JP2018071602A - Lower cushion rubber for upper support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide lower cushion rubber for an upper support having a novel structure which can prevent the generation or the like of noise caused by the intrusion of foreign matters and the rubbing of an external peripheral cover part with the other member by preventing the strain deformation of the external peripheral cover part.SOLUTION: In lower cushion rubber 14 for an upper support having a cylindrical main body part 18 which is interposed between a vehicle body panel 46 and a cup metal fixture 52 in a state of being inserted into the cup metal fixture 52 which is attached to a piston rod 44 at a lower part of the vehicle body panel 46, and attached to a vehicle, an annular cover part 38 protruding to an external peripheral side is integrally formed at a cylinder main body part 18, the annular cover part 38 is arranged in a position apart from an opening end part of the cup metal fixture 52 to an upper part in a state of being attached to a vehicle, an external peripheral cover part 40 extending to a lower part is integrally formed at the annular cover part 38, and the external peripheral cover part 40 is externally fit to the cup metal fixture 52 in a state of being attached to the vehicle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lower cushion rubber for an upper support that provides vibration-proof coupling between a piston rod of a shock absorber and a vehicle body panel of a vehicle suspension mechanism.

  Conventionally, the upper support has been used as a vibration isolator that reduces vibrations transmitted from the piston rod on the road surface side to the vehicle body panel by connecting the piston rod of the shock absorber in the vehicle suspension mechanism to the vehicle body panel. It has been known. For example, as disclosed in Japanese Patent No. 5860733 (Patent Document 1), the upper support is disposed between an upper mounting bracket where the upper cushion rubber is positioned with respect to the upper surface of the vehicle body panel and the piston rod. And the lower cushion rubber is disposed between the lower surface of the vehicle body panel and the lower mounting bracket fixed to the piston rod, and the piston rod is connected to the vehicle body via an upper support having an upper cushion rubber and a lower cushion rubber. Anti-vibration connection to the panel.

  Incidentally, the lower cushion rubber of the upper support described in Patent Document 1 includes a cylindrical rubber main body portion that is externally inserted into the piston rod, and substantially protrudes radially outward from the outer peripheral surface of the rubber main body portion. An annular plate-like rubber flange portion and a cylindrical rubber cover portion extending downward from the outer peripheral end portion of the rubber flange portion are integrally provided. When the upper support is mounted on the vehicle, the lower part of the rubber body is fitted into the lower mounting bracket, and the lower end of the rubber cover is fixed to the lower mounting bracket. It is arranged in an extrapolated state with respect to the metal fittings, and by setting a narrowed area where the gap between the rubber cover part and the mounting bracket for the dust cover is reduced, rainwater and the like can penetrate through the narrowed area. Is preventing.

  Further, in the lower cushion rubber shown in Patent Document 1, the flange-shaped rubber flange portion is vertically overlapped with the opening end portion of the lower mounting bracket, and the upper end portion of the lower mounting bracket is interposed via the rubber flange portion. The amount of relative displacement between the piston rod and the vehicle body panel is limited in the vertical direction by contacting the vehicle body panel. In particular, in the embodiment of Patent Document 1, the upper end portion of the lower mounting bracket is in contact with the rubber flange portion when mounted on the vehicle.

  However, if the rubber flange is in contact with the upper end of the lower mounting bracket as in Patent Document 1, the rubber flange is pushed upward by the lower mounting bracket when a load is applied in the vertical direction, and the rubber cover is deformed. There is a risk of being harassed. In particular, when the input in the prying direction and the input in the vertical direction act simultaneously, the tip of the rubber cover part is deformed so as to be displaced toward the inner peripheral side on both sides in a specific radial direction, and the diameter orthogonal to the radial direction. On both sides in the direction, the tip of the rubber cover portion may be deformed so as to be displaced toward the outer periphery, and the tip portion of the rubber cover portion that is substantially circular in a stationary state may be deformed into a substantially elliptical shape. If such deformation occurs in the rubber cover part, there is a risk that abnormal noise may occur due to the tip of the rubber cover part being rubbed against other members such as a mounting bracket for the dust cover in the short axis direction of the deformed rubber cover part. On the other hand, in the major axis direction of the deformed rubber cover portion, the gap between the tip end portion of the rubber cover portion and the mounting bracket for the dust cover becomes large in the narrowed region, making it difficult to prevent water from entering.

