TWM480513U - Pulley component and derailleur for bike - Google Patents

Description

Pulley assembly and bicycle shifting device

The present invention relates to a pulley assembly mountable to a bicycle and a bicycle shifting device including the same.

A known rear derailleur (for example, Japanese Patent Laid-Open No. Hei 5-69878) guides a chain from a first sprocket to a second chain having a different number of teeth than the first sprocket by a pulley assembly, that is, a chain guide. wheel. A known pulley assembly includes a first support member and a second support member that are disposed to face each other, a support shaft that is fixed to the first support member and the second support member, and a pulley that is rotatably coupled to the support shaft. The support shaft supports the pulley so as to be rotatable, and connects the first support member and the second support member.

In the conventional pulley unit, since the pulley is rotatably supported by the support shaft, the interval between the support of the pulley is shortened, and the pulley is inclined from a plane orthogonal to the axial direction of the support shaft, and the pulley is swayed.

The subject of this new type is about the pulley assembly, which is to reduce slippage. The shaking of the wheel.

The pulley assembly of the present invention can be mounted on a bicycle. The pulley assembly includes a first support member, a second support member, and a pulley. The first support member includes a first support portion. The second support member includes a second support portion that is disposed to face the first support portion. The pulley includes a support shaft that is rotatably supported by both ends of the first support portion and the second support portion.

In the pulley assembly, the pulley is rotatably supported by the support shaft, and the pulley includes a support shaft, and the support shaft is rotatably supported by the both ends and the second support portion. Therefore, the pulley does not incline with respect to the support shaft, and the support interval of the pulley becomes long. This makes it difficult to tilt the pulley and reduces the sway of the pulley.

The first support member and the second support member may be made of aluminum. In this case, the weight reduction of the entire pulley assembly can be achieved.

The first support member and the second support member may be made of synthetic resin. In this case, further reduction in weight of the entire pulley assembly can be achieved, and corrosion resistance can be improved.

At least one of the first support member and the second support member may be made of aluminum, and the other may be made of synthetic resin. In this case, among the first support member and the second support member, a support member on the foreign matter side such as liquid or dust that bounces from the road surface due to the wheel is easily attached (for example, a support member close to the frame side when attached to the frame) It is made of synthetic resin, and it can be made into aluminum in order to maintain the strength of the support member which is not easy to adhere. Maintain strength and improve corrosion resistance.

The support shaft can also be made of iron. In this case, since the strength of the support shaft is increased, the support shaft is tapered, and the pulley assembly can be downsized.

The first support portion and the second support portion may include a rolling bearing that rotatably supports the support shaft. In this case, since the support shaft is rotatably supported by the rolling bearing, the rotation resistance of the support shaft can be reduced, and the load acting on the chain engaged with the pulley can be reduced.

The first support portion and the second support portion may have a sealing member that seals the rolling bearing. In this case, since the foreign matter does not easily intrude into the rolling bearing, the rotation performance of the rolling bearing is not easily lowered.

The other bicycle shifting machine of the present invention can be mounted on a bicycle. The bicycle speed changer includes a base member, a pulley assembly, a moving member, and a coupling mechanism. The base member can be mounted to a bicycle. The pulley assembly is of the configuration described above and is movable relative to the base member. The moving member rotatably supports the pulley assembly. The coupling mechanism connects the moving member to the base member such that the moving member is movable relative to the base member.

In this transmission, a bicycle speed changer that achieves the above-described effects can be obtained.

The pulley assembly can also selectively guide the chain to a plurality of sprocket wheels having different numbers of teeth arranged in the direction of the rotation axis of the wheel. In this case, the rear derailleur that achieves the above-described effects can be obtained by selectively guiding the chain to the rear derailleur of the plurality of sprockets.

With the present invention, the pulley assembly can reduce the sway of the pulley.

2‧‧‧ rear derailleur

10‧‧‧Base member

12, 112, 212, 312‧‧‧ pulley assemblies

14‧‧‧moving components

16‧‧‧Linked institutions

20, 220, 320‧‧‧1st support member

20a, 220a, 320a‧‧‧1st support

21b‧‧‧1st rolling bearing

22, 222, 322‧‧‧2nd support member

22a, 222a, 322a‧‧‧2nd support

23b‧‧‧2nd rolling bearing

24, 124‧‧‧ support shaft

26, 126‧‧‧ pulley

221g‧‧‧1st sealing member (an example of a sealing member)

223g‧‧‧Second sealing member (an example of a sealing member)

R1-R10‧‧‧Sprocket

Fig. 1 is a side view of a rear derailleur according to a first embodiment of the present invention.

