TW202308899A - Rear derailleur for human-powered vehicle capable of enhancing mounting precision and suppressing vibration of chain guide rail - Google Patents

Abstract

The objective of the invention is to provide a rear derailleur for human-powered vehicle, which may enhance the precision while being mounted on the frame of a human-powered vehicle and suppress the vibration of chain guide rail. The rear derailleur of the invention includes: a base member including a first mounting end and a second mounting end; a movable member movably disposed on the base member; a linkage mechanism for linking the movable member with the base member; a pulley assembly rotatably linked with the movable member, a rotating axle mounted on the pulley assembly and rotatably linked with the movable member; and, a damper structure disposed on the movable member. In which, the first mounting end is mounted coaxially on the rear wheel axle. The second mounting end is mounted on the linkage mechanism. The first mounting end includes a first arm and a second arm, wherein the first arm and the second arm are disposed as being separated in the axial direction of the rear wheel axle. The damper structure is composed for providing the rotational resisting force in the rotating direction of the pulley assembly.

Description

Rear derailleur for human drive vehicles

This disclosure relates to a rear transmission for a human-driven vehicle.

For example, the rear transmission disclosed in Patent Document 1 is mounted on the frame of a human-powered vehicle through two arms. [Prior Art Literature] [Patent Document]

[Patent Document 1] US Patent Application Publication No. 2018/0265169 specification

[Problem to be solved by the invention]

One of the objects of the present disclosure is to provide a rear derailleur for a human-driven vehicle that can improve the accuracy when installed on the frame of the human-driven vehicle and suppress the vibration of the chain guide rail. [Technical means to solve the problem]

According to the first aspect of the present disclosure, the rear derailleur is installed coaxially with the rear wheel axle of the human-driven vehicle, and the above-mentioned rear derailleur includes: a base member, which includes a first mounting end and a second mounting end; a movable member, which is movably arranged The above-mentioned base member; the link mechanism, which connects the above-mentioned movable member to the above-mentioned base member; the pulley assembly, which is rotatably connected to the above-mentioned movable member around the rotation axis; the rotation shaft, which is installed on the above-mentioned pulley assembly. connected to the movable member so as to rotate around the rotation axis; and a damper structure arranged on the movable member around the rotation axis; The second mounting end is installed on the above-mentioned link mechanism, the above-mentioned first mounting end includes a first arm and a second arm, and the above-mentioned first arm and the second arm are arranged in a manner to be separated from each other in the axis direction of the axis of the rear wheel, The damper structure is configured to provide rotational resistance in one rotational direction of the pulley assembly. According to the first aspect, since the transmission is mounted on the frame through the first arm and the second arm, and has a damper structure, the accuracy when mounted on the frame of a human-powered vehicle can be improved, and the vibration of the chain can be suppressed.

In the second and later transmissions according to the first aspect of the present disclosure, the damper structure includes a one-way clutch disposed between the movable member and the rotating shaft. According to the transmission of the second aspect, since the one-way clutch is included, rotation resistance can be effectively resisted against the rotation of the chain guide accompanying vibration of the chain.

In the third and subsequent aspects of the transmission according to the first or second aspect of the present disclosure, the damper structure includes a resistance imparting member movably disposed between the movable member and the rotating shaft, and a resistance providing member in contact with the resistance. The resistance adjusting member of the imparting member, the resistance adjusting member is at least between the first position and the second position, and is rotatably installed on the above-mentioned movable member, and the first rotational resistance and the The second rotational resistance of the resistance adjustment member is different in a state where the resistance adjustment member is located at the second position. According to the rear transmission of the third aspect, the damping force can be easily adjusted. Therefore, the speed change operation of the rear transmission when the human-driven vehicle is running on a road can be smoothly carried out.

In the fourth and subsequent transmissions according to any one of the first to third aspects of the present disclosure, the damper structure is configured to provide frictional resistance in the first rotational direction of the pulley assembly. According to the transmission after the fourth aspect, since the damper structure provides frictional resistance, the damper structure can be downsized.

In the fifth and subsequent transmissions according to any one of the first to third aspects of the present disclosure, the damper structure is configured to provide fluid resistance in the first rotational direction of the pulley assembly. According to the transmission after the fifth aspect, since the damper structure provides fluid resistance, the frequency of maintenance can be reduced.

In the rear transmission of the sixth aspect according to any one of the first to fifth aspects of the present disclosure, the above-mentioned base member includes a structure configured to adjust the angular position of the above-mentioned rear transmission relative to the frame of the above-mentioned human-driven vehicle. Angle position adjustment structure. According to the rear derailleur according to the sixth aspect, since the two arms are attached to the frame, the rear derailleur does not protrude excessively from the frame of the human-powered vehicle, and the rear derailleur can be made highly rigid. Since the derailleur after the sixth aspect includes an angle position adjustment structure, the posture of the rear derailleur relative to the vehicle frame can be easily adjusted.

In the transmission according to the seventh aspect of the sixth aspect of the present disclosure, the angle position adjustment structure includes a bolt member having a first threaded portion, and an adjustment member having a second threaded portion screwed to the first threaded portion. Open your mouth. According to the rear derailleur according to the seventh aspect, since the angle position adjustment structure is included, the attitude of the rear derailleur relative to the vehicle frame can be easily adjusted.

In the rear transmission according to the eighth aspect of any one of the first to seventh aspects of the present disclosure, in the state where the rear transmission is mounted on the human-driven vehicle, the second arm is arranged at a position lower than the first arm. The position closer to the center plane of the axis of the above-mentioned human-driven vehicle. According to the eighth aspect of the rear derailleur, since the rear derailleur does not protrude excessively from the frame of the human-driven vehicle, the rear derailleur is not easily in contact with obstacles, and because there are two arms installed on the frame, the height of the rear derailleur can be increased. Rigid.

In the rear transmission of the ninth aspect according to any one of the first to eighth aspects of the present disclosure, the above-mentioned first arm and the above-mentioned second arm are installed in the state of the above-mentioned human-driven vehicle, and the above-mentioned The frame of the human-powered vehicle is arranged in the direction of the axis of the axis of the rear wheel between the first arm and the second arm. According to the ninth aspect of the rear derailleur, since the rear derailleur does not protrude excessively from the frame of the human-driven vehicle, the rear derailleur is not easy to contact with obstacles, and because there are two arms installed on the frame, the height of the rear derailleur can be increased. Rigid.

