shock absorbers

Abstract

A shock absorber is provided to simplify the insertion / fastening process. The shock absorber comprises a spring force application unit (84) for applying a force in a valve closing direction to the disc valve while allowing the attached stem to be inserted through the spring force application units (53–58), and a cylindrical element to allow the attached stem (21) to be inserted through it, the cylindrical element being inserted into each of the valve discs (53–58) and the spring force application unit (84), in which: the cylindrical element (47) is provided to have a radially extending gap on an inner side of the inner seat (31) of the valve main body (14).

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a shock absorber.

[0002] A shock absorber comprises a disc valve that opens and closes a line through which an operating fluid flows by means of the movement of a piston. In the aforementioned shock absorber, the disc valve is pre-tensioned by a spring device (see, for example, Japanese patent application publication no. 57-137735 A). SUMMARY OF THE INVENTION

[0003] In the shock absorber described above, the assembly (insertion / attachment) of a component for pre-tensioning the disc valve in one valve closing direction is complicated.

[0004] In view of the problem mentioned above, it is an object of the present invention to provide a shock absorber that simplifies the assembly process.

[0005] To achieve the aforementioned objective, the present invention comprises a structure comprising: a spring force application device for applying a force in a valve closing direction to the disc valve, while enabling the attached stem to be inserted through the spring force application device; and a cylindrical element to allow the attached stem to be inserted through the cylindrical element, wherein the cylindrical element is inserted into both the disc valve and the spring force application device, wherein: the cylindrical element is provided to have a radially extending gap on an inner side of the inner seat of the valve main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The enclosed drawings show:

[0007] Fig. 1 a sectional view showing a main section of a shock absorber according to an embodiment of the present invention;

[0008] Fig. 2 a side view showing a cylindrical element of the shock absorber according to the embodiment of the present invention;

[0009] Fig. 3 a top view showing one of the valve discs of the damper according to the embodiment of the present invention;

[0010] Fig. 4 a partially enlarged view showing the cylindrical element and the disc valves of the shock absorber according to the embodiment of the present invention, which are partially shown in cross-section;

[0011] Fig. 5 a sectional view showing a state of the shock absorber according to the embodiment of the present invention at the time of attachment / insertion; and

[0012] Fig. Figure 6 is another sectional view showing a state of the shock absorber according to the embodiment of the present invention at the time of attachment / insertion. DETAILED DESCRIPTION OF THE INVENTION

[0013] In the following, an embodiment of the present invention is described with reference to the accompanying drawings.

[0014] A shock absorber of this design is a so-called hydraulic monotube shock absorber, as in Fig. 1 shown. The shock absorber comprises a cylinder. 10 with an approximately cylindrical shape, in which an oil fluid corresponding to an operating fluid is enclosed. A piston 11 is movable within the cylinder 10 introduced. The interior of the cylinder 10 is done by means of the piston 11 divided into two chambers, i.e. an upper chamber 12 and a lower chamber 13 .

[0015] The piston11 includes a piston main body (valve main body) 14 with an approximately disc-like shape and a ring-shaped sliding element 15 The sliding element 15 is located on an outer circumferential surface of the piston main body 14 arranged. The piston main body 14 is with one end of a piston rod 16 connected. The other end of the piston rod 16 extends from the cylinder 10 (not shown).

[0016] The piston rod 16 includes a main shaft section 20 , an inserted shaft section (attached shaft) 21 , and a threaded shaft section 22 The inserted shaft section 21 It has a smaller diameter than that of the main shaft. 20 and is located at one end of the main shaft section 20 on the side where the piston 11is attached, provided for. The threaded shaft section 22 is on the side of the inserted shaft section 21 provided, which is opposite the side where the main shaft section 20 is planned.

[0017] In the center of the piston body 14 is an insertion hole (valve body insertion hole) 23 , through which the inserted shaft section 21 the piston rod 16 to be inserted, designed to pass axially through the piston main body 14 to run. A concave housing section 24 having a larger inner diameter than the diameter of the insertion hole 23 , which is concave axially towards an intermediate position, is located at an axial end of the piston main body 14 formed. The concave housing section 24 is on the inside of a ring-shaped wall section 25formed, which is coaxial to the insertion hole 23 extends. The insertion of the inserted shaft section. 21 into the through hole 23 positions the piston main body 14 radial in relation to the piston rod 16 .

[0018] A large number of lines 26 (hereinafter referred to as "pipe", "inner pipe" or "exit side pipe") is through the piston main body 14 through the radially outer side of the insertion hole 23 within the concave housing section 24 trained. In Fig. Only one of them is shown due to cross-sectional limitations. The inner conduit 26 connects the upper chamber 12 and the lower chamber 13 , to allow the oil fluid from the upper chamber 12 to the lower chamber 13 , during the sliding movement of the piston 11to flow towards the upper chamber, i.e., during an extension stroke. Furthermore, a multitude of lines... 27 (hereinafter referred to as "conduit", "outer conduit" or "displacement side conduit") through the piston main body 14 through on the radially outer side of the inner conduit 26 within the concave housing section 24 trained. In Fig. Only one of them is shown due to cross-sectional limitations. The outer line 27 connects the upper chamber 12 and the lower chamber 13 , to allow the oil fluid from the lower chamber 13 towards the upper chamber 12 , during the sliding movement of the piston 11 towards the lower chamber 13 , to flow, i.e. during a displacement stroke.

[0019] A damping force generation mechanism 28To generate a damping force, a damping force is applied to the inner conductors. 26 provided. The damping force generation mechanism 28 is on the side of the piston 11 provided for, which are located near the lower chamber 13 in the axial direction. The inner lines 26 They form extension side lines through which the oil fluid flows when the piston moves. 11 moved towards the exit side, towards which the piston rod 16 emerging from the cylinder 11 extends outwards. The damping force generation mechanism 28 , which is connected to the exit side lines 26 The system includes an exit side damping force generation mechanism that regulates the flow of oil fluid through the displacement side lines. 26 controls to generate the damping force.

[0020] A damping force generation mechanism 29 To generate a damping force, a damping force is applied to the outer lines.27 provided. The damping force generation mechanism 29 is on the side of the piston 11 provided for, which are located close to the upper chamber 12 located in the axial direction. The outer line 27 features displacement side channels through which the oil fluid flows when the piston moves 11 towards the displacement side, where the piston rod 16 into the cylinder 10 moves. The damping force generation mechanism 29 , which is on the displacement side lines 27 The system includes a displacement side damping force generation mechanism that reduces the flow of oil fluid through the displacement side lines. 27 controls to generate the damping force.

[0021] An inner seat 31 , which is the aforementioned damping force generation mechanism 28 forms, is located on the concave housing section 24of the piston main body 14 trained. The inner seat 31 is on the radially inner side of open ends of the exit side lines 26 provided for, with the open ends on the lower side of the chamber 13 are arranged. The inner seat 31 is designed to move in the axial direction of the piston main body 14 to stand out. The inner seat 31 is designed to form a ring-like shape around the insertion hole 23 to exhibit, more specifically, a ring-shaped form with the insertion hole 23 as a center. The inner seat 31 extends in the axial direction of the piston main body 14 , in order to maintain a predetermined height across the entire perimeter.