Figure 2 is a rear view of the chain guide of the rear derailleur.

Figure 3 is a side view of the chain guide.

Figure 4 is a schematic cross-sectional view of the pulley mounting portion of the chain guide.

Fig. 5 is a schematic cross-sectional view corresponding to Fig. 4 in a modification of the first embodiment.

Fig. 6 is a schematic cross-sectional view corresponding to Fig. 4 of the second embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view corresponding to Fig. 4 in a modification of the second embodiment.

In the first embodiment, the bicycle shifting machine according to the first embodiment, that is, the rear derailleur 2, is moved by the chain 4 to a plurality of (for example, ten) sprocket wheels R1-R10 having different numbers of teeth. Once the shifting action is performed. The sprocket wheels R1-R10 are arranged on the axis of the rear hub fixed shaft 9 to. The shifting operation of the rear derailleur 2 is mechanically or electrically operated by a shifting operation portion (not shown) provided at a front portion (for example, a handlebar) of the frame 8 of the bicycle. In this embodiment, the operation is mechanically performed by the shift operating portion connected via the operation cable 6. The operation cable 6 has an inner cable 6a and an outer casing 6b that can be inserted into the inner cable 6a. The operating cable 6 is a conventional Bowden type cable. “Before”, “After”, “Left”, “Right”, “Upper” and “Bottom”, and the same meaning, means that the occupant is riding on the handlebar and riding on the saddle (not shown). The status of "before", "after", "left", "right", "up" and "down".

The rear derailleur 2 includes a base member 10 attachable to the rear portion 8a of the frame 8 of the bicycle, a pulley assembly 12 of the first embodiment of the present invention, a moving member 14, and a coupling mechanism 16. The pulley assembly 12 is movable relative to the base member 10. The moving member 14 rotatably supports the pulley assembly 12. The coupling mechanism 16 connects the moving member 14 to the base member 10 such that the moving member 14 can move relative to the base member 10.

<Base member>

The base member 10 has a hub portion 10a detachably attached to the rear portion 8a of the frame 8 and detachably extending from the hub portion 10a in the radial direction. The hub portion 10a has a spring member (not shown) that is biased toward the rear portion 8a in the clockwise direction of the first figure. The arm portion 10b has a first connection support portion 10c to which the connection mechanism 16 is rotatably attached at the distal end portion. The base member 10 is provided with an outer support portion 10d for supporting the outer casing 6b of the operation cable 6.

<pulley assembly>

The pulley assembly 12, in this embodiment, functions as a chain guide for the rear derailleur 2 for guiding the chain 4 from any of the sprockets R1-R10 to the other sprockets R1-R10. The moving member 14 rotatably supports the pulley assembly 12. As shown in FIGS. 2, 3, and 4, the pulley unit includes a first support member 20, a second support member 22, two pulleys 26 each including a support shaft 24, and a first support member 20; A plurality (for example, four) of connecting members 28 connected to the second support member 22. In a state where the rear derailleur 2 is attached to the frame 8, the second support member 22 is disposed to face the first support member 20 at a position closer to the frame 8 than the first support member 22.

<1st support member>

The first support member 20 is, for example, a metal plate-shaped member including at least aluminum and stainless steel. The first support member 20 has at least one first support portion 20a and a rotation portion 20b rotatably supported by the movement member 14. In this embodiment, two first support portions 20a are provided. The rotating portion 20b is constituted by a rotating shaft 20f that is rotatably supported by the moving member 14. In this embodiment, the first support member 20 extends from the rotating portion 20b, and the first support portion 20a is provided at one end near the rotating portion 20b and at the other end extending from the rotating portion 20b. As shown in FIGS. 3 and 4, the first support member 20 has two first mounting portions 20c for mounting the first support portion 20a, and four connecting members 28 for mounting. The four first connecting holes 20d. In this embodiment, the first attachment portion 20c has a screw hole 20e.

