JPH0533233Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The device of the present invention is a bolt fastening device that can slide the tightening means along a guide member to a desired fastening position (operating position of the tightening means) and position it. It is related to the device.

(Prior art) For example, in order to attach large parts such as a suspension member and a power unit to a vehicle body, according to the prior art, in advance, each fastening position corresponding to the mounting position of the screw member of those parts is set. It was customary to operate a plurality of provided screw member tightening means to respectively tighten the screw members.

Therefore, when mounting multiple types of suspension members and power units with different characteristics on a vehicle body in response to diversifying needs, it is necessary to adjust the mounting position (fastening area) of each suspension member or power unit using screws. It was necessary to arrange in advance an equal number of tightening means in correspondence with the respective mounting positions. For example, in order to mount a power unit that combines engines and transmissions with different characteristics on the vehicle body, as shown in Fig. 8a and b, each engine mount rear A tightening means 3 is disposed at a fastening position corresponding to each of the fastening parts a to e' of 2, and the fastening means associated with each engine mount are selectively operated to mount the engine mount. In the figure, 4 indicates an engine, and 5 indicates a transmission, and for simplicity, one power unit is representatively shown.

Such a structure is the same in the case of a device for attaching a suspension member to a vehicle body, and as schematically shown in FIGS. Tightening means 3 were disposed in advance at the fastening positions corresponding to d' and these fastening means were selectively operated.

(Problem to be solved by the invention) For this reason, the conventional screw member fastening device requires a number of fastening means corresponding to the number of fastening parts of each of the plurality of parts to be mounted. Since the only fastening means required for fastening is the fastening means related to the fastening part of the part, the other fastening means are in an idle state and there is a problem that the fastening means cannot be used efficiently. Ta.

Furthermore, since the tightening means occupy a certain amount of space when they are arranged, even if the tightening means are placed close to each other in the fastening position, it is not possible to set the distance between the axes of adjacent tightening means below a certain value. First, there was a problem in that the fastening position could not be continuously adjusted according to the fastening position of the parts to be mounted.

This is especially true when assembling large parts such as suspension members and power units to the vehicle body, as the tightening torque of the screw members must be sufficiently high, and large-sized tightening means must be used. It was important.

In order to solve this problem, it is necessary to guide the movement of the tightening means with a guide rod and tighten a ball screw shaft attached to the guide rod, as in the screw tightening robot disclosed in JP-A-61-142031, for example. It is also conceivable to use a ball screw type moving mechanism that is screwed into a ball nut fixed to the means and whose ball screw shaft is rotated by a servo motor to move the tightening means to a desired position.

However, in a case like the present application, the vehicle assembly line usually has a
It is necessary to move the fastening means at high speed to the fastening position of the part whose type has been changed, and it is also necessary to use a large fastening means as described above. If an attempt is made to provide sufficient driving force and high support rigidity to move the tightening means at high speed, a problem arises in that the manufacturing cost of the device increases, and if the above-mentioned ball screw type moving mechanism is adopted, the control means The overall structure including the above is also more complicated than before, and this also poses a problem in that the manufacturing cost of the device increases.

The present invention was developed in view of these problems, and it is possible to reduce the number of required tightening means and to adjust the fastening position continuously and at high speed according to the fastening part of the parts. can,
The purpose is to provide a screw member fastening device with a large degree of freedom at a low cost.

(Means for solving the problem) In order to achieve this object, the device of the present invention provides a screw member fastening device for assembling multiple types of large parts to a vehicle body, which has multiple fastening positions that differ depending on the types of parts. a guide member arranged to extend in a predetermined direction corresponding to the arrangement direction of the guide members, a tightening means slidably supported by the guide member, and the tightening means sliding along the guide member. a cylinder-driven moving means that stops at a position corresponding to one of the plurality of fastening positions; a positioning member 45 integrally fixed to the tightening means and having a plurality of fitting portions corresponding to the plurality of fastening positions; a fitting member 47 capable of fitting into one of the plurality of fitting parts; and a pushing-up means 49 that operates under the control of the control means 51 to fit the fitting member into one of the plurality of fitting parts. It is characterized by having the following.