[0022] Furthermore, an outer seat 32 , which is the damping force mechanism mentioned above 28 forms, also on the concave housing section 24 of the piston main body14 The outer seat is located on the radially outer side of the open ends of the exit side lines. 26 provided for, with the open ends on the lower side of the chamber 13 are arranged. The outer seat 32 is designed to align itself in the axial direction of the piston main body 14 to extend the outer seat 32 has a larger diameter than that of the inner seat 31 and is designed to form a ring-like shape on the outer circumferential side of the inner seat 31 to show all the openings of the multitude of pipes 26 to surround the exit side. Specifically, the outer seat 32 shaped to form a ring shape with the insertion hole 23 to occupy a center. It should be noted that the outer seat 32It may also have a different ring-shaped form than the ring-shaped form, for example a petal-like pattern with a large diameter section and a small diameter section arranged alternately, an elliptical shape, or the like.

[0023] The outer seat 32 extends in the axial direction of the piston main body 14 , in order to assume a predetermined height across the entire circumference. The outer seat 32 exhibits a greater height in the axial direction towards the lower chamber 13 than those of the inner seat 31 on. The axial projections of the inner seat 31 and the outer seat 32 form a ring-shaped concave section 33 from which has a ring-shaped form extending in the axial direction of the piston main body 14 between the inner seat 31 and the outer seat 32It is concave. Additionally, there is a ring-shaped concave section. 34 with a ring-shaped form that extends in the axial direction of the piston main body 14 concave, between the outer seat 32 and the ring-shaped wall section 25 trained. The open ends of the exit side lines 26 in the lower chamber 13 are open on a ground surface of the ring-shaped concave section 33 , which is formed on the inner side, whereas the open ends of the displacement side lines 27 on the lower side of the chamber 13 on a bottom surface of the ring-shaped concave section 34 , which is located on the outer side, are open.

[0024] A concave landing section 35 , which is in the axial direction of the piston main body 14 It is concave, it is on the concave housing section 24 of the piston main body 14trained. This concave docking section 35 is on the radially outer side of the insertion hole 23 and on the radially inner side of the inner seat 31 arranged, i.e., on the side of the inner seat 31 , radially close to the insertion hole 23 is. The concave landing section 35 is on the inner side of the inner seat 31 designed to have a ring-like shape, in particular having the insertion hole in a ring-shaped form 23 as the center. The ring-shaped concave section 33 is to the upper side of the chamber 12 concave to have a greater depth than the ring-shaped concave section 34 in the axial direction of the piston main body 14 and the concave landing section 35 is towards the upper side of the chamber 12 concave to achieve an even greater depth than that of the ring-shaped concave section. 33in the axial direction of the piston main body 14 to demonstrate.

[0025] A mounting seat 40 is at one end of the piston main body 14 formed, which is located on the upper side of the chamber 12 is located. The mounting seat 40 is designed to align itself in the axial direction of the piston main body 14 on the radially outer side of the insertion hole 23 to extend. The mounting seat 40 is designed to form a ring shape with the insertion hole 23 to have a center and extends in the axial direction of the piston main body. 14 , in order to maintain a predetermined height across the entire perimeter.

[0026] An inner seat 41 , which is the aforementioned damping force generation mechanism 29 forms at the end of the piston main body 14 formed, which is located on the upper side of the chamber 12 is located. The inner seat41 is formed on the radially outer side of the mounting seat 40 and the radially inner side of the open ends of the compression side lines 27 , with the open ends close to the upper chamber 12 are to align themselves in the axial direction of the piston main body 14 to extend. The inner seat 41 has a larger diameter than that of the mounting seat 40 and is designed to form a ring-shaped opening around the insertion hole 23 , in particular a ring-shaped form with the insertion hole 23 to occupy a center. The inner seat 41 extends in the axial direction of the piston main body 14 , in order to maintain a predetermined height across the entire perimeter.

[0027] Furthermore, an outer seat 42 , which is the aforementioned damping force generation mechanism 29 forms at the end of the piston main body 14formed, which is located on the upper side of the chamber 12 is located. The outer seat 42 is on the radially outer side of the open ends of the compression side lines 27 formed, with the open ends located close to the upper chamber 12 are located in the axial direction of the piston main body 14 to extend the outer seat 42 has a larger diameter than that of the inner seat 41 and is designed to form a ring-like shape on the outer circumferential side of the inner seat 41 to occupy all openings of the multitude of compression side lines 27 to enclose, in particular a ring-shaped form with the insertion hole 23 as a center. It should be noted that the outer seat 42a ring-shaped form other than the ring-shaped or circular form, for example a petal-like shape with a section of larger diameter and a section of smaller diameter arranged alternately, an elliptical shape or the like.

[0028] In the axial direction of the piston main body 14 the mounting seat 40 , the inner seat 41 and the outer seat 42 down to the same level. The protrusions of the mounting seat. 40 , of the inner seat 41 and the outer seat 42 form in the axial direction of the piston main body 14 a ring-shaped concave section 43 and a ring-shaped concave section 44 The ring-shaped concave section 43 has a ring-shaped form that extends in the axial direction of the piston main body 14 towards the lower chamber 13is concave and the area between the mounting point 42 and the inner seat 41 is formed, whereas the ring-shaped concave section 44 a ring-shaped form that extends in the axial direction of the piston main body 14 towards the lower chamber 13 is shaped and between the inner seat and the outer seat 42 is designed, exhibits. The open ends of the exit side lines 26 on the upper side of the chamber 12 are located on a bottom surface of the inner ring-shaped concave section 43 open, whereas the open ends of the displacement side lines 27 on the upper side of the chamber 12 on a bottom surface of the outer ring-shaped concave section 44 are open. It should be noted that a large number of guide grooves (not shown) run in the axial direction of the piston body. 14 towards the lower chamber 13are concave at the outer seat 42 , in order to run radially through it, are formed. The outer seat 42 extends in the axial direction of the piston main body 14 towards the upper chamber 12 , in order to assume a predetermined height up to the conductor grooves.

[0029] A cylindrical element 47 is on the lower side of the chamber 13 of the piston main body 14 trained to fit the inserted shaft section 21 the piston rod 16 to allow it to be inserted. The insertion of the inserted shaft section. 21 through the cylindrical element 47 positions the cylindrical element 47 radial in relation to the piston rod 16 Radial, concave engagement grooves 48 are located on an outer circumferential section of the cylindrical element 47 at two circumferential ends of the cylindrical element 47formed in the axial direction, so that each of the engagement grooves 48 in a ring-shaped form coaxial to the cylindrical element 47 is formed. One result is a ring-shaped flange section. 49 , which projects radially outwards, on the cylindrical element 47 designed to be located on the axially outer side of each of the engagement grooves 48 , located at the two circumferential ends of the cylindrical element 47 are trained, to be trained. Between the two engagement grooves 48 is a ring-shaped sliding motion guide section (large diameter section) 50 with a larger diameter than that of each of the engagement grooves 48 Formed. Cylindrical outer circumferential surfaces of the two flange sections. 49 and the sliding motion guidance section 50 They have the same diameter. Additionally, the two engagement grooves have... 48the same diameter. The flange section 49 They can be formed intermittently in the circumferential direction, instead of being formed continuously in the circumferential direction in a ring-shaped form.

