JP2006161883A - Shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piston position dependent a shock absorber having damping characteristic and capable of facilitating its mounting work. <P>SOLUTION: In a mounting method for this shock absorber for attaching the shock absorber provided with a bracket B1 at one end between a one side body A1 and the other side body A2, length of a clearance w between the body A1 on one side and the bracket B1 is adjusted after fixing the body A1 on one side and the bracket B1 temporarily, a first shim 20 and a second shim 25 which does not interfere with the first shim 20 are inserted between the body A1 and the bracket B1, and the body A1 on one side and the bracket B1 are nipped by a bolt B and a nut N while the first shim 20 and the second shim 25 are inserted between the body A1 and the bracket B1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a shock absorber mounting method and a shock absorber improvement.

  In general, a shock absorber attenuates vibrations acting on vehicles, equipment, and structures. For example, if a high damping force is generated at the stroke end, the shock absorber and the piston at the time of maximum expansion or compression If the impact from the interference with the cylinder end can be mitigated, or if it is interposed between column beams as a vibration control device that suppresses vibration of the structure, a high damping force is applied at the center of the stroke. It may be advantageous to generate a low damping force at the stroke end for the purpose of dissipating the elastic energy accumulated in the columns and beams.

  As described above, depending on the application of the shock absorber, the shock absorber may be optimized for the application by having a damping characteristic depending on the piston displacement, and various kinds of such shock absorbers have been developed.

  This type of shock absorber has, for example, a cylinder, a piston slidably inserted in the cylinder, two pressure chambers partitioned by the piston in the cylinder, a rod connected to the piston, and hydraulic oil 2 A damping valve that provides resistance to the flow of hydraulic oil when alternating between the two pressure chambers, a pair of grooves provided along the axial direction on the inner periphery of both ends of the cylinder, and a piston provided in the piston with a predetermined amount with respect to the cylinder When it is displaced, i.e., with a bypass port facing the groove in a predetermined stroke range, the bypass port faces the groove to form a bypass path when the predetermined stroke range is reached. The pressure chamber is communicated via a bypass formed by the groove and the bypass port.

  Therefore, according to this shock absorber, in the vicinity of the piston neutral position, the hydraulic oil exchanges the two pressure chambers only through the damping valve and generates a high damping force, but the piston is displaced with respect to the cylinder. When approaching the stroke end, the hydraulic oil exchanges the two pressure chambers not only through the damping valve but also through the bypass, so that the shock absorber generates a low damping force ( For example, see Patent Document 1).

On the other hand, there is also a type in which a groove is formed in the spool that penetrates the piston to form a bypass passage. In this shock absorber, a low damping force is generated near the neutral position of the piston, and a high damping force is generated near the stroke end (for example, Patent Document 2).
JP 2003-322193 A (from page 6, left column, line 6 to line 46, FIGS. 1 and 3) JP 2004-11733 A (from page 6, line 6 to line 10, page 1)

  However, the above-described conventional shock absorber does not have a functional problem, but has the following disadvantages.

  In this type of shock absorber, the piston displacement, that is, the generated damping force is changed within a predetermined stroke range. Therefore, when the shock absorber is attached to the vehicle, equipment, or structure to be applied, the piston is just It is necessary to set the neutral position to be the mounting length (hereinafter referred to as “reference mounting length”) arranged at the center of the cylinder.

  In other words, if the mounting length of the shock absorber does not become the reference mounting length, the neutral position of the piston when the shock absorber is mounted will sway from side to side with respect to the cylinder, and the stroke range will sway from side to side. Become.

  Then, for example, even in a scene where the shock absorber must generate a low damping force, it is impossible to generate a low damping force due to the above-mentioned shaking, and on the contrary, it is not within a predetermined stroke range. It is possible for a bypass path to be formed.

  Therefore, in the conventional shock absorber, as described above, it is necessary to strictly manage the mounting length, but there may be a dimensional tolerance or the like in the mounting portion of the vehicle or the like, and the mounting length as set is realized. May be difficult, and there is a risk that the mounting operation to the mounting site becomes very complicated.

  In addition, there are ball joints that are equipped with ball joints at both ends of the shock absorber, and the distance between the ball joints can be finely adjusted by rotating the cylinder or rod with respect to the ball joint sphere. For shock absorbers used for seismic isolation applications, the shock absorber itself is large and the mounting space is small, so the above fine adjustment cannot be performed with the shock absorber attached to the attachment site. Temporarily fix to the attachment site, measure the installation length, then remove the shock absorber from the attachment site, perform the above fine adjustment, and reattach the shock absorber to the attachment site. Therefore, the mounting work of the shock absorber was very inconvenient.

