JP4768563B2 - Stopper structure - Google Patents

Description

  The present invention relates to a stopper structure, and more particularly, to an improvement in a stopper structure suitable for implementation when a bracket is fixedly connected to the outer periphery of a bottom portion, which is a lower end portion of a shock absorber body, using a stopper.

  In a hydraulic shock absorber constituting a suspension mechanism in a vehicle, the shock absorber main body is often connected to the wheel side under the use of the bracket. Therefore, various brackets have been proposed so far. There are various proposals for a connection structure that connects the bracket to the outer periphery of the bottom portion, which is the lower end portion of the shock absorber body.

  Among these, for example, Patent Document 1 discloses a proposal of a connection structure for connecting a knuckle bracket to the outer periphery of a bottom portion of a shock absorber body constituting a strut type hydraulic shock absorber.

  That is, in this connection structure, the bottom portion, which is the lower end portion of the shock absorber body that has been drawn and reduced in diameter, is inserted inside the knuckle bracket, and in this state, the upper end and the lower end of the knuckle bracket are respectively connected to the outer periphery of the bottom portion. It is supposed to be welded.

Therefore, in the case of the proposal disclosed in Patent Document 1, it is possible to firmly connect the knuckle bracket to the outer periphery of the bottom portion of the shock absorber body. In particular, the shock absorber body is a strut type hydraulic shock absorber. It will be suitable for use when configuring.
JP 2002-195330 (see paragraphs 0004, 0009, 0017, 0025, 0031, 0041, FIGS. 7, 8, and 12 in the specification)

  However, in the proposal disclosed in Patent Document 1 described above, there is no particular problem when this is embodied in a strut-type hydraulic shock absorber that is a so-called shaft member. It may be pointed out that it is not suitable for implementation in a shock absorber.

  That is, for connecting the knuckle bracket as the bracket to the shock absorber body in the strut type hydraulic shock absorber as the shaft member, since it is important that the knuckle bracket is firmly connected, it is preferable that welding is frequently used. The knuckle bracket is also formed so as to have substantially the same thickness as that of the cylindrical body forming the bottom portion of the shock absorber body, and is set to be welded.

  On the other hand, when the bracket connected to the shock absorber body in the hydraulic shock absorber configured not to be a shaft member is a cast product having a certain mechanical strength, the cast product and the shock absorber body are Form the shock absorber body because there is a difference in the material between the forged product that is the cylindrical body to be formed, or the wall thickness of the cylinder forming the shock absorber body may be inferior to the thickness of the bracket It is not easy to weld the bracket to the cylindrical body, and there is a problem that the workability is inferior.

  Therefore, the present invention was created in view of such a current situation, and the object of the present invention is basically the bottom portion of the shock absorber body in the hydraulic shock absorber configured not to be a shaft member. When connecting the bracket to the shock absorber body, it is possible to connect it by using a stopper having a predetermined mechanical strength without directly welding the bracket to the shock absorber body. As a result, the versatility of the hydraulic shock absorber is improved. It is to provide a stopper structure that is optimal for expecting the above.

  In order to achieve the above object, the stopper structure according to the present invention basically has a large upper portion where the stopper formed in a cylindrical shape that allows the shock absorber body to be present inside is located above the middle portion. The upper end of the bracket is fixedly connected to the outer periphery of the bottom portion of the shock absorber body at the lower end of the small diameter portion of the stopper and the lower portion of the shock absorber body with the lower portion being lower than the intermediate portion while being a diameter portion. In the stopper structure formed by abutting, the stopper has an inclined surface that converges with the inner peripheral surface of the intermediate portion facing downward, and this inclined surface is formed on the outer peripheral surface of the cylinder forming the shock absorber body. Suppose that it is matched to the surface.

  Therefore, in the present invention, the stopper has a large diameter because the inner peripheral surface of the intermediate portion composed of the inclined surface converging downward is matched with the inclined surface formed on the outer peripheral surface of the cylindrical body of the shock absorber body. When the inner diameter of the cylindrical portion and the small diameter portion is so-called coincident with the outer diameter of the cylinder in the shock absorber body, the small diameter portion having a smaller diameter than the intermediate portion in the stopper can pass through the portion having the inclined surface in the shock absorber main body. That is, the portion having the inclined surface in the shock absorber body prevents passage of the intermediate portion and the small diameter portion in the stopper.