In the transmission after the tenth aspect according to any one of the first to ninth aspects of the present disclosure, it is further provided that the above-mentioned first mounting end of the above-mentioned base member is mounted on the frame of the above-mentioned human-powered vehicle. For the fastening member, when the rear transmission is installed on the human-driven vehicle, the fastening central axis of the fastening member is coaxial with the rear wheel axis. According to the tenth aspect of the rear derailleur, since there are two arms attached to the vehicle frame, the rear derailleur can be made highly rigid, and the rear derailleur can be easily attached to and detached from the vehicle frame by the fastening member.

In the transmission according to the eleventh aspect of the tenth aspect of the present disclosure, the fastening member has a cylindrical portion, and a radially protruding portion protruding radially relative to the fastening center axis, and the radially protruding portion is opposite to each other. Extending radially outward from one axial end of the cylindrical portion of the fastening member at the center of the fastening center. According to the eleventh aspect of the rear derailleur, since there are two arms attached to the frame, the rear derailleur can be highly rigid, and the rear derailleur can be easily attached to and detached from the vehicle frame by the fastening member.

In the transmission according to the twelfth and subsequent aspects of the eleventh aspect of the present disclosure, the first arm of the base member has a first mounting opening configured to pass through the cylindrical portion of the fastening member. According to the twelfth aspect of the rear derailleur, since there are two arms attached to the frame, the rear derailleur can be highly rigidized, and the rear derailleur can be easily attached to and detached from the vehicle frame by the fastening member.

In the transmission according to the thirteenth aspect of the twelfth aspect of the present disclosure, the second arm of the base member has a second installation opening configured to at least partially pass through the cylindrical portion of the fastening member. According to the rear derailleur according to the thirteenth aspect, since there are two arms attached to the vehicle frame, the rear derailleur can be highly rigidized, and the rear derailleur can be easily attached to and detached from the vehicle frame by the fastening member.

In the rear derailleur according to the 14th aspect of any one of the 11th to 13th aspects of the present disclosure, in the state where the rear derailleur is mounted on the human-powered vehicle, the second arm is arranged at a lower position than the first arm. At a position closer to the center plane of the axis of the above-mentioned human-driven vehicle, when the above-mentioned rear transmission is installed on the above-mentioned human-driven vehicle, the above-mentioned first arm is arranged on the above-mentioned vehicle frame and the above-mentioned Between the above-mentioned radial protrusions of the fastening member. According to the rear derailleur according to the fourteenth aspect, since the rear derailleur does not protrude excessively from the frame of the human-driven vehicle, the rear derailleur is not easy to contact with obstacles, and because there are two arms installed on the frame, the rear derailleur can be made high. Rigid.

In the transmission according to the fifteenth aspect of any one of the first to the fourteenth aspects of the present disclosure, the above-mentioned pulley assembly includes: at least one of the inner guide plate and the outer guide plate; The chain of the human-powered vehicle is engaged in a chain, and is rotatably installed on at least one of the above-mentioned inner guide plate and the above-mentioned outer guide plate around the axis of the guide wheel; and the tension pulley, which is engaged with the above-mentioned chain. It is constructed in a combined manner, and is rotatably installed on at least one of the above-mentioned inner guide plate and the above-mentioned outer guide plate around the axis of the tensioning pulley away from the axis of the above-mentioned guide wheel; from the axis of the above-mentioned guide wheel to the above-mentioned tension The pulley distance defined by the shaft center of the tight pulley is more than 70 mm. According to the transmission after the fifteenth aspect, the number of gears is more, and it can be applied to a wide range of sprockets.

In the transmission according to the sixteenth aspect of the fifteenth aspect of the present disclosure, the distance between the above-mentioned pulleys is 120 mm or less. According to the rear transmission of the 16th aspect, the ground clearance can be ensured.

In the rear derailleur of the 17th aspect according to the 15th or 16th aspect of the present disclosure, the above-mentioned rear derailleur can be applied to a multi-rear sprocket assembly including more than 12 sprockets. According to the transmission after the 17th aspect, the number of gears is more, and it can be applied to a wide range of sprockets.

In the sprocket according to the 18th aspect of any one of the 1st to 17th aspects of the present disclosure, an axial space is defined between the first arm and the second arm in the axial direction. When the above-mentioned pulley assembly is located at a position corresponding to the smallest sprocket in the multi-rear sprocket assembly, it is perpendicular to the axis of the above-mentioned rear wheel, and when viewed from the direction from the above-mentioned base member to the above-mentioned movable member, the above-mentioned The damper is configured in the direction of the axis to partially overlap the space of the axis. According to the rear derailleur of the eighteenth aspect, since the derailleur does not protrude excessively from the frame of the human-driven vehicle, the rear derailleur is less likely to come into contact with obstacles, and since there are two arms mounted on the frame, the rear derailleur can be highly rigid. change.

In the transmission according to the nineteenth aspect of the second aspect of the present disclosure, an axis center space is defined between the above-mentioned first arm and the above-mentioned second arm in the direction of the axis center, and the above-mentioned pulley assembly is located with multiple rear chains. In the case of the position corresponding to the smallest sprocket in the wheel assembly, it is perpendicular to the axis of the rear wheel axle, and when viewed from the direction from the base member to the movable member, the one-way clutch is in the direction of the axis The upper part overlaps with the space of the above-mentioned axis. According to the rear derailleur of the 19th aspect, since the derailleur does not protrude excessively from the frame of the human-driven vehicle, the rear derailleur is less likely to come into contact with obstacles, and since there are two arms installed on the frame, the rear derailleur can be highly rigid. change. [Effect of Invention]

According to the rear derailleur for a human-driven vehicle of the present disclosure, the accuracy when mounted on the frame of the human-driven vehicle can be improved, and the vibration of the chain guide rail can be suppressed.

＜Example of implementation＞ Referring to Fig. 1 to Fig. 16, a rear derailleur 20 for a human-powered vehicle according to an embodiment will be described. A human-driven vehicle is a vehicle that has at least one wheel and can be driven by human power. Human-powered vehicles include, for example, various types of bicycles such as mountain bikes, road bikes, city bikes, cargo bikes, hand bikes, and recumbent bikes. The number of wheels that a human-powered vehicle has is not limited. Human-powered vehicles also include, for example, unicycles and vehicles with three or more wheels. Human-powered vehicles are not limited to vehicles that can be driven only by human power. Human-powered vehicles include not only human-powered driving force, but also electric bicycles (E-bikes) that use the driving force of electric motors for propulsion. Electric bicycles include electrically assisted bicycles that are propelled assisted by electric motors. Hereinafter, in the embodiment, a human-powered vehicle will be described as a mountain bike.

