JP2008128266A - Cylindrical component assembling structure and cylindrical component manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the torsion of a rubber member due to the associative rotation of an inner cylinder during assembling a cylindrical component on a base without the need for labor. <P>SOLUTION: In this cylindrical component assembling structure, the cylindrical component 21 is assembled on the base 12, which has: an outer cylinder 22; the inner cylinder arranged inside the outer cylinder 22; and a cylindrical rubber member 24 arranged between the outer cylinder 22 and the inner cylinder 23 and bonded to the outer peripheral face of the inner cylinder 23. The cylindrical component 21 is assembled on the base 12 by relatively rotating a female screw member and a bolt 16 inserted into the inner cylinder 23 to thread each other and then pressing one end face 23a of the inner cylinder 23 against the surface of the base 12. Surface roughing is applied to at least one of a pressed-against face where one end face 23a of the inner cylinder 23 is pressed against the surface of the base 12 and one end face 23a of the inner cylinder 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure for assembling a cylindrical part and a method for manufacturing the cylindrical part.

As this kind of cylindrical parts, an outer cylinder, an inner cylinder disposed inside the outer cylinder, and a cylindrical shape disposed between the outer cylinder and the inner cylinder and adhered to the outer peripheral surface of the inner cylinder The structure provided with these rubber members is known. The cylindrical part is assembled to the base by rotating the female screw member and the bolt inserted into the inner cylinder relative to each other and screwing the one end surface of the inner cylinder against the surface of the base. It has been.
However, when the bolt and the female screw member are tightened as described above, the nut or the head of the bolt and the other end surface of the inner cylinder are in sliding contact with each other, so that rotational torque around the axis acts on the inner cylinder. There was a risk of co-rotation. In this case, the inner cylinder is rotated about the axis with respect to the outer cylinder and the rubber member, and the rubber member is twisted, so that the cylindrical part after being assembled to the base body does not exhibit the designed performance.
Therefore, as means for solving such a problem, for example, as shown in Patent Document 1 below, a portion of the bolt inserted into the inner cylinder that protrudes from the other end surface of the inner cylinder is inserted into the washer. Has been proposed in which a nut is clamped in a non-rotatable manner with a jig in a state where it is disposed on the other end surface and a nut is tightened into the protruding portion of the bolt.
JP-A-5-87172

  However, the conventional structure for assembling cylindrical parts requires a jig and a washer for clamping as described above, and there is a problem that this assembling takes time.

  The present invention has been made in consideration of such circumstances, and suppresses the twisting of the rubber member due to the rotation of the inner cylinder together without assembling the cylindrical part when the cylindrical part is assembled to the base. It is an object of the present invention to provide an assembling structure for a cylindrical part and a method for manufacturing the cylindrical part.

In order to solve the above problems and achieve such an object, an assembly structure of a cylindrical part of the present invention includes an outer cylinder, an inner cylinder disposed inside the outer cylinder, and these outer cylinders. And a cylindrical rubber member disposed between the inner cylinder and an inner cylinder and bonded to the outer peripheral surface of the inner cylinder. The shaped part is assembled to the base by relatively rotating a female screw member and a bolt inserted into the inner cylinder and screwing them together, and pressing one end surface of the inner cylinder against the surface of the base, At least one of a pressure contact surface on which the one end surface of the inner cylinder is pressed on the surface of the base and one end surface of the inner cylinder is roughened.
In the present invention, since at least one of the pressure-contact surface of the base and the one end surface of the inner cylinder is roughened, the female screw member and the bolt inserted into the inner cylinder are rotated relatively to each other. When screwed and tightened, the frictional force generated between the one end surface of the inner cylinder and the pressure contact surface can be increased. As a result, when the female screw member and the bolt are tightened as described above, the nut or the head of the bolt and the other end surface of the inner cylinder are in sliding contact with each other, so that rotational torque about the axis acts on the inner cylinder. Then, even if the inner cylinder tries to rotate around the axis with respect to the outer cylinder and the rubber member, it is possible to suppress the end surface of the inner cylinder from sliding on the pressure contact surface due to the frictional force. It becomes possible, and it can prevent that this inner cylinder is rotated with respect to an outer cylinder and a rubber member. Therefore, when the bolt and the female screw member are tightened, the inner cylinder rotates together and the rubber member is twisted to prevent the cylindrical part after being assembled to the base from failing to exhibit the designed performance. it can.
In addition, since no jig or washer is required unlike the conventional cylindrical part assembly structure, it is possible to prevent troublesome assembly.