  At this time, the intermediate portion and the small-diameter portion of the stopper are the entire circumference, and the intermediate portion and the small-diameter portion, which are the entire circumference, match the inclined surface formed by the entire circumference of the shock absorber body, so that the stopper has a predetermined mechanical strength. The connection state of the bracket whose upper end is brought into contact with the lower end while having the lower end in the shock absorber body can be ensured.

  As a result, the load acting on the shock absorber main body from above increases, so that the bracket pushes down the bracket connected to the bottom portion of the shock absorber main body, that is, the bracket pushes the stopper upward. Even in this case, the stopper is fixed to the outer periphery of the shock absorber main body, and the connection state of the bracket to the bottom portion of the shock absorber main body is ensured.

  Hereinafter, the present invention will be described based on the illustrated embodiment. The stopper structure according to the present invention is embodied as a hydraulic shock absorber having a bracket 2 on a shock absorber body 1. The main body 1 is not configured as a shaft member such as a strut type.

  At this time, from the point of view of the present invention, it can be said that there is no problem as to whether the shock absorber body 1 is a single cylinder type or a double cylinder type. However, the stopper structure of the present invention is embodied. In this case, as will be described later, it is essential that the lower end side of the outer cylinder 11 which is the cylindrical body forming the shock absorber body 1 is partially reduced in diameter. Even if the diameter is put into practice, the shock absorber main body 1 formed in a double cylinder shape that is not affected by the operation of the internal structure is targeted.

  Further, in this hydraulic shock absorber, the bracket 2 connected to the bottom portion 1a of the shock absorber main body 1 which is the lower end portion of the outer cylinder 11 is disclosed in the above-mentioned Patent Document 1 from the viewpoint of the present invention. The knuckle bracket is not connected to the outer periphery of the bottom portion 1a of the shock absorber body 1 by welding, but is connected using a stopper 3 described later without using welding.

  In the illustrated embodiment, the bracket 2 is fixed to a predetermined position of the shock absorber main body 1 under a non-rotating and retaining structure such as a light press fit, and then the bottom of the shock absorber main body 1 is fixed. It is supposed to be connected to the outer periphery of the part 1a.

  Therefore, the bracket 2 shown in the figure has an upper end 2a formed in a split structure, and a bolt 31 penetrating a bolt receiving portion 2b formed integrally with the upper end 2a is also formed integrally with the upper end 2a. The upper end 2a is reduced in diameter by being screwed into the nut portion 2c, and is connected in a state of gripping the outer periphery of the bottom portion 1a of the shock absorber body 1.

  In the bracket 2, a main body 2d extending downward from the upper end 2a is formed in a bifurcated shape, and a double wishbone type suspension mechanism (not shown) is provided at each lower end 2e. It has a hole 2f for pivotally attaching the lower arm.

  By the way, the bracket 2 is connected to the outer periphery of the bottom portion 1a of the shock absorber main body 1 at the predetermined position, and is so-called against the stopper 3 which is previously disposed at the predetermined position of the shock absorber main body 1. It is supposed to be connected while aiming.

  This is because when the bracket 2 is connected to the outer periphery of the bottom portion 1a in the shock absorber body 1, it does not rotate in the circumferential direction on the outer periphery of the bottom portion 1a and does not move in the axial direction of the bottom portion 1a. That is, it is assumed that it does not fall off from the outer periphery of the bottom portion 1a.

  That is, as described above, the bracket 2 is connected to the outer periphery of the bottom portion 1a of the shock absorber main body 1 using a so-called bolt-nut structure. At this time, as shown in FIG. It is assumed that the bolt 31 screwed into 2c serves as a detent and a detent for the bottom portion 2a of the bracket 2.

  That is, on the outer periphery of the bottom portion 1a of the shock absorber main body 1, the outer cylinder 11 is recessed from the outside in a tangential direction to form a concave groove 11a, and the bolt 31 is present in the concave groove 11a. By doing so, it is said that the above-described detent and retaining are realized.

  As described above, the bracket 2 shown in the figure is connected to the outer periphery of the bottom portion 1a of the shock absorber main body 1, and includes the above-described concave groove 11a and the bolt 31 to prevent rotation and disconnection. Therefore, it is essential to realize so-called aiming for positioning with respect to the stopper 3 fixed in advance at a predetermined position.

