WO2014002555A1 - Damper for opening / closing body - Google Patents

Description

Opening and closing body damper

The present invention relates to an improvement of a damper for an opening / closing body that cushions an impact when an opening formed in a vehicle body is closed by the opening / closing body.

The opening of a vehicle body in a general vehicle such as a passenger car is opened and closed by an opening / closing body such as a door or a tailgate. For example, a damper is disposed between the vehicle body and the tailgate in order to buffer the impact when the tailgate is closed and to attenuate the vibration of the tailgate when the vehicle is running. For example, Patent Document 1 is known as a configuration for attenuating vibration caused by a damper. Patent Document 2 is known as a damper covered with a rubber member or the like.

In the configuration for attenuating the vibration caused by the damper disclosed in Patent Document 1, a fluid damper is provided on the vehicle body panel. Vibration caused by the tailgate when the vehicle is running can be damped by a fluid damper. The fluid damper is provided with two springs inside the cylinder chamber, and these two springs support the piston in the cylinder chamber from above and below, respectively, and the piston is arranged in the middle of the cylinder chamber in the protruding and retracting direction of the piston rod. ing.

In the technique of covering a damper known by Patent Document 2 with a rubber member or the like, an elastic body covered with rubber is provided on a trunk lid that covers a trunk of a vehicle in an openable and closable manner. The elastic body acts as a damper and cushions the impact when the trunk is closed. Specifically, the elastic body has an elastic contact portion attached to the tip of a coil spring provided on the trunk lid, and the coil spring is covered with a cap body made of a rubber material or the like.

The fluid damper disclosed in Patent Document 1 is provided with a piston in a cylinder chamber, and can improve a function of buffering an impact and a function of damping a vibration. Since water and dust are likely to enter the portion where the fluid damper is disposed, it is necessary to prevent water from entering the fluid damper and biting of dust. In order to prevent water exposure and the like, the fluid damper is waterproofed by covering with a boot made of a rubber member as disclosed in Patent Document 2.

However, in order to improve waterproofness, the damper is sealed when the damper is completely covered with boots. When the damper expands and contracts, the boot also expands and contracts, whereby the air pressure inside the sealed interior increases and decreases, and the boot functions as an air spring. There is room for improvement in order to improve the original damper performance that cushions the impact when the opening and closing body such as the tailgate is closed.

Furthermore, as a structure for simplifying the structure of the fluid damper disclosed in Patent Document 1, a structure with one spring is conceivable. If only the lower surface of the piston is supported by a single spring, the upper surface of the piston contacts one side surface of the cylinder in a state where there is no input to the fluid damper. When there is an input from above, the fluid flows from the space below the piston to the space above the piston, so that the impact caused by the input can be absorbed.

However, when the piston is in contact with one side of the cylinder at the initial stage of input to the fluid damper, the space above the piston is not formed, so the initial flow of fluid that flows from the space below the piston to the space above the piston The flow path is narrow, making it difficult for fluid to flow. As a result, the load required at the initial stage of the piston stroke increases, and the damper performance at the initial stage of input is not sufficiently exhibited. In particular, when the damper is provided between the door and the vehicle body, if the door is closed when the door is opened, that is, when there is no input to the damper, the load at the initial input to the damper increases. For this reason, there is a very temporary resistance just before closing the door. There is room for improvement to improve the opening and closing of the door.

Japanese Utility Model Publication No. 61-182434 Japanese Utility Model Publication No.4-11942

An object of the present invention is to provide a damper for an opening / closing body capable of sufficiently waterproofing the damper main body while improving the damper performance of the damper main body. Furthermore, this invention makes it a subject to provide the damper for opening / closing bodies which can improve the simple opening / closing property of a door by simple structure.

According to the first aspect of the present invention, there is provided a damper for an opening / closing body, wherein the damper body is attached to one of a vehicle body and an opening / closing body that opens and closes an opening formed in the vehicle body and abuts against the other. A boot configured to cover at least a stretchable portion of the damper main body and be made of an elastic material that can be stretched and contracted in accordance with the expansion and contraction action of the damper main body, and the boot contacts the outer peripheral surface of the damper main body. A seal part that seals between the outer peripheral surface and a vent hole that is formed on the outer peripheral surface of the boot and vents into and out of the boot when the boot expands and contracts. An opening / closing body damper is provided.

In the invention according to claim 2, preferably, the damper main body includes a housing having an attachment portion that can be attached to one of the vehicle body and the opening / closing body, and is housed in the housing so as to be movable forward and backward. A rod that can be projected and retracted from the through-hole, and the rod is in contact with the other of the vehicle body and the opening / closing body, and the seal portion is connected to the housing from the through-hole. Is also located on the attachment portion side, and the vent hole is located on the through hole side with respect to the boot from the seal portion.

In the invention according to claim 3, preferably, the boot includes a bellows portion having a configuration in which a large-diameter crest and a small-diameter trough are alternately arranged so that the boot can be expanded and contracted in accordance with the advancing and retreating action of the rod. And the bellows part is located closer to the through hole than the seal part.

In the invention according to claim 4, preferably, the boot has a thick part thicker than a thickness of the bellows part, and the seal part is provided in the thick part.

In the invention according to claim 5, preferably, the vent hole is formed in the peak portion of the bellows portion.