  Here, an intermediate cylinder is provided between the rubber member and the outer cylinder, and the outer peripheral surface of the rubber member is bonded to the inner peripheral surface of the intermediate cylinder, and the outer peripheral surface is the inner peripheral surface of the outer cylinder. May be fitted.

Further, the pressure contact surface may be formed of an Al-based material.
In this case, in order to reduce the weight or the cost of the base, even if the portion having the pressure contact surface of the base is formed of an Al-based material, the pressure contact surface and the one end surface as described above are used. Since at least one surface is roughened, it is possible to prevent the rubber member from being twisted by the inner cylinder rotating together. For example, when the inner cylinder and the head of the nut or the bolt described above are formed of an Fe-based material, the frictional force generated between the Fe-based material and the Al-based material is generally between the Fe-based materials. When the internal thread member and the bolt inserted into the inner cylinder are relatively rotated and screwed together and tightened, one end surface of the inner cylinder is placed on the pressure contact surface. Although the inner cylinder is slid and is easy to rotate with respect to the rubber member and the outer cylinder, since the rough surface processing is performed as described above, such rotation can be prevented. .

Further, the base body is a power unit including an engine, and the cylindrical component is provided with a rod projecting radially outward from the outer peripheral surface of the outer cylinder, and a tip portion of the rod The side may be connected to the vehicle body.
In this case, it becomes possible to assemble the cylindrical part to the power unit without twisting and deforming the rubber member. In the assembly structure of the cylindrical part and the power unit, the performance of the cylindrical part is exhibited as designed. be able to.

The cylindrical part manufacturing method of the present invention includes an outer cylinder, an inner cylinder disposed inside the outer cylinder, an intermediate cylinder fitted to the inner peripheral surface of the outer cylinder, and an inner circumference of the intermediate cylinder. A cylindrical part manufacturing method comprising: a cylindrical rubber member that is bonded to a surface and an outer peripheral surface of an inner cylinder to connect the intermediate cylinder and the inner cylinder; And an insert molding step in which a rubber-like elastic part is injection-molded between the intermediate cylinder and the inner cylinder in a state where the inner cylinder is inserted into the cavity, and the rubber member is vulcanized by vulcanizing the rubber-like elastic part. A vulcanization step to be formed, and a fitting step in which the vulcanized molded product obtained in the vulcanization step is fitted into the outer cylinder, and the fitting step includes the vulcanization step. At the same time that the molded product is pushed in and fitted into the outer cylinder, the one end surface of the inner cylinder is pressed in the axial direction thereof, so that the uneven portion Characterized in that it recessed.
In the present invention, the cylindrical part having the above-described effects can be easily and reliably formed. In addition, in the fitting step, the vulcanized molded product is pushed into the outer cylinder to be fitted, and at the same time, one end surface of the inner cylinder is pressed in the axial direction so that the concavo-convex part is provided. The manufacturing time of the cylindrical part can be maintained at the current level.

  According to this invention, when assembling the cylindrical part to the base body, it is possible to prevent the rubber member from being twisted by rotating the inner cylinder together without taking time and effort.

Hereinafter, an embodiment of an assembling structure for cylindrical parts according to the present invention will be described with reference to FIGS.
First, the torque rod 10 to which this cylindrical part is applied will be described. As shown in FIGS. 1 to 3, the torque rod 10 includes a rod 11 and first and second cylindrical parts 21 and 31 respectively connected to both ends of the rod 11. The first cylindrical part 21 has a larger diameter than the second cylindrical part 31.

  The first and second cylindrical parts 21 and 31 are respectively an outer cylinder 22 and 32, an inner cylinder 23 and 33 disposed inside the outer cylinder 22 and 32, and the outer cylinder 22 and 32 and the inner cylinder. And cylindrical rubber members 24 and 34 which are disposed between the inner cylinders 23 and 33 and are bonded to the outer peripheral surfaces of the inner cylinders 23 and 33. In the present embodiment, the first and second cylindrical parts 21 and 31 are further provided with intermediate cylinders 25 and 35 between the outer peripheral surfaces of the rubber members 24 and 34 and the inner peripheral surfaces of the outer cylinders 22 and 32, respectively. In the intermediate cylinders 25 and 35, the outer peripheral surfaces of the rubber members 24 and 34 are bonded to the inner peripheral surfaces thereof, and the outer peripheral surfaces are fitted to the inner peripheral surfaces of the outer cylinders 22 and 32.