The first support portion 20a rotatably supports one end of the support shaft 24. The first support portion 20a includes a first support portion main body 21a and a first rolling bearing 21b that is housed in the first support portion main body 21a and that rotatably supports one end of the support shaft 24. The first rolling bearing 21b is a ball bearing in this embodiment. The rolling bearing is not limited to the ball bearing, and may be another type of rolling bearing such as a needle roller bearing. The first support portion main body 21a is a substantially circular member and includes a first flange portion 21c, a first male screw portion 21d having a smaller diameter than the first flange portion 21c, and a first one formed on the inner peripheral portion. The recess 21e is accommodated. A first tool locking portion 21f that can lock a screw turning tool such as a hexagonal wrench is formed on the outer surface of the first flange portion 21c. The first male screw portion 21d is engaged with the female screw portion 20e formed in the first mounting portion 20c. The first connecting hole 20d is provided to allow the connecting member 28 to pass therethrough. The first connection hole 20d is provided, for example, two around the first attachment portion 20c. In the first housing recess 21e, the first rolling bearing 21b is housed in a state in which the movement in the direction away from the pulley 26 is restricted.

<2nd support member>

The second support member 22 is, for example, a metal plate-shaped member including at least aluminum and stainless steel. The second support member 22 has two second support portions 22a that are disposed to face the two first support portions 20a. In this embodiment, the second support member 22 extends to connect the two second support portions 22a. The second support member 22 is as shown in FIGS. 3 and 4 There are two second attachment portions 22c for attaching the second support portion 22a, and four second connection holes 22d for engaging the four coupling members 28. In this embodiment, the second attachment portion 22c has a screw hole 22e. The second connecting hole 22d is a screw hole.

The second support portion 22a rotatably supports the other end of the support shaft 24. The second support portion 22a and the first support portion 20a have substantially the same shape. Each of the second support portions 22a includes a second support portion main body 23a and a second rolling bearing 23b that is housed in the second support portion main body 23a and rotatably supports the other end of the support shaft 24. The second rolling bearing 23b is a rolling bearing of the same type as the first rolling bearing 22b. The second support portion main body 23a is a circular member and includes a second flange portion 23c, a second male screw portion 23d having a smaller diameter than the second flange portion 23c, and a second housing formed in the inner peripheral portion. Concave portion 23e. The second flange portion 23c is formed with a second tool locking portion 23f that can lock a screw turning tool such as a hexagonal wrench. The second male screw portion 23d is engaged with the female screw portion 22e formed in the second mounting portion 22c. The second coupling hole 22d is provided to be screwed to the coupling member 28. The second connection hole 22d is provided, for example, two around the second attachment portion 22c. In the second housing recess 23e, the second rolling bearing 23b is housed in a state in which the movement in the direction away from the pulley 26 is restricted.

<pulley>

Each of the two pulleys 26 includes a support shaft 24 and a pulley main body 26a that is coupled to the support shaft 24 so as to be rotatable. The support shaft 24 is, for example, a member made of metal including at least aluminum and stainless steel. Support shaft 24 There are a large-diameter pulley fixing portion 24a and a supported portion 24b formed to have a small diameter at both ends of the pulley fixing portion 24a. The pulley main body 26a is rotatably coupled to the large-diameter pulley fixing portion 24a by a coupling structure such as adhesion, press fitting, or engagement of serrations. The end faces of the first rolling bearing 21b and the second rolling bearing 23b close to the pulley 26 are in contact with both ends of the pulley fixing portion 24a. The first rolling bearing 21b and the second rolling bearing 23b are attached to the supported portions 24b at both ends. When the first support portion 20a and the second support portion 22a are screwed into the first support member 20 and the second support member 22, respectively, the axes of the first rolling bearing 21b, the second rolling bearing 23b, and the support shaft 24 are restricted. The movement of the direction. The pulley main body 26a is a member made of metal such as aluminum. The pulley main body 26a has a plurality of protrusions 26b which are formed at intervals in the circumferential direction and are engageable with the chain 4. Among the pulleys 26, a pulley 26 disposed on the upper side of Fig. 3 functions as a guide pulley for guiding the chain 4 to any one of the sprockets R1 to R10. The pulley 26 disposed on the lower side of Fig. 3 functions as a tension pulley for applying tension to the chain 4.