In the invention according to claim 6, preferably, the vent hole is disposed in the boot so that the opening is positioned at a lower portion of the boot when the opening is closed by the opening / closing body.

In the invention according to claim 7, preferably, when the damper main body is attached to any one of the vehicle body and the opening / closing body, the boot is provided with any one of the vehicle body and the opening / closing body and the boot. A sandwiched portion that can be sandwiched between the damper main body, and the sandwiched portion is a rotation capable of restricting relative rotational displacement of the boot with respect to either the vehicle body or the opening / closing body. Has a regulatory department.

According to an eighth aspect of the invention, there is provided an opening / closing body damper having a damper main body attached to one of the vehicle body and an opening / closing body that opens and closes an opening formed in the vehicle body and abutting against the other. The damper main body includes a housing that can be attached to either the vehicle body or the opening / closing body, a cylinder formed inside the housing, and a housing that can be moved forward and backward. A rod that can be projected and retracted through a hole, a rod that can be brought into contact with either the vehicle body or the opening and closing body, a rod that is integrally provided with the rod, and is slidably fitted into the cylinder, A piston that partitions the inside of the cylinder into two fluid chambers in the axial direction; and a biasing member that biases the piston toward one end surface in the axial direction of the cylinder; A stopper for restricting the one end surface of the cylinder and the piston to be separated from each other when the rod is not in contact with the other of the vehicle body and the opening / closing body. The stopper is provided with a damper for an opening / closing body that is located on at least one of the piston, the rod, and the one end surface of the cylinder.

In the invention according to claim 9, preferably, the stopper is provided over both the piston and the rod.

In the invention according to claim 10, preferably, the diameter of the piston is larger than the diameter of the rod, and the stopper is provided at a corner between the end face of the piston and the rod.

In the invention according to claim 11, preferably, at least one reinforcing rib extending from the stopper to the outer peripheral surface of the piston is formed on the end surface of the piston.

In the invention according to claim 12, preferably, the plurality of reinforcing ribs are provided, and a groove penetrating in an axial direction of the piston is formed on the outer peripheral surface of the piston, and the groove includes the plurality of the ribs. Located between the reinforcing ribs.

In the invention according to claim 1, the boot includes a seal portion that seals between the outer peripheral surface of the damper main body and a vent hole that allows air to enter and exit the boot when the boot expands and contracts. The boot is in contact with the outer peripheral surface of the damper main body, and by utilizing this contact portion, the damper main body can be sufficiently waterproofed by sealing between the boot and the damper main body. Further, since the vent hole is provided on the outer peripheral surface of the boot, when the damper main body contracts, the air in the boot is released from the vent hole to the outside, and the boot is prevented from functioning as an air spring. Therefore, the damper performance of the damper main body can be sufficiently enhanced.

In the invention according to claim 2, the seal portion is located closer to the attachment portion than the through hole with respect to the housing. Since the seal part is located closer to the attachment part than the through hole, even if water enters from the attachment part, water is sealed by the seal part and prevents water from entering before the seal part. Can do. As a result, since water does not reach the through hole, water can be prevented from entering the housing from the through hole.

In the invention according to claim 3, the bellows part is located closer to the through hole than the seal part. When the damper main body expands and contracts, the rod appears and disappears from the through hole at the front end of the housing, so that the space between the front end of the rod and the front end of the housing expands and contracts. On the other hand, since the bellows portion of the boot expands and contracts preferentially, the portion that expands and contracts on the damper body side and the portion that expands and contracts on the boot side are both positioned closer to the through hole than the seal portion. As a result, even if the damper main body expands and contracts, the bellows part expands and contracts on the boot side and the seal part does not receive much external force in the expansion and contraction direction. Can be maintained.

In the invention according to claim 4, the seal portion is provided in the thick portion of the boot. Since the thick portion is thicker than the bellows portion, it is less likely to be deformed than the bellows portion by an external force. Since the seal portion is provided in the thick portion that is difficult to deform, the seal portion can enhance the sealing performance.

In the invention according to claim 5, the vent hole is formed in the peak portion of the bellows portion. Since the bellows portion is alternately arranged with peaks and valleys and has a undulating shape, it does not stand out even if vent holes are provided in the bellows portion. Therefore, the appearance of the damper for the opening / closing body can be ensured.

In the invention according to claim 6, the vent hole is arranged in the boot so as to be located in the lower part of the boot. Since the vent hole is arranged at the lower part of the boot and formed at the peak portion, the vent hole is arranged at the lowest position of the boot. As a result, since the vent hole functions as a drain port, water can be discharged without accumulating in the bellows part. Further, even if water enters the boot, the intruded water can be immediately discharged from the vent hole.

In the invention according to claim 7, the boot has a sandwiched portion that can be sandwiched between either the vehicle body or the opening / closing body and the damper main body, and the rotation restricting portion is provided in the sandwiched portion. ing. Since the boot is provided with the rotation restricting portion, the boot does not rotate with respect to the vehicle body or the opening / closing body, and the vent hole can always be positioned below the boot. Further, the held portion can be sandwiched between either the vehicle body or the opening / closing body and the damper main body, and is not visible from the outside. Since the rotation restricting portion is not visible, the appearance of the opening / closing body damper can be secured.