Japanese Patent No. 5860733

  The present invention has been made in the background of the above-described circumstances, and its solution is to prevent distortion of the outer peripheral cover part, and to prevent abnormal noise from entering due to the intrusion of foreign matter or rubbing between the outer peripheral cover part and other members. It is an object of the present invention to provide a lower cushion rubber for an upper support having a novel structure capable of stably preventing the occurrence and the like.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, the first aspect of the present invention is a state in which the piston rod of the shock absorber constituting the suspension mechanism of the vehicle is extrapolated and inserted into the cup fitting attached to the piston rod below the vehicle body panel of the vehicle. A lower cushion rubber for an upper support having a cylindrical main body portion interposed between the vehicle body panel and the cup fitting and mounted on the vehicle, and protrudes outward from the cylindrical main body portion. An annular cover portion is integrally formed, and the annular cover portion is arranged at a position spaced upward from the opening end of the cup fitting when mounted on the vehicle. The outer peripheral cover portion extending downward is integrally formed, and the outer peripheral cover portion is extrapolated to the cup metal fitting when mounted on the vehicle. And butterflies.

  According to the lower cushion rubber for the upper support having the structure according to the first aspect of the present invention, the annular cover portion that covers the upper end of the opening end portion of the cup fitting and the outer peripheral side in the mounted state on the vehicle. By providing the outer peripheral cover portion, foreign substances such as water can be prevented from entering between the cylindrical main body portion inserted into the cup fitting and the cup fitting.

  Furthermore, in the state where the upper support is mounted on the vehicle, the annular cover portion is disposed at a position away from the opening end portion of the cup fitting upward, so that the annular cover portion is moved upward by the opening end portion of the cup fitting. It can be prevented from being pushed up. As a result, it is possible to prevent the outer peripheral cover portion from being deformed together with the annular cover portion. Invasion can be avoided. In addition, by avoiding contact between the opening end portion of the cup fitting and the annular cover portion, the annular cover portion can be prevented from being damaged by the edge of the opening end portion of the cup fitting.

  According to a second aspect of the present invention, in the lower cushion rubber for the upper support described in the first aspect, an outer peripheral step is formed on the outer peripheral surface of the cylindrical main body, and the outer peripheral step is provided to the vehicle. In the attached state, it is provided at a position overlapping the opening end of the cup fitting.

  According to the second aspect, when the upper support is mounted on the vehicle, the upper portion of the cylindrical main body portion above the outer peripheral step is disposed between the cup metal fitting and the vehicle body panel in the vertical direction. The approach displacement amount in the vertical direction of the opening end and the vehicle body panel is limited. As a result, the contact between the opening end of the cup fitting and the annular cover portion is more effectively prevented, and it is possible to prevent abnormal noise due to interference with the outer peripheral cover portion, cracks in the annular cover portion, and the like from occurring. In addition, it is possible to avoid the intrusion of foreign matter due to the wide gap between the cup fitting and the outer peripheral cover part.

  According to a third aspect of the present invention, in the lower cushion rubber for the upper support described in the first or second aspect, the outer peripheral cover portion is formed at the opening end portion of the cup metal fitting when mounted on the vehicle. The constricted region that restricts the passage of foreign matter is formed between the outer peripheral cover portion and the end flange.

  According to the third aspect, when the outer peripheral cover portion is extrapolated to the opening end portion of the cup fitting provided with the end flange in the mounting state on the vehicle, the gap between the outer peripheral cover portion and the cup fitting is narrowed. A constricted region is formed between the outer cover portion and the end flange. This makes it difficult for foreign matter such as water and dust entering from the lower opening of the outer cover to pass through the constricted area, and prevents foreign matter from entering between the bottom of the cylindrical body and the cup fitting. Is done.

  In addition, the outer peripheral cover portion is arranged closer to the entire peripheral wall portion of the cup fitting, and the outer peripheral cover is formed at the opening end portion of the cup fitting in which the end flange is formed, as compared with the case where the narrowed region is formed in a wide range. By forming the constricted region by locally approaching the cup fitting, the interference between the outer cover portion and the cup fitting due to deformation of the outer cover portion is less likely to occur. In particular, if the end flange is disposed in the middle in the vertical direction of the outer cover portion, the outer peripheral cover is larger than the case where the constriction region is formed by the tip portion of the outer cover portion where the displacement due to deformation increases. Interference with the cup fitting of the part is advantageously prevented.

