JP2012046052A - Rim for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve binding force between a first ring part and a second ring part in a rim for a bicycle.SOLUTION: The rim 26 for the bicycle includes: the first ring part 30; the second ring part 32; and a binding member 34. The second ring part 32 is disposed on an inner periphery of the first ring part 30 and bonded to the first ring part 30. The binding member 34 binds the first ring part 30 and the second ring part 32 together.

Description

  The present invention relates to a bicycle rim constituting a wheel of a bicycle.

  Bicycles generally include a frame that forms a skeleton of a vehicle body, and front and rear wheels are attached to front and rear ends of the frame. The front wheel and the rear wheel are provided with rims on which tires are mounted. The rim has an annular shape and is connected to the wheel hub by, for example, spokes.

  In such a rim, a composite rim in which different materials are combined is known in order to maintain the strength of the wheel to reduce weight and reduce air resistance (see, for example, Patent Document 1). A conventional composite rim has a first annular portion made of metal such as aluminum and a second annular portion made of carbon fiber reinforced resin. A tire is attached to the outer peripheral portion of the first annular portion, and a spoke is attached to the inner peripheral portion of the first annular portion. The first annular portion and the second annular portion are bonded with an adhesive.

German Patent Application Publication No. 102007041091

  In the conventional rim, the first annular portion and the second annular portion are bonded with an adhesive, but the rim in which the binding force between the first annular portion and the second annular portion is further improved. Is desired.

  The subject of this invention is improving the restraint force of a 1st ring part and a 2nd ring part in a bicycle rim.

  A bicycle rim according to a first aspect includes a first annular portion, a second annular portion, and a restraining member. The second annular portion is bonded to the inner peripheral portion of the first annular portion. The restraining member restrains the first annular portion and the second annular portion.

  In this bicycle rim, the first annular portion and the second annular portion bonded to the inner peripheral portion of the first annular portion are restrained by the restraining member. Thereby, the restraint force of a 1st ring part and a 2nd ring part improves more.

  A bicycle rim according to a second aspect is the bicycle rim according to the first aspect, wherein the restraining member is a thread-like member. In this case, since the constraining member is a thread-like member, the first annular part and the second circular part are connected by turning the thread-like member around the first annular part and the second annular part and connecting both ends of the thread-like member. The ring portion can be easily restrained.

  A bicycle rim according to a third aspect is the bicycle rim according to the second aspect, wherein the thread-like member is selected from a wire and a resin yarn. In this case, since a relatively strong wire and resin yarn are used, the restrained state can be maintained for a long time.

  A bicycle rim according to a fourth aspect is the bicycle rim according to the first or second aspect, wherein a plurality of holes are provided in the first annular portion and the second annular portion, respectively. The restraining member is inserted through the plurality of holes. In this case, the first annular portion and the second annular portion can be reliably restrained by inserting the restraining member into the plurality of holes.

  A bicycle rim according to a fifth aspect is the bicycle rim according to the fourth aspect, wherein the plurality of holes are formed in a portion where the first annular portion and the second annular portion overlap. Accordingly, when the restraining member is inserted into the plurality of holes, the first annular portion and the second annular portion can be inserted and restrained at a time.

  A bicycle rim according to a sixth aspect is the bicycle rim according to the first or second aspect, wherein the first annular portion has a box shape in cross section. In this case, since the first annular portion on the outer peripheral side has a box shape, the strength of the rim can be maintained at the first annular portion.

  A bicycle rim according to a seventh aspect is the bicycle rim according to the second or third aspect, wherein the first annular portion connects the pair of side walls having a brake contact surface and the side walls, and is spaced in the radial direction. And an outer annular portion and an inner annular portion provided to be separated from each other. The restraining member is inserted through the space surrounded by the side wall portion, the outer annular portion, and the inner annular portion. As a result, the restraining member is not exposed to the outside of the rim.

  A bicycle rim according to an eighth aspect is the bicycle rim according to the first or second aspect, wherein the first annular portion is made of metal and the second annular portion is made of a synthetic resin. In this case, the strength is maintained by the metal first annular portion, and the second annular portion made of synthetic resin is connected to the hub via a connecting member such as a spoke in order to reduce weight and reduce air resistance. Can be linked.

  A bicycle rim according to a ninth aspect of the invention is a bicycle rim according to the eighth aspect, wherein the bicycle rim includes any one of a carbon fiber reinforced resin, a glass fiber reinforced resin, and an aramid fiber reinforced resin. In this case, since the fiber reinforced resin having high strength is used even with the light synthetic resin, the strength of the second annular portion can be kept high.

