JP2011074996A - Cylinder device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder device meeting a plurality of specifications while suppressing the manufacturing cost of a protective cover. <P>SOLUTION: The cylinder device includes a cylinder 12 and a rod 13 telescopically extending from the cylinder 12 and the protective cover 14 for covering the rod 13 and the cylinder 12 is attached to the rod 13. The protective cover 14 is formed of resin material and includes: a first protective cover body 30 covering the rod 13 and the cylinder 12 and having a first engagement portion 47 at the end; and a second protective cover body 31 having at the end a second engagement portion 62 for engaging with the first engagement portion 47. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cylinder device.

  2. Description of the Related Art Some cylinder devices including a cylinder and a rod extending from the cylinder have a rod and a protective cover covering the rod for the purpose of protecting the cylinder. In this type of cylinder device, there is one in which the protective cover is configured by a combination of a metal member and a rubber member (see, for example, Patent Document 1).

  By the way, in the cylinder device, the stroke of the rod may be different depending on the specification, or the length of the cylinder may be different. However, if a dedicated protective cover is provided for each specification, the cost increases. Become. For this reason, for example, there is a technique in which a protective cover having a long length is prepared and the protective cover is cut according to the length of the cylinder (see, for example, Non-Patent Document 1).

Japanese Utility Model Publication No. 54-12487

Japan Society for Invention and Innovation Open Technical Bulletin No. 2005-501021

  As described above, if the protective cover is cut according to the specifications, a part that becomes unnecessary and is discarded is generated, which increases the manufacturing cost.

  Therefore, an object of the present invention is to provide a cylinder device that can cope with a plurality of specifications while suppressing the manufacturing cost of the protective cover.

  In order to achieve the above object, according to the present invention, a protective cover is formed of a resin material, covers a rod and a cylinder, has a first engaging portion at one end, and the first protective cover body. The second protective cover body has a second engaging portion that engages with one engaging portion at one end.

  In the present invention, the protective cover is formed of a resin material, covers the rod and the cylinder, has a first engaging portion at one end, and the first engaging portion. A second protective cover body having a second engaging portion to be engaged at one end portion and a third engaging portion at the other end portion, and a fourth relationship engaging with the third engaging portion. It consists of the 3rd protective cover body which has a joint part in one end part.

  According to the present invention, the manufacturing cost of the protective cover can be suppressed.

It is the front view which made the section which shows a cylinder device concerning a 1st embodiment of the present invention a section. It is a fragmentary sectional view which shows the base protective cover body of the protective cover of the cylinder apparatus which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view which shows the connection protection cover body of the protection cover of the cylinder apparatus which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view which shows the assembly example of the protective cover of the cylinder apparatus which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view which shows another assembly example of the protective cover of the cylinder apparatus which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view which shows the connection protection cover body of the protection cover of the cylinder apparatus which concerns on 2nd Embodiment of this invention. It is a fragmentary sectional view which shows the assembly example of the protective cover of the cylinder apparatus which concerns on 2nd Embodiment of this invention. It is a fragmentary sectional view which shows another assembly example of the protective cover of the cylinder apparatus which concerns on 2nd Embodiment of this invention. It is a fragmentary sectional view which shows the connection protection cover body of the protection cover of the cylinder apparatus which concerns on 3rd Embodiment of this invention. It is a fragmentary sectional view which shows the assembly example of the protective cover of the cylinder apparatus which concerns on 3rd Embodiment of this invention.

“First Embodiment”
A cylinder device according to a first embodiment of the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, a cylinder device 11 according to the first embodiment includes a substantially cylindrical cylinder 12 in which hydraulic fluid, which is a fluid, is sealed, and a cylinder 12 disposed on the central axis of the cylinder 12. A rod 13 extending from an opening (not shown) at one end so as to extend and contract outside, and a covered cylindrical protective cover that is attached to an external projecting portion of the rod 13 and covers the opening side of the rod 13 and the cylinder 12 14. A piston 15 is fixed to one end of the rod 13 in the cylinder 12. The piston 15 divides the cylinder 12 into two chambers and slides inside the cylinder 12 to change the volume of the two chambers. Damping force is generated by the flow resistance of the fluid generated at the time. Specifically, the cylinder device 11 is a shock absorber that constitutes a suspension device for a vehicle.

