JP4768484B2 - Diaphragm connection structure - Google Patents

Description

  The present invention relates to a diaphragm connecting structure.

  In the conventional diaphragm connecting structure, for example, as shown in FIG. 4, one end of a cylindrical diaphragm D is connected to a cylindrical air piston P coupled to the outer periphery of a cylinder C of the shock absorber. The other end of the diaphragm D is folded and the end of the air chamber A is covered with the end of the cylindrical air chamber A having a diameter larger than that of the air piston P connected to the piston rod R of the shock absorber. When inserted into the cover B, the other end of the diaphragm D is sandwiched between the air chamber A and the cover B.

  The volume of the air chamber G partitioned by the air chamber A, the diaphragm D, and the air piston P changes as the air piston P enters and exits the air chamber A as the shock absorber expands and contracts. The diaphragm D and the air piston P work together as a gas spring (see, for example, Patent Document 1).

  By the way, when connecting the above-mentioned diaphragm D to the end of the air chamber A, first, one end of the diaphragm D is connected to the outer periphery of the air piston P coupled to the cylinder C of the shock absorber by fastening with a fixing band H1. The other end of the diaphragm D is put on the end of the air chamber A in a folded state.

Subsequently, the cover B arranged on the outer peripheral side of the diaphragm D from the above state is attached from the lower side in FIG. 4 of the air chamber A. At that time, the diaphragm D in the folded state is inserted into the cover B. Then, the end of the air chamber A is inserted into the upper end of the cover B with the end of the diaphragm D attached, and the end of the diaphragm D is inserted through a fixed band H2 provided on the inner periphery of the upper end of the cover B. The cover B and the air chamber A are sandwiched.
JP 2001-12525 A (FIGS. 1 and 2)

  Since the above-described gas spring supports the vehicle body weight of the vehicle, the pressure in the air chamber is extremely high and the pressure acting on the diaphragm D naturally increases. Therefore, the pressure resistance and durability of the diaphragm D are increased. Therefore, the diaphragm D is configured to include a reinforcing layer formed of a cord or resin cloth inside the rubber film layer on the outer surface, and one end of the diaphragm D is used as an air piston P as described above. After the connection, even if the other end of the diaphragm D is folded over the end portion of the air chamber A, the diaphragm D returns to its original shape by the restoring force, so that the other end of the diaphragm D is the air chamber. It may come off from the end of A.

  When the other end of the diaphragm D is sandwiched between the air chamber A and the cover B, as described above, the cover B is moved toward the air chamber A from below in FIG. 4 and the diaphragm D is placed inside the cover B. Since the end of the air chamber A is press-fitted into the cover B while intruding, the other end of the diaphragm D is detached from the end of the air chamber A due to its restoring force during this operation. Even so, since the other end of the diaphragm D is covered with the cover B, it is not possible to visually confirm that the other end of the diaphragm D is dropped from the end of the air chamber A from the outside. The cover B is attached to the end of the air chamber A.

  Then, the end portion of the diaphragm D is not firmly held between the air chamber A and the cover B, which causes the diaphragm D to drop off or air leakage when a high pressure is applied to the diaphragm D, resulting in a product yield. It will get worse.

  Accordingly, the present invention has been developed to improve the above-described problems, and an object of the present invention is to provide a diaphragm connecting structure that can securely hold the diaphragm between the air chamber and the air piston. That is.

The problem-solving means of the present invention includes a cylindrical cover having one end of a cylindrical diaphragm coupled to a cylindrical air piston coupled to an outer periphery of a shock absorber cylinder, and the other end of the diaphragm folded back. The diaphragm is connected to the piston rod of the shock absorber and is sandwiched between a cylindrical air chamber whose end is larger in diameter than the air piston inserted into the cover. wherein the Rutotomoni the convex portion is provided a convex portion caught by the cover is held between the end face of the upper end portion of the end cover of the air chamber.

