JP6784482B2 - Ball joint - Google Patents

Description

The present invention relates to a ball joint.

The ball joint is provided at the end of the damper, for example, when the damper is installed between the pillar of the structure to be vibration-controlled and the beam, or between the structure and the ground, and the damper is attached to the mounting location. Used as a joint to connect. Since the ball joint is a joint that allows precession and rotation, it is suitable for setting in a place where the direction of relative movement is not restricted.

However, when the damper is a rotary inertial mass damper that exerts a damping force due to the inertia of the rotary weight, if a ball joint is used at the joint, the rotation of the rod in the damper is allowed, so that the rotary weight can rotate. The damping force cannot be exerted.

Therefore, an elongated hole along the axial direction of the ball stud is provided in the ball of the ball joint, and the tip of a bolt screwed from the outside of the housing holding the ball is inserted into the elongated hole to be around the ball stud axis of the ball. A ball joint that restrains rotation has been developed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-031822

In the conventional ball joint, the precession of the ball stud is allowed, but the rotation around the axis is prevented. Therefore, even if it is applied to the rotational inertia mass damper, the damper can exert a damping force and the relative movement of each other. It is also suitable for attaching a damper to a vibration-damped object whose direction is not restricted.

However, in the conventional ball joint, since the bolt for restraining the rotation of the ball stud around the axis is attached from the outside of the housing, it is provided in the lubricating oil housing filled between the ball and the housing. A seal is required to prevent leakage from the bolt holes, and it is disadvantageous in terms of rust prevention. Further, since the bolt holes are provided in the housing, it is disadvantageous in terms of strength.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is that even if the rotation of the ball stud around the axis can be prevented, a seal is not required, and a rust-preventive surface and a strength surface. It is the provision of ball joints that are advantageous in Japan.

In order to achieve the above-mentioned object, the ball joint is provided with a pin provided on the ball and a groove on the inner circumference of the bracket into which the pin is inserted, so that the ball can be prevented from rotating around the axis of the ball stud. Further, in the ball joint of the present invention, the bracket has a tubular housing that wraps the ball and allows the ball stud to protrude from one end, and a lid that closes the other end of the housing, and has a groove. is formed in a straight line along the axial direction of the ball stud over the other end in the middle of the inside of the housing, the other end opening adopts a configuration which is closed by the lid. As described above, in the ball joint of the present invention, all the structures for preventing the rotation of the ball stud around the axis are housed in the bracket, so that a separate seal is not required and the outside of the bracket There is no need to make a hole from the side to the inside. Further, in the ball joint of the present invention, since the rotation of the ball stud of the ball around the axis is prevented, the rotary inertial mass damper can be used for the joint portion, and the total length of the rotary inertial mass damper can be shortened. ..

Further, in the ball joint of claim 2, the groove is a long groove along the axial direction of the ball stud, the length of the groove is longer than the diameter of the pin, and the width is such that the side surface of the pin is in sliding contact with the pin. It is set. In this way, the ball joint regulates only the rotation of the ball stud around the axis, but allows precession, so that the dampers provided between the two members whose relative movement directions are not regulated are joined. Suitable for the part.

According to the ball joint of the present invention, even if it is possible to prevent the rotation of the ball stud around the axis, a seal is not required and it is not necessary to provide a hole in the bracket to prevent rotation, which is advantageous in terms of rust prevention. It becomes. Further, as compared with the conventional ball joint, the bracket does not have a hole for inserting a bolt, which is advantageous in terms of strength.

It is a vertical sectional view of the ball joint in one embodiment. It is sectional drawing of the ball joint in one Embodiment. FIG. 5 is a cross-sectional view taken along the line AA of the ball joint according to the embodiment.

Hereinafter, the present invention will be described based on the embodiments shown in the figure. As shown in FIGS. 1 to 3, the ball joint 1 in one embodiment is attached to the ball 3 provided at the end of the ball stud 2, the bracket B that rotatably wraps the ball 3, and the ball 3. It is configured to include pins 4 and 4 having an axis passing through the center of rotation of the sphere 3 and grooves 5 and 5 provided on the inner circumference of the bracket B facing the sphere 3 into which the pins 4 and 4 are inserted. There is.

Hereinafter, each part of the ball joint 1 will be described. The ball stud 2 is cylindrical and has a screw portion 2a on the outer periphery of the tip, and a ball 3 is provided at the base end. The ball stud 2 can be attached to a damper or the like (not shown) by using the screw portion 2a.

The sphere 3 is provided with a pair of pins 4 and 4 having an axis passing through the center of the sphere 3 on a virtual axis VA orthogonal to the axis BA of the ball stud 2 and passing through the center of the sphere 3. The axes of pins 4 and 4 coincide with the virtual axis VA, and pins 4 and 4 are orthogonal to the axis BA of the ball stud 2 and are virtual circles where the virtual plane passing through the center of the sphere 3 and the outer circumference of the sphere 3 intersect. It is provided on the sphere 3 with a 180 degree phase difference above. In FIG. 1, assuming that the left-right direction is the Z-axis direction, the vertical direction is the X-axis direction, and the direction penetrating the paper surface is the Y-axis direction, the axis BA of the ball stud 2 is an axis parallel to the Z-axis in FIG. ..