  On the projecting distal end side of the rod 13, a covered cylindrical cap 19 having a perforated disk-shaped lid portion 17 and a cylindrical portion 18 extending from the outer peripheral portion of the lid portion 17 to the axial direction side, The cylindrical portion 18 is fixed at the center of the lid portion 17 with the cylinder portion 18 disposed on the cylinder 12 side.

  On the opposite side of the cap portion 19 of the cap portion 19 from the cap portion 19, a substantially cylindrical mounting eye 21 is integrally fixed by welding so that its axis is perpendicular to the rod 13. A rubber bush 22 is press-fitted inside the mounting eye 21. A substantially cylindrical mounting eye 23 is also integrally fixed to the cylinder 12 on the side opposite to the rod 13 by welding so that its axis is perpendicular to the cylinder 12. A rubber bush 24 is press-fitted. The cylinder device 11 dampens the stroke of the wheel with respect to the vehicle body by attaching the mounting eye 21 on the rod 13 side to the vehicle body side via the rubber bushing 22 and the mounting eye 23 on the cylinder 12 side to the wheel side via the rubber bushing 24. Let

  The protective cover 14 is attached to the rod 13 via the cap 19 and covers a base protective cover body (first protective cover body) 30 that covers the rod 13 and the cylinder 12, and a connected protective cover connected to the base protective cover body 30. And a body (second protective cover body, third protective cover body) 31.

  The base protective cover body 30 is integrally formed of a resin material. As shown in FIG. 2, the base protective cover body 30 includes a perforated disc-shaped top plate portion 36 with a through hole 35 formed in the center, and an axis of the top plate portion 36 from the outer peripheral edge of the top plate portion 36. A cylindrical fitting cylindrical part 37 extending to one side in the direction, and an annular contact plate part slightly projecting radially inward from the end opposite to the top plate part 36 of the fitting cylindrical part 37 38, and an intermediate taper cylindrical portion 39 extending from the inner peripheral edge portion of the contact plate portion 38 along the axial direction of the contact plate portion 38 so as to gradually expand the diameter to the opposite side of the fitting cylindrical portion 37, have.

  Further, the base protective cover body 30 extends from the end of the intermediate taper cylindrical portion 39 opposite to the contact plate 38 to the side opposite to the contact plate 38 along the axial direction of the intermediate taper cylindrical portion 39. A cylindrical intermediate cylindrical portion 40 to be extended, and an engagement extending from the end of the intermediate cylindrical portion 40 on the side opposite to the intermediate tapered cylindrical portion 39 so as to gradually expand the diameter opposite to the intermediate tapered cylindrical portion 39. A tapered tubular portion 41, an annular engaging step portion 42 that slightly protrudes radially inward from the end of the engaging tapered tubular portion 41 opposite to the intermediate cylindrical portion 40, and an inner portion of the engaging step portion 42 A cylindrical engagement cylindrical portion 43 that extends from the peripheral portion along the axial direction of the engagement step portion 42 to the opposite side of the engagement tapered tube portion 41 is provided.

  The top plate portion 36, the fitting cylindrical portion 37, the abutting plate portion 38, the intermediate tapered cylindrical portion 39, the intermediate cylindrical portion 40, the engaging tapered cylindrical portion 41, the engaging stepped portion 42, and the engaging cylindrical portion described above. 43 is formed coaxially. The intermediate cylindrical portion 40 and the engaging cylindrical portion 43 are formed to have the same outer diameter and the same inner diameter.

