The second cover member is configured to be mounted on the front sprocket. The first connecting structure is configured to connect the first cover member and the second cover member to each other.

[0040] The first cover member and the second cover member are assembled together in the assembly direction. The first connecting structure includes a first connecting part, a second connecting part, and a first fastening member. The first connecting part is provided on the first cover member. The second connecting part is provided on the second cover member. The first fastening member is configured to connect the first connecting part and the second connecting part to each other.

[0041] When the cover assembly and the front sprocket are assembled into a single unit, the first fastening member extends in a first fastening direction that intersects the assembly direction.

[0042] In the 15th state of the cover assembly, since the first fastening direction of fastening the first cover member and the second cover member intersects with the assembly direction of assembling the first cover member and the second cover member, the tool can easily approach the first fastening member of the first connecting structure without interfering with the front sprocket.

[0043] Regarding the 16th embodiment of the present invention, in the cover assembly of the 15th embodiment, the first acute angle defined by the first fastening direction and the assembly direction is greater than 0 degrees and less than 45 degrees.

[0044] In the cover assembly of the 16th state, by setting the first acute angle in the above manner, the tool can be made to approach the first fastening member of the first connecting structure without interfering with the front sprocket. Furthermore, the first connecting part and the second connecting part can be reliably connected via the first fastening member.

[0045] Regarding the 17th embodiment of the present invention, the cover assembly of the 15th or 16th embodiment further includes a second connecting structure. The second connecting structure includes a third connecting portion, a fourth connecting portion, and a second fastening member. The third connecting portion is provided in one of the first cover member and the second cover member. The fourth connecting portion is provided in the other of the first cover member and the second cover member. The second fastening member is configured to connect the third connecting portion and the fourth connecting portion to each other. In the assembled state, the second fastening member extends in a second fastening direction intersecting the assembly direction.

[0046] In the cover assembly of the 17th state, since the second fastening direction of fastening the first cover member and the second cover member intersects with the assembly direction of assembling the first cover member and the second cover member, the tool can easily approach the second fastening member of the second connecting structure without interfering with the front sprocket. Furthermore, the first cover member and the second cover member can be reliably installed on the front sprocket by means of the first fastening member and the second fastening member.

[0047] Regarding the 18th embodiment of the present invention, in the cover assembly of the 17th embodiment, the second acute angle defined by the second fastening direction and the assembly direction is greater than 0 degrees and less than 45 degrees.

[0048] In the cover assembly of the 18th state, by setting the second acute angle in the above manner, the tool can be made to approach the second fastening member of the second connecting structure without interfering with the front sprocket. Furthermore, the third connecting part and the fourth connecting part can be reliably connected via the second fastening member.

[0049] Regarding the 19th embodiment of the present invention, in the cover assembly of the 18th embodiment, the second acute angle is configured to be equal to the first acute angle.

[0050] In the 19th state of the cover assembly, the second cover member can have the same structure as the first cover member. This improves the manufacturing efficiency of both the first and second cover members.

[0051] Regarding the 20th embodiment of the present invention, the cover assembly of any one of the 17th to 19th embodiments is configured as follows: When the cover assembly is viewed axially relative to the rotation center axis of the front sprocket, the first connecting structure is positioned on the opposite side of the second connecting structure relative to the rotation center axis.

[0052] In the cover assembly of the 20th state, by configuring the first connecting structure and the second connecting structure in the above manner, the first cover component and the second cover component can be reliably installed on the front sprocket.

[0053] Regarding the 21st embodiment of the present invention, the front sprocket assembly is used for a manually driven vehicle. The front sprocket assembly includes a front sprocket and a cover assembly described in any of the 1st to 20th embodiments.

[0054] In the sprocket assembly prior to state 21, since the front sprocket assembly has the aforementioned cover assembly, the cover assembly can be installed on the front sprocket whether the crank arm is installed behind the crankshaft or in front of the crankshaft. Furthermore, the tool can be easily accessed by the tool without interfering with the front sprocket, and / or the first and / or second connecting structures. [Effects of the Invention]

[0055] In this invention, in the cover assembly for a human-powered vehicle and the sprocket assembly having the cover assembly, the cover assembly can be installed on the front sprocket either after the crank arm is installed behind the crankshaft or before the crankshaft. Simple Explanation of the Diagram

[0056] Figure 1 is a side view of a bicycle according to an embodiment of the present invention. Figure 2 is a schematic diagram of a bicycle viewed from above. Figure 3 is a cross-sectional view of the crank assembly, sprocket assembly, cover assembly, and auxiliary mechanisms. Figure 4 shows a front view of the crank assembly, sprocket assembly, cover assembly, and auxiliary mechanisms. Figure 5 shows a front view of the sprocket assembly and the cover assembly. Figure 6 shows the rear view of the sprocket assembly and the cover assembly. Figure 7 shows a front view of the crank assembly, sprocket assembly, and cover assembly. Figure 8 shows a front view of the cover assembly. Figure 9 shows the rear view of the sash assembly. Figure 10A shows a cross-sectional view of the first connecting structure. Figure 10B is a cross-sectional view of the second connecting structure. Figure 11A is a front view used to illustrate the assembly configuration of the cover assembly. Figure 11B is a front view used to illustrate the assembly configuration of the cover assembly. Implementation

[0057] As shown in Figure 1, a bicycle 1 according to one embodiment of the present invention includes a frame 3, handlebars 5, a front wheel 7, a rear wheel 9, a drive unit 11, and a chain 13. The bicycle 1 is an example of a human-powered vehicle. As shown in Figure 2, the bicycle 1 has an axial center plane BP.

