JP2011163550A - Suspension - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems wherein a gas chamber inside is brought into high pressure to prevent bottoming, in a conventional air suspension, and wherein frictional resistance increases in a seal member provided to slide in an outer body and an inner tube, since the gas chamber inside is brought into the high pressure, to prevent a smooth operation, and a problem wherein the whole stroke is used up to bring easily the bottoming, when the gas chamber inside is reduced to conduct the smooth operation of the suspension with priority, and wherein a traveling behavior of a vehicle gets unstable therein. <P>SOLUTION: This suspension includes a piston rod 6a inserted slidably with the inner tube 2a into the outer body 1a via the seal member 9a, and attached to an outer body side in an inside of the inner tube, and a damper part attached with a piston valve provided via the piston rod, and magnetic members are disposed in a piston valve tip and an inner tube inside bottom part, to generate a repulsion between the magnet members, in the suspension. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention mainly relates to a suspension for a two-wheeled vehicle, and more particularly to a suspension provided with a bottoming prevention mechanism for preventing or buffering bottoming when the suspension is most compressed.

  As a suspension that absorbs vibrations received from the road surface, an inner tube is slidably inserted into the outer body, an air spring or a metal spring is provided, and a piston rod attached to the outer body side in the inner tube and a piston rod tip 2. Description of the Related Art A suspension is known that is provided with a damper that damps vibrations of an air spring or a metal spring, to which a piston valve is attached. Some have a free piston or reservoir tank.

  When a large impact force is input to the suspension and it reaches the maximum compression state, a phenomenon of bottoming occurs, and the behavior of the vehicle becomes unstable. Furthermore, the bottoming may damage the suspension mechanical components. In order to avoid these, a bottoming prevention mechanism may be provided at the stroke limit. For example, the front fork disclosed in Patent Document 1 has a configuration in which, in the most compressed state, an oil lock structure provided with an oil lock case and an oil lock piece prevents excessive compression and receives impact force. .

JP 2005-257066 A

  The suspension provided with the oil lock mechanism as described in Patent Document 1 is not particularly defective in terms of function. However, the conventional air suspension is desired to improve the following problems.

  The conventional air suspension has a function as an air spring from the change in volume of the gas chamber in which the gas is sealed in the outer body and the change in the internal pressure associated therewith, but in order to prevent bottoming out, High pressure.

  The high pressure in the gas chamber provided in the outer body increases the frictional resistance of the seal members provided for sliding on the outer body and the inner tube, thereby enabling smooth operation of the suspension. There is a problem of obstructing.

  On the other hand, when the pressure in the gas chamber is lowered and priority is given to the smooth operation of the suspension, there is a problem that the entire stroke is used up and easily settles down and the running behavior of the vehicle becomes unstable.

  The present invention is intended to solve the problems of the conventional configuration as described above, and is a configuration capable of preventing or buffering the bottoming even when the gas chamber in the outer body has a lower pressure than the conventional configuration. An object of the present invention is to provide a suspension provided with

  In order to achieve the above object, according to the present invention, the inner tube is slidably inserted into the outer body through the seal member and attached to the outer body side in the inner tube. In a suspension having a piston rod and a damper portion to which a piston valve provided via the piston rod is attached, a magnet member is provided at the piston valve tip and the inner tube inner bottom so that a repulsive force is generated between the magnet members. It is the suspension characterized by having been comprised.

  According to the second aspect of the present invention, the magnet member is provided in the inner tube end portion on the outer body insertion side and in the outer body that is in the vicinity of the inner tube end portion at the time of compression, and a repulsive force is generated between the magnet members. The suspension according to claim 1.

  The invention of claim 3 comprises a free piston that divides the inner tube into an oil chamber and a gas chamber, the magnet member is provided in the free piston, and a repulsive force is generated between the magnet members. The suspension according to claim 1.

  The invention of claim 4 includes a reservoir tank and a free piston that divides the interior of the reservoir tank into an oil chamber and a gas chamber, the magnet member is provided in the compression adjuster of the free piston and the reservoir tank, and the repulsive force between the magnet members The suspension according to claim 1, wherein the suspension is configured to occur.

