JP2016036856A - Bolt fastening method and bolt fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt fastening method and a bolt fastening device which are suitable for shortening of a cycle time.SOLUTION: A bracket 1 is so located on a work table 11B that facing members 3 are positioned in a vertical direction, vertical positioning pins 21, 25 are respectively engaged from a vertical direction with bolt insertion holes 4 of the facing members 3 thereby positioning the bracket 1, and a boss member 2 is located between the facing members 3. Then, the boss member 2 is energized to a lower side opposite member 3B side thereby pressing the lower side opposite member 3B onto the work table 11B and positioning the bracket 1, and consequently, a lower side positioning pin 25 is withdrawn from a bolt insertion hole 4B of the lower side opposite member 3B. Next, a shank 7A of a bolt 7 is inserted into the bolt insertion hole 4B of the lower side opposite member 3B, and is sequentially inserted into a bolt insertion hole 6 of the boss member 2 and a bolt insertion hole 4A of an upper side opposite member 3A.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a bolt fastening method and a bolt fastening device in which a cylindrical member is disposed between opposing members of a U-shaped bracket, and bolts are passed through both bolt insertion holes and fastened.

  Conventionally, there has been proposed a bolt fastening device in which a cylindrical member is disposed between opposing members of a U-shaped bracket, and bolts are passed through bolt insertion holes provided in both of them to be fastened (Patent Documents 1 and 2). reference). First, guide pins are inserted into the bolt insertion holes provided in both the bracket and the cylindrical member from one side to align the bolt insertion holes, and then the guide pins are removed from the bolt insertion holes, Insert the bolt from the other side. Then, a nut is screwed into the bolt tip protruding from one of the bolt insertion holes, and both are fastened.

JP 61-76233 A JP 61-76234 A

  However, in the above-described conventional example, the guide pin is inserted into the bolt insertion hole of the bracket and the cylindrical member in advance so that the axial centers of the bolt insertion holes of the bracket and the cylindrical member are aligned. For this reason, there is a problem that the cycle time becomes long.

  Then, this invention was made | formed in view of the said problem, and it aims at providing the bolt fastening method and bolt fastening apparatus suitable for shortening of cycle time.

  The present invention provides a bracket by disposing a boss member having a bolt insertion hole between the opposing members of the bracket having an opposing member with a bolt insertion hole, respectively, and inserting the bolt into both bolt insertion holes. A bolt fastening method for fastening a boss member. Specifically, the bracket is arranged on the work table so that the opposing member is positioned in the vertical direction, and the upper positioning pin and the lower positioning pin are engaged with the bolt insertion holes of the opposing member from the vertical direction, respectively. The bracket is positioned, and the boss member is disposed between the opposing members of the bracket. Then, the boss member is biased toward the lower facing member side of the bracket, the lower facing member is pressed against the work table to position the bracket, and the lower positioning pin is detached from the bolt insertion hole of the lower facing member. Let Next, the shaft portion of the bolt was inserted into the bolt insertion hole of the lower facing member, and sequentially inserted into the bolt insertion hole of the boss member and the bolt insertion hole of the upper facing member.

  Therefore, in the present invention, the boss member is biased toward the lower facing member side of the bracket, the lower facing member is pressed against the work table to position the bracket, and the lower positioning pin is connected to the bolt of the lower facing member. It is made to detach from the insertion hole. Thereby, even if the lower positioning pin is detached, it is possible to ensure the positional accuracy of the axis of the bolt insertion hole of the lower opposing member of the bracket in the positioning state set by the lower positioning pin. In addition, by removing the lower positioning pin, the bolt insertion hole provided in the lower facing member of the bracket can be opened, so that the bolt shaft portion can be inserted. For this reason, the shaft portion of the bolt can be continuously inserted into the bolt insertion hole of the lower facing member, and sequentially inserted into the bolt insertion hole of the boss member and the bolt insertion hole of the upper facing member, thereby shortening the cycle time. And a bolt fastening method suitable for the above.

