JPH0687177U - Strut assembly nut tightening device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a nut tightening device for a strut assembly with improved workability. [Structure] A nut 7 is screwed onto a screw portion 6 of a strut shaft 2 located at the end of a strut assembly T. Particularly, the nut 7 is non-rotatably supported on the base frames 25 and 26 and is squarely locked. The shaft detent member 32 having the portion 44 formed therein, the tightening tubular member 33 loosely fitted to the outside of the shaft anti-rotation member 32, the socket 34 that rotates integrally with the tightening tubular member 33, and the base frame 25. , 26
A nut runner 37 that applies a rotational force to the drive gear 35 that is supported by the fastening cylinder member 33 and is integral with the drive gear 35 through the gear train 36. The square hole 601 of the screw portion 6 of the strut shaft and the nut 7 of the screw portion 6 are provided. Against the square locking part 44
And the socket 34 are configured to be fitted with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a nut tightening device for tightening a nut on a screw portion of a strut shaft located at an end portion of a strut assembly that serves as an axle suspension.

[0002]

[Prior art]

 The strut type is widely used as one of the suspension systems for the axles of vehicles, especially passenger cars. As shown in FIG. 10, the strut-type suspension is a coil in which a strut shaft T3 that slides in the axial direction is fitted in a tubular strut T2, and one end of which is locked to the outer wall of the strut outside the strut T2. The spring T1 is externally fitted. At the time of assembling the strut assembly T, as shown in FIG. 1, the spring bearing T4 and the mount insulator T5 at the other end of the coil spring T1 are tightened and fixed to the screw portion 6 at the end of the strut shaft 2 by using a nut. To do.

As described above, when assembling the strut assembly T, it is necessary to perform a tightening operation for tightening the nut on the screw portion 6 of the strut shaft. At the time of tightening the nut, conventionally, an impact wrench was used to temporarily tighten the nut on the screw portion 6 of the strut shaft, and then a special tool was used to check the torque.

[0004]

[Problems to be solved by the device]

 As described above, when the nut is fastened to the screw portion 6 of the strut shaft by using the impact wrench, the strut shaft 2 rotates together with the nut, and the strut shaft 2 idles around the strut T2. was there. In such a case, the tightening time of the nut is extended, which causes a problem of increased work time. Moreover, in some cases, it is necessary to prevent the rotation of the strut shaft 2 by using an appropriate holding tool inserted through the gap of the coil spring T1. In such a case as well, the work time is greatly extended, and workability is improved. Was causing problems. An object of the present invention is to provide a nut tightening device for a strut assembly having improved workability.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a strut assembly nut tightening device in which a nut is screwed to a thread portion of a strut shaft located at an end portion of the strut assembly, on a fixed base frame. A shaft-shaped shaft stopper member which is non-rotatably supported and has a square locking portion formed at its tip, and the base in a state where the shaft stopper member is concentrically loosely fitted to the outside of the shaft stopper member. A tightening cylinder member that is pivotally supported by the frame, a socket that is supported so as to rotate integrally with the tightening cylinder member and that fits into the nut, and a socket that is supported by the base frame and is integrated with the tightening cylinder member. Has a nut runner that applies a rotational force to the drive gear of the strut shaft through a gear train, and has a pre-formed square hole at the tip of the screw portion of the strut shaft and the screw portion of the screw portion. The angular locking portion and the socket, characterized in that it is configured to fit respectively Tsu bets.

[0006]

[Action]

 By driving the nut runner, the square locking portion and the socket are fitted into the square hole and the nut of the screw portion which are formed in advance at the tip of the screw portion of the strut shaft. The rotational force is transmitted to the nut through the gear train, the drive gear, the tightening cylinder member and the socket, and the nut can be easily screwed to the screw portion of the strut shaft which is prevented from rotating.