[0058] As shown in Figures 1 and 2, the handlebar 5 is mounted on the front fork 15. The front fork 15 is mounted to the front of the frame 3 in a manner that allows it to rotate relative to the frame 3. The front wheel 7 is mounted to the front fork 15 in a manner that allows it to rotate relative to the front fork 15. The rear wheel 9 is mounted to the rear of the frame 3 in a manner that allows it to rotate relative to the frame 3.

[0059] The drive unit 11 includes a rear sprocket assembly 17, an auxiliary mechanism 19, a crank assembly 21, and a front sprocket assembly 23. The rear sprocket assembly 17 is mounted to the rear of the frame 3 in a manner that allows it to rotate relative to the frame 3. The rear sprocket assembly 17 includes at least one rear sprocket 25. The at least one rear sprocket 25 is engaged with the chain 13.

[0060] As shown in Figure 3, the auxiliary mechanism 19 has a housing 27, a motor (not shown), and a drive shaft 31 driven by the motor. The housing 27 is mounted on the lower part of the frame 3.

[0061] The motor is housed inside the housing 27. The motor generates auxiliary power based on the pedal pressure. Specifically, the motor generates auxiliary power based on the rotational torque of the crankshaft 33 (described later). The auxiliary power of the motor is transmitted to the drive shaft 31. The drive shaft 31 is mounted in the housing 27 of the auxiliary mechanism 19 in a rotatable manner relative to the housing 27. The drive shaft 31 is cylindrical.

[0062] As shown in Figure 3, the crank assembly 21 has a crankshaft 33 and a pair of crank arms 34. The crankshaft 33 is mounted on the housing 27 of the auxiliary mechanism 19 in a manner that allows it to rotate relative to the housing 27 of the auxiliary mechanism 19. For example, the crankshaft 33 is inserted into the inner periphery of the drive shaft 31.

[0063] The crankshaft 33 is directly or indirectly connected to the drive shaft 31. The rotational torque of the crankshaft 33 is transmitted to the drive shaft 31. The rotation center axis X1 of the crankshaft 33 is concentric with the rotation center axis X2 of the sprocket 37 described later.

[0064] A pair of pedals are mounted on each of a pair of crank arms 34. The pair of crank arms 34 includes a first crank arm 35 and a second crank arm 36. The first crank arm 35 and the second crank arm 36 are respectively mounted on both ends of the crankshaft 33. The first crank arm 35 and the second crank arm 36 rotate integrally with the crankshaft 33.

[0065] For example, the first crank arm 35 has a pair of fixing holes 35a and 35b. With the first crank arm 35 positioned at one end of the crankshaft 33, a pair of bolts 35c are screwed into the fixing holes 35a and 35b respectively. This fixes the first crank arm 35 to one end of the crankshaft 33. The second crank arm 36, like the first crank arm 35, is fixed to the other end of the crankshaft 33.

[0066] The front sprocket assembly 23 is used in the bicycle 1. As shown in Figures 1 and 2, the front sprocket assembly 23 is mounted on the frame 3 via the auxiliary mechanism 19 in a manner that allows it to rotate relative to the frame 3. For example, as shown in Figure 3, the front sprocket assembly 23 is mounted on the drive shaft 31 of the auxiliary mechanism 19 in a manner that allows it to rotate relative to the housing 27 of the auxiliary mechanism 19.

[0067] When the auxiliary mechanism 19 is not used, the front sprocket assembly 23 is mounted on the crank assembly 21. In this case, for example, the front sprocket assembly 23 is mounted on the first crank arm 35 or the crankshaft 33.

[0068] As shown in Figures 3 and 4, the front sprocket assembly 23 includes a front sprocket 37 and a cover assembly 39. As shown in Figure 3, the front sprocket 37 is directly or indirectly connected to the crankshaft 33. For example, the front sprocket 37 is connected to the crankshaft 33 via a drive shaft 31 to transmit driving force.

[0069] As shown in Figures 3 and 4, the front sprocket 37 is positioned between the first crank arm 35 and the housing 27 of the auxiliary mechanism 19. The front sprocket 37 is fastened to the chain 13. The front sprocket 37 has a rotational center axis X2.

[0070] As shown in Figure 4, the front sprocket 37 has a sprocket body 41 and a plurality of sprocket teeth 43. As shown in Figures 5 and 6, the sprocket body 41 has a body portion 41a, a mounting portion 41b, and a plurality of mounting arms 41c. The body portion 41a is formed in a ring shape.

[0071] As shown in Figure 3, the mounting part 41b is mounted on the drive shaft 31. For example, the mounting part 41b is formed in a cylindrical shape. The inner circumferential surface of the mounting part 41b and the outer circumferential surface of the drive shaft 31 are engaged by a spline to transmit torque. In this way, the front sprocket 37 and the drive shaft 31 rotate as a unit.

