JP5564340B2 - Cover mounting structure - Google Patents

Description

  The present invention relates to a cover mounting structure, and more particularly, to a front fork that is a hydraulic shock absorber that is mounted on the front wheel side of a two-wheeled vehicle and absorbs road surface vibration that is input to the front wheel while suspending the front wheel of the two-wheeled vehicle. The present invention relates to an improvement of a cover mounting structure.

  As a cover mounting structure suitable for the realization of a front fork, which is a hydraulic shock absorber that is mounted on the front wheel side of a motorcycle and absorbs road surface vibrations input to the front wheel while suspending the front wheel of the motorcycle, I have a suggestion.

  Among them, for example, Patent Document 1 discloses a cover formed in a cylindrical shape that covers a protruding portion of an inner tube protruding from the outer tube so as to be blocked from the outside (front fork set upright). Proposals have been disclosed that may be referred to as protectors).

  That is, as disclosed in Patent Document 1, the cover that covers the protruding portion of the inner tube is formed in a manner that is vertically divided by a metal material, and the upper cover portion is suspended from the upper end of the inner tube. The lower cover part is suspended by using a bolt and nut on an under bracket that constitutes a bridge that holds the upper end of the inner tube.

  Therefore, the cover mounting structure disclosed in Patent Document 1 has a problem of increasing the number of parts and requiring labor for assembly. Therefore, the cover mounting having a simple configuration as shown in FIG. A structure can be proposed.

  That is, in the proposal shown in FIG. 4, the front fork is set upright, and the cover 1 formed in a cylindrical shape is press-fitted and held in the small-diameter portion 2 b constituting the upper end portion 2 a of the outer tube 2. The protruding portion 3a of the inner tube 3 protruding from the outer tube 2 is covered so as to be blocked from the outside.

  At this time, the cover 1 is made of, for example, an iron material, and the lower end portion 1a is press-fitted into the outer periphery of the small diameter portion 2b of the upper end portion 2a of the outer tube 2, and the lower end 1b is formed between the upper end portion 2a and the small diameter portion 2b. It is made to contact | abut to the level | step-difference part 2c between, and a mischievous gap is made not to appear.

  On the other hand, the outer tube 2 is formed at the upper end portion 2a and the upper end opens into the stepped portion 2c to expose the lower end 1b of the cover 1, and from the outside of the outer tube 2 The tool has a notch recess 2d that allows insertion into the inside of the tip of the minus driver D, for example.

  Incidentally, when the cutout recess 2d is viewed from the so-called front side, as shown in a virtual diagram in the figure, for example, it is formed in a horizontally long rectangle so as to facilitate the insertion operation of the tip of the minus driver D. Considered.

  Therefore, in the proposal shown in FIG. 4, the lower end portion 1 a of the cover 1 that is lowered from above as the inner tube 3 is inserted is press-fitted into the small diameter portion 2 b of the upper end portion 2 a of the outer tube 2. The cover 1 can be attached to the upper end portion 2a of the outer tube 2 without requiring several attachment parts.

Japanese Patent Laid-Open No. 11-132278 (Summary, see FIG. 1)

  However, in the cover mounting structure shown in FIG. 4 described above, it is basically possible to mount the cover 1 on the outer tube 2 by simply press-fitting the cover 1 without requiring several mounting parts. Although there is no problem, there is a possibility that it may be pointed out that there is a minor defect when considering the actual use.

  That is, in the front fork, the dust seal 5 that exposes the inner periphery to the outer periphery of the inner tube 3 while being disposed at the upper end portion 2a of the outer tube 2 is exposed inside the cover. 5 functions so that dust such as mud attached to the outer periphery of the inner tube 3 is scraped off and does not enter the outer tube 2.

  Therefore, for example, when the dust seal 5 deteriorates with time, it is necessary to replace it. In this case, it is necessary to remove the cover 1 held by the outer tube 2. In the structure, it is necessary to apply a so-called large external force to the lower end 1 b of the cover 1 because the cover 1 is press-fitted into the outer tube 2.

