JPWO2014033980A1 - Damper - Google Patents

Abstract

The damper includes a piston, a cylinder having a partition wall 52 in which a piston is inserted from one end side and a vent hole 44 is formed on the other end side to communicate the inside and outside, and a valve body 60 provided on the other end side of the cylinder. . The cylinder protrudes from the partition wall 52 of the cylinder so as to surround the vent hole 44, and has a first cylinder portion 38 having an opening that communicates with the vent hole 44, and a cylinder surrounding the first cylinder portion 38 from the partition wall 52. And a second cylinder portion 40 protruding in a shape. The second cylindrical portion 40 includes a plurality of protrusions 42 formed on the inner peripheral surface and arranged in the circumferential direction. The valve body 60 is loosely fitted between the plurality of protrusions 42 and the tip of the first cylinder part 38, and comes into contact with the tip of the first cylinder part 38 when a negative pressure is generated in the cylinder. The air hole 44 is closed.

Description

  The present invention relates to a damper that generates a damping force in accordance with movement of a piston.

  A damper is provided on the lid member of the glove box of the vehicle. The damper acts to open the lid member gently by a damping force, while acting so that the lid member can be easily closed without much resistance when the lid member is closed.

  For example, Patent Document 1 discloses a cylinder, a piston that is slidably in contact with the inner wall surface of the cylinder, a valve that is formed on the rear wall of the cylinder and closes a circulation hole that ventilates the inside and outside of the cylinder, And a retainer that supports the valve and the spring.

Japanese Utility Model Publication No. 5-58996

  In the technique described in Patent Document 1, a separate retainer is used to attach the valve to the cylinder, the number of parts of the damper increases, and the number of mounting steps of the valve also increases.

  This invention is made | formed in view of such a subject, The objective is to reduce the number of parts and to provide the damper which can attach a valve body easily.

  In order to solve the above problems, a damper according to an aspect of the present invention includes a piston, a cylinder having a partition wall in which a piston is inserted from one end side and a vent hole is formed on the other end side to communicate the inside and the outside. And a valve body provided on the other end side. The cylinder protrudes in a cylindrical shape surrounding the vent hole from the partition wall of the cylinder, and has a cylindrical shape surrounding the first cylinder portion from the cylinder partition wall, the first cylinder portion being an opening communicating with the vent hole. And a second tube portion projecting from. A plurality of second cylindrical portions are formed on the inner peripheral surface and have protrusions arranged in the circumferential direction. The valve body is loosely fitted between the plurality of protrusions and the tip of the first cylinder part, and when the inside of the cylinder becomes negative pressure, the valve body comes into contact with the tip of the first cylinder part, thereby close up.

  According to this aspect, the valve body is pushed between the plurality of protrusions and the first tube portion, and the attachment work of the valve body is facilitated. When the valve body is pushed in, the valve body is raised from the partition wall by the first tube portion, so that the periphery of the valve body that does not contact the tip of the first tube portion is closer to the partition wall side than the tip of the first tube portion. It becomes possible to bend, and it can make it easy for the periphery of a valve body to get over a protrusion. In addition, since the valve body is brought into contact with the tip of the first cylinder portion, the contact area between the cylinder and the valve body is reduced, and even if irregularities occur due to manufacturing errors on the surface of the valve body, the opening of the valve body and the vent hole Can be secured. Moreover, since it can suppress that a valve body remove | deviates by a some protrusion and a 1st cylinder part, another component is not required but a number of parts can be suppressed.

  According to the present invention, the number of parts of the damper can be reduced, and the valve body can be easily attached to the cylinder.

It is an assembly drawing of the damper concerning an embodiment. It is sectional drawing of a cylinder. Fig.3 (a) shows the perspective view of the damper of the state before attaching a valve body, FIG.3 (b) shows the perspective view of the damper of the state which attached the valve body. It is a figure for demonstrating attachment of a valve body.

  FIG. 1 is an assembly diagram of a damper 10 according to the embodiment. The damper 10 is attached to a glove box of a vehicle, for example, and applies a damping force to open / close the opening / closing member (lid member) of the glove box. The damper 10 includes a piston rod 20, a cylinder 30, and a valve body 60.

  The cylinder 30 is formed in a bottomed cylindrical shape. The piston rod 20 is inserted into the cylinder 30. The piston rod 20 includes a piston 22 that partitions the cylinder 30 and a rod 24. A seal ring may be provided on the outer periphery of the piston 22. One end of the rod 24 is fixed to the piston 22, and the connecting portion 26 at the other end is directly or indirectly connected to the opening / closing member. The piston 22 is inserted into the cylinder 30 to contact the inner surface of the cylinder 30 and reciprocate according to the operation of the opening / closing member.

  The cylinder 30 includes a main body portion 32, an attachment portion 34, and a lid portion 36. The cylinder 30 is fixed to the box of the glove box by the mounting portion 34. The attachment portion 34 is provided on the side surface of the main body portion 32. A lid portion 36 is provided at one end of the cylinder 30 to close the gap between the inserted piston rods 20. That is, a notch 36 a corresponding to the outer diameter of the rod 24 is formed in the center of the lid portion 36, and the lid portion 36 surrounds the outer periphery of the rod 24 received in the notch 36 a and closes one end of the cylinder 30. Thereby, the axial blurring of the rod 24 can be suppressed.

