Vibration isolation device

Abstract

To provide a vibration-proof device capable of increasing heat insulation performance.SOLUTION: When a first member 11 is inserted into each of a first insertion hole 21a of a stopper 20 made of an elastic body and a second insertion hole 31b of a heat insulation cover 30, the stopper 20 is disposed in a side of a mount edge 14d of a second member 15, and the heat insulation cover 30 overlaps with one portion of the side of the mount edge 14d of the stopper 20. Heat from a side of a mated member 2 to a vibration-proof substrate 18 can be insulated easily due to the overlapping portion, thus increasing heat insulation performance. Further, an inner peripheral surface of the second insertion hole 31b of the heat insulation cover 30 is elastically fitted to an outer peripheral surface of the first member 11, thus preventing the heat insulation cover 30 and the stopper 20 from being easily omitted from the first member 11.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vibration isolation device, and particularly to a vibration isolation device capable of improving heat insulation performance.

Background Art

[0002] Patent Document 1 describes a vibration isolation device in which an axial first member and an inner peripheral surface of a cylindrical second member are connected by a vibration isolation base made of an elastic body, and an elastic body is provided between a mating member to which one axial end of the first member is attached and the second member. A stopper is disposed. In Patent Document 1, the stopper is attached to the first member by elastically fitting (fitting with an interference fit) the outer peripheral surface of the first member to the inner peripheral surface of the insertion hole provided in the stopper.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the vibration isolation device in the conventional technology receives radiant heat or the like from the mating member side, the heat heading toward the vibration isolation base can be blocked to some extent by the stopper, and the thermal degradation of the vibration isolation base can be suppressed. However, depending on the amount of heat, the heat insulation performance may be insufficient.

[0005] The present invention has been made to solve the above-described problems, and an object thereof is to provide a vibration isolation device capable of improving heat insulation performance.

Means for Solving the Problems

[0006] To achieve this object, the vibration isolator of the present invention includes a shaft-shaped first member having a mounting end, which is one end in the axial direction, attached to a mating member, a cylindrical second member surrounding the first member, a vibration isolation base made of an elastic body connecting the first member and the inner peripheral surface of the second member, an elastic stopper having a first insertion hole into which the first member is inserted and disposed on the mounting end side of the second member to restrict the movement of the mating member, and a heat shield cover having a second insertion hole into which the first member is inserted and overlapping a part of the mounting end side of the stopper. The inner peripheral surface of the second insertion hole elastically fits onto the outer peripheral surface of the first member.

Advantages of the Invention

[0007] According to the vibration isolator described in claim 1, the first member is inserted into the first insertion hole of the elastic stopper and the second insertion hole of the heat shield cover, so that the stopper is disposed on the mounting end side of the second member, and the heat shield cover overlaps a part of the mounting end side of the stopper. This overlapping part can easily block the heat from the mating member side toward the vibration isolation base. Furthermore, since the stopper and the heat shield cover are separate members, for example, the stopper can be made of a material suitable for restricting the movement of the mating member, while the heat shield cover can be made of a material with high heat shielding performance. As a result, the heat shielding performance against the heat from the mating member side toward the vibration isolation base can be improved.

[0008] Furthermore, since the inner peripheral surface of the second insertion hole of the heat shield cover elastically fits (fits with an interference fit) onto the outer peripheral surface of the first member, it is difficult for the heat shield cover to fall off from the first member, and it is also difficult for the stopper overlapping the second member side of the heat shield cover to fall off from the first member. This makes it easier to manage the parts of the vibration isolator during transportation until the mounting end is attached to the mating member.

[0009] According to the vibration isolator described in claim 2, in addition to the effects achieved by the vibration isolator described in claim 1, the following effect is achieved. The inner peripheral surface of the first insertion hole fits onto the outer peripheral surface of the first member with a clearance fit (without an interference fit). This makes it easier to insert the first member into the first insertion hole, that is, it makes it easier to attach the stopper to the first member.

[0010] According to the vibration isolator described in claim 3, in addition to the effects exhibited by the vibration isolator described in claim 1 or 2, the following effects are achieved. The insertion portion of the first member inserted into the first insertion hole and the second insertion hole has an outer peripheral surface that is continuous via a ridge line to the mounting end and is formed in a cylindrical surface shape. In either the insertion portion or the first insertion hole, a first recess that is recessed in a part of the circumferential direction extends in the axial direction, and a first protrusion is formed on the other thereof. By fitting the first recess and the first protrusion, rotation of the stopper with respect to the first member (insertion portion) can be restricted.

[0011] According to the vibration isolator described in claim 4, in addition to the effects exhibited by the vibration isolator described in claim 3, the following effects are achieved. The stopper includes a thick portion that protrudes toward the mating member. When restricting the movement of the mating member by the stopper, the amount of deformation of the thick portion increases, but in the region on the opposite side of the thick portion across the axial center of the insertion portion, it is less likely to be affected by the deformation of the thick portion. Since the first recess and the first protrusion fit in this region, it is possible to suppress the disengagement of the fit between the first recess and the first protrusion as the thick portion deforms.