It is sectional drawing which shows an example of the workpiece | work which applies the bolt fastening method of this invention. It is a schematic front view of a bolt fastening device showing one embodiment of the present invention. It is a schematic side view of a bolt fastening device. It is an enlarged front view of the principal part of a bolt fastening device. It is an enlarged side view of the principal part of a bolt fastening apparatus. It is explanatory drawing which shows a spherical surface shape (A) and a taper shape (B) which are examples of the front-end | tip shape of an up-and-down positioning pin. It is a flowchart which shows the procedure of a bolt fastening method. It is assembly explanatory drawing which shows procedure S1-S3. It is assembly explanatory drawing which shows procedure S4. It is assembly explanatory drawing which shows procedure S5. It is explanatory drawing explaining the engagement state of the upper side positioning pin and bolt insertion hole of a bracket in procedure S5. It is assembly explanatory drawing which shows procedure S6-S9. . It is assembly explanatory drawing which shows procedure S10. It is explanatory drawing explaining the engagement state of the upper side positioning pin and bolt insertion hole of a bracket in procedure S10. It is assembly explanatory drawing which shows procedure S11. It is assembly explanatory drawing which shows procedure S12.

  Hereinafter, a bolt fastening method and a bolt fastening device according to an embodiment of the present invention will be described.

  FIG. 1 shows a cross-sectional view of a work to which a bolt fastening method and a bolt fastening device of the present invention are applied. The workpiece W shown in FIG. 1 is used as, for example, a suspension link of a vehicle, an attachment portion of an arm to the vehicle body side and an axle side, and an attachment portion of a suspension member to the vehicle body. For this reason, the workpiece W is provided with a vibration-proof rubber 5A between the bracket 1 and the outer cylinder 5B and the inner cylinder 5C. A boss member 2 disposed between the opposing members 3 of the bracket 1. Further, the workpiece W passes through the bolt insertion holes 4A and 4B provided in the opposing member 3 of the bracket 1 and the bolt insertion hole 6 of the inner cylinder 5C in the boss member 2 to fix the boss member 2 to the bracket 1. A bolt 7 and a nut 8 screwed into the bolt 7 are provided.

  The opposing members 3 of the bracket 1 are paired in a relative manner. In the following, when the upper and lower opposing members are collectively referred to as “opposing member 3”, the upper opposing member in FIG. The lower facing member in the figure is referred to as “lower facing member 3B”. In addition, the bolt insertion holes 4 are also provided in the pair of opposing members 3 respectively. In the following, when the upper and lower bolt insertion holes are collectively referred to as “bolt insertion holes 4”, they are provided in the upper opposing member 3A. The bolt insertion hole is referred to as “upper bolt insertion hole 4A”, and the bolt insertion hole provided in the lower facing member 3B is referred to as “lower bolt insertion hole 4B”.

  For example, when the work W is configured as an end of a suspension link or arm, the boss member 2 is connected to the suspension link or arm, and the bracket 1 is connected to the vehicle body side suspension member or the wheel side axle. Connected. Contrary to the above, the bracket 1 may be connected to a suspension link or arm, and the boss member 2 may be connected to a vehicle body side suspension member or a wheel side axle. Thus, the suspension link or arm and the vehicle body side suspension member or the wheel side axle are elastically connected via the vibration isolating rubber 5A of the boss member 2.

  Further, when the work W is configured as a suspension member mounting portion to the vehicle body, the boss member 2 is connected to the vehicle body or the suspension member, and the bracket 1 is connected to the suspension member or the vehicle body. Thereby, the vehicle body side suspension member and the vehicle body are elastically connected via the vibration isolating rubber 5A of the boss member 2.

  In assembling such a workpiece W, first, the bracket 1 is disposed at the assembly position, and then the boss member 2 is disposed between the opposing members 3 of the bracket 1. Next, the axial centers of the bolt insertion hole 6 of the boss member 2 and the bolt insertion hole 4 of the opposing member 3 are aligned, and then the bolt 7 is inserted from the bolt insertion hole 4 of one opposing member 3. By inserting the bolt shaft portion 7A into the bolt insertion hole 4, the axial centers of the bolt insertion hole 6 of the boss member 2 and the bolt insertion hole 4 of the opposing member 3 are aligned. The tip of the bolt shaft portion 7A is formed as a tapered shape 7B in order to facilitate alignment of the axial centers of the bolt insertion hole 4 of the opposing member 3 and the bolt insertion hole 6 of the boss member 2. And finally, the assembly state shown in FIG. 1 can be obtained by screwing the nut 8 into the bolt shaft portion 7B protruding from the bolt insertion hole 4 of the other opposing member 3.