  In other words, the upper end 2a of the outer tube 2 is formed with a notch recess 2d that opens to the step 2c in the outer tube 2 with which the upper end abuts the lower end 1b of the cover 1. As shown in the figure, by inserting the tip of the flat-blade screwdriver D as a tool and applying an external force to the lower end 1b of the cover 1 by hitting the rear end of the flat-blade screwdriver D from this state, The tube 2 can be removed from the upper end 2a.

  As a result, when the cover 1 is removed, the tip of the flat-blade screwdriver D, which is a tool, may be so sharp that the lower end 1c of the cover 1 is easily damaged, and the lower end 1a of the cover 1 is damaged. There is a problem that the reuse is not preferable.

  The present invention has been developed in view of the above-described present situation, and the object of the present invention is to facilitate the attachment of the cover to the outer tube and to remove the cover without fear of being damaged. It is possible to reuse the cover by making it possible, and to provide a cover mounting structure that is optimal for expecting improved versatility.

In order to achieve the above object, the problem-solving means of the present invention is such that the inner tube is inserted into the outer tube so that it can protrude and retract, and a cylindrical cover that covers the protruding portion of the inner tube protruding from the outer tube is connected. In the cover mounting structure that is separably attached to the outer tube under the arrangement of the snap ring formed so as to be able to be released ,
An outer annular groove is formed on the outer peripheral side of the outer tube,
Forming an inner annular groove facing the outer annular groove on the inner peripheral side of the cover;
The snap ring has a main body portion that is bent in a C shape, and both end portions that are formed at the end portions of the main body portion and serve as input portions for external force,
While the main body portion is reduced in diameter when an external force is applied to both ends, the diameter is increased when the external force is applied to both ends, while the enlarged diameter portion that fits in the inner annular groove is expanded in the circumferential direction. In addition, a reduced diameter portion that fits into the outer annular groove when the main body portion is reduced in diameter is provided between the enlarged diameter portions so that the cover and the outer tube In addition to enabling connection, the cover can be separated from the outer tube when the diameter is reduced.

  Therefore, in the present invention, the snap ring that fits into the outer annular groove formed in the outer tube is cut off, and the cover is covered in a state where the diameter is reduced by the action of an external force applied to both end portions that are made of end portions and are used as external force input portions. It is possible to connect the cover to the outer tube by eliminating the external force input to both ends and expanding the snap ring after connecting the outer tube to the cover. become.

  Then, from the state in which the cover is connected to the outer tube, it is possible to separate the cover from the outer tube by applying an external force to both ends to reduce the diameter of the snap ring. Since an extra external force is not applied, the cover is not damaged and can be reused.

It is a partial front view which shows the intermediate part of the front fork which embodied one Embodiment of the cover attachment structure by this invention. It is a figure which shows a snap ring, Comprising: (A) is a top view, (B) is a longitudinal cross-sectional view shown by the XX position in (A). It is a partial front view which shows the arrangement | positioning state of a snap ring. It is a figure which shows the front fork which actualized the cover attachment structure used as a prior art example substantially the same as FIG.

  Hereinafter, the present invention will be described based on the illustrated embodiment. The cover mounting structure according to the present invention is embodied in a front fork set upright, for example, as shown in FIG.

  The cover mounting structure according to the present invention basically has the same configuration as that of the conventional cover mounting structure shown in FIG. 4 described above, but has a snap ring 4 formed so as to be disengageable. There is a feature in what is done.

  In the following description, first, the front fork is inserted into the upper end side of the outer tube 2 serving as the wheel side member so that the lower end side of the inner tube 3 serving as the handle side member can protrude and retract.

  Incidentally, although not shown, for example, a cylindrical damper is disposed inside the fork main body formed by the outer tube 2 and the inner tube 3, and this damper is set to, for example, an upright type fork. It is arrange | positioned at the axial center part of a main body.