[0012] According to the vibration isolator described in claim 5, in addition to the effects exhibited by the vibration isolator described in any one of claims 1 to 4, the following effects are achieved. The heat shield cover includes an outer end surface facing the mounting end side in the axial direction, and a wall that rises from the outer end surface and is disposed at least in a part of the circumferential direction with respect to the first member. Since the heat radiating from the radially outer side toward the first member can be blocked by this wall, it is possible to suppress the heat from being transmitted to the vibration isolation base through the first member. As a result, the heat shielding performance against the heat from the mating member side and the radially outer side toward the vibration isolation base can be further improved.

[0013] According to the vibration isolator described in claim 6, in addition to the effects exhibited by the vibration isolator described in claim 5, the following effects are achieved. The heat shield cover includes ribs that rise from the outer end surface and the wall and reinforce the wall. Since the ribs can make the wall difficult to collapse, it is easier to exhibit the effect of improving the heat shielding performance by the wall.

[0014] According to the vibration isolator described in claim 7, in addition to the effects achieved by the vibration isolator described in claim 6, the following effects are achieved. The rib rises from the outer surface of the wall on the side opposite to the first member. Compared with the case where the rib is provided on the inner surface of the wall on the first member side, the wall can be arranged closer to the first member, and it is easier to block the heat heading towards the first member with the wall. As a result, the heat insulation performance against the heat coming from the mating member side and the radially outer side towards the vibration isolation base can be further improved.

[0015] According to the vibration isolator described in claim 8, in addition to the effects achieved by the vibration isolator described in any one of claims 5 to 7, the following effects are achieved. The stopper includes a thick portion that protrudes towards the mating member. The thick portion is located on the side opposite to the wall with the first member interposed therebetween. Since the thick portion and the wall can surround most or all of the periphery of the first member, the heat heading towards the first member can be blocked more effectively. As a result, the heat insulation performance against the heat coming from the mating member side and the radially outer side towards the vibration isolation base can be further improved.

[0016] According to the vibration isolator described in claim 9, in addition to the effects achieved by the vibration isolator described in any one of claims 1 to 8, the following effects are achieved. The insertion portion of the first member inserted into the first insertion hole and the second insertion hole has an outer peripheral surface that is continuous via a ridge line to the mounting end and is formed in a cylindrical surface shape. In either the insertion portion or the second insertion hole, a second recess that recesses a part in the circumferential direction extends in the axial direction, and a second protrusion is formed on the other thereof. The rotation of the heat insulation cover with respect to the first member (insertion portion) can be restricted by the fitting of the second recess and the second protrusion.

[0017] In addition, when the second recess is formed in the insertion portion and the first recess is formed in the insertion portion as described in claim 3, the first recess and the second recess may be the same. Similarly, when the second protrusion is formed in the insertion portion and the first protrusion is formed in the insertion portion as described in claim 3, the first protrusion and the second protrusion may be the same.

[0018] According to the vibration isolator described in claim 10, in addition to the effects achieved by the vibration isolator described in claim 9, the following effects are achieved. The stopper includes a thick portion that protrudes toward the mating member. The thick portion includes a first thick portion and a second thick portion that is lower in height than the first thick portion. In a state where the second recess and the second protrusion are fitted together, the heat shield cover is disposed adjacent to the second thick portion in the circumferential direction. Here, when the heat shield cover rotates with respect to the first member, the heat shield cover may cover the low second thick portion. However, since the rotation of the heat shield cover is restricted by the fitting of the second recess and the second protrusion, it is possible to make it difficult for the heat shield cover to cover the second thick portion.

[0019] According to the vibration isolator described in claim 11, in addition to the effects achieved by the vibration isolator described in claim 9 or 10, the following effects are achieved. The heat shield cover includes an outer end face facing the attachment end side in the axial direction and a wall that rises from the outer end face and is disposed at least partially in the circumferential direction with respect to the first member. Since the heat toward the first member can be blocked by this wall, it is possible to suppress the heat from being transmitted to the vibration isolation base through the first member. As a result, the heat insulation performance against the heat from the mating member side and the radially outer side toward the vibration isolation base can be further improved.

[0020] Furthermore, due to the rising of the wall from the outer end face, the rigidity of the heat shield cover between the wall and the second insertion hole is increased. Since the second recess and the second protrusion are fitted in the region where the rigidity is increased, deformation in the vicinity of the second recess or the second protrusion provided in the heat shield cover can be suppressed, and the fitting of the second recess and the second protrusion can be made difficult to come off.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Best Mode for Carrying Out the Invention

[0022] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of the vibration isolator 10 in the first embodiment. FIG. 2 is a plan view of the vibration isolator 10. FIG. 3 is a cross-sectional view of the vibration isolator 10 taken along line III-III in FIG. 2. In this embodiment, an engine mount will be described as an example of the application target of the vibration isolator 10.

[0023] As shown in FIG. 3, the vibration isolator 10 includes a shaft-shaped first member 11 attached to the mating member 2 on the engine side, a cylindrical second member 15 attached to the vehicle body side, a vibration isolation base 18 made of an elastic body that connects the first member 11 and the second member 15, a stopper 20 and a heat shield cover 30 attached to the first member 11.

[0024] The first member 11 is a boss fitting formed of a metal such as steel or an aluminum alloy, and is formed along the axis C. For the sake of simplicity of explanation, the upper side on the paper surface of FIG. 3 in the direction of the axis C is defined as the upper side (upper direction U) of the vibration isolator 10, and the lower side on the paper surface of FIG. 3 is defined as the lower side (lower direction D) of the vibration isolator 10. However, these upper and lower sides do not necessarily coincide with the upper and lower sides of the vehicle to which the vibration isolator 10 is attached.