 The outer cylinders 22 and 32, the inner cylinders 23 and 33, and the intermediate cylinders 25 and 35 are each formed of an Fe-based material, and are arranged coaxially with the central axes O1 and O2 as common axes. Further, on both end surfaces of the rubber member 24 provided in the first tubular part 21 in the direction of the central axis O1, holes 24a are provided at positions opposite to each other with the central axis O1 sandwiched in the radial direction. Is formed. Further, both end portions of the inner cylinders 23 and 33 in the central axis O1 and O2 directions protrude from both end surfaces of the outer cylinders 22 and 32, the rubber members 24 and 34, and the intermediate cylinders 25 and 35, respectively.

  Here, in the illustrated example, the central axis O1 of the first cylindrical component 21 is parallel to the virtual axis obtained by rotating the central axis O2 of the second cylindrical component 31 by 90 ° around the central axis of the rod 11. It extends. That is, as shown in FIG. 1, for example, when the torque rod 10 is arranged so that the central axis O1 extends in the horizontal direction, the central axis O2 extends in the vertical direction. The inner peripheral surface of the inner cylinder 33 of the second cylindrical component 31 has a long hole shape that is long in the central axis direction of the rod 11.

On the other hand, the base 12 to which the torque rod 10 is assembled is a power unit including an engine in the present embodiment. As shown in FIG. 1, the base 12 is assembled with the first cylindrical component 21 and the second cylindrical component 31 is assembled with the vehicle body. The substrate 12 is attached to the vehicle body via the torque rod 10. Are elastically connected. In addition, the base 12 includes a bracket 12a made of an Al-based material.
And the 1st cylindrical component 21 is the state which made the one end surface 23a of the inner cylinder 23 contact | abut to the surface of the bracket 12a, and the hexagon bolt 16 inserted in this inner cylinder 23 from the other end surface 23b side is attached to the bracket 12a. The one end surface 23a of the inner cylinder 23 is pressed against the surface of the bracket 12a by being screwed into a female screw portion formed on the surface and screwed together, and is assembled to the base 12.

  In the present embodiment, the surface of the bracket 12a is subjected to roughening on at least one of the pressure contact surface to which the one end surface 23a of the inner cylinder 23 is pressed and the one end surface 23a of the inner cylinder 23 of the first cylindrical component 21. Has been. For example, at least one of the one end surface 23a of the inner cylinder 23 of the first cylindrical component 21 and the pressure contact surface of the bracket 12a is roughened by an appropriate means such as sandblasting, knurling, or a method described later. Yes.

  In the present embodiment, as shown in FIGS. 4 and 5, the rough surface processing is performed by providing a large number of recessed portions 13 on one end surface 23 a of the inner cylinder 23 of the first cylindrical component 21. Has been. In the example shown in the drawing, the recessed portion 13 has a square shape in plan view of the one end surface 23a, and the opening area gradually decreases from the one end surface 23a toward the bottom surface 13a of the square in plan view. That is, the recessed portion 13 is defined by a bottom surface 13a and four inclined surfaces 13b rising from the four sides that define the bottom surface 13a toward the one end surface 23a.

  A plurality of the recessed portions 13 are formed on the one end surface 23a with a constant interval in one direction, and a plurality of the recessed portions 13 are also formed in the other direction with an interval equivalent to the interval in the one direction. Further, the ratio of the total opening area of the plurality of recesses 13 to the flat area of the one end face 23a is larger than 50%. The angle formed by the central axis O1 and the inclined surface 13b is about 45 °. On the other hand, the other surface 23b of the inner cylinder 23 of the first cylindrical component 21 is not subjected to the rough surface processing as described above, and is a smooth surface.

Next, the manufacturing method of the 1st cylindrical component 21 among the torque rods 10 comprised as mentioned above is demonstrated.
First, in a state where the intermediate cylinder 25 and the inner cylinder 23 are inserted into a cavity (not shown), a rubber-like elastic portion is injection-molded between the intermediate cylinder 25 and the inner cylinder 23 (insert molding process). In addition, when inserting the intermediate | middle cylinder 25 and the inner cylinder 23 in the said cavity, the inner cylinder 23 is arrange | positioned so that it may mutually arrange | position coaxially inside the intermediate cylinder 25. FIG. Then, the rubber-like elastic portion is vulcanized to form a cylindrical rubber member 24 (vulcanization step). At this time, the rubber member 24 adheres to the inner peripheral surface of the intermediate tube 25 and the outer peripheral surface of the inner tube 23. Thereafter, a vulcanized molded product including the intermediate cylinder 25, the inner cylinder 23, and the rubber member 24 is pushed into the inner side of the outer cylinder 22 to fit the outer peripheral surface of the intermediate cylinder 25 and the inner peripheral surface of the outer cylinder 22 ( Mating process). Thus, when the vulcanized molded product is pushed into the outer cylinder 22 and fitted, at the same time, the one end surface 23a of the inner cylinder 23 is pressed in the direction of the central axis O1, and the recessed portion 13 (uneven portion) is recessed. Set up.