  According to a fourth aspect of the present invention, in the lower cushion rubber for the upper support described in any one of the first to third aspects, a tapered cylindrical shape having a larger diameter as the outer peripheral cover portion goes downward. It is what has been.

  According to the 4th aspect, it becomes easy to extrapolate an outer periphery cover part with respect to a cup metal fitting. In particular, in the structure in which the opening end of the cup fitting is inserted in the upper and lower intermediate portions of the outer cover portion, the opening end of the cup fitting can be easily inserted at the lower end of the outer cover portion, and the outer cover In the upper and lower intermediate parts that are smaller in diameter than the lower end of the part, the opening end of the cup fitting can be made sufficiently close to the inner peripheral surface of the outer cover part, and the outer cover part and the opening end of the cup fitting It is possible to effectively prevent the passage of foreign matter in the constriction region formed between the two.

  According to a fifth aspect of the present invention, in the lower cushion rubber for an upper support described in any one of the first to fourth aspects, the lower portion of the cylindrical main body portion is inserted into the cup fitting, and the cup A metal fitting is attached to the cylindrical main body, and the outer peripheral cover is arranged in an extrapolated state on the cup metal fitting.

  According to the fifth aspect, the cylindrical main body portion is attached in a state of being inserted into the cup metal fitting, and the outer peripheral cover portion is arranged in a state of being externally inserted into the cup metal fitting, so that the lower portion and the outer peripheral cover portion are arranged. The passage of foreign matter is prevented between the cup fitting inserted between the radial directions and the outer cover portion.

  According to a sixth aspect of the present invention, in the lower cushion rubber for an upper support described in any one of the first to fifth aspects, the vehicle body panel and the annular cover portion are attached to the vehicle. It is arranged at the middle part in the vertical direction away from any of the opening ends of the cup fitting.

  According to the sixth aspect, in the state where the upper support is mounted on the vehicle, the annular cover portion is not only disposed at a position separated upward from the opening end portion of the cup fitting, but also with respect to the vehicle body panel. Since the vehicle body panel is tilted relative to the piston rod, it is possible to prevent the annular cover portion from being deformed due to contact with the vehicle body panel. As a result, it is possible to prevent the generation of abnormal noise or the intrusion of foreign matters due to the deformation of the outer peripheral cover portion accompanying the deformation of the annular cover portion.

  According to the present invention, by including the annular cover portion that covers the upper end of the opening end portion of the cup metal fitting and the outer peripheral cover portion that covers the outer peripheral side when mounted on the vehicle, between the lower cushion rubber and the cup metal fitting, etc. It can prevent foreign matter such as water from entering. Furthermore, when the upper support is mounted on the vehicle, the annular cover portion is arranged at a position away from the opening end of the cup fitting, so that the cup of the outer peripheral cover portion caused by the contact between the annular cover portion and the cup fitting. Interference with metal fittings and the like, and intrusion of foreign matter due to enlargement of the gap between the outer peripheral cover portion and the cup metal fitting can be avoided.

The longitudinal cross-sectional view which shows the upper support provided with the lower cushion rubber | gum as 1st embodiment of this invention in a vehicle mounting state. It is a longitudinal cross-sectional view of the lower cushion rubber which comprises the upper support shown in FIG. 1, Comprising: The figure corresponded in the II-II cross section in FIG. The top view of the lower cushion rubber shown in FIG. The bottom view of the lower cushion rubber shown in FIG. The figure which expands and shows the B section of FIG. The figure which expands and shows the A section of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an upper support 10 having a lower cushion rubber 14 as a first embodiment of the present invention in a state where it is mounted on a vehicle. The upper support 10 includes an upper cushion rubber 12 and a lower cushion rubber 14 that are arranged in an extrapolated state with respect to a piston rod 44 (described later) that constitutes a shock absorber of the vehicle. In the following description, the vertical direction means, in principle, the vertical direction in FIG. 1 that is the axial direction.