[0007]

【Example】

 FIG. 1 shows a nut tightening device for a strut assembly according to an embodiment of the present invention. This nut tightening device S1 is mounted on a base frame 10 to 14 together with a pulling device S2 to be described later, and the nut 7 is easily tightened to the screw portion 6 of the strut shaft 2 (see FIG. 10) of the strut assembly T for a vehicle. it can. As shown in FIGS. 2 and 3, the base frame B here is a lower base frame 10 fixed to a floor (not shown), a vertical base frame 11 standing upright from the lower base frame, and a rear base frame provided side by side. The rear vertical base frame 12, the left and right vertical base frames 13 and 14 arranged side by side on the left and right of the vertical base frame 11, and the horizontal fixed to the upper ends of the vertical base frame 11 and the left and right vertical base frames 13 and 14, respectively. The base frame 15, the vertical base 16 provided so as to extend further upward from the upper surface of the horizontal base frame 15, and mounted on the front surface of the vertical base 16 so as to be movable laterally relative to the vertical base 16. And a sliding base 17.

The vertical base frame 11 is provided with a strut holding device S3 at its front portion, and the strut assembly T is held in the set position A in a vertical direction by the holding device. The vertical base 16 is supported on the sliding base 17 above the vertical base frame 11 via a linear way 18 (see FIG. 3) so as to be horizontally movable. Here, the vertical base frame 11 is provided with two upper and lower rows of linear ways 18, and a device switching cylinder 19 is arranged between them. The upper and lower two rows of linear ways 18 form a straight ball bearing in which the sliding resistance in the linear direction is reduced by the ball bearings, and the sliding base 17 can be moved laterally smoothly with respect to the vertical base 16. I can. The device switching cylinder 19 can alternately switch and hold the nut tightening device S1 and the pulling device S2 to the working position B (see FIG. 2) located on the extension of the set center line L of the vertical base frame 11. Reference numeral 20 in FIG. 3 indicates a limit switch composed of a proximity switch, and the control unit of the operation panel (not shown), which detects the position information of the sliding base 17 by the output of this switch, stops the operation of the device switching cylinder 19. be able to.

On the front wall of the sliding base 17, a center line L1 of the nut tightening device S1 and a center line L2 of the pulling device S2 are juxtaposed at a predetermined distance a. The interval a here is configured to correspond to the stroke of the device switching cylinder 19. As shown in FIGS. 1, 4, 5, and 6, the nut tightening device S1 is supported on a tightening base 21 which is vertically movable with respect to the sliding base 17. The tightening base 21 has a sliding member 22 fixed to the back surface thereof, and the sliding member is non-detachably fitted to a vertically long vertical rail 23 fixed to the sliding base 17. . Moreover, the upper and lower support bases 25 and 26 are integrally attached to the front surface of the tightening base 21, and the upper support base 25 is connected with the tip of a vertically long vertical rod 27. The vertical rod 27 extends from the up / down switching cylinder 28. The up / down switching cylinder 28 is connected via a pin 30 to the tip of a bracket 29 which is integral with the sliding base 17.

Here, the up / down switching cylinder 28 is operated by switching a switch on an operation panel (not shown) so that the tightening base 21 is moved to the upper retracted position (see reference numeral P2 in FIG. 4) and the lower working position P1 (see FIG. 4). 1 and the position shown by the solid line). In addition, reference numeral 24 in FIG. 1 denotes a lower stopper 24 having a shock absorbing portion 241 having an elastic member (not shown) built therein. In this lower stopper, the tightening base 21 is at a working position P 1 (position shown by a solid line in FIG. 1). It functions to perform positioning and shock absorption at the time of reaching. Reference numeral 30 in FIG. 4 and reference numeral 31 in FIG. 5 both denote limit switches made up of proximity switches. The outputs of these switches detect the state in which the tightening board 21 has reached the retracted position P2 or the working position P1 and are switched up and down. The operation of the cylinder 28 can be stopped. As shown in FIG. 1, the upper and lower support bases 25 and 26 are provided with a shaft rotation preventing member 32 which is a main part of the nut tightening device S1 and a tightening tubular member 33 which is concentrically loosely fitted to the outside of the shaft rotation preventing member 32. And a socket 34 that is supported so as to rotate integrally with the tightening cylinder member 33, and a nut runner 37 that applies rotational force to the drive gear 35 that is integral with the tightening cylinder member 33 via the gear train 36. Has been done.

