JP4916591B1 - Protection device, cylindrical protection member made of resin and cylindrical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a degree of slipping of a cylindrical protective member according to a user's request or the like without being easily broken by a mounting bolt etc. while having a relatively simple and low cost structure. Provide a protection device that can.
SOLUTION: The present invention includes a cylindrical protection member 140 made of resin and a cylindrical member 130 accommodated inside thereof, and is inserted through an opening provided in a substantially central portion thereof. In addition, the protection device 100 is configured to be attached to the attachment counterpart 2 by fastening members 110 and 150 capable of tightening the bottom portion 141 of the cylindrical protection member in the axial direction, and includes a small diameter portion 131 and a large diameter on the outer periphery of the cylindrical member 130. The bottom part 141 of the cylindrical protection member is accommodated between the step part 133 between the diameter part 132 and the attachment partner 2, and the end surface 134 of the small diameter part 131 is attached so as to face the attachment partner 2. It is attached to the other party 2.
[Selection] Figure 1

Description

  The present invention relates to a protection device for protecting a motorcycle such as a motorcycle from damage or the like during a fall. Moreover, it is related with the resin-made cylindrical protection members and cylindrical members utilized for the said protection apparatus.

  Protective device to prevent damage to relatively expensive parts and important functional parts, etc. in case of a fall in a bicycle, a bicycle with an electric assist, a bicycle with a motor, a motorcycle, etc. As an example, for example, as described in Patent Document 1, a front fork protector device has been proposed.

  However, such a front fork protector device has low versatility, is relatively expensive, has a large air resistance, or does not match in design depending on the vehicle.

  Further, in Non-Patent Document 1, a protection device is attached by projecting outward from the vicinity of both ends of the front axle 2 and rear axle 3 of the motorcycle 1 as shown in FIG. 6, and this axle protection device is caused to collide with the ground or the like. Thus, there is disclosed a device in which other parts are protected from damage or the like.

  Non-patent document 1 discloses a resin cylindrical protective member at both ends of a mounting shaft inserted through a hollow portion of a hollow front axle (or rear axle) as shown in FIG. This is inserted and fastened to both ends of the front axle (or rear axle) via threaded portions formed on the outer periphery of the mounting shaft.

  This type of cylindrical protective member is advantageous in that it is highly versatile and relatively inexpensive, and has little influence on air resistance and little design influence on the vehicle.

  However, in the case where the mounting shaft is inserted inside the hollow axle shaft as illustrated in FIG. 9 and the cylindrical protective members are attached to both ends thereof, the slack (tension) of the drive chain is adjusted when the wheel is attached or detached. In this case, since it is necessary to remove the cylindrical protective member each time, the workability may be deteriorated.

  In the case of such a configuration, on the rear axle side where the steering is not effective, it is assumed that a relatively large impact may be directly transmitted to the axle shaft at the time of a fall and suffer from deformation or other damage.

  Here, in a chain drive type motorcycle or the like, as shown in FIG. 7, an adjuster 10 for adjusting the slackness of the drive chain 7 is provided.

  The adjuster 10 includes an adjuster block 11 that is inserted into the end portion of the rear axle shaft 3 and fastened and fixed to the swing arm 4. The rear axle shaft 3 is inserted into the elongated hole 5 of the swing arm 4 inside the adjuster block 11.

  Further, on the vehicle front side of the adjuster block 11, a tip of an adjuster bolt 6 for adjusting the relative position of the rear axle 3 in the front-rear direction with respect to the swing arm 4 (adjustment of slack of the drive chain) extends from the swing arm 4. It is configured to face each other.

  The swing arm of the adjuster block 11 (and thus the rear axle 3 and the driven sprocket 8) that is in contact with the tip of the adjuster bolt 6 is adjusted by adjusting the rearward projecting amount of the adjuster bolt 6 from the swing arm 4. The relative position with respect to 4 is adjusted, so that the slack of the drive chain 7 can be adjusted.

  In addition, there has been proposed a cylindrical protection member (see FIG. 10) in the vicinity of the rear end of the adjuster block 11 so as to protrude in the vehicle width direction (see FIG. 10). When adjusting the slack (tension), it is possible to eliminate the need to remove and remove the cylindrical protective member each time, improve workability, and transmit the impact directly to the rear axle shaft 3 during a fall. This has the advantage that it can be suppressed and the degree of damage and the like can be reduced.

