WO2019087690A1

WO2019087690A1 - Cylinder device and method for manufacturing cylinder device

Info

Publication number: WO2019087690A1
Application number: PCT/JP2018/037370
Authority: WO
Inventors: 宜浩柴田
Original assignee: Ｋｙｂ株式会社
Priority date: 2017-11-06
Filing date: 2018-10-05
Publication date: 2019-05-09
Also published as: JP6956596B2; JP2019086056A

Abstract

In a bracket (B) attached to the outer periphery of an outer shell provided with a protruding part, a wide hole (8a) which accommodates the insertion of the protruding part is formed from one side portion toward a back portion of a tubular part (4) that grips the outer periphery of the outer shell and has a C-shaped cross section, and on the other side portion of the tubular part (4) a bridge section (4b) and a narrow hole (8b) which is partitioned from the wide (hole 8a) in the peripheral direction by the bridge section (4b) are formed.

Description

Cylinder device and method of manufacturing cylinder device

The present invention relates to a cylinder device and a method of manufacturing the cylinder device.

Conventionally, some cylinder devices function as a shock absorber and have a damping force variable valve attached to the side of the outer shell, as disclosed in, for example, JP2015-059574A. In the shock absorber, the damping force variable valve can adjust the resistance given to the flow of the hydraulic fluid generated at the time of expansion and contraction of the shock absorber to thereby adjust the damping force generated by the shock absorber. Furthermore, by providing the variable damping force valve radially outward on the side of the outer shell, the axial length of the shock absorber can be shortened without sacrificing the shock stroke length of the shock absorber. Therefore, in such a cylinder device, the mountability can be improved.

In addition, some cylinder devices are used for strut type suspensions, and are connected to knuckles via brackets fixed by welding to the outer periphery of the lower end of the outer shell, and used as columns for positioning the wheels. When the cylinder device having the bracket includes a protrusion such as the aforementioned variable damping force valve, the protrusion may be disposed at a portion covered by the bracket. In that case, for example, as disclosed in JP2015-197129A, the bracket is provided with a hole allowing insertion of the protrusion, and the protrusion is welded to the side portion of the outer shell exposed by the hole.

The bracket of the cylinder device used for the strut type suspension is a cylindrical portion having a C-shaped cross section which embraces the outer periphery of the outer shell, and extends substantially in parallel radially outward from both ends in the circumferential direction of the cylindrical portion. And a pair of mounting portions. And a bracket is fixed in the state which pinched a knuckle arm with a pair of attachment parts.

In the tubular portion of such a bracket, a portion where a pair of attaching portions are in a row is a front portion, and the front portion is directed to the front, and an axis passing through the center of the tubular portion is arranged to extend in the vertical direction. Assuming that the left and right portions are side portions, it may be preferable in some cases to project the protrusion to be welded to the outer shell outward from the side portion of the cylindrical portion for convenience of the vehicle layout (for example, JP2015 -197129 A Figure 2).

However, in the state where the projection is thus protruded outward from the side portion of the cylindrical portion, welding is difficult even if the hole for inserting the projection is enlarged. This is because the attachment portion is continuous with the front portion of the cylindrical portion and the distance between the protrusion and the attachment portion is short, so the attachment portion interferes with the welding operation. Therefore, when welding is performed by setting the outer shell with the bracket mounted on the outer periphery and the projection to the machine for welding, parts constituting the machine, such as the torch or an arm for driving the torch, and the like In order to avoid interference with the mounting portion, the size of the welding machine may be large, which may increase the cost, or it may be necessary to give up automatic welding by the machine.

Therefore, the present invention is a cylinder device capable of easily welding the protrusion to the outer shell even if the protrusion is protruded outward from the side portion of the cylindrical portion in a state where the bracket is fixed to the outer shell by welding or the like. And a method of manufacturing a cylinder device.

In the cylinder device which solves the above-mentioned subject, in the bracket attached to the perimeter of the outer shell which provided the projection, the projection is projected from one side to the back of the cylindrical part of cross section C shape which grips the perimeter of the outer shell While the wide hole which permits penetration of this is formed, the narrow hole divided by the bridge part and the wide hole and the circumferential direction by the bridge part is formed in the other side part of a cylindrical part.

According to the above configuration, the protrusion can be made to protrude outward from the side portion of the cylindrical portion while the protrusion is inserted into the wide hole, or can be made to protrude outward from the back. For this reason, even when projecting the protrusion outwardly from the side portion of the cylindrical portion when the cylinder device is completed, when welding the projecting portion, the projection is projected outward from the back of the cylindrical portion. , The mounting portion is directed to the opposite side of the projection.