The shaft detent member 32 has its upper part supported in the center of a substantially cup-shaped bracket 38 integral with the upper support 25 so as to be vertically movable so as not to rotate, and has its lower part integrated with the lower support 26 in a vertical thickness. The plates 39 and 40 are supported by the first bearing 41 and the tightening cylinder member 33. The bracket 38 has a square hole 381 formed in the lower portion thereof, and the square shaft portion 321 of the shaft rotation stopping member 32 is slidably fitted therein. The bracket 38 accommodates a spring receiver 42 and a spring 45 supported by a cover 43 inside. The spring 45 can apply its elastic force downward to the shaft detent member 32. The shaft detent member 32 has a hexagonal shaft portion 44 serving as a square locking portion protruding from the lower end thereof, and the hexagonal shaft portion 44 is formed so as to be fitted into a hexagonal recessed hole 601 formed in advance at the upper end of the strut shaft 2. Has been done. Reference numeral 48 in FIG. 1 denotes a ball stopper, which is housed in the space formed by the long groove 46 at the lower end of the tightening tubular member 33 and the long groove 47 of the shaft anti-rotation member 32 so that the two long grooves can be separated from each other. It works to regulate the maximum deviation.

The tightening cylinder member 33 is supported at the upper and lower two places on the upper side of its tip end by the respective first bearings 41, and the socket 34 is relatively non-rotatably attached to the small diameter part at the lower end through a spline (not shown). It is slidably fitted on the outside. Here, the tightening tubular member 33 is loosely fitted inside the tubular cover 50 integrally supported by the lower support 40. A spring 49 is mounted between the socket 34 and the flange portion of the tightening cylinder member 33, which allows the socket 34 to be elastically projected and biased by a predetermined amount. Reference numeral 51 in FIG. 1 denotes a stopper that restricts the maximum protruding amount of the socket 34, and the stopper is formed so as to be engageable with a not-shown locking portion on the inner wall of the tubular cover 50. The drive shaft 371 of the nut runner 37 is connected to the drive gear 35 integrated with the tightening cylinder member 33 via the gear train 36 including the first gear 361 and the second gear 362. The first gear 361 and the second gear 362 are pivotally supported by the upper and lower support bases 39 and 40 via the second bearing 52 and the third bearing 53, respectively. The nut runner 37 is configured to be driven by a switch operation on an operation plate (not shown) and to stop its rotation when a predetermined tightening torque is reached.

On the other hand, the pulling-out device S2 shown in FIGS. 2, 7 and 8 is supported on the pulling-out base 60 which is vertically movable with respect to the sliding base 17. The pull-out base 60 has a sliding member 61 fixed to the back surface thereof, and the sliding member is non-detachably fitted to a vertically long vertical rail 62 fixed to the sliding base 17. It Moreover, the pull-out base 60 is connected to the bracket 601 projecting from the side of the pull-out base 60 at the tip of the vertically long vertical rod 65. The vertical rod 65 extends from a vertical switching cylinder 66 supported by the sliding base 17. The up / down switching cylinder 66 is operated by switching a switch on a control panel (not shown) to move the pulling-out board 60 to an upper retracted position (see reference numeral Q2 in FIG. 2) and a lower working position Q1 (see solid lines in FIGS. 7 and 8). It can be switched and held alternately with the position shown). A pull-out cylinder 63 is provided on the upper front side of the pull-out base 60, a pressing bracket 64 is provided at the lower side, and a pull-out slide frame 67 that is vertically moved by the pull-out cylinder 63 in the middle and a holding cylinder on the pull-out slide frame 67. 68 are respectively supported.

The pull-out sliding frame 67 is formed by left and right side plates 671, an upper thick plate 672 to which the vertical rods 27 are connected, a central plate 673 supporting the holding cylinder 68, and a lower thick plate 674. Rollers 69, 69 are rotatably supported on the surfaces of the upper thick plate 672 and the lower thick plate 674 facing the pull-out base 60, respectively. As shown in FIG. 8, both rollers 69 are fitted into the vertical grooves 71 of the guide frame 70 fixed to the drawing base 60, thereby controlling the displacement of the drawing slide frame 67 vertically moved by the drawing cylinder 63. is doing. A pair of holding frames 73 are pivotally supported at the lower end of the pull-out sliding frame 67 via pins 72. A pair of link pieces 74 are pin-coupled to the upper ends of the pair of holding frames 73, and the other ends of the pair of link pieces 74 are overlapped with each other, and the rods of the pull-out cylinder 63 are inserted through the pins 75. Is connected to a movable piece 76 that is integral with the.