  2 to 5 are enlarged views of a part of a bolt fastening device to which the present invention is applied. 2 and 3, the bolt fastening device 10 is fixed on a frame 11A erected on the jig base 11, and supports a work table 11B for supporting the bracket 1 constituting the work W from below, and on the work table 11B. And a handling device for putting the bracket 1 into a predetermined position. Although the bracket 1 handling device is not shown, it is constituted by a manipulator such as a general robot hand. The bolt fastening device 10 includes a bracket positioning device 20 disposed on the jig base 11, a handling device 40 that holds the boss member 2 constituting the workpiece W in the bracket 1, and the bracket 1 and the boss member 2. A bolt insertion device 30 for inserting the bolts 7 through the bolt insertion holes 4 and 6. Although only the hand that holds the boss member 2 is illustrated, the handling device 40 is configured by a manipulator such as a general robot hand.

  The bracket 1 is placed on the work table 11B by the handling device so that the axial center of the bolt insertion hole 4 provided in the opposing member 3 is in the vertical direction by positioning the opposing member 3 up and down. The bracket positioning device 20 positions and supports the bracket 1 on the work table 11B with the bolt insertion hole 4 provided in the opposing member 3 positioned above and below it as a reference (positioning shaft). The bolt insertion device 30 inserts the bolt 7 through the bolt insertion hole 4 of the opposing member 3 on the bracket 1 side and the bolt insertion hole 6 of the boss member 2.

  The bracket positioning device 20 includes an upper positioning pin 21 fitted from above into the upper bolt insertion hole 4A of the upper facing member 3A in the bracket 1 placed on the work table 11B, and the lower bolt insertion of the lower facing member 3B. And a lower positioning pin 25 fitted into the hole 4B from below. The upper positioning pin 21 is fitted into the upper bolt insertion hole 4A from above to position the upper opposing member 3A of the bracket 1, and the lower positioning pin 25 is fitted into the lower bolt insertion hole 4B from below. The lower facing member 3B of the bracket 1 is positioned.

  The tips of the vertical positioning pins 21 and 25 are formed into spherical shapes 21A and 25A or tapered shapes 21B and 25B as shown in FIG. For this reason, even if the dimension and shape of the bolt insertion hole 4 of the opposing member 3 engaged for positioning are changed, the bolt insertion hole 4 is within a range in which the engagement with the positioning pins 21 and 25 is possible. The bracket 1 can be positioned via That is, since the positioning pins 21 and 25 have spherical shapes 21A and 25A or tapered shapes 21B and 25B at their tips, they do not need to be changed for each shape and size of the bolt insertion hole 4 of the bracket 1. Therefore, the positioning pins 21 and 25 are versatile and can reduce the cost.

  The upper positioning pin 21 is moved from the standby position to the intermediate position on the positioning axis C by the horizontal axis cylinder 22 and descends from the intermediate position along the positioning axis C by the vertical axis cylinder 23 to move the upper bolt insertion hole 4A of the bracket 1. It is moved to a positioning position that engages with. 4 shows the upper positioning pin 21 in a state of being engaged with the upper bolt insertion hole 4A of the bracket 1 at the positioning position on the positioning axis C. FIG. The upper positioning pin 21 is raised from the positioning position engaged with the upper bolt insertion hole 4A of the bracket 1 to the intermediate position along the positioning axis C by the vertical cylinder 23, and then the positioning axis C by the horizontal cylinder 22. Returned from the upper middle position to the standby position.

  The upper positioning pin 21 is attached to the output portion of the vertical cylinder 23 via a vertical floating mechanism 24. The floating mechanism 24 includes a slider 24A that supports the upper positioning pin 21 so as to be movable in the vertical direction with respect to the output portion of the vertical cylinder 23, and a spring 24B that biases the upper positioning pin 21 downward in the movable range of the slider 24A. And comprising. For this reason, the upper positioning pin 21 is positioned at the lower limit position of the movable range of the slider 24A by the floating mechanism 24 in a state where no external force is applied, and when an external force is applied from below, the spring 24B contracts according to the external force. And is configured to move to a balanced position.