  According to the first aspect of the present invention, the inner tube is slidably inserted into the outer body via the seal member, the piston rod attached to the outer body side in the inner tube, and the piston rod is provided via the piston rod. In the suspension having the damper portion to which the piston valve is attached, the magnet member is provided at the piston valve tip and the inner tube inner bottom, and a repulsive force is generated between the magnet members. Therefore, at the time of the maximum compression, the repulsive force between the magnet members made of permanent magnets or electromagnets provided at the final part of the suspension stroke prevents excessive compression, that is, bottoming out even if the gas chamber in the outer body is at a low pressure. You can expect to buffer.

  In addition to the invention of claim 1, the invention of claim 2 provides a magnet member in the inner tube end on the outer body insertion side and in the outer body that is in the vicinity of the inner tube end at the time of compression, and between the magnet members The repulsive force is generated. Therefore, the repulsive force generated between the magnet members is larger than that of the first aspect, and even when the gas chamber in the outer body is at a lower pressure, it can be expected to prevent or buffer excessive compression, that is, bottoming.

  According to the invention of claim 3, in addition to the invention of claim 1, a free piston that divides the inner tube into an oil chamber and a gas chamber is provided, the magnet member is provided in the free piston, and a repulsive force is generated between the magnet members. It is configured to occur. Since the oil chamber and the gas chamber in the inner tube are partitioned by a free piston, there is no restriction on the installation direction due to the boundary surface between the liquid level and the gas. Even if the gas chamber in the outer body is at a lower pressure due to the repulsive force generated between the magnet member provided on the free piston, the piston valve tip in claim 1 and the magnet member provided on the inner bottom of the inner tube, It can be expected to prevent or buffer excessive compression or bottoming.

  According to the invention of claim 4, in addition to the invention of claim 1, a reservoir tank and a free piston that divides the inside of the reservoir tank into an oil chamber and a gas chamber are provided, and the magnet member is a compression of the free piston and the reservoir tank. The adjuster is provided so that a repulsive force is generated between the magnet members. In addition, since the free piston that divides the oil chamber and the gas chamber is provided in the reservoir tank, there is no limitation on the installation direction of the suspension due to the boundary surface between the liquid level and the gas. By adjusting the position of the magnet member provided in the compression adjuster of the reservoir tank and the magnet member of the free piston provided in the reservoir tank with the compression adjuster, the repulsive force can be arbitrarily changed. The repulsive force can be adjusted. Further, as in the first aspect, even if the gas chamber in the outer body is at a low pressure, it can be expected to prevent or buffer excessive compression, that is, bottoming.

  Therefore, according to the first, second, third, and fourth inventions, the gas pressure in the gas chamber in the outer body can be set lower than the conventional one, and the outer body and the inner tube are respectively slid. The frictional resistance of the sealing member provided to reduce is reduced, and smooth operation can be expected.

  According to the first, second, third, and fourth aspects of the invention, in the most compressed state, the rebound force between the magnet members can be expected to improve the ride comfort and the feeling of waist or struts at the back of the stroke.

  Furthermore, when the magnet member is provided as an electromagnet, it is possible to adjust the waist feeling or the tension feeling at the back of the stroke by electrically controlling the magnetic force of the electromagnet.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway longitudinal front view of a bicycle rear suspension embodying claim 1 of the present invention. FIG. 6 is a partially cutaway longitudinal front view of a bicycle rear suspension embodying claim 2 of the present invention. FIG. 5 is a partially cutaway longitudinal front view of a bicycle rear suspension including a free piston embodying claim 3 of the present invention. FIG. 6 is a partially cutaway longitudinal front view of a bicycle rear suspension including a free piston and a reservoir tank according to claim 4 of the present invention. 1 is a partially cutaway front view of a front fork for a motorcycle according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention can be applied to various types of suspensions and mainly relates to suspensions for two-wheeled vehicles. Therefore, the form which implemented this invention to the rear suspension mounted in a bicycle is shown in FIGS. 1-3, and is demonstrated based on each figure. FIG. 4 shows an example in which the present invention is applied to a front fork that is a suspension mounted on a front wheel portion of a motorcycle.