  The base protective cover body 30 is placed on the mounting eye 21 side of the cylinder 12 shown in FIG. 1 with the engaging cylindrical portion 43 side as a tip. At this time, the mounting eye 21 is attached to the top plate portion 36 in the through hole 35. Then, the cylindrical portion 18 of the cap 19 is fitted inside the fitting cylindrical portion 37 to be attached to the cap 19. At this time, the base protective cover body 30 abuts on the lid portion 17 of the cap 19 at the top plate portion 36, and abuts on the edge portion of the abutting plate portion 38 opposite to the lid portion 17 of the cylindrical portion 18. Thus, the axial movement with respect to the cap 19 is restricted. That is, in the base protection cover body 30, the top plate portion 36, the fitting cylindrical portion 37, and the contact plate portion 38 constitute an attachment portion 45 that is attached to the rod 13 via the cap 19.

  As shown in FIG. 2, the base protective cover body 30 includes an engagement taper cylinder portion 41 and an engagement step portion 42 that are formed at one end portion in the axial direction and are recessed radially outward. An engaging recess (first engaging portion) 47 for engaging is formed. The engaging recess 47 is formed over the entire circumference of the base protective cover body 30, and forms the engaging recess 47 and protrudes radially outward to form a rib-shaped tapered cylindrical portion 41 and an engaging step portion 42. Is also formed over the entire circumference of the base protective cover body 30.

  In the first embodiment, as shown in FIGS. 2 (a) to 2 (c), a plurality of types of base protective cover bodies 30 (A) that differ only in the axial length of the intermediate cylindrical portion 40, specifically, three types. ) To 30 (C) are prepared, and one selected from these is used. That is, the base protective cover body 30 (A) has an intermediate cylindrical portion 40 (A) with a short axial length, so that the overall length is shortened, and the base protective cover body 30 (B) has an intermediate axial length. By having the intermediate cylindrical portion 40 (B) longer than the cylindrical portion 40 (A), the overall length is made longer than that of the base protective cover body 30 (A). Further, the base protective cover body 30 (C) has an intermediate cylindrical portion 40 (C) whose axial length is longer than that of the intermediate cylindrical portion 40 (B), so that the overall length is longer than that of the base protective cover body 30 (B). Has been.

  The connection protection cover body 31 shown in FIG. 3 is also integrally formed of a resin material. The connection protection cover body 31 includes a cylindrical engagement cylindrical portion 50 and an engagement tapered tube extending so as to gradually increase in diameter from one end in the axial direction of the engagement cylindrical portion 50 to one side in the axial direction. Part 51, an annular engagement step part 52 slightly projecting radially inward from the end of engagement taper cylinder part 51 opposite to engagement cylinder part 50, and the inner peripheral edge of engagement step part 52 And a cylindrical engaging cylindrical portion 53 extending from the portion to the opposite side of the engaging tapered cylindrical portion 51 along the axial direction of the engaging stepped portion 52.

  Further, the connection protection cover body 31 includes an annular step portion 54 slightly protruding radially outward from an end portion of the engagement cylindrical portion 53 opposite to the engagement step portion 52, and an outer peripheral edge of the step portion 54. A cylindrical intermediate cylindrical portion 55 extending from the portion along the axial direction of the stepped portion 54 to the opposite side of the engaging cylindrical portion 53, and a stepped portion from the end opposite to the stepped portion 54 of the intermediate cylindrical portion 55. An engagement taper cylinder 56 extending so as to gradually expand the diameter to the opposite side of the part 54, and slightly inward in the radial direction from the end of the engagement taper cylinder 56 opposite to the intermediate cylinder 55 A protruding annular engagement step portion 57, and a cylindrical shape extending from the inner peripheral edge of the engagement step portion 57 to the opposite side of the engagement tapered tube portion 56 along the axial direction of the engagement step portion 57. And an engaging cylindrical portion 58.