[0030] As in Fig. As shown in Figure 2, each of the engagement grooves includes 48 a grooved floor surface 48a , an inclined surface 48b and a curved surface 48c The grooved floor surface 48a It has a cylindrical surface shape. The inclined surface 48b is on the side of the grooved floor surface 48a formed, which are located close to the sliding motion guidance section 50 is formed and connects the grooved floor surface 48a and an outer circumferential surface of the sliding motion guide section 50 together. The curved surface 48c is on the side of the groove floor surface 48aformed opposite the side where the sliding motion guide section is located. 50 is formed, is and connects the grooved floor surface 48a and the outer circumferential surface of one of the flange sections 49 , which are adjacent to each other. The inclined surface 48b on the sliding motion guide section side 50 is slightly inclined.

[0031] As in Fig. As shown in Figure 1, each of the flange sections has 49 a smaller diameter than an inner diameter of an inner circumferential surface of the concave contact section 35 of the piston main body 14 Therefore, the cylindrical element moves 47 into the concave landing section 35 of the piston main body 14 , in order to be on the bottom surface of the concave landing section 35 to be concerned. Specifically, the cylindrical element 47with a radially extending gap on the inner side of the inner seat 31 provided with the circumferential wall surface of the concave attachment section 35 of the piston main body 14 forms. The cylindrical element 47 and the piston body 14 are radially through the inserted shaft section 21 positioned. As a result, the gap between the cylindrical element is 47 and the circumferential wall surface of the concave attachment section 35 over the entire circumference of the cylindrical element 47 continuous. In other words, the cylindrical element exhibits 47 a free space to allow free movement of the cylindrical element 47 in the radial direction with respect to the concave attachment section 35 to enable the formation of one of the intervention grooves. 48 and from one of the flange sections 49on the outer circumference of the cylindrical element 47 on the piston main body side 14 , which corresponds to one side in the axial direction, is sufficient. In this embodiment, however, another pair of the engagement section is used. 48 and the flange section 49 (second flange section) on the cylindrical element 47 formed on the opposite side in the axial direction to prevent the limitation of the alignment at the time of insertion / attachment, in order to improve operability during insertion / attachment.

[0032] An axial length of each of the flange sections 49 is less than the axial depth of the concave attachment section 35 Therefore, the curved section 48c from each of the intervention grooves 48 , which in Fig. 2 are shown, closer to the piston main body 14 in the axial direction as the inner seat 31, who in Fig. As shown in 1, it is positioned. Specifically, the grooved floor surface is positioned. 48a the upper of the engagement grooves 48 , which in Fig. 1 are shown, axial to a distal end surface of the inner seat 31 aligned. Furthermore, a distal end surface of the outer seat is 32 axially with respect to the groove bottom surface 48a the upper of the engagement grooves 48 , which in Fig. 1 are shown, aligned.

[0033] The damping force generation mechanism 28 includes a disc valve that is simultaneously attached to the inner seat 31 and the outer seat 32 can be seated. In this embodiment, the disc valve comprises a plurality of valve discs. 53 until 58 , each of which has a ring shape. The damping force generation mechanism 28 It also includes a ring-shaped spacer. 60and a ring-shaped movable spring locking element 61 , a feather 62 and a fixed spring locking element 63 The ring-shaped spacer 60 is on the side of the valve discs 53 until 58 provided, which are opposite the side on which the piston main body is located 14 is arranged, is located. The movable spring locking element 61 is on the side of the spacer 60 provided, which are opposite the side on which the piston main body is located 14 is arranged, is located. The spring 62 is located on the side of the movable spring locking element 61 provided, which is opposite the side on which the piston main body is located 14 is located. The attached spring-loaded locking element 63 is on the side of the spring 62 provided, which is opposite the side on which the piston main body is located 14is located.

[0034] The valve disc 53 , which in the axial direction is the next of all the valve discs 53 until 58 to the valve body 14 is and which is in contact with the inner seat 31 and the outer seat 32 It can come and be separated from these, and has a ring-shaped form. As in Fig. As shown in 3, the valve disc has a diameter on its inner side. 53 an inner diameter section 65 and a multitude of arc-shaped convex sections 66 on. The inner diameter section 65 It has a circumferential shape with a predetermined diameter. Each of the arc-shaped convex sections 66 is a partial projection that extends radially inwards from the inner diameter section 65 extends. The multitude of convex sections 66 is in equal angular segments on the valve disc53 designed to be installed at four or more positions (five in the example shown). The inner diameter section 65 has a smaller diameter than that of the inner seat 31 , who in Fig. 1 is shown, i.e., a smaller diameter than that of the circumferential wall surface of the concave contact section. 35 .

[0035] The valve disc 53 is via the cylindrical element 47 fitted. An inner diameter of the inner diameter section 65 the valve disc 53 is slightly larger than that of the flange sections 49 and the sliding motion guidance section 50 of the cylindrical element 47 An inner diameter of a circle defined by the vertices of the multitude of convex sections 66runs the path that has the smallest diameter (hereinafter the circle formed by connecting the tips of the convex sections). 66 (is obtained, is referred to as the “smallest diameter section”) on the inner circumference of the valve disc 53 This corresponds to a value smaller than that of the largest diameter section of each of the flange sections. 49 and is slightly larger than that of each of the engagement grooves 48 In other words, the largest diameter section of each of the flange sections has 49 a larger diameter than that of the smallest diameter segment of the inner circumference of the valve disc 53 , which is the next of the multitude of valve discs 53 until 58 to the piston main body 14 is up.

[0036] The inserted shaft section 21 the piston rod 16 is through the valve disc 53introduced. Additionally, the valve disc 53 about the cylindrical element 47 It fit. If the valve disc 53 about the cylindrical element 47 When fitted, the multitude of convex sections 66 elastic from one of the flange sections 49 deformed. If the convex sections 66 to the position of one of the engagement grooves 48 move (the upper of the engagement grooves) 48 , which in Fig. (as shown in Figure 1), the multitude of convex sections recovers. 66 elastic, to fit into one of the engagement grooves 48 , as in Fig. Figure 4 shows how to fit. In this way, the multitude of convex sections is achieved. 66 with the intervention groove 48 brought into action and consequently the valve disc 53 radial in relation to the cylindrical element 47arranged. In this state, due to a difference in diameter between an inscribed circle formed by the multitude of convex sections. 66 is trained, and the flange sections 49 and the sliding motion guidance section 50 , it is difficult for the valve disc 53 to outside the intervention groove 48 , into which the valve disc 53 It is fitted to move. Therefore, the valve disc 53 prevented from emerging from the cylindrical element 47 to be removed.

