JP2010174953A - Cylinder device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder device, which is reduced in cost. <P>SOLUTION: A mounting eye 18 includes a cylindrical part 20 fixed to a cylinder 12, a cylindrical elastic member 21 fitted to the inner circumference of the cylindrical part 20, a first cylindrical member 22 fixed to the inner circumference of the elastic member 21, and a second cylindrical member 23 inserted to the first cylindrical member 22 and having an axial length longer than the first cylindrical member 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cylinder device.

  Some cylinder devices are provided with an attachment eye for attachment to an attachment destination (see, for example, Patent Document 1).

JP 2001-221273 A

  The mounting eye needs to be produced according to the specifications of the mounting destination, and there is room for improvement from the viewpoint of cost reduction.

  Therefore, an object of the present invention is to provide a cylinder device that can reduce the cost.

  In order to achieve the above-mentioned object, the present invention provides a cylindrical part whose mounting eye is fixed to a cylinder or a piston rod, a cylindrical elastic member fitted to the inner periphery of the cylindrical part, It consists of the 1st cylindrical member fixed to the inner periphery, and the 2nd cylindrical member longer in an axial direction than this 1st cylindrical member inserted in this 1st cylindrical member.

  According to the present invention, the cost can be reduced.

The cylinder apparatus which concerns on 1st Embodiment of this invention is shown, and it is the front view which made the principal part the cross section. The principal part of the cylinder apparatus which concerns on 1st Embodiment of this invention is shown, (a) is an exploded sectional view, (b) is a front sectional view. The principal part of the cylinder apparatus which concerns on 2nd Embodiment of this invention is shown, (a) is an exploded sectional view, (b) is a front sectional view. The principal part of the cylinder apparatus which concerns on 3rd Embodiment of this invention is shown, (a) is an exploded sectional view, (b) is a front sectional view. The principal part of the cylinder apparatus which concerns on 4th Embodiment of this invention is shown, (a) is an exploded sectional view, (b) is a front sectional view. The principal part of the cylinder apparatus which concerns on 5th Embodiment of this invention is shown, (a) is an exploded sectional view, (b) is a front sectional view. The principal part of the cylinder apparatus which concerns on 6th Embodiment of this invention is shown, (a) is an exploded sectional view, (b) is a front sectional view. The principal part of the cylinder apparatus which concerns on 7th Embodiment of this invention is shown, (a) is an exploded sectional view, (b) is a front sectional view, (c) is a side view which shows the modification of a color | collar.

“First Embodiment”
A cylinder device according to a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

  As shown in FIG. 1, a cylinder device 11 according to the first embodiment includes a substantially cylindrical cylinder 12 in which a fluid is sealed, and one axial end of the cylinder 12 that is disposed on the central axis of the cylinder 12. A piston rod 13 projecting outward from an opening (not shown) formed on the cylinder, and a covered cylindrical cover 14 fixed to the outer projecting portion of the piston rod 13 and covering the opening side (not shown) of the cylinder 12. Have. Although not shown, a piston is fixed to one end of the cylinder 12 of the piston rod 13. The piston divides the inside of the cylinder 12 into two chambers and slides inside the cylinder 12 to increase the volume of the two chambers. A damping force is generated by the flow resistance of the fluid generated at that time. That is, the cylinder device 11 is a shock absorber. Specifically, it is a shock absorber constituting a suspension device of a vehicle.

  The other end of the cylinder 12 opposite to the protruding side of the piston rod 13 in the axial direction is closed by a base cap 17, and a cylindrical attachment is provided outside the base cap 17 constituting the other end of the cylinder 12. The eye 18 is fixed.