  In addition, as mentioned above, the engagement cylinder part 50, the engagement taper cylinder part 51, the engagement step part 52, the engagement cylinder part 53, the step part 54, the intermediate cylinder part 55, the engagement taper cylinder part 56, the engagement step part 57 and the engagement cylindrical portion 58 are formed coaxially. Further, the engaging cylindrical portion 50 and the engaging cylindrical portion 53 are formed to have the same outer diameter and inner diameter, and the intermediate cylindrical portion 55 has a larger outer diameter and inner diameter than the engaging cylindrical portion 53. Is formed. In addition, the intermediate cylindrical portion 55 and the engaging cylindrical portion 58 have the same outer diameter and the same inner diameter, and both the intermediate cylindrical portion 40 and the engaging cylindrical portion 43 of the base protective cover body 30 have the same outer diameter and the same inner diameter. Is formed.

  The connection protection cover body 31 has an engagement taper cylinder portion 51 and an engagement step portion 52 formed at one end portion in the axial direction, and the engagement recess portion 47 of the base protection cover body 30 and other connection protection covers. An engagement claw portion (second engagement portion, fourth engagement portion) 62 projecting radially outward that can be engaged with an engagement recess (third engagement portion) 63 described later of the body 31 is provided. It is composed. In addition, the diameter of the engagement tapered tube portion 56 and the engagement step portion 57 formed at the other end portion in the axial direction of the connection protection cover body 31 engages the engagement claw portion 62 of the other connection protection cover body 31. An engaging recess 63 that is recessed outward is formed.

  Here, the engagement claw portion 62 including the engagement tapered tube portion 51 and the engagement step portion 52 that protrude radially outward and form a rib shape is formed over the entire circumference of the connection protection cover body 31. Similarly, an engagement recess 63 that is recessed radially outward is also formed over the entire circumference of the connection protection cover body 31, and the engagement tapered cylinder portion 56 and the engagement step portion 57 that form the engagement recess 63 are also radially outward. Is formed over the entire circumference of the connection protection cover body 31.

  In the first embodiment, as shown in FIG. 3A to FIG. 3C, a plurality of types, specifically three types of connection protection cover bodies 31 (A) that differ only in the axial length of the intermediate cylindrical portion 55. ) To 31 (C) are prepared, and one or more selected from these are used. That is, the total length of the connection protection cover body 31 (A) is shortened by having the intermediate cylindrical portion 55 (A) having a short axial length, and the connection protection cover body 31 (B) has a medium axial length. By having the intermediate cylindrical part 55 (B) that is longer than the cylindrical part 55 (A), the total length is made longer than the connection protection cover body 31 (A). Further, the connection protection cover body 31 (C) has an intermediate cylindrical portion 55 (C) whose axial length is longer than that of the intermediate cylinder portion 55 (B), so that the overall length is longer than that of the connection protection cover body 31 (B). Has been.

  As shown in FIG. 4, the connection protection cover body 31 is engaged with the inner periphery of the engagement recess 47 of the base protection cover body 30 at the outer periphery of the engagement claw 62. At that time, the connection protective cover body 31 is fitted to the inner peripheral portion of the intermediate cylindrical portion 40 with the outer peripheral portion of the engaging cylindrical portion 50 and the inner peripheral portion of the engaging tapered cylindrical portion 41 with respect to the base protective cover body 30. And the engagement step portion 42 is brought into contact with the engagement step portion 42, and the outer periphery portion of the engagement cylinder portion 53 is attached to the inner periphery portion of the engagement cylinder portion 43. Fit. Of these, the engagement claw portion 62 composed of the engagement taper tube portion 51 and the engagement step portion 52 is fitted into the engagement recess portion 47 composed of the engagement taper tube portion 41 and the engagement step portion 42, thereby protecting the base. The cover body 30 and the connection protection cover body 31 are connected so as not to move relative to each other in the axial direction and the radial direction. Here, the axial length of the engagement cylindrical portion 53 is equal to the axial length of the engagement step portion 42 and the engagement cylindrical portion 43 combined, and the base protective cover body 30 is engaged when engaged. It is set so that there is no gap in the axial direction between the cylindrical portion 43 and the step portion 54 of the connection protection cover body 31.