  More specifically, the upper cushion rubber 12 has a structure in which a substantially annular plate-shaped contact fitting 16 that is superimposed on a vehicle body panel 46 described later is vulcanized and bonded to the lower portion of a cylindrical rubber elastic body. doing. In FIG. 1, since the upper support 10 is shown in a mounted state on the vehicle, the upper cushion rubber 12 is compressed in the vertical direction.

  On the other hand, the lower cushion rubber 14 shown in FIGS. 2 to 4 includes a cylindrical main body 18 formed of a rubber elastic body. The cylindrical main body 18 has a substantially cylindrical shape as a whole, and includes an annular outer peripheral step 20 on the outer peripheral surface and an annular inner peripheral step 22 on the inner peripheral surface. In the present embodiment, the outer peripheral step 20 is located slightly above the inner peripheral step 22. However, the outer circumferential step 20 and the inner circumferential step 22 may be provided at the same position in the vertical direction, or the outer circumferential step 20 may be located below the inner circumferential step 22. Further, the radial width dimension of the outer peripheral step 20 is smaller than the radial width dimension of the inner peripheral step 22, and is set to be substantially the same as the thickness dimension of the peripheral wall portion of the cup fitting 52 described later.

  Furthermore, the upper side of the outer peripheral step 20 in the cylindrical main body 18 is an upper portion 24 positioned above the cup fitting 52 in the vehicle mounting state described later, and is higher than the outer peripheral step 20 in the cylindrical main body 18. The lower side is a lower portion 26 that is fitted in the cup fitting 52 in a vehicle mounting state, which will be described later. The cylindrical main body 18 has an upper portion 24 whose outer diameter is larger than that of the lower portion 26, and a portion of the upper portion 24 that protrudes to the outer periphery from the lower portion 26 and constitutes the outer circumferential step 20 is a stopper rubber portion 28. Yes. Further, a portion protruding from the lower side to the inner circumference from the lower side above the inner circumferential step 22 is a rod fitting portion 30 fitted into a piston rod 44 described later in an extrapolated state.

  Further, as shown in FIGS. 2 and 4, fitting protrusions 32 are formed on the lower portion 26 of the cylindrical main body 18 so as to protrude to the outer periphery at four locations in the circumferential direction. The lower portion 26 has a partially large diameter in the formation portion. As for this fitting convex part 32, the outer peripheral end surface which is a protrusion front end surface is located in the inner peripheral side rather than the outer peripheral surface of the upper part 24 provided with the stopper rubber part 28. FIG. Furthermore, in a portion where the fitting protrusion 32 is removed in the circumferential direction, a communication groove 34 that opens on the lower surface of the outer circumferential step 20 on both sides in the radial direction is formed to extend linearly in the radial direction. The lower portion 26 of the present embodiment has a tapered shape that increases in diameter as the lower end portion of the inner peripheral surface goes downward, and the lower end portion of the outer peripheral surface is at least at the portion where the fitting convex portion 32 is formed. It is made into the taper shape which becomes a small diameter as it goes below. In short, the lower portion 26 of the present embodiment is thinner in the radial direction as the lower end portion goes downward.

  2 and 3, the inner peripheral surface of the upper portion 24 has a corrugated cross section that alternately repeats a small diameter portion and a large diameter portion in the circumferential direction at least at the upper end portion. In the state of external fitting to the piston rod 44, the tightening allowance of the upper portion 24 with respect to the piston rod 44 is adjusted, and the spring characteristic of the upper portion 24 is adjusted.

  Further, the cylindrical main body portion 18 includes a protruding portion 36. As shown in FIGS. 3 and 5, the projecting portion 36 projects upward from the upper portion 24 of the cylindrical main body 18, and has a substantially constant cross-sectional shape that becomes narrower in the radial direction as it goes upward. It extends continuously. In addition, the protrusion part 36 of this embodiment exhibits a non-linear spring characteristic with respect to compression of an up-down direction because the radial direction width dimension changes in steps.

  An annular cover portion 38 is integrally formed at the upper end portion of the upper portion 24. As shown in FIGS. 2 and 4, the annular cover portion 38 has a thin and substantially annular plate shape, and extends from the cylindrical main body portion 18 to the outer peripheral side in a direction substantially perpendicular to the axis. In addition, since the protrusion part 36 of the cylindrical main-body part 18 is located above the upper surface of the cyclic | annular cover part 38, the cyclic | annular cover part 38 is a center part in the up-down direction of the cylindrical main-body part 18 rather than a center. It is arranged at a position biased upward.