[0072] As shown in Figures 5 and 6, a plurality of mounting arms 41c extend radially relative to the rotation center axis X2 of the front sprocket 37. The plurality of mounting arms 41c connects the main body 41a and the mounting portion 41b radially relative to the rotation center axis X2 of the front sprocket 37. In this embodiment, the plurality of mounting arms 41c includes four mounting arms 41c1, 41c2, 41c3, and 41c4.

[0073] As shown in Figures 5, 6 and 7, the front sprocket 37 has an axial outer surface 37a and an axial inner surface 37b. As shown in Figure 7, with the crank assembly 21 installed, the axial outer surface 37a is located on the side of the first crank arm 35.

[0074] The axial inner surface 37b is disposed on the opposite side of the axial outer surface 37a in the axial direction related to the rotation center axis X2 of the front sprocket 37. When the front sprocket 37 is mounted on the bicycle 1, the axial inner surface 37b is configured to face the axial center plane BP of the bicycle 1 in the axial direction related to the rotation center axis X2 of the front sprocket 37.

[0075] As shown in Figures 4, 5, and 6, a plurality of sprocket teeth 43 extend radially outward from the outer peripheral surface of the sprocket body 41 in a radial direction related to the rotation center axis X2 of the front sprocket 37. For example, a plurality of sprocket teeth 43 extend radially outward from the outer peripheral surface of the body portion 41a in a radial direction related to the rotation center axis X2 of the front sprocket 37.

[0076] As shown in Figures 1 and 2, chain 13 is mounted on crank assembly 21 and rear sprocket assembly 17. For example, chain 13 is mounted on front sprocket 37 and at least one rear sprocket 25. The driving force input to crank assembly 21 is transmitted to rear sprocket assembly 17 via chain 13. By means of this driving force, rear wheel 9 rotates. It can also be interpreted that chain 13 is included in drive unit 11.

[0077] The cover assembly 39 is used for the front sprocket 37 of the bicycle 1. As shown in Figures 5 and 6, the cover assembly 39 is mounted on the front sprocket 37. As shown in Figure 6, the cover assembly 39 includes a first cover member 45, a second cover member 47, and a first connecting structure 49. The cover assembly 39 further includes a second connecting structure 51. The cover assembly 39 further includes a fastening mechanism 53.

[0078] As shown in Figures 5 and 7, in the assembled state where the cover assembly 39 and the front sprocket 37 are assembled into a single unit, the first cover member 45 and the second cover member 47 are configured to be disposed on the axial outer side 37a side of the front sprocket 37.

[0079] As shown in Figure 6, the first cover member 45 is configured to be mounted on the front sprocket 37. For example, the first cover member 45 is detachably mounted on the front sprocket 37.

[0080] As shown in Figure 7, in the assembled state where the cover assembly 39 and the front sprocket 37 are assembled into a single unit, the axial outer side 37a of the front sprocket 37 is positioned between the axial outer side 45a of the first cover member 45 and the axial inner side 37b of the front sprocket 37.

[0081] The axial outer surface 45a of the first cover member 45 is disposed on the axis related to the rotation center axis X2 of the front sprocket 37, between the fixing hole 35a of the first crank arm 35 and the axial center surface FP of the front sprocket 37.

[0082] In detail, the axial outer surface 45a of the first cover member 45 is disposed in the axial direction related to the rotation center axis X2 of the front sprocket 37, between the fixing hole 35a of the first crank arm 35 and the axial outer surface 37a of the front sprocket 37.

[0083] As shown in Figure 8, the first cover member 45 has a pair of first opposing surfaces 46a and 46b. In this embodiment, the pair of first opposing surfaces 46a and 46b are disposed on the axial outer side surface 45a side of the first cover member 45.

[0084] With the covered assembly 39 and the front sprocket 37 assembled, the first opposing surfaces 46a and 46b are arranged at intervals around each other in the circumferential direction related to the rotation center axis X2 of the front sprocket 37.

[0085] For example, with the covered assembly 39 and the front sprocket 37 assembled, a pair of first opposing surfaces 46a and 46b are arranged 180 degrees apart in the radial direction related to the rotation center axis X2 of the front sprocket 37.

[0086] As shown in Figure 6, the second cover member 47 is configured to be mounted on the front sprocket 37. For example, the second cover member 47 is detachably mounted on the front sprocket 37.

[0087] As shown in Figure 7, in the assembled state where the cover assembly 39 and the front sprocket 37 are assembled into a single unit, the axial outer side 37a of the front sprocket 37 is positioned between the axial outer side 47a of the second cover member 47 and the axial inner side 37b of the front sprocket 37.

[0088] The axial outer surface 47a of the second cover member 47 is disposed on the axis related to the rotation center axis X2 of the front sprocket 37, between the fixing hole 35a of the first crank arm 35 and the axial center surface FP of the front sprocket 37.

[0089] In detail, the axial outer surface 47a of the second cover member 47 is disposed in the axial direction related to the rotation center axis X2 of the front sprocket 37, between the fixing hole 35a of the first crank arm 35 and the axial outer surface 37a of the front sprocket 37.