  Further, as shown in FIG. 5, the connection protection cover body 31 (see the connection protection cover body 31 (B)) is connected to the other connection protection cover body 31 (connection protection cover body 31) at the outer peripheral portion of the engaging claw 62. It is also possible to engage with the inner peripheral portion of the engaging recess 63 (see (A)). At that time, one connection protection cover body 31 is engaged with the outer peripheral portion of the engagement cylindrical portion 50 to the inner peripheral portion of the intermediate cylindrical portion 55 with respect to the other connection protection cover body 31, and the engagement taper cylindrical portion 56. The outer peripheral part of the engagement tapered cylinder part 51 is fitted to the inner peripheral part of the engagement cylinder part 51, the engagement step part 52 is brought into contact with the engagement step part 57, and the engagement cylindrical part 53 is connected to the inner peripheral part of the engagement cylindrical part 58. The outer periphery of each is fitted. Among these, the engagement claw part 62 consisting of the engagement taper cylinder part 51 and the engagement step part 52 is engaged with the engagement recess part 63 consisting of the engagement taper cylinder part 56 and the engagement step part 57, thereby protecting the connection. The cover body 31 and the connection protection cover body 31 are connected so as not to be relatively movable in the axial direction and the radial direction. Here, the axial length of the engagement cylindrical portion 53 is equal to the axial length of the engagement step portion 57 and the engagement cylindrical portion 58, and the other connection protection cover body 31 is engaged when engaged. It is set so that there is no gap in the axial direction between the engagement cylindrical portion 58 and the engagement step portion 54 of one of the connection protection cover bodies 31.

  By using one of the plurality of base protection cover bodies 30 (A) to 30 (C) described above and at least one of the plurality of connection protection cover bodies 31 (A) to 31 (C) in combination. A plurality of protective covers 14 having different overall lengths can be produced.

  For example, as shown in FIG. 4, the protective cover 14 is produced by combining the base protective cover body 30 (C) and the connection protective cover body 31 (A), or as shown in FIG. 5, the base protective cover body 30. The protective cover 14 having various overall lengths can be produced by producing the protective cover 14 by combining (A), the connected protective cover body 31 (A), and the connected protective cover body 31 (B). . Of course, when a plurality of connection protection cover bodies 31 (A) to 31 (C) are used, a plurality of connection protection cover bodies 31 (A) to 31 (C) having the same axial length may be connected.

  According to the cylinder device 11 according to the first embodiment described above, the protective cover 14 is formed of a resin material, and covers the rod 13 and the cylinder 12 and has an engaging recess 47 at one end. 30 and a connection protection cover body 31 having an engagement claw portion 62 that engages with the engagement recess 47 at one end thereof, the connection protection cover body 31 is connected to the base protection cover body 30 and the protection cover 14 is connected. can do. Therefore, if at least one of the base protective cover body 30 and the connection protective cover body 31 is prepared with a different total length, the stroke of the rod 13 is different or the cylinder 12 is not cut and discarded. The protective cover 14 having an appropriate full length can be attached to the cylinder device 11 having a plurality of specifications having different lengths. Therefore, the manufacturing cost of the protective cover 14 can be suppressed.

  In addition, the connection protection cover body 31 has an engagement claw portion 62 that engages with the engagement recess 47 of the base protection cover body 30 at one end, and an engagement claw of another base protection cover body 30 on the other end side. Since it has the engagement recessed part 63 with which the part 62 is engaged, the base protection cover body 30 and the some connection protection cover body 31 can also be connected, and it can also be set as the protection cover 14. FIG. Therefore, it is possible to attach the protective cover 14 having an appropriate full length while suppressing the manufacturing cost to the cylinder device 11 having various specifications in which the stroke of the rod 13 is different or the length of the cylinder 12 is different.

  In addition, regardless of the stroke of the rod 13 and the length of the cylinder 12, a plurality of types of base protective cover bodies 30 having different axial lengths and a plurality of types of connecting protective cover bodies 31 having different axial lengths are prepared. By combining any one of the base protective cover bodies 30 and one or more connected protective cover bodies 31, the protective cover 14 having an appropriate axial length can be attached to the cylinder device 11 having various specifications. . Therefore, various types of protective covers 14 having different axial lengths can be produced without increasing the number of manufacturing dies.

