JP3449689B2 - Positioning method for heavy load pallets - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for positioning a pallet on which a heavy object such as an engine is placed. 2. Description of the Related Art In a vehicle assembly line, an engine is mounted on a vehicle body, and an engine pallet is used for this mounting. More specifically, for example, as shown in FIG. 2 of Japanese Patent Application Laid-Open No.
Is hung with a hanger 5, and the engine unit 3 placed on a pallet 17 faces the vehicle body 1. Synchronizing the vehicle body 1 with the engine unit 3 by inserting the positioning pin 9 at the upper end of the lifter 4 raised from the side base (described in FIG. 3) supporting the pallet 17 into the hanger 5 side. It is characterized by taking. In FIG. 3 of the publication, a connecting pin 25 is attached to the side base 13, and the connecting pin 25 is engaged with the pallet 17 to determine the position of the pallet 17 with respect to the side base 13. Therefore, the connecting pin 25
Can be said to be important components for positioning the engine unit 3 on the vehicle body 1 together with the positioning pins 9. Details of the connecting pin 25 will be described below. FIG. 7 is an explanatory view of a conventional connecting pin for an engine pallet. A connecting pin mechanism 110 in which a plurality of rollers 101, 101 stand by under an engine pallet 102 that moves horizontally is movable right and left in the drawing. A bracket 113 attached to a small side base 112, a cylinder unit 114 attached to a lower portion of the bracket 113,
A guide cylinder 115 mounted on the upper part, and the guide cylinder 115
And a connecting pin 116 inserted so as to be able to move up and down. The connecting pin 116 can be moved up and down by the action of the piston rod 117 of the cylinder unit 114. FIG. 8 is an operation diagram of FIG. 7. When the engine pallet 102 reaches a predetermined position, a connecting pin 116 is inserted into a positioning hole 119 of the engine pallet 102, and
The engine pallet 102 is fixed to the side base 112 side. An engine (not shown) is mounted on the engine pallet 102. Since the engine is mounted on the specified position of the engine pallet 102, if the engine pallet 102 is aligned with the vehicle body, the engine can be correctly mounted on the vehicle body. . [0006] By the way, the engine is bolted to the vehicle body via the mount rubber and the mount bolt, but the mount rubber and the mount bolt are slightly inclined with respect to the original posture. There is. It is necessary to mount the engine on the vehicle body side in accordance with the inclination tendency of the mount rubber or the like, that is, at the final stage of mounting the engine, it is necessary to position the engine based on the vehicle body. However, as shown in FIG. 8, since the connecting pins 116 are closely fitted in the positioning holes 119, the engine pallet 102 cannot be finely adjusted by laterally moving. This is because if the connecting pin 116 is pulled out from the positioning hole 119, the engine pallet 102 moves sideways, which hinders the assembling work. SUMMARY OF THE INVENTION An object of the present invention is to provide a method of positioning an engine pallet in which the lateral movement of the engine pallet is restricted and an allowance for adjusting the mounting of the engine can be expected. [0009] In order to achieve the above object, a pallet (1 ) on which a heavy object (52) is placed is provided.
7) A positioning hole (43) is opened in the positioning hole (4).
In order to position the pallet (17 ) by fitting the connecting pin (25) into the gantry (20) side into the 3) , the connecting pin (25) has a slightly smaller diameter than the diameter of the positioning hole (43). Reference diameter portion (45) and the reference diameter portion (45)
A multi-stage pin having a sufficiently small diameter portion (46) ;
And a connecting step (25) for controlling such a connecting pin (25).
By controlling the position in (36) , the reference hole (43) is inserted into the positioning hole (43) until the start of the assembling work on the coupled part (51).
Lateral movement restricting step and, coupled parts by weight product (52) for regulating the lateral movement of (45) to face the by pallet (17) (5
In the assembly work stage for fixing to 1), positioning holes (43)
Wherein the lateral movement permitting step to face the small-diameter portion (46) to some extent allowed (17) lateral movement of the pallet, in that it consists of a. At the stage of assembling a heavy object such as an engine, a small-diameter portion is made to face the positioning hole to allow the pallet to move to a certain extent, so that the engine can be mounted according to the inclination of the engine mount or the engine bolt, for example. It became. Since the pallet is regulated by the small diameter part,
It does not move so much that it causes harm. Therefore,
Adjustment allowance for mounting a heavy object can be anticipated while restricting lateral movement of the pallet, and the efficiency of the mounting operation of the heavy object can be improved. Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. Hereinafter, "heavy load" is the engine, "heavy load pallet" is the engine pallet, "joined part" is the vehicle body,
The “mount” will be described using a side base as an example, but the heavy object is not limited to the engine, the engaged portion is not limited to the vehicle body, and the mount is not limited to the side base. FIG. 1 is a plan view of a lifter for raising and lowering an engine pallet according to the present invention. A lifter 10 is mounted on a large-diameter lifting / lowering cylinder 11 so as to be pivotable. Table frame 13 of shape
Are slidably mounted in the direction B, and a plurality of support rollers 14... (... Indicates a plurality. The same applies hereinafter) and guide rollers 15. An engine pallet 17 indicated by a line is movably supported in the direction T shown in the figure. In addition, 18 ...