The side view of the bicycle by which one Embodiment of this invention was employ | adopted. Front sectional view of the rim. The III-III sectional view taken on the line of the rim | limb of FIG. The schematic diagram which shows the restraint state of the restraint member of this embodiment. The schematic diagram which shows the restraint state of the restraint member of other embodiment. Furthermore, the schematic diagram which shows the restraint state of the restraint member of other embodiment.

<First Embodiment>
In FIG. 1, a bicycle 101 employing the first embodiment of the present invention is a road bike. The bicycle 101 includes a diamond-shaped frame 102 having a front fork 98, a handle 104, a drive unit 105, a front wheel 106 and a rear wheel 107, a front brake device 108, and a rear brake device 109. The handle 104 is fixed to the front fork 98. The drive unit 105 includes a chain CN, a pedal PD, front and rear derailleur FD and RD, front and rear sprockets FP and RP, and the like. The front wheel 106 is attached to the front end of the front fork 98, and the rear wheel 107 is attached to the rear portion of the frame 102. The front brake device 108 is attached to the front surface of the front fork 98, and the rear brake device 109 is attached to the upper rear portion of the frame.

  The front wheel 106 is attached to the rim 26, the front hub 20f, the spoke 22 with one end locked to the front hub 20f, the rim 26 with the other end of the spoke 22 locked by the nipple 24 (see FIG. 2). Tire 28. The front hub 20f is attached to the tip of the front fork 98.

  The rear wheel 107 is mounted on the rim 26, the rear hub 20r, the spoke 22 having one end locked to the rear hub 20r, the rim 26 having the other end of the spoke 22 locked by the nipple 24 (see FIG. 2). Tire 28. The rear hub 20r is attached to the rear end portion of the frame 102.

<Rim>
The rim 26 is a composite rim in which different materials are combined. As shown in FIGS. 2 and 3, the rim 26 includes a first annular portion 30 on which the tire 28 can be attached to the outer peripheral portion, a second annular portion 32 that can lock the spokes 22, and a first annular ring. And a restraining member 34 for restraining the portion 30 and the second annular portion 32.

<1st ring part>
The first annular portion 30 is a metal member. The first annular portion 30 is formed of, for example, an aluminum alloy, a magnesium alloy, a titanium alloy, or the like. As shown in FIG. 2, the first annular portion 30 is a member having an outer peripheral portion that is open and an inner peripheral portion that is a box shape. In this embodiment, as the tire 28, a tire with an inner tube or a tubeless tire can be mounted.

  The first annular portion 30 includes a pair of left and right side wall portions 30a, an inner annular portion 30b and an outer annular portion 30c that are radially spaced apart from each other in a radial direction connecting the pair of side wall portions 30a. have. The inner annular portion 30b and the outer annular portion 30c are provided at an interval in the radial direction. The side wall portion 30a, the inner annular portion 30b, and the outer annular portion 30c are integrally formed. A bead locking portion 30d for locking the bead portion 28a formed on the inner peripheral side of the tire 28 is formed on the inner side surface of the pair of side wall portions 30a so as to protrude inward. The outer side surfaces of the pair of side wall portions 30a serve as brake contact surfaces 30k with which the brake shoes of the front brake device 108 (or the rear brake device 109) come into contact.

  The inner annular portion 30b and the outer annular portion 30c are connected by an annular wall portion 30e at an intermediate portion in the width direction (left-right direction in FIG. 3). Therefore, a first space 30f and a second space 30g divided in the width direction are formed between the inner annular portion 30b and the outer annular portion 30c. On the inner peripheral surface of the inner annular portion 30b, an engagement surface 30h configured with a curved surface so as to engage with the outer peripheral surface 32a of the second annular portion 32 is formed. The engagement surface 30 h is formed so as to go around from the both sides of the outer peripheral surface 32 a of the second annular portion 32 to the outer peripheral portion of the side surface. As a result, the second annular portion 32 is unlikely to come off from the first annular portion 30. Therefore, the outermost diameter of the second annular portion 32 is larger than the innermost diameter of the first annular portion 30.

  The first annular portion 30 is created by bending a material created by extrusion molding into a circle. When the second annular portion 32 is attached to the first annular portion 30, the second annular portion 32 is attached to the inner peripheral surface of the first annular portion 30 in a state where a portion of the annular shape is not connected. The both ends of the first annular portion 30 that are not connected are joined by appropriate joining means such as welding, adhesion, or a metal sleeve.

  A first nipple passage hole 30i (an example of a plurality of holes) and a second nipple passage hole 30j through which the nipple 24 screwed into the spoke 22 can pass and the second nipple passage hole 30j are spaced apart in the circumferential direction in the inner annular portion 30b and the outer annular portion 30c. The number of spokes 22 (for example, 16) is formed separately from each other.