[0037] As in Fig. As shown in 3, the valve disc 53 an outer diameter section 69 and a multitude of groove sections 70 , which are provided at equal angular intervals in a circumferential direction on the outer diameter side. The outer diameter section 69It has a circumferential shape with a predetermined diameter. Each of the groove sections 70 is partially from the outer diameter section 69 from radially inwardly concave to form an arc-like shape. The outer diameter section 69 has an outer diameter of the valve disc 53 as the largest diameter of it and has a larger diameter than the outer diameter of the outer seat 32 , as in Fig. 1 shown, on. An inscribed circle, formed by soil sections of the multitude of groove sections. 70 The resulting shape has a smaller diameter than the inner diameter of the outer seat. 32 on. In this way, even when the valve disc 53 on the outer seat 32 The lines will be connected. 26 in conjunction with the lower chamber 13 brought. While the valve disc 53on the outer seat 32 When the valve disc is attached, flow paths (openings), each with a small flow path area, are created between the valve disc. 53 and the groove sections 70 trained to handle the lines 26 in conjunction with the lower chamber 13 to bring. On the other hand, if the valve disc 53 from the outer seat 32 When the lines are disconnected, they will be disconnected. 26 opened to access the lines 26 in conjunction with the lower chamber 13 to bring about a larger river channel area than that of the openings described above.

[0038] As in Fig. As shown in 4, the valve disc 54 , which are attached to the valve disc 53 is attached, and the valve disc 55 , which are attached to the valve disc 54 The valve discs have the same ring-shaped form. 54 and 55They serve to apply a preload force to the valve disc 53 to be installed in a valve closing direction. On the inner diameter side, each of the valve discs has 54 and 55 the same diameter as that of the inner diameter section 65 the valve disc 53 and has a circumferential shape with a predetermined diameter across its entire circumference. On the other hand, each of the valve discs has a feature on its outer diameter side. 54 and 55 the same diameter as that of the outer diameter section 69 the valve disc 53 and has a circumferential shape with a predetermined diameter over its entire circumference. The inserted shaft section 21 the piston rod 16 and the cylindrical element 57 , which extends over the entire inserted shaft section 21 as provided, are achieved by the valve discs 54 and55 introduced. In other words, the valve discs are 54 and 55 about the cylindrical element 47 It fit.

[0039] The valve disc 56 , which are attached to the valve disc 55 the valve disc 57 , which are attached to the valve disc 56 is attached, and the valve disc 58 , which are attached to the valve disc 57 The valve discs have the same ring-shaped form. 56 until 58 They serve to apply a preload force to the valve disc 53 to be applied in the valve closing direction. On the inner diameter side, each of the valve discs has 56 until 58 the same inner diameter as that of the valve discs 54 and 55 and has a circumferential shape with a predetermined diameter across its entire circumference. On the outer diameter side, each of the valve discs has 56 until58 a smaller diameter than that of the valve discs 54 and 55 and has a circumferential shape with a predetermined diameter over its entire circumference. The inserted shaft section 21 the piston rod 16 and the cylindrical element 47 , which is attached to the inserted shaft section 21 as provided, are achieved by the valve discs 56 until 58 introduced. In other words, the valve discs are 56 until 58 on the cylindrical element 47 It fit.

[0040] The spacer 60 , who in Fig. 1 is shown, which is attached to the valve disc 58 The spacer, when in contact with the surface, has a ring-shaped form. On the inner diameter side, the spacer has a... 60 the same diameter as that of the valve discs 56 until 58and has a circumferential shape with a predetermined diameter across its entire circumference. On the outer diameter side, the spacer has 16 a smaller outer diameter than that of the valve discs 56 until 58 and has a circumferential shape with a predetermined diameter over its entire circumference. Furthermore, the spacer 60 designed to have a greater thickness than that of the valve discs 53 until 58 to exhibit. The inserted shaft section 21 the piston rod 16 and the cylindrical element 47 , which is attached to the inserted shaft section 21 The spacer is intended to prevent this. 60 introduced. As a result, the spacer is radially positioned with respect to the cylindrical element. 47 and the piston rod 16 positioned.

[0041] The movable spring locking element 61, which is attached to the spacer 60 The component described above, which is attached, has a ring-shaped form. The movable spring locking element 61 has a cylindrical section 73 and a locking flange section 74 open. The locking flange section 74 extends radially from an axial end of the cylindrical section 73 outwards to form a ring-shaped form. The inserted shaft section 21 the piston rod 16 and the cylindrical element 47 , which extends over the entire shaft section 21 The movable spring locking element is intended to 61 inserted. At the time of insertion, the movable spring locking element is 61 held back to be movable on the sliding motion guide section 50 of the cylindrical section 47to be. As a result, the movable spring locking element is 61 axially movable, while radially movable in relation to the piston rod 16 is positioned. In other words, the cylindrical element is 47 into the movable spring locking element 61 introduced. The sliding motion guidance section 50 , on which the movable spring locking element 61 slides, is attached to the cylindrical element 47 on the side of the flange sections 49 , which are close to the main piston body 14 are provided, wherein the side is axially opposite to the side on which the piston main body 14 is arranged, is located. The position of the valve disc 58 on the movable spring locking element 61 allows the valve discs to be deformed. 53 until 58 in the valve opening direction beyond a defined degree.

[0042] The attached spring locking element 63 includes a graduated section 80 and a locking flange section 81 The stepped cylindrical section 80 encompasses a cylindrical surface with a small diameter 77 , an inclined surface 78 and a cylindrical surface with a large diameter 79 The cylindrical surface with a small diameter 77 It has a predetermined diameter. The inclined surface 78 has a diameter which, when separated in the axial direction from the cylinder surface, has a small diameter 77 from which it rises. The cylindrical surface with a large diameter 79 is on the side of the inclined surface 78 arranged opposite the side where the small-diameter cylindrical surface is located 77is arranged and has a predetermined diameter that is larger than that of the small-diameter cylindrical surface 77 is. The locking flange section 81 extends radially outwards from one end of the stepped cylindrical section 80 , which is located on the large-diameter side of the cylinder surface 79 located in the axial direction to form a ring-shaped form. An internal thread. 82 is located on an inner circumferential section of the stepped cylindrical section 80 formed, which is located on the locking flange section side 81 located in the axial direction. The attached spring locking element 63 protrudes over a thread with a threaded shaft section 22 the piston rod 16 via the internal thread 82 in intervention, while the inserted shaft section 21 the piston rod 16into the attached spring locking element 63 on the side of the stepped cylindrical section 80 is inserted, which is located axially opposite the side where the locking flange section is located. 81 is intended. In this state, one end of the attached spring locking element is in a position where it is not in use. 63 in the axial direction at one end of the cylindrical element 47 in the axial direction such that the attached spring locking element 63 the other end of the cylindrical element in the axial direction against the piston main body 14 presses. In particular, the attached spring locking element features 63 a function as a nut to retain the cylindrical element 47 between the attached spring locking element 63 and the piston main body 14 on.