[0090] As shown in Figure 8, the second cover member 47 has a pair of second opposing surfaces 48a and 48b. In this embodiment, the pair of second opposing surfaces 48a and 48b are disposed on the axial outer surface 47a side of the second cover member 47.

[0091] With the covered assembly 39 and the front sprocket 37 assembled, the pair of second opposing surfaces 48a and 48b are arranged at intervals around each other in the circumferential direction related to the rotation center axis X2 of the front sprocket 37.

[0092] For example, with the covered assembly 39 and the front sprocket 37 assembled, a pair of second opposing surfaces 48a and 48b are arranged radially at a distance of 180 degrees from each other along the rotational axis X2 of the front sprocket 37. In the circumferential direction related to the rotational axis X2 of the front sprocket 37, a pair of second opposing surfaces 48a and 48b are respectively arranged opposite to a pair of first opposing surfaces 46a and 46b.

[0093] As shown in Figures 6 and 9, the first connecting structure 49 is configured to connect the first cover member 45 and the second cover member 47 to each other. As shown in Figure 7, the first connecting structure 49 includes a first tool engaging part 54. The first tool engaging part 54 is provided on the axial inner side 37b side of the front sprocket 37 when the cover assembly 39 and the front sprocket 37 are assembled into a single unit.

[0094] As shown in Figure 10A, the first connecting structure 49 includes a first connecting portion 55, a second connecting portion 57, and a first fastening member 59. The first connecting portion 55 is provided on the first cover member 45. For example, the first connecting portion 55 is provided on the axial inner surface 45b of the first cover member 45. The first connecting portion 55 is integrally formed with the first cover member 45. The first connecting portion 55 has a first through hole 55a.

[0095] The second connecting portion 57 is provided on the second cover member 47. For example, the second connecting portion 57 is provided on the axial inner surface 47b of the second cover member 47. The second connecting portion 57 is integrally formed with the second cover member 47. The second connecting portion 57 has a first threaded hole 57a.

[0096] As shown in Figure 10A, the first fastening member 59 is configured to connect the first connecting portion 55 and the second connecting portion 57 to each other. The first fastening member 59 has a first abutting portion 59a and a first shaft portion 59b. A first thread 59c is formed in the first shaft portion 59b. The first thread 59c of the first shaft portion 59b is configured to engage with the first threaded hole 57a of the second connecting portion 57 after passing through the first through hole 55a of the first connecting portion 55. For example, the first thread 59c is formed on the outer peripheral surface of the first shaft portion 59b. In detail, the first fastening member 59 is a threaded member.

[0097] With the first thread 59c of the first shaft portion 59b engaged with the first threaded hole 57a, the first abutting portion 59a of the first fastening member 59 is configured to abut against the first connecting portion 55. With the first thread 59c of the first shaft portion 59b engaged with the first threaded hole 57a, the cover assembly 39 and the front sprocket 37 are assembled by abutting the first abutting portion 59a of the first fastening member 59 against the first connecting portion 55.

[0098] As shown in Figures 6 and 9, the second connecting structure 51 is configured to connect the first cover member 45 and the second cover member 47 to each other. As shown in Figure 7, the second connecting structure 51 includes a second tool engaging part 60. The second tool engaging part 60 is provided on the axial inner side 37b side of the front sprocket 37 when the cover assembly 39 and the front sprocket 37 are assembled into a single unit.

[0099] As shown in Figure 10B, the second connecting structure 51 includes a third connecting part 61, a fourth connecting part 63, and a second fastening member 65. The third connecting part 61 is provided in one of the first cover member 45 and the second cover member 47. The fourth connecting part 63 is provided in the other of the first cover member 45 and the second cover member 47.

[0100] The third connecting part 61 has one of the second through hole 67a and the second threaded hole 67b. The fourth connecting part 63 has the other of the second through hole 67a and the second threaded hole 67b. That is, one of the third connecting part 61 and the fourth connecting part 63 has the second through hole 67a. The other of the third connecting part 61 and the fourth connecting part 63 has the second threaded hole 67b.

[0101] As shown in Figure 10B, the second fastening member 65 is configured to connect the third connecting portion 61 and the fourth connecting portion 63 to each other. The second fastening member 65 has a second abutting portion 65a and a second shaft portion 65b. A second thread 65c is formed in the second shaft portion 65b. The second thread 65c of the second shaft portion 65b is configured to engage with the second threaded hole 67b after passing through the second through hole 67a. For example, the second thread 65c is formed on the outer peripheral surface of the second shaft portion 65b. In detail, the second fastening member 65 is a threaded member.

[0102] When the second thread 65c of the second shaft portion 65b is engaged with the second threaded hole 67b, the second abutting portion 65a of the second fastening member 65 is configured to abut against one of the third connecting portion 61 and the fourth connecting portion 63.

[0103] In this embodiment, as shown in FIG10B, a third connecting portion 61 is provided on the second cover member 47. For example, the third connecting portion 61 is provided on the axial inner surface 47b of the second cover member 47. The third connecting portion 61 is integrally formed with the second cover member 47. The third connecting portion 61 has a second through hole 67a.