  FIG. 1 shows an embodiment in which the present invention is applied to a rear suspension of a bicycle. In the rear suspension, the inner tube 2a is slidably inserted into the outer body 1a via the seal members 9a and 9b, and the outer body 1a is filled with high-pressure gas. The interior includes an oil chamber 4 and gas chambers 5a and 5b. The oil chamber 4 includes a piston rod 6a attached to the outer body 1a and a piston valve 8a provided via the piston rod 6a. ing.

  The piston valve 8a divides the oil chamber 4 in the inner tube 2a into two chambers, an oil chamber upper portion 4a and an oil chamber lower portion 4b. The piston valve 8a is provided with an oil path (not shown) for oil to move between the two chambers. Further, the oil path is provided with an element that generates a damping force when oil passes, and for example, a piston valve 8a having an orifice, a leaf valve, a port, and the like can be employed.

  In the present invention, the magnet members 7a and 7b are further provided at the tip of the piston valve 8a and the inner bottom portion of the inner tube 2a so that a repulsive force is generated between the magnet members.

  In addition, as shown in FIG. 2, the magnet members 7c and 7d are provided in the end of the inner tube 2a on the outer body 1a insertion side and in the outer body 1a in the vicinity of the end of the inner tube 2a at the time of the most compression. You may comprise so that force may generate | occur | produce.

  Further, as shown in FIG. 3, in the configuration including the free piston 3a that divides the inner tube 2a into the oil chamber 4 and the gas chamber 5c, the magnet member 7e is provided in the free piston 3a, and the repulsive force is generated between the magnet members. May be configured to occur. The free piston 3a provided in the inner tube 2a is slidably inserted into the inner tube 2a.

  In addition, as shown in FIG. 4, in the configuration including the reservoir tank 10 and the free piston 3b that divides the reservoir tank 10 into the oil chamber 4 and the gas chamber 5d, the magnet members 7f and 7g are connected to the free piston 3b. Alternatively, it may be provided in the compression adjuster 11 of the reservoir tank 10 so that a repulsive force is generated between the magnet members. The free piston 3 b provided in the reservoir tank 10 is slidably inserted into the reservoir tank 10.

  The above-described magnet members 7a, 7b, 7c, 7d, 7e, 7f, and 7g can be attached to any location, but magnetic members are used as members for attachment so as not to weaken the magnetic force of the magnet members. In addition, it is one method to attach the magnet member using an adhesive. Furthermore, it is desirable not to arrange a magnetic body in the vicinity of the magnet member.

  The common operation of the above configuration will be described below with reference to FIG. When the suspension body is compressed, when the outer body 1a is viewed as the fixed side, the inner tube 2a enters the outer body 1a and the gas sealed in the gas chamber 5a in the outer body 1a is compressed. At the same time, the piston valve 8a approaches the bottom of the inner tube 2a.

  Further, the oil in the oil chamber upper portion 4a moves to the oil chamber lower portion 4b through the piston valve 8a and generates a compression side damping force. The gas chamber 5b in the inner tube 2a functions as an air spring portion.

  During the extension operation following the compression operation, when the outer body 1a is viewed as the fixed side, the inner tube 2a rises, and at this time, the oil in the oil chamber lower portion 4b flows out to the oil chamber upper portion 4a via the piston valve 8a. Generates side damping force.

  Next, the operation of the configuration for each claim will be described. First, the operation of claim 1 will be described with reference to FIG. As the compression operation approaches the vicinity of the most compressed state, the gap between the tip of the piston valve 8a and the magnet members 7a and 7b provided at the inner bottom portion of the inner tube 2a is narrowed. Even if the inner gas chamber 5a is at a low pressure, it can be expected to prevent or buffer excessive compression, that is, bottoming out.

  The operation of claim 2 will be described with reference to FIG. In addition to the operation of the first aspect at the time of the compression operation, in the second aspect, the magnet members 7c and 7d are arranged in the outer tube 1 end on the insertion side of the outer body 1a and the outer tube which is close to the end of the inner tube 2a at the time of the most compression. Since it is provided in the body 1a and is configured so that a repulsive force is generated between the magnet members, the repulsive force generated between the magnet members is larger than that of the first aspect, and the gas chamber 5a in the outer body 1a has a lower pressure. Even so, it can be expected to prevent or buffer excessive compression, ie, bottoming.