[0043] A feather 62, which consists of a compression spiral spring, is located between the locking flange section 74 of the movable spring locking element 61 and the locking flange section 81 of the attached spring locking element 63 arranged by which the inserted shaft section 21 the piston rod 16 is introduced. A spring preload force 62 is attached to the valve discs 53 until 58 by means of a mediation of the movable spring locking element 61 and the spacer 60 transferred. The movable spring locking element 61 , the spring 62 and the attached spring locking element 63 form a spring force application mechanism (spring force application device) 84 to apply a force to the valve discs in the valve closing direction 53 until 58 regardless of the valve discs53 until 58 applied force. It should be noted that a difference in level is provided, so that the height of the outer seat 32 in the axial direction of the piston main body 14 towards the lower chamber 13 is larger than that of the inner seat 31 Therefore, if the valve discs 53 until 58 by means of the spring preload 62 through the mediation of the movable spring locking element 61 and the spacer 60 When pressed, the valve disc 53 , which is attached to the inner seat 31 and the outer seat 32 is slightly deflected so that the outer circumferential side of it is brought closer to the spring, in order to be brought into close contact with it. 62 in the axial direction of the piston main body 14 than its inner circumferential side. Consequently, the valve disc 54, which are attached to the valve disc 53 is attached, and the valve disc 55 , which are attached to the valve disc 54 is located, as in this case in the valve disc 53 deflected. As a result, the valve discs are under tension. 54 until 55 the valve disc 53 before, to the valve disc 53 in close contact with the outer seat 32 bring to.

[0044] The damping force generation mechanism 29 includes a ring-shaped disc valve 90 , a ring-shaped spacer 91 and a ring-shaped valve limiting element 92 The disc valve 90 can simultaneously sit on the inner seat 41 and the outer seat 42 sit. The spacer 91 is on the side of the disc valve 90 provided, which is opposite the side on which the piston main body is located 14 is located. The valve limiting element92 is on the side of the spacer 91 provided, which is opposite the side on which the piston main body is located 14 is arranged.

[0045] The disc valve 90 , which is the inner seat 41 and the outer seat 42 The valve, which can touch and be separated from this object, has a ring-shaped form. On its inner diameter side, the disc valve has... 90 a circumferential shape with a predetermined diameter that is smaller than that of the inner seat 41 and the mounting seat 40 The disc valve has a [feature] on its outer diameter side. 90 a circumferential shape with a predetermined diameter that is larger than that of the outer seat 42 Through holes 94 are between the inner seat 41 and the mounting seat 40 designed to pass axially through the disc valve 90to run through them. The passageways. 94 bring the lines 26 in conjunction with the upper chamber 12 The inserted shaft section 21 the piston rod 16 is through the disc valve 90 introduced. As a result, the disc valve 90 radial in relation to the piston rod 16 arranged. The disc valve 90 forms a river channel (opening) with a small river channel area with the guide grooves (not shown) that are attached to the outer seat 42 are trained while it is on the outer seat 42 is located to connect the lines 27 in conjunction with the upper chamber 12 to bring it out. On the other hand, if the disc valve 90 from the outer seat 42 when the lines are separated 27 opened to connect with the upper chamber 12to be brought with a larger river channel area than that of the opening.

[0046] A spacer 91 , which is attached to the disc valve 90 The spacer, when in contact with the surface, has a ring-shaped form. On the inner diameter side, the spacer has a... 91 have the same inner diameter as the disc valve 90 and forms a circumferential shape with a predetermined diameter across its entire circumference. The spacer has a [feature / characteristic] on the outer diameter side. 91 a smaller outer diameter than the diameter of the through holes 94 of the disc valve 90 and forms a circumferential shape with a predetermined diameter across the entire diameter. The spacer 91 is designed to have a greater thickness than that of the disc valve. 90 The inserted shaft section 21 the piston rod 16 is caused by the spacer91 introduced. As a result, the spacer is 91 radial in relation to the piston rod 16 arranged.

[0047] The valve limiting element 92 , which is attached to the spacer 91 The valve limiting element has a ring-shaped form. On the inner diameter side, it features a ring-shaped form. 92 the same inner diameter as that of the spacer 91 and forms a circumferential shape with a predetermined diameter across its entire circumference. The valve limiting element has a [feature / characteristic] on its outer diameter side. 92 the same outer diameter as that of the disc valve 90 It forms a circumferential shape with a predetermined diameter across its entire circumference. Furthermore, the valve limiting element... 92 shaped to have a greater thickness than that of the spacer 91 The inserted shaft section 21 the piston rod16 is caused by the valve limiting element 92 introduced. As a result, the valve limiting element is 92 radial in relation to the piston rod 16 positioned. A ring-shaped level difference section 96 , which creates a slight level difference in order to be located on the piston rod main body side 14 to be arranged in the axial direction is on the outer circumferential section of the valve limiting element. 92 trained. Through holes 97 are formed at the positions located on the radially inner side of the level difference section 96 of the valve limiting element 92 are to pass axially through the valve limiting element 92 to run through them. The passageways. 97 bring the lines 26 constant in connection with the upper chamber 12 through the through holes 94 of the disc valve 90. The separation of the disc valve 90 from the outer seat 42 brings the lines 27 through a radially extending gap between the disc valve 90 and the piston 11 in conjunction with the upper chamber 12 At this point, the valve limiting element limits the 92 the deformation of the disc valve 90 in the valve opening direction beyond a predetermined level.

[0048] For the manufacture of the piston 11 and the damping force generation mechanisms 28 and 29 are attached to the piston rod 16 the valve limiting element 92 , the spacer 91 , the disc valve 90 and the piston 11 (including the sliding element) 15 , which was previously attached to the piston main body 14 was arranged) in this order on an end surface of the main shaft section 20, which is located on the inserted side of the shaft section 21 is located, stacked, while the threaded shaft section 22 and the inserted shaft section 21 be inserted in the state in which the threaded shaft section 22 the piston rod 16 For example, it is pointed at one upper end. On the other hand, regardless of the process mentioned above, the valve disc 53 about the cylindrical element 47 fitted from one side in the axial direction to engage in one of the grooves 48 to fit, which are located on one side in the axial direction. While the threaded shaft section 22 and the inserted shaft section 21 through the cylindrical element 47 The cylindrical element is inserted through it. 47 in the concave landing section 35 of the piston11 arranged. Next, the valve discs are arranged. 54 until 58 , the spacer 60 , the movable spring locking element 61 and the feather 62 in this order on the valve disc 53 stacked, while the cylindrical element 47 This is how it is introduced. Then the attached spring locking element is... 63 by means of a thread with the threaded shaft section 22 The valve disc was engaged. It should be noted that at the time of engagement, the valve disc was... 53 with the cylindrical element 47 , which is carried out independently, the valve discs 54 until 58 , the spacer 60 and the movable spring locking element 61 They can be stacked in this order beforehand. The piston rod 21can be introduced through the set of elements mentioned above, so that the set of elements mentioned above is at the piston 11 is ordered.