FIG. 1 is a mounting view showing a mounting state of a shock absorber which is a cylinder device according to one embodiment of the present invention. FIG. 2 is a longitudinal sectional view schematically showing a longitudinal section of a main body of a shock absorber which is a cylinder apparatus according to an embodiment of the present invention. FIG. 3 is a right side view showing a bracket of a shock absorber which is a cylinder device according to one embodiment of the present invention. FIG. 4 is a left side view showing a bracket of a shock absorber which is a cylinder device according to one embodiment of the present invention. FIG. 5 is a front view showing a bracket of a shock absorber which is a cylinder device according to one embodiment of the present invention. FIG. 6 is a plan view showing a bracket of a shock absorber which is a cylinder device according to one embodiment of the present invention. FIG. 7 is a reference view showing the shapes of the wide hole and the narrow hole when the bracket of the shock absorber which is the cylinder device according to one embodiment of the present invention is developed. FIG. 8 is an explanatory view of a manufacturing process of a bracket in a shock absorber which is a cylinder device according to one embodiment of the present invention. FIG. 9 is an explanatory view of a manufacturing process of a shock absorber which is a cylinder device according to one embodiment of the present invention, and FIGS. 9 (a) and 9 (b) show a state of the shock absorber during projection welding. 9 (c) (d) (e) shows the state of the shock absorber at the time of bracket welding. FIG. 10 is an explanatory view of a manufacturing process of a shock absorber which is a cylinder device according to one embodiment of the present invention, and FIGS. 10 (a) (b) (c) show the state of the shock absorber during drilling processing. Show.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals as in the several figures indicate the same parts.

As shown in FIG. 1, a cylinder device according to an embodiment of the present invention is a shock absorber A used for a strut type suspension, and is used for a vehicle such as a four-wheeled vehicle. In the following description, the upper and lower sides of the shock absorber A attached to the vehicle will be simply referred to as “upper” and “lower” unless specifically described.

The shock absorber A includes a main body D having an outer shell 1 and a rod 2 axially and movably inserted into the outer shell 1, and a bracket B connecting a lower end of the outer shell 1 to a wheel W. A mount (not shown) for connecting the upper end of the rod 2 projecting upward of the outer shell 1 to the vehicle body, an upper spring bearing (not shown) attached to the mount, and a lower attached to the outer periphery of the outer shell 1 It comprises a side spring rest 10 and a suspension spring S interposed between the upper and lower spring rests.

The bracket B of the present embodiment is a knuckle bracket fixed to a knuckle N that rotatably supports the wheel W, and is bolted to the knuckle arm n1. That is, the main body D of the shock absorber A is connected to the knuckle N via the bracket B which is a knuckle bracket. The shock absorber A functions as a support for positioning the wheel W, and the rod 2 moves in and out of the outer shell 1 when the vehicle W travels up and down with respect to the vehicle body, for example, by traveling on the uneven road surface. The shock absorber A expands and contracts.

At the time of expansion and contraction of the shock absorber A, since the upper and lower spring bearings move close to each other, the suspension spring S also expands and contracts. In the present embodiment, the suspension spring S is a coil spring, and when compressed, is elastically deformed to exert an elastic force corresponding to the amount of deformation. In the shock absorber A, the suspension spring S elastically supports the vehicle body.

The configuration and arrangement of the suspension spring S can be changed as appropriate. For example, the suspension spring S may be a spring other than a coil spring such as an air spring. Further, in the present embodiment, the suspension springs S are provided on the outer periphery of the main body D, and they are integrated as the shock absorber A. However, the suspension spring S may be installed separately from the shock absorber A.

Subsequently, as shown in FIG. 2, the main body D of the shock absorber A has a triple pipe structure, and the outer shell 1, the intermediate cylinder 11 provided inside the outer shell 1, and the cylinder 12 provided inside the outer shell 1. And. Further, the main body D includes a piston 20 slidably inserted in the cylinder 12, an annular rod guide 13 fitted to the upper end of the cylinder 12, and a bottom member 14 fitted to the lower end of the cylinder 12. Prepare.

The rod 2 is inserted into the rod guide 13 and axially slidably supported by the rod guide 13, and the piston 20 is connected to the lower end of the rod 2 inserted into the cylinder 12. ing. That is, the rod 2 in the present embodiment is a piston rod, and extends from one side of the piston 20 to the outside of the cylinder 12.

The outer shell 1 is cylindrical with a bottom, and has a cylindrical portion 1 a and a bottom cap 1 b for closing the lower end of the cylindrical portion 1 a. The bottom cap 1 b is the bottom of the outer shell 1. On the other hand, the upper end of the cylindrical portion 1 a is closed by the rod guide 13. Thus, the inside of the outer shell 1 is a sealed space, and the inside of the outer shell 1 contains liquid and gas such as hydraulic oil.

More specifically, a liquid chamber filled with a liquid is formed in a cylinder 12 provided inside the outer shell 1, and the liquid chamber is the piston 20 on the rod 2 side, and the expansion side chamber R1 and the opposite side thereof It is divided into a pressure side chamber R2 (on the side opposite to the rod). In the piston 20, a piston passage 20a is formed which allows only the flow of the liquid from the pressure side chamber R2 to the expansion side chamber R1.

Further, the cylindrical gap R3 formed between the cylinder 12 and the intermediate cylinder 11 is filled with a liquid. A through hole 12a is formed at a position facing the expansion side chamber R1 in the cylinder 12, and the cylindrical gap R3 is always communicated with the expansion side chamber R1 through the through hole 12a.