  At this time, although not shown in the figure, the damper is inserted into the cylinder body standing on the shaft core portion of the outer tube 2 so that the rod body, which is a piston rod suspended from the shaft core portion of the inner chew 3, is retractable. A predetermined attenuating action is realized by the attenuating means of the piston portion that is held at the tip of the rod body and slides within the cylinder body when the rod body is extended and retracted relative to the body.

  Although not shown in the drawing, the fork main body is a reservoir in the damper and contains a working fluid that flows into and out of the damper, and the reservoir has an air chamber that borders the working fluid and the liquid surface. The air spring force exerted by the expansion and contraction of the chamber is the so-called tube reaction force.

  On the other hand, the inner tube 3 protrudes and protrudes from the upper end portion 2a of the outer tube 2. The upper end portion 2a of the outer tube 2 is not illustrated, but a seal is provided on the inner side to allow the inner tube 3 to protrude and protrude under a liquid-tight state. The sealing case part which has is comprised.

  Incidentally, in the place shown in FIG. 1, reference numeral 5 is a dust seal held on the inner periphery of the narrow diameter portion 2 b at the upper end portion 2 a of the outer tube 2, and this dust seal 5 is the outer tube 2 in the inner tube 3. Scatter off dust, such as fine sand or muddy water, that may adhere to the outer periphery of the protruding portion 3a from the inside.

  Although not shown in the drawing, an oil seal is also provided below the dust seal 5 and is held on the inner periphery of the upper end 2a. Prevent leakage.

  Whereas the front fork is formed as described above, the cover 1 is formed in a cylindrical shape and is provided so as to block the protruding portion 3a of the inner tube 3 from the outside. For example, it is configured such that it is not easily broken by a collision of stepping stones.

  By the way, in this invention, since the snap ring 4 is used to hold the cover 1 on the outer tube 2 in the front fork, the cover 1 has an inner annular shape to which the snap ring 4 is fitted. The formation of the inner annular groove 1d in the groove 1d, that is, the inner peripheral side portion of the lower end portion 1a of the cover 1, is essential. From the viewpoint of forming the inner annular groove 1d, the cover 1 is formed thick. It is preferable.

  At this time, if the cover 1 is made of an iron material, it leads to a problem of increasing the weight. However, if the cover 1 is made of a resin material, the weight is reduced and the cost is advantageous, and further, the appearance is improved and the design effect is improved. Coloring and plating to enhance it are also possible.

  Therefore, in the illustrated embodiment, it is assumed that the cover 1 is made of a resin material and has an inner annular groove 1d while being formed thicker than in the case where the cover 1 is made of an iron material.

  Accordingly, even if the cover 1 is plated with chrome, for example, in the present invention, the cover 1 is not press-fitted, which is advantageous in that it does not cause a problem that the chrome plating breaks.

  Even in the outer tube 2, it is essential to form the outer annular groove 2e facing the inner annular groove 1d on the cover 1 side on the outer peripheral side portion of the small diameter portion 2b in the upper end portion 2a. The outer annular groove 2e is assumed to have the same groove width as the opposing inner annular groove 1d in the drawing, and when the cover 1 is connected to the outer tube 2 using the snap ring 4, the outer tube 2 and the cover 1 Consideration is given to avoid vertical play between the two.

  On the other hand, the cover 1 is formed so as to converge the upper end portion 1c as the distal end portion with respect to the lower end portion 1a as the base end portion. At this time, the outer diameter of the lower end portion 1a is set to the outer tube. 2 is made to coincide with the outer diameter of the upper end portion 2a and gradually reduces the outer diameter as it goes upward to eliminate the uncomfortable feeling, and the inner periphery of the rounded upper end portion 1c is annular with respect to the outer periphery of the inner tube 3. Opposite with a gap S.

  Incidentally, the annular gap S appearing between the inner periphery of the upper end 1 c of the cover 1 and the outer periphery of the inner tube 3 generates mischievous sliding resistance when the inner tube 3 protrudes and retracts with respect to the outer tube 2. It is provided in order not to let it.