[0049] As a result, the valve limiting element 92 , the spacer 91 , the disc valve 90 , the piston 11 and the cylindrical element 47 between the end surface of the main shaft section 20 , located on the side of the inserted shaft section 21 located, and an end surface of the attached spring locking element 63 , which are located on the side opposite the locking flange section 81 of the stepped cylindrical section 80 is located, arranged to be integral to the piston rod 16 to be attached. As a consequence, the attached spring locking element is 63 even on the piston rod 16integrally fastened. Furthermore, the valve discs are 53 until 58 , the spacer 60 , the movable spring locking element 61 and the feather 62 between the locking flange section 81 of the attached spring locking element 63 and the piston 11 held back.

[0050] Alternatively, as in Fig. As shown in section 5, a temporary mounting frame is used. 104 prepared. The temporary mounting frame 104 includes a shaft section with a large diameter 101 , an inserted shaft section 102 and an inclined shaft section 103 The shaft section with a large diameter 101 is attached to a lower section of the temporary mounting frame 104 trained. In a middle section of the temporary mounting frame 104 is the inserted shaft section 102, which has a smaller diameter than the shaft section with a larger diameter 101 has the same diameter as that of the inserted shaft section 21 exhibits, formed. The inclined shaft section 103 , which is inclined to a point, is at an upper end of the temporary mounting frame 104 trained. The valve limiting element 92 , the spacer 91 , the disc valve 90 and the piston 11 are in this order on an end surface of the large-diameter shaft section 101 on the side of the inserted shaft section 102 stacked, while the inclined shaft section 103 and the inserted shaft section 102 are introduced through the aforementioned stacked elements. On the other hand, the valve disc 53 over the outer side of the cylindrical element 47fitted from one side in the axial direction to engage in one of the grooves 48 to be fitted, which is located on one side in the axial direction. The cylindrical element 47 is located in the concave docking section 35 of the piston 11 arranged, while the inserted shaft section 102 into the cylindrical element 47 is introduced. Next, the valve discs are installed. 54 until 58 , the spacer 60 and the movable spring locking element 61 in this order on the valve disc 53 stacked, while the cylindrical element 47 is introduced by the elements mentioned above. Subsequently, the set of elements mentioned above is removed by the temporary mounting frame. 104 removed. Subsequently, the set of elements is removed directly from the end surface of the main shaft section. 20on the side of the inserted shaft section 21 arranged, while the threaded shaft section 22 and the inserted shaft section 21 the piston rod, which is held back, so that the threaded shaft section 22 It is positioned at the upper end and is introduced by the set of elements. Next, after the spring 62 on the movable spring locking element 61 The attached spring locking element was arranged 63 by means of a thread with the threaded shaft section 22 brought into play. It should be noted that even in this case, the valve discs 53 until 58 , the spacer 60 and the movable spring locking element 61 previously on the cylindrical element 47can be attached so that the set of elements obtained by the attachment is attached to the piston 11 can be arranged while the piston rod 21 is introduced thereby.

[0051] As another alternative, as in Fig. As shown in section 6, a temporary mounting frame is used. 111 prepared. The temporary mounting frame 111 includes a large diameter section 106 , an inserted shaft section 107 , an inclined shaft section 108 , an inserted shaft section 109 and an inclined shaft section 110 The shaft section with a large diameter 106 is attached to a lower section of the temporary mounting frame 111 trained. In a lower central section of the temporary mounting frame 111 is the inserted shaft section 107, which has a smaller diameter than the shaft section with a larger diameter 106 and the same diameter as that of the inserted shaft section 21 exhibits, formed. The inclined shaft section 108 is attached to an intermediate central section of the temporary mounting frame 111 trained. The inserted shaft section 109 , which has a slightly smaller diameter than the smallest diameter of the inner thread 82 of the attached spring locking element 63 exhibits, is located on an upper central section of the temporary mounting frame 111 formed. The inclined shaft section 110 , which is inclined to a point, is at an upper end of the temporary mounting frame 111 trained. The valve limiting element 92 , the spacer 91 , the disc valve 90 and the piston 11in this order on an end surface of the large-diameter shaft section 106 on the side of the inserted shaft section 107 stacked, while the inclined shaft section 110 , the inserted shaft section 109 , the inclined shaft section 108 and the inserted shaft section 107 are introduced through the stacked elements mentioned above. On the other hand, regardless of the process described above, the valve disc 53 fitted along the outer side of the cylindrical element from one side in the axial direction to engage with one of the engagement grooves 48 to be brought into engagement, which is located on one side in the axial direction. The cylindrical element 47 is located in the concave docking section 35 of the piston 11 arranged, while the inclined shaft section 110 , the inserted shaft section109 , the inclined shaft section 108 and the inserted shaft section 107 into the cylindrical element 47 to be introduced. Next, the valve discs will be installed. 54 until 58 , the spacer 60 , the movable spring locking element 61 , the spring 62 and the attached spring locking element 63 in this order on the valve disc 53 stacked, while the cylindrical element 47 is inserted through the aforementioned stacked elements. Next, a set of the aforementioned elements is removed from the temporary mounting frame. 111 removed. Subsequently, the set of elements is removed directly from the end surface of the main shaft section. 20 on the side of the inserted shaft section 21 arranged, while the threaded shaft section 22and the inserted shaft section 21 the piston rod 16 , which are held back, so that the threaded shaft section 22 It is arranged at the upper end, introduced by the set of elements. Next, after the spring 62 on the movable spring locking element 61 The attached spring locking element is arranged 63 by means of a thread with the threaded shaft section 22 brought into play. It should be noted that even in this case, the valve discs 53 until 58 , the spacer 60 and the movable spring locking element 61 previously with the cylindrical element 47 can be combined so that a set of elements obtained by fastening can be attached to the piston 11 can be arranged while the piston rod 21is introduced thereby.

[0052] Here, during the extension stroke, in which the piston rod 16 moved towards the exit side, the oil from the upper chamber 12 into the lower chamber 13 through the pipes 26 . When the piston speed (hereinafter referred to as “piston velocity”) is within a very small speed range, the oil fluid flowing from the upper chamber will be obstructed. 12 into the line 26 It was essentially introduced into the lower chamber 13 through the constant openings that are created by the outer seat 32 be formed, which is attached to the piston 11 was formed, and through the groove sections 70 the valve disc 53 , which is on the outer seat 32is present. At the moment of oil fluid flow, a damping force is generated, which creates an opening property (damping force essentially proportional to the square of the piston speed).

[0053] Furthermore, when the piston speed increases to reach a low speed range, the oil fluid that comes from the upper chamber exhibits 12 into the pipes 26 was introduced, creating high pressure at the point where the oil fluid flows towards the valve discs. 53 until 58 The oil fluid flows out. As a result, the oil fluid essentially flows between the valve disc. 53 and the outer seat 32 , to enter the lower chamber 13 to flow, while it begins as a starting point, the valve discs 53 until 58 on the outer circumferential section of the spacer 60to deform. Therefore, the damping force, which has a valve characteristic curve (damping force essentially proportional to the piston speed), is generated.