[0025] The first member 11 includes a connecting portion 12 to which the vibration isolation base 18 is connected, a flange 13 that projects radially outward from the upper end of the connecting portion 12, and an insertion portion 14 that projects upward from the flange 13. The connecting portion 12 constitutes the lower end side of the first member 11, and the insertion portion 14 constitutes the upper end side of the first member 11.

[0026] As shown in FIGS. 1 and 2, the outer peripheral surface of the insertion portion 14 is formed in a cylindrical surface shape centered on the axis C. On this insertion portion 14, an outer peripheral convex portion (first convex portion and second convex portion) 14b that projects from a part of the outer peripheral surface and a regulating outer surface 14c that cuts a part of the outer peripheral surface radially inward are respectively formed.

[0027] The outer peripheral convex portion 14b is a rectangular parallelepiped-shaped portion formed to extend in the vertical direction U-D, and protrudes from one location on the outer peripheral surface of the insertion portion 14. Among the radial directions perpendicular to the axis C, the direction in which the outer peripheral convex portion 14b protrudes (the right side of the drawing sheet in FIG. 2) is the right direction R (the right side of the vibration isolator 10), the side opposite to the right direction R (the left side of the drawing sheet in FIG. 2) is the left direction L (the left side), the upper side of the drawing sheet in FIG. 2 is the front direction F (the front side), and the lower side of the drawing sheet in FIG. 2 is the rear direction B (the rear side). These left, right, front, and rear do not necessarily coincide with the left, right, front, and rear of the vehicle to which the vibration isolator 10 is attached.

[0028] The restricting outer surface 14c is provided on both the front and rear sides of the outer peripheral surface of the insertion portion 14, respectively, and extends over substantially the entire length of the insertion portion 14 in the vertical direction U-D. The restricting outer surface 14c is a flat surface formed perpendicular to the front-rear direction F-B, and both edges in the left-right direction L-R are continuous with the outer peripheral surface of the cylindrical insertion portion 14, respectively.

[0029] The mounting end 14d, which is the upper end of the insertion portion 14, is continuous with the outer peripheral surface of the insertion portion 14 via a ridge line and is formed by a flat surface perpendicular to the axis C. A bolt hole 14e is formed in the mounting end 14d.

[0030] As shown in FIG. 3, the mounting end 14d is attached to the mating member 2 via a bolt 4 attached to the bolt hole 14e. The mating member 2 extends from the mounting end 14d in the left direction L. A recess 2a is formed on the lower surface of the mating member 2 so as not to contact the stopper 20 in a state where no vibration is input to the vibration isolator 10 (when no vibration is input). When vibration is input to the vibration isolator 10, the bottom surface of this recess 2a mainly contacts the stopper 20.

[0031] The second member 15 is a cylindrical member mainly formed of a metal such as steel. In the present embodiment, the axis of the second member 15 coincides with the axis C of the first member 11. The second member 15 includes a cylindrical main body portion 16 to which the vibration isolation base 18 is connected, and a fixing portion 17 that supports and fixes the main body portion 16 to the vehicle body side.

[0032] Both the main body portion 16 and the fixing portion 17 are formed in a cylindrical shape centered on the axis C. The main body portion 16 has gradually decreasing inner and outer diameters from the central portion in the vertical direction U-D toward the lower end. Thereby, the main body portion 16 can easily support the vibration isolation base 18 from below.

[0033] The fixing portion 17 includes a large-diameter portion 17a on the lower end side, a reduced-diameter portion 17b that continues from the upper end of the large-diameter portion 17a and gradually decreases in inner and outer diameters upward, a small-diameter portion 17c that continues from the upper end of the reduced-diameter portion 17b and has smaller inner and outer diameters than the large-diameter portion 17a, and an end face portion 17d that closes the upper end of the small-diameter portion 17c.

[0034] The large-diameter portion 17a is fixed to the vehicle body side via a fitting or the like attached to the outer peripheral surface by welding or the like. Further, by press-fitting the main body portion 16 into the large-diameter portion 17a, the main body portion 16 is fixed to the fixing portion 17, and the second member 15 is fixed to the vehicle body side. The small-diameter portion 17c surrounds the flange 13 of the first member 11.

[0035] The end face portion 17d is a disc-shaped portion perpendicular to the axis C. A through-hole 17e is formed at the center in the radial direction of the end face portion 17d so as to penetrate an insertion portion 14 that protrudes upward from the flange 13. Since the inner diameter of this through-hole 17e is sufficiently larger than the outer diameter of the insertion portion 14, radial movement of the first member 11 with respect to the second member 15 can be allowed.

[0036] The vibration isolation base 18 is a member made of an elastic body such as rubber or thermoplastic elastomer formed in a substantially umbrella shape. The vibration isolation base 18 is vulcanized and adhered to the connecting portion 12 of the first member 11 and the inner peripheral surface of the main body portion 16 of the second member 15 over the entire circumference, connecting them.

[0037] When vibration in the vertical direction U-D is input to the vibration isolation device 10 and the vibration isolation base 18 elastically deforms, the first member 11 and the mating member 2 move (vibrate) in the vertical direction U-D with respect to the second member 15. The stopper 20 is for restricting the movement of the mating member 2 so that the mating member 2 does not collide with the end face portion 17d of the second member 15 due to this movement.