In this manual, the terms "front (front)", "rear (rear)", "front", "rear", "left", "right", "horizontal", "upper" and "below" indicating the following directions ” and any other terms showing other similar directions refer to those directions determined with reference to the rider facing the handlebars in the reference position (for example, on the saddle or seat) of a human-powered vehicle.

As shown in Figures 1 to 3, a human-powered vehicle has a crank, a front wheel, a rear wheel and a vehicle body. The vehicle body includes a vehicle frame 10 . The crank includes a crankshaft rotatable relative to the frame 10, and crank arms respectively provided at ends of the crankshaft in the axial direction. Connect the pedal to the crank arm. The rear wheels are driven by rotation of a crank. The rear wheel is supported on the vehicle frame 10 . The crank and the rear wheel are connected by a drive mechanism. The driving mechanism includes a sprocket 12 and a chain 14 . Chain wheel 12 fastens rear chain wheel. The drive mechanism includes a plurality of sprockets 12 . The plurality of sprockets 12 constitute a multi-rear sprocket assembly 16 . The drive mechanism in turn includes a sprocket before being coupled to the crankshaft. The front sprocket consists of one or more. The chain 14 transmits the rotational force of the front sprocket to the sprocket 12 .

As shown in FIGS. 1 to 4 , the human-powered vehicle includes a rear transmission 20 . The rear derailleur 20 is configured to change the ratio of the rotation speed of the rear wheel to the rotation speed of the crank, that is, the gear ratio. The rear derailleur 20 can change the ratio of the rotation speeds of the sprocket and the sprocket 12 before the chain 14 interlocks to rotate, that is, the gear ratio. For example, the rear derailleur 20 is applicable to multiple rear sprocket assemblies 16 including more than twelve sprockets 12 . The rear derailleur 20 transfers the chain 14 from one sprocket 12 included in the multi-rear sprocket assembly 16 to the other sprockets 12 .

The rear derailleur 20 is installed concentrically with the rear wheel axle center RC of the human-driven vehicle. The rear derailleur 20 includes a base member 26 including a first mounting end 22 and a second mounting end 24 . The rear derailleur 20 has a movable member 28 configured to be movable relative to a base member 26 . The rear derailleur 20 includes a link mechanism 30 that connects the movable member 28 to the base member 26 . The rear derailleur 20 includes a pulley assembly 32 rotatably connected to the movable member 28 around the rotation axis C. As shown in FIG. The rear derailleur 20 includes a rotating shaft 34 attached to a pulley assembly 32 and connected to the movable member 28 so as to be rotatable around a rotating axis C. As shown in FIG. The rear derailleur 20 is provided with a damper structure 36 disposed on the movable member 28 around the rotary shaft 34 .

The first installation end 22 is installed coaxially with the rear wheel axis RC. The second attachment end 24 is attached to the link mechanism 30 . The first mounting end 22 includes a first arm 38 and a second arm 40 . The first arm 38 and the second arm 40 are arranged so as to be separated from each other in the axis direction X of the rear wheel axis RC. The damper structure 36 is configured to provide rotational resistance in the rotational direction D1 of the pulley assembly 32 . The first arm 38 and the second arm 40 are integrally formed with the base member 26 .

The link mechanism 30 includes a third mounting end 30A and a fourth mounting end 30B. The third mounting end 30A is mounted so as to be rotatable in a direction parallel to the axial direction X with respect to the second mounting end 24 of the base member 26 . The fourth attachment end 30B is attached to the movable member 28 .

The pulley assembly 32 includes a guide wheel 46 configured to engage with at least one of the inner guide plate 42 and the outer guide plate 44 and the chain 14 of the human-driven vehicle. The guide wheel 46 is rotatably attached to at least one of the inner guide plate 42 and the outer guide plate 44 around the guide wheel shaft center GC. The pulley assembly 32 includes a tension pulley 48 configured to engage with the chain 14 .

The tension pulley 48 is rotatably attached to at least one of the inner guide plate 42 and the outer guide plate 44 around the tension pulley axis TC separated from the guide pulley axis GC. For example, the pulley distance PD defined from the guide pulley axis GC to the tension pulley axis TC is 70 mm or more. The guide wheel 46 is configured to guide the chain 14 . The tension pulley 48 is configured to maintain the tension of the chain 14 .

For example, the pulley distance PD is 80 mm or more. For example, the pulley distance PD is 85 mm or more. For example, the pulley distance PD is 90 mm or more. For example, the pulley distance PD is 95 mm or more. For example, the pulley distance PD is 98 mm or more. For example, the pulley distance PD is 100 mm or more. For example, the pulley distance PD is 120 mm or less. For example, the pulley distance PD is 115 mm or less. For example, the pulley distance PD is 110 mm or less.

Most previous rear sprocket assemblies generally contain less than 11 sprockets. When the multi-rear sprocket assembly 16 includes more than 12 sprockets 12, the difference between the size of the smallest sprocket and the largest sprocket is greater than the size of the smallest sprocket and the largest sprocket in the previous multi-rear sprocket assembly. The difference in the size of the sprockets.

When the multi-rear sprocket assembly 16 includes more than 12 sprockets 12, when the chain 14 is engaged with the smallest sprocket, the chain 14 wound by the rear derailleur 20 or the pulley assembly 32 must be wound. Longer than a chain provided on a human-powered vehicle having a multi-rear sprocket assembly comprising less than 11 pulleys. Therefore, in the multi-rear sprocket assembly 16 including 12 or more sprockets 12, in order to wind the chain 14, the pulley distance PD must be longer than that for the multi-rear sprocket assembly including 11 or less sprockets. transmission.

Because the distance PD of the pulleys in this embodiment is more than 70 mm, it can be preferably wound around the chain 14 of the rear sprocket assembly 16 that includes more than 12 sprockets 12 .