  Therefore, the present invention was devised in order to improve the above-described adverse effects, and the object of the present invention is to make it easy to install even a shock absorber whose damping characteristic depends on the piston position. is there.

  In order to achieve the above object, the present invention provides a shock absorber mounting method in which a shock absorber having a bracket at one end is mounted between one body and the other body. A first shim between the body and the bracket and a second shim that does not interfere with the first shim, and a first shim between the body and the bracket. The one body and the bracket are clamped with bolts and nuts while the second shim is inserted.

  The present invention also relates to a shock absorber mounting method in which a shock absorber having a bracket at one end is mounted between one body and the other body, and the one body and the bracket are connected between the one body and the bracket with a plurality of bolts and nuts. The distance between the two is adjustable and temporarily fixed and the other end of the shock absorber is fixed to the other body, and the adjustment screw that engages with the bracket after the temporary movement is advanced toward one body and adjusted. An adjustment process in which the tip of the screw is brought into contact with one body to adjust the gap between the one body and the bracket, and one or more bolts are provided between the one body and the bracket after the adjustment process so as not to interfere with the adjustment screw The bolts and nuts are removed so that the first shim of the first shim can be inserted from one of the brackets, and a first shim insertion step for inserting the first shim, and a first shim insertion step after the first shim insertion step Taken during the shim insertion process A first clamping process for clamping the one body, the first shim and the bracket with the removed bolt and nut, and a bolt insertion hole between the one body and the bracket after the first clamping process, and an adjusting screw and the first screw The bolts and nuts that were not removed during the first shim insertion step are removed so that one or more second shims that do not interfere with the shim can be inserted from the other of the brackets, and the second shim is inserted. A shim insertion stroke and a second clamping stroke in which the one body, the shim, and the bracket are clamped by the bolts and nuts removed in the second shim insertion stroke after the second shim insertion stroke.

  Further, according to the present invention, in the shock absorber having a bracket that can be attached to the attachment part at one end, an adjustment screw that abuts the attachment part and creates a predetermined gap between the bracket and the attachment part is screwed. A screw hole is provided.

  According to the shock absorber mounting method of the present invention, unlike the conventional shock absorber mounting method, the shock absorber is not once removed after being attached to the mounting portion.

  Therefore, even when the shock absorber is large or when the mounting space is small, the adjustment work can be completed with the shock absorber attached to the attachment site, and the position adjustment work becomes very easy. .

  Also, unlike the conventional shock absorber mounting method, the shock absorber itself does not need to be rotated, and a large space is not required for the mounting operation. Therefore, the mounting operation can be performed sufficiently even when the mounting space is small.

  Therefore, the burden on the worker who installs the shock absorber is greatly reduced.

  Furthermore, according to the shock absorber of the present invention, when attaching to the attachment site, unlike the conventional shock absorber, the shock absorber is not once removed after being attached to the attachment site.

  Therefore, even when the shock absorber is large or when the mounting space is small, the adjustment work can be completed with the shock absorber attached to the attachment site, and the position adjustment work becomes very easy. .

  Further, it is not necessary to rotate the shock absorber itself as in the case of a conventional shock absorber, and a large space is not required for the mounting operation, so that the mounting operation can be performed sufficiently even when the mounting space is small.

  Therefore, the burden on the worker who installs the shock absorber is greatly reduced.

  The present invention will be described below based on the illustrated embodiment. FIG. 1 is a side view showing a state in which a shock absorber according to an embodiment is attached between one body and the other body, which are attachment parts. FIG. 2 is a plan view showing a state in which the shock absorber in one embodiment is attached between one body and the other body which are attachment parts. FIG. 3 is a left side view of the ball joint as a bracket. FIG. 4 is a left side view of the first shim and the second shim. FIG. 5 is a side view illustrating a state in which the shock absorber according to the embodiment is temporarily fixed between the one body and the other body which are attachment portions. FIG. 6 is a diagram showing an adjustment process for adjusting the length of the gap between the bracket and the one body of the shock absorber according to the embodiment. FIG. 7 is a partially enlarged view of the shock absorber in a state in which the adjusting screw is screwed to the bracket. FIG. 8 is a view showing a state in which the first shim is inserted between the bracket and the one body.