  Further, an outer peripheral cover portion 40 is integrally formed at the outer peripheral end portion of the annular cover portion 38. The outer peripheral cover part 40 has a thin and substantially cylindrical shape larger in diameter than the cylindrical main body part 18, and is arranged so as to surround the cylindrical main body part 18. Further, the lower end, which is the projecting tip of the outer peripheral cover part 40, is located below the outer peripheral step 20 of the cylindrical main body part 18 and is located above the lower end of the lower part 26 of the cylindrical main body part 18. ing. In addition, the outer periphery cover part 40 of this embodiment is made into the taper cylinder shape which becomes a large diameter slightly as the whole goes downward, and goes down to the inner peripheral surface of the lower end part of the outer periphery cover part 40. Accordingly, a guide taper surface 42 having a large diameter is formed.

  As shown in FIG. 1, the upper support 10 having the upper cushion rubber 12 and the lower cushion rubber 14 is interposed between a piston rod 44 of a shock absorber constituting a vehicle suspension mechanism and a vehicle body panel 46 of the vehicle. Be dressed.

  That is, the upper cushion rubber 12 is fitted to the piston rod 44 in an extrapolated state, and the lower surface of the upper cushion rubber 12 constituted by the contact fitting 16 is superimposed on the upper surface of the vehicle body panel 46, and the upper cushion rubber. A substantially annular plate-shaped mounting bracket 48 superimposed on the upper surface of the piston 12 is inserted into the piston rod 44 and screwed to the upper end of the piston rod 44, and the upper cushion rubber 12 And is held between the axial directions. The upper cushion rubber 12 is attached to the vehicle while being compressed in the vertical direction between the mounting bracket 48 and the vehicle body panel 46. In addition, by adjusting the screwing position of the end nuts 50 and 50 with respect to the piston rod 44, the compression amount in the vertical direction of the upper cushion rubber 12 and the lower cushion rubber 14 can be appropriately set.

  On the other hand, the lower cushion rubber 14 has a tubular main body portion 18 fitted to the piston rod 44 in an extrapolated state, and the protruding portion 36 of the cylindrical main body portion 18 is pressed against the lower surface of the vehicle body panel 46 to protrude. The part 36 is compressed in the vertical direction.

  Further, the lower cushion rubber 14 is fitted into the cup fitting 52 at the lower portion 26 of the cylindrical main body 18 in the state of being mounted on the vehicle. The cup fitting 52 is a concave fitting that opens upward, and an insertion hole through which a piston rod 44 described later passes is formed through the center portion of the bottom wall portion in the vertical direction. An end flange 54 protruding toward the outer peripheral side is integrally formed at the opening end (upper end) of the metal fitting 52. When the lower cushion rubber 14 is mounted on a vehicle in which the entire lower portion 26 of the lower cushion rubber 14 is inserted into the inner peripheral side of the cup fitting 52 and the lower cushion rubber 14 is compressed in the vertical direction, The part 32 is fitted to the cup fitting 52. In other words, the cup fitting 52 is attached to the cylindrical main body portion 18 by fitting the cup fitting 52 to the portion where the fitting convex portion 32 is formed in the lower portion 26.

  A stopper support fitting 56 having a generally cup shape that is upside down is fixed to the cup fitting 52. The stopper support fitting 56 has an upper bottom wall portion provided with an insertion hole through which a piston rod 44, which will be described later, is inserted, overlapped with a bottom wall portion of the cup fitting 52, and a resin-made fixing portion 58 of the cup fitting 52. By fixing the outer peripheral surface to the outer peripheral surface of the stopper support fitting 56, the cup fitting 52 and the stopper support fitting 56 are connected. Further, a drain hole 60 penetrating the outer peripheral portion in the vertical direction is formed in the bottom wall portion of the cup fitting 52 and the upper bottom wall portion of the stopper support fitting 56, and the water that has entered the inner circumference of the cup fitting 52, etc. Is discharged downward through the discharge hole 60.