[0104] A fourth connecting portion 63 is provided on the first cover member 45. For example, the fourth connecting portion 63 is provided on the axial inner surface 45b of the first cover member 45. The fourth connecting portion 63 is integrally formed with the first cover member 45. The fourth connecting portion 63 has a second threaded hole 67b.

[0105] The second thread 65c of the second shaft portion 65b is configured to engage with the second threaded hole 67b of the fourth connecting portion 63 after passing through the second through hole 67a. With the second thread 65c of the second shaft portion 65b engaged with the second threaded hole 67b of the fourth connecting portion 63, the second abutting portion 65a of the second fastening member 65 is configured to abut against the third connecting portion 61.

[0106] With the second thread 65c of the second shaft portion 65b engaged with the second threaded hole 67b of the fourth connecting portion 63, the cover assembly 39 and the front sprocket 37 are assembled by having the second abutting portion 65a of the second fastening member 65 abut against the third connecting portion 61.

[0107] The first connecting structure 49 and the second connecting structure 51 are configured as follows. As shown in FIG9, when the cover assembly 39 is viewed axially relative to the rotation center axis X2 of the front sprocket 37, the first connecting structure 49 is positioned on the opposite side of the second connecting structure 51 relative to the rotation center axis X2 of the front sprocket 37. For example, the first connecting structure 49 and the second connecting structure 51 are configured circumferentially spaced 180 degrees apart from each other in the rotation center axis X2 of the front sprocket 37.

[0108] As shown in Figure 6, the fastening mechanism 53 is configured to suppress movement of the cover assembly 39 relative to the front sprocket 37. For example, the fastening mechanism 53 is configured to suppress movement of the cover assembly 39 relative to the sprocket body 41. The fastening mechanism 53 is configured to fasten to the front sprocket 37. For example, the fastening mechanism 53 is configured to fasten to a plurality of mounting arms 41c1, 41c2, 41c3, and 41c4 of the sprocket body 41.

[0109] As shown in Figures 6 and 9, the fastening structure 53 is disposed on the first cover member 45 and the second cover member 47. The fastening structure 53 includes at least one first fastening member 69 and at least one second fastening member 71.

[0110] At least one first engaging member 69 is disposed on the first cover member 45. The at least one first engaging member 69 is configured to inhibit the movement of the first cover member 45 relative to the front sprocket 37.

[0111] For example, as shown in FIG6, at least one first engaging member 69 is configured to inhibit movement of the first cover member 45 relative to the sprocket body 41. In detail, at least one first engaging member 69 is configured to inhibit movement of the first cover member 45 relative to a plurality of mounting arms 41c of the sprocket body 41.

[0112] At least one first engaging member 69 is configured to engage with at least one of the plurality of mounting arms 41c. The at least one first engaging member 69 includes a plurality of first engaging members 69a and 69b. In this embodiment, the at least one first engaging member 69 includes two first engaging members 69a and 69b.

[0113] As shown in Figure 9, the first fastening member 69a is integrally formed with the first cover member 45. The first fastening member 69a may also be separately provided on the first cover member 45. The first fastening member 69a is formed in the shape of a hook. The front end of the first fastening member 69a extends in the first rotational direction R1.

[0114] As shown in Figure 6, the first fastening member 69a is fastened to the mounting arm 41c1. For example, in the axial direction related to the rotation center axis X2 of the front sprocket 37, the first fastening member 69a is fastened to the mounting arm 41c1 in such a way that the mounting arm 41c1 is arranged between the first cover member 45 and the axial direction of the first fastening member 69a.

[0115] As shown in Figure 9, the first engaging member 69b is integrally formed with the first cover member 45. Alternatively, the first engaging member 69b can be separately disposed on the first cover member 45. The first engaging member 69b is spaced apart from the first engaging member 69a in the circumferential direction related to the rotation center axis X2 of the front sprocket 37. The first engaging member 69b is hook-shaped. The front end of the first engaging member 69b extends in a second rotational direction R2, opposite to the first rotational direction R1.

[0116] As shown in Figure 6, the first fastening member 69b is fastened to the mounting arm 41c2. For example, in the axial direction related to the rotation center axis X2 of the front sprocket 37, the first fastening member 69b is fastened to the mounting arm 41c2 in such a way that the mounting arm 41c2 is arranged between the first cover member 45 and the axial direction of the first fastening member 69b.

[0117] With the first fastening members 69a and 69b fastened to the mounting arms 41c1 and 41c2, the first fastening members 69a and 69b are arranged between the mounting arms 41c1 and 41c2 in the circumferential direction related to the rotation center axis X2 of the front sprocket 37.

[0118] As shown in Figures 6 and 9, at least one second engaging member 71 is disposed on the second cover member 47. As shown in Figure 6, at least one second engaging member 71 is configured to inhibit the movement of the second cover member 47 relative to the front sprocket 37.

[0119] For example, at least one second engaging member 71 is configured to inhibit the movement of the second cover member 47 relative to the sprocket body 41. In detail, at least one second engaging member 71 is configured to inhibit the movement of the second cover member 47 relative to a plurality of mounting arms 41c of the sprocket body 41.