  Further, the lower end portion 1a of the cover 1 is connected to the small diameter portion 2b in the upper end portion 2a of the outer tube 2, and in the illustrated case, the small diameter portion 2b is inserted into the inner periphery of the lower end portion 1a, At this time, the lower end 1b of the cover 1 is brought into contact with the stepped portion 2c serving as a boundary portion between the upper end portion 2a and the small-diameter portion 2b so as not to cause a mischievous gap to appear.

  By the way, in the present invention, as described above, when the cover 1 is attached to the outer tube 2, unlike the above-described conventional example shown in FIG. Use ring 4.

  At this time, the snap ring 4 according to the present invention is formed by bending with a metal wire having an appropriate bending rigidity such as a piano wire, as is the case with a snap ring of almost all kinds, and as shown in FIG. At the time of so-called mounting, both end portions 4a, which are formed of separated end portions and are used as external force input portions, are exposed to the upper end portion 2a of the outer tube 2.

  Incidentally, this snap ring 4 is partly fitted in an inner annular groove 1d formed on the inner peripheral side portion of the lower end portion 1a of the cover 1, and the outer peripheral side portion of the small diameter portion 2b in the upper end portion 2a of the outer tube 2. The cover 1 and the outer tube 2 are securely connected to each other by partially fitting the outer annular groove 2e.

  That is, as shown in FIG. 2A, the snap ring 4 is basically formed in a substantially C-ring shape while having both end portions 4a which are separated end portions and are used as external force input portions. And a main body (not shown) having an energizing force in the diameter expanding direction.

  Therefore, in the snap ring 4, when the external force is input so as to sandwich the both ends 4a serving as the external force input portions by using, for example, pliers, the external force input to the both ends 4a is reduced. When it is resolved, the diameter is expanded so that it can be restored.

  On the other hand, in the snap ring 4, as shown in FIG. 2A, the main body portion is fitted into the inner annular groove 1d formed in the cover 1 when the diameter is expanded, but the inner ring groove 1d is formed when the diameter is reduced. The diameter-reduced part 4b that fits into the outer annular groove 2e formed on the outer tube 2 side when the diameter of the main body is reduced and expanded is provided in the circumferential direction at an arbitrary position in the circumferential direction. It is provided between the enlarged diameter portions 4b.

  That is, when it demonstrates based on the place shown to FIG. 2 (A), while leaving the curved part which becomes the up-and-down side in FIG. 2 (A) in the main-body part and the curved part which becomes the left side as the enlarged diameter part 4b, The reduced diameter portion 4c is formed by bending the curved portion inward.

  In the snap ring 4, both end portions 4 a made up of separation ends are provided on the right side in FIG. 2, and both end portions 4 a are used as external force input portions, and both end portions are input by external force input. By narrowing the interval 4a, the main body can be reduced in diameter, and with this, it is assumed that the snap ring 4 is formed so that it can be disconnected.

  In the snap ring 4, the enlarged diameter portion 4b of the main body portion is fitted into the inner annular groove 1d formed on the inner peripheral side portion of the lower end portion 1a of the cover 1, and the main body described above. The diameter-reduced portion 4c in the portion is fitted into the outer annular groove 2e formed on the outer peripheral side portion of the small-diameter portion 2b in the upper end portion 2a of the outer tube 2.

  From the above, when the snap ring 4 is formed, that is, when the main body portion is formed, the above-mentioned enlarged diameter portion 4b and reduced diameter portion 4c are bent as well as both end portions 4a. Is good.

  By the way, in the snap ring 4 according to the present invention, both end portions 4a, which are composed of separated end portions and are used as external force input portions, are, as shown in FIG. The outer tube 2 (see FIG. 1), which is substantially perpendicular to the direction and is in the vertical direction in the figure, is bent obliquely downward along the axial direction of the outer tube 2 (see FIG. 1).

  Incidentally, the both end portions 4a may be formed so as to be bent at a right angle so as to be downward while orthogonal to the axial direction of the main body portion, although not shown, instead of the above-described portions.

