JP2004001940A - Heavy-parts loading device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact heavy-parts loading device capable of certainly stopping a heavy part at a predetermined height position. <P>SOLUTION: A pallet 13 previously set with an engine assembly is placed on a placement table 40 of the heavy-parts loading device 10. Then, a motor 21 is driven, a nut member 51 is rotated and a screw shaft 52 is ascended. The placement table 40 is ascended accompanying with ascending of the screw shaft 52 and force is applied to a car body 3 from below by the engine assembly 11. Since the car body 3 is fixed to a floor by a chain 4 such that it is not lifted from a hanger 2, a motor 21 is driven to realize the 1G state. The motor 21 is stopped at the time of this state and a mounting work is carried out by a nut runner 16 while the height position (1G state) is maintained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heavy component mounting apparatus that lifts a heavy component such as an engine assembly or a suspension assembly to a position where the component can be mounted on an assembly line of an automobile, for example.
[0002]
[Prior art]
Japanese Patent Publication No. 3-73404 discloses a device for lifting heavy parts such as an engine assembly from below to a mounting position in order to assemble heavy parts such as an engine assembly to a vehicle body conveyed along a line. Devices are known.
[0003]
In this device, a guide rail is provided inside a fixed pillar in the vertical direction, the guide pillar is slidably fitted to the guide rail, and a horizontally movable mounting table is connected to the upper end of the guide pillar, The guide column and the mounting table are moved up and down by driving the cylinder unit in the vertical direction.
In particular, in the device disclosed in this prior art, after the engine assembly has been raised to the assembly position, the engine body is further raised by the cylinder unit to slightly raise the vehicle body, thereby causing the vehicle body to shift vertically. In addition, the position deviation based on the inclined posture is corrected.
[0004]
[Problems to be solved by the invention]
In the device disclosed in Japanese Patent Publication No. 3-73404, since the cylinder unit is moved up and down, fine adjustment is difficult and the engine assembly cannot be stopped at an accurate height position.
[0005]
Therefore, it is conceivable to use a mechanism in which the screw shaft or the nut is linearly moved by screwing the screw shaft and the nut via a steel ball, and rotating the nut while preventing the rotation of the screw shaft.
With such a mechanism, fine adjustment of the height position is easy, but when assembling an engine assembly or the like, it is necessary to be fixed at a predetermined height and maintain that position.
[0006]
Further, when the above mechanism is employed in a heavy component mounting apparatus, the entire apparatus becomes large unless the arrangement of a member for preventing rotation of the screw shaft, a guide member of the screw shaft, and the like is devised.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a heavy component mounting device according to the present invention has a nut member rotated by a motor and prevented from moving in a vertical direction, and is screwed to the nut member and prevented from rotating. A stopper member that includes a screw shaft and a heavy component mounting table provided at an upper end of the screw shaft, wherein the nut member is integrally provided with a gear, and meshes with the gear to prevent rotation of the nut member. Are arranged to be able to advance and retreat with respect to the gear.
[0008]
Further, in the present invention, the nut member and the screw shaft are arranged in a telescopic cover member, and the cover member is constituted by a plurality of square tubes concentrically engaged via a slide and a slide guide. The structure can be simplified if the lower end of the member is non-rotatably supported by the base member and the upper end is connected to the mounting table to prevent rotation of the screw shaft.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of an assembly line of an automobile incorporating a heavy component mounting apparatus according to the present invention, and FIGS. 2A to 2C are views for explaining the operation of a positioning cylinder of the heavy component mounting apparatus according to the present invention. is there.
[0010]
In the figure, reference numeral 1 denotes a guide rail, and a self-propelled hanger 2 is engaged with the guide rail 1, and the body 3 is conveyed to a position above the heavy component mounting apparatuses 10 and 10 by the movement of the hanger 2, and at this position, the engine assembly is mounted. 11 and a rear suspension assembly 12 are mounted on the vehicle body 3.
[0011]
A front suspension is also incorporated in the engine assembly 11, and the engine assembly 11 is positioned and fixed on a pallet 13. The pallet 13 is movably mounted on a mounting table 40 at the upper end of the heavy component mounting apparatus 10 in a horizontal plane. The pallet 13 is provided with a positioning cylinder 15 and a nut runner 16. On the other hand, a pallet 13 to which the rear suspension assembly 12 is fixed is also provided with a positioning cylinder 15 and a nut runner 16.
[0012]
The operation of the positioning cylinder 15 will be described with reference to FIGS. First, when the vehicle body 3 is transported to the assembly position, the hanger 2 stops. Therefore, the vehicle body 3 is fixed to the floor side by the chain 4 to prevent the vehicle body 3 from floating from the hanger 2. In this state, the heavy component mounting device 10 is extended.