[0120] At least one second engaging member 71 is configured to engage with at least one of the plurality of mounting arms 41c. The at least one second engaging member 71 includes a plurality of second engaging members 71a and 71b. In this embodiment, the at least one second engaging member 71 includes two second engaging members 71a and 71b.

[0121] As shown in Figure 9, the second fastening member 71a is integrally formed with the second cover member 47. The second fastening member 71a may also be separately provided on the second cover member 47. The second fastening member 71a is formed in the shape of a hook. The front end of the second fastening member 71a extends in the first rotational direction R1.

[0122] As shown in Figure 6, the second fastening member 71a is fastened to the mounting arm 41c3. For example, in the axial direction related to the rotation center axis X2 of the front sprocket 37, the second fastening member 71a is fastened to the mounting arm 41c3 in such a way that the mounting arm 41c3 is arranged between the second cover member 47 and the axial direction of the second fastening member 71a.

[0123] As shown in Figure 9, the second engaging member 71b is integrally formed with the second cover member 47. Alternatively, the second engaging member 71b can be separately disposed on the second cover member 47. The second engaging member 71b is spaced apart from the second engaging member 71a in the circumferential direction related to the rotational center axis X2 of the front sprocket 37. The second engaging member 71b is hook-shaped. The front end of the second engaging member 71b extends in the second rotational direction R2.

[0124] As shown in Figure 6, the second fastening member 71b is fastened to the mounting arm 41c4. For example, in the axial direction related to the rotation center axis X2 of the front sprocket 37, the second fastening member 71b is fastened to the mounting arm 41c4 in such a way that the mounting arm 41c4 is arranged between the second cover member 47 and the axial direction of the second fastening member 71b.

[0125] As shown in Figure 9, with the second fastening members 71a and 71b fastened to the mounting arms 41c3 and 41c4, the second fastening members 71a and 71b are arranged between the mounting arms 41c3 and 41c4 in the circumferential direction related to the rotation center axis X2 of the front sprocket 37.

[0126] The cover assembly 39 having the above-described configuration is assembled in the following manner. As shown in FIG11A, in this embodiment, the second cover member 47 is disposed on the front sprocket 37. Subsequently, as shown in FIG11B, the first cover member 45 is disposed on the front sprocket 37. Alternatively, the second cover member 47 may be disposed on the front sprocket 37 after the first cover member 45 has been disposed on the front sprocket 37.

[0127] First, as shown in Figure 11A, the second cover member 47 is positioned on the mounting arms 41c3 and 41c4 of the front sprocket 37 by engaging the second fastening members 71a and 71b of the second cover member 47 with the mounting arms 41c3 and 41c4 of the front sprocket 37.

[0128] Next, by bringing the first cover member 45 toward the second cover member 47 in the assembly direction AD1, the first fastening members 69a and 69b of the first cover member 45 are fastened to the mounting arms 41c1 and 41c2 of the front sprocket 37. Thus, as shown in FIG11B, the first cover member 45 is positioned on the mounting arms 41c1 and 41c2 of the front sprocket 37.

[0129] In this state, the first connecting portion 55 of the first cover member 45 abuts against the second connecting portion 57 of the second cover member 47, and the fourth connecting portion 63 of the first cover member 45 abuts against the third connecting portion 61 of the second cover member 47.

[0130] Next, as shown in Figures 10A and 10B, the first fastening member 59 is inserted through the first through hole 55a of the first connecting portion 55 in the first fastening direction SD1, and screwed into the first threaded hole 57a of the second connecting portion 57. For example, the first thread 59c of the first fastening member 59 is inserted through the first through hole 55a of the first connecting portion 55. Then, the first thread 59c of the first fastening member 59 is screwed into the first threaded hole 57a of the second connecting portion 57. In this way, the first fastening member 59 connects the first cover member 45 and the second cover member 47 to each other.

[0131] Similarly, the second fastening member 65, in the second fastening direction SD2, is inserted through the second through hole 67a of the third connecting portion 61 and screwed into the second threaded hole 67b of the fourth connecting portion 63. For example, the second thread 65c of the second fastening member 65 is inserted through the second through hole 67a of the third connecting portion 61. Then, the second thread 65c of the second fastening member 65 is screwed into the second threaded hole 67b of the fourth connecting portion 63. In this way, the second fastening member 65 connects the first cover member 45 and the second cover member 47 to each other.

[0132] The aforementioned cover assembly 39 can be installed on the front sprocket 37 either after the first crank arm 35 is installed on the crankshaft 33 or before the crankshaft 33.

[0133] Thus, the first cover member 45 and the second cover member 47 are assembled together in the assembly direction AD1. As shown in Figure 11A, the assembly direction AD1 is the direction in which the first cover member 45 approaches the second cover member 47. For example, when observing the front sprocket 37 and the cover assembly 39 in the axial direction related to the rotation center axis X2 of the front sprocket 37, the assembly direction AD1 is orthogonal to the pair of first opposing surfaces 46a and 46b of the first cover member 45 and the pair of second opposing surfaces 48a and 48b of the second cover member 47.