  Further, a dust cover 62 is fixed to the stopper support bracket 56. The dust cover 62 is a cylindrical member made of synthetic resin, is integrally formed with the fixing portion 58, and extends downward from the lower end portion of the stopper support fitting 56. Further, a bump stopper 64 is attached to the stopper support bracket 56. The bump stopper 64 has a cylindrical shape as a whole, and is formed with a constriction 66 whose outer diameter is partially reduced at a plurality of locations in the axial direction. The upper end of the bump stopper 64 is supported by the stopper support fitting 56 in an internally fitted state. The bump stopper 64 is made of an elastically deformable material, and in this embodiment is made of foamed urethane or the like.

  The piston rod 44 is inserted into the insertion hole in the bottom wall portion of the cup fitting 52 and the insertion hole in the upper bottom wall portion of the stopper support fitting 56, and an intermediate flange portion 68 provided in the axial middle of the piston rod 44 The cup metal 52 and the stopper support metal fitting are sandwiched between the intermediate nut 70 screwed to the middle of the piston rod 44 in the axial direction by sandwiching the bottom wall portion of the cup metal fitting 52 and the upper bottom wall portion of the stopper support metal fitting 56. 56 is attached to the piston rod 44. The intermediate nut 70 is accommodated in the inner hole of the lower portion 26 of the lower cushion rubber 14, and the inner circumferential step 22 is located above the intermediate nut 70. Further, the bump stopper 64 is arranged in an extrapolated state with a gap with respect to the piston rod 44, and the intermediate flange portion 68 is accommodated in the inner hole of the bump stopper 64.

  The upper cushion rubber 12 is compressed in the vertical direction by positioning the mounting bracket 48 in the axial direction with respect to the piston rod 44 in a state where the cup fitting 52 and the stopper support fitting 56 are fixed to the piston rod 44. Thus, the lower cushion rubber 14 is interposed between the vehicle body panel 46 and the cup metal member 52 in a state of being compressed in the vertical direction. Accordingly, the upper support 10 including the upper cushion rubber 12 and the lower cushion rubber 14 is mounted on the vehicle.

  In addition, in the mounting state on the vehicle, when the substantially entire lower portion 26 of the lower cushion rubber 14 is inserted into the cup fitting 52, the opening end of the cup fitting 52 is located with respect to the outer peripheral step 20 of the cylindrical main body 18. In the vertical direction, they are positioned at close overlapping positions. Furthermore, the fitting convex part 32 provided in the lower part 26 of the lower cushion rubber 14 is fitted by the cup metal fitting 52, and the part which removed the fitting convex part 32 in the circumferential direction in the lower part 26 of the lower cushion rubber 14 However, it is away from the inner peripheral surface of the cup fitting 52 toward the inner peripheral side.

  In such a state where the upper support 10 is mounted on the vehicle, the annular cover portion 38 protruding from the cylindrical main body portion 18 of the lower cushion rubber 14 is located in the middle of the vehicle body panel 46 and the cup fitting 52 in the vertical direction. . As a result, the vehicle body panel 46 and the cup fitting 52 are arranged apart from each other in the vertical direction, and an upper space 72 is provided above the annular cover portion 38 and a lower portion is provided below the annular cover portion 38. A space 74 is provided. In the present embodiment, since the annular cover portion 38 is integrally formed with the upper end portion of the upper portion 24 positioned above the cup fitting 52, it is closer to the vehicle body panel 46 than the opening end portion of the cup fitting 52 in the vertical direction. The vertical dimension of the lower space 74 is larger than the vertical dimension of the upper space 72.

  Further, the cylindrical outer cover portion 40 extending downward from the annular cover portion 38 is intermediate in the axial direction with respect to the end flange 54 formed at the open end portion of the cup fitting 52 as shown in FIG. The part is disposed in an extrapolated state. A gap between the outer peripheral cover portion 40 and the cup fitting 52 in the radial direction is narrowed at an extrapolated portion to the end flange 54 of the outer peripheral cover portion 40, and the constricted region is water from below to above. The stenosis region 76 restricts the passage of foreign matter. Furthermore, the lower end of the outer periphery cover part 40 is located above the lower end of the cup fitting 52. The outer peripheral cover portion 40 of the present embodiment has a slightly larger diameter as a whole downward, and a guide taper in which the inner peripheral surface of the lower end portion has a larger diameter downward with a larger inclination angle. By being the surface 42, it is possible to easily extrapolate the end flange 54 of the cup fitting 52. Further, in the present embodiment, the inner peripheral surface of the outer peripheral cover portion 40 is disposed opposite to the outer periphery with respect to the end flange 54, and the inner peripheral surface of the outer peripheral cover portion 40 and the outer peripheral end surface of the end flange 54 are arranged. A constriction region 76 is formed by the gap between the radial directions.