  As shown in FIG. 1 and FIG. 2, the shock absorber according to the embodiment includes a cylinder 2, a rod 3 inserted through the cylinder 2 so as to be able to protrude and retract, and a cylinder 4 extending from the end of the cylinder 2. The shock absorber body 1 provided, the ball joint B1 which is a bracket provided at the left end of the cylinder 4 in the drawing, the ball joint B2 provided at the end of the rod 3, and the one body A1 which is the ball joint B1 and the attachment site The first shim 20 and the second shim 25 are inserted between the first shim 20 and the second shim 25.

  Although not shown in detail, the shock absorber main body 1 is slidably inserted into the cylinder 2 and is partitioned by a piston (not shown) connected to the rod 3 and the piston 2 in the cylinder 2. Constructed as a shock absorber with two pressure chambers (not shown) and a damping characteristic depending on the position of a double rod type piston provided with grooves (not shown) provided on the left and right ends of the inner periphery of the cylinder 2 In this case, when the piston moves in the left-right direction with respect to the cylinder 2 and is displaced to the vicinity of the stroke end, the two pressure chambers communicate with each other through the groove, and the damping force is near the stroke end. Is to be reduced.

  As shown in FIGS. 1 and 3, the ball joint B <b> 1 as a bracket extends from the base 6, a sphere 6 connected to a shaft 5 provided at the end of the tube 4, a plate-like base 7. And a holding portion 8 for holding the sphere 6. The base portion 7 is provided with bolt insertion holes 9 a, 9 b, 9 c, 9 d at the four corners, and two screws up and down in FIG. 3. Holes 10a and 10b are provided.

  The ball joint B2 has substantially the same configuration as the ball joint B2. However, the base 7 of the ball joint B2 is not provided with screw holes 10a and 10b, and the sphere 6 is the end of the rod 3. It is connected to the part.

  On the other hand, the one body A1 and the other body A2, which are attachment parts, are formed in a plate shape in the drawing and correspond to the bolt insertion holes 9a, 9b, 9c, 9d formed in the ball joints B1, B2. Four bolt insertion holes 11 are provided at each position.

  As shown in FIG. 4, the first shim 20 includes a shim main body 21 formed in a plate shape with a predetermined thickness, and two bolt insertion holes formed in the shim main body 21 at the upper left and lower sides in the drawing. 22a and 22b, and two grooves 23a and 23b formed by cutting the shim main body 21 in a circular arc shape in the upper right and lower sides in the figure.

  As shown in FIG. 4, the other second shim 25 includes a shim main body 26 formed in a plate shape with a predetermined thickness, and two bolt insertion holes drilled vertically on the right side of the shim main body 26 in the figure. 27a and 27b, and two grooves 28a and 28b formed by cutting the shim body 26 in the shape of an arc in the upper right and lower sides in the figure.

  Thus, by making the shape of the 1st shim 20 and the 2nd shim 25 into the same shape, manufacture of a shim becomes easy and the manufacturing cost is also reduced.

  That is, the first shim 20 and the second shim 25 are formed in the same shape, and when these two are arranged side by side, bolt insertion holes 9a, 9b, 9c, 9d formed in the base portion 7 of the ball joint B1. The bolt insertion holes 22a and 22b and the bolt insertion holes 27a and 27b are opposed to each other, and the circular opening formed by the grooves 23a and 23b and the grooves 28a and 28b is formed on the base 7. The screw holes 10a and 10b provided are opposed to each other.

  Next, a method of attaching the thus configured shock absorber to the one body A1 and the other body A2 that are attachment parts will be described.

  First, as shown in FIG. 5, while maintaining the shock absorber in a compressed state, the shock absorber is inserted between the one body A1 and the other body A2, and then viewed from the shock absorber D of the one body A1 and the other body A2. Four bolts B are respectively inserted into the bolt insertion holes 11 and the bolt insertion holes 9a, 9b, 9c, 9d of the ball joints B1, B2 from the back side, and nuts N are screwed onto the respective bolts B.

  At this time, on the other body A2 side, the bolt B and the nut N are tightened with a predetermined tightening torque, and the other body A2 and the ball joint B2 are sandwiched and fixed by the bolt B and the nut N.

  On the other hand, on the one body A1 side, the one body A1 and the ball joint B1 are sandwiched by bolts B and nuts N so that a gap W is formed between the one body A1 and the ball joint B1. B1 is temporarily fixed and the temporary stop process is terminated.

  That is, the distance between the left end of the bolt B and the right end of the nut N is longer than the length of the one body A1 in the horizontal direction in the drawing plus the horizontal width in the drawing of the base 7 of the ball joint B1.

  Subsequently, the process proceeds to an adjustment process, and as shown in FIGS. 6 and 7, the adjustment screws 12 and 12 are respectively screwed into the screw holes 10a and 10b provided in the base portion 7 of the ball joint B1 from the shock absorber body 1 side. To do.