  The lower positioning pin 25 is moved from the standby position to the intermediate position on the positioning axis C by the horizontal axis cylinder 26. Further, the lower positioning pin 25 is lifted from the intermediate position along the positioning axis C by the vertical cylinder 27, passes through the through hole 11C provided in the work table 11B, and enters the lower bolt insertion hole 4B of the bracket 1. It is moved to the engaging positioning position. 4 and 5 show the lower positioning pin 25 in a state of being engaged with the lower bolt insertion hole 4B of the bracket 1 at the positioning position on the positioning shaft C. FIG. Further, the lower positioning pin 25 is lowered from the positioning position engaged with the lower bolt insertion hole 4B of the bracket 1 to the intermediate position along the positioning axis C by the vertical axis cylinder 27, and then, the positioning axis is set by the horizontal axis cylinder 26. The intermediate position on C is returned to the standby position.

  The lower positioning pin 25 is attached to the output portion of the vertical cylinder 27 through a vertical floating mechanism 28. The floating mechanism 28 urges the upper positioning pin 21 upward and the cylindrical member 28A that supports the upper positioning pin 21 so as to be movable within a predetermined movable range in the vertical direction with respect to the output portion of the vertical cylinder 27. And a spring 28B. Therefore, the upper positioning pin 21 is positioned at the upper limit position of the movable range by the floating mechanism 28 in a state where no external force is applied, and when the external force is applied from above, the spring 28B is contracted in accordance with the external force and balanced. It is configured to move to a position.

  The handling device 40 that grips the boss member 2 shows only a hand that grips the boss member 2. The handling device 40 grips the boss member 2 from the supply device and arranges it between the opposing members 3 of the bracket 1 positioned by the bracket positioning device 20, and the bolt insertion holes 4 of the opposing member 3 and the bolts of the boss member 2. It operates so as to hold the insertion hole 6 in alignment. In addition, the handling device 40 lowers the boss member 2 disposed and positioned on the bracket 1 in the axial direction thereof, thereby causing the lower facing member 3B positioned by the lower positioning pin 25 to work as described later. It operates to press and hold the table 11B. Further, the handling device 40 lifts the boss member 2 disposed and positioned on the bracket 1 in the axial direction thereof, thereby releasing the pressing of the bracket 1 against the work table 11B as will be described later. The insertion hole 4A and the upper positioning pin 21 are operated so as to be aligned.

  As shown in FIG. 3, the bolt insertion device 30 includes a socket 31 that holds the head of the inverted bolt 7 from below. Although not shown, the bolt insertion device 30 includes a horizontal axis cylinder and a vertical axis cylinder similar to the horizontal axis cylinder 26 and the vertical axis cylinder 27 of the lower positioning pin 25. Then, the bolt insertion device 30 moves the socket 31 holding the bolt 7 from the standby position to the intermediate position on the positioning axis C by the horizontal axis cylinder, and lifts the socket 31 from the intermediate position along the positioning axis C by the vertical axis cylinder. The shaft portion of the bolt 7 is projected through the through hole 11C provided in the work table 11B. Then, the shaft portion of the bolt 7 is sequentially engaged with the lower bolt insertion hole 4B of the bracket 1, the bolt insertion hole 6 of the boss member 2, and the upper bolt insertion hole 4A of the bracket 1, and the bracket 1 is The tip of the bolt 7 is moved so as to protrude from the bolt insertion hole 4A. In this state, the nut 1 is screwed into the front end of the bolt shaft portion 7A, whereby the bracket 1 and the boss member 2 are bolted. After the bolt is tightened, the socket 31 is returned from the limit position on the positioning axis C to the intermediate position by the vertical axis cylinder, and then returned from the intermediate position on the positioning axis C to the standby position by the horizontal axis cylinder.

  A bolt fastening method using the bolt fastening device 10 having the above configuration will be described with reference to FIGS. FIG. 7 shows the procedure of the bolt fastening method, and FIGS. 8 to 16 show the operation states of the workpiece W, the bracket positioning device 20, the handling device 40, and the bolt insertion device 30 in a typical procedure of the bolt fastening method. Is. In the standby state of the bolt fastening device 10, the upper and lower positioning pins 21 and 25, the handling device 40, and the bolt insertion device 30 of the bracket positioning device 20 are all returned to the standby position.

  First, as shown in FIG. 8, the opposing member 3 is positioned vertically on the work table 11 </ b> B by a handling device (not shown) so that the axis of the bolt insertion hole 4 provided in the opposing member 3 is in the vertical direction. The bracket 1 is placed (procedure S1 in FIG. 7).