The movable member 28 shown in FIGS. 4 to 8 includes a housing 50 and a link mechanism mounting portion 52 . The housing 50 is integrally formed with the link mechanism mounting portion 52 . The link mechanism mounting portion 52 can also be formed separately from the housing 50 . The damper structure 36 is arranged in the inner space of the casing 50 . The link mechanism mounting portion 52 is mounted on the fourth mounting end 30B of the link mechanism 30 .

For example, the damper structure 36 includes a resistance imparting member 54 and a resistance adjusting member 56 . The resistance imparting member 54 is movably disposed between the movable member 28 and the rotation shaft 34 . The resistance adjusting member 56 is in contact with the resistance imparting member 54 . For example, the resistance adjustment member 56 is rotatably attached to the movable member 28 at least between the first position and the second position. For example, the first rotational resistance when the resistance adjusting member 56 is located at the first position is different from the second rotational resistance when the resistance adjusting member 56 is located at the second position. For example, the first rotational resistance is greater than the second rotational resistance.

The resistance imparting member 54 is formed in a belt shape. The resistance imparting member 54 is wound, for example, around the outer periphery of the one-way clutch 64 in the circumferential direction. Each end portion 54A of the resistance imparting member 54 is arranged between the cam portion 62 of the resistance adjusting member 56 and the adjustment mechanism 60B.

The resistance adjusting member 56 includes a handle 58 and a cam unit 60 . The handle 58 includes a handle portion 58A and a first shaft member 58B. The cam unit 60 includes a cam portion 62, a support member 60A, and an adjustment mechanism 60B. The handle 58 is formed independently of the cam unit 60 and is configured to rotate integrally. The first shaft member 58B has, for example, a square prism shape. The first shaft member 58B has, for example, a cylindrical shape. For example, the first shaft member 58B is provided in the first through hole 60C of the cam portion 62 . The cam unit 60 may not include the adjustment mechanism 60B. The cam portion 62 is supported by the supporting member 60A.

For example, the axis direction of the rotation center axis of the handle 58 is parallel to the axis direction X. The axis direction of the rotation center axis of the handle 58 may also be non-parallel to the axis direction X. When the resistance adjustment member 56 is located at the first position, the handle portion 58A is located at the first operation position. When the resistance adjusting member 56 is located at the second position, the handle portion 58A is located at the second operation position. The cam portion 62 includes a first portion 62A and a second portion 62B. The substantial radius of the first portion 62A is larger than the substantial radius of the second portion 62B. When the resistance adjusting member 56 is located at the first position, the first portion 62A comes into contact with the resistance providing member 54 , and the resistance providing member 54 locks the outer peripheral portion of the one-way clutch 64 . When the resistance adjusting member 56 is at the second position, the second portion 62B is in contact with the resistance imparting member 54, and the locking of the resistance imparting member 54 on the outer periphery of the one-way clutch 64 is the same as when the resistance adjusting member 56 is at the first position. Relatively loose.

The adjustment mechanism 60B includes a threaded portion 60D and a contact portion 60E. The contact portion 60E is in contact with the resistance imparting member 54 . The housing 50 of the movable member 28 includes a communication portion 50A that can communicate with the threaded portion 60D from the outside. The communicating portion 50A is configured so that a tool can be inserted, for example. The threaded portion 60D has a hole for inserting a hexagon wrench. The threaded portion 60D may also have a hole for inserting a Phillips screwdriver or a flat-head screwdriver. For example, the adjustment mechanism 60B changes the locking force of the contact portion 60E on the outer peripheral portion of the one-way clutch 64 of the resistance imparting member 54 by rotating the threaded portion 60D with a hexagonal wrench. For example, when the resistance adjusting member 56 is located at the first position, the resistance provided by the resistance providing member 54 can be adjusted by the adjustment mechanism 60B.

For example, the damper structure 36 includes a one-way clutch 64 disposed between the movable member 28 and the rotating shaft 34 . For example, when the movable member 28 rotates in the rotation direction D1 with respect to the rotation axis C, the rotation shaft 34 and the one-way clutch 64 rotate integrally. For example, in FIG. 7 , the rotation direction D1 is counterclockwise relative to the rotation axis C. As shown in FIG. For example, when the movable member 28 rotates in the rotation direction D2 with respect to the rotation axis C, the rotation shaft 34 and the one-way clutch 64 rotate relative to each other. For example, the rotation direction D2 is clockwise with respect to the rotation axis C. As shown in FIG. For example, the one-way clutch 64 is a roller clutch.

As shown in FIGS. 7 and 9 to 11 , the one-way clutch 64 includes the rotating shaft 34 , an outer ring member 66 , a plurality of rollers 68 , and a roller holding member 70 . The outer peripheral surface 34A of the rotating shaft 34 has a smooth circular shape. The rotating shaft 34 includes a first end portion 34B and a second end portion 34C. For example, the rotary shaft 34 constitutes the inner wheel of the one-way clutch 64 . For example, the second end portion 34C constitutes the inner wheel of the one-way clutch 64 . A plurality of grooves 66B are formed on the inner peripheral surface 66A of the outer ring member 66 . A plurality of rollers 68 are arranged in the plurality of grooves 66B. The outer wheel member 66 constitutes the outer wheel of the one-way clutch 64 .

The roller holding member 70 includes an upper positioning ring 70A, a lower positioning ring 70B, a plurality of positioning columns 70C, and a spring assembly 72 . The roller holding member 70 is formed of resin. The roller holding member 70 is configured so that each of the plurality of rollers 68 is located in each of the plurality of grooves 66B. The plurality of grooves 66B are formed in a tapered shape. The upper positioning ring 70A and the lower positioning ring 70B are formed in a ring shape. The plurality of positioning columns 70C are formed in a cylindrical shape, for example. The plurality of positioning columns 70C are arranged in the circumferential direction between the upper positioning ring 70A and the lower positioning ring 70B. One or more rollers 68 are disposed between one of the plurality of positioning columns 70C and the other of the plurality of positioning columns 70C.

The spring assembly 72 includes a disc-shaped top plate portion 72A, and a plate spring portion 72B disposed on the circumference of the top plate portion 72A. The plate spring portion 72B is inserted between the upper positioning ring 70A and the lower positioning ring 70B from a plurality of holes formed in the upper portion of the upper positioning ring 70A toward the lower positioning ring 70B. The plate spring portion 72B energizes each of the plurality of rollers 68 in the rotation direction D2, for example.