<Second ring part>
The second annular portion 32 is made of resin. For example, the second annular portion 32 is made of a fiber reinforced resin including any one of a carbon fiber reinforced resin, a glass fiber reinforced resin, and an aramid fiber reinforced resin. In this embodiment, it is made of carbon fiber reinforced resin. The second annular portion 32 is bonded to the first annular portion 30 with, for example, an adhesive.

  The second annular portion 32 has a cross-sectional shape that tapers toward the inner peripheral side in the radial direction. The second annular portion 32 has a substantially triangular space or an inverted isosceles triangular space inside. A plurality of third nipple passage holes 32b (an example of a plurality of holes) that are continuous with the second nipple passage hole 30j and have substantially the same inner diameter as the second nipple passage hole 30j are provided on the outer peripheral side of the second annular portion 32. Is formed. Here, the 1st nipple passage hole 30i and the 3rd nipple passage hole 32b which are examples of a some hole are each provided in the position where the 1st annular part 30 and the 2nd annular part 32 overlap.

  On the inner peripheral side of the second annular portion 32, nipple mounting holes 32c for mounting the nipples 24 are formed at intervals in the circumferential direction by the number of the spokes 22. The nipple mounting hole 32c has an inner diameter through which the head of the nipple 24 cannot pass.

<Restraining member>
The restraining member 34 is a thread-like member in the present embodiment. As the thread-like member, for example, a member having a relatively high breaking strength such as high-strength polyethylene, Kevlar and Zylon is preferably selected. The restraining member 34 is inserted into the first nipple passage hole 30i and the third nipple passage hole 32b using a jig (not shown). Then, the first annular portion 30 and the second annular portion 32 are constrained by connecting both ends through the first annular portion 30 and the second annular portion 32. The restraining member 34 includes, for example, the first annular portion 30 and the second circle at four positions at intervals of 90 degrees, for example, among the plurality of (for example, 16) first nipple passage holes 30i and the third nipple passage holes 32b. The ring portion 32 is restrained. Here, the thread-like restraining member 34 restrains the first annular portion 30 and the second annular portion 32 in a tensioned state so as not to loosen.

<Installation procedure of restraint member>
A specific mounting procedure of the restraining member 34 is as follows. First, as shown in FIGS. 2 and 3, the restraining member 34 is inserted from the second nipple passage hole 30j, and is further inserted through the first nipple passage hole 31i and the third nipple passage hole 32b. And the front-end | tip part of the restraint member 34 is moved toward the 3rd nipple passage hole 32b of the 2nd annular part 32 using the jig | tool which is not shown in figure. When the tip of the restraining member 34 reaches the next third nipple passage hole 32b, the tip of the restraining member 34 is taken out from the third nipple passage hole 32b. Then, the restraining member 34 is moved toward the original first nipple passage hole 30i in one of the first space 30f and the second space 30g. When the distal end of the restraining member 34 reaches the first nipple passage hole 30i, the restraining member 34 is inserted into the third nipple passage hole 32b by a jig, and the inner periphery of the second annular portion 32 is again inserted into the next third nipple. It moves toward the passage hole 32b. Then, the tip of the restraining member 34 is taken out from the next third nipple passage hole 32b, and the restraining member 34 is directed toward the first first nipple passage hole 30i in the other one of the first space 30f and the second space 30g. Move. Thereby, as shown in FIG. 3, the restraining member 34 is disposed through the inner peripheral portion of the second annular portion 32 and the first space 30 f and the second space 30 g of the first annular portion 30. When the restraining member 34 reaches the first first nipple passage hole 30i, the distal end thereof is pulled out and combined with the proximal end portion. Thereby, the restraining member 34 restrains the first annular portion 30 and the second annular portion 32. This procedure is repeated three more times, for example, and the first annular portion 30 and the second annular portion are constrained at four locations in the circumferential direction. This state is shown in FIG. In FIG. 4, as described above, the four constraining members 34 constrain the first annular portion 30 and the second annular portion 32 at four locations spaced in the circumferential direction.

  By restraining the first annular portion 30 and the second annular portion 32 of the rim 26 with the restraining member, the restraining force between the first annular portion 30 and the second annular portion 32 is further improved.

<Other embodiments>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention. In particular, a plurality of embodiments and modifications described in the present specification can be arbitrarily combined as necessary.

  (A) In the above embodiment, the plurality of holes through which the restraining member 34 is inserted are configured by the first nipple passage hole 30i and the third nipple passage hole 32b. May be provided. In particular, when the hub and the rim are connected by a connecting member other than the spoke or a disk member, a dedicated hole through which the restraining member is inserted may be provided.