The pins 4 and 4 are provided with screw portions 4a on the outer periphery at the base end, and the screw portions 4a are screwed into the screw holes 3a and 3a provided in the sphere 3 and attached to the sphere 3. Further, the head of the pin 4 is provided with an insertion hole (not shown) so that a tool can be inserted into the insertion hole and a screw can be easily fastened to the ball 3. .. When mounting the pins 4 and 4 on the ball 3, a hole may be provided in the ball 3 and the pin 4 may be press-fitted or fitted into the hole for mounting. Further, since the pin 4 is provided in the bracket B and inserted into the groove 5 to prevent the pin 4 from falling off from the ball 3, it may be mounted in such a manner that it can be temporarily fixed to the ball 3.

The bracket B has a tubular housing 6 that encloses the ball 3 and allows the ball stud 2 to protrude from one end, a lid 7 that closes the other end of the housing 6, and the ball 3 that is inserted into the housing 6. It is provided with a cylindrical holder 8 to support.

The diameter of the housing 6 is smaller than that of the right end side in FIG. 1 where the left end side in FIG. 1 is the other end side, and a diameter reduction portion 6a on the one end side and a diameter expansion portion 6b on the other end side are provided. ing. The inner diameter of the reduced diameter portion 6a is larger than the outer diameter of the ball stud 2, but smaller than the diameter of the ball 3. A curved surface 6e that is in sliding contact with the outer periphery of the sphere 3 is formed between the inner peripheral surface 6c of the reduced diameter portion 6a and the inner peripheral surface 6d of the enlarged diameter portion 6b, which is the inner circumference of the housing 6. There is. The radius of curvature of the curved surface 6e is set so that it can be slidably contacted with the outer peripheral surface of the sphere 3. Further, grooves 5 and 5 along the axial direction of the ball stud 2 from the curved surface 6e to the inner peripheral surface 6d which is the inner circumference of the enlarged diameter portion 6b, which is the inner circumference of the housing 6, have a phase difference of 180 degrees in the circumferential direction. It is formed. The grooves 5 and 5 lead to the other end of the housing 6, and the width dimension of the grooves 5 and 5 allows the pin 4 to be inserted. Further, the grooves 5 and 5 are elongated grooves extending on both sides along the axis BA direction of the ball stud 2 with respect to a virtual plane orthogonal to the axis BA of the ball stud 2 and passing through the center of the sphere 3, and the length thereof. Is set longer than the diameter of the pin 4. The depth of the groove 5 is deeper than the protrusion length of the pin 4 from the sphere 3, so that the bottom of the groove 5 does not interfere with the pin 4 so as not to hinder the movement of the pin 4 in the groove 5. It is considered.

To insert the ball 3 into the housing 6, the pins 4 and 4 are aligned with the positions where they can be inserted into the corresponding grooves 5 and 5, respectively, and the ball stud 2 is the other end of the housing 6 on the right end side in FIG. Insert from. When the sphere 3 is inserted until it comes into contact with the curved surface 6e of the housing 6, the ball stud 2 protrudes outward from one end of the housing 6, and the sphere 3 is received by the curved surface 6e so that the sphere 3 can rotate smoothly. There is.

In this way, with the sphere 3 housed in the housing 6, a tubular holder 8 having a curved recess 8a for supporting the tip of the sphere 3 is inserted into the inner circumference, and the housing 6 is filled with a lubricant. After that, a lid 7 that closes the other end of the housing 6 is bolted to the housing 6. Then, the sphere 3 slides into contact with the curved surface 6e of the housing 6 and the curved recess 8a of the holder 8, and the sphere 3 is wrapped in the bracket B.

The width dimension of the grooves 5 and 5 allows the insertion of the pin 4, but the side wall of the groove 5 is in sliding contact with the side portion of the pin 4 to be inserted, and the pin 4 is the groove 5 and 5. It is designed so that it does not rattle in the width direction. Further, the left end in FIG. 1, which is the tip of the grooves 5 and 5, is extended toward the ball stud 2 side from the virtual plane that is orthogonal to the axis BA of the ball stud 2 and passes through the center of the sphere 3, and is the other end of the housing 6. The length of the grooves 5 and 5 is longer than the diameter of the pins 4 and 4. In FIG. 1, when the sphere 3 rotates clockwise around the Y axis, the pins 4 and 4 move in the groove 5, but the upper pin 4 abuts on the tip of the holder 8 or the lower pin 4 is grooved. When it comes into contact with the tip wall surface of 5, the movement of the pin 4 is restricted, and the ball 3 is prevented from further rotating. On the contrary, when the sphere 3 rotates counterclockwise around the Y axis, the pins 4 and 4 move in the groove 5, but the upper pin 4 abuts on the tip wall surface of the groove 5 or the lower pin 4 is a holder. When it comes into contact with the tip of 8, the movement of the pin 4 is restricted, and the ball 3 is prevented from further rotating. Therefore, the sphere 3 can rotate around the Y axis in FIG. 1 within the range in which the movement of the pins 4 and 4 is restricted, and the rotatable angle is the tip position of the groove 5 and the tip position of the holder 8. It is set.