An anti-rotation member 70E is arranged at an end 70D of each of the plurality of positioning posts 70C. The anti-rotation member 70E restrains the plurality of rollers 68 from rotating by friction. When the one-way clutch 64 rotates in the rotation direction D1, the anti-rotation member 70E suppresses the rotation of each of the plurality of rollers 68 .

The rotating shaft 34, the damper structure 36, the coil spring 74, etc. are arranged in the internal space of the housing 50 of the movable member 28. As shown in FIG. The pulley assembly 32 is mounted on the movable member 28 via a mounting member 76 . The mounting member 76 includes a third end portion 76A, a fourth end portion 76B, and a rotating shaft engagement portion 76C. A hole 76D is provided in the third end portion 76A. For example, hole 76D has a shape for insertion of a hex wrench. The hole 76D faces the outer space of the housing 50 of the movable member 28 . A first external thread portion 76E is provided on the third end portion 76A. The first external thread portion 76E is engaged with the first internal thread portion 44B provided in the second through hole 44A of the outer guide plate 44 .

The rotating shaft engagement portion 76C is provided between the third end portion 76A and the fourth end portion 76B of the attachment member 76 . 76 C of 2nd external thread parts are provided in the rotating shaft engagement part 76C. A second internal thread portion 34D is provided on the first end portion 34B of the rotating shaft 34 . The second external thread portion 76F is engaged with the second internal thread portion 34D.

The fifth end portion 74A of the coil spring 74 is attached to the first coil spring attachment portion 44C of the outer guide plate 44 . The sixth end portion 74B of the coil spring 74 is attached to the second coil spring attachment portion 50B located in the inner space of the casing 50 of the movable member 28 . The coil spring 74 energizes the outer guide plate 44 toward the rotation axis C clockwise.

In this embodiment, the damper structure 36 is configured to provide frictional resistance in the rotational direction D1 of the pulley assembly 32 . The damper structure 36 provides frictional resistance by, for example, locking the one-way clutch 64 with the resistance imparting member 54 . Since the damper structure 36 is configured to provide frictional resistance, it can be realized with a simple structure. Therefore, the damper structure 36 can be miniaturized.

When the human-driven vehicle is driving in the field, when viewed from the right side of the human-driven vehicle, a counterclockwise rotational force relative to the rotation axis C is applied to the rear derailleur 20 . When the counterclockwise rotational force with respect to the rotational axis C is greater than the energizing force of the coil spring 74, the movable member 28 rotates in the rotational direction D1, and the chain 14 bends. The damper configuration 36 provides frictional resistance in the direction of rotation D1. Therefore, the rotation of the movable member 28 in the rotation direction D1 can be suppressed by friction.

For example, the base member 26 includes an angular position adjustment structure 78 configured to adjust the angular position of the rear derailleur relative to the frame 10 of the above-mentioned human-driven vehicle. The angular position adjustment structure 78 is configured to adjust the angular position of the rear derailleur 20 relative to the frame 10 by rotating the first arm 38 and the second arm 40 around the rear wheel axis RC. The angular position adjustment structure 78 adjusts the angular position of the rear derailleur 20 by adjusting the angular position of the base member 26 relative to the frame 10 .

For example, the angle position adjustment structure 78 includes a bolt member 80 having a first threaded portion 80A, and an adjustment opening 82 having a second threaded portion 82A screwed to the first threaded portion 80A. The first thread portion 80A includes, for example, external threads. The second thread portion 82A includes, for example, internal threads. The relative positions of the first threaded portion 80A and the second threaded portion 82A are changed by the rotation of the bolt member 80 . A structure for rotating the bolt member 80 is provided on the bolt head portion 80B of the bolt member 80 . For example, a hole for a Phillips or flathead screwdriver, or a hole for a hex wrench.

As shown in FIG. 12 , an abutment surface 10A is formed at the rear end portion of the body frame 10 on which the rear derailleur 20 is mounted. The contact surface 10A is configured such that a part protrudes, for example. The angular position of the rear derailleur 20 relative to the vehicle frame 10 is changed and determined by the end of the bolt member 80 contacting the contact surface 10A. The contact surface 10A is configured such that a part protrudes, for example. The angular position of the rear derailleur 20 relative to the frame 10 is changed and determined by the end of the first threaded portion 80A in contact with the contact surface 10A. The abutment surface 10A that the bolt member 80 comes into contact with is configured to protrude toward the lower side of the human-powered vehicle than the line connecting the rear wheel axis RC and the front wheel axis. The end portion of the bolt member 80 in contact with the contact surface 10A may be formed of a material other than metal. For example, the end portion is made of resin or elastomer.

As shown in Figures 1 to 3 and Figures 12 to 16, for example, the first arm 38 and the second arm 40 are configured such that the rear transmission 20 is mounted on a manpower-driven vehicle, and the vehicle frame 10 of the human-powered vehicle is behind The wheel shaft center RC is disposed between the first arm 38 and the second arm 40 in the axial direction X. The axis direction X of the rear wheel axis RC is consistent with the left-right direction of the human-driven vehicle. The first arm 38 has a first mounting opening 38A through which the rear wheel axis RC coaxially passes through when the rear derailleur 20 is mounted on the human-powered vehicle. The second arm 40 has a second mounting opening 40A through which the rear wheel shaft center RC coaxially passes through when the rear derailleur 20 is mounted on the human-powered vehicle. The frame 10 has a frame opening 10B through which the rear wheel axis RC coaxially passes.

The angular position adjustment structure 78 is provided between the first installation opening 38A and the second installation end 24 in the radial direction of the rear wheel axis RC. The angular position adjustment structure 78 is provided between the second installation opening 40A and the second installation end 24 in the radial direction of the rear wheel axis RC. The angular position adjustment structure 78 is provided between the first installation opening 38A and the second installation end 24 in the radial direction of the rear wheel axis RC. The angular position adjustment structure 78 is provided between the first mounting opening 38A and the second mounting opening 40A in the axis direction X of the rear wheel axis RC. The angular position adjustment structure 78 is disposed on the arm connecting portion 26A connected to the first arm 38 and the second arm 40 .

For example, when the rear derailleur 20 is mounted on a human-powered vehicle, the second arm 40 is arranged at a position closer to the axial center plane A of the human-powered vehicle than the first arm 38 . The axis center plane A of the human-driven vehicle is a plane along the central axis, and the central axis is along the front-back direction of the human-driven vehicle. The axis center plane A of the human-driven vehicle is perpendicular to the axis direction X of the rear wheel axis RC.