[0038] The stopper 20 is a member made of an elastic body (such as rubber or thermoplastic elastomer) disposed above the second member 15. The stopper 20 includes a plate portion 21 that covers the upper side of the end face portion 17d of the second member 15, a cylindrical portion 22 that hangs down from the outer peripheral edge of the plate portion 21 to cover the outer peripheral side of the small diameter portion 17c, and a thick portion 23 that protrudes upward (to the mating member 2) from the plate portion 21.

[0039] The plate portion 21 is a disc perpendicular to the axis C. A first insertion hole 21a into which the insertion portion 14 is inserted is formed through the center in the radial direction of the plate portion 21. By inserting the insertion portion 14 into the first insertion hole 21a, the gap between the insertion portion 14 and the edge of the through hole 17e of the end face portion 17d is blocked by the plate portion 21, so that dust and dirt can be prevented from entering the inside of the vibration isolator 10 through the gap.

[0040] A reinforcing portion 21d that projects downward along the entire circumference of the edge of the first insertion hole 21a is formed on the plate portion 21. The formation of cracks starting from the first insertion hole 21a in the plate portion 21 can be suppressed by this reinforcing portion 21d. Further, since the reinforcing portion 21d projects downward from the plate portion 21, interference between the reinforcing portion 21d and the heat shield cover 30 can be suppressed when the heat shield cover 30 is stacked on the plate portion 21.

[0041] The cylindrical portion 22 is a cylindrical part centered on the axis C. The cylindrical portion 22 makes it difficult for dust and dirt to enter between the plate portion 21 and the end face portion 17d of the second member 15, and further suppresses the entry of dust and dirt into the inside of the vibration isolator 10.

[0042] FIG. 4 is a plan view of the stopper 20. The first insertion hole 21a has an edge formed in a circular shape centered on the axis C. A first concave portion 21b that recesses a part of the circumferential direction in a stepped shape and a first bulging portion 21c that bulges a part of the circumferential direction radially inward are respectively formed in the first insertion hole 21a. The first insertion hole 21a including these first concave portion 21b and first bulging portion 21c is formed in the same shape as the insertion portion 14 shown in FIG. 2.

[0043] The first concave portion 21b is formed on the right side of the edge of the first insertion hole 21a, extends in the vertical direction U-D, and opens on both the upper and lower surfaces of the plate portion 21. The first concave portion 21b engages with the outer peripheral convex portion 14b of the insertion portion 14.

[0044] The first bulging portion 21c is formed on both the front and rear sides of the edge of the first insertion hole 21a. The first bulging portion 21c is formed in a straight line perpendicular to the front-rear direction F-B in plan view, and both the left and right ends are continuous with the edge of the first insertion hole 21a having a circular shape. This first bulging portion 21c engages with the restricting outer surface 14c of the insertion portion 14.

[0045] By the engagement of these first concave portion 21b and first bulging portion 21c with the outer peripheral convex portion 14b and the restricting outer surface 14c, the rotation of the stopper 20 with respect to the insertion portion 14 can be restricted. Thereby, it is possible to suppress the displacement in the circumferential direction of the position between the mating member 2 attached to the insertion portion 14 and the thick portion 23 of the stopper 20.

[0046] Note that the engagement of the first concave portion 21b, which projects stepwise radially outward like a part of a circle being cut inward in the radial direction, with the outer peripheral convex portion 14b can restrict the rotation of the stopper 20 with respect to the insertion portion 14 with a stronger force than the engagement of the first bulging portion 21c, which projects stepwise radially outward like a part of a circle being cut inward in the radial direction, with the restricting outer surface 14c.

[0047] In a state where the insertion portion 14 is not inserted into the first insertion hole 21a, the inner diameter R2 of the first insertion hole 21a of the portion excluding the first concave portion 21b and the first bulging portion 21c is slightly larger than the outer diameter R1 (see FIG. 2) of the insertion portion 14 of the portion excluding the outer peripheral convex portion 14b and the restricting outer surface 14c. Thereby, when the insertion portion 14 is inserted into the first insertion hole 21a, the inner peripheral surface of the first insertion hole 21a fits in a clearance fit (a state without an interference fit and with a gap) with the outer peripheral surface of the insertion portion 14. As a result, it becomes easy to insert the insertion portion 14 into the first insertion hole 21a, that is, it becomes easy to attach the stopper 20 to the first member 11.

[0048] The thick portion 23 is a portion that mainly comes into contact with the mating member 2 and elastically deforms when vertical U-D vibrations are input to the vibration isolation device 10. The thick portion 23 includes a first thick portion 23a disposed on the left side with respect to the first insertion hole 21a, and second thick portions 23b disposed continuously on both circumferential sides of the first thick portion 23a. As shown in FIG. 1, the height of the second thick portion 23b is lower than the height of the first thick portion 23a.

[0049] As shown in FIG. 3, the tip (upper end) of the first thick portion 23a is at substantially the same position as the mounting end 14d of the insertion portion 14 (a position slightly higher than the mounting end 14d). The tip of the first thick portion 23a is disposed in the recess 2a on the lower surface of the mating member 2 when vibrations are not input. Thereby, it becomes easy to position the first thick portion 23a and the mating member 2 in the circumferential direction.