In the invention according to claim 8, the one end surface of the cylinder is an end surface that defines a sliding limit to one side of the piston, and when the piston slides to the sliding limit with respect to the one end surface, the end surface is located between the one end surface and the piston. Has a stopper (position restricting portion) for providing a gap. Since the stopper (position restricting portion) maintains the state where the one end surface of the cylinder and the piston are separated from each other, a fluid chamber is formed on the one end surface side of the piston even at the initial input to the opening / closing body damper. The initial flow path of the fluid flowing out from the fluid chamber on the end surface side to the fluid chamber on the one end surface side can be widened. As a result, even in the initial stage of input to the opening / closing body damper, the fluid flows easily, and the load required at the initial stage of the piston stroke does not increase. Therefore, the opening / closing performance of the door can be improved. In addition, since the stopper (position restricting portion) is only provided on at least one of the piston, the rod, and the one end surface of the cylinder, the opening / closing body damper may have a simple configuration.

In the invention according to claim 9, the stopper (position restricting portion) is provided over both the piston and the rod. Since the piston and the rod are connected by a stopper (position restricting portion), the rigidity between the piston and the rod is improved, and the fall between the rod and the piston can be prevented.

In the invention according to claim 10, the diameter of the piston is larger than that of the rod, and the stopper (position restricting portion) is provided at a corner between the end face of the piston and the rod. The stopper (position restricting portion) increases the rigidity of the corner between the piston end face and the rod.

In the invention according to claim 11, at least one reinforcing rib extending from the stopper (position restricting portion) to the outer peripheral surface of the piston is formed on the end surface of the piston. By providing the reinforcing lip, the entire radial direction of the piston is reinforced, so that the rigidity in the radial direction can be maintained even if the thickness of the piston itself is reduced. In addition, since the reinforcing rib extends to the outer peripheral surface of the piston, even if the piston is inclined, the reinforcing rib contacts the one end surface of the cylinder before the piston. Can be secured. As a result, the initial flow path can be secured more.

In the invention according to claim 12, a groove penetrating in the axial direction of the piston is formed on the outer peripheral surface of the piston, and the groove is positioned between the plurality of reinforcing ribs. Since the groove is provided on the outer peripheral surface of the piston, the amount of fluid flowing between the fluid chambers on both sides of the piston can be easily adjusted by changing the size of the groove. Accordingly, the attenuation amount of the opening / closing body damper can be easily adjusted. In addition, since the reinforcing ribs are provided on both sides of the groove, the rigidity of the piston can be reinforced even if the groove is provided. Further, since the reinforcing ribs are provided on both sides of the groove, there are a plurality of reinforcing ribs. Even if the piston is inclined in any of the circumferential directions, any of the reinforcing ribs is attached to one end surface of the cylinder. A fluid chamber can be secured on one end face side of the cylinder. As a result, the initial flow path can be secured more.

It is a perspective view of a vehicle showing an example of attachment of an opening / closing body damper according to the present invention. It is a side view around the damper for opening-and-closing bodies shown by FIG. It is sectional drawing of the damper for opening-and-closing bodies of the state which closed the tailgate shown by FIG. FIG. 4 is an enlarged cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a perspective view of a piston and a rod shown in FIG. 4. It is a perspective view of the damper for opening-and-closing bodies shown by FIG. It is the figure of the bracket seen from the arrow 7 direction of FIG. It is an operation | movement figure of the stopper of the damper for opening-and-closing bodies shown in FIG. It is an operation | movement figure of the boots of the damper for opening / closing bodies which concerns on this invention. It is sectional drawing which showed the modification of the damper for opening / closing bodies which concerns on this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1, the vehicle 10 includes an opening / closing body 13 for opening / closing an opening 12 formed in the vehicle body 11. For example, the opening 12 is formed on the rear surface of the vehicle body 11. The opening / closing body 13 is constituted by a tailgate that opens and closes the opening 12. Hereinafter, the opening 12 is appropriately referred to as a “rear opening 12”. The opening / closing body 13 is appropriately referred to as a “tail gate 13”. By opening the tailgate 13, the stored items can be taken in and out of the luggage compartment 14 at the rear of the vehicle.

The tailgate 13 is attached to the rear upper end of the vehicle body 11 so as to be able to swing vertically by a hinge (not shown). Near the upper part of the opening 12 of the vehicle body 11, one end of the left and right open stays 15, 15 that can be expanded and contracted and is urged in the extending direction is swingably supported. The other ends of the left and right open stays 15 are connected to left and right brackets 30 (only the left is shown) provided on the left and right side portions 16 of the tailgate 13. The open stays 15 and 15 can support the tailgate 13 in an opened state.

An opening sealing member 21 (tailgate weatherstrip 21) is provided on the inner peripheral edge of the opening 12 of the vehicle body 11, and is opened and closed by the tailgate 13. The opening / closing seal member 21 is an annular rubber product along the periphery of the opening 12. That is, the opening sealing member 21 seals the inside and outside of the vehicle body 11 by contacting the peripheral edge 22 (seal surface 22) of the inner surface of the tailgate 13 in a state where the opening 12 is closed by the tailgate 13. It is an elastic member.