According to the diaphragm coupling structure of the present invention, the convex portion of the other end of the diaphragm is hooked on the cover, and the other end of the diaphragm is securely put on the end of the air chamber without coming off from the end of the air chamber. In this state, the air chamber is sandwiched between the end portion of the air chamber and the cover , that is, the diaphragm can be firmly fixed by the air chamber .

  In addition, since the other end of the diaphragm is securely held between the end of the air chamber and the end of the air chamber, the assembly of the diaphragm becomes very simple.

Furthermore, since the other end of the diaphragm can be securely clamped between the end of the air chamber and the end surface of the upper end of the cover , the other end position of the diaphragm can be visually observed from the outside, and the other end of the diaphragm is connected to the upper end of the cover. It can be easily confirmed that the object is pinched.
In the second aspect of the present invention, the other end of the diaphragm is compressed against the outer diameter of the air chamber by being pressed against the annular recess of the air chamber by a fixing band provided on the inner periphery of the cover. As a result, the gas spring mechanism is firmly connected to the assembled state, and there is no concern about the strength of the assembled gas spring mechanism, and the product yield is improved.

  The present invention will be described below based on the embodiments shown in the drawings. FIG. 1 is a partially cutaway side view of a shock absorber to which a diaphragm connection structure according to an embodiment is applied. FIG. 2 is a side view of the diaphragm. FIG. 3 is a partially cutaway side view of a shock absorber to which a diaphragm coupling structure according to another embodiment is applied.

  As shown in FIG. 1, the diaphragm connection structure in one embodiment is embodied in a gas spring mechanism 10 of the shock absorber 1. The shock absorber 1 is well-known and not shown in detail, but the cylinder 2, a piston (not shown) that is slidably inserted into the cylinder 2, and a piston that is connected to the piston and movably inserted into the cylinder 2. When the piston rod 3 exhibits relative movement in the axial direction with respect to the cylinder 2, a predetermined damping force is exhibited.

  Subsequently, the gas spring mechanism 10 includes a cylindrical air piston 11 coupled to the outer periphery of the cylinder 2, a cylindrical air chamber 12 connected to the piston rod 3 and having a larger diameter than the air piston 11, A flexible diaphragm 13 connected to the air chamber 12 and allowing the air piston 11 and the air chamber 12 to move in the axial direction, and a cylindrical cover 14 connected to the lower end of the air chamber 12 in FIG. The air piston 15, the air chamber 12, and the diaphragm 13 define an air chamber 15, and gas is supplied from a pipe joint 16 connected to an external air tank in the air chamber 15 or By discharging to the outside, the pressure in the air chamber 15 can be controlled and the spring force of the gas spring mechanism 10 can be adjusted. To have.

  The air piston 11 includes a mortar-shaped bottom portion 11a and a cylindrical portion 11b extending from the upper end in FIG. 1 of the bottom portion 11a, and a circular opening 11c provided in the shaft core portion of the bottom portion 11a is press-fitted into the outer periphery of the cylinder 2. They are joined by welding or the like.

  The air chamber 12 includes a top portion 12 a and a cylindrical portion 12 b that hangs down from the top portion 12 a, and the shaft core portion of the top portion 12 a is connected to the upper end of the piston rod 3. Further, the inner diameter of the cylindrical portion 12b is set larger than the outer diameter of the cylindrical portion 11b of the air piston 11 so as to secure a space where the diaphragm 13 is connected in a folded state. Accordingly, the air piston 11 can enter and exit from the air chamber 12.

  Further, the end 12c, which is the lower end in FIG. 1 of the air chamber 12, has a smaller diameter than the cylindrical portion 12b. When the other end b of the diaphragm 13 is sandwiched between the end 12c and the cover 14, the diaphragm 13 is firmly fixed. An annular recess 12d is provided so as to be able to be held.

  Further, the cover 14 is a cylinder having a tapered lower end, and the upper end portion 14a is expanded in diameter so that the other end b of the diaphragm 13 can be fastened to the inner peripheral side of the upper end portion 14a. In addition, a fixed band 14b is provided.