A holding piece 77 is integrally fixed to the lower ends of the pair of holding frames 73, and the holding pieces 77 of the same pair are formed so as to form a nut-shaped inner groove by being overlapped with each other. Here, the inner grooves of the pair of holding pieces 77 are shaped so that the screw portion 6 of the strut shaft 2 can be fitted therein, whereby the pull-out cylinder 63 is actuated in the projecting direction (downward in FIG. 8) at appropriate times. When the pair of clamping pieces 77 interlocking with the movable piece 76 are clamped from the open position (shown by the chain double-dashed line in FIG. 8), the screw portions 6 of the strut shaft 2 can be securely clamped without slipping.

In FIG. 7, reference numeral 78 indicates a limit switch composed of a proximity switch, which outputs when the pull-out board 60 reaches the lower working position Q1 (position shown by solid lines in FIGS. 7 and 8). It can be activated to stop the operation of the extraction cylinder 63 via a control panel (not shown). Similarly, in FIG. 8, reference numerals 79 and 80 respectively indicate limit switches composed of proximity switches, and when the pull-out sliding frame 67 faces the limit switches 79, the pull-out sliding frame 67 moves to the pull-out position R1. When the pull-out sliding frame 67 faces this (the position shown by the solid line in FIG. 8), the limit switch 80 outputs that the pull-out sliding frame 67 has reached the holding position R2, Each of them can work to stop the operation of the clamping cylinder 68 via a control unit of a control panel (not shown). The strut holding device S3 shown in FIG. 2, FIG. 3, FIG. 9 and FIG. 10 is installed in the front part of the vertical base frame 11 so as to face up and down, and the first holding means K1, the second holding means K2 and the third holding means are arranged in order from the top. Means K3 are provided, below which strut receiving means K4 is provided.

As shown in FIG. 11, the first pinching means K 1 pivotally supports the pair of first pinching arms 102 for pinching the spring T 1 on the upper part of the strut assembly T, and the pinching arms via the vertically oriented pins 101. And a pair of brackets 100 fixed to the left and right walls of the vertical base frame 11, a first cylinder 103 and a movable rod 104 thereof which are pin-coupled to the rear pivoting ends of the pair of first holding arms 102, respectively. , And a holding member 105 that is connected to the front rotary ends of the pair of first holding arms 102 via pins 106, respectively. Springs 107, one end of which is locked to spring stoppers 108, are provided on the front pivoting ends of the pair of first clamping arms 102, and the clamping members 105 are provided on the vertical base frame 11 side by these springs. The end portion is pulled toward the spring stop portion 108 side and biased. In FIG. 11, reference numeral 109 is a stopper for positioning the pair of first holding arms 102 at the standby position, and reference numeral 110 is the holding position for the pair of first holding arms 102 (the position shown by the solid line in FIG. 11). The stopper for positioning is shown.

Here, when the first cylinder 103 projects and operates by a switch operation of a control panel (not shown), the pair of first clamping arms 102 starts a clamping operation in conjunction with it. At this time, the pair of first clamping arms 102 abut the spring T1 on the upper part of the strut assembly, and the pair of clamping members 105 rotate around the pins 106 so that the clamping surfaces reliably clamp the spring from the left and right. When the pair of first pinching arms 102 pinch the spring T1 with a predetermined pinching force on it and the pair of first pinching arms 102 reach the pinching position regulated by the stopper 110, a limit switch (not shown) is used. It is configured such that further projecting operation is stopped according to the output of the sandwiched position output.

As shown in FIGS. 12 and 13, the second pinching means K2 includes a pair of second pinching arms 111 for pinching the central portion of the sprue T1 of the strut assembly, and the pinching arms 121 for vertically inserting the pinching arms. Brackets 112 that are pivotally supported and fixed to the rear wall of the vertical base frame 11, a second cylinder 113 and a movable rod 114 thereof that are pin-coupled to the rear pivot ends of the pair of second holding arms 111, respectively. , A clamping member 114 integrally attached to the front rotation ends of the pair of second clamping arms 111, and a lateral pin 115 (see FIG. 13) on the front upper surface of the pair of second clamping arms 111. The vertically rotating plate 116 to be mounted, the rotating protruding frame 117 integrally provided on the vertically rotating plate 116, and the vertically oriented pin 119 which is housed in the central space 118 of these rotating protruding frames 117. Is pivoted through It is composed of a pair of rotation locking pieces 120 and a fixed side holding member 123 which is directly supported on the front surface (the lower surface in FIG. 12) of the vertical base frame 11.