For example, the rear derailleur 20 further includes a fastening member 84 . The fastening member 84 is configured to attach the first mounting end 22 of the base member 26 to the frame 10 of the human-powered vehicle. In the state where the rear transmission 20 is mounted on a human-driven vehicle, the fastening center axis FC of the fastening member 84 is coaxial with the rear wheel axis RC. For example, the fastening member 84 has a cylindrical portion 86 and a radial protrusion 88 protruding radially with respect to the fastening center axis FC. The radial protrusion 88 extends radially outward from an axial end 86A of the cylindrical portion 86 of the fastening member 84 relative to the fastening center axis FC.

For example, the first arm 38 of the base member 26 has a first attachment opening 38A formed so that the cylindrical portion 86 of the fastening member 84 penetrates therethrough. The first installation opening 38A is provided in a state where the rear derailleur 20 is installed on the human-powered vehicle, so that the rear wheel axle center RC is coaxial with the first installation opening 38A. The first arm 38 of the base member 26 has a first minimum radial thickness H1 around the first installation opening 38A when the rear wheel axle center RC is mounted on the human-driven vehicle with respect to the rear derailleur 20 .

For example, the second arm 40 of the base member 26 has a second attachment opening 40A configured to at least partially penetrate the cylindrical portion 86 of the fastening member 84 . The second mounting opening 40A is formed so that the rear wheel axis RC can pass through the second mounting opening 40A coaxially with the rear derailleur 20 mounted on the human-powered vehicle. The second arm 40 has a second minimum radial thickness H2 around the second mounting opening 40A in a state where the rear wheel axis RC is mounted on the human-driven vehicle with respect to the rear derailleur 20 .

For example, when the rear derailleur 20 is mounted on a human-powered vehicle, the second arm 40 is arranged at a position closer to the axial center plane A of the human-powered vehicle than the first arm 38 . When the rear derailleur 20 is installed on the human-powered vehicle, the first arm 38 is disposed between the vehicle frame 10 and the radially protruding portion 88 of the fastening member 84 in the axis direction X of the rear wheel axis RC.

The first minimum radial thickness H1 is the thickness of the thinnest part of the first arm 38 constituting the first installation opening 38A. The second minimum radial thickness H2 is the thickness of the thinnest part of the second arm 40 constituting the second mounting opening 40A.

For example, at least one of the first minimum radial thickness H1 and the second minimum radial thickness H2 is 2 mm or more. For example, both of the first minimum radial thickness H1 and the second minimum radial thickness H2 are 2 mm or more. For example, at least one of the first minimum radial thickness H1 and the second minimum radial thickness H2 is 2.5 mm or more. For example, both of the first minimum radial thickness H1 and the second minimum radial thickness H2 are 2.5 mm or more.

For example, an axial center space M is defined between the first wall 38 and the second wall 40 in the axial direction X. As shown in FIG. When the pulley assembly 32 is located at a position corresponding to the smallest sprocket 12 in the multi-rear sprocket assembly 16, it is perpendicular to the rear wheel axis RC and viewed from the direction E from the base member 26 to the movable member 28. In some cases, the damper structure 36 partially overlaps with the axial center space M in the axial direction X.

For example, an axial center space M is defined between the first wall 38 and the second wall 40 in the axial direction X. As shown in FIG. When the pulley assembly 32 is located at a position corresponding to the smallest sprocket 12 in the multi-rear sprocket assembly 16, it is perpendicular to the rear wheel axis RC and viewed from the direction E from the base member 26 to the movable member 28. In some cases, the one-way clutch 64 partially overlaps with the axial center space M in the axial direction X.

The angular position adjustment structure 78 is arranged between the first arm 38 and the second arm 40 in the axis direction X of the rear wheel axis RC.

A sliding portion S is formed on at least one of the contact surface between the rear wheel hub axle 90 and the base member 26 and the contact surface between the fastening member 84 and the base member 26 . The sliding portion S is formed, for example, on at least one of the contact surface between the rear wheel hub axle 90 and the second arm 40 and the contact surface between the second arm 40 and the cylindrical portion 86 .

For example, the sliding portion S is formed to have a thickness of 0.2 mm or more in the axis direction X of the rear wheel axis RC. For example, the sliding portion S is formed of a material different from the materials constituting the fastening member 84 , the rear wheel hub shaft 90 , and the base member 26 . For example, the sliding portion S is made of a material excellent in low friction and wear resistance. For example, the material constituting the sliding portion S is resin. For example, the material constituting the sliding portion S is a fluororesin. The fluororesin system is, for example, polytetrafluoroethylene or perfluoroalkoxyalkane (PFA (Perfluoroalkoxy alkane)).

The sliding part S improves the slidability of each constituent element. The sliding portion S may also be a surface treatment to the contact surfaces of each of the fastening member 84 , the rear wheel hub axle 90 , and the base member 26 . For example, the layer structure of the sliding part S is composed of at least one of aluminum oxide film treatment in which the contact surface is covered with an oxide film, and fluororesin processing. Fluororesin processing includes coating and attaching of fluororesin.

According to the rear transmission 20 of the embodiment, the following effects can be further obtained. At least one of between the rear wheel hub axle 90 and the base member 26 and between the fastening member 84 and the base member 26 forms a layer structure. The part composed of the layer structure improves the sliding property. Therefore, abrasion of each component is suppressed.

＜Changed example＞ The description of the embodiment is an illustration of the form that the transmission can take after the present disclosure, and is not intended to limit the form. According to the present disclosure, the transmission can take, for example, variations of the embodiments shown below, and a combination of at least two variations that are not contradictory. In the following modification examples, the same symbols as those in the embodiments are attached to the parts that are in common with those in the embodiments, and descriptions thereof are omitted.