  Next, the upper positioning pin 21 of the bracket positioning device 20 is moved from the standby position to the intermediate position on the positioning axis C by the horizontal axis cylinder 22, and then lowered from the intermediate position along the positioning axis C by the vertical axis cylinder 23. Move toward the positioning position. The upper positioning pin 21 engages with the upper bolt insertion hole 4 </ b> A of the bracket 1. Accordingly, the vertical cylinder 23 supports the bracket 1 in a floating state in a state where the spring 24B of the floating mechanism 24 is contracted (step S2 in FIG. 7). Thereby, the upper positioning pin 21 positions the upper facing member 3 </ b> A of the bracket 1.

  Next, the lower positioning pin 25 of the bracket positioning device 20 is moved from the standby position to the intermediate position on the positioning axis C by the horizontal axis cylinder 26, and then raised from the intermediate position along the positioning axis C by the vertical axis cylinder 27. To move toward the positioning position. As a result, the lower positioning pin 25 is inserted into the through hole 11C of the work table 11B, and further rises to engage with the lower bolt insertion hole 4B of the bracket 1. Further, the vertical cylinder 27 supports the bracket 1 in a floating state with the spring 28B of the floating mechanism 28 contracted (step S3 in FIG. 7). Thereby, the lower positioning pin 25 positions the lower facing member 3B of the bracket 1. At this time, the bracket 1 is supported in a state of being levitated from the work table 11B.

  Next, the boss member 2 in the supply device is gripped by the handling device 40 and placed between the opposing members 3 of the bracket 1 positioned by the bracket positioning device 20. The handling device 40 operates to hold the bolt insertion hole 4 of the opposing member 3 and the bolt insertion hole 6 of the boss member 2 in alignment (step S4 in FIG. 7).

  By the way, since the bracket 1 is a plate-shaped member formed in a U shape by pressing or the like, in an initial state, the opposing members 3 are slightly opened toward the tip by a springback or the like. Yes. For this reason, as shown in FIG. 9, when the boss member 2 is disposed on the bracket 1 by the handling device 40, the boss member 2 is disposed so as to abut against the inner wall surface (lower surface) of the upper facing member 3 </ b> A of the bracket 1. In this way, by placing the boss member 2 against the upper facing member 3A of the bracket 1, the bracket 1 that is floating-supported according to the position of the boss member 2 moves upward. For this reason, the clearance gap between the opposing member 3 of the bracket 1 and the boss member 2 can be ensured reliably, and the boss member 2 can be smoothly arranged without contacting the tip of the opposing member 3 of the bracket 1. Further, the boss member 2 can be smoothly disposed between the opposing members 3 of the bracket 1 without increasing the positioning accuracy in the vertical direction with respect to the bracket 1 of the handling device 40 in which the boss member 2 is disposed.

  Next, as shown in FIG. 10, the boss member 2 is lowered by the handling device 40, thereby lowering the bracket 1 that is in a floating state, and the lower opposing member 3 </ b> B of the bracket 1 is moved to the work table 11 </ b> B and the boss member 2. The bracket 1 is fixed and held between the two end surfaces (step S5 in FIG. 7). Thereby, the bracket 1 is hold | maintained on the basis of the lower opposing member 3B. Since the bracket 1 has a shape in which the opposing members 3 are slightly opened toward the tip, the posture of the bracket 1 is slightly rotated with reference to the lower opposing member 3B. Then, the engagement state between the upper positioning pin 21 and the upper bolt insertion hole 4A temporarily shifts as shown in FIG. However, since the tip of the upper positioning pin 21 has a spherical shape 21A or a tapered shape 21B, even if the position of the upper bolt insertion hole 4A of the bracket 1 moves, it engages with the edge of the upper bolt insertion hole 4A. Therefore, the engaged state is maintained at a position where the bracket 1 is pushed back slightly upward, and the posture change of the bracket 1 is allowed.

  The lower positioning pin 25 is lowered from the positioning position engaged with the lower bolt insertion hole 4B of the bracket 1 to the intermediate position along the positioning axis C by the vertical cylinder 27 (step S6 in FIG. 7), and then the horizontal axis The cylinder 26 returns from the intermediate position on the positioning axis C to the standby position (step S7 in FIG. 7). Even when the lower positioning pin 25 is returned to the standby position, the posture of the bracket 1 changes because the lower facing member 3B is fixed and held between the work table 11B and the end surface of the boss member 2. There is nothing.