The left and right brackets 30 are provided with left and right opening / closing body dampers 40 for buffering an impact when the opening 12 is closed by the tailgate 13. When the tailgate 13 is closed, the left and right opening / closing body dampers 40 abut against the side surface 23 near the opening 12 of the vehicle body 11.

Next, the periphery of the opening / closing body damper 40 on the left side in the vehicle width direction will be described. As shown in FIG. 2, the tailgate 13 is in a position immediately before closing the opening 12. The bracket 30 is attached to the side portion 16 of the tailgate 13 by bolts 31 and 31.

The bracket 30 includes side attachment portions 32 and 32 that contact the side portion 16 of the tailgate 13, an open stay attachment portion 33 to which the open stay 15 is attached one step higher than the side attachment portions 32 and 32, and the bracket 30 itself. The mounting seat surface 34 is formed at a substantially center in the vertical direction and to which the opening / closing body damper 40 is mounted.

The side surface 23 of the vehicle body 11 has a damper receiving surface 24 that faces the rear of the vehicle and receives the opening / closing body damper 40. When the opening / closing body damper 40 contacts the damper receiving surface 24, the axial direction of the opening / closing body damper 40 is substantially parallel to the normal direction of the receiving surface 24. The direction of the impact force when closing the tailgate 13 and the axial direction of the opening / closing body damper 40 substantially coincide.

Next, a state where the opening 12 is closed by the tailgate 13 will be described. As shown in FIG. 3, the left opening / closing body damper 40 is in contact with the damper receiving surface 24 of the vehicle body 11. The tailgate 13 is configured by combining a tailgate outer panel 25 that forms the outside and a tailgate inner panel 26 that forms the inside. The rear portion of the vehicle body 11 is configured by combining a rear panel outer 27 that forms the outer side and a rear panel inner 28 that forms the inner side with a flange portion 29, and an opening sealing member 21 is provided on the flange portion 29.

The seal member 21 for opening is brought into contact with the peripheral edge 22 (seal surface 22) of the tailgate inner panel 26, whereby the space between the vehicle body 11 and the tailgate 13 is sealed. The surfaces of the tailgate outer panel 25 and the rear panel outer 27 that form the outer appearance are substantially flush with each other. A space surrounded by the side surface 23 (the side surface 23 in the vicinity of the opening 12) that does not form the appearance of the rear panel outer 27 and the side portion 16 of the tailgate inner panel 26 is a passage 17. The open stay 15, the bracket 30 and the opening / closing body damper 40 are accommodated in the passage 17.

The passage 17 serves as a rain gutter through which rain water and the like flow from the roof of the vehicle body 11 and the upper part of the tailgate 13 when it rains. Returning to FIG. 1, during rainy weather, rainwater flows through the passage 17 as shown by the arrow a. In this way, in the passage 17, water may flow from top to bottom, so that the opening / closing body damper 40 is preferably waterproofed.

Next, the left opening / closing body damper 40 will be described. Since the right opening / closing body damper 40 has the same configuration as the left opening / closing body damper 40, the description thereof is omitted. As shown in FIG. 4, the left open / close body damper 40 includes a damper main body 41 attached to the bracket 30 and a boot 81 that covers at least a stretchable portion of the damper main body 41. The boot 81 is made of an elastic material that can expand and contract according to the expansion and contraction action of the damper main body 41.

The damper main body 41 can be projected and retracted from a housing 42, a piston 44 slidably provided inside a cylinder 43 formed in the housing 42, and a through hole 45 provided integrally with the piston 44 at the tip of the housing 42. Rod 46, a rod spring receiving member 48 provided at the distal end of the rod 46 for receiving the biasing member 47, a housing spring receiving portion 49 provided on the base end side of the housing 42 for receiving the biasing member 47, and the housing spring receiving member An urging member 47 mounted between the portion 49 and the rod spring receiving member 48 and an abutting member 51 provided on the rod spring receiving member 48 are configured. With this urging member 47, the piston 44 can be urged to the one end surface 50 of the cylinder 43 in the axial direction.

The end plate 52 is bonded to the base end side of the housing 42, and a mounting portion 53 is fixed to the end plate 52 with bolts 54. An O-ring 55 for sealing between the housing 42 and the end plate 52 is provided at the end of the housing 42. An O-ring 56 for sealing between the rod 45 and the through hole 45 is provided on the outer periphery of the rod 46.

The cylinder 43 can be sealed by sealing with the O-rings 55 and 56. In the embodiment, the housing 42 and the end plate 52 are bonded. However, the present invention is not limited to this, and other bonding methods may be used as long as the end plate 52 is bonded to the housing 42 such as welding or caulking. Absent.

A rod spring receiving member 48 is provided by a C clip 57 at the tip of the rod 46. The contact member 51 is attached to the rod spring receiving member 48 by inserting the claw portion 59 of the contact member 51 into the mounting hole 58 of the rod spring receiving portion 48. The contact member 51 is supported by the rod spring receiving member 48 and the tip of the rod 46.

The mounting part 53 is provided with a plurality of claw parts 61. The opening / closing body damper 40 can be attached to the bracket 30 by inserting the attachment portion 53 into the damper attachment hole 35 of the bracket 30 and hooking the claw portion 61.