No. 07-54064

SUPERMOTO ENGINEERING Homepage November 30, 2011 Search Internet <URL http://www.supermotoengineering.com/home.php>

  However, the cylindrical protective member as disclosed in Non-Patent Document 1 is made of a resin such as polyoxymethylene (POM) or polyacetal (Derlin (registered trademark) or Duracon (registered trademark)). Since the center penetration part of the resin member is fastened and fixed with a mounting bolt, etc., the cylindrical bolt protects the mounting bolt by bending stress and breaks due to an impact during a fall. There has been a situation in which the original protective function such as protection of relatively expensive parts, important functional parts, and the like cannot be sufficiently achieved due to the members falling off.

  In addition, since polyoxymethylene (POM) or polyacetal (so-called delrin or duracon) has a small coefficient of friction, when the vehicle falls over on a circuit with few obstacles, the above-mentioned cylindrical protective member is in a state where the vehicle falls with little damage. Since it slides on the paved road surface while being supported by the brake and is stopped by applying a brake at a part such as soil or sand outside the course, the protective function by the above-described cylindrical protective member is satisfactorily achieved.

  However, when the overturning vehicle is slipping while being supported by the above-described cylindrical protective member on a circuit or the like, the above-mentioned cylindrical protective member is located on a raised portion such as a curb provided between the course and the course. In such a case, as described above, there is a possibility that the mounting bolt may be broken due to bending stress acting directly on the mounting bolt. There is a risk that it will be impossible to play. In addition, since there are many obstacles on public roads, the mounting bolt of the above-mentioned cylindrical protection member is broken due to collision with the obstacle, and the above-mentioned cylindrical protection member falls off, and the protection function is sufficient. The risk of not being able to play is further increased.

  On the other hand, polyoxymethylene (POM) or polyacetal (so-called Delrin or Duracon) has a small coefficient of friction, and there is also a problem that a falling vehicle slips too much when falling.

  Furthermore, on off-road bikes that run on road surfaces such as sand and earth, even with polyoxymethylene (POM) or polyacetal (so-called delrin or duracon), the slipping is poor, so the usage situation and user requirements, etc. Depending on the situation, it may be preferable to slide further.

  The present invention has been made in view of such circumstances, and has a relatively simple and low-cost configuration, has a good appearance, does not easily break the mounting bolts, and meets the user's request. Accordingly, an object of the present invention is to provide a protection device using a cylindrical protection member that can adjust the degree of slippage of the cylindrical protection member.

For this reason, the protective device according to the present invention is:
A cylindrical protective member made of resin;
A cylindrical member housed inside the cylindrical protective member made of resin;
Comprising
A protective device that is inserted into an opening provided in these substantially central portions and that is attached to an attachment counterpart by a fastening member that can be tightened in the axial direction of the cylindrical member,
A part of the cylindrical protective member made of resin is accommodated between the stepped portion between the small-diameter portion and the large-diameter portion on the outer periphery of the cylindrical member and the mounting partner, and the cylindrical member It is attached to an attachment other party so that the end surface of a small diameter part may face an attachment other party.

  In the present invention, the mounting partner may be an axle (axle) having a hollow portion at the center or a member substantially integral with the axle.

  In the present invention, the attachment partner may be an adjuster block that is provided near the rear axle of a bicycle, a bicycle with an electric assist, a motorcycle, or the like, and adjusts the amount of slack in the drive chain.

  The resin-made cylindrical protective member according to the present invention is used in the protective device according to the present invention.

  The cylindrical member according to the present invention is used in the protection device according to the present invention.