Reference numeral 122 in FIG. 13 indicates a stopper which is elastically projected upward and biased, thereby supporting the vertical rotation plate 116 at a reference position (position shown by a solid line in FIG. 13) and rotating downward. It also has the function of absorbing the impact at the time. The pair of rotary locking pieces 120 pivotally mounted on the rotary protruding frames 117 via the vertically extending pins 119 have a spring 124 whose one end is locked to the rotary protruding frames 117 on the center side (spring T1). It is projected to the side and urged. In FIG. 12, reference numeral 125 is a stopper for positioning the pair of second holding arms 111 at the standby position, and reference numeral 126 (only the right side is shown in FIG. 12) is the second holding arm 111 holding position (see FIG. 12). 12 shows the stopper positioned at the position indicated by the solid line. Further, reference numeral 127 indicates a limit switch composed of a proximity switch, which is controlled by a control unit of a control panel (not shown) when the pair of second holding arms 111 reach the holding position (position shown by a solid line in FIG. 12). It can act to stop the operation of the cylinder 113.

Here, when the spring T1 is brought into contact with the fixed side holding member 123 and the second cylinder 113 is projected and enters into operation, first, the pair of second holding arms 111 hold the spring T1. At this time, the pair of sandwiching members 114 on the pair of second sandwiching arms 111 press the spring of the strut assembly T against the stationary side sandwiching member 123 to sandwich them. At the same time, the pair of rotation locking pieces 120 on the rotation protruding frame 117 are pushed into the gaps of the springs, and the vertical displacement of the springs can be regulated. That is, when the pair of rotation locking pieces 120 are pushed into the gap of the spring, the left and right vertical rotation plates 116 are rotationally displaced around the horizontal pins 115, and the pair of rotation engagement members are rotated around the vertical pins 119. The stop piece 120 is rotationally displaced, and the pair of left and right rotary engagement pieces 120 are reliably pushed into the gaps between the opposing springs T1.

As shown in FIG. 14, the third holding means K3 is integrated with a pair of third holding arms 130 for holding the struts T 2 of the strut assembly and a movable plate 153 on the vertical base frame 11 which will be described later. A movable base frame 131, a pair of rotary shafts 133 that are integrally coupled to the respective third holding arms 130, and that are pivotally supported by the movable base frame 131 in a vertical direction (a direction perpendicular to the plane of FIG. 14), A pair of gears 134 that are integrally coupled to the rotating shaft 133 and mesh with each other, a third cylinder 137 that is pin-coupled to the protruding portion 132 of the movable base frame 131 via a vertical pin 136, and a third cylinder 137. The movable rod 138 is constituted by a pin 139 for pin-joining the third holding arm 130. In FIG. 14, reference numeral 140 designates a vertically oriented pin that couples the pair of holding members 141 to the front rotation end side of the third holding arm 130.

The pair of third clamping arms 130 are configured to rotate in conjunction with each other by a pair of gears 134 to perform a clamping operation. When the third cylinder 137 is projected and operated by a switch operation of a control panel (not shown), the pair of third clamping arms 130 is switched from the retracted position shown by the chain double-dashed line to the clamping position shown by the solid line in conjunction therewith. At this time, the pair of sandwiching members 141 on the pair of third sandwiching arms 130 hits the strut T2, and the sandwiching surface rotates around each pin 140 so as to securely sandwich the strut from the left and right, and then the strut T1. Can be clamped with a predetermined clamping force. In this case, when the pair of third nipping arms 130 reach the nipping position, the third cylinder 137 is configured to stop further projecting operation in accordance with the nipping position signal output by the limit switch (not shown). ing.

As shown in FIGS. 9 and 10, the strut receiving means K4 is fixed to the lower front surface of the vertical base frame 11 and the lift cylinder 151 which is pin-connected to the lower part of the vertical base frame 11 via the bracket 150. Guide rail 152, a movable plate 153 supported by the guide rail 152 so as to be vertically movable, and an axle base 154 which is supported via the movable plate 153 and on which the axle of the strut assembly T is mounted. To be done. The movable plate 153 pivotally supports a plurality of rollers 156 that rotate in a non-detachable manner within the long groove 155 of the guide rail 152, whereby the strut assembly T moves vertically while holding the strut assembly T on the set center line L of the vertical base frame 11 at appropriate times. Is configured to let. The movable rod 157 of the lift cylinder 151 is provided with a pedestal 158 into which the recessed hole of the knuckle portion at the lower end of the strut assembly T can be fitted, and the pedestal is integrally coupled with the axle pedestal 154.