  In the state where the upper support 10 shown in FIG. 1 is mounted on the vehicle, when vertical vibrations are input, the vibrations of the upper cushion rubber 12 and the lower cushion rubber 14 are elastically deformed, such as vibration damping action and insulation action. The effect is demonstrated.

  According to the lower cushion rubber 14 having the structure according to this embodiment, the upper side of the cup fitting 52 is covered by the annular cover portion 38 and the outer peripheral side of the cup fitting 52 is covered by the outer peripheral cover portion 40. Therefore, even if rain water, dust, or the like is sprayed from the upper side or the outer peripheral side, entry of the cup fitting 52 into the inner peripheral side is prevented.

  In addition, in the present embodiment, the end flange 54 protruding to the outer periphery is formed at the opening end portion of the cup fitting 52, and the outer peripheral cover portion 40 is extrapolated to the end flange 54. A narrowed region 76 in which the gap between the cup fittings 52 is locally narrowed in the axial direction is formed between the outer peripheral cover portion 40 and the end flange 54 in the radial direction. As a result, the outer cover portion 40 and the cup fitting 52 can be easily placed close enough to each other in the constriction region 76, so that foreign matters such as water and dust entering from the lower opening of the outer cover portion 40 can cause the constriction region 76 to enter. It is more difficult to pass through and foreign matter can be prevented from entering between the lower portion 26 and the cup fitting 52.

  In addition, since the annular cover portion 38 is disposed at a position away from the opening end portion of the cup fitting 52, the annular cover portion 38 is disposed at the opening end of the cup fitting 52 at the time of vertical vibration input. It is possible to avoid deformation by being pushed up by the portion. As a result, unintended deformation such as ovalization of the outer peripheral cover 40 due to deformation of the annular cover 38 can be prevented, interference with other members of the outer peripheral cover 40, and the outer cover 40 and the end flange 54 can be prevented. It is possible to prevent a decrease in the function of preventing water from entering due to an increase in the gap.

  In addition, since the outer peripheral cover portion 40 is brought close to the cup fitting 52 at a part in the axial direction (the opening end provided with the end flange 54) to form the narrowed region 76 having a small axial dimension, Compared with the case of making it approach as a whole, interference between the outer peripheral cover part 40 and the cup fitting 52 due to deformation of the outer peripheral cover part 40 is less likely to occur. In particular, since the end flange 54 is inserted in the vertical intermediate portion of the outer cover portion 40 in a state of being inserted, compared with the case where the constriction region 76 is configured by the tip portion of the outer cover portion 40 where the amount of displacement due to deformation increases. Thus, interference of the outer peripheral cover portion 40 with the cup fitting 52 is more advantageously prevented.

  Further, in the present embodiment, the stopper rubber portion 28 of the cylindrical main body portion 18 is inserted between the opening end portion of the cup fitting 52 and the axial direction of the vehicle body panel 46, and the axial direction of the cup fitting 52 relative to the annular cover portion 38. The approach displacement amount is limited by the stopper rubber portion 28. As a result, the cup fitting 52 does not contact the annular cover portion 38 even when vibration is input in the vertical direction, and the annular cover portion 38 and the outer cover portion 40 are deformed by the annular cover portion 38 being pushed up by the cup fitting 52. Is prevented. In addition, by avoiding contact between the opening end of the cup fitting 52 and the annular cover portion 38, the annular cover portion 38 can be prevented from being damaged by the edge of the opening end portion of the cup fitting 52.

  In addition, since the outer peripheral cover portion 40 has a tapered cylindrical shape that increases in diameter as it goes downward, the outer cover portion 40 is extrapolated to the cup fitting 52 when the lower cushion rubber 14 is attached to the cup fitting 52. It is easy to arrange with. In particular, since the end flange 54 is inserted in the upper and lower intermediate portions of the outer cover portion 40, the end flange 54 can be easily inserted into the inner periphery of the outer cover portion 40, and the outer cover portion. The outer peripheral end surface of the end flange 54 can be made sufficiently close to the inner peripheral surface of the outer peripheral cover portion 40 at the upper and lower intermediate portions that have a smaller diameter than the lower end portion of the outer peripheral portion 40. Accordingly, it is possible to effectively prevent the passage of foreign matters in the narrowed region 76 between the outer peripheral cover portion 40 and the end flange 54 while improving the workability of assembling the lower cushion rubber 14 and the cup fitting 52.