<connection member>

The plurality of connecting members 28 are bolt members that penetrate the first connecting hole 20d of the first supporting member 20 and are screwed into the second connecting hole 22d. Two connecting members 28 are disposed to sandwich the respective pulleys 26. A sleeve 30 for defining the interval between the first support member 20 and the second support member 22 is attached to the outer peripheral side of the coupling member 28.

In the pulley assembly 12 of this configuration, included in the pulley 26 The support shaft 24 is rotatably supported by the both ends of the first support portion 20a and the second support portion 22a. Therefore, the pulley main body 26a is not inclined with respect to the support shaft 24, and the support shaft 24 is inclined with respect to the first support portion 20a and the second support portion 22a. Therefore, the interval between the support of the pulley 26 becomes long, the pulley 26 is less inclined, and the sway of the pulley 26 can be reduced.

<moving member>

The moving member 14 is coupled to the base member 10 by a coupling mechanism 16 as shown in FIGS. 1 and 2 . The moving member 14 has a second connecting support portion 14a shown in Fig. 1 for rotatably connecting the connecting mechanism 16, and a second figure that rotatably connects the pulley unit 12 and springs it clockwise. The third connection support portion 14b is shown.

<linkage mechanism>

As shown in FIG. 1, the connection mechanism 16 has a first link member 32 and a second link member 34, and the first link member 32 and the second link member 34 are rotatably coupled to each other at both ends. 1 connects the support portion 10c and the second connection support portion 14a. The second link member 34 is disposed to face the first link member 32. The coupling mechanism 16 has a biasing member (not shown) that biases the pulley assembly 12 in a direction away from the frame 8 (or in a direction approaching the frame 8). The connection mechanism 16 constitutes a four-bar linkage mechanism by the base member 10, the first link member 32, the second link member 34, and the moving member 14. The first link member 32 is provided with an inner mounting portion 32a to which an inner cable extending from the outer casing 6b supported by the outer support portion 10d is attached 6a. By moving the inner cable 6a forward and backward with respect to the outer casing 6b by the shift operating portion, the first link member 32 and the second link member 34 are rotated, and the pulley assembly 12 of the rear derailleur 2 is brought closer to the frame 8. Move away from the direction.

<Modification of First Embodiment>

In the first embodiment, the support shaft 24 included in the pulley 26 has a large-diameter pulley fixing portion 24a and a small-diameter supported portion 24b. In the pulley assembly 112 according to the modification of the first embodiment shown in FIG. 5, the pulley 126 has the pulley main body 126a and the support shaft 124. The support shaft 124 is a shaft portion having substantially the same diameter as the supported portion 24b of the first embodiment. Then, the hole portion formed in the pulley main body 126a is smaller than the hole portion of the pulley main body 26a of the first embodiment. The pulley main body 126a is integrally coupled to the central portion of the support shaft 124 in the axial direction by a coupling structure such as adhesion, press fitting, or engagement of serrations. The support shaft 124 is provided with two stopper wheels 136 for restricting the movement of the support shaft 124 and the first rolling bearing 21b and the second rolling bearing 23b in the axial direction. The stopper wheel 136 is, for example, an E-shaped stopper wheel or a C-type stopper wheel, and is attached to the support shaft 124 in contact with the end faces of the proximity pulley 26 of the first rolling bearing 21b and the second rolling bearing 23b, respectively. The stopper wheel 136 is attached to the annular groove 124c formed at a position close to the end surface of the first rolling bearing 21b and the second rolling bearing 23b of the support shaft 124 on the side close to the pulley 26. In the pulley assembly 112 of the modification of this configuration, the weight of the support shaft 124 can be reduced.

Other configurations of the pulley assembly 112 of the modified example and the first real Since the embodiment has the same configuration, the description thereof will be omitted, and the same reference numerals as in the first embodiment will be used in the fifth embodiment. However, even if the structure is the same, the materials are different. The first support member 20 and the second support member 22 include a first support portion 20a and a second support portion 22a, and are members made of a synthetic resin containing, for example, at least a polyimide resin and a polyacetal resin. Similarly to the first support member 20 and the second support member 22, the pulley 26 is made of synthetic resin. In the following description, similar to the above-described modifications, the detailed description of the structure similar to that of the first embodiment will be omitted, and the same reference numerals as in the first embodiment will be used.