(Function) When the vehicle body and the large parts to be attached to the vehicle body are transported to a predetermined position, for example onto this screw member fastening device, the control means starts the moving means based on an arrival signal from a suitable sensing unit, for example. let The cylinder-driven moving means moves the tightening means along the guide member based on instructions from the control means.
It is moved at high speed to a fastening position corresponding to the fastening part of the above-mentioned parts to be installed. The control means then starts the tightening means to carry out the tightening operation. The tightening means applies a rotational motion to the screw member, and screws the screw member supplied by a suitable supply means into the screw member on the vehicle body side, thereby tightening the above-mentioned component to the vehicle body. On the other hand, when the tightening means completes the screw member fastening operation, the control means restarts the moving means to return the tightening means to the standby position in preparation for the next operation. Therefore, here, the tightening means can be moved continuously and at high speed to the fastening position corresponding to each fastening part, so it is only necessary to prepare the minimum necessary tightening means, and also for mounting large parts. Even if a large-sized tightening means is used, a simple cylinder-driven moving means that can easily exert a large driving force is used, so the apparatus can be manufactured at a low cost. The difficulty of positioning in the middle due to cylinder driving can be effectively improved by using a positioning member or the like. Note that the tightening means that has completed the screw member fastening work does not necessarily need to be returned to its standby position, and can be moved from the completed position to the screw member fastening position for the next process.

(Example) The screw member fastening device of the present invention will be described in detail below with reference to the drawings.

FIGS. 1a and 1b are a front view and a side view showing a first embodiment of a nut fastening device based on the present invention,
Reference numeral 11 indicates a frame disposed along the conveyance direction of the vehicle body and large components to be attached to the vehicle body.
Preferably, this frame 11 is attached to a suitable movable trolley (not shown). The frame 11 includes vertical members 13a arranged parallel to the direction indicated by arrow A in the figure, which is the vehicle body transport direction and also the arrangement direction of a plurality of fastening positions that differ depending on the type of parts, and these vertical members. A horizontal member 13 that intersects and is integrally fixed at both ends thereof.
It has a frame structure including b.

On the upper surface of each vertical member of the frame 11, rolling linear motion guide rails 15 having low sliding resistance and excellent straightness are laid in parallel to each other. A head 19, which has guide recesses 17 on its lower surface that fit into each of the guide rails 15, is slidably disposed on the guide rails (see FIG. 2).

Either side member 13b of the frame 11
A moving means 21 is disposed between the horizontal member and the head 19 facing the horizontal member. In this embodiment, an air cylinder capable of high-speed operation is used as the moving means, and the cylinder bottom is connected to the horizontal member 1.
3b and its rod end to the head 19. Note that it is preferable to use a double-acting type air cylinder in which the head 19 can be freely reciprocated along the frame 11 by adjusting the supply pressure. Further, the moving means is not limited to an air cylinder, but may be any means as long as it can reciprocate the head 19 at high speed; for example, it may be a hydraulic cylinder.

Therefore, in this embodiment, the head 19 can be continuously moved along the rolling linear motion guide by adjusting the supply and discharge of compressed air to and from the air cylinder serving as the moving means.

As shown in Fig. 2, an air cylinder as lifting means 23 is provided at the center bottom of the head 19, which has a T-shaped cross section and has guide recesses 17 on both sides of its lower surface that fit into the rolling linear guide rail 15 laid on the frame 11, as shown in Fig. 3. The tip of the piston rod of this air cylinder is connected to the head 19, which extends in the axial direction.
A connecting rod 25 is attached to pass through the connector.
A lift table 27 having a substantially flat plate shape is fixed to the protruding portion of the connecting rod 25 protruding from the upper surface of the head 19. Therefore, by operating the lift means 23, the lift table 27 can be raised and lowered as appropriate.