[0134] As shown in Figure 10A, in the assembled state where the cover assembly 39 and the front sprocket 37 are assembled into a single unit, the first fastening member 59 extends in a first fastening direction SD1 intersecting the assembly direction AD1. The first fastening direction SD1 is the direction in which the first fastening member 59 is inserted into the first through hole 55a of the first connecting part 55. More specifically, the first fastening direction SD1 is the direction in which the first fastening member 59 is inserted into the first through hole 55a of the first connecting part 55 when the first through hole 55a of the first connecting part 55 and the first threaded hole 57a of the second connecting part 57 are arranged opposite each other.

[0135] As shown in Figure 10B, in the assembled state where the cover assembly 39 and the front sprocket 37 are assembled into a single unit, the second fastening member 65 extends in a second fastening direction SD2, which intersects the assembly direction AD1. The second fastening direction SD2 is the direction in which the second fastening member 65 is inserted into the second through hole 67a of the third connecting part 61. More specifically, the second fastening direction SD2 is the direction in which the second fastening member 65 is inserted into the second through hole 67a of the third connecting part 61 when the second through hole 67a of the third connecting part 61 and the second threaded hole 67b of the fourth connecting part 63 are arranged opposite each other.

[0136] When the cover assembly is assembled as described above, as shown in FIG11B, the first acute angle A1 is defined by the first fastening direction SD1 and the assembly direction AD1. For example, when observing the front sprocket 37 and the cover assembly 39 along the axis related to the rotation center axis X2 of the front sprocket 37, the first acute angle A1 is defined by the first fastening direction SD1 and the assembly direction AD1. The first acute angle A1 is greater than 0 degrees and less than 45 degrees. Preferably, the first acute angle A1 is 5 degrees or more and 15 degrees or less. For example, the first acute angle A1 is 10 degrees.

[0137] The second acute angle A2 is defined by the second fastening direction SD2 and the assembly direction AD1. For example, when observing the front sprocket 37 and the cover assembly 39 along the axis related to the rotation center axis X2 of the front sprocket 37, the second acute angle A2 is defined by the second fastening direction SD2 and the assembly direction AD1. The second acute angle A2 is greater than 0 degrees and less than 45 degrees. Preferably, the second acute angle A2 is 5 degrees or more and 15 degrees or less. For example, the second acute angle A2 is 10 degrees. That is, in this embodiment, the second acute angle A2 is equal to the first acute angle A1. [Industrial Applicability]

[0138] This invention can be used in a cover assembly for a front sprocket of a human-powered vehicle and in a front sprocket assembly for a human-powered vehicle.

[0139] 1: Bicycle 3: Frame 5: Grip 7: Front wheel 9: Rear wheel 11: Drive Unit 13: Chain 15: Front fork 17: Rear sprocket assembly 19: Auxiliary institutions 21: Crank assembly 23: Front sprocket assembly 25: Rear sprocket 27: Shell 31: Drive shaft 33: Crankshaft 34: Crank arm 35: First crank arm 35a, 35b: Fixing holes 35c: Bolt 36: Second crank arm 37: Front sprocket 37a: Axial outer surface 37b: Axial inner surface 39: Cover assembly 41: Sprocket body 41a: Ontology part 41b: Installation Department 41c: Mounting arm 41c1, 41c2, 41c3, 41c4: Mounting arms 43: Sprocket teeth 45: First cover component 45a: Axial outer surface 45b: Axial inner surface 46a, 46b: First opposing plane 47: Second cover component 47a: Axial outer surface 47b: Axial inner surface 48a, 48b: Second opposing plane 49: The first company's structural construction 51: Second Company Structure 53: Snap-fit ​​construction 54: First tool fastening part 55: First connecting section 55a: First through hole 57: Second connecting section 57a: First threaded hole 59: First fastening component 59a: First contact section 59b: First shaft section 59c: First thread 60: Second tool fastening part 61: Third Link 63: Fourth Link 65: Second fastening component 65a: Second contact section 65b: Second shaft section 65c: Second thread 67a: Second through hole 67b: Second threaded hole 69: First fastening component 69a, 69b: First fastening component 71: Second fastening component 71a, 71b: Second fastening component A1: First acute angle A2: Second acute angle AD1: Assembly Direction BP: Axial center plane FP: Axial center plane R1: First rotation direction R2: Second rotation direction SD1: First fastening direction SD2: Second fastening direction X1: Rotation center axis X2: Rotation center axis

Claims

1. A cover assembly for use on the front sprocket of a manually driven vehicle, comprising: a first cover member configured to be mounted on the front sprocket; a second cover member configured to be mounted on the front sprocket; and a first connecting structure configured to connect the first cover member and the second cover member to each other; wherein the front sprocket has an axially outer side surface and an axially inner side surface disposed on the opposite side of the axially outer side surface in an axial direction related to the rotation center axis of the front sprocket; in an installation state in which the front sprocket is mounted on the manually driven vehicle, the axially inner side surface is configured to face the axial center face of the manually driven vehicle in the axial direction; in an assembly state in which the cover assembly and the front sprocket are assembled as a unit, the first cover member and the second cover member are configured to be disposed on the axially outer side surface of the front sprocket; the first connecting structure includes a tool engaging portion disposed on the axially inner side surface of the front sprocket in the assembly state.