The above-mentioned movable base frame 131 of the third holding means K3 is fixed to the upper end of the movable plate 153, and the third holding means K3 and the axle shaft 154 on the movable plate 153 are attached to the vertical base frame 11. Can be vertically moved integrally by the lift cylinder 151. The nut tightening work of the vehicle strut assembly T by the nut tightening device S1, the pulling device S2 and the strut holding device S3 will be described.

First, the operator holds the strut assembly T in the set position A with the strut holding device S3 in the vertical direction. Prior to this, the lift cylinder 151 is operated by operating a switch on a control panel (not shown), and the third clamping means K3 on the movable plate 153, the axle base 154, the receiving base 158, etc. are set to the optimum vertical position. It will be. Here, the operator mounts the strut assembly T for vehicle so that the recessed hole at the lower end is fitted into the pedestal 158, and the spring T1 of the strut assembly abuts and holds the fixed side holding member 123 of the second holding means K2. To do. Next, a switch of a control panel (not shown) is turned on to cause the cylinders 103, 113 and 137 of the first holding means K1, the second holding means K2 and the third holding means K3 to project and operate, and each pair of the first holding means K1. The holding arm 102, the second holding arm 111, and the third holding arm 130 perform a holding operation, and the holding members 105, 114, and 141 hold the spring T1 and the strut T2 of the strut assembly. Moreover, the pair of left and right pivotal locking pieces 120 on the second holding arm 111 are pushed into the gaps of the spring T1 to reliably regulate the displacement of the spring in the vertical direction.

After that, the operator operates the switch on the operation panel (not shown) to operate the lift cylinder 151 to move up. In this case, as shown in FIG. 10, the spring T1 is compressed and displaced so as to push up the screw portion 6 of the strut shaft 2 from the standby position H1 to the holding position H2 by the lift amount b. After that, the device switching cylinder 19 is operated to slide the slide base 17, and the pulling device S2 is switched and held at the working position B with the set center line L as a common center. Further, a pull-out command is input by a switch on the operation panel (not shown). Then, the up / down switching cylinder 66 is driven to switch the pull-out base 60 to the work position Q1 (position facing the sandwiching position H2 in FIG. 10) below the upper retracted position (see reference numeral Q2 in FIG. 2). . Then, at the working position Q1, the pressing bracket 64 abuts on the boot T6 (see FIG. 8) that is fitted onto the strut shaft 2 and restricts its rise. Then, at the working position Q1, the holding cylinder 68 retracts to hold the pair of holding pieces 77 in the open position, and then the pull-out cylinder 63 descends the pull-out sliding frame 67 to move the pair of holding pieces 77 in the open position. It faces the threaded portion 6 of the strut shaft 2. Next, the clamping cylinder 68 performs a clamping operation, that is, a projecting operation, and the pair of clamping pieces 77 reliably clamps the screw portion 6 of the strut shaft 2 without slipping. After that, the pulling-out cylinder 63 operates the pulling-out sliding frame 67 upward to pull out the strut shaft 2 of the holding position H2 from the strut side by the lift amount c and hold it at the pulling-out position H3.

After this, the operator switches the holding cylinder 68 to the open position and operates the up / down switching cylinder 66 to return the pull-out base 60 to the upper retracted position (see reference numeral Q2 in FIG. 2). As a result, the screw portion 6 of the strut shaft is held at the protruding position H3.

After that, the operator outputs a retreat command to an operation panel (not shown) by using a retreat switch (not shown). Then, the up / down switching cylinder 66 returns the pull-out board 60 to the upper retracted position (see the reference numeral Q2 in FIG. 2). After that, the operator switches a switch on the operation panel (not shown) to slide the slide base 17 through the device switching cylinder 19, and the center line L2 of the nut tightening device S1 is moved to the working position B. Set to match. Next, the operator switches the tightening switch (not shown) on the operation panel (not shown) to start the operation of the nut tightening device S 1.