Also, the inside of the cylinder 43 is partitioned into two fluid chambers 62 and 63 by the piston 44. In the natural state where the tailgate 13 (FIG. 1) is opened, the piston 44 is urged against the one end face 50 of the cylinder 43. One end surface 50 of the cylinder 43 is an end surface that defines a sliding limit of the piston to one side with respect to the cylinder 43, and the piston 44 is in a position in contact with the one end surface 50.

The piston 44 has a stopper 71 (position restricting portion 71) for making a gap between the one end surface 50 and the piston 44 by contacting the one end surface 50 when the piston 44 moves to the slide limit. Even if the piston 44 is urged to the slide limit by the stopper 71 (position restricting portion 71), the fluid chamber 62 can be provided.

In the embodiment, the stopper 71 is provided on the piston 44. However, the present invention is not limited to this, and the stopper 71 may be provided on the one end face 50 as long as a gap can be formed between the piston 44 and the one end face 50. . Details of the stopper 71 will be described later.

The boot 81 has a bellows portion 84 having a configuration in which large-diameter crest portions 82 and small-diameter trough portions 83 are alternately arranged so as to be able to expand and contract in accordance with the advancing and retreating action of the rod 46. A vent hole 86 is formed at the top of the mountain portion 82 of the outer peripheral surface 85 of the boot 81 so as to be able to vent the inside and outside of the boot 81 when the boot 81 expands and contracts.

The boot 81 is in contact with the outer peripheral surface 64 of the attachment portion 53 of the damper main body 41 and the fitting portion 87 on the distal end side that is in contact (fitting) with the outer peripheral surface 64 of the contact member 51 of the damper main body 41 ( And a fitting portion 88 on the base end side. The boot 81 has a thick portion 89 that is thicker than the thickness of the bellows portion 84. The thick portion 89 is in contact with the outer peripheral surface 66 of the housing 42 and seals between the outer peripheral surfaces 65 and 66. Part 91.

The seal portion 91 is located closer to the attachment portion 53 than the through hole 45 of the housing 42. In a state in which the tailgate 13 (FIG. 2) is closed, the vent hole 86 is disposed below the boot 81 and is located closer to the through hole 45 than the seal portion 91. Since the vent hole 86 is disposed at the lower part of the boot 81, even if water flows from the top to the bottom through the passage 17 (FIGS. 1 and 3), water does not enter from the vent hole 86. Therefore, the damper main body 41 can be waterproofed by the boot 81.

Since the bellows portion 84 is between the seal portion 91 and the fitting portion 87, the bellows portion 84 expands and contracts following the forward / backward movement of the rod 46. Therefore, the seal portion 91 is not affected by the forward / backward motion of the rod 46. The sealing state can be maintained. In addition, since the through-hole 86 is located at the bottom of the boot 81 and at the top of the peak portion 82, even if water enters the boot 81, the water can be easily discharged.

The boot 81 has a held portion 92 that can be sandwiched between the mounting seat surface 34 of the bracket 30 and the mounting portion 53 of the damper main body 41 in a state of being mounted on the bracket 30. By sandwiching the holding portion 92 between the damper main body 41 and the mounting seat surface 34, the boot 81 can be strongly fixed to the damper main body 41. The held portion 92 includes a rotation restricting portion 93 that restricts relative rotational displacement with respect to the bracket 30. The rotation restricting portion 93 is fitted in the cutout portion 36 of the bracket 30. (Details will be described later)

Next, the piston 44 and the rod 46 will be described. As shown in FIG. 5, the piston 44 has a disk shape. A rod 46 extends from the end surface 72 of the piston 44 in the normal direction of the end surface 72.

The diameter of the piston 44 is larger than the diameter of the rod 46, and a stopper 71 is annularly provided at a corner between the end face 72 and the rod 46. Even if the rod 46 receives an external force that falls with respect to the piston 44, the stopper 71 is annular, so that it is reinforced in any direction, and the rod can be prevented from falling.

The piston 44 is provided with a plurality of reinforcing ribs 74 extending from the stopper 71 to the outer peripheral surface 73 on the end surface 72. The plurality of reinforcing ribs 74 extend radially from the stopper 71. Since the plurality of reinforcing ribs 74 extend radially, the entire surface of the piston 44 can be reinforced against the direction of the force received by the piston 44 when the rod 46 advances and retreats. As a result, it is possible to reduce the thickness of the piston 44 itself.

The piston 44 has a plurality of grooves 75 penetrating in the axial direction of the piston 44 on the outer peripheral surface 73. The groove 75 is disposed between the plurality of reinforcing ribs 74. By providing the groove 75, the rigidity of the piston 44 is lowered. However, since the reinforcing ribs 74 are provided on both sides of the groove 75, it is easy to compensate for the lowered rigidity.

Next, the rotation restricting portion 93 will be described. As shown in FIG. 6, the boot 81 has a projecting rotation restricting portion 93 at the end on the attachment portion 53 side. Since the rotation restricting portion 93 is a protrusion having a simple shape, the rotation restricting portion 93 can be integrally formed with the boot 81, and an increase in the manufacturing cost of the boot can be suppressed. Further, the rotation restricting portion 93 is arranged with a position shifted from the claw portions 61 and 61.

Next, the notch 36 will be described. As shown in FIG. 7, a circular damper mounting hole 35 is provided in the mounting seat surface 34 of the bracket 30. A cutout portion 36 is provided in a part of the damper mounting hole 35.

