JP2015200358A - damper structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper device for preventing a clamp member from being removed from a ball joint.SOLUTION: A pair of claws 26, 28 of a clamp member 24 fitted to a ball joint 14 are arranged to be inclined by an angle of θ with respect to a direction crossing at a right angle with an axial direction of a fixing rod 21 as seen from an axial direction of a supporting body 13 for the ball joint 14. As a result, even if a damper stay 12 is axially rotated, expansion of the claws 26, 28 is restricted and at the same time, even if a force is applied to cause a socket 16 to be spaced apart from the ball joint 14, the clamp member 24 is prevented from being dropped from the ball joint 14.

Description

  The present invention relates to a damper structure.

  2. Description of the Related Art Conventionally, a damper structure that connects a ball joint and a socket side by fitting the ball joint to a clamp member disposed inside the socket is known (for example, see Patent Document 1).

  Such a damper structure is adopted, for example, in a damper stay of a back door of a vehicle, and a ball joint is accommodated in a socket integrally provided at the tip of a damper stage having a screw-type and retractable rod. It is clamped by the mounted clamp member.

  The clamp member is connected to the ball joint by the pair of claws gripping the ball joint. The arrangement of the pair of claw portions of the clamp member is a direction perpendicular to the axial direction of the damper stay in the axial direction view of the support body of the ball joint.

Japanese Utility Model Publication No. 2-114213

  By the way, the screw type damper stay has a structure in which the rod expands and contracts when the screw component rotates, and therefore a torsional moment acts on the damper stay. As a result, a torsional moment also acts on the socket and the clamp member provided at the tip of the damper stay.

  Therefore, when the pair of claws slide on the ball joint, the direction of the rotational moment acting relatively from the ball joint to the claws coincides with the expansion direction of the pair of claws, and the claws are mutually connected. It is easy to separate (expand). At this time, if the socket is subjected to an action of force in the direction away from the ball joint, the clamp member that is open may be detached from the ball joint.

  In view of the above-described facts, an object of the present invention is to provide a damper device that prevents the clamp member from being detached from the ball joint.

  According to the first aspect of the present invention, a ball joint provided at the tip of the support body and a tip of a mounting rod on which a rotational moment around the axis acts are orthogonal to the mounting rod axis in the axial view of the support body. A socket that is opened in a direction to be mounted, and is mounted on the ball joint, is attached to the socket, sandwiches the ball joint, and is perpendicular to the axial direction of the mounting rod in the axial direction of the support body. And a clamp member having a pair of claw portions disposed at a predetermined distance apart in the radial direction inclined at a predetermined angle around the axis of the support.

  In this damper device, when a rotational moment (torsional moment) around the axis acts on the mounting rod, a rotational moment around the shaft acts on the socket provided at the tip of the mounting rod and the clamp member attached to the socket. become. As a result, the pair of claws holding the ball joint from the outside slides on the spherical surface of the ball joint. Here, the pair of claws of the clamp member are inclined at a predetermined angle (including 90 degrees) around the axis of the support relative to the direction orthogonal to the axial direction of the mounting rod in the axial direction of the support of the ball joint. In this direction, they are spaced apart by a predetermined distance. Accordingly, the distance from the rotation axis of the mounting rod is smaller than when the claw portion is disposed in a direction perpendicular to the axial direction of the mounting rod, and the rotational moment acting from the ball joint due to sliding is suppressed. . In addition, the direction of rotation moment acting on the claw portion (clamp member) is different from the direction in which the claw portion is expanded. Therefore, even if a force is applied to the socket in the direction away from the ball joint simultaneously with the action of the rotational moment from the mounting rod, the expansion of the claw portion is suppressed and the fitting of the clamp member to the ball joint is maintained.

  Since the present invention has the above configuration, it is possible to prevent the clamp member from being detached from the ball joint.

It is a disassembled perspective view of the damper device concerning one embodiment of the present invention. FIG. 4 is a sectional view taken along line 2-2 in FIG. 3. 3A is a cross-sectional view taken along line 3A-3A in FIG. 2, and FIG. 3B is an axial view of the damper stay of the damper device according to the embodiment of the present invention. In the damper device according to the comparative example, (A) is a side view in the axial direction of the support body of the ball joint, and (B) is an explanatory diagram of an arrangement state of the claw portion with respect to the ball joint.

  A damper device according to an embodiment of the present invention will be described with reference to FIGS.

  Hereinafter, in each drawing, an arrow FR indicates the front of the vehicle, an arrow UP indicates the vehicle upper direction, and an arrow W indicates the vehicle width direction.