• The damper structure 36 can also be constructed in such a way as to provide fluid resistance in the rotational direction D1 of the pulley assembly 32 . For example, fluid system oil. For example, the damper configuration is a 36-series hydraulic damper. In the case where the damper structure 36 is configured to provide fluid resistance, wear of the parts is less likely to occur, so the maintainability is excellent. As shown in FIGS. 17 and 18 , the damper structure 36 has a piston 92 , a piston support portion 92A, a rotating shaft 94 , and a housing 96 . The piston 92 is supported by the piston support portion 92A. Housing 96 includes fluid chamber 96A and protrusion 96B. The rotating shaft 94 includes a hole 94A through which the piston 92 is inserted, a semicircular portion 94B in contact with the protrusion 96B of the case 96, and a hole 94C through which a fluid passes. The surface of the semicircular portion 94B has a smooth shape. The protrusion 96B moves smoothly on the circumference of the semicircle 94B. The housing 96 is connected to the movable member 28 . The rotating shaft 94 is connected to the pulley assembly 32 . The rotating shaft 94 rotates integrally with the pulley assembly 32 around the rotating axis C. When the pulley assembly 32 rotates in the rotational direction D1 relative to the movable member 28 , the fluid in the fluid chamber 96A moves the piston 92 in a direction in which the flange portion of the piston 92 closes the hole 94C. Movement of fluid through bore 94C is inhibited by the flanged portion of piston 92 . If the flange portion of the piston 92 blocks the hole 94C, the fluid moves through the gap between the semicircular portion 94B and the protrusion 96B, so the pulley assembly 32 is difficult to move due to fluid resistance. When the pulley assembly 32 rotates in the other rotation direction D2 of the pulley assembly 32 relative to the movable member 28 , the fluid in the fluid chamber 96A moves the piston 92 toward the direction in which the flange portion of the piston 92 opens the hole 94C. Fluid resistance to movement of pulley assembly 32 is reduced by allowing movement of fluid through bore 94C. Therefore, the pulley assembly 32 is easy to move in the rotation direction D2.

- Switching of the frictional resistance given to the resistance adjusting member 56 can also be performed by an electric actuator. In this case, an electric actuator is provided instead of the handle 58 or in addition thereto. The electric actuator is configured to rotate the cam unit 60 with respect to the rotation axis C. As shown in FIG.

The expression "at least one" used in this specification means "more than one" of the desired options. As an example, the expression "at least one" used in this specification means "only one option" or "both of the two options" if the number of options is two. As another example, the expression "at least one" used in this specification means "only one option" or "a combination of two or more arbitrary options" if the number of options is three or more.

10: Frame 10A:Abutment surface 10B: frame opening 12: sprocket 14: chain 16: Multiple rear sprocket assembly 20: Rear derailleur 22: The first installation end 24: The second installation end 26: Base member 26A: Arm connection part 28: Movable components 30: Linkage 30A: The third installation end 30B: The 4th installation end 32: pulley assembly 34: Rotation axis 34A: Outer peripheral surface 34B: 1st end 34C: 2nd end 34D: The second internal thread part 36: Damper structure 38: 1st arm 38A: 1st installation opening 40: 2nd arm 40A: 2nd installation opening 42: Inner guide plate 44: Outer guide plate 44A: 2nd through hole 44B: 1st internal thread part 44C: 1st coil spring mounting part 46: guide wheel 48:Tension pulley 50: shell 50A: Connecting part 50B: 2nd coil spring mounting part 52: Link mechanism installation part 54: resistance imparting member 54A: end 56: resistance adjustment member 58: handle 58A: handle part 58B: 1st axis member 60: Cam unit 60A: Support member 60B: Adjustment mechanism 60C: 1st through hole 60D: threaded part 60E: contact part 62: cam part 62A: Part 1 62B: Part 2 64: One-way clutch 66: Outer wheel component 66A: inner peripheral surface 66B: Groove 68: Roller 70: Roller holding member 70A: positioning ring 70B: Lower positioning ring 70C: positioning column 70D: end 70E: anti-rotation member 72: spring assembly 72A: top plate 72B: Plate spring part 74: coil spring 74A: 5th end 74B: 6th end 76: Install components 76A: 3rd end 76B: 4th end 76C: Rotary shaft engaging part 76D: hole 76E: 1st external thread part 76F: The second external thread part 78: Angle position adjustment structure 80: bolt member 80A: 1st threaded part 80B: Bolt head 82:Adjust opening 82A: 2nd thread part 84: fastening member 86: cylindrical part 86A: shaft end 88:Radial protrusion 90: rear wheel hub axle 92: Piston 92A: Piston support part 94: axis of rotation 94A: hole 94B: Semicircle 94C: hole 96: shell 96A: Fluid chamber 96B: protrusion A: Center plane of axis C: Center of rotation D1: Direction of rotation D2: Direction of rotation E: Direction FC: fastening center axis H1: Thickness H2: Thickness GC: guide wheel axis M: axis space PD: pulley distance RC: Rear wheel axle center S: sliding part TC: Tensioning pulley axis X: axis direction

Fig. 1 is a front view showing the periphery of the axle of the rear wheel of a human-driven vehicle including a rear transmission for a human-driven vehicle according to an embodiment. Fig. 2 is a perspective view showing the periphery of the axle of the rear wheel of the human-driven vehicle including the rear transmission for the human-driven vehicle of Fig. 1 . Fig. 3 is a plan view showing the periphery of the axle shaft of the rear wheel of the human-driven vehicle including the rear transmission for the human-driven vehicle of Fig. 1 . Fig. 4 is the front view of the transmission behind the human-powered vehicle of Fig. 1. Fig. 5 is a top view of the structure of the damper in Fig. 4 . Fig. 6 is a bottom view of the damper structure in Fig. 4 . FIG. 7 is a side view of the damper structure of FIG. 4 . Fig. 8 is a side view of a state where the casing of the movable member and the supporting member are removed from the damper structure of Fig. 7 . Fig. 9 is a sectional view of the movable member along line D9-D9 of Fig. 5 . Fig. 10 is a perspective view of the upper positioning ring, the lower positioning ring, the positioning post, the anti-rotation member, and the spring assembly of the damper structure in Fig. 7 . Fig. 11 is a sectional view of the movable member along line D11-D11 in Fig. 7 . Fig. 12 is a diagram showing the rear end portion of the frame of the human-powered vehicle of Fig. 2 . FIG. 13 is a perspective view showing the position of the angle position adjustment structure of the base member in FIG. 2 . FIG. 14 is a rear view showing the position of the angle position adjustment structure of the base member of FIG. 2 . Fig. 15 is the cross-sectional view of the axle, vehicle frame and arm of the rear wheel along the rear wheel axis of Fig. 2. Fig. 16 is a partially enlarged view of the periphery of the arm of Fig. 15 . Fig. 17 is a cross-sectional view of a damper structure of a modification. Fig. 18 is a cross-sectional view of the damper structure in Fig. 18 in which the rotating shaft rotates toward one side of the rotating direction.