  As described above, according to the assembly structure of the cylindrical part according to the present embodiment, the end surface 23a of the inner cylinder 23 is roughened in the first cylindrical part 21, and thus the surface of the bracket 12a. When the female thread portion formed on the inner cylinder 23 and the hexagonal bolt 16 inserted into the inner cylinder 23 are relatively rotated and screwed together and tightened, the one end surface 23a of the inner cylinder 23 and the pressure contact surface are interposed. It is possible to increase the generated frictional force. As a result, when the female screw portion and the hexagon bolt 16 are tightened as described above, the head of the hexagon bolt 16 and the other end surface 23b of the inner cylinder 23 are in sliding contact with each other, so that the inner axis 23 is in contact with the inner cylinder 23. Even when the inner cylinder 23 tries to rotate around the central axis O1 with respect to the outer cylinder 22 and the rubber member 24 due to the rotation torque around, the one end surface 23a of the inner cylinder 23 is caused to be covered by the frictional force. It is possible to suppress sliding on the pressure contact surface, and it is possible to prevent the inner cylinder 23 from being rotated with respect to the outer cylinder 22 and the rubber member 24.

Therefore, when the hexagon bolt 16 and the female thread portion are tightened, the inner cylinder 23 rotates together, the rubber member 24 is twisted, and the first cylindrical component 21 after being assembled to the base body 12 performs as designed. It can be prevented that it does not work.
In addition, since no jig or washer is required unlike the conventional cylindrical part assembly structure, it is possible to prevent troublesome assembly.

  In the present embodiment, since the bracket 12a having the pressure contact surface is formed of an Al-based material, it is possible to reduce the weight or cost of the entire base 12. Even when the bracket 12a is formed of an Al-based material in this way, the end surface 23a is roughened as described above, so that the inner cylinder 23 rotates together and the rubber member 24 is twisted. Can be prevented.

  Further, in the present embodiment, the base 12 is a power unit including an engine, and the first cylindrical component 21 is provided on the torque rod 10, so that the rubber member 24 of the first cylindrical component 21 is not twisted and deformed. Since the first cylindrical component 21 can be assembled to the power unit, the performance of the first cylindrical component 21 is as designed in the assembly structure of the torque rod 10 and the power unit as shown in FIG. It can be demonstrated.

  In addition, in the fitting step, the first tubular part 21 is configured to push the vulcanized molded product into the outer cylinder 22 and to fit the end part 23a of the inner cylinder 23 in the direction of the central axis O1. Since the dent 13 is provided by pressing, the first cylindrical part 21 having the above-described effects can be easily and reliably formed. In addition, in the fitting step, the vulcanized molded product is pushed into the outer cylinder 22 to be fitted, and at the same time, the one end surface 23a of the inner cylinder 23 is pressed in the direction of the central axis O1 so that the recess 13 is formed. Since it is recessed, the manufacturing time of this cylindrical component 21 can be maintained at the current level.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the entire bracket 12a is formed of an Al-based material, but at least only a pressure contact surface to which the one end surface 23a of the inner cylinder 23 of the first cylindrical component 21 is pressed is formed of an Al-based material. May be. Moreover, it is applicable also to the base | substrate 12 which does not have this bracket 12a.

Furthermore, in the said embodiment, although the torque rod 10 provided with the 1st, 2nd cylindrical components 21 and 31 and the rod 11 was shown, it does not have the 2nd cylindrical components 31 and the rod 11, but the 1st cylinder. A configuration having only the shaped part 21 may be assembled to the base 12.
Moreover, in the said embodiment, although the recessed part 13 was formed in the one end surface 23a of the inner cylinder 23 of the 1st cylindrical component 21 at the time of the said fitting process, it replaces with this and is different from this fitting process, for example. In this step, the one end face 23a may be subjected to roughening such as knurling or sandblasting.

  Further, the recessed portion 13 may be, for example, a triangular shape or a circular shape in plan view instead of the embodiment, and a plurality of recessed portions formed on the one end surface 23a with a certain interval in one direction. When a plurality of rows of the portions 13 are arranged at certain intervals in the other direction, the rows of the recessed portions 13 that are adjacent in the other direction are arranged so as to be shifted in the one direction, thereby forming the recessed portions 13. May be arranged in a staggered pattern. Furthermore, instead of the recessed portion 13, a convex portion or an uneven portion may be formed.