  As shown in FIG. 2, the diaphragm 13 is formed in a cylindrical shape having a small diameter at one end a and a large diameter at the other end b, and the outer periphery of the other end b of the diaphragm 13 has an upper end portion 14 a of the cover 14. A hook-shaped convex portion 13a that is caught on the end surface is provided.

  In order to connect the diaphragm 13 to the air piston 11 and the air chamber 12, first, one end a of the diaphragm 13 is connected to the outer periphery of the air piston 11 coupled to the cylinder 2 of the shock absorber 1 with an annular fixing band 17. To do.

  After that, the middle part of the diaphragm 13 is folded back, and the other end b of the diaphragm 13 is put on the end part 12 c of the air chamber 12.

Subsequently, the cover 14 disposed on the outer peripheral side of the diaphragm 13 is attached from below the air chamber 12 from the above state. At that time, the folded-back diaphragm 13 is inserted, and the end 12c of the air chamber 12 is inserted into the upper end 14a of the cover 14 while the other end b of the diaphragm 13 is attached and pushed. .

  Then, the convex part 13a provided at the other end b of the diaphragm 13 is caught by the end surface of the upper end part 14a of the cover 14, and the diaphragm 13 returns even if it returns to the original cylinder state from the folded state by the restoring force. The other end b is kept in a state of being covered with the end portion 12 c of the air chamber 12 and inserted into the upper end portion 14 a of the cover 14.

  The other end b of the diaphragm 13 is pressed against the annular recess 12d of the end portion 12c of the air chamber 12 by a fixed band 14b provided on the inner periphery of the upper end portion 14a of the cover 14, and the cover is passed through the fixed band 14b. 14 and the end 12 c of the air chamber 12.

  Since the inner diameter of the fixed band 14b is set slightly smaller than the outer diameter of the portion other than the annular recess 12d of the end 12c of the air chamber 12, the other end b of the diaphragm 13 is connected to the fixed band 14b and the cover 14 as described above. Is compressed in a shape that conforms to the outer diameter of the end portion 12c, and is sandwiched between the cover 14 and the end portion 12c of the air chamber 12, and is firmly connected to the air chamber 12. The

  When the diaphragm 13 is connected in this manner, the other end b of the diaphragm 13 is securely connected to the diaphragm 13 without the projection 13a being caught by the cover 14 and the other end b being detached from the end 12c of the air chamber 12. The other end b of the air chamber 12 is sandwiched between the end 12 c of the air chamber 12 and the fixing band 14 b of the cover 14 in a state where the other end b of the air chamber 12 is covered.

  In addition, according to the diaphragm connecting structure described above, the end portion 12c of the air chamber 12 and the fixing band 14b of the cover 14 are securely attached while the other end b of the diaphragm 13 is covered with the end portion 12c of the air chamber 12. Since it is clamped, the assembly work of the diaphragm 13 becomes very simple.

  Furthermore, since the other end b of the diaphragm 13 can be securely held between the end 12c of the air chamber 12 and the cover 14, there is no concern about the strength of the assembled gas spring mechanism 10, and the product yield is improved. become.

  Since the convex portion 13a is caught on the end face of the upper end portion 14a of the cover 14, the convex portion 13a is formed by the step portion 12e between the end portion 12c of the air chamber 12 and the cylindrical portion 12b and the upper end of the cover 14. The diaphragm 13 can be more firmly fixed to the air chamber 12, and the convex portion 13 a can be fixed to the step portion 12 e of the air chamber 12 and the upper end portion 14 a of the cover 14. Since the state of being sandwiched between the air chamber 12 and the cover 14 can be easily confirmed, the other end b of the diaphragm 13 can be easily confirmed. There is also an advantage.

  Next, a diaphragm connection structure in another embodiment will be described. In the connection structure of the diaphragm in the other embodiment, since the confirmation means is only different from the connection structure of the diaphragm in the above-described embodiment, this different part will be described in detail, and in the embodiment The same members as those of the diaphragm connecting structure are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the diaphragm connection structure in another embodiment is embodied in the gas spring mechanism 10 of the shock absorber 1 in the same manner as the diaphragm connection structure in one embodiment.