  As shown in FIG. 1, the damper device 10 according to the present embodiment can be applied to a case where a damper stay 12 used for opening and closing a back door of a vehicle is attached to the vehicle body side.

  That is, the ball joints 14 are provided on the left and right frame portions constituting the opening of the vehicle main body that is opened and closed by the back door via the mounting and fixing brackets and the support body 13 as shown in FIGS. ing. A flat surface 30 is formed at the tip of the ball joint 14. As shown in FIG. 2, the flat surface 30 is formed so as not to coincide with the maximum diameter portion 38 of the ball joint 14.

  The damper stay 12 is, for example, a double cylinder type, and has a piston rod that expands and contracts when a screw component constituting the damper stay 12 rotates. The upper end portion of the piston rod is connected to the inner surface of the back door via an attachment fixing bracket.

  Further, as shown in FIGS. 1 and 3A, a substantially hollow hemispherical socket 16 that covers the ball joint 14 is integrally provided via a mounting rod 21 at the lower end of each damper stage 12. Yes. The socket 16 is open on the direction side perpendicular to the axial direction of the mounting rod 21 and covers the ball joint 14 from the inner side in the vehicle width direction.

  As shown in FIG. 2, the spherical surface portion 22 of the socket 16 is formed with slits 18 and 20 into which a pair of claws 26 and 28 of a clamp member 24 to be described later can be inserted at a predetermined interval. Yes. The slits 18 and 20 have a length slightly larger than the width of the clamp member 24 (the claw portions 26 and 28) (the length in the direction perpendicular to the paper surface) and can allow the claw portions 26 and 28 to expand. It is formed with a wide interval (width).

  Note that the claw portions 26 and 28 of the clamp member 24 configured as described above and the slits 18 and 20 of the socket 16 are, as shown in FIG. 3A, in the axial direction view of the support 13 of the ball joint 14. It is arranged in a direction inclined by an angle θ around the axis of the support 13 with respect to the direction perpendicular to the axial direction of the damper stay 12 (mounting rod 21). Here, the angle θ includes 90 degrees. When the angle θ is 90 degrees, the mounting rod 21 may be shaped to avoid the clamping member 24 so that the mounting rod 21 and the clamping member 24 do not interfere with each other.

  As shown in FIG. 2, the clamp member 24 is formed of a metal such as iron (spring steel) in a substantially “C” shape in cross-section, and has an inner surface formed along the outer surface 22 </ b> A of the spherical portion 22 of the socket 16. A pair of claw portions 26 each extending inwardly so as to approach each other (in a state inclined at a predetermined angle) from the longitudinal direction both end portions of the main body portion 34, and 34A 28.

  Therefore, when the claw portions 26 and 28 are expanded, an inward force is generated in the claw portions 26 and 28, whereby the clamp member 24 is held by the socket 16. . That is, when the claw portions 26 and 28 are inserted into the slits 18 and 20, respectively, the claw portions 26 and 28 are expanded by the inner side edge portions of the slits 18 and 20.

  Therefore, when the claw portions 26 and 28 are inserted into the slits 18 and 20 and the inner surface 34A of the main body portion 34 is attached to the outer surface 22A of the spherical surface portion 22, the claw portion is caused by the inward force generated by the expanding operation. The inner surfaces of 26 and 28 are in pressure contact (contact) with the slits 18 and 20, and the clamp member 24 is engaged and held on the outer surface 22 A side of the spherical portion 22 of the socket 16.

  Further, the claw portions 26 and 28 of the clamp member 24 are fitted to the ball joint 14 on the inner surface 22B side of the spherical surface portion 22 of the socket 16, as shown in FIG. That is, when the claw portions 26 and 28 of the clamp member 24 protruding into the socket 16 are fitted to the ball joint 14 from the front end portion (flat surface 30) side, the front end portions 26A of the claw portions 26 and 28, 28 </ b> A is expanded by the spherical portion 36 that continues from the flat surface 30.

  When the tip portions 26A, 28A of the claw portions 26, 28 exceed the maximum diameter portion 38 of the spherical surface portion 36 of the ball joint 14, due to the restoring force (elastic force) of the expanded claw portions 26, 28 The tip portions 26A, 28A are locked to the ball joint 14. As a result, the clamp member 24 is fitted into the ball joint 14 and the socket 16 is put on the ball joint 14 and held.

  Next, the operation of the damper device 10 will be described. First, the comparative example shown in FIG. 4 will be described. In addition, about the damper apparatus of a comparative example, about the component similar to the damper apparatus 10 of this embodiment, the reference number which added 100 to the same referential mark is attached | subjected, and the detailed description is abbreviate | omitted.