  Then, the adjusting screws 12 and 12 are rotated with respect to the screw holes 10a and 10b, respectively, and advanced toward the one body A1, and the one body A1 and the ball joint B1 Adjust the length of the gap W between the two.

  At this time, the distance L between the end of the cylinder 2 of the shock absorber and the mark 13 provided on the rod 3 at the reference mounting length is measured in advance, and the length of the gap W is adjusted by the adjusting screws 12 and 12. When adjusting the length, the length of the gap W is adjusted so that the distance between the cylinder 2 and the mark 13 provided on the rod 3 becomes the length L measured in advance.

  Thus, by grasping the length L of the distance between the mark 13 and the end of the cylinder 2, it is easy to realize the adjustment operation of the gap W, that is, the reference mounting length of the shock absorber.

  In the figure, the mark 13 is used as a joint between the rod 3 and the ball joint B2. However, the mark 13 may be provided as a mark by coloring another portion of the rod 3 or by providing a notch.

  Then, after adjusting the length of the gap W between the one body A1 and the ball joint B1 to be a predetermined length by the adjusting screws 12 and 12 in this way, the left side of the bracket B1 in FIG. The nut N is removed from the bolt B inserted into the two upper and lower bolt insertion holes 9a, 9b, and the bolt B inserted into the bolt insertion holes 9a, 9b is removed.

  After that, the first shim 20 is inserted into the gap W between the one body A1 and the ball joint B1 from the front side in FIG. At this time, since the first shim 20 is provided with grooves 23a and 23b, the bolt insertion holes 22a and 22b face the bolt insertion holes 9a and 9b of the base 7 without interfering with the adjusting screws 12 and 12b. Can be inserted smoothly until

  Although only one first shim 20 can be inserted, in the present embodiment, as shown in FIG. 1, the length of the gap W is measured during the adjustment process, and two sheets of the first shim 20 are inserted. The first shims 20 are stacked and inserted into the gap W so that the thickness (thickness in the left-right direction in FIG. 1) is substantially the same length as the gap W.

  If a plurality of first shims 20 having different thicknesses are prepared, the total thickness of the first shims 20 combined by the combination of the plurality of first shims 20 is made substantially the same as the length of the gap W. It becomes easy.

  After the insertion of the first shim 20, the bolt insertion holes 9a and 9b of the base 7, the bolt insertion holes 22a and 22b of the first shim 20, and the bolt insertion hole 11 of the one body A1 are again shown in FIG. The bolt B removed at the time of insertion of the first shim 20 is inserted into the bolt B, and the nut N is screwed to the bolt B with a predetermined tightening torque. And the ball joint B1 is clamped and fixed.

  Further, this time, the nut N is removed from the bolt B inserted into the two bolt insertion holes 9c, 9d on the right and left in the bracket B1 in FIG. 3, and the bolt B inserted into the bolt insertion holes 9c, 9d is removed.

  After that, the second shim 25 is inserted into the gap W between the one body A1 and the ball joint B1 from the back side in FIG. At this time, the second shim 25 is provided with grooves 28a and 28b so as not to interfere with the adjusting screws 12 and 12b, and the shapes of the left side surfaces of the second shim 25 and the first shim 20 are the same. Since the base 7 has a half shape, it does not interfere with the first shim 20. Therefore, the second shim 25 can be smoothly inserted into the gap W between the one body A1 and the ball joint B1 until the bolt insertion holes 27a and 27b face the bolt insertion holes 9c and 9d of the base portion 7. it can.

Also, since the second shim 25 does not interfere with the first shim 20,
In addition, the 2nd shim 25 is also piled up similarly to the 1st shim 20, and as shown in FIG. 2, it is set as the length of the said clearance gap W measured at the time of an adjustment process. It is inserted in the gap W.

  After the insertion of the second shim 25, as shown in FIG. 1 again, the bolt insertion holes 9c and 9d of the base 7, the bolt insertion holes 27a and 27b of the second shim 25, and the bolt insertion hole 11 of the one body A1. The bolt B removed at the time of inserting the second shim 25 is inserted into the bolt B, the nut N is screwed to the bolt B with a predetermined tightening torque, and the one body A1 and the second shim 25 are connected with the bolt B and the nut N. And the ball joint B1 is clamped and fixed, and the mounting operation of the shock absorber is completed.

  That is, in this shock absorber and the shock absorber mounting method, unlike the conventional shock absorber and shock absorber mounting method, the shock absorber is not once removed from the mounting portion after being attached.