When attaching the opening / closing body damper 40 (FIG. 6) to the bracket 30, the rotation of the boot 81 can be restricted by inserting the rotation restricting part 93 of the boot 81 (FIG. 6) into the notch part. Further, the claw portion 61 (FIG. 6) of the attachment portion 53 is hooked at a position shifted from the notch portion 36 in the damper attachment hole 35.

Next, the operation of the stopper 71 of the damper 40 for opening and closing body will be described. As shown in FIG. 8, the piston 44 of the opening / closing body damper 40 is biased toward the one end face 50 side of the cylinder 43 in a state where the tailgate 13 (FIG. 1) is opened. The stopper 71 is in contact with the one end surface 50 of the cylinder 43. When the stopper 71 contacts the one end surface 50, a gap is formed between the piston 44 and the one end surface 50, and a fluid chamber 62 is formed on the left side of the piston 44 in the figure.

When the tailgate 13 is closed, the piston 44 moves as shown by the arrow b through the rod 46. Since the fluid chamber 62 is formed even in the initial stage of input to the opening / closing body damper 40, the initial flow path of the fluid flowing out from the fluid chamber 63 on the right side of the piston 44 to the fluid chamber 62 on the left side of the piston 44 in FIG. wide.

Even in the initial stage of input, the fluid flows smoothly from the fluid chamber 63 to the fluid chamber 62 through the groove 75 as indicated by an arrow c. As a result, the tailgate 13 can be closed without temporary resistance even in the initial stage of input, and the door opening / closing performance can be improved.

Next, the operation of the boot 81 will be described. FIG. 9A shows a state immediately before the opening / closing body damper 40 abuts against the damper receiving surface 24. The rod 46 is positioned at the slide limit by the biasing member 47. The boot 81 is in the most extended state, and the volume in the boot 81 is maximum.

FIG. 9B shows a state immediately after the opening / closing body damper 40 contacts the damper receiving surface 24. In the opening / closing body damper 40, the rod 46 is submerged in the through-hole 45 due to the impact abutting against the damper receiving surface 24. As the damper main body 41 contracts, the bellows portion 84 of the boot 81 contracts preferentially.

Although the volume in the boot 81 is reduced, the air in the boot 81 flows as indicated by an arrow d and is discharged from the vent hole 86 as indicated by an arrow e. Since the air in the boot 81 is discharged, the air pressure in the boot 81 does not increase and the boot 81 does not become an air spring. As a result, the damper main body 41 exhibits the original damper performance.

Next, a modified example of the damper for the opening / closing body will be described. In addition, the same code | symbol is attached | subjected about the same structure as the structure by the Example shown in FIG. 4, and detailed description is abbreviate | omitted. As shown in FIG. 10, the opening / closing body damper 40 includes a damper body 41 and a boot 81.

The bellows portion 84 is disposed so as to surround the through hole 45 and the rod 46. As the damper body 41 expands and contracts, the bellows portion 84 is expanded and contracted preferentially. Since the bellows portion 84 is separated from the seal portion 91 on the base end side of the boot 81, the bellows portion 84 is hardly affected by the expansion and contraction of the bellows portion 41. As a result, the sealing performance of the seal portion 91 can be further improved.

As shown in FIG. 4, the boot 81 has a seal portion 91 that seals between the outer peripheral surface of the damper main body 41 and a vent hole 86 that can ventilate the inside and outside of the boot 81 when the boot 81 expands and contracts. The boot 81 is in contact (fitted) with the outer peripheral surfaces 64, 65, 66 of the damper main body 41, and the damper 81 is sealed between the boot 81 and the damper main body 41 using the contact (fitting) portion. The main body 41 can be sufficiently waterproofed. Furthermore, since the vent hole 86 is provided in the outer peripheral surface 85 of the boot 81, when the damper main body 41 contracts, the air in the boot 85 is released to the outside from the vent hole 86, and the boot 81 is prevented from functioning as an air spring. . Therefore, the damper performance of the damper main body 41 can be sufficiently enhanced.

As shown in FIG. 4, the seal portion 91 is located closer to the attachment portion 53 than the through hole 45 with respect to the housing 42. Since the seal portion 91 is located closer to the attachment portion 53 than the through hole 45, even if water enters from the attachment portion 53, the water is sealed by the seal portion 91, and water enters before the seal portion 91. Can be prevented. As a result, since water does not reach the through hole 45, it is possible to prevent water from entering the housing 42 from the through hole 45.

As shown in FIG. 4, the bellows portion 84 is located closer to the through hole 45 than the seal portion 91. When the damper main body 41 expands and contracts, the rod 46 appears and disappears from the through hole 45 at the tip of the housing 42, so that the tip of the rod 46 and the tip of the housing 42 expand and contract. On the other hand, since the bellows portion 84 of the boot 81 expands and contracts preferentially, the portion that expands and contracts on the damper body 41 side and the portion that expands and contracts on the boot 81 side are both positioned closer to the through hole 45 than the seal portion 91. become. As a result, even if the damper main body 41 expands and contracts, the bellows portion 84 expands and contracts on the boot 81 side, and the seal portion 91 does not receive much external force in the expansion and contraction direction. It can seal and maintain sealing performance.