  On the other hand, in the stopper structure according to the present invention, the stopper 3 is basically formed in a cylindrical shape that allows the shock absorber main body 1 to be present inside. Specifically, FIG. As shown also in FIG. 3, it is assumed that the upper portion above the intermediate portion 3a is a large-diameter portion 3b and the lower portion below the intermediate portion is a two-stage configuration having a small-diameter portion 3c. The upper end of the bracket 2 is in contact with the lower end of the bracket.

  Incidentally, in the stopper 3, the large diameter portion 3 and the small diameter portion 3 c are of course formed so that the inner diameters thereof coincide with the outer diameter of the outer cylinder 11 in the shock absorber body 1.

  In this stopper structure, the stopper 3 has an inclined surface 3d that converges with the inner peripheral surface of the intermediate portion 3a facing downward, and the inclined surface 3d of the outer cylinder 11 that forms the shock absorber body 1 is provided. It is assumed that it is matched with the inclined surface 11b formed on the outer peripheral surface (see FIGS. 2 and 3).

  By the way, although it is about the inclined surface 11b formed in the outer peripheral surface of the outer cylinder 11 which forms the buffer body 1, this inclined surface 11b may be positively formed for the realization of this invention. Of course, in the shock absorber main body 1 shown in the figure, a inevitably formed one is used.

  That is, in the illustrated embodiment, the outer cylinder 11 that forms the shock absorber body 1 is formed by reducing the diameter of a pipe body having an appropriate outer diameter by drawing, that is, the bracket 2 that is a ready-made product. Since the connection is made possible, the inclined surface 11b is inevitably formed.

  Therefore, in the present invention, the stopper 3 can exist with a predetermined mechanical strength by engaging the stopper 3 with the inclined surface 11b that is inevitably formed. For the purpose, it is assumed that the inevitably formed inclined surface 11b is used.

  From the above, although not shown, the stopper 3 is welded to, for example, the outer periphery of the outer cylinder 11 forming the shock absorber body 1 by forming an arc piece, and the upper end of the bracket 2 is connected to the lower end of the welded so-called stopper piece. In comparison with the configuration in which the load acting on the shock absorber body 1 from above is propagated to the bracket 2, the stopper 3 may be formed in a cylindrical shape. The stopper 3 can have sufficient mechanical strength.

  By the way, even if the stopper piece formed on the above-mentioned arc piece is improved so that it is so long that the outer cylinder 11 is made to make a half turn, the point is that it is within the range of the design change and how much is welded. However, it is clear that the mechanical strength is inferior to the case where it is formed in a cylindrical shape as in the present invention.

  As described above, the stopper 3 according to the present invention has the inner peripheral surface of the intermediate portion 3a as the inclined surface 3d, and the inclined surface 3d is formed on the inclined surface 11b formed in the outer cylinder 11 forming the shock absorber body 1. By matching, the intermediate portion 3a of the stopper 3 and the small-diameter portion 3c as the lower portion cannot pass through the portion having the inclined surface 11b. That is, the portion having the inclined surface 11b in the shock absorber body 1 is not provided. The passage of the intermediate portion 3a and the small diameter portion 3c in the stopper 3 is prevented.

  At this time, since the stopper 3 is formed in a cylindrical shape, the intermediate portion 3a and the small-diameter portion 3c described above have a full-circumference structure. Therefore, the intermediate portion 3a and the small-diameter portion 3c having the full-circumferential structure are composed of the shock absorber body 1. Since the stopper 3 has a predetermined mechanical strength, the bracket 2 is brought into contact with the bottom end of the shock absorber body 1 to the bottom portion 1a. The state can be guaranteed permanently.

  On the other hand, in this stopper structure, the stopper 3 has a protruding portion 3e protruding toward the upper end of the bracket 2 at the lower end of the small diameter portion 3a, and the upper end of the bracket 2 on the entire periphery of the lower end excluding the protruding portion 3e. (See FIGS. 1 and 2) On the other hand, as shown in FIG. 1, so-called alignment is practiced by projecting the projection 3e in the recess 2g formed in the upper end 2a of the bracket 2. I am trying to get it.

  Incidentally, the protrusion 3e is formed integrally with the lower end of the small-diameter portion 3c, but the point is that it is only necessary to be positioned in the recess 2g to enable so-called alignment. For example, in place of the above, although not shown, it is needless to say that the protruding portion 3e may be formed as a separate body from the stopper 3 and connected to the lower end portion of the stopper 3.

  The recess 2g is not positively formed on the upper end 2a of the bracket 2 as shown, but is formed from the structure of the bracket 2.