In addition, a liquid storage chamber R4 is formed between the intermediate cylinder 11 and the outer shell 1. A liquid is stored in the liquid storage chamber R4, and a gas is sealed on the upper side of the liquid surface. The bottom member 14 is formed with a notch 14a for guiding the liquid in the liquid storage chamber R4 between the bottom cap 1b and the bottom member 14 and allows only the flow of liquid from the liquid storage chamber R4 to the pressure side chamber R2. The suction passage 14b is formed.

Furthermore, the liquid storage chamber R4 is in communication with the cylindrical gap R3 via the discharge passage L. Further, the discharge passage L is provided with a damping force variable valve V which gives resistance to the flow of the liquid and can adjust the resistance.

According to the above configuration, when the piston 20 moves upward in the cylinder 12 and the expansion side chamber R1 is contracted at the time of expansion of the shock absorber A, the liquid in the expansion side chamber R1 moves to the cylindrical clearance R3 through the through hole 12a. The liquid in the cylindrical gap R3 moves to the liquid storage chamber R4 through the discharge passage L. Since resistance is applied to the flow of the liquid by the damping force variable valve V, the pressure of the expansion chamber R1 is increased, and an expansion damping force that hinders the expansion operation of the shock absorber A is generated. Further, at the time of extension of the shock absorber A, the suction passage 14b is opened, and the liquid in the liquid storage chamber R4 is supplied to the pressure side chamber R2 expanded through the suction passage 14b.

On the other hand, when the piston 20 moves downward in the cylinder 12 at the time of contraction of the shock absorber A and the pressure side chamber R2 contracts, the liquid in the pressure side chamber R2 moves to the expansion side chamber R1 which expands through the piston passage 20a. Further, when the shock absorber A is contracted, the liquid corresponding to two volumes of the rod entering the cylinder 12 becomes surplus in the cylinder 12, and the surplus liquid moves to the cylindrical gap R3 through the through hole 12a, The liquid in the cylindrical clearance R3 moves to the liquid storage chamber R4 through the discharge passage L. Since resistance is applied to the flow of the liquid by the damping force variable valve V, the pressure in the cylinder 12 is increased, and a pressure side damping force that prevents the contraction operation of the shock absorber A is generated.

As described above, in the present embodiment, the shock absorber A is a uniflow type, and when the shock absorber A expands and contracts, the liquid circulates the expansion side chamber R1, the liquid storage chamber R4 and the pressure side chamber R2 in this order in one passage. It is supposed to be. Further, since the liquid always flows through the discharge passage L when the shock absorber A is expanded and contracted, the single damping force variable valve V provided in the discharge passage L can exert the damping force on both sides of the expansion pressure. Furthermore, by adjusting the resistance applied to the liquid flowing through the discharge passage L by the damping force variable valve V, it is possible to adjust the damping force on both sides of the expansion pressure.

The damping force variable valve V may have any configuration, for example, a valve seat member in which a passage connected to the discharge passage L is formed, and a main valve which is seated on the valve seat member to open and close the passage. And a pilot passage for reducing the pressure on the upstream side of the main valve and guiding it to the back of the main valve, and a pilot valve provided in the middle of the pilot passage to control the back pressure of the main valve. If the pilot valve is a solenoid valve, adjusting the amount of current supplied to the pilot valve to increase or decrease the valve opening pressure of the pilot valve can increase or decrease the damping force by increasing or decreasing the valve opening pressure of the main valve. .

Further, in the present embodiment, the damping force variable valve V is housed in a case, and the case is a cylindrical sleeve welded to the edge of the mounting hole 1 c formed on the side of the outer shell 1. 30 and a cap 31 for closing the opening of the sleeve 30. According to the configuration, when the damping force variable valve V is accommodated inside the sleeve 30 welded to the outer shell 1 and the cap 31 is fitted, the damping force variable valve V can be attached to the side portion of the outer shell 1.

The case portion including the damping force variable valve V protrudes radially outward on the side portion of the outer shell 1, and in the present embodiment, the portion is the protruding portion 3. However, the protrusion 3 may not necessarily be the portion including the damping force variable valve V. In such a case, it is possible to change the configuration of the passage through which the liquid flows when the shock absorber A expands and contract, and of course, the shock absorber A exerts a damping force by providing resistance to the flow of liquid generated when the cylinder device expands and contracts. It does not have to be. For example, the cylinder device may be a shock absorber using electromagnetic force, frictional force or the like to generate a damping force, or an actuator that actively drives an object.

Subsequently, the bracket B for connecting the outer shell 1 of the shock absorber A to the knuckle N to which it is attached is curved so as to follow the outer peripheral surface of the outer shell 1, as shown in FIG. A cylindrical portion 4 having a C-shaped cross section covering the outer periphery of the shell 1, a pair of plate-

like mounting portions

5 and 6 projecting radially outward from both ends in the circumferential direction of the cylindrical portion 4, and a plurality of reinforcing members The

ribs

7a, 7b, 7c and the wide hole 8a for avoiding the interference with the protrusion 3 are provided.