<Second Embodiment>

In the pulley unit 212 of the second embodiment shown in Fig. 6, the first support portion 220a of the first support member 220 further includes the first seal member 221g, and the second support portion 222a of the second support member 222 further has the second member Sealing member 223g. The first sealing member 221g and the second sealing member 223g are examples of the sealing member that seals the first rolling bearing 21b and the second rolling bearing 23b. The first sealing member 221g and the second sealing member 223g are provided to prevent foreign matter such as liquid from entering the first rolling bearing 21b and the second rolling bearing 23b from the pulley 26 side. The first seal member 221g is attached to the annular first seal attachment groove 221h, and the first seal attachment groove 221h is formed in the proximity of the pulley 26 of the first housing recess 21e of the first support portion main body 21a of the first support portion 220a. Weekly. The second seal member 223g is attached to the annular second seal attachment groove 223h, and the second seal attachment groove 223h is formed in the second support portion of the second support portion 222a. The second housing recess 23e of the body 23a approaches the inner circumferential surface of the pulley 26. The first sealing member 221g and the second sealing member 223g are annular sealing members, and have a first protruding portion 221i and a second protruding portion 223i having a narrow tip end on the inner peripheral side. The first protrusion 221i and the second protrusion 223i are in contact with the large-diameter pulley fixing portion 24a of the support shaft 24. By bringing the first protrusion 221i and the second protrusion 223i, which are thin at the tip end, into contact with the support shaft 24, it is possible to suppress an increase in the rotational resistance of the support shaft 24. Thereby, the reduction in the rotation performance of the first rolling bearing 21b and the second rolling bearing 23b can be suppressed, and the first rolling bearing 21b and the second rolling bearing 23b can be sealed.

Since the other structure of the pulley assembly 212 has the same structure as that of the first embodiment, detailed description thereof will be omitted, and the same reference numerals as in the first embodiment are used in Fig. 6.

<Modification of Second Embodiment>

In the pulley unit 312 according to the modification of the second embodiment, the first support portion 320a of the first support member 320 made of metal further includes the third seal member 321j, and the second support member 322 is second. The support portion 322a further has a fourth sealing member 323j. The third sealing member 321j and the fourth sealing member 323j are provided to prevent foreign matter from entering the first rolling bearing 21b and the second rolling bearing 23b from the first support portion 320a and the second support portion 322a. In the modification, the third sealing member 321j and the fourth sealing member 323j are O-rings. The third sealing member 321j is attached to the first seal groove 321k, and the first seal groove 321k is formed in a ring shape on a surface that is in contact with the first support member 320 of the first support portion 320a. Fourth sealing member 323j is attached to the second seal groove 323k, and the second seal groove 323k is formed in a ring shape on a surface that is in contact with the second support member 322 of the third support portion 322a.

The other structure of the pulley unit 312 has the same structure as that of the first embodiment and the second embodiment, and therefore detailed description thereof will be omitted. In the seventh embodiment, the same reference numerals as in the first embodiment and the second embodiment are used. However, the material is different from the structure of the second embodiment. The first support portion 320a and the second support member 322 including the second support portion 322a are members made of synthetic resin including, for example, at least a polyimide resin and a polyacetal resin. Similarly to the second support member 322, the pulley 26 is made of synthetic resin.

<Other Embodiments>

The above description of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the invention. In particular, the plural embodiments and modifications described in the present specification can be arbitrarily combined as needed.

(a) In the above two embodiments, although the chain guide of the rear derailleur is exemplified as the function of the pulley assembly, the present invention is not limited thereto. For example, the present invention is also applicable to a pulley assembly that applies tension to a chain and a pulley assembly that prevents the chain from falling off.

(b) In the above two embodiments, the number of pulleys of the pulley assembly is two, and the present invention is not limited thereto. The number of pulleys can be one or three. In this case, the first support portion and the second support portion are provided as The same number as the pulley is also available.

(c) In the above two embodiments, the bolt member is used as the connecting member, and the bolt member is screwed and fixed to the second supporting member, but the present invention is not limited thereto. A coupling member penetrating the second support member may be provided, and the bolt may be screwed into the nut. A rivet can also be used as the joining member. Further, the first support member and the second support member may be integrally formed. For example, if it is made of metal, the first support member and the second support member and the connecting member may be integrally formed by bending. For example, if it is made of synthetic resin, the first support member and the second support member and the connecting member may be integrally formed. In this case, the pulley and the support shaft may be detachably coupled by a non-circular engagement or key combination.