[0050] When the vertical U-D movement of the mating member 2 is restricted by the stopper 20, the amount of deformation of the thick portion 23 (the first thick portion 23a) becomes large, but in the region of the stopper 20 on the opposite side (right side) of the thick portion 23 across the axial center C, it is hardly affected by the deformation of the thick portion 23. Since the first recess 21b and the outer peripheral convex portion 14b are fitted in this region, it is possible to suppress the fitting of the first recess 21b and the outer peripheral convex portion 14b from coming off as the thick portion 23 deforms.

[0051] The heat insulation cover 30 is a member for blocking heat from above (toward the mating member 2 side) to the vibration isolation base 18, and is disposed so as to overlap the upper side of the stopper 20. Although the stopper 20 alone can block heat from above to the vibration isolation base 18, the heat from above to the vibration isolation base 18 can be more easily blocked by the overlapping portion of the heat insulation cover 30 and the stopper 20.

[0052] Furthermore, since the stopper 20 and the heat insulation cover 30 are separate members, the stopper 20 can be configured from a material suitable for restricting the movement of the mating member 2 (a relatively soft elastic body), while the heat insulation cover 30 can be configured from a material having high heat insulation performance. Since the heat insulation cover 30 is formed of an elastic body having higher heat insulation performance than the material of the stopper 20, it is possible to more easily block heat from above to the vibration isolation base 18 by the heat insulation cover 30.

[0053] In this embodiment, the vibration isolation base 18 is covered with the second member 15. However, since the second member 15 is mainly made of metal and the vibration isolation base 18 is connected to the second member 15, when the second member 15 is heated, heat is transferred from the second member 15 to the vibration isolation base 18. Since the stopper 20 covers the upper end portion (end face portion 17d) of the second member 15 over the entire circumference and the heat insulation cover 30 is overlapped with a part of the stopper 20, it is easy to block the heat from above to the second member 15, and it is difficult to transfer the heat from the second member 15 to the vibration isolation base 18.

[0054] The heat insulation cover 30 includes a heat insulation plate portion 31 that covers a portion of the plate portion 21 of the stopper 20 where there is no thick portion 23, a heat insulation cylinder portion 32 that hangs down from the outer peripheral edge of the heat insulation plate portion 31 to cover a part of the outer peripheral side of the cylinder portion 22, walls 33, 34 that rise from the outer end face 31a which is the upper surface of the heat insulation plate portion 31, and a plurality of ribs 35 that rise from the walls 33, 34 and the outer end face 31a.

[0055] The heat insulation plate portion 31 is a plate perpendicular to the axis C and has an outer end face 31a facing the mounting end 14d side. By inserting the insertion portion 14 into the second insertion hole 31b formed through the heat insulation plate portion 31, the stopper 20 is attached to the first member 11. Due to this attachment, the plate portion 21 of the stopper 20 is sandwiched between the heat insulation plate portion 31 and the second member 15, so that the stopper 20 is positioned vertically.

[0056] Note that not only when the heat insulation plate portion 31 and the plate portion 21 are in close contact and overlap, but also a gap may be provided between the heat insulation plate portion 31 and the plate portion 21 and the two may be overlapped. In this case, the volume of the air layer between the heat insulation plate portion 31 and the plate portion 21 can be increased, and the heat insulation effect against the heat from above can be improved by the air layer. Since the dimensions of each member are set so that a gap can be formed between the heat insulation cylinder portion 32 and the cylinder portion 22 and between the cylinder portion 22 and the second member 15, the heat insulation effect against the heat from the radial direction can be improved by the air layer between them.

[0057] Further, a reinforcing portion 31e is formed on the heat shield plate portion 31 so as not to interfere with the stopper 20 overlapping the lower side, by protruding the entire circumference of the edge of the second insertion hole 31b upward. The formation of the reinforcing portion 31e can suppress the occurrence of cracks in the heat shield plate portion 31 starting from the second insertion hole 31b.

[0058] As shown in FIG. 2, the heat shield plate portion 31 is formed to extend from the second insertion hole 31b (reinforcing portion 31e) in the right direction R and the front direction F, and is formed in a semi-circular shape while avoiding the thick portion 23. A heat shield cylinder portion 32 is continuous with the outer peripheral edge of this semi-circle. That is, the heat shield cylinder portion 32 is formed in a semi-cylindrical shape centered on the axis C.

[0059] The second insertion hole 31b has an edge formed in a circular shape centered on the axis C. In the second insertion hole 31b, a second concave portion 31c that recesses a part of the circumferential direction and a second bulging portion 31d that bulges a part of the circumferential direction inward in the radial direction are respectively formed. The second insertion hole 31b including these second concave portion 31c and second bulging portion 31d is formed in the same shape as the insertion portion 14 and the first insertion hole 21a (see FIG. 4).

[0060] The second concave portion 31c is formed on the right side of the edge of the second insertion hole 31b, extends vertically, and opens on both the upper and lower surfaces of the heat shield plate portion 31 (reinforcing portion 31e). The second concave portion 31c fits with the outer peripheral convex portion 14b of the insertion portion 14.

[0061] The second bulging portion 31d is formed on both the front and rear sides of the edge of the second insertion hole 31b. The second bulging portion 31d is formed in a linear shape perpendicular to the front-rear direction F-B in a plan view, and both the left and right ends are continuous with the edge of the circular second insertion hole 31b. This second bulging portion 31d fits with the restricting outer surface 14c of the insertion portion 14.