In the present specification and claims, the portion provided with the pair of

attachment portions

5 and 6 is the front portion of the bracket B and the cylindrical portion 4 and the opposite portion thereof is a back portion, as shown in FIG. The left portion and the right portion in a state in which the center line X passing through the center of the cylindrical portion 4 in the axial direction is arranged to extend in the vertical direction while the pair of attachment portions 5 and 6 (front portion) face front It is the side of the left and right.

3 is a right side view with the right side of the bracket B directed to the front, FIG. 4 is a left side view with the left side of the bracket B directed to the front, and FIG. 4 is a front view with the front of the bracket B FIG. 6 is a plan view of the bracket B of FIG. 5 as viewed from the upper side. Hereinafter, for convenience of explanation, the upper, lower, left, right, front of the paper surface, and back of the bracket B shown in FIG. 5 will be referred to as “upper”, “lower”, “left”, “right”, “front”, “back” of the bracket B, respectively. "

The shape of the cylindrical portion 4 is a cylindrical shape in which a part 4a (FIG. 6) is inserted in a part in the circumferential direction. The split 4 a is formed along the axial direction at the front of the cylindrical portion 4, and when the cylindrical portion 4 is viewed from one side in the axial direction (in the axial direction), the diameter of the cylindrical portion 4 is Each cross-sectional shape when it cut | disconnects in a direction becomes C shape. And in the cylindrical part 4, the both ends of the circumferential direction which oppose the crack 4a are located ahead.

Subsequently, the left and right mounting

portions

5 and 6 extend from the circumferential ends of the cylindrical portion 4 to the front side while maintaining a predetermined distance, and are disposed face to face. Then,

ribs

7a, 7b and 7c are formed at the boundary between the left and right mounting

parts

5 and 6 and the cylindrical part 4, respectively. In the present embodiment, the

ribs

7a, 7b and 7c are respectively provided on the upper end, the axial center and the lower end of the bracket B, but the number, position and shape of the ribs can be freely set. .

Further, upper and lower

bolt insertion holes

9a and 9b are formed in the left and right mounting parts 5 and 6 (FIGS. 3 and 4). Then, the knuckle arm n1 (FIG. 1) is held by these mounting

portions

5 and 6, and from the

bolt insertion holes

9a and 9b of one mounting portion (5 or 6) to the

bolt insertion holes

9a and 9b of the other bolt mounting portion When the bolt is inserted and the nut is tightened, the bracket B is fastened to the knuckle N. Thus, when the bracket B is attached to the vehicle, the upper and lower sides of the bracket B face the upper side and the lower side of the vehicle body, and the left and right side parts of the bracket B face the front or the rear of the vehicle body.

Subsequently, the cylindrical portion 4 is provided on the left side separately from the wide hole 8a (FIGS. 3 and 4) having a long horizontal width (circumferential length) formed from the right side to the back, and the wide hole 8a. The narrow holes 8b (FIG. 4) whose width is shorter than the wide holes 8a are formed side by side in the circumferential direction. In the cylindrical portion 4, assuming that a portion separating the wide hole 8a and the narrow hole 8b is a bridge portion 4b, the bridge portion 4b is formed along the axial direction at the circumferential center of the left side portion of the cylindrical portion 4 There is. And the wide hole 8a and the narrow hole 8b adjoin the circumferential direction of the cylindrical part 4 on both sides of the bridge part 4b.

As shown in FIG. 3, in the wide hole 8a, a portion formed on the right side of the cylindrical portion 4 is a side opening 80, and a portion formed on the back of the cylindrical portion 4 is a back opening 81. Then, the side opening 80 allows the protrusion 3 to project outward from the side of the cylindrical portion 4 in a state where the bracket B is welded to the outer periphery of the outer shell 1 (FIG. 1) It has a size that can prevent B and the protrusion 3 from interfering with each other.

Further, the edge 80a of the side opening 80 is curved in a circular arc shape so as to expand to the front side. Therefore, it is easy to secure the strength of the bracket B while avoiding the interference between the edge of the wide hole 8a and the projecting portion 3 in a state where the projecting portion 3 protrudes from the side portion of the cylindrical portion 4 (FIG. 1) It is.

On the other hand, the back opening 81 protrudes with the bracket B while allowing the protrusion 3 to protrude outward from the back of the cylindrical portion 4 in a state where the outer shell 1 is inserted into the cylindrical portion 4 It has a size that can prevent the part 3 from interfering.

Also, the longitudinal width (axial length) of the back opening is longer than the longitudinal width of the side opening 80, and the lower portion of the back opening 81 protrudes downward from the side opening 80. For this reason, in a state in which the protruding portion 3 protrudes from the back of the cylindrical portion 4, the distance from the protruding portion 3 to the edge of the wide hole 8a can be long. Furthermore, even if the longitudinal width of the back opening 81 is long and the side opening 80 is located above the cylindrical portion 4, the upper and

lower edges

81 a and 81 b of the back opening 81 and the upper and lower ends of the cylindrical portion 4 The width of each portion can be secured to prevent the strength of the portion from being insufficient.