  The mounting eye 18 has a cylindrical shape and a metallic cylinder portion 20 fixed by welding to the base cap 17 on the outer peripheral side in a posture in which the central axis is arranged in a direction orthogonal to the central axis of the cylinder 12. A cylindrical rubber elastic member 21 fitted to the inner periphery of the cylindrical portion 20; a first cylindrical member 22 made of a cylindrical steel pipe member fixed to the inner periphery of the elastic member 21; It consists of the 2nd cylindrical member 23 which consists of a cylindrical steel pipe material inserted in this 1st cylindrical member 22 so that attachment or detachment was possible. In addition, the cylinder part 20, the elastic member 21, the 1st cylindrical member 22, and the 2nd cylindrical member 23 are arrange | positioned coaxially.

  Here, the elastic member 21 is formed to have a longer axial length than the cylindrical portion 20 so as to cover both axial end surfaces of the cylindrical portion 20, and the elastic member 21 and the first cylindrical member 22 have the same axial direction. It is formed long and is aligned in the axial direction. On the other hand, the axial length of the second cylindrical member 23 is longer than that of the first cylindrical member 22.

  As shown in FIG. 2, the first cylindrical member 22 has a female thread 24 formed on the inner peripheral surface thereof, and guides the insertion of the second cylindrical member 23 on the inner peripheral side of both end portions in the axial direction. For this purpose, a chamfer 25 is formed.

  Further, the second cylindrical member 23 is formed with a male screw 26 on the outer peripheral surface, and a chamfer 27 for facilitating insertion into the first cylindrical member 22 is formed on the outer peripheral side of both end portions in the axial direction. Has been.

  Then, the second cylindrical member 23 is screwed into the female screw 24 of the first cylindrical member 22 so that the second cylindrical member 23 is screwed into the first cylindrical member 22 and fixed at an appropriate position. Will be.

  Although such a cylinder device 11 is not shown, the shaft member is inserted inside the second cylindrical member 23 and attached to the vehicle body side. The diameter of the shaft member and the cylinder device on the vehicle body side are attached. 11 may be different depending on the vehicle type. That is, the inner diameter φD and the axial length L shown in FIG. 1 of the second cylindrical member 23 may differ depending on the vehicle type. Even in such a case, if only the second cylindrical member 23 is replaced with one having the same outer diameter and male screw 26 and having the set inner diameter φD and the axial length L, the mounting eye The other 18 parts are common and can be handled.

  That is, according to the cylinder device 11 of the first embodiment, the mounting eye 18 has the cylindrical portion 20 fixed to the cylinder 12, the cylindrical elastic member 21 fitted to the inner periphery of the cylindrical portion 20, Since the first cylindrical member 22 fixed to the inner periphery of the elastic member 21 and the second cylindrical member 23 inserted in the first cylindrical member 22 and longer in the axial direction than the first cylindrical member 22, It is possible to meet the specifications of the attachment destination simply by exchanging the two cylindrical members 23. Therefore, it is not necessary to produce all of the attachment eyes 18 according to the specification of the attachment destination, and the cost can be reduced.

“Second Embodiment”
Next, a cylinder device according to a second embodiment of the present invention will be described mainly with reference to FIG. 3 focusing on differences from the first embodiment. Portions common to the first embodiment have the same names and the same symbols.

  Also in the second embodiment, the first cylindrical member 22A made of a cylindrical steel pipe material having the same axial length as that of the elastic member 21 is fixed to the inner periphery of the elastic member 21 with the axial position aligned. The inner peripheral surface of the first cylindrical member 22A of the second embodiment is formed as a cylindrical surface 30 without forming a female screw, and insertion of the second cylindrical member 23A described later is inserted into the inner peripheral side of both axial end portions. A chamfer 31 for guiding is formed.