Furthermore, the device of this embodiment includes guide means to ensure smooth and reliable lifting and lowering movement of the lifting table 27. This guide means comprises a guide sleeve 29a extending parallel to the axis of the piston rod and fixed to the head 19, and a guide rod 29b fitted into these sleeves and slidable in the axial direction thereof. Then, a lifting table 27 is fixed to the protruding portions of these guide rods. Therefore, the elevating table 27 is guided in its elevating and descending motion by the guide means spaced apart from each other, so that the elevating table 27 performs smooth and reliable elevating and descending movements.

A support member 33 is attached to the head 19 via a mounting bracket 31 on the front end face and rear end face in the conveyance direction shown by arrow A, and furthermore, through this support member, a part of the head 19 is shown in FIG. A nut supply means 35, shown schematically, is fixed.

On the other hand, as shown in FIG. 2, the elevating table 27 is provided with tightening means 37 on both sides thereof. Lifting table 27 for these tightening means
The installation positions and installation parts in are determined based on the installation positions of parts to be attached to the vehicle body in one fastening operation, for example, the installation positions of the rear engine mount, which are four in this embodiment.
In addition, since the tightening means 37 is used for mounting large parts, it is sufficient that the tightening means 37 is of a relatively large size that can screw the nut supplied from the supply means 35 onto the fastening bolt on the vehicle body side with a relatively high torque. ,
The type, structure, etc. are not limited.

With such a configuration, the head 19 can be moved to a predetermined position along the rolling linear motion guide rail.
is moved at a high speed, and then the elevating table 27 is raised to bring the tightening means 37 close to the fastening site of the parts to be mounted, so that the fastening work can be performed with sufficient torque under high support rigidity.

By the way, in order to move the head 19 to a position, that is, to mount each large component, the tightening means 37 is
The point that should be moved between fastening operations is
If the position not only corresponds to the protruding position and the retracted position of the air cylinder as the moving means 21, but also lies between these positions, it is possible to uniquely determine the stop position of the head 19 that moves forward or backward with the air cylinder. It will be relatively difficult.

For this reason, in the present embodiment, as shown in FIG. 2, on the lower surface of one of the vertical members 13a of the frame 11 extending in the direction of movement of the head 19, there are provided rails extending parallel to the rolling and linear motion guide rails 15, respectively. existing 4
A grooved rail 39 having a book groove is secured, and a dog 41 is placed in each groove in alignment with the desired stopping position of the tightening means 37, respectively.

On the other hand, a grooved rail 39 is attached to the side of the head 19.
A set of four limit switches 43 are fixed so as to face each dog 41, and each limit switch is turned on and off at a position corresponding to each dog 41. Based on the ON and OFF signals of these limit switches, the air as a means of movement is The supply and discharge of pressurized fluid to the cylinder is controlled. Note that the number of grooves in the grooved rail 39 and the number of limit switches are determined in accordance with the number of positions at which the head is to be stopped, and are not limited to this embodiment.

Furthermore, in order to accurately determine the stopping position of the head 19, a limit switch 43 is fixed on the opposite side of the head 19, as shown in FIG. A positioning plate 45 as a positioning member having a correspondingly formed fitting recess as a fitting part is fixed. A push-up means 49 having a fitting chip 47 as a fitting member that fits into these fitting recesses is fixed to the lower surface of the other vertical member 13a of the frame 11 facing the positioning plate 45. In this embodiment, an air cylinder is used as the thrusting means, and a fitting tip is connected to the tip of the piston rod.
Further, the fitting recess has an enlarged opening in order to facilitate insertion of the tapered fitting tip.

Therefore, the head 19 is positioned approximately at a predetermined position based on the signal from the limit switch.
However, by fitting the fitting chip 47 into one of the fitting recesses of the positioning plate 45, accurate positioning is achieved, so the nut tightening means moves integrally with the head 19 via the lifting table 27 37 will be positioned to correspond exactly to the fastening site of the component to be installed.