  A partition wall is provided at the other end of the cylinder 30, and a vent hole is formed in the partition wall. A separate valve body 60 is attached to the opening of the vent hole. The valve body 60 is formed in a disk shape from a flexible rubber material.

  FIG. 2 is a cross-sectional view of the cylinder 30. FIG. 2 is a cross-sectional view in which the center of the cylinder 30 is cut out in the axial direction, and shows a state in which the lid portion 36 is omitted. A vent hole 44 is formed in the center of the partition wall 52 of the cylinder 30.

  The internal space of the main body 32 of the cylinder 30 is divided into a first chamber 48 and a second chamber 50 by the piston 22. The first chamber 48 is formed with a small vent hole 44, but other portions are sealed. The second chamber 50 is opened to the outside by a gap between the rod 24 and the lid portion 36. The piston 22 slides in the body portion 32 in the axial direction.

  On the outer surface of the partition wall 52, a first tube portion 38 and a second tube portion 40 formed in a cylindrical shape so as to surround the first tube portion 38 are formed. The first cylindrical portion 38 is formed in a cylindrical shape, and the tip is an opening 38 a of the vent hole 44.

  A plurality of second cylindrical portions 40 are formed on the inner peripheral surface, and are formed with protrusions 42 arranged in the circumferential direction and a molding hole 46 for forming the protrusions 42. The projecting portion 42 projects inward in the radial direction, and the projecting end of the projecting portion 42 is located on the radially outer side from the tip of the first tube portion 38, and is located on the outer side in the axial direction from the tip of the first tube portion 38. The protrusion 42 is formed on the outer side in the axial direction from the tip of the first tube portion 38, so that a space into which the valve body 60 enters is formed.

  FIG. 3A shows a perspective view of the damper 10 before the valve body 60 is attached, and FIG. 3B shows a perspective view of the damper 10 with the valve body 60 attached. As shown in FIG. 3A, the periphery of the opening 38a of the first tube portion 38 is formed flat with a predetermined width at the upper end surface. Thereby, the valve body 60 becomes easy to adhere to the opening 38a. Moreover, if the shape of the contact part with the opening 38a is ensured, the valve body 60 can ensure the adhesiveness to the opening 38a even if a manufacturing error etc. arise in another part.

  A very small groove 38 b is formed in the opening 38 a of the first cylindrical portion 38. Thus, when the valve body 60 closes the opening 38a, the groove 38b functions as an orifice. As the negative pressure in the first chamber 48 in the cylinder 30 increases, the valve body 60 enters the groove 38b and the opening of the orifice is narrowed, so that the damper 10 generates a greater damping force. By forming the groove portion 38b in this manner, it is advantageous in that the opening area of the groove portion 38b can be adjusted according to the negative pressure as compared with the case where the groove portion 38b is not provided and the surface of the opening 38a is completely flat. is there.

  In the state where the valve body 60 is attached as shown in FIG. 3B, the opening 38 a is covered with the valve body 60. The movement of the valve body 60 away from the opening 38a is restricted by the protrusion 42.

  FIG. 4 is a view for explaining the attachment of the valve body 60. 4A and 4B show a state where the valve body 60 is being attached, and FIG. 4C shows a state where the valve body 60 is attached.

  The valve body 60 is pushed toward the opening 38 a by the jig 80, the central portion of the valve body 60 abuts on the first tube portion 38, and the edge of the valve body 60 is pushed by the jig 80 to project the protrusion 42. Is disposed between the plurality of protrusions 42 shown in FIG. 4C and the tip of the first tube portion 38. An annular protrusion 80a for pushing the peripheral edge of the valve body 60 is formed at the tip of the jig 80 shown in FIG.

  As shown in FIG. 4C, the valve body 60 is formed to be larger than the diameter of the inscribed circle of the plurality of protrusions 42. Therefore, it is necessary to bend the valve body 60 in order to exceed the plurality of protrusions 42. On the other hand, after the attachment, the valve body 60 needs to have a predetermined rigidity so that the valve body 60 is not bent and easily detached. Even such a rigid valve body 60 can be easily attached by using the jig 80. When the valve body 60 is a polygon or the like, the diameter of the circumscribed circle of the valve body 60 is the diameter of the valve body 60.

  The projecting end of the projecting portion 42 is located on the radially outer side from the tip end of the first tube portion 38. Furthermore, the difference between the diameter of the inscribed circle of the plurality of protrusions 42 and the outer diameter of the tip of the first tube part 38 is formed so as to ensure a dimension that the width of the annular protrusion 80a of the jig 80 can enter. Thereby, the annular protrusion 80a can enter between the protrusion 42 and the first cylinder part 38, and the edge of the valve body 60 can be pushed in. By providing the first tube portion 38, the edge of the valve body 60 can be bent toward the partition wall 52 from the tip of the first tube portion 38.