[0054] Furthermore, as the piston speed continues to increase, the oil fluid coming from the upper chamber exhibits 12 into the line 26 was introduced, creating a further increasing pressure at the position where the oil fluid flows towards the valve discs. 53 until 58 It flows out. When the pressure of the oil fluid creates a reaction force on the spring. 62 exceeds the spring 62 compressed. While the valve discs 53 until 58 , the spacer 60 and the movable spring locking element 61 from the outer seat 32 and the inner seat 31 When separated, the oil fluid flows between the valve disc 53 and the outer seat 32 , to enter the lower chamber13 to flow. Therefore, a damping force is associated with a property of the lines. 26 (The damping force is essentially proportional to the piston speed with a lower gradient than that of the valve characteristic curve described above). It should be noted that at this point the axial length of the groove bottom surface 48a is adjusted so that the valve disc 53 within the area of ​​the grooved floor surface 48a the corresponding from the intervention grooves 48 moved without moving out of the corresponding engagement grooves 48 to be removed. Furthermore, the axial length of the sliding motion guide section is 50 adjusted so that the spring locking element 61 within the area of ​​the sliding motion guide section 50 of the cylindrical element 47 moved.

[0055] During a displacement stroke (contraction), in which the piston rod 16 As the oil fluid moves towards the compression side, it flows through the lines. 27 from the lower chamber 13 towards the upper chamber 12 When the piston speed is within the very low speed range, the oil fluid flowing from the lower chamber 13 into the line 27 was introduced, essentially into the upper chamber 12 through the constant opening created by the guide grooves (not shown) on the outer seat 42 of the piston 11 are formed, is formed and through the disc valve 90 , which is on the outer seat 42 at this point, a damping force with the opening property (damping force essentially proportional to the square of the piston speed) is generated.

[0056] Furthermore, if the piston speed increases to reach the low speed range, the oil fluid that comes from the lower chamber flows 13 into the pipes 27 was introduced, essentially between the disc valve 90 and the outer seat 42 , to enter the upper chamber 12 to flow while the disc valve 90 The valve is opened. Therefore, a damping force is generated with the valve characteristic curve (damping force essentially proportional to the piston speed).

[0057] The damper described in the above-cited JP 57-137735 A involves engaging an element inserted into a disc valve and a spring-loaded actuating device for pre-tensioning the disc valve in a valve closing direction through which a piston rod is inserted, by means of a thread. Therefore, insertion / attachment becomes complicated.

[0058] On the other hand, according to the embodiment described above, the cylindrical element allows 47 , which is in the valve discs 53 until 58 was introduced and the spring force application mechanism 84 it the piston rod 16 to pass through it without the piston rod 16 It can be engaged by means of a thread. Therefore, the insertion / fastening process can be simplified.

[0059] Furthermore, if the cylindrical element inserted into the disc valves and spring-loaded actuator is pressed to fit into the inner seat of the piston body, the pressing process becomes complicated. Additionally, there is a possibility of deforming the seat surface of the inner seat due to the pressing action. Furthermore, if the cylindrical element cannot be pressed in a normal manner, the following problems arise. For example, the piston body, particularly the inner seat, will be damaged. If the cylindrical element is fitted at an angle, the disc valves may not seat correctly on the inner and outer seats to allow for oil flow. Additionally, the disc valves may not be able to move.

[0060] On the other hand, according to this embodiment described above, the cylindrical element 47 , which is in the valve discs 53 until 58and the spring force application mechanism 84 is inserted, provided with the radially extending gap that is on the inner side of the inner seat 31 of the piston main body 14 This is intended. Therefore, pressing is not necessary, which simplifies the process (insertion / attachment). Additionally, the problems mentioned above, caused by abnormal pressure, can be prevented from occurring.

[0061] The flange sections 49 are located on the outer circumference of the cylindrical element 47 the piston main body side 14 formed. The section with the largest diameter of each of the flange sections 49 is larger than the smallest diameter section of the inner circumference of the valve disc 53 , which is the next of the valve discs 53 until 58 to the piston main body 14 is. Therefore, the valve disc 53prevented from doing so by the cylindrical element 47 to be removed. Due to the structure in which the cylindrical element 47 with the radially extending gap located on the inner side of the inner seat 31 of the piston main body 14 The cylindrical element is designed and equipped to move. 47 sometimes relative to the piston body 14 due to the insertion / fastening process. Even in such conditions, the valve disc can 53 and the valve discs 54 until 58 , which are stacked on it, are prevented from doing so by the cylindrical element 47 to be removed. Except in the case where the aforementioned setup is used to prevent the removal of the valve disc. 53 from the cylindrical element 47 When used, the cylindrical element moves 47 relative to the piston main body 14during the insertion / fastening process described above, and consequently the valve discs 53 until 58 , which are attached to the main piston body 14 were arranged to the detriment of the cylindrical element 47 removed. Subsequently, there is a concern that one of the valve discs might be damaged. 53 until 58 between the cylindrical element 47 and the piston main body 14 is jammed. If the attached spring locking element... 63 by means of a thread with the piston rod 16 If the valve disc is engaged without the clamped disc being noticed, there is a risk that the clamped disc could be deformed or damaged. This problem does not occur in this embodiment.

[0062] On the cylindrical element 47 are the flange sections 49formed on axially opposite sides. Therefore, the alignment limit at the time of insertion / fastening is eliminated to prevent incorrect insertion / fastening. As a result, operability during the insertion / fastening process is improved.

[0063] The cylindrical element 47 includes the sliding motion guidance section 50 , on which the movable spring locking element 61 the spring force application mechanism 84 slides, which is on the opposite side of the upper flange section 49 to the piston main body 14 is intended. Therefore, the movement of the movable spring locking element is 61 Preferred preference.

[0064] The smallest diameter section of the inner circumference of the valve disc 53 , which is the next of the valve discs 53 until 58 to the valve body 14is due to the large number of convex sections. 66 formed, corresponding to the partial projections that are located on the inner circumferential diameter section 65 are formed. Therefore, the valve disc 53 preferably via the corresponding flange sections 49 to occur in order to align with the corresponding engagement grooves 48 to be brought into action, into which the valve disc 53 It is fitted. Consequently, the ease of use during the insertion / attachment process is improved. It should be noted that not every engagement groove is compatible. 48 It is required that it has a ring-shaped form and can be a groove interrupted in the circumferential direction, which is concave to accommodate the positions of the convex sections. 66 to comply.

[0065] By providing at least four convex sections 66 can the valve disc 53It can be moved axially, while its inclination is suitably limited. Furthermore, the valve disc can 53 being prevented from the corresponding intervention grooves 48 to be removed, into which the valve disc 53 is fitted.