  Also in the second embodiment, the second cylindrical member 23A made of a cylindrical steel pipe material having an axial length longer than the first cylindrical member 22A is detachably inserted into the first cylindrical member 22A. The In the second cylindrical member 23A of the second embodiment, male threads 32 are formed in a predetermined range on both axial sides of the outer peripheral surface, and insertion into the first cylindrical member 22A is performed on the outer peripheral side of both axial end portions. A chamfer 33 is formed for ease. The axial length of the male screw 32 on both sides of the second cylindrical member 23A is the same, and the axial length of the cylindrical surface 34 between them is shorter than the axial length of the first cylindrical member 22A. Yes. Further, the inner diameter of the first cylindrical member 22A is slightly larger than the outer diameter of the second cylindrical member 23A so that the second cylindrical member 23A can be inserted.

  Then, the second cylindrical member 23A is inserted into the first cylindrical member 22A so that the male screws 32 on both sides protrude from both sides of the first cylindrical member 22A. A lock ring 35 is screwed into each male screw 32 with a female screw 36 formed on the inner peripheral side. In this manner, the second cylindrical member 23A inserted into the first cylindrical member 22A is fixed at an appropriate position by screwing the lock rings 35 on both sides and sandwiching the first cylindrical member 22A with these. Will be.

  Also in the second embodiment, when the inner diameter and the axial length of the second cylindrical member 23A are different depending on the specifications of the attachment destination, only the second cylindrical member 23A is shared, and the outer diameter and the male screw 32 are common. In this case, if it is replaced with one having the set inner diameter and axial length, the other parts of the mounting eye 18 including the lock ring 35 can be handled in common. Therefore, it is not necessary to produce all of the attachment eyes 18 according to the specification of the attachment destination, and the cost can be reduced.

“Third Embodiment”
Next, a cylinder device according to a third embodiment of the present invention will be described mainly with reference to FIG. 4 focusing on differences from the first embodiment. Portions common to the first embodiment have the same names and the same symbols.

  Also in the third embodiment, the first cylindrical member 22B made of a cylindrical steel pipe material having an axial length equivalent to that of the elastic member 21 is fixed to the inner periphery of the elastic member 21 with its axial position aligned. The inner peripheral surface of the first cylindrical member 22B of the third embodiment is formed as a cylindrical surface 40 without forming a female screw, and the second cylindrical member 23B described later is inserted into the inner peripheral side of both axial end portions. A chamfer 41 for guiding is formed.

  Also in the third embodiment, the second cylindrical member 23B made of a cylindrical steel pipe material whose axial length is longer than the first cylindrical member 22B is detachably inserted into the first cylindrical member 22B. . The second cylindrical member 23B of the third embodiment has an outer peripheral surface that is not formed with male threads and is a cylindrical surface 43, and can be easily inserted into the first cylindrical member 22B on the outer peripheral side of both axial ends. A chamfer 44 is formed. Here, the outer diameter of the second cylindrical member 23B is formed larger than the inner diameter of the first cylindrical member 22B by an amount corresponding to the press-fitting allowance.

  Then, the second cylindrical member 23B is press-fitted into the first cylindrical member 22B to a predetermined position. Thereby, the 2nd cylindrical member 23B inserted in the 1st cylindrical member 22B is fixed in a suitable position.

  Also in the third embodiment, when the inner diameter and the axial length of the second cylindrical member 23B are different depending on the specification of the attachment destination, only the second cylindrical member 23B has the same outer diameter. If it is exchanged for one having a set inner diameter and axial length, the other parts of the mounting eye 18 can be handled in common. Therefore, it is not necessary to produce all of the attachment eyes 18 according to the specification of the attachment destination, and the cost can be reduced.

“Fourth Embodiment”
Next, a cylinder device according to a fourth embodiment of the present invention will be described mainly with reference to FIG. 5 with a focus on differences from the first embodiment. Portions common to the first embodiment have the same names and the same symbols.

  Also in the fourth embodiment, the first tubular member 22C made of a cylindrical steel pipe material having an axial length equivalent to that of the elastic member 21 is fixed to the inner periphery of the elastic member 21 with the axial position aligned. The inner peripheral surface of the first cylindrical member 22C of the fourth embodiment is formed as a cylindrical surface 47 without forming a female screw, and insertion of a second cylindrical member 23C described later is inserted into the inner peripheral side of both axial end portions. A chamfer 48 for guiding is formed.