Furthermore, in the said embodiment, although the rough surface process was given to the one end surface 23a in the inner cylinder 23 of the 1st cylindrical component 21, you may give to the said to-be-contacted surface, or the above-mentioned one end surface 23a and to-be-contacted contact Both surfaces may be roughened.
Moreover, in the said embodiment, in order to assemble the torque rod 10 to the bracket 12a, the hexagon bolt 16 is inserted in the inner cylinder 23 of the 1st cylindrical component 21, and this bolt 16 is formed in the said to-be-contacted surface of the bracket 12a. In place of this, instead of this, for example, a bolt is protruded from the pressure contact surface of the bracket 12a, and this bolt is inserted from the one end surface 23a side of the inner cylinder 23. A nut may be screwed into a portion protruding from the other end surface 23 b of the inner cylinder 23.

  Furthermore, in the said embodiment, although the intermediate | middle cylinders 25 and 35 were provided in the 1st, 2nd cylindrical components 21 and 31, it replaces with this, for example, without providing the intermediate | middle cylinders 25 and 35, the rubber member 24, You may make it adhere | attach the outer peripheral surface of 34 to the inner peripheral surface of the outer cylinders 22 and 32. FIG.

  When assembling the cylindrical part to the base, it is possible to prevent the rubber member from twisting around the inner cylinder without twisting.

It is a perspective view of the assembly structure of a cylindrical part shown as one embodiment concerning the present invention. It is a top view of the torque rod shown in FIG. FIG. 3 is a cross-sectional view of the torque rod shown in FIG. FIG. 4 is a partially enlarged plan view of one end surface of the inner cylinder of the first cylindrical component in the torque rod shown in FIGS. 1 to 3. 5 is a cross-sectional view of the inner cylinder shown in FIG.

Explanation of symbols

11 Rod 12 Base 13 Recessed portion (Uneven portion)
16 Hexagon bolt (bolt)
21 1st cylindrical part (tubular part)
22 Outer cylinder 23 Inner cylinder 23a One end surface of the inner cylinder 24 Rubber member 25 Intermediate cylinder 31 Second cylindrical component (rod tip side)

Claims (5)

A cylinder comprising: an outer cylinder; an inner cylinder disposed inside the outer cylinder; and a cylindrical rubber member disposed between the outer cylinder and the inner cylinder and bonded to the outer peripheral surface of the inner cylinder. A cylindrical part assembly structure for assembling a cylindrical part to a base body,
The cylindrical part is assembled to the base body by relatively rotating a female screw member and a bolt inserted into the inner cylinder so as to be screwed together, and pressing one end surface of the inner cylinder against the surface of the base body. ,
Assembly of a cylindrical part, characterized in that at least one of a pressure contact surface where one end surface of the inner cylinder is in pressure contact with a surface of the base body and one end surface of the inner cylinder is subjected to roughening. Construction. The assembly structure of the cylindrical part according to claim 1,
An intermediate cylinder is provided between the rubber member and the outer cylinder. In the intermediate cylinder, the outer peripheral surface of the rubber member is bonded to the inner peripheral surface thereof, and the outer peripheral surface is fitted to the inner peripheral surface of the outer cylinder. The assembly structure of the cylindrical part characterized by having performed. The assembly structure of the cylindrical part according to claim 1 or 2,
An assembly structure of a cylindrical part, wherein the pressure contact surface is made of an Al-based material. The assembly structure of the cylindrical part according to any one of claims 1 to 3,
The base body is a power unit including an engine, and the cylindrical part is provided with a rod projecting radially outward from the outer peripheral surface of the outer cylinder, and the tip end side of the rod is a vehicle body. An assembly structure of a cylindrical part, characterized in that it is connected to a cylinder. The outer cylinder, the inner cylinder arranged inside the outer cylinder, the intermediate cylinder fitted to the inner peripheral surface of the outer cylinder, and the inner cylinder and the outer peripheral surface of the inner cylinder A cylindrical rubber member that connects an intermediate cylinder and an inner cylinder, and a cylindrical part manufacturing method for manufacturing a cylindrical part comprising:
With the intermediate cylinder and the inner cylinder inserted into the cavity, an insert molding step for injection molding a rubber-like elastic portion between the intermediate cylinder and the inner cylinder;
A vulcanization step of vulcanizing the rubber-like elastic portion to form the rubber member;
A vulcanization molded product obtained in this vulcanization step, and a fitting step of fitting the vulcanized molded product into the inside of the outer cylinder,
In this fitting step, the vulcanized molded product is pushed into the outer cylinder to be fitted, and at the same time, one end surface of the inner cylinder is pressed in the axial direction so that the uneven portion is recessed. A method for manufacturing a cylindrical part.

Images