  Further, regarding the diameter reduction in the snap ring 4, various configurations can be selected. However, in consideration of the actual use of the snap ring 4, a configuration having a complicated configuration is not preferable. .

  In other words, the cover 1 covers the protruding portion 3a of the inner tube 3 from the outer tube 2, thereby avoiding muddy water from adhering to the protruding portion 3a or hitting the protruding portion 3a accidentally. To avoid that.

  In view of this, it is not preferable to provide a complicated structure in a portion where the attachment of muddy water or the collision of stepping stones is a concern, and the structure is simple, that is, the separation end portion of the snap ring 4 of the present invention. It is good to form in a simple shape like the both ends 4a.

  Further, in the snap ring 4, the both end portions 4 a described above are externally visible as shown in FIG. 3 when the cover 1 is held on the upper end portion 2 a of the outer tube 2 by using the snap ring 4. It is exposed to the upper end 2a of the outer tube 2 and particularly to the notch recess 2d formed in the upper end 2a.

  Incidentally, at this time, the lower end 1a of the cover 1 has an opening 1f facing the above-described notch recess 2d, and allows the movement of the snap ring 4 so that both end portions 4a approach each other.

  In contrast to the above, although not shown, in the case of the snap ring 4, when both end portions 4a protrude horizontally in a state along the axial direction of the main body portion, the outer tube 2 protrudes to the outside. Thus, it can be said that there is a possibility that mud is easily attached to both end portions 4a, or that both end portions 4a are liable to touch the rider's body and clothes.

  From this, in the present invention, since both ends 4a of the snap ring 4 are set to be accommodated in the notch recess 2d formed in the upper end 2a of the outer tube 2, the above-described problems can be avoided. Is advantageous.

  In the case where both ends 4a are set to be accommodated in a notch recess 2d formed in the upper end 2a of the outer tube 2, the outer periphery of both ends 4a does not protrude outward from the outer periphery of the upper end 2a of the outer tube 2. However, it does not exclude the fact that the protrusion does not become a hindrance.

  In order to reduce the diameter of the snap ring 4, it is sufficient to sandwich both end portions 4a existing in the notch recess 2d from both sides with, for example, pliers. At this time, in order to improve operability, the notch recess 2d In addition, it is preferable to have a gap (not shown) outside the both ends 4a so that the tip can be inserted into the pliers.

  At that time, as shown by a broken line diagram in FIG. 3, both end portions 4 a may be deformed so as to have a C shape in a front view, and the operability at the time of reducing the diameter of the snap ring 4 may be improved. good.

  In the present invention, since the snap ring 4 is formed as described above, when the cover 1 is held by the outer tube 2, first, the outer annular groove 2 e formed in the small diameter portion 2 b of the outer tube 2 is formed. The diameter of the positioned snap ring 4 is reduced.

  Then, from the state in which the diameter of the snap ring 4 is reduced, the cover 1 is lowered so that the inner tube 3 is conducted into the cover 1, and the lower end portion 1 a of the cover 1 is reduced in diameter at the upper end portion 2 a of the outer tube 2. It is made to oppose part 2b.

  At this time, the inner annular groove 1d formed in the lower end portion 1a of the cover 1 is in a posture to face the outer periphery of the snap ring 4 positioned in the outer annular groove 2e formed in the narrow diameter portion 2b of the outer tube 2. In this state, the diameter of the snap ring 4 is increased, and the lower end 1b of the cover 1 is brought into contact with the stepped portion 2c of the outer tube 2.

  As a result, in the snap ring 4, the reduced diameter portion 4c is fitted in the outer annular groove 2e on the outer tube 2 side, and the enlarged diameter portion 4b is fitted in the inner annular groove 1d on the cover 1 side. The connection of the cover 1 to the outer tube 2, that is, the attachment of the cover 1 to the outer tube 2 is realized.

  On the other hand, when removing the cover 1 held by the outer tube 2, first, the snap ring 4 is reduced in diameter by applying an external force to both end portions 4 a of the snap ring 4.