FIG. 7 shows the shapes of the wide hole 8a and the narrow hole 8b in a state in which the bracket B is developed. As shown by a two-dot chain line in FIG. 7, when the bridge portion 4b is removed and the wide hole 8a and the narrow hole 8b are viewed as a series of holes, the shape of the holes is substantially symmetrical in the left-right direction. There is. In other words, assuming that a virtual bridge portion symmetrical with the bridge portion 4b is provided at a position symmetrical with the bridge portion 4b in the cylindrical portion 4, the shape of the bracket B becomes left-right symmetry.

Further, the bridge portion 4b is formed at a position directly behind the projecting portion 3 in a state where the bracket B is welded to the outer periphery of the outer shell 1, and the straight line Z passing the center of the projecting portion 3 in the axial direction (B)) has a circumferential center on top. Then, the wide holes 8a and the narrow holes 8b located on both sides in the circumferential direction of the bridge portion 4b are opened at positions in line symmetry with at least the straight line Z as the target axis.

Hereinafter, the manufacturing method of the bracket B which concerns on this Embodiment is demonstrated.

First, a base material having an outline shape when developing the bracket B from a metal plate by punching is cut out. This base material has a line symmetrical shape with a straight line extending in the axial direction (direction that becomes the axial direction when the bracket B is completed) passing through the center thereof as a symmetry axis.

Thus, although it may be simultaneous with cutting out the outline shape of the bracket B from a metal plate or after that, as shown in FIG. 8 (a), the base material and the left and right side portions of the cylindrical portion 4 Side holes 801 and 802 are formed in the respective portions, and a central hole 810 is formed between the side holes 801 and 802. The central hole 810 and the two

side holes

801 and 802 are separated by bridge portions 4b and 4c, respectively.

Next, the base material is bent to form the

ribs

7a, 7b, 7c and the left and right mounting

parts

5 and 6, and is bent in a cylindrical shape to form a C-shaped cylindrical part 4. Then, as shown in FIGS. 8B and 8C, in the cylindrical portion 4 immediately after the bending, bridge portions 4b and 4c are formed on the left and right side portions, respectively.

Next, in the cylindrical portion 4, the bridge portion 4 c on the right side, which is the side on which the protruding portion 3 is to be protruded, is cut out by punching. Specifically, the punching die used in the bridge portion cutting step has a punch P and an outer diameter corresponding to the outer diameter of the outer shell 1 as shown in FIG. And a cylindrical die member Q in which a punched hole q1 is formed to allow insertion of

Then, the die member Q is inserted into the inside of the cylindrical portion 4 and set so that the bridge portion 4c is opposed to the opening of the removal hole q1, and the bridge portion 4c is cut off with a punch P. Then, as shown in FIGS. 8D and 8E, the side hole 802 on the bridge 4c side and the central hole 810 are connected to form the wide hole 8a. On the other hand, the side hole 801 on the side of the remaining bridge portion 4b becomes the narrow hole 8b as it is.

In addition, although the cutting-blade shape of punch P shown in FIG. 8 is elliptical, you may change this cutting-blade shape into other shapes, such as square shape, for example. Moreover, in the state which welded the bracket B to the outer shell 1, if interference with the bracket B and the protrusion part 3 can be avoided, a part of bridge part 4c by the side of cutting may remain in the completed bracket B.

Further, in the present embodiment, in order to cause the protrusion 3 to project from the right side of the bracket B when the shock absorber A is completed (FIG. 1), the bridge 4 c on the right side is cut away. However, when making the protrusion part 3 project from the left side part of the bracket B, the bridge part 4b of the left side part should just be cut off, leaving the bridge part 4c of the right side part.

Then, the manufacturing method of shock absorber A which is a cylinder apparatus concerning this embodiment is explained.

First, the outer shell 1 before the protrusion 3 is provided is inserted into the inside of the cylindrical portion 4 of the completed bracket B. Then, as shown in FIGS. 9A and 9B, the sleeve 30 is welded to the outer shell 1 while pressing the sleeve 30 against the side portion of the outer shell 1 exposed from the back opening 81 of the wide hole 8a. Then, the sleeve 30 projects outward from the back of the bracket B through the back opening 81 of the wide hole 8a.

Next, as shown in FIGS. 9C and 9D, the bracket B is shifted in the axial direction of the outer shell 1 (arrow Y1), and is rotated in the circumferential direction (arrow Y2) to widen the protrusion 3. The tubular portion 4 is welded to the outer shell 1 while being moved to the side opening 80 of 8 a. Then, the sleeve 30 welded to the side of the outer shell 1 in the previous step is projected outward from the side of the bracket B through the side opening 80 of the wide hole 8a.

Next, the mounting hole 1 c is formed in the outer shell 1 from the inside of the sleeve 30. In the process, as shown in FIG. 10 (b), the hole drilling process is performed in a state where the opposite side surface of the sleeve 30 in the outer shell 1 is supported by the jig G. Then, after completion of the drilling process, the cylinder 12, the intermediate cylinder 11, the rod 2, the piston 20, the bottom member 14 and the like are assembled to the outer shell 1, and the damping force variable valve V is accommodated in the sleeve 30. Attach and complete the main unit D.

As described above, in the present embodiment, the protrusion 3 is completed in the process of assembling the main body D of the shock absorber A. However, the timing for assembling the projection 3 may be any time after welding the sleeve 30 to the outer shell 1.