  In addition, in the present embodiment, the inner peripheral surface of the lower end portion of the outer peripheral cover portion 40 is the guide taper surface 42 that expands downward, so that the end flange 54 can be easily formed by the outer peripheral cover portion 40. Insertion is possible, and the assembly work of the lower cushion rubber 14 and the cup fitting 52 becomes easier. In addition, since the guide taper surface 42 is provided at a position that deviates downward from the constituent portion of the constriction region 76 in the outer peripheral cover 40, the guide taper surface 42 affects the function of preventing foreign matter from entering the constriction region 76. Does not affect.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the outer peripheral cover portion 40 extends below the cup fitting 52 to form a constricted region that restricts the passage of foreign matters such as water and dust between the outer peripheral cover portion 40 and the stopper support fitting 56. it can. In such a case, the end flange 54 of the cup metal fitting 52 is not essential and can be omitted, and the protrusion size to the outer periphery can be made smaller and arranged far away from the outer cover portion 40. good.

  The outer peripheral step 20 is not essential and can be omitted. In this case, the stopper rubber portion 28 can also be omitted. In such a structure in which the stopper rubber portion 28 is not formed, when the cylindrical main body portion 18 is compressed up and down, the upper portion 24 of the cylindrical main body portion 18 bulges toward the outer peripheral side and the opening end portion of the cup fitting 52 and the vehicle body By entering between the upper and lower directions of the panel 46, the same displacement limiting function as that of the stopper rubber portion 28 can be exhibited.

10: Upper support, 14: Lower cushion rubber, 18: Cylindrical main body, 20: Outer peripheral step, 24: Upper part, 26: Lower part, 36: Projection part, 38: Annular cover part, 40: Outer cover part, 44: Piston rod, 46: body panel, 52: cup fitting, 54: end flange, 72: upper space, 74: lower space, 76: constriction area

Claims (6)

It is extrapolated to a piston rod of a shock absorber that constitutes a suspension mechanism of the vehicle, and is inserted between a cup fitting attached to the piston rod below the vehicle body panel of the vehicle, between the vehicle body panel and the cup fitting. A lower cushion rubber for an upper support having a cylindrical main body part that is interposed and attached to a vehicle,
An annular cover portion projecting outward is integrally formed on the cylindrical main body portion, and the annular cover portion is disposed at a position away from the opening end portion of the cup fitting when mounted on the vehicle. As well as
The upper cover is integrally formed with an outer peripheral cover portion extending downward in the annular cover portion, and the outer peripheral cover portion is externally attached to the cup fitting when mounted on the vehicle. Under cushion rubber.   2. The upper according to claim 1, wherein an outer peripheral step is formed on an outer peripheral surface of the cylindrical main body, and the outer peripheral step is provided at a position overlapping with an opening end of the cup fitting when mounted on the vehicle. Lower cushion rubber for support.   The outer peripheral cover portion is extrapolated to an end flange formed at the opening end portion of the cup fitting in a state of being mounted on the vehicle, and a constricted region that restricts the passage of foreign matter is defined as the outer peripheral cover portion. The lower cushion rubber for an upper support according to claim 1 or 2, wherein the lower cushion rubber is configured between the end flanges.   The lower cushion rubber for an upper support according to any one of claims 1 to 3, wherein the outer cover portion has a tapered cylindrical shape having a larger diameter as it goes downward.   The lower part of the said cylindrical main-body part is inserted in the said cup metal fitting, this cup metal fitting is attached to this cylindrical main-body part, and the said outer periphery cover part is distribute | arranged to the said cup metal fitting in the extrapolated state. The lower cushion rubber for upper support as described in any one of -4.   The said annular cover part is arrange | positioned in the intermediate part of the up-down direction away from any of the said vehicle body panel and the opening edge part of the said cup metal fitting in the mounting state to the said vehicle. The lower cushion rubber for an upper support according to any one of the above items.

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