  As a result, in the snap ring 4, the enlarged diameter portion 4 b comes out of the inner annular groove 1 d of the cover 1 so as to come out, and the connection state with respect to the outer tube 2 is canceled. The cover 1 can be removed from the outer tube 2 when the diameter is reduced.

  At this time, since a mischievous external force is not applied to the cover 1, the cover 1 can be reused without being unnecessarily damaged.

  Since the cover 1 can be reused, for example, it is possible to respond to a request when the rider is involved in the cover 1 being used, and from the viewpoint of enabling the replacement of the cover 1, the cover 1 can be used. There is also an advantage of enabling the use of one replacement.

  By the way, in this invention, since the cover 1 is located at the upper end and a gap S (see FIG. 1) appears between the cover 1 and the inner tube 3, the outer periphery of the inner tube 3 protruding upward from the cover 1. For example, a situation in which rainwater attached to the inside of the inner tube 3 enters the cover 1 through the outer periphery of the inner tube 3 is expected.

  Therefore, in order to quickly drain the rainwater that has entered the inside of the cover 1 to the outside, in the present invention, the notch recess 2d that accommodates both ends 4a of the snap ring 4 described above, that is, the outer tube 2 A notch recess 2d formed in the upper end 2a is used.

  At this time, the cover 1 has a drain passage 1e (see FIG. 1) formed of a vertical groove for facilitating the drainage of rainwater collected above the upper end 2a of the outer tube 2 into the notch recess 2d. The lower end of the drain passage 1e opens into the notch recess 2d through the opening 1f.

  Therefore, when the rainwater that has entered the inside of the cover 1 along the outer periphery of the inner tube 3 accumulates above the upper end portion 2a of the outer tube 2, the drain passage 1e, the opening 1f, and the notch recess described above. It passes through 2d and is discharged to the outside.

  As described above, in the cover mounting structure according to the present invention, the snap ring 4 is used as a part for holding the cover 1 on the outer tube 2, but the use of other parts is not required. Compared with the proposal disclosed in Patent Document 1, the number of parts is reduced, the productivity is improved, and the cost is advantageous.

  In the cover mounting structure according to the present invention, the diameters of the both ends 4a, which are the separated ends of the snap ring 4, are reduced by narrowing the distance using a tool such as pliers, that is, the snap ring. 4 is formed so as to be able to release the connection, so that the snap ring 4 can be easily detached from the inner annular groove 1d on the cover 1 side, and can be removed from the outer tube 2 without damaging the cover 1. Become.

  From this point of view, it can be said that there is a disadvantage in that the snap ring 4 is required as compared with the conventional cover mounting structure shown in FIG. 4, but the cover 1 can be reused. It will be advantageous.

  In particular, in the cover mounting structure according to the present invention, the cover 1 can be removed without damaging it and the cover 1 can be reused. Therefore, the cover mounting structure according to the conventional example shown in FIG. Thus, there is an advantage that there is a degree of freedom in selecting a material for forming the cover 1 and that it can meet various demands in a motorcycle rider who often has a high hobby.

  As described above, the cover 1 is made of a resin material and has the inner annular groove 1d into which the snap ring 4 is fitted. However, as long as the snap ring 4 can be used, the cover 1 is illustrated instead. However, for example, an inner annular groove member made of, for example, a resin material may be fixed to the inner periphery of the lower end while the cover is made of an iron plate, and the snap ring may be fitted into the inner annular groove of the inner annular groove member. good.

  In the above description, the snap ring 4 is made of a piano wire having an appropriate bending rigidity, that is, a metal material. From the viewpoint of embodying the present invention, when the cover 1 is removed from the outer tube 2. As long as the cover 1 is not damaged, it can be said that the snap ring 4 may be broken, so the snap ring 4 may also be made of a resin material. In addition, it is advantageous in that it is possible to avoid the inconvenience that the snap ring rusts and cannot be reduced in diameter.