2. The cover assembly as claimed in claim 1, wherein the first connecting structure comprises a first connecting portion disposed on the first cover member, a second connecting portion disposed on the second cover member, and a first fastening member configured to connect the first connecting portion and the second connecting portion to each other.

3. The cover assembly as claimed in claim 2, wherein the first fastening member has a first abutting portion and a first shaft portion forming a first thread; the first connecting portion has a first through hole; the second connecting portion has a first threaded hole; and the first thread of the first shaft portion is configured to engage with the first threaded hole after passing through the first through hole.

4. The cover assembly as claimed in claim 3, wherein when the first thread of the first shaft portion is engaged with the first threaded hole, the first abutting portion of the first fastening member is configured to abut against the first connecting portion.

5. The cover assembly of claim 1 further comprises: a second connecting structure, which includes a third connecting portion disposed on one of the first cover member and the second cover member, a fourth connecting portion disposed on the other of the first cover member and the second cover member, and a second fastening member configured to connect the third connecting portion and the fourth connecting portion to each other.

6. The cover assembly as claimed in claim 5, wherein the second fastening member has a second abutment portion and a second shaft portion having a second thread; the third connecting portion has one of a second through hole and a second threaded hole; the fourth connecting portion has the other of the second through hole and the second threaded hole; and the second thread of the second shaft portion is configured to engage with the second threaded hole after passing through the second through hole.

7. The cover assembly of claim 6, wherein, in the state where the second thread of the second shaft portion is engaged with the second threaded hole, the second abutting portion of the second fastening member is configured to abut against one of the third connecting portion and the fourth connecting portion; one of the third connecting portion and the fourth connecting portion has the second through hole.

8. The cover assembly as claimed in claim 5, wherein the third connecting portion is provided on the second cover member; and the fourth connecting portion is provided on the first cover member.

9. The cover assembly of claim 8, wherein the second fastening member has a second abutment portion and a second shaft portion having a second thread; the third connecting portion has a second through hole; the fourth connecting portion has a second threaded hole; and the second thread of the second shaft portion is configured to engage with the second threaded hole after passing through the second through hole.

10. The cover assembly of claim 9, wherein, in the state where the second thread of the second shaft portion is engaged with the second threaded hole, the second abutting portion of the second fastening member is configured to abut against the third connecting portion.

11. The cover assembly of any one of claims 5 to 10, wherein when the cover assembly is viewed in the aforementioned axial direction, the first connecting structure is positioned on the opposite side of the second connecting structure relative to the aforementioned rotation center axis.

12. The cover assembly of any one of claims 1 to 10 further comprises: a fastening mechanism configured to fasten to the front sprocket; and the fastening mechanism configured to inhibit movement of the cover assembly relative to the front sprocket.

13. The cover assembly of claim 12, wherein the fastening mechanism comprises: at least one first fastening member configured to be disposed on the first cover member to suppress movement of the first cover member relative to the front sprocket; and at least one second fastening member configured to be disposed on the second cover member to suppress movement of the second cover member relative to the front sprocket.

14. The cover assembly of claim 13, wherein the at least one first fastening member comprises a plurality of first fastening members; and the at least one second fastening member comprises a plurality of second fastening members.

15. A cover assembly for use with a front sprocket of a manually driven vehicle, comprising: a first cover member configured to be mounted on the front sprocket; a second cover member configured to be mounted on the front sprocket; and a first connecting structure configured to connect the first cover member and the second cover member to each other; wherein the first cover member and the second cover member are assembled to each other in an assembly direction; the first connecting structure includes a first connecting portion provided in the first cover member, a second connecting portion provided in the second cover member, and a first fastening member configured to connect the first connecting portion and the second connecting portion to each other; wherein, in an assembled state in which the cover assembly and the front sprocket are assembled as a unit, the first fastening member extends in a first fastening direction intersecting the assembly direction.

16. The cover assembly of claim 15, wherein the first acute angle defined by the first fastening direction and the assembly direction is greater than 0 degrees and less than 45 degrees.

17. The cover assembly of claim 15 or 16 further comprises: a second connecting structure having a third connecting portion disposed on one of the first cover member and the second cover member, a fourth connecting portion disposed on the other of the first cover member and the second cover member, and a second fastening member configured to connect the third connecting portion and the fourth connecting portion to each other; and in the assembled state, the second fastening member extends in a second fastening direction intersecting the assembly direction.

18. The cover assembly as claimed in claim 17, wherein the second acute angle defined by the second fastening direction and the assembly direction is greater than 0 degrees and less than 45 degrees.

19. The cover assembly of claim 18, wherein the second acute angle is equal to the first acute angle.

20. The cover assembly of claim 17, wherein when the cover assembly is viewed axially relative to the rotation center axis of the aforementioned front sprocket, the first connecting structure is positioned on the opposite side of the second connecting structure relative to the rotation center axis.

21. A front sprocket assembly for use in a human-powered vehicle, comprising: the aforementioned front sprocket; and the aforementioned cover assembly as claimed in any one of claims 1 to 20.

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