  According to the present invention, although it is a relatively simple and low-cost configuration, it has a good appearance, the mounting bolts and the like are not easily broken, and the cylindrical protective member can be slid according to the user's requirements. It is possible to provide a protection device using a cylindrical protection member whose degree can be adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS (A) is a front view of the two-wheeled vehicle protection device of Example 1 according to the embodiment of the present invention (a diagram viewed from the left-right direction of the vehicle when attached to a vehicle), and (B) is (A). It is the side view (figure seen from the vehicle front-back direction when it attaches to a vehicle) which abbreviate | omitted a part of the longitudinal direction of FIG. FIG. FIG. 2 is a perspective view showing a state in which the protection device of the first embodiment is attached to the front axle of the motorcycle (a view in which the vicinity of the front axle is extracted and displayed). Fig. 2 is a perspective view showing a state before the protection device of the first embodiment is attached to the front axle of the motorcycle (the vicinity of the front axle is extracted and displayed). (A) is a front view of the protection device for a motorcycle according to the second embodiment (viewed from the left-right direction of the vehicle when attached to a vehicle), and (B) is a side view of (A) (attached to the vehicle). (C) is a top view of (A), (D) is a cross-sectional view taken along line AA of (A), and (E) is of (A). It is a bottom view. The perspective view (the state which extracted and displayed the vicinity of a rear axle) which shows the state (state which replaced the adjuster block of standard equipment with the protection device of Example 2) which attached the protection device of Example 2 same as the above in the motorcycle. ). FIG. 11 is a diagram schematically showing an overall configuration of a conventional motorcycle (a diagram viewed from the right side of the vehicle). FIG. 7 is an enlarged view of an adjuster portion for adjusting slackness of a drive chain provided in the swing arm of the motorcycle shown in FIG. 6. It is a perspective view which shows an example of the resin-made cylindrical protection members attached to the both ends of the attachment shaft inserted in the hollow part of the conventional hollow front axle. It is a perspective view which shows an example of the resin-made cylindrical protective members attached to the both ends of the attachment shaft inserted in the hollow part of the conventional hollow rear axle. It is a perspective view which shows an example of the cylindrical protective member attached near the rear end of the adjuster block with which the conventional swing arm is equipped.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the accompanying drawings. The present invention is not limited to the embodiments described below. It should be noted that the same reference numerals are given to the elements already described and the elements in FIG. 1, and detailed description thereof is omitted here.

As shown in FIG. 1, the protection device 100 for a motorcycle of Example 1 according to the present embodiment is
A shaft 110 inserted through a hollow portion 2A in the center of the front axle (front wheel axle) 2 of the motorcycle 1;
The flanged spacers 120 and 121 that are inserted into the outer periphery of the shaft 110 and are in contact with both ends of the front axle 2, and the flanges (flange portions) 120A of the flanged spacers 120 and 121 that are inserted into the outer periphery of the shaft 110, A bottomed cylindrical collar 130 that is in contact with 121A;
A bottom portion 141 sandwiched between the step portion 133 between the small-diameter portion 131 and the large-diameter portion 132 of the collar 130 and the flange portions (flange portions) 120A and 121A of the flanged spacers 120 and 121; A cylindrical protective member 140 inserted and supported on the outer periphery of the collar 130;
A round nut 150 with a hexagonal hole accommodated in a threaded portion 111 housed inside the collar 130 and formed on the outer periphery of the shaft 110;
It is comprised including.

  The collar 130 corresponding to an example of the cylindrical member according to the present invention can be made of aluminum, titanium, duralumin, an aluminum alloy, a titanium alloy, stainless steel, iron, or other metal. However, it is made of a relatively hard resin other than metal, for example, glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic (CFRP), aramid fiber reinforced plastic (AFRP), Kevlar, which is an example of fiber reinforced plastic (FRP). Fiber reinforced plastic (KFRP), Dyneema fiber reinforced plastic (DFRP), and the like can also be used.

  In addition, the cylindrical protective member 140 corresponding to an example of the resin-made cylindrical protective member according to the present invention includes polyoxymethylene (POM), polyacetal (so-called Delrin (registered trademark), Duracon (registered trademark)), and the like. It can be made of resin.

  Further, the spacer 120 (121) can be made of aluminum, titanium, duralumin, aluminum alloy, titanium alloy, stainless steel, iron or other metal, or a relatively hard resin other than metal. The spacer 120 (121) corresponds to an example of a member that is substantially integrated with the axle according to the present invention.

  As an example of a procedure for attaching the two-wheeled vehicle protection device 100 to the front axle 2 of the two-wheeled vehicle, when the hollow portion 2A at the center of the front axle 2 of the two-wheeled vehicle 1 is empty as shown in FIG. Is inserted into the hollow portion 2A at the center of the front axle 2 and then the flanged spacer 120 is inserted into the outer periphery of the shaft 110 from the left side of FIG. 1, and the flanged spacer 121 is inserted into the outer periphery of the shaft 110 on the right side of FIG. Insert through.