  Moreover, since the outer peripheral part of the engaging claw part 62 of the connection protective cover body 31 is engaged with the inner peripheral part of the engaging concave part 47 of the base protective cover body 30, it is possible to effectively prevent intrusion of foreign matters and the like from the outside. .

  In addition, the rib-like engagement taper cylindrical portion 41 and the engagement step portion 42 that form the engagement concave portion 47 and project toward the outer peripheral side are formed over the entire circumference of the base protective cover body 30. The cylinder part 41 and the engagement step part 42 can increase the rigidity of the base protective cover body 30. Therefore, it can prevent that the protective cover 14 contacts the cylinder 12 at the time of expansion / contraction of the cylinder apparatus 11.

  Similarly, the engaging claw portion 62 that protrudes to the outer peripheral side, and the engaging taper cylindrical portion 56 and the engaging step portion 57 that form the engaging concave portion 63 are each formed in a rib shape over the entire circumference of the connection protection cover body 31. Therefore, the rigidity of the connection protection cover body 31 can be increased by the engagement claw portion 62, the engagement tapered cylindrical portion 56 and the engagement step portion 57 that form the engagement recess 63. Therefore, it can prevent that the protective cover 14 contacts the cylinder 12 at the time of expansion / contraction of the cylinder apparatus 11.

“Second Embodiment”
Next, a cylinder device according to a second embodiment of the present invention will be described mainly with reference to FIGS. 6 to 8 focusing on differences from the first embodiment. Portions common to the first embodiment have the same names and the same symbols.

  In 2nd Embodiment, it has the connection protection cover body 70 which changed the partial structure of the connection protection cover body 31. As shown in FIG. The connection protection cover body 70 is also integrally formed of a resin material. As shown in FIG. 6, the engagement cylindrical portion 50, the engagement taper cylinder portion 51, and the engagement step portion 52 are the same as the connection protection cover body 31. And an engaging cylindrical portion 53. That is, the connection protection cover body 70 also has the same engaging claw portion 62 as the connection protection cover body 31.

  The connection protection cover body 70 is an intermediate taper that extends from the end of the engagement cylindrical portion 53 opposite to the engagement step portion 52 so as to gradually increase in diameter toward the opposite side of the engagement step portion 52. Part 71 and a cylindrical large-diameter cylindrical part 72 extending from the end of the intermediate taper part 71 opposite to the engaging cylindrical part 53 to the opposite side of the engaging cylindrical part 53.

  Also in this connection protection cover body 70, the engaging cylindrical portion 50, the engaging tapered cylindrical portion 51, the engaging stepped portion 52, the engaging cylindrical portion 53, the intermediate tapered portion 71 and the large diameter cylindrical portion 72 are formed coaxially. Has been. The large diameter cylindrical portion 72 is larger in diameter than the engagement cylindrical portion 50 and the engagement cylindrical portion 53 and larger in diameter than the engagement claw portion 62, and is larger than the maximum outer diameter of the base protective cover body 30. Has a large outer diameter and inner diameter.

  In 2nd Embodiment, as shown to Fig.6 (a)-FIG.6 (c), several types from which only the axial direction length of the large diameter cylindrical part 72 differs, specifically, three types of connection protection cover bodies 70 ( A) to 70 (C) are prepared, and one selected from these is used. That is, the entire length of the connection protection cover body 70 (A) is shortened by having the large-diameter cylindrical portion 72 (A) having a short axial length, and the connection protection cover body 70 (B) has an axial length. By having the large-diameter cylindrical portion 72 (B) longer than the large-diameter cylindrical portion 72 (A), the overall length is made longer than the connection protection cover body 70 (A). Further, the connection protection cover body 70 (C) has a large-diameter cylindrical portion 72 (C) whose axial length is longer than that of the large-diameter cylindrical portion 72 (B), so that the total length is longer than that of the connection protection cover body 70 (B). Has also been long.