  (B) In the said embodiment, although carbon fiber reinforced resin was used as a 2nd ring part, you may use another fiber reinforced resin.

  (C) In the above embodiment, a road bike rim is exemplified, but the present invention can be applied to all bicycle rims such as mountain bikes and light vehicles.

  (D) In the above embodiment, the constraining member 34 is doubled through the first space 30f and the second space 30g, but may be passed only once through any of the spaces.

  (E) In the above embodiment, a thread is used as the restraining member. However, the thread-like member is not limited to the thread, and may be a wire. Further, the restraining member is not limited to the thread-like member, and for example, an elastic member that elastically restrains the first annular portion 30 and the second annular portion 32 may be used. Also, fastening members such as screws and rivets may be used.

  (F) In the embodiment described above, the four restraining members 34 restrain the first annular portion 30 and the second annular portion 32 at four locations spaced in the circumferential direction. Any number is fine. For example, you may restrain at eight places spaced apart in the circumferential direction.

  For example, in FIG. 5, for example, 16 restraining members 134 restrain the first annular portion 30 and the second annular portion 32 using all the first nipple passage holes 30 i, that is, all of the plurality of holes. is doing.

  Further, in FIG. 6, one restraining member 234 is inserted through all the first nipple passage holes 30 i so as to sew the first annular portion 30 and the second annular portion 32. Thereby, the restraining member 134 restrains the first annular portion 30 and the second annular portion 32. In this embodiment, all the holes are sewn, but holes that are spaced apart may be sewn. In FIG. 6, one side of the restraining member 134 to be sewn is drawn with a solid line, and the other side is drawn with a broken line.

  Even in such an embodiment, the same operational effects as in the above-described embodiment can be obtained.

  (G) In the embodiment, the first annular portion is a box-shaped member at the inner periphery, but may not have a box shape. In this case, the first annular portion has a shape that does not include the outer annular portion 30c and the annular wall portion 30e, but the first annular portion and the second annular portion are separated by the restraining member as in the above embodiment. Can be restrained.

(F) In the above embodiment, the clincher rim in which the first annular portion has the bead locking portion 30d has been described as an example, but the present invention may be applied to a tubular rim.
(G) In the embodiment described above, the thread-like restraining member 34 restrains the first annular portion 30 and the second annular portion 32 in a tensioned state so as not to be loosened, but the first annular shape is somewhat loosened. The annular portion 30 and the second annular portion 32 may be constrained.

20f front hub 20r rear hub 22 spoke 24 nipple 26 rim 28 tire 30 first annular portion 30a side wall portion 30b inner annular portion 30c outer annular portion 30d bead locking portion 30e annular wall portion 30f first space 30g second space 30h engagement Surface 30i First nipple passage hole 30j Second nipple passage hole 30k Contact surface 32 Second annular portion 32a Outer peripheral surface 32b Third nipple passage hole 32c Nipple mounting hole 34 Restriction member 98 Front fork 101 Bicycle 102 Frame 104 Handle 105 Drive part 106 Front wheel 107 Rear wheel 108 Front brake device 109 Rear brake device

Claims (9)

A first ring portion;
A second annular portion bonded to the inner periphery of the first annular portion;
A restraining member that restrains the first annular portion and the second annular portion;
Bicycle rim equipped with.   The bicycle rim according to claim 1, wherein the restraining member is a thread-like member.   The bicycle rim according to claim 2, wherein the thread-like member is selected from a wire and a resin thread. A plurality of holes are provided in each of the first annular portion and the second annular portion,
The bicycle rim according to claim 1, wherein the restraining member is inserted through the plurality of holes.   The bicycle rim according to claim 4, wherein the plurality of holes are formed in a portion where the first annular portion and the second annular portion overlap each other.   The bicycle rim according to claim 1 or 2, wherein the first annular portion has a box shape in cross section. The first annular portion includes a pair of side wall portions having a brake contact surface, and an outer annular portion and an inner annular portion that connect the sidewall portions and are provided at intervals in the radial direction.
The bicycle rim according to claim 2 or 3, wherein the restraining member is inserted through a space surrounded by the side wall portion, the outer annular portion, and the inner annular portion.   The bicycle rim according to claim 1 or 2, wherein the first annular portion is made of metal, and the second annular portion is made of a synthetic resin.   The bicycle rim according to claim 8, wherein the second annular portion is made of a fiber reinforced resin including any one of a carbon fiber reinforced resin, a glass fiber reinforced resin, and an aramid fiber reinforced resin.

Images