  Next, a pair of left and right cylindrical protection members 140 and a pair of left and right collars 130 that are inserted and supported on the outer periphery thereof are inserted into the outer periphery of the shaft 110 from both ends, and a pair of left and right hexagonal socket nuts 150 are inserted. Are respectively combined with the threaded portions 111 on the outer periphery of the shaft 110, and a hexagon socket head circular nut 150 is attached so that the flanged spacers 120 and 121 and the collar 130 are abutted against the end portion of the front axle 2 with a hexagon wrench or the like. By tightening, the protection device 100 for two-wheeled vehicles can be attached to the front axle 2 of the two-wheeled vehicle 1 as shown in FIG.

  Thereby, according to the protection device 100 for a motorcycle according to the first embodiment, an impact at the time of the fall can be received by the relatively soft cylindrical protection member 140, and during the fall, the cylindrical protection member Since the vehicle can be supported by 140, a protective function of protecting other parts such as relatively expensive parts from damage or the like can be achieved.

  Further, as shown in FIG. 1, the protection device 100 for a motorcycle according to the first embodiment inserts the collar 130 inside the cylindrical protection member 140 and tightens the round nut 150 with a hexagonal hole, thereby fixing the collar 130. Since the end surface 134 of the cylindrical member is brought into contact with the flanged spacer 120 (121), even when a force is applied to the cylindrical protective member 140 from the lateral direction (direction intersecting the axial direction of the shaft 110) during a fall or the like. The bending deformation of the shaft 110 (corresponding to the mounting bolt) can be regulated by the presence of the collar 130 (the bending moment acting on the shaft 110 (corresponding to the mounting bolt) can be reduced) (in other words, the lateral direction When the collar 130 is inclined with respect to the axial direction of the shaft 110 due to the force, the lateral force is applied to the shaft 110 (mounting bolt). For example, it can be converted into a force in the tensile direction that is strong in strength), so that the impact at the time of overturning acts directly on the mounting bolt as a bending moment, and the mounting bolt breaks, etc. It is possible to suppress the possibility that the protective member 140 may fall off and cannot perform the protective function.

  Further, in the protection device 100 for a motorcycle according to the first embodiment, the cylindrical protection member 140 may be fixed so as not to rotate around the shaft 110 or be rotated depending on the tightening degree of the hexagonal hole nut 150. It can be supported freely. This can be realized by appropriately setting the thickness of the bottom 141 of the cylindrical protective member 140 (the thickness in the axial direction of the shaft 110).

  Therefore, polyoxymethylene (POM) or polyacetal (so-called Delrin or Duracon) has a small coefficient of friction and is dangerous because the overturned vehicle slips too much when it falls, and when it is desired to limit the slip to some extent, the round nut 150 with a hexagonal hole is used. The cylindrical protective member 140 can be fixed so as not to rotate around the shaft 110 by tightening.

In such a fixed state, the rotation (sliding condition) of the cylindrical protection member 140 is restricted, so that substantially the same position in the circumferential direction of the cylindrical protection member 140 contacts and slides on the road surface. Therefore, the contact position is worn and the inner collar 130 is exposed. For this reason, since the metal collar 130 having a relatively large friction coefficient comes into contact with the road surface and the slippage is worsened, a relatively large brake can be applied to the overturned vehicle.
That is, the impact at the time of falling can be moderated by the cylindrical protective member 140, while after sliding on the road surface to some extent, the falling vehicle can be braked and stopped. It is possible to achieve both reduction of damage and ensuring safety.

  On the other hand, on off-road bikes that run on the road surface such as sand and earth, even if it is polyoxymethylene (POM) or polyacetal (so-called Delrin or Duracon), slipping is bad, so it is better to slide more In such a case, the degree of tightening of the hexagonal socket nut 150 can be relaxed to some extent, so that the cylindrical protective member 140 can rotate around the shaft 110.