  Next, as shown in FIG. 12, the socket 31 of the bolt insertion device 30 is moved from the standby position to the intermediate position on the positioning axis C of the lower positioning pin 25 while holding the bolt 7 (procedure of FIG. 7). S8) Ascending from the intermediate position along the positioning axis C by the vertical axis cylinder. The held shaft portion 7A of the bolt 7 is raised and protrudes through the through hole 11C provided in the work table 11B. Next, the shaft portion 7A of the bolt 7 is sequentially inserted into the lower bolt insertion hole 4B of the bracket 1 and the bolt insertion hole 6 of the boss member 2 (step S9 in FIG. 7). The tip of the bolt shaft portion 7A is formed in a tapered shape 7B in order to facilitate alignment of the shaft centers of the bolt insertion hole 4 provided in the bracket 1 and the bolt insertion hole 6 of the boss member 2. For this reason, even if the axial centers of the bolt insertion hole 4 provided in the bracket 1 and the bolt insertion hole 6 of the boss member 2 are shifted from each other, they can be fitted while being aligned.

  When the tip of the bolt shaft portion 7A reaches the center region of the bolt insertion hole 6 of the boss member 2, the boss member 2 is raised by the handling device 40 as shown in FIG. The upper facing member 3A is brought into contact (step S10 in FIG. 7). When the upper opposing member 3A is pushed up by the boss member 2, the upper bolt insertion hole 4A provided in the upper opposing member 3A is pressed against the upper positioning pin 21, and as shown in FIG. And the engagement state of the upper positioning pin 21 are recovered. Thereby, the bracket 1 is in the initial positioning in which the upper bolt insertion hole 4A is engaged with the upper positioning pin 21 and the lower bolt insertion hole 4B is engaged with the bolt shaft portion 7A from the posture change state in step S5. Return to the state posture.

  When the shaft portion 7A of the bolt 7 is further raised, as shown in FIG. 15, the top end of the bolt shaft portion 7A is inserted into the upper bolt insertion hole 4A and is engaged with the upper bolt insertion hole 4A from above. Contact the pin 21. At this time, the upper positioning pin 21 is moved from the positioning position engaged with the upper bolt insertion hole 4A of the bracket 1 to the intermediate position along the positioning axis C by the vertical cylinder 23, and then the positioning shaft by the horizontal cylinder 22 The intermediate position on C is returned to the standby position (step S11 in FIG. 7). When the bolt 7 is lifted, the shaft portion 7A is engaged with the upper bolt insertion hole 4A of the bracket 1 and protrudes from the upper bolt insertion hole 4A of the bracket 1 at the limit position as shown in FIG. 7 is inserted.

  In this state, the nut 8 is screwed into the tip of the bolt 7 protruding from the upper bolt insertion hole 4A of the bracket 1 by a nut runner (not shown), so that the workpiece W in the assembled state shown in FIG. 1 can be obtained (FIG. 7). Step S12). Next, the bolt fastening device 10 lowers the socket 31 from the limit position to the intermediate position by the vertical axis cylinder, and then returns the socket 31 from the intermediate position on the positioning axis C to the standby position by the horizontal axis cylinder. The work W assembled as described above is carried out from the work table 11B to the next process by the handling robot (step S13 in FIG. 7).

  In the above-described embodiment, the boss member 2 has been described as having the anti-vibration rubber 5A between the outer cylinder 5B and the inner cylinder 5C. However, if the member has the bolt insertion hole 6, the anti-vibration rubber 5A will be described. May not be provided, and may not be a cylindrical member.

  Moreover, although the U-shaped thing was demonstrated as the bracket 1, as long as it has the opposing member 3 arrange | positioned at the both ends of the boss | hub member 2, even if it has shapes other than U-shaped. Good.

  In addition, the workpiece W is used for an attachment portion with an anti-vibration member such as an attachment portion of the suspension link or arm of the vehicle on the vehicle body side (suspension member) and the axle side and an attachment portion of the suspension member to the vehicle body. Explained what to do. However, the present invention can also be applied to bolt fastening between the bracket 1 having the other bolt insertion holes 4 and the member having the bolt insertion holes 6.

  In the present embodiment, the following effects can be achieved.