  In the diaphragm coupling structure according to the other embodiment, the convex portion 13a of the diaphragm 13 is hooked on the fixed band 14b provided on the inner periphery of the upper end portion 14a of the cover 14. .

  Therefore, in this case, when the diaphragm 13 is connected to the air chamber 12, the convex portion 13a provided on the other end b of the diaphragm 13 is caught by the upper end surface in FIG. 3 of the fixed band 14b provided on the cover 14. The diaphragm 13 cannot be returned from the folded state by the restoring force to return to the original cylindrical state, and the other end b is maintained in a state of being covered with the end 12c of the air chamber 12, The cover 14 is inserted into the upper end portion 14a.

  The other end b of the diaphragm 13 is pressed against the annular recess 12d of the end portion 12c of the air chamber 12 by a fixed band 14b provided on the inner periphery of the upper end portion 14a of the cover 14, and the cover is passed through the fixed band 14b. 14 and the end 12 c of the air chamber 12.

  Therefore, even in the diaphragm connection structure in this other embodiment, when the diaphragm 13 is connected, the other end b of the diaphragm 13 is caught by the fixing band 14b of the cover 14 and the other end b of the other end b. Without being disengaged from the end 12c of the air chamber 12, and the other end b of the diaphragm 13 is securely covered with the end 12c of the air chamber 12, and the fixing band 14b of the end 12c of the air chamber 12 and the cover 14 is secured. It will be pinched by.

  Therefore, also in this embodiment, the other end b of the diaphragm 13 is securely sandwiched between the end portion 12c of the air chamber 12 and the fixing band 14b of the cover 14 in a state where the end portion 12c of the air chamber 12 is covered. Therefore, the assembling work of the diaphragm 13 becomes very simple.

  Furthermore, since the other end b of the diaphragm 13 can be securely held between the end 12c of the air chamber 12 and the cover 14, there is no concern about the strength of the assembled gas spring mechanism 10, and the product yield is improved. become.

  In addition, although the above-mentioned convex part 13a is made into a bowl shape over the perimeter of the outer periphery of the other end b of the diaphragm 13, as long as there exists an above-described effect, it is provided in a part of outer periphery of the other end b. Further, a plurality of convex portions may be arranged side by side in the circumferential direction of the outer periphery.

  This is the end of the description of the present invention, but it goes without saying that the scope of the present invention is not limited to the details shown or described.

1 is a partially cutaway side view of a shock absorber to which a diaphragm connection structure according to an embodiment is applied. It is a side view of the diaphragm to which the connection structure of the diaphragm in one embodiment is applied. It is a partially cutaway side view of a shock absorber to which a diaphragm connection structure in another embodiment is applied. It is a partially cutaway side view of a shock absorber to which a conventional diaphragm connection structure is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Buffer 2 Cylinder 3 Piston rod 10 Gas spring mechanism 11 Air piston 11a Bottom part 11b Cylindrical part 11c Opening part 12 Air chamber 12a Top part 12b Cylindrical part 12c End part 12d Annular recessed part 12e Step part 13 Diaphragm 13a Convex part 14 Cover 14a Upper end portions 14b and 17 Fixed band 15 Air chamber 16 Pipe joint a One end of the diaphragm b The other end of the diaphragm

Claims (2)

One end of the cylindrical diaphragm is connected to a cylindrical air piston coupled to the outer periphery of the shock absorber cylinder, and the other end of the diaphragm is connected to the cylindrical cover and the shock absorber piston rod in a folded state. in the coupling structure of the diaphragm is sandwiched comprising between air piston than large diameter tubular air chamber which Rutotomoni end is inserted into the cover, Ru provided a convex portion caught by the cover to the other end periphery of the diaphragm In addition , the diaphragm connecting structure is characterized in that the convex portion is sandwiched between the end portion of the air chamber and the end surface of the upper end portion of the cover . The diaphragm connecting structure according to claim 1, wherein the other end of the diaphragm is pressed against the annular recess of the air chamber by a fixing band provided on the inner periphery of the cover .

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