FIG. 5 is a flowchart showing the control flow of the control means 51 in this embodiment, and the control means 51:
First, when the sensing unit 53 senses that the vehicle body and parts have arrived at a predetermined position, the moving means 21 is activated to move the head 19 along the rolling linear guide. Next, when the limit switch 43 is turned on by contact with the dog 41, the control means stops the moving means, operates the thrusting means 49, and moves the head 19.
position accurately. And the control means 51
The elevating means 23 is operated to push up the elevating table 27 to a predetermined position, and the tightening means 37 is further actuated to fasten a predetermined large component to the vehicle body. Note that the above operation is repeated until all the fastening operations at the plurality of fastening sites of the large component are completed. When the work of fastening the large parts to the vehicle body is completed, the control means 51 operates the moving means 21 again to return the head 19 to its initial position.
Complete the fastening work for a certain part and prepare for the fastening work for the next part.

FIG. 6 is a diagram showing another embodiment of this invention, in which parts equivalent to those shown in FIG. 1 are designated by the same reference numerals.

The frame 11 is fixed to a table 55 shown in phantom lines and is movable in a plane perpendicular to the drawing.
a horizontal member 13b extending parallel to the table 55;
The table also includes an upright member 13c that stands up perpendicular to the table. The rolling linear motion guide rails 15, 15 are arranged obliquely to this upright member 13c so as to be inclined at an angle corresponding to the arrangement direction of a plurality of fastening positions that differ depending on the type of suspension member described later. and is fixed via the fixing bracket 16a. Then, the heads 19, 19 are integrally fixed to a member that fits into the rolling linear motion guide rail. Each of these heads 19 has a moving means 2.
1, and the other end of the air cylinder, which extends substantially parallel to the guide rail, is fixed to a suitable immovable member (not shown).

A tightening means 37 is attached to each head 19 via a mounting bracket 57 so as to be movable in parallel to the extending direction of the upright member 13c.

Furthermore, although not shown in the figure, this device also has a limit switch that detects the dog, as in the previous example.
- Push-up means is provided for positioning the head 19 at a plurality of positions by fitting a fitting chip into one of the plurality of fitting recesses of the positioning plate based on the OFF signal.

Note that the reference numeral 13d is another upright member provided upright on the table 55 like the upright member 13c, and the tightening means 38 is attached to the mounting bracket 58.
58b is a guide member (not shown) that guides the mounting bracket 58 in the extending direction of the other upright member 13d. Together with the spring, it forms a normal buffering mechanism for the tightening means 38, and although this vertical buffering mechanism is not shown, it is also provided in the other tightening means 37.

When the suspension member 6, which is a large component, is attached to the vehicle body using such a nut fastening device, the control means 51 uses an output signal from the sensing unit 53 to position the suspension member 6 at a predetermined position. If it is determined that the tightening means 3 is
Activate 7 and 38. The tightening means ascends along the mounting brackets 57, 58a in the extending direction of the upright members 13c, 13d of the frame 11 to perform the tightening operation, and after completing the operation, descends and returns to the initial position.

On the other hand, when installing another type of suspension member indicated by the reference numeral 7, when the control means 51 determines that the suspension member 7 is placed at a predetermined position based on the output signal from the sensing unit 53, the control means 51 controls the moving means 21. The head 19 is actuated to move each head 19 diagonally along the rolling linear guide rail 15 to a fastening position corresponding to the fastening part of the suspension member 7. The control means 5 then actuates the tightening means 37 to carry out the tightening operation as described above. Note that in this case, the tightening means 38 is held at that position without operating.

Therefore, according to this embodiment, it is possible to mount a plurality of types of suspension members.
Further, according to this embodiment, since the rail 15 is inclined in accordance with the arrangement of the fastening positions, the head 19 and thus the fastening means 37 can be brought sufficiently close to the fastening site, and the fastening means 37 can be supported with particularly high support rigidity. At the same time, the tightening means 37 can be quickly moved to the fastening position, and the positioning accuracy of the head 19 can also be improved.

FIG. 7 shows a configuration in which the nut fastening devices shown in FIGS. 1 and 6 are integrated, and the power unit 1 and the suspension member 6 or 7, which are large components, can be mounted on the vehicle body B at the same time. This is another embodiment of the nut fastening device.