Hereinafter, the effect of shock absorber A which is a cylinder device concerning this embodiment is explained.

In the present embodiment, the shock absorber (cylinder device) A includes the cylindrical outer shell 1, the protruding portion 3 provided on the side of the outer shell 1 and protruding radially outward, and the outer periphery of the outer shell 1. And a bracket B to be attached. Then, the bracket B embraces the outer periphery of the outer shell 1 and extends radially outward from both ends in the circumferential direction of the C-shaped cross section C-shaped section 4a having a crack 4a in the front part It has a pair of projecting

attachment parts

5 and 6.

Furthermore, in the bracket B of the present embodiment, a wide hole 8a is formed from the right side (one side) of the cylindrical portion 4 to the back to allow the insertion of the protrusion 3. Further, in the left side portion (the other side portion) of the cylindrical portion 4, a bridge portion 4b and a narrow hole 8b circumferentially divided from the wide hole 8a by the bridge portion 4b are formed.

According to the above configuration, the protrusion 3 can be made to protrude outward from the side portion of the cylindrical portion 4 or can be made to protrude outward from the back while inserting the protrusion 3 into the wide hole 8a. For this reason, even in the case where the projecting portion 3 is projected outward from the side portion of the cylindrical portion 4 when the shock absorber A is completed, the projecting portion 3 is out of the back of the cylindrical portion 4 in the projecting portion welding step. The mounting

portions

5 and 6 are directed to the side opposite to the projecting portion 3 by projecting them in the direction (FIGS. 9A and 9B).

In this way, the mounting

portions

5 and 6 do not disturb the welding even if the torch is moved or the outer shell 1 is rocked at the time of welding of the projecting portion 3. Therefore, according to the above configuration, even when projecting the projecting portion 3 outward from the side portion of the cylindrical portion 4 when the shock absorber A is completed, the welding operation of the projecting portion 3 can be facilitated, and the machine It is also easy to set the above and automatically perform the above welding.

The above-mentioned bracket B can be formed by bending a plate-like base material. And in order to make the above-mentioned composition, while forming the side holes 801 and 802 in the part which becomes the side part on either side in the base material respectively at the stage before bending, these and the bridge part between the side holes 801 and 802 A central hole 810 partitioned by 4b and 4c is formed. Then, after bending, one bridge portion 4c is cut off to connect the central hole 810 and one side hole 802 to form the wide hole 8a, and the other side hole 801 may be used as the narrow hole 8b. According to the method, the bracket B can be easily formed.

This is because, if the bracket B is formed by the above method, even if the bracket B at the time of completion is provided with the bridge portion 4b on only one side, in the bending process, it is possible to Since the

bridge portions

4b and 4b are provided, the difference in rigidity between the portions is reduced. Therefore, it is because the dimension after bending does not change with right and left easily, and shaping | molding of the bracket B by bending can be made easy.

Furthermore, even when cutting off a part of the cylindrical portion 4 after bending, only one bridge portion 4c is cut out, and the width (circumferential width) of the portion to be cut is small. Close to the plane. Therefore, punching processing using a press die becomes possible. For this reason, even if it is a case where one bridge part 4c is cut after bending, the said cut can be made easy.

Moreover, since the cylindrical part 4 can be reinforced with the bridge part 4b of the left one, it becomes advantageous in terms of strength. More specifically, when the vehicle travels, a force is applied to the shock absorber A to face in the front-rear direction of the vehicle body (front side / back side in FIG. 1). Furthermore, the left and right side portions of the cylindrical portion 4 are portions facing the front or the rear of the vehicle body in a state where the bracket B is attached to the vehicle, and when the force is input, the portions are loaded in the compression or tension direction It takes Therefore, when the bridge portion 4b is provided on one side of the cylindrical portion 4, compared to the case where the bridge portion 4b is not present (the wide hole 8a and the narrow hole 8b are continuous), compression and tension are obtained. And the durability is improved.

In addition, as described above, when forming the bracket B by cutting off one of the bridge portions (4b or 4c) after bending, it is possible to cut out the bridge portion even if it is cut out. If the protrusion 3 can be allowed to project from the side of the cylindrical portion 4 through the wide hole 8a, the bracket B can be used for the left wheel or the right wheel of the vehicle by selecting the bridge portion to be cut. For this reason, according to the above configuration, it is easy to make the bracket B compatible with the left wheel and the right wheel.

In the shock absorber A of the present embodiment, the projecting portion 3 is protruded from the right side portion of the cylindrical portion 4 and the bridge portion 4 b is provided on the left side portion of the cylindrical portion 4. However, while cutting off the bridge part 4b of the left side part and making the protrusion part 3 project from the left side part of the cylindrical part 4, the bridge part 4c may be provided in the right side part of the cylindrical part 4. Thus, the bracket B may be provided with the bridge portions 4b and 4c on either the left or right side.