  The operation of claim 3 will be described with reference to FIG. In the compression operation, in addition to the operation of claim 1, in claim 3, when the piston rod 6 a enters the inner tube 2 a, the free piston 3 a moves by the volume of the piston rod 6 a that has entered to secure a volume. Since the oil chamber 4 and the gas chamber 5c in the inner tube 2a are partitioned by the free piston 3a, there is no restriction on the installation direction due to the boundary surface between the liquid level and the gas. Due to the repulsive force generated between the magnet member 7e provided on the free piston 3a, the tip of the piston valve 8a in claim 1 and the magnet member provided on the inner bottom of the inner tube 2a, the gas chamber 5a in the outer body 1a is more Even at low pressures, it can be expected to prevent or buffer excessive compression, ie bottoming out.

  The operation of claim 4 will be described with reference to FIG. In the compression operation, in addition to the operation of claim 1, in claim 4, when the piston rod 6a enters the inner tube 2a, the free piston 3b in the reservoir tank 10 moves by the volume of the piston rod 6a that has entered. Secure volume. Further, since the reservoir tank 10 is provided with the free piston 3b that partitions the oil chamber 4 and the gas chamber 5d, there is no restriction on the installation direction of the suspension due to the boundary surface between the liquid level and the gas. By adjusting the position of the magnet member 7g provided in the compression adjuster 11 of the reservoir tank 10 and the magnet member 7f of the free piston 3b provided in the reservoir tank 10 with the compression adjuster 11, the repulsive force can be arbitrarily set. Since it can be changed, the repulsive force can be adjusted. As in the first aspect, even if the gas chamber 5a in the outer body 1a is at a low pressure, it can be expected to prevent or buffer excessive compression, that is, bottoming.

  As described above, according to the present embodiment, the bottom pressure can be prevented or buffered by the repulsive force between the magnet members in the vicinity of the most compressed state, so that the gas pressure in the gas chamber 5a in the outer body 1a is reduced. It becomes possible to set it lower than before, and the frictional resistance of the seal members 9a and 9b provided to slide on the outer body 1a and the inner tube 2a is reduced, and smooth operation can be expected. .

  In addition, the repulsive force between the magnet members can be expected to improve riding comfort and a feeling of waist or struts at the back of the stroke.

  Furthermore, when the magnet member is provided as an electromagnet, it is possible to adjust the waist feeling or the tension feeling at the back of the stroke by electrically controlling the magnetic force of the electromagnet.

  FIG. 5 shows an example in which the present invention is applied to a front fork. The magnet members 7h and 7k are provided in the end portion of the inner tube 2b on the outer body 1b insertion side and the outer body 1b in the vicinity of the end portion of the inner tube 2b at the time of compression, so that a repulsive force is generated between the magnet members. is doing. Therefore, the effect of the present invention can be expected for a front fork that is one suspension.

1a, 1b Outer body 2a, 2b Inner tube 3a, 3b Free piston 4 Oil chamber 4a Oil chamber upper 4b Oil chamber lower 5a, 5b, 5c Gas chamber 6a, 6b Piston rods 7a, 7b, 7c, 7d, 7e, 7f, 7g, 7h, 7k Magnet members 8a, 8b Piston valves 9a, 9b Seal member 10 Reservoir tank 11 Compression adjuster

Claims (4)

  A damper part in which an inner tube is slidably inserted into the outer body via a seal member, a piston rod attached to the outer body side in the inner tube, and a piston valve provided via the piston rod are attached A suspension having a structure in which a magnet member is provided at a piston valve tip and an inner tube inner bottom so that a repulsive force is generated between the magnet members.   The magnet member is provided in the inner tube end on the outer body insertion side and in the outer body that is in the vicinity of the inner tube end at the time of maximum compression, and a repulsive force is generated between the magnet members. Item 2. The suspension according to Item 1.   The free piston which divides the inside of an inner tube into an oil chamber and a gas chamber is provided, a magnet member is provided in a free piston, and it was constituted so that a repulsive force might be generated between magnet members. suspension.   A reservoir tank and a free piston that divides the interior of the reservoir tank into an oil chamber and a gas chamber are provided, and a magnet member is provided in the free piston and a compression adjuster of the reservoir tank so that a repulsive force is generated between the magnet members. The suspension according to claim 1.

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