  As shown in FIG. 7, the connection protection cover body 70 is, for example, the inner periphery of the engagement recess 47 of the base protection cover body 30 at the outer periphery of the engagement claw 62 as in the case of the connection protection cover 31 of the first embodiment. It will be engaged with the part. At that time, the engagement taper cylinder portion 51 is fitted into the engagement taper tube portion 41 and the engagement step portion 52 is brought into contact with the engagement step portion 42, whereby the base protection cover body 30 and the connection protection cover body 70. Are connected so as not to be relatively movable in the axial direction and the radial direction.

  Further, as shown in FIG. 8, the connection protection cover body 70 is similar to the connection protection cover 31 of the first embodiment, and the engagement recess 63 of the other connection protection cover body 31 at the outer peripheral portion of the engagement claw portion 62. It is also possible to engage with the inner peripheral part. At that time, the engagement taper cylinder portion 51 is fitted into the engagement taper cylinder portion 56 and the engagement step portion 52 is brought into contact with the engagement step portion 57, thereby the connection protection cover body 31 and the connection protection cover body 70. Are connected so as not to be relatively movable in the axial direction and the radial direction.

  In the second embodiment, one of the plurality of base protective cover bodies 30 (A) to 30 (C) described above and one of the plurality of connected protective cover bodies 70 (A) to 70 (C). One of the plurality of base protective cover bodies 30 (A) to 30 (C), or at least one of the plurality of connected protective cover bodies 31 (A) to 31 (C) A plurality of protective covers 14 having different overall lengths and having a large-diameter cylindrical portion 72 at the end are produced by combining one of the plurality of connected protective cover bodies 70 (A) to 70 (C). be able to.

  For example, as shown in FIG. 7, the protective cover 14 is produced by combining the base protective cover body 30 (C) and the connection protective cover body 70 (A), or as shown in FIG. The protective cover 14 is produced by combining (A), the connection protection cover body 31 (A), the connection protection cover body 31 (B), and the connection protection cover body 70 (B), so that the end portion has a large diameter. The protective cover 14 having various axial lengths having the cylindrical portion 72 can be manufactured. Also in this case, when a plurality of the connection protection cover bodies 31 (A) to 31 (C) are used, a plurality of the same in the axial direction length may be connected.

  According to the cylinder device 11 according to the second embodiment described above, a plurality of connection protection cover bodies 70 having the large-diameter large-diameter cylindrical portion 72 and having different overall lengths and axial lengths of the large-diameter cylindrical portion 72 are prepared. By doing so, the diameter can be varied from an arbitrary position of the protective cover 14. Therefore, with respect to a plurality of specifications of the cylinder device 11 and the like having different protrusions and different positions, the manufacturing cost is suppressed and the large-diameter cylindrical part 72 having an appropriate length is provided at an appropriate position. A protective cover 14 having an overall length can be attached.

“Third Embodiment”
Next, a cylinder device according to a third embodiment of the present invention will be described mainly with reference to FIGS. 9 and 10 focusing on differences from the first embodiment. Portions common to the first embodiment have the same names and the same symbols.

  In 3rd Embodiment, it has the connection protection cover body 80 which changed the partial structure of the connection protection cover body 31. As shown in FIG. The connection protection cover body 80 is integrally formed of a resin material. As shown in FIG. 9, the engagement cylindrical portion 50, the engagement taper cylinder portion 51, and the engagement step portion 52 are the same as the connection protection cover body 31. And an engaging cylindrical portion 53. Therefore, this connection protection cover body 80 also has an engaging claw portion 62.