Further, in the present embodiment, in a state where the front portion of the cylindrical portion 4 of the completed bracket B is directed to the front, the bridge portion 4b is formed with the center line X passing through the center of the cylindrical portion 4 in the axial direction Assuming that the bridge portion 4b and the virtual bridge portion of the line symmetry shape exist at the position of line symmetry (the bridge portion 4c on the cutting side remains), the shape of the bracket B is line symmetric with the center line X as the symmetry axis. It has a shape.

In the case where such a bracket B is formed by bending, as described above, at the stage before the bending, the bridge portions 4b and 4c are provided in portions which become the both sides of the cylindrical portion 4 in the base material. When cutting one bridge after bending, even if the shape of the bracket B is asymmetrical at the completion, the shape of the base material can be made symmetrical at the bending step, and at the time of completion The rigidity of the left and right side portions is substantially the same. Therefore, the left and right dimensions after bending are less likely to vary, and the forming of the bracket B by bending can be further facilitated.

Furthermore, in the case of manufacturing the bracket B by the above method, when the bracket B is connected to the wheel of the vehicle, the bracket B can be used for the left wheel and for the left wheel by selecting the bridge portions 4b and 4c to be cut off. It also becomes. For this reason, according to the above configuration, the bracket B can be more easily compatible with the left wheel and the right wheel. Furthermore, even in the case of manufacturing left and right brackets for left-right symmetrical shapes, if the bracket B is manufactured by the above-described method, the steps before the removal of the bridge portion can be made common, so both brackets It can be easily manufactured.

Moreover, in the present embodiment, the vertical width (axial length) of the back opening (portion located at the back of the cylindrical portion 4) 81 of the wide hole 8a is the side opening (one side of the cylindrical portion 4). Part) located longer than the vertical width of 80). According to this configuration, the distance from the protrusion 3 to the

edges

81a and 81b of the wide hole 8a can be made sufficiently long in the protrusion welding step. Therefore, the welding operation of the protrusion 3 can be further facilitated. Furthermore, even if the distance from the protrusion 3 to the edge of the hole 8 is sufficiently taken, the strength of the bracket B can be easily secured because the vertical width of the side opening 80 is short.

Further, in the present embodiment, the upper portion of the back opening 81 is continuous with the side opening 80, and the lower portion of the back opening 81 protrudes downward from the side opening 80. Then, in the projection welding step, the projection 3 is welded at a position higher than the position of the bracket B in the welded state (FIG. 7A), and before welding the bracket B to the outer shell 1, the bracket B is rotated in the circumferential direction and shifted downward in the axial direction (arrows Y1 and Y2 in FIGS. 7C and 7D).

According to the above configuration, in the completed shock absorber A, the protrusion 3 is protruded outward from the upper side of the bracket B, and the vertical width of the back opening 81 is sufficiently large. The distance from the edge 81a to the upper end of the cylindrical portion 4 is so short that the strength of the portion can be prevented from being insufficient.

Furthermore, as described above, when the force in the vehicle longitudinal direction is input to the shock absorber A, the stress in the vicinity of the upper bolt insertion hole 9a is particularly high in the bracket B. For this reason, if the projecting portion 3 is projected from the upper side portion of the cylindrical portion 4 close to the bolt insertion hole 9a, and if the wide hole 8a and the narrow hole 8b are continuous, the strength is likely to be disadvantageous. Therefore, in the bracket B in which the projecting portion 3 is projected outward from the upper side portion of the bracket B, the cylindrical portion 4 is reinforced by providing the bridge portion 4 b on the side opposite to the projecting side of the projecting portion 3 It is particularly effective.

In addition, the position of the protrusion part 3 can be suitably changed according to the periphery member of the buffer A in a vehicle. And according to the position of the said projection part 3, the position and shape of the wide hole 8a and the narrow hole 8b can also be changed suitably.

For example, in the case where the protrusion 3 is made to project from the lower side portion of the cylindrical portion 4, the shapes of the wide hole 8a and the narrow hole 8b may be upside down in FIG. When the protrusion 3 is made to project from the central side portion of the cylindrical portion 4, the upper and lower portions of the back opening 81 of the wide hole 8 a are vertically protruded from the side opening 80 and the narrow hole 8 b is formed as the side opening 80. It may be formed at the corresponding position. Furthermore, the vertical width of the wide hole 8a may be constant in the circumferential direction.

Moreover, although the protrusion part 3 of this Embodiment protrudes in the radial direction outer side from the side center of the bracket B in the state to which the bracket B was welded to the outer shell 1, the near side from the side center of the bracket B or It may be at a position shifted to the back side.

The wide hole 8 a allows the protrusion 3 to protrude outward from one side of the cylindrical portion 4 in a state in which the bracket B is welded to the outer shell 1, and the bracket B is welded to the outer shell 1. In the state before being carried out, any part of the wide hole 8a may be applied to the front and the other side of the cylindrical portion 4 as long as the protruding portion 3 can be protruded from the back of the cylindrical portion 4 It is also good. On the other hand, in order to make the bracket B correspond to the left and right wheels, the narrow hole 8b has the projection 3 on the other side of the cylindrical portion 4 in a state where the bracket B is welded to the outer shell 1 and the bridge portion 4b is removed. It is preferable that the size is such that it protrudes from the portion, and a part of the narrow hole 8 b may be in the front of the cylindrical portion 4.