  (A) A boss member 2 having a bolt insertion hole 6 is disposed between the opposing members 3 of the bracket 1 having the opposing member 3 provided with the bolt insertion holes 4 respectively. This is a bolt fastening method in which the bracket 1 and the boss member 2 are fastened by inserting the bolt 7. Specifically, the bracket 1 is arranged on the work table 11B so that the facing member 3 is positioned in the vertical direction, and the upper positioning pin 21 and the lower positioning pin 25 are respectively inserted into the bolt insertion holes 4 of the facing member 3. The bracket 1 is positioned by engaging from above and below, and the boss member 2 is disposed between the opposing members 3 of the bracket 1. Then, the boss member 2 is urged toward the lower facing member 3B side of the bracket 1, the lower facing member 3B is pressed against the work table 11B, the bracket 1 is positioned, and the lower positioning pin 25 is moved downward. The member 3B is detached from the bolt insertion hole 4B.

  Thereby, even if the lower positioning pin 25 is detached, the position accuracy of the axis of the bolt insertion hole 4B of the lower facing member 3B of the bracket 1 is ensured in the positioning state set by the lower positioning pin 25. Can do. In addition, by removing the lower positioning pin 25, the bolt insertion hole 4B provided in the lower facing member 3B of the bracket 1 can be opened, so that the bolt shaft portion 7A can be inserted. For this reason, the shaft portion 7A of the bolt 7 is continuously inserted into the bolt insertion hole 4B of the lower facing member 3B, and sequentially inserted into the bolt insertion hole 6 of the boss member 2 and the bolt insertion hole 4A of the upper facing member 3A. Can do.

  (A) The vertical positioning pin supports the bracket 1 so as to be movable in the vertical direction by the floating mechanisms 24 and 28. For this reason, by urging the boss member 2 toward the lower facing member 3B side of the bracket 1, the operation of positioning the bracket 1 by pressing the lower facing member 3B against the work table 11B can be facilitated. Even when the boss member 2 is disposed between the opposing members 3 of the bracket 1, the upper and lower sides of the bracket 1 are not affected even if one of the upper and lower ends of the boss member 2 abuts the inner wall surface of the opposing member 3 of the bracket 1. By moving in the direction, the boss member 2 can be smoothly arranged between the opposing members 3.

  (C) The boss member 2 is disposed between the opposing members 3 of the bracket 1 while placing the upper surface of the boss member 2 against the inner wall surface of the upper opposing member 3A of the bracket 1. In this way, by placing the boss member 2 against the upper facing member 3A of the bracket 1, the bracket 1 supported so as to be movable in the vertical direction moves upward and downward in accordance with the position of the boss member 2. To do. For this reason, the clearance gap between the opposing member 3 of the bracket 1 and the boss member 2 can be ensured reliably, and the boss member 2 can be smoothly arranged without contacting the tip of the opposing member 3 of the bracket 1. Further, the boss member 2 can be smoothly disposed between the opposing members 3 of the bracket 1 without increasing the positioning accuracy in the vertical direction with respect to the bracket 1 of the handling device 40 in which the boss member 2 is disposed.

  (D) When the bolt shaft portion 7A is inserted into the bolt insertion hole 4A of the upper facing member 3A of the bracket 1 of the bracket 1, the boss member 2 is urged toward the upper facing member 3A and the upper facing member 21 is biased toward the upper positioning pin 21. Position 3A. That is, when the upper facing member 3A is pushed up by the boss member 2, the bolt insertion hole 4A provided in the upper facing member 3A is pressed against the upper positioning pin 21, and the bolt insertion hole 4A and the upper positioning pin 21 are The engagement state can be recovered. Thus, the bracket 1 is positioned by engaging the bolt insertion hole 4A of the upper opposing member 3A with the upper positioning pin 21 from the posture change state during positioning by pressing the lower opposing member 3B against the work table 11B. can do. That is, the position of the lower facing member 3B is returned to the initial positioning state in which the bolt insertion hole 4B is engaged with the bolt shaft portion 7A and the bolt insertion hole 4A of the upper facing member 3A is engaged with the upper positioning pin 21. Can be made. For this reason, it is possible to smoothly insert the upper facing member 3A of the subsequent bolt shaft portion 7A into the bolt insertion hole 4A.