[0062] By the fitting of these second concave portion 31c and second bulging portion 31d with the outer peripheral convex portion 14b and the restricting outer surface 14c, the rotation of the heat shield cover 30 with respect to the insertion portion 14 can be restricted. Therefore, it is possible to suppress the displacement of the position where the heat shield cover 30 shields the heat toward the vibration-proof base 18.

[0063] In addition, the heat shield plate portion 31 of the heat shield cover 30 is disposed adjacent to the circumferential direction of the second thick portion 23b of the stopper 20, and the height of the second thick portion 23b is substantially the same as the plate thickness of the heat shield plate portion 31. Therefore, if the heat shield cover 30 or the stopper 20 rotates with respect to the insertion portion 14, the heat shield cover 30 may cover the second thick portion 23b.

[0064] However, in the present embodiment, since the rotation of the heat shield cover 30 with respect to the insertion portion 14 is restricted by the second recess 31c or the like, it is difficult for the heat shield cover 30 to cover the second thick portion 23b. Similarly, since the rotation of the stopper 20 with respect to the insertion portion 14 is restricted by the first recess 21b or the like, it is difficult for the heat shield cover 30 to cover the second thick portion 23b.

[0065] FIG. 5 is a plan view of the heat shield cover 30. In a state where the insertion portion 14 is not inserted into the second insertion hole 31b, the inner diameter R3 of the second insertion hole 31b of the portion excluding the second recess 31c and the second bulging portion 31d is slightly smaller than the outer diameter R1 of the insertion portion 14 shown in FIG. 2. Thereby, when the insertion portion 14 is inserted into the second insertion hole 31b, the inner peripheral surface of the second insertion hole 31b elastically fits to the outer peripheral surface of the insertion portion 14.

[0066] Note that elastic fitting means bringing both (the outer peripheral surface of the insertion portion 14 and the inner peripheral surface of the second insertion hole 31b) into close contact with a predetermined interference fit. In the present embodiment, the two are elastically fitted by press-fitting the insertion portion 14 into the second insertion hole 31b, but the two may be elastically fitted by shrink fitting or cold fitting.

[0067] As shown in FIG. 1, by attaching the heat shield cover 30 to the insertion portion 14 by elastic fitting, it is possible to make it difficult for the heat shield cover 30 to fall off from the first member 11. Further, since the stopper 20 overlaps the lower side (the second member 15 side) of the heat shield cover 30, the stopper 20 does not fall off unless the heat shield cover 30 falls off from the first member 11, and it is possible to make it difficult for the stopper 20 to fall off from the first member 11. As a result, in a state where the mounting end 14d of the first member 11 is not attached to the mating member 2 (for example, during transportation of the vibration isolator 10), it is possible to make it difficult for the stopper 20 and the heat shield cover 30 to fall off from the first member 11, and it is possible to facilitate the parts management of the vibration isolator 10.

[0068] The walls 33, 34 are flat plate-like portions that rise vertically from the outer end surface 31a of the heat shield plate portion 31 and are arranged in a part of the circumferential direction with respect to the insertion portion 14 (the first member 11). Since the heat from the radially outer side toward the first member 11 can be blocked by these walls 33, 34, it is possible to suppress the heat from being transmitted to the vibration isolation base 18 through the first member 11. As a result, the heat shielding performance against the heat coming from the upper side and the radially outer side toward the vibration isolation base 18 can be further improved.

[0069] The wall 33 is located on the right side of the insertion portion 14 (the second insertion hole 31b) and is formed perpendicular to the left-right direction L-R. The wall 34 is located on the front side of the insertion portion 14 and is formed perpendicular to the front-back direction F-B. Thereby, it is possible to easily block the heat coming from the upper right obliquely toward the vibration isolator 10 by the wall 33, and it is possible to easily block the heat coming from the upper front obliquely toward the vibration isolator 10 by the wall 34.

[0070] Note that since the thick portion 23 is located on the side opposite to the walls 33, 34 with the insertion portion 14 interposed therebetween, the thick portion 23 and the walls 33, 34 can surround most (substantially all) of the periphery of the insertion portion 14. Thereby, since the heat toward the first member 11 can be blocked more effectively, the heat shielding performance against the heat coming from the upper side and the radially outer side toward the vibration isolation base 18 can be further improved.

[0071] In particular, since the height of the first thick portion 23a of the thick portion 23 is approximately the same as the height of the walls 33 and 34, and the first thick portion 23a covers the entire left side of the insertion portion 14, heat traveling from the left side toward the first member 11 can be blocked more effectively. Therefore, the heat insulation performance against heat traveling from the upper left obliquely toward the vibration isolation base 18 can be further improved.

[0072] The walls 33 and 34 are provided up to a position slightly lower than the attachment end 14d of the insertion portion 14. This makes it difficult for the mating member 2 attached to the attachment end 14d and the walls 33 and 34 to interfere with each other. However, depending on the shape of the mating member 2, the walls 33 and 34 may be made higher than the attachment end 14d. In this case, heat coming from the upper left obliquely toward the vibration isolation device 10 can be more easily blocked by the walls 33 and 34.

[0073] Since the front edge of the wall 33 and the right edge of the wall 34 are connected and the walls 33 and 34 are arranged perpendicular to each other, it is possible to make the walls 33 and 34 difficult to fall over. As a result, it is easier to exhibit the effect of improving the heat insulation performance of the vibration isolation base 18 by the walls 33 and 34.