(d) In the above two embodiments, the bearing is a rolling bearing, and may be a sliding bearing having a high sliding performance. For example, a bushing made of metal or synthetic resin can also be used. A bushing having a plating layer containing a fluorine compound having high sliding properties can also be used. Further, at least the center portion of the first support portion and the second support portion may be formed of a material having high sliding performance, and the support shaft may be directly supported by the accommodation recessed portions of the first support portion and the second support portion.

(e) In the above embodiment, the rear derailleur 2 operated by the operation of the cable is exemplified, but the present invention is not limited thereto. The present invention is also applicable to a rear derailleur that is operated by an actuator such as a pneumatic actuator or an electric actuator.

(f) In the above embodiment, although the example rear derailleur 2 is mounted on the rear axle mounting shaft with the rear of the frame of the bicycle The position of 9 is different, and the present invention is not limited thereto. The present invention is also applicable to a rear derailleur that is mounted at the same position as the position at which the hub fixing shaft 9 is mounted after the bicycle is mounted.

(g) In the above embodiment, the rotation shaft 20f and the support shaft 24 are separately provided, and the rotation shaft and the support shaft may be integrally provided, and the pulley assembly may be rotated about the support shaft with respect to the moving member. In this case, the support shaft may be extended from the first support portion close to the moving member side toward the moving member.

12‧‧‧ Pulley assembly

20‧‧‧1st support member

20a‧‧‧1st support

20c‧‧‧1st installation department

20d‧‧‧1st link

20e‧‧‧ screw holes

21a‧‧‧1st support body

21b‧‧‧1st rolling bearing

21c‧‧‧1st flange

21d‧‧‧1st male thread

21e‧‧‧1st containment recess

21f‧‧‧1st tool lock

22‧‧‧2nd support member

22a‧‧‧2nd support

22c‧‧‧2nd Installation Department

22d‧‧‧2nd link

22e‧‧‧ screw holes

23a‧‧‧2nd support body

23b‧‧‧2nd rolling bearing

23c‧‧‧2nd flange

23d‧‧‧2nd male thread

23e‧‧‧2nd containment recess

23f‧‧‧2nd tool carding

24‧‧‧Support shaft

24a‧‧‧Bear fixing

24b‧‧‧Supported Department

26‧‧‧ pulley

26a‧‧‧ Pulley body

26b‧‧‧Protruding

28‧‧‧Connected components

30‧‧‧ sleeve

Claims (9)

A pulley assembly that can be attached to a bicycle; the pulley assembly includes: a first support member, a second support member, and a pulley; the first support member includes a first support portion; and the second support member includes the first support a second support portion that is disposed to face each other; the pulley includes a support shaft that is rotatably supported by the first support portion and the second support portion at both ends. The pulley unit according to claim 1, wherein the first support member and the second support member are made of aluminum. The pulley unit according to claim 1, wherein the first support member and the second support member are made of synthetic resin. The pulley unit according to claim 1, wherein at least one of the first support member and the second support member is made of aluminum, and the other is made of synthetic resin. The pulley assembly of claim 1, wherein the support shaft is made of iron. The pulley unit according to claim 1, wherein the first support portion and the second support portion include a rolling bearing that rotatably supports the support shaft. The pulley unit according to claim 6, wherein the first support portion and the second support portion have a sealing member that seals the rolling bearing. A bicycle shifting device that can be mounted on a bicycle; the bicycle shifting device includes: a base member, a pulley assembly, a moving member, and a coupling mechanism; the base member can be mounted on the bicycle; the pulley assembly is patented The pulley assembly of any one of items 1 to 7 wherein the pulley assembly is movable relative to the base member; the moving member rotatably supports the pulley assembly; the coupling mechanism to allow the moving member to be relative to the base member The moving means connects the moving member to the base member. The bicycle shifting device according to claim 8, wherein the pulley assembly selectively guides the chain to a plurality of sprocket wheels having different numbers of teeth arranged in a direction of a fixed axis of the wheel.