[0066] Developing the inner seat 31 on the piston main body 14 eliminates the need for an element to control the original deflection of the valve discs 53 until 58 . At the same time, a variation of an original deflection of the valve discs can occur. 53 until 58 be limited, as the height of the inner seat 31 is stabilized.

[0067] It should be noted that although the application of the present invention to the damping force generation mechanism 28 , which is attached to the piston 11As described above, any damping force generation mechanism provided on the shock absorber can be used, regardless of whether the damping force generation mechanism is of the single-cylinder or multi-cylinder type. The present invention is also applicable to other different damping force generation mechanisms, such as a base valve formed between a reservoir chamber provided between an internal cylinder and an external cylinder, and a lower chamber in the internal cylinder of the multi-cylinder type cylinder.

[0068] According to the embodiment described above, the damper has a structure comprising: a cylinder in which an operating fluid is enclosed; a piston slidably inserted into the cylinder to divide the interior of the cylinder into two chambers; a piston rod connected to the piston, the piston rod having at least one end extending out of the cylinder; a valve body having a channel through which the operating fluid flows due to a sliding movement of the piston; an attached stem inserted through a valve body insertion hole formed through the valve body; an inner seat having an annular shape extending around the valve body insertion hole; and an outer seat having an annular shape provided on an outer circumferential side of the inner seat.to extend from the outer circumferential side of the inner seat and to enclose an opening of the conduit; wherein the disc valve has an annular shape capable of coming into contact with and being separated from the inner and outer seats, wherein the disc valve is designed to allow the attached stem to pass through the disc valve; a spring-applying device to allow the attached stem to be inserted through the spring-applying device to apply a force to the disc valve in a valve-closing direction; and a cylindrical element to allow the attached stem to be inserted through the cylindrical element, wherein the cylindrical element is inserted into the disc valve and the spring-applying device, in which: the cylindrical element is provided,to have a radially extending gap on an inner side of the inner seat of the valve body. As described above, the cylindrical element inserted into the disc valve and spring-loaded actuation device has a structure to allow the attached stem to be inserted through it. Therefore, assembly can be simplified. Additionally, the cylindrical element has a structure that incorporates the radially extending gap on the inner side of the inner seat of the valve body. Therefore, pressing is not required, simplifying the insertion / attachment process. As a result, problems due to abnormal pressing do not occur.

[0069] Furthermore, the disc valve comprises a plurality of valve discs, and the flanged section is formed on the outer circumference of the cylindrical element on the valve body side. The largest diameter section of the flanged section has a larger diameter than the smallest diameter section of the inner circumference of the valve disc closest to the valve body. Therefore, even if the cylindrical element is unexpectedly moved relative to the valve body during the insertion / installation process, the valve disc can be prevented from being removed from the cylindrical element. As described above, it is more preferred to form the flanged section on the outer circumference of the cylindrical element on the valve body side.However, even if the flange section is not formed on the cylindrical element—in other words, if the cylindrical element is straight in the axial direction without any machining—pressing is not required. Therefore, the problem of complications during the insertion / fastening process caused by pressing is avoided. If the flange section is formed on the cylindrical element, the insertion / fastening process can be further simplified.

[0070] Furthermore, the second flange section is formed on the cylindrical element on the side axially opposite the side where the flange section is located. This prevents alignment issues during insertion / fastening and thus avoids incorrect insertion / fastening. As a result, the ease of handling during the insertion / fastening process is improved.

[0071] Furthermore, the large-diameter section on which the spring force application device slides is located on the cylindrical element on the side axially opposite the side where the flange section is provided. Therefore, the spring force application device can be moved appropriately.

[0072] Furthermore, the section of the valve disc with the smallest diameter, closest to the multiple valve discs of the valve body, is formed by the numerous convex sections that partially extend from this inner circumferential diameter section. Therefore, the valve disc can easily pass over the flange section. Consequently, the ease of insertion and installation is improved.

[0073] Furthermore, at least four convex sections are provided. Therefore, the valve disc can be moved axially while its inclination is appropriately limited. Furthermore, the valve disc can be prevented from being removed from the flange section.

[0074] Although only some exemplary embodiments of this invention have been described in detail above, those skilled in the art can readily see that many modifications of these exemplary embodiments are possible without substantially departing from the new teaching and advantages of this invention. Accordingly, it is intended to include all such modifications within the scope of protection of this invention. QUOTES INCLUDED IN THE DESCRIPTION

[0075] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0076] JP 57-137735 A [0002, 0057]

Claims

[1] Shock absorber, comprising: a cylinder ( 10 ), in which an operating fluid is enclosed; a piston ( 11 ), which is slidably inserted into the cylinder to divide the interior of the cylinder into two chambers; a piston rod ( 16 ) connected to the piston, wherein the piston rod has at least one end extending from the cylinder; a valve body ( 14 ), which is a line ( 26 ) has a passage through which the operating fluid flows due to a sliding movement of the piston; a fixed shaft ( 21 ), which passes through a valve body mounting hole ( 23 ) is introduced, which is formed by the valve body; an inner seat ( 31 ) with a ring shape provided around the valve main body insertion hole to extend from the valve main body insertion hole; an outer seat ( 32 ) with a ring shape provided on an outer circumferential side of the inner seat to extend from the outer circumferential side of the inner seat and to enclose an opening of the conduit; a disc valve ( 53 , 54 , 55 , 56 , 57 , 58 ), which has a ring shape capable of coming into contact with and separating from the inner seat and the outer seat, wherein the disc valve allows the attached stem to pass through the disc valve; a spring force application device ( 84 ) to apply a force in a valve closing direction to the disc valve, while allowing the attached stem to be inserted through the spring force application device; and a cylindrical element ( 47), to allow the attached shaft to be inserted through the cylindrical element, wherein the cylindrical element is inserted into the disc valve and the spring force application device, wherein: The cylindrical element is designed to have a radially extending gap on an inner side of the inner seat of the valve main body. [2] Shock absorber according to claim 1, wherein the disc valve has a plurality of valve discs ( 53 , 54 , 55 , 56 , 57 , 58 ) has a flange section ( 49 ) comprising, which is formed on an outer circumference of the cylindrical element on a side that is close to the valve body and wherein a section with the largest diameter of the flange section has a larger diameter than that of a section with a smallest diameter of an inner circumference of a ( 53) the multitude of valve discs that are located closest to the main valve body. [3] Shock absorber according to claim 2, wherein the cylindrical element has a second flange section ( 49 ) comprises, which is formed on the cylindrical element on one side axially opposite to the side on which the main valve body is provided. [4] Shock absorber according to claim 2 or 3, wherein the cylindrical element has a large diameter section ( 50 ), on which the spring force application device slides, which is provided on one side axially opposite to the side on which the valve main body is provided. [5] Shock absorber according to one of claims 2 to 4, wherein the section with the smallest diameter of the inner circumference is separated from one of the plurality of valve discs by a plurality of convex sections ( 66) is formed, corresponding to partial projections extending from an inner cylindrical diameter section, with the valve disc being the closest to the main valve body. [6] Shock absorber according to claim 5, wherein the number of convex sections is at least four.