[0074] Furthermore, since the rear edge of the wall 33 and the left edge of the wall 34 are located at the outer peripheral edge of the heat insulation plate portion 31, it is possible to suppress heat from the right side or the front side from bypassing the walls 33 and 34 and being transmitted to the first member 11. As a result, the heat insulation performance by the walls 33 and 34 can be improved.

[0075] Also, since the walls 33 and 34 rise from the outer end surface 31a of the heat insulation plate portion 31, the rigidity of the heat insulation cover 30 between the walls 33 and 34 and the second insertion hole 31b is increased. Since the second concave portion 31c and the outer peripheral convex portion 14b are fitted in the region where the rigidity is increased, deformation in the vicinity of the second concave portion 31c provided in the heat insulation cover 30 can be suppressed, and the fitting between the second concave portion 31c and the outer peripheral convex portion 14b can be made difficult to come off.

[0076] The rib 35 is a part for making the walls 33 and 34 more difficult to fall over. A plurality of ribs 35 stand vertically from the outer end face 31a and the walls 33 and 34. Since the walls 33 and 34 are reinforced by the plurality of ribs 35 and are difficult to fall over, the effect of improving the heat insulation performance of the vibration-proof base 18 by the walls 33 and 34 can be more easily exerted.

[0077] Here, when the rib 35 rises from the inner surfaces of the walls 33 and 34 on the insertion part 14 side, it is necessary to move the walls 33 and 34 away from the insertion part 14. On the other hand, in this embodiment, since the rib 35 rises from the outer surfaces of the walls 33 and 34 on the side opposite to the insertion part 14, the walls 33 and 34 can be arranged closer to the insertion part 14 compared with the case where the rib 35 is provided on the inner surfaces of the walls 33 and 34 on the insertion part 14 side. As a result, it is easier to block the heat heading from the right obliquely upward or the front obliquely upward toward the first member 11 with the walls 33 and 34.

[0078] Also, since it is easier to secure a wider space for providing the rib 35 on the outer surface side than on the inner surface side of the walls 33 and 34, the degree of freedom in the shape and number of the ribs 35 can be improved. Furthermore, since the rib 35 is located on the outer surface side of the walls 33 and 34, it is possible to make it difficult for the mating member 2 attached to the insertion part 14 and the rib 35 to interfere with each other, and it is easier to design the arrangement of the rib 35.

[0079] As described above, the present invention has been described based on the embodiment. However, the present invention is not limited to the above embodiment at all, and it can be easily inferred that various improvements and modifications are possible without departing from the gist of the present invention. For example, the axis C of the first member 11 and the axis of the second member 15 may be arranged offset.

[0080] The positions, dimensions, shapes, etc. of the walls 33 and 34, the ribs 35, and the thick portions 23 (the first thick portion 23a and the second thick portion 23b) may be appropriately changed according to the direction of the heat heading toward the vibration-proof device 10 and the position of the mating member 2. For example, the heat insulation cover 30 may also be extended to the outside in the radial direction of the thick portion 23, and the walls 33 and 34 may surround the entire circumference of the insertion part 14.

[0081] In the above-described embodiment, the case where the inner peripheral surface of the first insertion hole 21a of the stopper 20 fits tightly with the outer peripheral surface of the insertion portion 14 has been described, but it is not limited thereto. The inner peripheral surface of the first insertion hole 21a of the stopper 20 may be elastically fitted (tightly fitted) to the outer peripheral surface of the insertion portion 14, or may be fitted by an intermediate fit.

[0082] In the above-described embodiment, an engine mount has been exemplified as an application target of the vibration isolation device 10, but the application target is arbitrary. Other application targets include, for example, motor mounts, member mounts, and differential mounts. Further, it is not limited to the case where the first member 11 is attached to the vibration source side such as an engine and the second member 15 is attached to the vibration receiving side such as a vehicle body. The first member 11 may be attached to the vibration receiving side and the second member 15 may be attached to the vibration source side.

[0083] Further, the lower end of the second member 15 may be closed with a diaphragm, and a liquid may be enclosed in a liquid chamber formed between the vibration isolation base 18 and the diaphragm to make the vibration isolation device 10 a liquid-encapsulated vibration isolation device. In this case, a partition body for partitioning the liquid chamber into a plurality may be provided, or an orifice for communicating the plurality of liquid chambers may be provided in the partition body.

[0084] In the above-described embodiment, the case where the heat shield cover 30 is formed of an elastic body has been described, but it is not limited thereto. For example, the heat shield cover 30 may be formed of a material such as metal or ceramics having high heat insulation performance.

[0085] A part of the above-described embodiment may be omitted. For example, at least a part of the cylindrical portion 22 of the stopper 20 or the heat shield cylindrical portion 32 of the heat shield cover 30 may be omitted. Further, at least one of the walls 33, 34 or the rib 35 may be omitted. Further, the second thick portion 23b may be omitted. The outer peripheral convex portion 14b and the regulating outer surface 14c may be omitted, and the corresponding first concave portion 21b, first bulging portion 21c, second concave portion 31c, and second bulging portion 31d may be omitted.