In such a rotatable state, since the cylindrical protection member 140 is easy to rotate around the shaft 110, the cylindrical protection member 140 rotates and contacts the road surface almost uniformly in the circumferential direction when it falls. Therefore, the vehicle can be stopped while decelerating at a relatively smooth degree of deceleration even when the vehicle rolls over a road surface with high frictional resistance such as sand or earth.
In other words, the impact at the time of a fall can be moderated by the cylindrical protective member 140, while the fall of the road surface with a large frictional resistance is suppressed to suppress a sudden deceleration at the time of the fall and is relatively smooth. The falling vehicle can be stopped while decelerating at a deceleration degree, and both reduction of damage to the vehicle according to the traveling road surface and securing of safety can be achieved.

  Moreover, when it is set as this rotatable state, since the circumference | surroundings of the cylindrical protection member 140 can be worn comparatively equally, the deterioration of the appearance after falling etc. can also be suppressed.

  Further, the collar 130 is configured as an inner ring and the cylindrical protective member 140 is configured as an outer ring, and the collar 130 is exposed to the surface, so that the metal collar 130 can be colored in various colors (such as anodized). As compared with the conventional case where only the cylindrical protective member 140 is exposed, the appearance can be improved and various hobbies and preferences of various users can be met. Become.

  As described above, according to the first embodiment, although it is a relatively simple and low-cost configuration, the appearance is good, the mounting bolts and the like are not easily broken, and according to the user's request or the like. It is possible to provide a protection device using a cylindrical protection member that can adjust the degree of slippage of the cylindrical protection member.

  The threaded portion 111 on the outer periphery of the shaft 110 can be provided in the vicinity of both ends, and can be a full-circular screw threaded over the entire length of the shaft 110.

  In the first embodiment, as shown in FIG. 1, the flanged spacers 120 and 121 are illustrated as asymmetrical, but this is due to the specifications and shape of the vicinity of the front axle to be attached, and the present invention. The flanged spacers 120 and 121 are not limited to such a shape, and can be appropriately designed according to specifications, shapes, and the like in the vicinity of the front axle.

As shown in FIG. 4, the protection device 200 for a motorcycle according to the second embodiment is provided.
An adjuster block 210 that can be used to adjust the drive chain of the rear axle (rear wheel axle) 3 of the motorcycle 1;
Hexagon socket head cap screw 220 that is screwed into a screw hole 211 that is opened near the rear end of the adjuster block 210;
A bottomed cylindrical collar 130 that is inserted into the outer periphery of the hexagon socket head bolt 220 and fastened and fixed to the adjuster block 210 by the hexagon socket head bolt 220;
A cylindrical protective member 140 having a bottom portion 141 sandwiched between the step portion 133 between the small diameter portion 131 and the large diameter portion 132 of the collar 130 and the adjuster block 210 and inserted through the outer periphery of the collar 130. When,
It is comprised including.
The protection device 200 for a motorcycle according to the second embodiment is attached to the swing arm 4 of the motorcycle 1 as a pair of left and right.

  The adjuster block 210 is provided with a rear axle opening 212 through which the end of the rear axle 3 is inserted, and has a flat surface 213 that faces the tip of the adjuster bolt 6.

  The adjuster block 210 is fastened and fixed to the swing arm 4 by a mounting nut 9 that is screwed into an end portion of the rear axle 3 inserted through the rear axle opening 212.

  Further, the adjuster block 210 is provided with a mark 214 that can be used for confirming the relative position of the adjuster block 210 with respect to the swing arm 4. By using the mark 214, the slack of the drive chain is adjusted. Can be accurately performed, and the rear axle 3 can be arranged so as to be accurately orthogonal to the vehicle longitudinal direction by matching the marking positions of the pair of left and right adjuster blocks 210.

  The material of the adjuster block 210 can be made of aluminum, titanium, duralumin, an aluminum alloy, a titanium alloy, stainless steel, iron, or other metal. However, it is made of a relatively hard resin other than metal, for example, glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic (CFRP), aramid fiber reinforced plastic (AFRP), Kevlar, which is an example of fiber reinforced plastic (FRP). Fiber reinforced plastic (KFRP), Dyneema fiber reinforced plastic (DFRP), and the like can also be used.

  Further, since it is assumed that the screw thread of the screw hole 211 provided in the adjuster block 210 may be damaged by tightening of the hexagonal socket head bolt 220 or the like, a screw insert (insert coil, helicate (registered trademark) is inserted into the screw hole 211. )) Etc. can be inserted in advance to increase the strength of the thread.