  Therefore, even when the shock absorber is large or when the mounting space is small, the adjustment work can be completed with the shock absorber attached to the attachment site, and the position adjustment work becomes very easy. .

  In addition, in this shock absorber and shock absorber mounting method, it is not necessary to rotate the shock absorber itself as in the conventional shock absorber and shock absorber mounting method, and a large space is not required for mounting work. Even when the width is narrow, the mounting operation can be performed sufficiently.

  Therefore, the burden on the worker who installs the shock absorber is greatly reduced.

  In the present embodiment, the present invention is described on the assumption that the shock absorber is used as a vibration damping device for a structure, but the shock absorber of the present invention is a vehicle, It can be used for equipment and the like, and the mounting method is the same.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a side view which shows the state which attached the shock absorber in one Embodiment between the one body which is an attachment part, and the other body. It is a top view which shows the state which attached the shock absorber in one Embodiment between the one body which is an attachment part, and the other body. It is a left view of the ball joint which is a bracket. It is a left view of the 1st shim and the 2nd shim. It is a side view which shows the state which temporarily fixed the shock absorber in one Embodiment between the one body and the other body which are attachment parts. It is a figure which shows the adjustment process which adjusts the length of the clearance gap between the bracket of the buffer and one body in one Embodiment. It is the elements on larger scale of the shock absorber in the state which screwed the adjustment screw in the bracket. It is a figure which shows the state which inserted the 1st shim between the bracket and the one body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shock absorber body 2 Cylinder 3 Rod 4 Tube 5 Shaft 6 Sphere 7 Base 8 Holding part 9a, 9b, 9c, 9d, 22a, 22b, 27a, 27b, 11 Bolt insertion hole 10a, 10b Screw hole 12 Adjustment screw 13 Mark 20 1st shim 21 and 26 Shim main body 23a, 23b, 28a, 28b Groove 25 2nd shim A1 One body A2 which is an attachment part The other body B1 which is an attachment part Ball joint B2 which is a bracket B2 Ball joint

Claims (7)

In the mounting method of the shock absorber in which a shock absorber having a bracket at one end is mounted between one body and the other body, the gap between the one body and the bracket is adjusted after temporarily tightening the one body and the bracket, The first shim and the second shim that does not interfere with the first shim are inserted between the brackets, and the one body and the bracket are inserted while the first shim and the second shim are inserted between the one body and the bracket. A shock absorber mounting method characterized by sandwiching a bolt with a bolt and a nut. In the mounting method of a shock absorber that attaches a shock absorber with a bracket at one end between one body and the other body, the distance between the one body and the bracket can be adjusted with multiple bolts and nuts between the one body and the bracket Temporarily hold and temporarily fix and fix the other end of the shock absorber to the other body, and the adjusting screw that engages with the bracket after the temporary stopping process is advanced in one body direction, and the tip of the adjusting screw is moved to the one body An adjustment process for adjusting the gap between the one body and the bracket by contacting the one body and the bracket, and one or more first shims that have a bolt insertion hole between the one body and the bracket after the adjustment process and do not interfere with the adjustment screw. Some bolts and nuts were removed so that they could be inserted from one side of the bracket, and the first shim insertion step for inserting the first shim was removed in the first shim insertion step after the first shim insertion step. With bolts A first clamping process for clamping the one body, the first shim, and the bracket with the bracket, and a bolt insertion hole between the one body and the bracket after the first clamping process to interfere with the adjusting screw and the first shim. A second shim insertion step in which the bolts and nuts that were not removed during the first shim insertion step are removed and the second shim is inserted so that one or more second shims can be inserted from the other of the brackets. And a second clamping step of clamping the one body, shim and bracket with the bolts and nuts removed in the second shim insertion step after the second shim insertion step. 3. The shock absorber mounting method according to claim 1, wherein the gap is adjusted based on a mark provided on the cylinder end and the rod of the shock absorber. 4. The shock absorber mounting method according to claim 1, wherein the first shim and the second shim have the same shape. The shock absorber having a bracket that can be attached to the attachment part at one end has a screw hole into which the adjusting screw that abuts the attachment part and creates a predetermined gap between the bracket and the attachment part is screwed. A shock absorber characterized. A first shim inserted between the bracket and the mounting portion and not interfering with the adjusting screw; and a second shim inserted between the bracket and the mounting portion and not interfering with the adjusting screw and the second shim. The shock absorber according to claim 5. The shock absorber according to claim 6, wherein the first shim and the second shim have the same shape.

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