The nut fastening device 60 for mounting the rear engine mount and the nut fastening device 62 for mounting the power unit 62 have frames fixed to a movable table 64 movable in a horizontal plane. It is fixed to an elevating means 68 that supports it so that it can be moved up and down. Therefore, the both nut fastening devices can not only make relatively small positional adjustments using the moving table 64 and the lifting means 68, but also can greatly adjust the position by moving the cart 66 along the rail 70. Can be changed. A sensing unit 53 is attached to the bogie 66 via a support, and senses when the vehicle body B, power unit 1, suspension member, etc. have reached a predetermined position. Further, it is preferable that this sensing unit outputs a signal corresponding to the type of vehicle, and if the control means is operated based on this signal, it is easier to move the tightening means to the fastening site for each type of vehicle. becomes.

(Effects of the invention) As described in detail above, according to the device of the present invention, the tightening means is slid along the guide member in accordance with the respective fastening parts of multiple types of large parts to be attached to the vehicle body, and the fastening means are sequentially fastened. Since the structure is configured to perform the work, there is no need to prepare a number of fastening means equal to the number of fastening parts of each component, and the number of fastening means can be significantly reduced. Furthermore, with a simple configuration, the tightening means can be moved continuously at high speed along the guide member and stopped at a predetermined position for positioning, so the tightening work can be performed without being affected by the spacing between the fastening parts. A screw member fastening device with a wide range of applications can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the device of the present invention, FIG. 2 is a sectional view taken along line a in FIG. 1, and FIG.
1 is a sectional view taken along the line -b in FIG. 1, FIG. 4 is a view showing the head positioning means of the device shown in FIG. 1, and FIG. 6 is a diagram showing another embodiment of the device of the present invention, FIG. 7 is a diagram showing still another embodiment of the device of the present invention, and FIGS. 8 and 9 are diagrams showing the conventional device. It is a figure which shows typically the fastening operation by the screw member fastening device. DESCRIPTION OF SYMBOLS 1... Power unit, 2... Engine mount rear, 3... Tightening means, 4... Engine, 5
... Transmission, 6, 7 ... Suspension member, 11 ... Frame, 13a ... Vertical member, 13b ... Horizontal member, 13c, 13d ... Upright member, 15 ... Rolling linear motion guide rail, 17
... Guide recess, 19 ... Head, 21 ... Moving means, 23 ... Lifting means, 25 ... Connecting rod, 27 ... Lifting table, 29a ... Guide sleeve, 29b ... Guide rod, 31 ... Installation Bracket, 33...Supporting member, 35...Nut supply means, 37, 38...Tightening means, 39
...Grooved rail, 41...Dog, 43...Limit switch, 45...Positioning plate, 4
7... Fitting chip, 49... Push-up means, 51...
...Control means, 53...Sensing unit, 55...Table, 57, 58a...Mounting bracket, 5
8b... Guide member, a to e'... Fastening part, B...
...Vehicle body.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A screw member fastening device for assembling multiple types of large parts to a vehicle body, which extends in a predetermined direction corresponding to the arrangement direction of a plurality of fastening positions that differ depending on the types of parts. a guide member 15 disposed on the guide member; a tightening means 37 slidably supported by the guide member; and a tightening means 37 slidably supported by the guide member, the tightening means being slid along the guide member to select one of the plurality of fastening positions. a cylinder-driven moving means 21 that stops at a position corresponding to the location; and controlling the operation of the tightening means;
a control means 51 that controls the operation of the moving means according to the type of the parts to be assembled; a positioning member 45 having a fitting portion; a fitting member 47 that can fit into one of the plurality of fitting portions; and a fitting member 47 that is operated under the control of the control means 51.
A screw member fastening device comprising: a pushing-up means 49 for fitting the fitting member into one of the plurality of fitting portions. 2. Utility model registration claim 1, characterized in that the guide member 15 is arranged to extend obliquely with respect to a horizontal plane at an angle corresponding to the arrangement direction of the plurality of fastening positions. The described screw member fastening device.