[0013]
Then, the pallet 13 rises as the weight component mounting device 10 expands. At this time, even if the axis of the pin 15a at the tip of the cylinder 15 is slightly shifted from the axis of the reference hole 3a of the vehicle body 3, if the pin 15a is slightly locked in the axis of the reference hole 3a, The pallet 13 moves horizontally so that the axis of the pallet 15a follows, and when the pallet 13 further moves up, the elastic force of the cylinder 15 is lost and the cylinder 15 contracts. Thereby, the pallet 13, that is, the engine assembly 11 or the rear suspension assembly 12 is positioned with respect to the reference of the vehicle body 3.
[0014]
Next, the structure of the heavy component mounting apparatus 10 will be described with reference to FIGS. Here, FIG. 3 is a diagram of the heavy component mounting apparatus as viewed from the front, FIG. 4 is a plan view of the heavy component mounting device as viewed from the AA direction of FIG. 3, FIG. FIG. 7 is a view showing a state in which the lock mechanism has been contracted from the state of FIG. 5, FIG. 7 is a sectional view taken along the line CC in FIG.
[0015]
The heavy component mounting apparatus 10 includes a base 20, an extendable cover member 30 having a lower end supported by the base 20, a mounting table 40 provided at an upper end of the cover member 30, and an elevating mechanism 50 for moving the mounting table 40 up and down. And a lock mechanism 60 for locking the movement of the elevating mechanism 50.
[0016]
The cover member 30 is composed of four square tubes 31 concentrically engaged with each other. The inner square tube 31 and the outer square tube 31 are slidable vertically through a slide 32 and a slide guide 33. Is engaged. The lowermost square tube 31 of the square tubes constituting the cover member 30 is fixed to the base 20, and the mounting table 40 is attached to the uppermost square tube 31.
[0017]
The mounting table 40 is provided with a support 41 that enables the pallet 13 to move horizontally. The support 41 has a frame shape, and rotatable steel balls 42 are arranged along two opposing sides of the frame.
Further, an engaging member 43 for restricting large movement of the pallet 13 is provided at the opposite corner of the support 41.
[0018]
The lifting mechanism 50 includes a nut member 51 and a screw shaft 52 that is screwed to the nut member 51 directly or via a steel ball.
The nut member 51 is supported by a receiving member 53 fixed on the base 20 via a ball bearing 54 so as to be rotatable in the horizontal direction and not to move in the vertical direction, and the motor 21 is fixed on the base 20. The timing belt 24 is stretched between the pulley 22 fixed to the shaft of the motor 21 and the pulley 23 fixed to the upper end of the nut member 51 protruding from the receiving member 53, and the nut 21 is rotated by driving the motor 21. I have to.
[0019]
The upper end of the screw shaft 52 is connected to the mounting table 40, and the mounting table 40 is connected to the uppermost rectangular tube 31 constituting the cover member 30, and the cover member 30 can be extended and contracted. Since the screw shaft 52 does not rotate, the screw shaft 52 is also prevented from rotating.
On the other hand, since the vertical movement of the screw shaft 52 is not restricted, the rotation of the nut member 51 causes the screw shaft 52 to move up and down. FIG. 5 shows a fully extended state, and FIG. 6 shows a contracted state.
[0020]
The rotation of the nut member 51 is prevented by the lock mechanism 60. The lock mechanism 60 includes a gear 61 and a stopper device 62 provided integrally at a lower end of the nut member 51.
[0021]
As shown in FIG. 8, the stopper device 62 slidably inserts the shaft 65 of the block 64 into a pair of horizontal guides 63 arranged on the base 20, and slides the shaft 65 on the base 20 toward the gear 61. By connecting a horizontally arranged cylinder 66 to the block 64, the block 64 is moved forward and backward toward the gear 61, and the forward and backward ends of this forward and backward movement are detected by limit switches 67 and 68. I have to.
[0022]
FIG. 9 is an enlarged view for explaining the movement of the engaging piece. As shown in this figure, an engaging piece 69 having teeth formed to mesh with the gear 61 is formed at the tip of the block 64 via a shaft 70. To be able to swing horizontally.
Further, springs 71, 71 are arranged between the left and right of the engaging piece 69 and the block 64, and when the engaging piece 69 moves forward, the peak of the teeth of the engaging piece 69 and the peak of the gear 61 hit. Even in this case, the engaging piece 69 escapes to the left or right so that both are securely engaged, and when no force is applied, the engaging piece 69 returns to the neutral position.
[0023]
A procedure for assembling the engine assembly 11 to the vehicle body 3 using the heavy component mounting apparatus 10 having the above configuration will be described. Note that the assembling of the rear suspension assembly 12 is the same as that of the engine assembly 11 and will not be described.