On the other hand, since the pins 4 and 4 are allowed to rotate in the grooves 5 and 5, the sphere 3 is allowed to rotate around the X axis in FIG. However, since the grooves 5 and 5 restrain the movement of the pins 4 and 4 in the width direction, the sphere 3 is restrained from rotating around the Z axis in FIG. 2 and is prevented from rotating.

Therefore, in the ball joint 1 of this example, the precession movement is allowed, but the rotation of the ball stud 2 around the axis is not allowed, and the ball stud 2 can be used for the joint portion of the rotary inertial mass damper. Further, if the ball joint 1 is used as a joint portion, it is not necessary to provide the rotary inertial mass damper with a detent for the rod in the rotary inertial mass damper, so that the total length of the rotary inertial mass damper can be shortened.

Then, in the ball joint 1, the rotation of the ball stud 2 of the ball 3 around the axis is achieved by the pin 4 and the groove 5 provided in the bracket B. That is, since all the structures for preventing the rotation of the ball 3 are housed in the bracket B, a separate seal is not required because the bracket B adopts the structure for preventing the rotation of the ball 3. Further, since it is not necessary to provide a hole from the outside to the inside of the bracket B, it is advantageous in terms of rust prevention. Further, since it is not necessary to provide a hole for inserting the bolt from the outside to the inside of the bracket B, it is advantageous in terms of strength as compared with the conventional ball joint. Therefore, according to the ball joint 1 of the present invention, even if it is possible to prevent the ball stud 2 from rotating around the axis, a seal is not required, which is advantageous in terms of rust prevention and strength.

Further, the grooves 5 and 5 are long grooves along the axis BA direction of the ball stud 2, and the lengths of the grooves 5 and 5 are longer than the diameter of the pin 4 and the width is such that the width is in sliding contact with the side surface of the pin 4. It is set. In this way, the ball joint 1 regulates only the rotation of the ball stud 2 around the axis, but allows precession, so that a damper provided between two members whose relative movement directions are not regulated. It is suitable for the joint part of.

Further, in the ball joint 1 of this example, a tubular housing 6 in which the bracket B wraps the ball 3 and allows the ball stud 2 to protrude from one end, and a lid 7 that closes the other end of the housing 6. The groove 5 is connected to the other end of the housing 6. When the ball joint 1 is configured in this way, the pin 4 can be inserted into the groove 5 when the ball 3 is inserted into the housing 6 with the pins 4 and 4 attached to the ball 3, and the ball joint 1 is assembled. Becomes very easy.

In the ball joint 1 of this example, two pins 4 are provided on the ball 3, and each pin 4 is inserted into the grooves 5 and 5 provided on the inner circumference of the housing 6 to prevent the ball 3 from rotating. However, the number of pins 4 installed is arbitrary, and a configuration in which one pin 4 and one groove 5 are provided can also be adopted. Further, in this example, the pin 4 is provided on the virtual axis VA that is orthogonal to the axis BA of the ball stud 2 and passes through the center of the ball 3 with respect to the ball 3, but the pin 4 is not limited to this. It may be installed so as to have the same axis as the axis on the axis passing through the center. In this case, the rotation of the pin 4 of the sphere 3 around the axis is the rotation around the axis having an inclination with respect to the three axes of XYZ, but the detent function around the axis of the ball stud 2 of the sphere 3 is lost. Absent.

This concludes the description of embodiments of the present invention, but the scope of the present invention is not limited to the details themselves illustrated or described.

1 ... ball joint, 2 ... ball stud, 3 ... ball, 4 ... pin, 5 ... groove, 6 ... housing, 7 ... lid, B ... bracket

Claims (2)

The ball provided at the end of the ball stud and
A bracket that rotatably wraps the ball and
A pin attached to the sphere and having an axis passing through the center of rotation of the sphere,
It is provided with a groove on the inner circumference of the bracket, which is provided so as to face the sphere and into which the pin is inserted.
The bracket has a tubular housing that encloses the ball and allows the ball stud to protrude from one end, and a lid that closes the other end of the housing.
Said groove, said formed from the middle of the inside of the housing in a straight line along the axial direction of the ball stud over to the other end Rutotomoni, the other end opening is closed by the lid,
A ball joint characterized in that rotation of the ball stud around an axis is restricted with respect to the bracket by inserting the pin into the groove. The groove is a long groove along the axial direction of the ball stud, the length of the groove is longer than the diameter of the pin, and the width is set to a length that is in sliding contact with the side surface of the pin. The ball joint according to claim 1.

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