  Also in the fourth embodiment, the second cylindrical member 23C made of a cylindrical steel pipe material having an axial length longer than the first cylindrical member 22C is detachably inserted into the first cylindrical member 22C. The The outer peripheral surface of the second cylindrical member 23C of the fourth embodiment is not formed with a male thread but is a cylindrical surface 49. Two annular ring grooves 50 are provided at predetermined intermediate positions on both sides in the axial direction of the cylindrical surface 49. Further, chamfers 51 are formed on the outer peripheral sides of both ends in the axial direction for facilitating insertion into the first cylindrical member 22C. Here, the inner diameter of the first cylindrical member 22C is slightly larger than the outer diameter of the second cylindrical member 23C so that the second cylindrical member 23C can be inserted. The distance between the ring grooves 50 is formed to be equal to the axial length of the first cylindrical member 22C.

  Then, the second cylindrical member 23C is inserted into the first cylindrical member 22C so that the ring grooves 50 on both sides thereof are exposed from both sides of the first cylindrical member 22C, and both sides of the second cylindrical member 23C are inserted. Each of the ring grooves 50 is engaged with a C-shaped ring 52 having a C-shaped expansion / contraction diameter. In this way, by sandwiching the first cylindrical member 22C with the C-rings 52 on both sides, the second cylindrical member 23C inserted into the first cylindrical member 22C is fixed at an appropriate position. .

  Also in the fourth embodiment, when the inner diameter and the axial length of the second cylindrical member 23C are different depending on the specification of the attachment destination, only the second cylindrical member 23C is changed to the outer diameter and the ring groove 50. If it is replaced with a common one having a set inner diameter and axial length, other parts of the mounting eye 18 including the C-ring 52 can be handled by a common one. Therefore, it is not necessary to produce all of the attachment eyes 18 according to the specification of the attachment destination, and the cost can be reduced.

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

  In the fifth embodiment, a first cylindrical member 22D made of a cylindrical steel pipe material having an axial length longer than this is fixed to the inner periphery of the elastic member 21 with the axial center position thereof aligned. The first cylindrical member 22D of the fifth embodiment has a cylindrical surface 55 having an inner peripheral surface without a female thread, and screw holes 56 penetrating in the radial direction at both outer positions than the elastic member 21 are 180 degrees. It is formed in two places with a phase shift. Further, the first cylindrical member 22D is formed with a chamfer 57 for guiding the insertion of a second cylindrical member 23D, which will be described later, on the inner peripheral side of both end portions in the axial direction.

  Also in the fifth embodiment, the second cylindrical member 23D made of a cylindrical steel pipe member having an axial length longer than the first cylindrical member 22D is detachably inserted into the first cylindrical member 22D. . The outer peripheral surface of the second cylindrical member 23D of the fifth embodiment is not formed with a male screw but is a cylindrical surface 59, and a screw hole along the radial direction at a predetermined intermediate position on both axial sides of the cylindrical surface 59. 60 are formed at two positions with a phase difference of 180 degrees, and chamfers 61 for facilitating insertion into the first tubular member 22D are formed on the outer peripheral side of both axial ends. Here, the inner diameter of the first cylindrical member 22D is slightly larger than the outer diameter of the second cylindrical member 23D so that the second cylindrical member 23D can be inserted. Further, the formation interval of the screw holes 56 in the axial direction of the first cylindrical member 22D is formed to be equal to the formation interval of the screw holes 60 in the axial direction of the second cylindrical member 23D.

  Then, the second cylindrical member 23D is inserted into the first cylindrical member 22D so that all the screw holes 60 are aligned with all the screw holes 56 of the first cylindrical member 22D. The female screw 63 is screwed into the screw hole 56 of the member 22D and the screw hole 60 of the second cylindrical member 23D that are aligned with each other. In this manner, the second cylindrical member 23D inserted into the first cylindrical member 22D is positioned at an appropriate position by fastening the second cylindrical member 23D to the first cylindrical member 22D with the four set screws 63. It will be fixed at.