  As shown in FIG. 4B, the shortest distance 82 between the tip of the first tube portion 38 and the protrusion 42 is twice or more the plate thickness of the valve body 60. Thereby, the valve body 60 can bend | fold between the front-end | tip of the 1st cylinder part 38, and the protrusion 42, and can pass through, and the pushing at the time of attachment is easy.

  As shown in FIG. 4C, the valve body 60 is loosely fitted between the plurality of protrusions 42 and the tip of the first tube portion 38. The loose fitting means that the valve body 60 is slightly movable in the axial direction between the plurality of protrusions 42 and the first cylindrical portion 38, although the movement in the axial direction is limited by the plurality of protrusions 42 and the first cylindrical portion 38. The distance from the tip of the first tube portion 38 to the lower end of the protrusion 42 in the axial direction is larger than the plate thickness of the valve body 60. The lower end of the protrusion 42 refers to the end of the protrusion 42 on the partition wall 52 side. As a result, when the pressure in the first chamber 48 increases, the valve body 60 can move away from the tip of the first tubular portion 38 and open the vent hole 44. On the other hand, when the negative pressure in the first chamber 48 increases, the valve body 60 is attracted by the negative pressure and abuts against the tip of the first cylindrical portion 38 to substantially close the vent hole 44. Thus, since the valve body 60 is in a free state and is movable in the axial direction, the opening 38a can be opened and closed.

  The height of the first cylindrical portion 38 is larger than the length of the protrusion 42 protruding radially inward from the inner peripheral surface of the first cylindrical portion 38. With this configuration, when the valve body 60 is pushed to the side of the one projecting portion 42 to the maximum while being in contact with the inner peripheral surface of the first cylindrical portion 38, the valve overlaps with the projecting portion 42 in the radial direction. The edge of the body 60 can bend toward the partition wall 52 side from the first cylindrical portion 38, and the valve body 60 can be easily attached.

  In the damper 10 of the embodiment, when the piston 22 is pushed and the pressure in the first chamber 48 is increased, the gas in the first chamber 48 is released from the vent hole 44 to suppress the damping force, and the piston 22 is pulled and the first chamber 48 is pulled. When the pressure at 48 is lowered, the vent hole 44 is closed to increase the damping force. In the glove box, when the lid member is opened, the piston 22 is pulled and slowly opened, and when the lid member is closed, the piston 22 is pushed and easily closed.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added to the embodiments based on the knowledge of those skilled in the art. Embodiments described may also be included within the scope of the present invention.

  In the embodiment, when the piston 22 is pushed, the damping force generated from the damper 10 is small, and when the piston 22 is pulled, the damping force generated from the damper 10 is large. However, the present invention is not limited to this mode. . For example, in a modified example, the damper may be configured such that when the piston 22 is pushed, the damping force generated from the damper 10 is large, and when the piston 22 is pulled, the damping force generated from the damper 10 is small. The damper of the modified example can be realized by attaching the valve body 60 to the opening of the vent hole 44 from the first chamber 48 side so as to be opened and closed.

  10 damper, 20 piston rod, 22 piston, 24 rod, 26 connecting portion, 30 cylinder, 32 body portion, 34 mounting portion, 36 lid portion, 38 first tube portion, 38a opening, 38b groove portion, 40 second tube portion, 42 Protrusions, 44 Vent holes, 46 Vent holes, 48 First chamber, 50 Second chamber, 52 Partition wall, 60 Valve body, 80 Jig

  The present invention relates to a damper that generates a damping force in accordance with movement of a piston.

Claims (4)

A piston,
A cylinder having a partition wall in which the piston is inserted from one end side and a vent hole is formed on the other end side to communicate the inside and outside;
A valve body provided on the other end side of the cylinder,
The cylinder is
A first cylindrical portion that protrudes in a cylindrical shape surrounding the vent hole from the partition wall of the cylinder, and whose tip is an opening that communicates with the vent hole;
A second cylindrical portion projecting in a cylindrical shape surrounding the first cylindrical portion from the partition wall of the cylinder,
A plurality of the second cylindrical portions are formed on the inner peripheral surface, and have protrusions arranged in the circumferential direction.
The valve body is loosely fitted between the plurality of protrusions and the tip of the first cylinder part, and contacts the tip of the first cylinder part when the inside of the cylinder becomes negative pressure. Damper characterized by closing the vent hole. The valve body is formed so as to be larger than an outer diameter of a tip end of the first cylindrical portion and a diameter of an inscribed circle of the plurality of protrusions,
2. The damper according to claim 1, wherein the first cylindrical portion is formed such that an outer diameter of a tip is smaller than a diameter of an inscribed circle of the plurality of protrusions. The valve body is made of a flexible plate material,
The damper according to claim 1 or 2, wherein the shortest distance between the tip of the first tube portion and the protrusion is at least twice the plate thickness of the valve body. The valve body is pushed between the plurality of protrusions and the tip of the first tube part by being pushed in by a jig having an annular protrusion at the tip during assembly,
2. The difference between the diameter of the inscribed circle of the plurality of protrusions and the outer diameter of the first cylindrical portion is formed so as to ensure a dimension into which the annular protrusion of the jig enters. 4. The damper according to any one of 3 to 3.

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