  As shown in FIG. 4A, in the damper device 100, the arrangement direction of the claw portions 126 and 128 of the clamp member 124 and the slits 118 and 120 of the socket 116 in the axial direction view of the support 113 of the ball joint 114 is The only difference from the damper device 10 is that the direction is perpendicular to the direction of the axis CL of the damper stage 112.

  In the damper device 100 configured as described above, the clamp member 124 is connected to the ball joint 114 by the nail portions 126 and 128 sandwiching the ball joint 114. In the screw type damper stage 112, the rod expands and contracts by the rotation of the screw component. As a result, a torsional moment acts on the damper stay 112, and the rotation moment about the axis CL of the damper stay 112 also acts on the socket 116 provided at the tip of the damper stay 112 and the clamp member 124 attached to the socket 116. As shown in FIG. 4B, when the rotational moment acts clockwise (in the direction of arrow CW), the claw portions 126 and 128 positioned at the maximum diameter portion 138 are separated from each other, that is, in the direction of expanding. And the direction of action of the rotational moment match.

  Further, as shown in FIG. 4B, when a force F that pulls the socket 116 inward in the vehicle width direction is applied, the claw portions 126 and 128 that are applied with the force so as to expand are provided. There is a possibility that the connection between the socket 116 and the ball joint 114 is released through the maximum diameter portion 138 of the ball joint 114.

  On the other hand, the damper device 10 of the present embodiment is inclined by an angle θ around the axis of the support 13 with respect to a direction orthogonal to the axial direction of the damper stage 12 in the axial direction of the support 13 of the ball joint 14. The claw portions 26 and 28 of the clamp member 24 and the slits 18 and 20 of the socket 16 are arranged in the above direction.

  In this case, when the rod expands and contracts due to the rotation of the screw component of the damper stage 12, a torsional moment is applied to the damper stage 12, and the damper 16 is also attached to the socket 16 provided at the tip of the damper stage 12 and the clamp member 24 attached to the socket 16. Twelve rotational moments around the axis CL act. Along with this, the claw portions 26 and 28 slide on the spherical surface portion 36 of the ball joint 14 around the axis CL of the damper stage 12, and a rotational moment acts on the claw portions 26 and 28 from the ball joint 14. In this case, the claw portions 26 and 28 are inclined by an angle θ around the axis of the support 13 with respect to the direction orthogonal to the axial direction of the damper stage 12. Therefore, the radius R1 (see FIG. 3B), which is the shortest distance from the claw portions 26 and 28 to the ball joint contact point P1 with respect to the rotation center axis CL, is the ball of the claw portions 126 and 128 with respect to the rotation center axis CL of the comparative example. It is shorter than the radius R2 (see FIG. 4B) which is the shortest distance to the joint contact point P2. As a result, the relative rotational moment acting on the claw portions 26 and 28 sliding on the spherical surface portion 36 of the ball joint 14 is reduced, and the expanding direction of the claw portions 26 and 28 and the acting direction of the rotational moment are the support body. The claw portions 26 and 28 are difficult to expand because the angle θ is shifted around the 13 axis.

  As a result, even if a force F acts on the socket 16 in the vehicle width direction at the same time, the clamp member 24 can be prevented from falling off the ball joint 14.

  In the present embodiment, the ball joint 14 having a part of the sphere having the flat surface 30 is used. However, the present invention is not limited to this. The whole may have a spherical shape, or may have another shape. Moreover, although the clamp member 24 was also made into C ring shape, it is not limited to this.

  Furthermore, although this embodiment demonstrated the case where a damper apparatus was used for the damper stage of the back door of a vehicle, it is not limited to this. That is, the present invention can be applied to any configuration in which a ball joint is used to connect an object and a main body whose rotational moment acts on the mounting rod side.

DESCRIPTION OF SYMBOLS 10 Damper apparatus 13 Support body 14 Ball joint 16 Socket 21 Mounting rod 26, 28 Claw part

Claims (1)

A ball joint provided at the tip of the support,
A socket provided at the tip of a mounting rod on which a rotational moment around the axis acts, opened in a direction perpendicular to the mounting rod axis in the axial direction of the support, and covered with the ball joint;
A predetermined distance in a radial direction that is mounted on the socket and sandwiches the ball joint and is inclined at a predetermined angle around the axis of the support relative to a direction orthogonal to the axial direction of the mounting rod in the axial direction of the support. A clamp member having a pair of claw portions spaced apart from each other;
A damper device comprising:

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