  Further, in the above description, the cover 1 is attached to the upper end 2a of the outer tube 2 so as to be placed from above in a front fork set upright, but the cover attachment structure of the present invention is intended. However, instead of this, although not shown, the inverted front fork may be attached in a state of being suspended from the lower end portion of the outer tube, and in this case, both end portions of the snap ring are accommodated. It can be said that it is advantageous in that it is sufficient to form a so-called recess in the cover without forming it in the outer tube.

  Furthermore, in the above description, the both end portions 4a formed by the separation end portions as the external force input portions in the snap ring 4 are bent in the axial direction of the outer tube 2. It can be said that the both ends 4a may protrude in the radial direction of the outer tube 2 depending on the state of being mounted on the vehicle.

  In particular, when a pair of front forks are disposed so that both end portions 4a of the snap ring 4 are opposed to each other, that is, when mounted on a two-wheeled vehicle, the both end portions 4a of the snap ring 4 are the riders. Since there is almost no possibility of interfering with the body or clothes, it can be said that both end portions 4a may protrude in the radial direction of the outer tube 2.

  In such a case, rather, it can be said that it is advantageous that the both end portions 4a protrude in the radial direction of the outer tube 2 from the viewpoint of facilitating the external force input operation to the both end portions 4a. .

  Suitable for the realization of a front fork that is a hydraulic shock absorber that is mounted on the front wheel side of a motorcycle and absorbs road surface vibrations input to the front wheel while suspending the front wheel of the motorcycle. Suitable for use when enabling use.

DESCRIPTION OF SYMBOLS 1 Cover 1a Lower end part 1b Lower end 1c, 2a Upper end part 1d Inner annular groove 1e Drain passage 2 Outer tube 2b Small diameter part 2c Step part 2d Notch recessed part 2e Outer annular groove 3 Inner tube 3a Protruding part 4 Snap ring 4a Both end part 4b Expansion Diameter 4c Reduced diameter 5 Dust seal S Annular gap

Claims (4)

The inner tube is inserted into the outer tube so that it can protrude and retract, and the cylindrical cover that covers the protruding part of the inner tube that protrudes from the outer tube is separated into the outer tube under the provision of a snap ring that can be disconnected. In the cover mounting structure that can be mounted ,
An outer annular groove is formed on the outer peripheral side of the outer tube,
Forming an inner annular groove facing the outer annular groove on the inner peripheral side of the cover;
The snap ring has a main body portion that is bent in a C shape, and both end portions that are formed at the end portions of the main body portion and serve as input portions for external force,
While the main body portion is reduced in diameter when an external force is applied to both ends, the diameter is increased when the external force is applied to both ends, while the enlarged diameter portion that fits in the inner annular groove is expanded in the circumferential direction. In addition, a reduced diameter portion that fits into the outer annular groove when the main body portion is reduced in diameter is provided between the enlarged diameter portions so that the cover and the outer tube A cover mounting structure characterized by enabling connection and separating the cover from the outer tube when the diameter is reduced . The outer tube holds an inner end holding a seal that slides the inner periphery to the outer periphery of the inner tube, a small diameter portion continuous to the upper end portion, and a step that is a boundary between the small diameter portion and the upper end portion. And the lower end of the cover is inserted into the outer periphery of the small-diameter portion of the outer tube and the snap ring is fitted into the inner annular groove formed on the inner peripheral side of the lower end, the lower end of the cover is The cover mounting structure according to claim 1, wherein the cover mounting structure is in contact with the stepped portion . The outer tube has a notch recess at the upper end, and this notch recess accommodates both ends of the snap ring while opening the upper end into a stepped portion that allows contact with the lower end of the cover. The cover mounting structure according to claim 1 or 2 . The cover has a drain passage formed of a vertical groove on the inner peripheral side portion of the lower end portion inserted into the narrow diameter portion at the upper end portion of the outer tube, and enables discharge of foreign matter entering the inside of the cover to the outside. Item 4. The cover mounting structure according to item 1, 2 or 3 .

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