  The connection protection cover body 80 extends from the end of the engagement cylindrical portion 53 on the side opposite to the engagement step portion 52 so as to gradually increase in diameter to the side opposite to the engagement step portion 52 and expands the diameter. A tapered portion 81 is formed, and the diameter-expanded tapered portion 81 extends from the end on the opposite side to the engaging cylindrical portion 53 so as to gradually reduce the diameter to the opposite side to the engaging cylindrical portion 53, and then contracted. A diameter taper portion 82 is formed. And the bellows part 83 which makes the bellows shape which can be expanded-contracted is comprised by forming these diameter-expansion taper part 81 and the diameter-reduction taper part 82 by predetermined plural alternately. The end portion of the bellows portion 83 opposite to the engaging claw portion 62 is a reduced diameter tapered portion 82, and the end portion of the reduced diameter tapered portion 82 opposite to the engaging claw portion 62 is A cylindrical end cylindrical portion 84 extending to the opposite side of the engaging claw portion 62 is formed. The end cylindrical portion 84 is formed to have the same outer diameter and inner diameter as the engaging cylindrical portion 50 and the engaging cylindrical portion 53.

  Also in this connection protection cover body 80, the engaging cylindrical portion 50, the engaging tapered cylindrical portion 51, the engaging stepped portion 52, the engaging cylindrical portion 53, the bellows portion 83, and the end cylindrical portion 84 are formed coaxially. ing. Further, the bellows portion 83 has a maximum outer diameter larger than that of the engagement cylindrical portion 50 and the engagement cylindrical portion 53 and larger than that of the engagement claw portion 62, and a minimum inner diameter is smaller than that of the engagement cylinder. It has the same inner diameter as the portion 50, the engagement cylindrical portion 53 and the end cylindrical portion 84.

  As shown in FIG. 10, the connection protection cover body 80 has an inner peripheral portion of the engagement concave portion 47 of the base protection cover body 30 at the outer peripheral portion of the engagement claw portion 62, similarly to the connection protection cover 31 of the first embodiment. Will be engaged. At that time, the engagement taper cylinder portion 51 is fitted into the engagement taper tube portion 41 and the engagement step portion 52 is brought into contact with the engagement step portion 42, whereby the base protection cover body 30 and the connection protection cover body 80. Are connected so as not to be relatively movable in the axial direction and the radial direction.

  In the third embodiment, by combining one of the plurality of base protective cover bodies 30 (A) to 30 (C) described above and the connection protective cover body 80, the overall length differs, and the bellows portion 83. A plurality of protective covers 14 can be produced.

  For example, as shown in FIG. 8, the protective cover 14 can be manufactured by combining the base protective cover body 30 (B) and the connection protective cover body 80.

  According to the cylinder device 11 according to the third embodiment described above, since the connection protective cover body 80 having the expandable / contractible bellows portion 83 is provided, the bellows portion that can be expanded / contracted from an arbitrary position of the protective cover 14. 83 can be arranged. Therefore, a dust boot function can be added to the protective cover 14.

DESCRIPTION OF SYMBOLS 11 Cylinder apparatus 12 Cylinder 13 Rod 14 Protective cover 30 Base protective cover body (1st protective cover body)
31 Linked protective cover body (second protective cover body, third protective cover body)
47 Engaging recess (first engaging part)
62 engaging claw (second engaging portion, fourth engaging portion)
63 Engaging recess (third engaging part)

Claims (3)

In a cylinder device comprising a cylinder and a rod extended and retractable from the cylinder, and a protective cover that covers the rod and the cylinder is attached to the rod.
The protective cover is formed of a resin material, covers the rod and the cylinder, and has a first protective cover body having a first engaging portion at one end, and engages with the first engaging portion. A cylinder device comprising a second protective cover body having a second engagement portion at one end. In a cylinder device comprising a cylinder and a rod extended and retractable from the cylinder, and a protective cover for covering the rod and the cylinder attached to the rod,
The protective cover is formed of a resin material, covers the rod and the cylinder, and has a first protective cover body having a first engaging portion at one end, and engages with the first engaging portion. A second protective cover body having a second engaging portion at one end portion and a third engaging portion at the other end portion; and a fourth engaging portion engaging with the third engaging portion. A cylinder device comprising a third protective cover body at one end.   The outer peripheral part of the second engaging part of the second protective cover body is engaged with the inner peripheral part of the first engaging part of the first protective cover body. Item 3. The cylinder device according to Item 1 or 2.

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