  That is, in the bracket 2 shown in the drawing, the upper end 2a is formed in a split structure as described above, and the upper end 2a formed in the split structure is tightened with a so-called bolt-nut structure. At this time, since there is a so-called gap in the upper end portion 2a, this gap is used as the above-described recess 2g. In this sense, in the present invention, the configuration is simplified because the recess 2g is not actively formed. There are benefits that you will get.

  Therefore, in this bracket 2, it is assumed that the stopper 3 is positioned at a so-called predetermined position with respect to the shock absorber body 1, but the lower end of the stopper 3 is formed in the recess 2 g formed in the upper end 2 a. By making the protruding portion 3e formed on the front side of the bracket 2, the bracket 2 can be positioned at a predetermined position.

  Next, in this stopper structure, the stopper 3 has protrusions 3f that are formed on the inner periphery of the large diameter portion 3b so as to protrude at equal intervals in the circumferential direction. When it is assumed that the protrusion 3f is inserted into the portion having the inclined surface 11b, the protrusion 3f is pressed against the outer periphery of the outer cylinder 11 in the shock absorber body 1.

  Thus, when the stopper 3 has the protrusion 3f on the inner periphery of the large-diameter portion 3b and the outer periphery of the outer cylinder 11 in the shock absorber main body 1 is tightly fitted, the stopper 3 is the shock absorber main body 1. In the state of being interposed on the outer periphery of the outer cylinder 11 in the above-described manner, it is possible to prevent so-called rattling, and to prevent a problem that the stopper 3 is easily displaced when the bracket 2 is connected later. It will be advantageous.

  And in this stopper structure, the stopper 3 has the hole 3g in the intermediate part 3a, this hole 3g is made into the notch for welding, and a weld bead is accommodated in this notch for welding. Thus, the outer periphery of the outer cylinder 11 in the shock absorber main body 1 and the stopper 3 can be welded.

  By the way, welding by the above-described weld bead, that is, welding of the outer periphery of the outer cylinder 11 and the stopper 3 in the shock absorber main body 1 is enabled, so that the stopper 3 can be said to be a predetermined position that is permanently disposed. However, as described above, the protrusion 3f is provided on the inner periphery of the large-diameter portion 3b, and the outer periphery of the outer cylinder 11 in the shock absorber body 1 is tightly fitted. Of course, this welding may be omitted.

1 is an elevation view showing a hydraulic shock absorber embodying a stopper structure according to the present invention. It is a partial expanded longitudinal cross-sectional view which shows the state with which the bracket is contact | abutted with the stopper with a shock absorber main body. It is a longitudinal cross-sectional view which expands and shows the stopper of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shock absorber body 2 Bracket 2g Recessed part 3 Stopper 3a Middle part 3b Large diameter part 3c Small diameter part 3d, 11b Inclined surface 3e Protruding part 3f Protruding part 3g Hole which is a notch for welding 11 Outer cylinder which is a cylinder

Claims (4)

A cylindrically formed stopper that allows the shock absorber main body to be present inside has a two-stage configuration in which the upper part above the intermediate part is the large diameter part and the lower part below the intermediate part is the small diameter part. In addition, in the stopper structure in which the upper end of the bracket fixedly connected to the outer periphery of the bottom portion of the shock absorber body is brought into contact with the lower end of the small diameter portion of the stopper, the stopper faces the inner peripheral surface of the intermediate portion downward. A stopper structure characterized in that the inclined surface is converged, and the inclined surface is matched with the inclined surface formed on the outer peripheral surface of the cylindrical body forming the shock absorber body. While the stopper is fixed at a predetermined position of the shock absorber body, the lower end of the small diameter portion has a protruding portion that protrudes toward the upper end of the bracket, and the upper end of the bracket is brought into contact with the entire periphery of the lower end excluding the protruding portion. The stopper structure according to claim 1, wherein the protruding portion is present in a recess formed at an upper end portion of the bracket. 2. The stopper structure according to claim 1, wherein the stopper has protrusions formed on the inner periphery of the large-diameter portion so as to protrude at equal intervals in the circumferential direction, and the protrusions are pressed against the outer periphery of the cylindrical body of the shock absorber body. . The stopper has a notch for welding at an intermediate portion, and the notch for welding serves as a receiving portion for a weld bead that enables welding of the outer periphery of the cylindrical body and the stopper in the shock absorber body. The stopper structure described in 1.

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