  (E) The top end of the upper positioning pin 21 and the lower positioning pin 25 has a spherical shape 21A, 25A or a tapered shape 21B, 25B. For this reason, even if the dimension and shape of the bolt insertion hole 4 of the opposing member 3 engaged for positioning are changed, the bolt insertion hole 4 is within a range in which the engagement with the positioning pins 21 and 25 is possible. The bracket 1 can be positioned via That is, since the positioning pins 21 and 25 have spherical shapes 21A and 25A or tapered shapes 21B and 25B, there is no need to change the positioning pins 21 and 25 for each shape and size of the bolt insertion hole 4 of the bracket 1. The cost can be reduced.

W Work 1 Bracket 2 Boss member 3 Opposing member 3A Upper facing member 3B Lower facing member 4, 6 Bolt insertion hole 4A Upper bolt insertion hole 4B Lower bolt insertion hole 7 Bolt 7A Bolt shaft portion 7B Bolt tip 8 Nut 10 Bolt fastening device 11 Jig base 11B Work table 11C Through hole 20 Bracket positioning device 21 Upper positioning pin 21A, 25A Spherical shape 21B, 25B Taper shape 22, 26 Horizontal axis cylinder 23, 27 Vertical axis cylinder 24, 28 Floating mechanism 25 Lower positioning pin 30 Bolt insertion device 31 Socket 40 Handling device

Claims (9)

A boss member having a bolt insertion hole is arranged between the opposing members of the bracket having a bolt insertion hole and an opposing member, and the bracket and the boss member are fastened by inserting bolts into both bolt insertion holes. In the bolt fastening method,
The bracket is arranged on the work table so that the opposing member is positioned in the vertical direction,
The bracket is positioned by engaging the upper positioning pin and the lower positioning pin from above and below in the bolt insertion holes of the facing member, respectively.
A boss member is arranged between the opposing members of the bracket,
The boss member is urged toward the lower opposing member side of the bracket, the lower opposing member is pressed against the work table, and the bracket is positioned.
The lower positioning pin is removed from the bolt insertion hole of the lower facing member,
A bolt fastening method, wherein the shaft portion of the bolt is inserted into a bolt insertion hole of the lower facing member and is sequentially inserted into the bolt insertion hole of the boss member and the bolt insertion hole of the upper facing member.   The bolt fastening method according to claim 1, wherein the vertical positioning pins support the bracket so as to be movable in the vertical direction.   The bolt according to claim 1 or 2, wherein the boss member is arranged between the opposing members of the bracket while the upper surface of the boss member is applied to the inner wall surface of the upper opposing member of the bracket. Fastening method.   When the bolt shaft portion is inserted into the bolt insertion hole of the upper facing member of the bracket, the boss member is biased toward the upper facing member to position the upper facing member with respect to the upper positioning pin. The bolt fastening method according to any one of claims 1 to 3. A boss member having a bolt insertion hole is arranged between the opposing members of the bracket having a bolt insertion hole and an opposing member, and the bracket and the boss member are fastened by inserting bolts into both bolt insertion holes. In the bolt fastening device to
A work table on which the bracket is arranged so that the opposing member is positioned in the vertical direction;
An upper positioning pin and a lower positioning pin that engage the bolt insertion holes of the opposing member from the vertical direction to position the bracket;
A handling device that arranges a boss member between the opposing members of the bracket, biases the boss member toward the lower opposing member side of the bracket, presses the lower opposing member against the work table, and positions the bracket;
The lower positioning pin is detached from the bolt insertion hole of the lower opposing member, the shaft portion of the bolt is inserted into the bolt insertion hole of the lower opposing member, the bolt insertion hole of the boss member and the bolt of the upper opposing member And a bolt inserting device that sequentially inserts into the insertion hole.   The vertical positioning pin is supported by a floating mechanism that is movable by a predetermined amount in the forward / backward direction and biased in a protruding direction by a spring, and supports the bracket so as to be movable in the vertical direction. 5. The bolt fastening device according to 5.   The said handling apparatus arrange | positions the said boss member between the opposing members of the said bracket, applying the upper surface of the said boss member to the inner wall face of the upper opposing member of the said bracket. The bolt fastening device described.   The bolt fastening device according to any one of claims 5 to 7, wherein tip ends of the upper positioning pin and the lower positioning pin have a spherical shape or a tapered shape.   The handling device biases the boss member toward the upper facing member and positions the upper facing member with respect to the upper positioning pin when the bolt shaft portion is inserted into the bolt insertion hole of the upper facing member of the bracket. The bolt fastening device according to any one of claims 5 to 8, wherein the bolt fastening device is provided.

Images