[0024]
First, the pallet 13 on which the engine assembly 11 has been set in advance is placed on the placing table 40 of the heavy component mounting apparatus 10 in a compressed state. Next, the motor 21 is driven, the nut member 51 is rotated, and the screw shaft 52 is raised.
[0025]
As the screw shaft 52 is raised, the mounting table 40 is also raised. First, the pin 15a at the tip of the positioning cylinder 15 provided on the pallet 13 is engaged with the reference hole 3a of the vehicle body 3, and the engine assembly 11 is positioned with respect to the vehicle body. Is done.
[0026]
Further, the motor 21 is driven to apply a force to the vehicle body 3 from below by the engine assembly 11. In this embodiment, since the vehicle body 3 is fixed to the floor by the chain 4 so as not to be lifted from the hanger 2, the 1G state is realized by driving the motor 21. In this state, the front suspension assembly incorporated in the engine assembly 11 has been compressed by an amount equivalent to 1G.
[0027]
As described above, the motor 21 is stopped at the time of the 1G state, and the cylinder 63 of the stopper device 62 is operated and the block 64 is shifted by the gear to perform the mounting operation while maintaining the height position (1G state). The engagement member 66 is engaged with the gear 61 to lock the nut member 51 so as not to rotate.
[0028]
In this state, the engine assembly 11 is attached to the vehicle body 3 by the nut runner 16, and when this operation is completed, the cylinder 63 is compressed to retract the engagement piece 66, and then the motor 21 is driven to reverse the nut member 51. By rotating, the pallet 13 from which the screw shaft 52, the mounting table 40 and the engine assembly 11 have been removed is lowered.
[0029]
When the screw shaft 52 is lowered to a predetermined position, the driving of the motor 21 is stopped, and the rotation of the nut member 51 is prevented by the lock mechanism 60 just in case.
[0030]
【The invention's effect】
As described above, according to the heavy component mounting apparatus according to the present invention, the heavy component mounting table is moved up and down using the ball screw mechanism including the screw shaft and the nut member. Since the rotation can be stopped and the rotation of the nut member can be reliably prevented via the gear, the assembling workability is greatly improved.
[0031]
According to the present invention, the screw shaft and the nut member are arranged in the telescopic cover member, and the screw shaft is prevented from rotating by directly or indirectly connecting the screw shaft to the cover member. As a result, the number of parts can be reduced and the entire apparatus can be made compact.
[Brief description of the drawings]
FIG. 1 is a side view of an assembly line of an automobile incorporating a heavy component mounting apparatus according to the present invention. FIGS. 2A to 2C illustrate the operation of a positioning cylinder of the heavy component mounting apparatus according to the present invention. FIG. 3 is a view of the heavy component mounting apparatus as viewed from the front. FIG. 4 is a plan view of the heavy component mounting apparatus as viewed from the AA direction of FIG. 3; FIG. FIG. 7 is a cross-sectional view taken along the line CC in FIG. 4. FIG. 8 is a plan view showing details of a lock mechanism. FIG. 9 is an enlarged view illustrating the movement of an engagement piece. Description】
DESCRIPTION OF SYMBOLS 1 ... Guide rail, 2 ... Self-propelled hanger, 3 ... Body, 3a ... Reference hole, 4 ... Chain, 10 ... Heavy parts mounting equipment, 11 ... Engine assembly, 12 ... Rear suspension assembly, 13 ... Pallet, 15 ... Positioning Cylinder, 15a: Pin, 16: Nut runner, 20: Base, 21: Motor, 22, 23: Pulley, 24: Timing belt, 30: Cover member, 31: Square tube, 32: Slide, 33: Slide guide, 40 ... Mounting table, 41 support, 42 steel ball, 43 engaging member, 50 lifting mechanism, 51 nut member, 52 screw shaft, 53 receiving member, 54 ball bearing, 60 locking mechanism, 61 ... gear, 62 ... stopper device, 63 ... guide, 64 ... block, 65 ... shaft, 66 ... cylinder, 67, 6 ... Limit switch, 69 ... Kakarigokoma, 70 ... shaft, 71 ... spring.

Claims (2)

A nut member rotated by a motor and prevented from moving in the vertical direction, a screw shaft screwed into the nut member and prevented from rotating, and a heavy part provided at the upper end of the screw shaft A heavy component mounting device comprising a mounting table, wherein the nut member is integrally provided with a gear, and a stopper member meshing with the gear to prevent rotation of the nut member is capable of moving forward and backward with respect to the gear. A weight component mounting device, which is disposed. 2. The weight component mounting apparatus according to claim 1, wherein the nut member and the screw shaft are disposed in a telescopic cover member, and the cover member engages concentrically via a slide and a slide guide. A heavy component mounting apparatus comprising a rectangular tube, wherein a lower end of the cover member is non-rotatably supported by the base member, and an upper end is connected to the placing table.

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