As shown in FIG. 4, the seal portion 91 is provided on the thick portion 89 of the boot 81. Since the thick part 89 is thicker than the thickness of the bellows part 84, it is less likely to be deformed than the bellows part 84 by an external force. Since the seal portion 91 is provided in the thick portion 89 that is not easily deformed, the seal portion 91 can improve the sealing performance.

As shown in FIG. 4, the vent hole 86 is formed in the peak portion 82 of the bellows portion 84. Since the bellows portion 84 has alternating ridges 82 and valleys 83 and has a undulating shape, even if the vent hole 86 is provided in the bellows portion 84, it is not noticeable. Therefore, it is possible to ensure the appearance of the opening / closing body damper 40.

As shown in FIG. 4, the vent hole 86 is disposed in the boot 81 so as to be positioned below the boot 81. Since the vent hole 86 is disposed in the lower portion of the boot 81 and formed in the peak portion 82, the vent hole 86 is disposed at the lowest position of the boot 81. As a result, since the vent hole 86 serves as a drain port, water can be discharged without accumulating in the bellows portion 84. Even if water enters the boot 81, the water that has entered can be immediately discharged from the vent hole 86.

As shown in FIGS. 4, 6, and 7, the boot 81 includes a held portion 92 that can be sandwiched between either the vehicle body 11 or the opening / closing body 13 and the damper main body 41. A rotation restricting portion 93 is provided on the held portion 92. Since the boot 81 is provided with the rotation restricting portion 93, the boot 81 does not rotate with respect to the vehicle body 11 and the opening / closing body 13, and the vent hole 86 can always be positioned below the boot 81. Further, the held portion 92 can be sandwiched between either the vehicle body 11 or the opening / closing body 13 and the damper main body 41, and is not visible from the outside. Since the rotation restricting portion 93 is also not visible, the appearance of the opening / closing body damper 40 can be ensured.

As shown in FIGS. 4 and 5, the one end surface 50 of the cylinder 43 is an end surface that defines a sliding limit to one side of the piston 44, and when the piston 44 slides to the sliding limit with respect to the one end surface 50. The piston 44 has a stopper 71 (position restricting portion 71) for providing a gap between the one end face 50 and the piston 44. Because the stopper 71 (position restricting portion 71) maintains the state where the one end surface 50 of the cylinder and the piston 44 are separated from each other, the fluid chamber 62 is provided on the one end surface 50 side of the piston 44 even at the initial stage of input to the opening / closing body damper 40. The initial flow path of the fluid flowing out from the fluid chamber 63 on the other end surface side of the piston 44 to the fluid chamber 62 on the one end surface 50 side can be widened. As a result, even in the initial stage of input to the opening / closing body damper 40, fluid easily flows and the load required at the initial stroke of the piston 44 does not increase. Therefore, the opening / closing performance of the door can be improved. In addition, since the stopper 71 (position restricting portion 71) is only provided on at least one of the piston 44, the rod 46, and the one end face 50 of the cylinder 43, the opening / closing body damper 40 can be configured simply.

As shown in FIG. 5, the stopper 71 (position restricting portion 71) is provided over both the piston 44 and the rod 46. Since the rod 46 is connected to the piston 44 by a stopper 71 (position restricting portion 71), the rigidity between the piston 44 and the rod 46 is improved, and the collapse between the rod 46 and the piston 44 is prevented. can do.

5, the diameter of the piston 44 is larger than that of the rod 46, and the stopper 71 (position restricting portion 71) is provided at a corner between the end surface 72 of the piston 44 and the rod 46. The stopper 71 (position restricting portion 71) increases the rigidity of the corner between the end surface 72 of the piston 44 and the rod 46.

4 and 5, the end surface 72 of the piston 44 is formed with at least one reinforcing rib 74 extending from the stopper 71 (position restricting portion 71) to the outer peripheral surface 73 of the piston 44. As shown in FIG. By providing the reinforcing rib 74, the entire radial direction of the piston 44 is reinforced, so that the rigidity in the radial direction can be maintained even if the thickness of the piston 44 itself is reduced. In addition, since the reinforcing rib 74 extends to the outer peripheral surface 73 of the piston 44, even if the piston 44 is inclined, the reinforcing rib 74 contacts the one end surface 50 of the cylinder 43 before the piston 44. The fluid chamber 62 can be secured on the one end face 50 side of 43. As a result, the initial flow path can be secured more.

As shown in FIG. 5, a groove 75 penetrating in the axial direction of the piston 44 is formed in the outer peripheral surface 73 of the piston 44, and the groove 75 is located between the plurality of reinforcing ribs 74. . Since the groove 75 is provided on the outer peripheral surface 73 of the piston 44, the amount of fluid flowing between the fluid chambers 62 and 63 on both sides of the piston 44 can be easily adjusted by changing the size of the groove 75. Therefore, the attenuation amount of the opening / closing body damper 40 can be easily adjusted. In addition, since the reinforcing ribs 74 are provided on both sides of the groove 75, the rigidity of the piston 44 can be reinforced even if the groove 75 is provided. Further, since the reinforcing ribs 74 are provided on both sides of the groove 75, there are a plurality of reinforcing ribs 74. Even if the piston 44 is inclined in any of the circumferential directions, any of the reinforcing ribs 74 is not provided. The fluid chamber 62 can be secured on the one end surface 50 side of the cylinder 43 by contacting the one end surface 50 of the cylinder 43. As a result, the initial flow path can be secured more.