[0086] Instead of the outer peripheral convex portion 14b that protrudes a part of the outer peripheral surface of the insertion portion 14, an outer peripheral concave portion that recesses (in a stepped shape) a part of the outer peripheral surface of the insertion portion 14 may be provided. The outer peripheral concave portion is formed to extend in the vertical direction U-D in the same manner as the outer peripheral convex portion 14b and opens at the mounting end 14d. In this case, it is preferable to project the first convex portion that fits into the outer peripheral concave portion from a part of the circumferential direction of the first insertion hole 21a (in a stepped shape), and project the second convex portion that fits into the outer peripheral concave portion from a part of the circumferential direction of the second insertion hole 31b (in a stepped shape).

[0087] Also, the positions, shapes, dimensions, etc. of the outer peripheral convex portion 14b, the outer peripheral concave portion, the first concave portion 21b, the first convex portion, the second concave portion 31c, and the second convex portion may be appropriately changed. Both the outer peripheral convex portion 14b and the outer peripheral concave portion may be provided on the insertion portion 14, and unevenness that fits with at least one of them may be provided in the first insertion hole 21a and the second insertion hole 31b.

[0088] Furthermore, the outer peripheral surface of the insertion portion 14 is not limited to a cylindrical surface shape. For example, the outer peripheral surface of the insertion portion may be a prismatic surface shape, and the first insertion hole and the second insertion hole into which the insertion portion is inserted may be polygonal in plan view. Also in this case, it is preferable to set the dimensions of each part so that the inner peripheral surface of the first insertion hole fits tightly with the outer peripheral surface of the insertion portion, and the inner peripheral surface of the second insertion hole elastically fits with the outer peripheral surface of the insertion portion.

Explanation of Reference Numerals

[0089] 2 Counter member 10 Vibration isolator 11 First member 14 Insertion portion 14b Outer peripheral convex portion (first convex portion, second convex portion) 14d Mounting end 15 Second member 18 Vibration isolation base 20 Stopper 21a First insertion hole 21b First concave portion 23 Thick portion 23a First thick portion 23b Second thick portion 30 Heat shield cover 31a Outer end face 31b Second insertion hole 31c Second recess 33, 34 Walls 35 Rib

Claims

1. A shaft-shaped first member having a mounting end, which is one end in the axial direction, attached to a mating member, A cylindrical second member surrounding the first member, A vibration-isolating base made of an elastic body connecting the first member and the inner peripheral surface of the second member, An elastic stopper having a first insertion hole into which the first member is inserted, disposed on the mounting end side of the second member, and restricting the movement of the mating member, A heat shield cover having a second insertion hole into which the first member is inserted and overlapping a part of the mounting end side of the stopper, and comprising: A vibration-isolating device, characterized in that the inner peripheral surface of the second insertion hole elastically fits onto the outer peripheral surface of the first member.

2. The vibration-isolating device according to claim 1, characterized in that the inner peripheral surface of the first insertion hole fits onto the outer peripheral surface of the first member with an interference fit.

3. The first member includes an insertion portion formed with a cylindrical outer peripheral surface that is continuous to the mounting end via a ridge line and is inserted into the first insertion hole and the second insertion hole, A first recess that recesses a part of the circumferential direction is formed to extend in the axial direction in either one of the insertion portion and the first insertion hole, The vibration-isolating device according to claim 1 or 2, characterized in that a first protrusion that fits into the first recess is formed in the other of the insertion portion and the first insertion hole.

4. The stopper includes a thick portion protruding toward the mating member, The vibration-isolating device according to claim 3, characterized in that the first recess and the first protrusion fit on the opposite side of the thick portion across the axis of the insertion portion.

5. The heat shield cover includes an outer end surface facing the mounting end side in the axial direction, The vibration-isolating device according to any one of claims 1 to 4, characterized in that the heat shield cover includes a wall rising from the outer end surface and disposed at least partially in the circumferential direction with respect to the first member.

6. The heat shield cover is provided with ribs that rise from the outer end face and the wall to reinforce the wall, and the vibration isolation device according to claim 5 is characterized by this.

7. The rib rises from the outer surface of the wall on the side opposite to the first member, and the vibration isolation device according to claim 6 is characterized by this.

8. The stopper is provided with a thick portion that protrudes toward the mating member, The thick portion is located on the side opposite to the wall with the first member interposed therebetween, and the vibration isolation device according to any one of claims 5 to 7 is characterized by this.

9. The first member is provided with an insertion portion having an outer peripheral surface that is formed in a cylindrical shape and is continuous via a ridge line at the mounting end and is inserted into the first insertion hole and the second insertion hole, In either one of the insertion portion and the second insertion hole, a second recess that is recessed in a part of the circumferential direction extends in the axial direction, In the other of the insertion portion and the second insertion hole, a second protrusion that fits into the second recess is formed, and the vibration isolation device according to any one of claims 1 to 8 is characterized by this.

10. The stopper is provided with a thick portion that protrudes toward the mating member, The thick portion includes a first thick portion and a second thick portion having a lower height than the first thick portion, In a state where the second recess and the second protrusion are fitted, the heat shield cover is arranged adjacent to the second thick portion in the circumferential direction, and the vibration isolation device according to claim 9 is characterized by this.

11. The heat shield cover includes an outer end face facing the mounting end side in the axial direction, and a wall that rises from the outer end face and is arranged at least in a part of the circumferential direction with respect to the first member, The second recess and the second protrusion are fitted between the second insertion hole and the wall, and the vibration isolation device according to claim 9 or 10 is characterized by this.

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