First, the up / down switching cylinder 28 switches the tightening board 21 to a work position P1 (position shown by a solid line in FIG. 1) below an upper retracted position (see reference numeral P2 in FIG. 4). Prior to this work, the operator attaches a spring bearing and a mount insulator to the screw portion 6 of the strut assembly T, and then a nut 7 is screwed. Furthermore, the nut runner 37 is already driven by the time the tightening base 21 reaches the working position P1. Therefore, the rotating socket 34 of the nut tightening device S1 is fitted into the nut 7, and the hexagonal shaft portion 44 on the shaft non-rotating member 32 in the non-rotating state is fitted into the hexagonal recessed hole 45 on the strut shaft 2. . Immediately after this fitting is completed, the nut 7 is screwed onto the screw portion 6, and when the predetermined tightening torque is reached, the nut runner 37 stops the operation of the socket 34.

As a result, the spring bearing and the mount insulator are fitted to the screw portion 6 of the strut shaft, and the nut 7 is securely tightened with a predetermined tightening torque, so that the nut tightening work of the strut assembly T is surely performed. Good workability. After that, the operator operates a retreat switch (not shown) to return the tightening board 21 to the upper retreat position (see reference numeral P2 in FIG. 4) by the up / down switching cylinder 28, and the switch of the control panel (not shown) When turned on, the cylinders 103, 113, 137 of the first holding means K 1, the second holding means K 2, and the third holding means K 3 are released, and each pair of the first holding arm 102 and the second holding arm 102 is released. 111 and the third holding arm 130 release the holding, and the strut assembly T that has been tightened is taken out.

[0032]

[Effect of device]

 As described above, in the nut tightening device of the strut assembly of the present invention, the square locking portion and the socket are simultaneously fitted into the square hole and the nut of the screw portion which are preformed in the screw portion of the strut shaft. Therefore, when the nut runner is driven, its rotational force is transmitted to the nut via the socket, and the nut can be securely screwed onto the screw part that is prevented from idling, and it can be used significantly. Time can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a nut tightening device for a strut assembly according to an embodiment of the present invention.

FIG. 2 is a schematic overall configuration diagram of an assembly device for a strut assembly including the nut tightening device of FIG.

FIG. 3 is a schematic overall side view of the assembling apparatus of FIG.

FIG. 4 is a side view of the upper portion of the nut tightening device of FIG.

5 is a front view of the nut tightening device of FIG. 1. FIG.

6 is a top front view of the nut tightening device of FIG.

FIG. 7 is a front view of the main parts of the extraction device in the assembly device of FIG.

8 is a side view of the main parts of the extraction device in the assembly device of FIG. 7. FIG.

9 is a front view of a main part of a strut holding device in the assembly device of FIG. 2. FIG.

FIG. 10 is a side view of a main portion of the strut holding device in FIG.

11 is a plan view of a first pinching means in the strut holding device of FIG. 9. FIG.

FIG. 12 is a plan view of a second pinching means in the strut holding device of FIG.

13 is a partially cutaway side view of the second holding means of FIG.

14 is a plan view of a third pinching means in the strut holding device of FIG. 9. FIG.

[Explanation of symbols]

 2 Strut shaft 6 Screw part 7 Nut 25 Base frame 26 Base frame 32 Shaft rotation stop member 33 Tightening cylinder member 34 Socket 35 Drive gear 36 Gear train 37 Nut runner 44 Square lock part 601 Square hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Teru Takemoto 1-1, Mizushima Kaigan-dori, Kurashiki City, Okayama Prefecture, Sanmizu Design Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A nut tightening device for a strut assembly in which a nut is screwed to a threaded portion of a strut shaft located at the end of the strut assembly, the non-rotatable support being provided on a fixed base frame, and the tip end portion. A shaft-shaped shaft stopper member having a square locking portion formed therein, and a tightening tubular member pivotally supported by the base frame in a state of being loosely fitted concentrically to the outer side of the shaft stopper member. , A socket that is supported so as to rotate integrally with the tightening cylinder member and that fits into the nut, and a drive gear that is supported by the base frame and that is integral with the tightening cylinder member and that rotates through a gear train. A nut runner for applying a force, and a square hole formed in advance at the tip of the screw portion of the strut shaft and the square locking portion for the nut of the screw portion, Serial socket nut tightening device configured strut assembly to fit respectively.