And these changes are possible, even when bracket B equips bridge parts 4b and 4c in any side of right and left.

Further, in the present embodiment, the mounting hole 1 c is formed in the outer shell 1 after the protrusion welding step and the bracket welding step. According to this method, there is no concern that the dimensions of the mounting hole 1c will change after the mounting hole 1c is formed, under the influence of distortion due to welding. For this reason, even when the dimensional accuracy required for the mounting hole 1c is severe, it is easy to meet the requirement.

Furthermore, in the present embodiment, the wide hole 8a and the narrow hole 8b are respectively opened at positions at which the wide hole 8a and the narrow hole 8b are at least line symmetrical with respect to a straight line Z (FIG. 10B) axially passing through the center of the protrusion 3. Do. According to the configuration, as in the present embodiment, when the mounting hole 1 c is formed after welding the bracket B to the outer shell 1, the outer periphery of the outer shell 1 located directly behind the protrusion 3 is directly cured. It is supported by the tool G.

More specifically, in the present embodiment, a V-shaped groove is formed in the jig G, and as described above, the wide hole 8a and the narrow hole 8b are opened at positions where the straight line Z is in line symmetry. In this case, the jig G can contact the outer peripheral surface of the outer shell 1 while avoiding the bridge portion 4b. Since the outer peripheral shape of the outer shell 1 has small dimensional variation as compared with the outer peripheral shape of the bracket B, the dimensional accuracy of the mounting hole 1c can be made favorable if the outer shell 1 is directly supported by a jig G at the time of drilling. .

However, the range in which the wide hole 8a and the narrow hole 8b are formed, and the position of the bridge portion (4b or 4c) separating these can be changed as appropriate. For example, the bridge portions (4b, 4c) may not necessarily be directly behind the protrusion 3, but may be offset to the left or right of the straight line Z in FIG. 10 (b).

Moreover, the timing which forms the attachment hole 1c in the outer shell 1 is not said limitation, It can change suitably. For example, the mounting hole 1c may be formed before welding the bracket B. Further, in the present embodiment, the sleeve 30 is used for mounting the damping force variable valve V, and strict dimensional accuracy is required for the mounting hole 1c. However, as described above, the protrusion 3 may not necessarily include the damping force variable valve V. In such a case, the mounting hole 1c may not be necessary.

And these changes are possible, even when bracket B is provided with bridge parts 4b and 4c in either the right and left sides, and the position of projection part 3 and the position of wide hole 8a and narrow hole 8b are possible. And regardless of the shape.

While the preferred embodiments of the present invention have been described above in detail, modifications, variations and changes are possible without departing from the scope of the claims.

This application claims the priority based on Japanese Patent Application No. 2017-213415 filed with the Japan Patent Office on November 6, 2017, the entire contents of this application are incorporated herein by reference.

Claims

A cylinder device,
With a tubular outer shell,
A radially outwardly protruding protrusion provided on a side of the outer shell;
And a bracket attached to the outer periphery of the outer shell,
The bracket includes a cylindrical portion holding an outer periphery of the outer shell and having a C-shaped cross section divided at the front, and a pair of attachments protruding radially outward from both ends in the circumferential direction of the cylindrical portion. Have a department,
From one side of the cylindrical portion to the back, a wide hole is formed to allow the insertion of the protrusion;
The other side portion of the cylindrical portion is formed with a bridge portion and a narrow hole which is circumferentially partitioned by the bridge portion from the wide hole.
The cylinder device according to claim 1, wherein
An axial length of a portion of the wide hole located at the back of the cylindrical portion is longer than an axial length of a portion of the cylindrical portion located at the one side portion.
The cylinder device according to claim 1, wherein
In a state in which the front portion of the cylindrical portion is directed to the front, the bridge portion and the bridge portion are in a line symmetrical shape with a center line passing through the center of the cylindrical portion in the axial direction. Assuming that there is a virtual bridge part of
The shape of the said bracket is a line symmetry shape centering on the said center line as a symmetry axis. Cylinder apparatus.
The cylinder device according to claim 1, wherein
A cylinder device, wherein the wide hole and the narrow hole are respectively opened at positions symmetrical with respect to at least a straight line passing through a center of the protrusion in the axial direction as a symmetry axis.
A method of manufacturing a cylinder device,
The cylinder device is
With a tubular outer shell,
A radially outwardly protruding protrusion provided on a side of the outer shell;
And a bracket attached to the outer periphery of the outer shell,
The bracket includes a cylindrical portion holding an outer periphery of the outer shell and having a C-shaped cross section divided at the front, and a pair of attachments protruding radially outward from both ends in the circumferential direction of the cylindrical portion. And formed by bending a plate-like base material,
At the stage before the bending, side holes are respectively formed in portions which become one side portion and the other side portion of the cylindrical portion in the base material, and the bridge portion and the side hole are respectively formed between the side holes. There is a central hole separated by
After the bending, one of the bridge portions is cut off, and the central hole and one of the side holes are connected to form a wide hole, and the other side hole is formed into a narrow hole.