  Further, the collar 130 can be made of aluminum, titanium, duralumin, aluminum alloy, titanium alloy, stainless steel, iron or other metal, or a relatively hard resin other than metal as in the first embodiment. .

  The cylindrical protective member 140 can be made of polyoxymethylene (POM) or polyacetal (so-called Delrin (registered trademark) or Duracon (registered trademark)) or other resin as in the first embodiment.

  As with the first embodiment, the two-wheeled vehicle protection device 200 according to the second embodiment can receive an impact during a fall by the relatively soft cylindrical protective member 140. Since the vehicle can be supported by the shape protection member 140, a protective function of protecting other parts such as relatively expensive parts from damage or the like can be achieved.

  Further, as shown in FIG. 5, in the protection device 200 for a motorcycle according to the second embodiment, the adjuster block 210 inserts both ends of the axle shaft 3 into the rear axle opening 212 and is fastened and fixed to the swing arm 4 by a fastening nut. Therefore, when adjusting the slack (tension) of the drive chain and the drive chain as compared with the type inserted through the hollow portion in the center of the axle shaft (the type of the protective device 100 of the first embodiment). In addition, it is possible to eliminate the necessity of detaching the cylindrical protective member 140 each time, to improve workability, and to prevent the impact from being directly transmitted to the rear axle shaft 3 at the time of the fall. Etc. can also be reduced.

  In the protection device 200 for a motorcycle according to the second embodiment, the collar 130 is inserted into the cylindrical protection member 140 and the hexagon socket head cap screw 220 is tightened, so that the end face 134 of the collar 130 is adjusted to the adjuster block 210. Even when a force is applied to the cylindrical protective member 140 from the lateral direction (direction intersecting the axial direction of the hexagon socket headed circular bolt 220) at the time of falling or the like, The bending deformation of the holed bolt 220 (corresponding to the mounting bolt) can be restricted (the bending moment acting on the hexagonal holed bolt 220 (corresponding to the mounting bolt) can be reduced) (in other words, the lateral direction) When the collar 130 is inclined with respect to the axial direction of the hexagon socket head bolt 220 by the force of Because the hexagon socket head bolt 220 (equivalent to the mounting bolt) can be converted into a strong force in the pulling direction), the impact at the time of falling acts as a bending moment directly on the mounting bolt as in the past. It is possible to suppress the possibility that the bolt breaks or the like, and the cylindrical protective member 140 falls off and cannot perform its protective function.

  Also in the two-wheeled vehicle protection device 200 according to the second embodiment, the cylindrical protection member 140 may be moved around the hexagon socket head circular bolt 220 depending on the tightening degree of the hexagon socket head bolt 220 as in the first embodiment. It can be fixed so that it does not rotate, or it can be rotatably supported. This can be realized by appropriately setting the thickness of the bottom portion 141 of the cylindrical protective member 140 (the thickness in the axial direction of the hexagon socket headed circular bolt 220).

  Therefore, polyoxymethylene (POM) or polyacetal (so-called Delrin or Duracon) has a small coefficient of friction and is dangerous because the overturned vehicle slips too much when it falls, and when it is desired to restrict the slip to some extent, the hexagon socket head bolt 220 The cylindrical protective member 140 can be fixed so as not to rotate around the shaft 110 by tightening.

In such a fixed state, the rotation (sliding condition) of the cylindrical protection member 140 is restricted, so that substantially the same position in the circumferential direction of the cylindrical protection member 140 contacts and slides on the road surface. Therefore, the contact position is worn and the inner collar 130 is exposed. For this reason, since the metal collar 130 having a relatively large friction coefficient comes into contact with the road surface and the slippage is worsened, a relatively large brake can be applied to the overturned vehicle.
That is, the impact at the time of falling can be moderated by the cylindrical protective member 140, while after sliding on the road surface to some extent, the falling vehicle can be braked and stopped. It is possible to achieve both reduction of damage and ensuring safety.

  On the other hand, on off-road bikes that run on the road surface such as sand and earth, even if it is polyoxymethylene (POM) or polyacetal (so-called Delrin or Duracon), slipping is bad, so it is better to slide more In such a case, the tightening degree of the hexagon socket head bolt 220 is loosened to some extent, so that the cylindrical protective member 140 can rotate around the hexagon socket head bolt 220. be able to.