In the embodiment, the damper 40 for the opening / closing body is provided in the opening / closing body 13 (tailgate 13). However, the present invention is not limited to this, and if the vent hole 86 of the boot 81 is disposed at the lower part of the boot 81, The damper 40 may be provided on the vehicle body 11.

The technology according to the present invention is suitable for a damper for an opening / closing body that cushions an impact when the opening formed in the vehicle body is closed by the opening / closing body.

DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Vehicle body, 12 ... Opening (rear opening), 13 ... Opening / closing body (tailgate), 40 ... Opening / closing body damper, 41 ... Damper main body, 42 ... Housing, 43 ... Cylinder, 44 ... Piston, 45 DESCRIPTION OF SYMBOLS ... Through-hole, 46 ... Rod, 47 ... Biasing member, 50 ... One end surface of a cylinder, 53 ... Mounting part, 62 ... Fluid chamber on one end surface side, 63 ... Fluid chamber on the other end surface side, 66 ... Outer circumference of damper body 71, stopper (position restricting portion), 72 ... end face of piston, 73 ... outer peripheral surface of piston, 74 ... reinforcing rib, 75 ... groove, 81 ... boot, 82 ... mountain, 83 ... valley, 84 ... A bellows part, 85 ... outer peripheral surface of the boot, 86 ... a vent, 89 ... a thick part, 91 ... a seal part, 92 ... a pinched part, 93 ... a rotation restricting part.

Claims (12)

A damper for an opening and closing body,
A damper body attached to one of a vehicle body and an opening / closing body that opens and closes an opening formed in the vehicle body, and abutting against the other;
A boot configured to cover at least a stretchable portion of the damper main body, and is made of an elastic material capable of expanding and contracting according to the expansion and contraction action of the damper main body;
It has
The boot is formed in a portion in contact with the outer peripheral surface of the damper main body, and is formed on a seal portion that seals between the outer peripheral surface and the outer peripheral surface of the boot. A damper for an opening and closing body, characterized by having a ventilation hole that allows ventilation inside and outside. The damper main body includes a housing having a mounting portion that can be attached to either the vehicle body or the opening / closing body, and a rod that is built in the housing so as to be able to advance and retreat and can be retracted from a through hole of the housing. And
The rod is in contact with either the vehicle body or the opening / closing body,
The seal portion is located on the attachment portion side with respect to the housing from the through hole,
The damper for an opening / closing body according to claim 1, wherein the vent hole is located on the side of the through hole with respect to the boot with respect to the seal portion. The boot has an accordion portion having a configuration in which large-diameter ridges and small-diameter troughs are alternately arranged so that the rod can be expanded and contracted according to the forward and backward movement of the rod,
The opening / closing body damper according to claim 2, wherein the bellows part is located closer to the through hole than the seal part. The boot has a thick part thicker than the thickness of the bellows part,
The damper for an opening / closing body according to claim 3, wherein the seal part is provided in the thick part. The damper for an opening / closing body according to claim 3 or 4, wherein the vent hole is formed in the peak portion of the bellows portion. The opening / closing body according to any one of claims 1 to 5, wherein the ventilation hole is arranged in the boot so that the opening is positioned at a lower portion of the boot when the opening is closed by the opening / closing body. Damper. The boot is sandwiched between the damper body and the damper body when the damper body is attached to either the vehicle body or the opening / closing body. The said clamping part has a rotation control part which can control the relative rotational displacement of the said boot with respect to any one of the said vehicle body and the said opening-closing body. Opening / closing body damper described in 1. An opening / closing body damper having a damper main body attached to any one of a vehicle body and an opening / closing body for opening / closing an opening formed in the vehicle body,
The damper body is
A housing attachable to one of the vehicle body and the opening and closing body;
A cylinder formed inside the housing;
A rod that is built in the housing so as to be able to advance and retreat, is provided so as to be able to protrude and retract from a through hole of the housing, and a rod that can contact either the vehicle body or the opening and closing body;
A piston provided integrally with the rod and slidably fitted inside the cylinder to partition the inside of the cylinder into two fluid chambers in the axial direction;
A biasing member that biases the piston toward one end surface in the axial direction of the cylinder;
A stopper for restricting the one end surface of the cylinder and the piston to be separated from each other when the rod is not in contact with the other of the vehicle body and the opening / closing body;
With
The stopper for an opening / closing body, wherein the stopper is located on at least one of the piston, the rod, and the one end surface of the cylinder. The opening / closing body damper according to claim 8, wherein the stopper is provided over both the piston and the rod. 10. The opening / closing body damper according to claim 9, wherein the diameter of the piston is larger than that of the rod, and the stopper is provided at a corner between the end face of the piston and the rod. The opening / closing body damper according to claim 10, wherein at least one reinforcing rib extending from the stopper to the outer peripheral surface of the piston is formed on the end surface of the piston. The reinforcing ribs are plural, and a groove penetrating in the axial direction of the piston is formed on the outer peripheral surface of the piston, and the groove is located between the plurality of reinforcing ribs. The damper for opening and closing bodies according to claim 11.

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