  In the fifth embodiment as well, when the inner diameter and the axial length of the second cylindrical member 23D are different depending on the specification of the attachment destination, only the second cylindrical member 23D is changed to the outer diameter and the screw hole 60. If it is replaced with a common one having a set inner diameter and axial length, other parts of the mounting eye 18 can be handled by a common one including the female screw 63. Therefore, it is not necessary to produce all of the attachment eyes 18 according to the specification of the attachment destination, and the cost can be reduced.

“Sixth Embodiment”
Next, a cylinder device according to a sixth embodiment of the present invention will be described mainly with reference to FIG. 7 focusing on the differences from the first embodiment. Portions common to the first embodiment have the same names and the same symbols.

  Also in the sixth embodiment, the first cylindrical member 22E made of a cylindrical steel pipe material having the same axial length as that of the elastic member 21 is fixed to the inner periphery of the elastic member 21 with its axial position aligned. The inner peripheral surface of the first cylindrical member 22E of the fifth embodiment is not formed with a female screw, but is a cylindrical surface 65. Insertion of a second cylindrical member 23E, which will be described later, into the inner peripheral side of both end portions in the axial direction. A chamfer 66 for guiding is formed.

  In the sixth embodiment, a second cylindrical member 23E composed of a pair of divided bodies 68 made of a steel pipe material is detachably inserted into the first cylindrical member 22E. The divided body 68 includes a cylindrical cylindrical portion 70 and a flange portion 71 that extends radially outward from one axial end of the cylindrical portion 70. A chamfer 72 for facilitating insertion into the first tubular member 22E is formed on the outer peripheral surface side of the end portion of the cylindrical portion 70 opposite to the flange portion 71. Here, the outer diameter of the cylindrical portion 70 of the divided body 68 is formed larger than the inner diameter of the first cylindrical member 22E by the amount of the press-fitting allowance. Further, the axial length of the cylindrical portion 70 of the divided body 68 is less than or equal to half the axial length of the first cylindrical member 22E.

  Then, the pair of divided bodies 68 constituting the second cylindrical member 23E are press-fitted into the first cylindrical member 22E from both sides until the flange portion 71 comes into contact with the axial end surface of the first cylindrical member 22E. Thereby, the 2nd cylindrical member 23E with a long axial direction by this is fixed to the 1st cylindrical member 22E in the insertion state.

  In the sixth embodiment as well, when the inner diameter and the axial length of the second cylindrical member 23E are different depending on the specifications of the attachment destination, only the pair of divided bodies 68 constituting the second cylindrical member 23E are used. The outer diameter of the cylindrical portion 70 is common, and if the cylindrical portion 70 is replaced with one having a set inner diameter and an axial length, the other parts of the mounting eye 18 are common and can be handled. Therefore, it is not necessary to produce all of the attachment eyes 18 according to the specification of the attachment destination, and the cost can be reduced.

  Moreover, since the some division body 68 which comprises the 2nd cylindrical member 23E is inserted in the 1st cylindrical member 22E from both sides, the press-fitting length of one member becomes short and attachment by press-fit becomes easy.

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

  Also in the seventh embodiment, as in the first embodiment, the first cylindrical member 22F made of a cylindrical steel pipe material having an axial length equivalent to the inner circumference of the elastic member 21 is aligned with the axial position. Is fixed. The first cylindrical member 22F of the seventh embodiment has internal threads 73 formed on the inner peripheral surface, and is chamfered to guide the insertion of the second cylindrical member 23F, which will be described later, on the inner peripheral side of both axial ends. 74 is formed.