20: Rear derailleur

22: The first installation end

24: The second installation end

26: Base member

28: Movable components

30: Linkage

30A: The third installation end

30B: The 4th installation end

32: pulley assembly

38: 1st arm

42: Inner guide plate

44: Outer guide plate

46: guide wheel

48:Tension pulley

50: shell

52: Link mechanism installation part

84: fastening member

C: Center of rotation

M: axis space

RC: Rear wheel axle center

TC: Tensioning pulley axis

Claims (19)

a rear derailleur installed concentrically with the rear wheel axle of the human-driven vehicle, and The above mentioned rear derailleur has: a base member comprising a first mounting end and a second mounting end; a movable member movably disposed on the base member; a link mechanism connecting the movable member to the base member; a pulley assembly rotatably connected to the movable member around a rotation axis; a rotating shaft mounted on the pulley assembly and connected to the movable member so as to be rotatable around the rotating axis; and a damper structure arranged on the movable member around the rotating shaft; and The above-mentioned first installation end is installed on the coaxial center with the above-mentioned rear wheel axle center, The second mounting end is mounted on the link mechanism, The first mounting end includes a first arm and a second arm, The first arm and the second arm are arranged so as to be separated from each other in the direction of the axis of the axis of the rear wheel, The damper structure is configured to provide rotational resistance in one rotational direction of the pulley assembly. Such as the transmission after request item 1, wherein The damper structure includes a one-way clutch disposed between the movable member and the rotating shaft. Such as the transmission after claim item 1 or 2, wherein The damper structure includes a resistance imparting member movably disposed between the movable member and the rotating shaft, and a resistance adjusting member in contact with the resistance imparting member, The resistance adjustment member is rotatably attached to the movable member at least between the first position and the second position, The first rotational resistance when the resistance adjusting member is located at the first position is different from the second rotational resistance when the resistance adjusting member is located at the second position. Such as the transmission after claim item 1 or 2, wherein The above-mentioned damper structure is configured to provide frictional resistance in the above-mentioned one rotation direction of the above-mentioned pulley assembly. Such as the transmission after claim item 1 or 2, wherein The above-mentioned damper structure is configured to provide fluid resistance in the above-mentioned one rotation direction of the above-mentioned pulley assembly. The rear derailleur according to claim 1 or 2, wherein the base member includes an angular position adjustment structure configured to adjust the angular position of the rear derailleur relative to the frame of the human-driven vehicle. The transmission according to Claim 6 or later, wherein the angle position adjustment structure includes a bolt member having a first threaded portion, and an adjustment opening having a second threaded portion screwed to the first threaded portion. The rear transmission according to claim 1 or 2, wherein when the rear transmission is installed on the human-driven vehicle, the second arm is arranged at a position closer to the center plane of the axis of the human-driven vehicle than the first arm. Such as the transmission after claim item 1 or 2, wherein The above-mentioned first arm and the above-mentioned second arm are configured such that, in the state where the above-mentioned rear transmission is installed on the above-mentioned human-driven vehicle, the frame of the above-mentioned human-driven vehicle is arranged on the above-mentioned first arm in the direction of the axis of the axis of the rear wheel. arm and the second arm above. If the transmission after claim item 1 or 2, it further has: A fastening member configured to mount the first mounting end of the base member to the frame of the human-powered vehicle, and In the state where the rear derailleur is mounted on the human-driven vehicle, the fastening center axis of the fastening member is coaxial with the rear wheel axis. The transmission according to claim 10, wherein the fastening member has a cylindrical portion and a radially protruding portion protruding radially relative to the central axis of the fastening, and The radial protruding portion extends radially outward from one axial end of the cylindrical portion of the fastening member relative to the fastening central axis. Such as the transmission after claim item 11, wherein The said 1st arm of the said base member has the 1st attachment opening comprised so that the said cylindrical part of the said fastening member may penetrate. Such as the transmission after claim item 12, wherein The second arm of the base member has a second attachment opening configured to at least partially pass through the cylindrical portion of the fastening member. Such as the transmission after claim item 11, wherein In the state where the rear derailleur is mounted on the human-powered vehicle, the second arm is arranged at a position closer to the center plane of the axis of the human-powered vehicle than the first arm, In the state where the rear derailleur is mounted on the human-driven vehicle, the first arm is arranged between the vehicle frame and the radially protruding portion of the fastening member in the axial direction of the rear wheel axis. As in the transmission after claim item 1 or 2, wherein the pulley assembly includes: At least one of inner guide plate and outer guide plate; A guide wheel, which is configured to engage with the chain of the above-mentioned human-driven vehicle, and is rotatably mounted on at least one of the above-mentioned inner guide plate and the above-mentioned outer guide plate around the axis of the guide wheel; and A tensioning pulley configured to engage with the aforementioned chain, and rotatably mounted on at least one of the aforementioned inner guide plate and the aforementioned outer guide plate around the axis of the tensioning pulley away from the axis of the aforementioned guide wheel; and The pulley distance defined from the axis of the above-mentioned guide pulley to the axis of the above-mentioned tensioning pulley is more than 70 mm. The transmission after claim item 15, wherein the distance between the pulleys is less than 120 mm. As the rear transmission of claim 15, wherein the above-mentioned rear transmission can be applied to a multi-rear sprocket assembly comprising more than 12 sprockets. A transmission according to claim 1 or 2, wherein an axial space is defined between the first arm and the second arm in the direction of the axis, When the above-mentioned pulley assembly is located at a position corresponding to the smallest sprocket in the multi-rear sprocket assembly, it is perpendicular to the axis of the above-mentioned rear wheel, and when viewed from the direction from the above-mentioned base member to the above-mentioned movable member, The above-mentioned damper is configured to partially overlap with the above-mentioned shaft-center space in the above-mentioned axis-center direction. A transmission according to claim 2, wherein an axial center space is defined between the first arm and the second arm in the axial direction, When the above-mentioned pulley assembly is located at a position corresponding to the smallest sprocket in the multi-rear sprocket assembly, it is perpendicular to the axis of the above-mentioned rear wheel, and when viewed from the direction from the above-mentioned base member to the above-mentioned movable member, The above-mentioned one-way clutch partially overlaps with the above-mentioned shaft-center space in the above-mentioned shaft-center direction.

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