In such a rotatable state, the cylindrical protective member 140 is easy to rotate around the hexagon socket headed circular bolt 220. Therefore, the cylindrical protective member 140 rotates to make the circumferential direction substantially uniform during a fall. Since the vehicle rolls while being in contact with the road surface, the overturning vehicle can be stopped while decelerating with a relatively smooth degree of deceleration even when the road surface with a large frictional resistance such as a road surface such as sand or earth falls.
In other words, the impact at the time of a fall can be moderated by the cylindrical protective member 140, while the fall of the road surface with a large frictional resistance is suppressed to suppress a sudden deceleration at the time of the fall and is relatively smooth. The falling vehicle can be stopped while decelerating at a deceleration degree, and both reduction of damage to the vehicle according to the traveling road surface and securing of safety can be achieved.

  Moreover, when it is set as this rotatable state, since the circumference | surroundings of the cylindrical protection member 140 can be worn comparatively equally, the deterioration of the appearance after falling etc. can also be suppressed.

  Further, the collar 130 is configured as an inner ring and the cylindrical protective member 140 is configured as an outer ring, and the collar 130 is exposed to the surface, so that the metal collar 130 can be colored in various colors (such as anodized). As compared with the conventional case where only the cylindrical protective member 140 is exposed, the appearance can be improved and various hobbies and preferences of various users can be met. Become.

  As described above, according to the second embodiment, although the structure is relatively simple and low-cost, the appearance is good, the mounting bolt or the like is not easily broken, and the cylinder according to the user's request or the like. It is possible to provide a protection device using a cylindrical protection member that can adjust the degree of slippage of the shape protection member.

  It is also possible to attach the same protective device 100 as in the first embodiment using the central hollow portion 3A of the rear axle 3.

  In the present embodiment, for example, a case where the protection devices 100 and 200 are attached to a motorcycle has been described as an example. However, the present invention is not limited to this, and a bicycle, a bicycle with an electric assist, and a bicycle with a prime mover. In addition to motorcycles such as motorcycles, the invention can also be applied to devices having wheels such as tricycles, unicycles, and other transport vehicles (carriers).

  The present invention is not limited to the embodiments of the invention described above, and various modifications can be made without departing from the gist of the present invention.

1 Motorcycles (motorcycles, etc.)
2 Front axle (front axle) (example of mounting partner)
2A Hollow part of the front axle 3 Rear axle (rear axle)
3A Hollow part of rear axle 4 Swing arm 100 Protection device for two-wheeled vehicle (Example 1)
110 Shaft 111 Thread (Outer Thread of Shaft 110)
120 Spacer with hook (member almost integrated with axle) (an example of mounting partner)
121 Spacer with a flange (a member that is almost integral with the axle) (an example of a mounting partner)
120A collar (flange)
121A collar (flange)
130 Color (cylindrical member)
131 Small-diameter portion 132 Large-diameter portion 133 Step portion 134 End surface 140 Cylindrical protective member 141 Bottom portion (corresponding to a part of the cylindrical protective member according to the present invention)
150 Hexagonal round nut 200 Protection device for a motorcycle (Example 2)
210 Adjuster block (example of mounting partner)
211 Screw hole 220 Hexagon socket head bolt

Claims (5)

A cylindrical protective member made of resin;
A cylindrical member housed inside the cylindrical protective member made of resin;
Comprising
A protective device that is inserted into an opening provided in these substantially central portions and that is attached to an attachment counterpart by a fastening member that can be tightened in the axial direction of the cylindrical member,
A part of the cylindrical protective member made of resin is accommodated between the stepped portion between the small-diameter portion and the large-diameter portion on the outer periphery of the cylindrical member and the mounting partner, and the cylindrical member A protective device, wherein the protective device is attached to an attachment partner such that an end surface of the small diameter portion faces the attachment partner.   The protection device according to claim 1, wherein the attachment partner is an axle having a hollow portion in the center or a member substantially integral therewith.   2. The protection device according to claim 1, wherein the attachment partner is an adjuster block provided near the rear axle for adjusting the amount of slack in the drive chain.   A resin-made cylindrical protective member, which is used for the protective device according to any one of claims 1 to 3. A cylindrical member used in the protective device according to any one of claims 1 to 3.