  Further, in the seventh embodiment, the first cylindrical member 22F is a second member constituted by a pair of divided bodies 75 made of a steel pipe material and a washer 76 made of a steel pipe material interposed therebetween. The cylindrical member 23F is detachably inserted. The divided body 75 has a cylindrical cylindrical portion 80 and a flange portion 81 that extends radially outward from one axial end of the cylindrical portion 80. A male screw 82 is formed on the outer peripheral side of the cylindrical portion 80, and a chamfer 83 for facilitating insertion into the first cylindrical member 22F is provided on the outer peripheral side of the end opposite to the flange portion 81. Is formed. The washer 76 has a cylindrical shape.

  Then, with the washer 76 inserted inside the first cylindrical member 22F, the pair of divided bodies 75 constituting the second cylindrical member 23F are screwed into the female thread 73 of the first cylindrical member 22F from both sides in the axial direction. 82 is screwed and inserted. And the washer 76 is pinched | interposed with the division body 75 of both sides, and axial force is generated. Thereby, the 2nd cylindrical member 23F with a long axial direction by this is fixed to the 1st cylindrical member 22F in the insertion state.

  Also in the seventh embodiment, when the inner diameter and the axial length of the second cylindrical member 23F are different depending on the specifications of the attachment destination, only the pair of divided bodies 75 and washers 76 of the second cylindrical member 23F. If the male screw 82 of the divided body 75 is common and is replaced with one having a set inner diameter and axial length, the other parts of the mounting eye 18 can be handled by the common one. In particular, when only the length in the axial direction is different, it can be dealt with by replacing only the washer 76. Therefore, it is not necessary to produce all of the attachment eyes 18 according to the specification of the attachment destination, and the cost can be reduced.

  In addition, since the washer 76 is interposed between the plurality of divided bodies 75 of the second cylindrical member 23F, the pair of divided bodies 75 are screwed into the first cylindrical member 22F, and these are first cylindrical. The axial force for holding the member 22F can be generated satisfactorily.

  As shown in FIG. 8C, if the radial grooves 85 are formed on both end surfaces of the washer 76 in the axial direction, the frictional resistance with the divided body 75 in contact with the end surface of the washer 76 can be increased. In addition, it is possible to prevent the divided body 75 from being loosened.

  In the above first to seventh embodiments, the case where the mounting eye 18 is fixed to the cylinder 12 has been described as an example. However, the mounting eye is connected to the other end of the piston rod 13 that protrudes from the opening of the cylinder 12 that is not shown. In the case where is fixed, the structures of the first to seventh embodiments can be applied to this mounting eye.

11 cylinder device 12 cylinder 13 piston rod 18 mounting eye 20 cylinder part 21 elastic member 22, 22A, 22B, 22C, 22D, 22E, 22F first cylindrical member 23, 23A, 23B, 23C, 23D, 23E, 23F second Cylindrical member 68,75 Split body 76 Washer 85 Groove

Claims (4)

A cylinder having an opening at one end;
A piston sliding inside the cylinder;
A piston rod having one end fixed to the piston and the other end protruding from the opening of the cylinder;
A cylinder device comprising a cylindrical mounting eye fixed to the other end of the cylinder or the other end of the piston rod,
The mounting eye includes a cylindrical portion fixed to the cylinder or the piston rod, a cylindrical elastic member fitted to the inner periphery of the cylindrical portion, and a first cylinder fixed to the inner periphery of the elastic member. A cylinder device comprising: a cylindrical member; and a second cylindrical member that is longer in the axial direction than the first cylindrical member inserted into the first cylindrical member.   The cylinder device according to claim 1, wherein the second cylindrical member includes a plurality of divided bodies, and the divided bodies are inserted into the first cylindrical member from both sides.   The cylinder device according to claim 2, wherein a washer is interposed between the plurality of divided bodies of the second cylindrical member.   The cylinder device according to claim 3, wherein a groove is formed on an end face in the axial direction of the washer.

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