Is another guide roller, and the table frame 13 is B
It is a member that guides in the direction. Although it is difficult to see it because it is hidden under the support rollers 14,...
0 is slidably mounted in the direction T, and the side base 20 is provided with nut runners 24,..., Connecting pins 25, 25, and cylinders 26, 26. FIG. 2 is a sectional view of an engine pallet positioning mechanism according to the present invention. The engine pallet positioning mechanism 30 (hereinafter simply referred to as the positioning mechanism 30).
A back plate 31 bolted to the side base 20, a lower flange 32 extending from the lower edge of the back plate 31 to the front of the drawing, a two-stage cylinder unit 33 attached upward to the lower flange 32, Cylinder unit 33
A control unit 36 for comprehensively controlling the first cylinder unit 34 and the second cylinder unit 35, an upper flange 38 extending from the upper edge of the back plate 31 toward the drawing, and an upper flange 38
, A guide metal portion 41 fitted to the guide tube 39, and a connecting pin 25 inserted into the guide tube 39 via the guide metal portion 41. In the drawing, reference numeral 42 denotes a sealing material, and 43 denotes a positioning hole. The connecting pin 25 is connected to the engine pallet 1
7, a reference diameter portion 45 having substantially the same diameter (accurately a slightly smaller diameter) as the diameter of the positioning hole 43, and a small diameter portion 46 having a sufficiently small diameter.
And a multi-stage pin which is continuous from bottom to top via a conical surface 47. Note that the height position Ll of the connecting pin 25 corresponds to a standby position. The control unit 36 controls the first cylinder unit 34 and the second
The connection pin 25 is raised by controlling the cylinder portion 35. At this time, the small diameter portion 46 first reaches the positioning hole 43. Therefore, even if the relative position is slightly shifted, the connection pin 25 can be easily moved to the positioning hole 43. Can be inserted into During the insertion, the small-diameter portion 46 is smoothly formed on the conical surface 47.
Therefore, a structure is adopted in which the connecting pin 25 can be smoothly passed through the positioning hole 43 irrespective of being a multi-stage pin. Using the positioning mechanism having the above configuration ,
The method of the present invention to be implemented is described below. FIG. 3 is an explanatory view of a first operation of the engine pallet positioning mechanism according to the present invention, showing that the reference pin 45 is fitted into the positioning hole 43 by fully lifting the connecting pin 25. The height Lh of the connecting pin 25 at this time corresponds to the upper limit height position. Since the reference diameter portion 45 is fitted in the positioning hole 43, there is no fear that the engine pallet 17 moves laterally. This form
This is applied to a process of horizontally moving the engine pallet 17 below the vehicle body. These steps are referred to as “before starting the assembly work”. FIGS. 4A and 4B are views for explaining a first operation of the lifter according to the present invention. In (a), the hanger 5
0 intermittently conveys the vehicle body 51 from a front station (not shown) of the vehicle assembly line, and the lifter 10 receives the engine unit 52 at an engine unit supply unit (not shown) beside the conveyance path, and then moves the front and rear directions of the drawing. The apparatus stands by below the hanger 50 by a conveyor (not shown) that enables the movement of the vehicle. The engine pallet 17 has engine positioning members 54 projecting therefrom, and these engine positioning members 54 position the engine unit 52. Therefore, the relative position between the engine pallet 17 and the engine unit 52 does not change. In (b), the cylinder 26 is extended, and the engaging portion 27 at the tip thereof is engaged with the positioning pin 53 at the lower end of the hanger 50. At this time, the positioning pin 53 is mechanically fitted within the range of the taper 28 of the engaging portion 27. Thus, the engine unit 52 with respect to the vehicle body 51 is mechanically connected to the vehicle body 51 → the hanger 50 → the cylinder 26 → the side base 20 → the connecting pin 25 → the engine pallet 17.
The horizontal position has been determined. Then, the connecting pin 25 is operated in the following manner. FIG. 5 is an explanatory view of a second operation of the engine pallet positioning mechanism according to the present invention, and shows that the connecting pin 25 is slightly lowered so that the small diameter portion 46 faces the positioning hole 43. As a result, a shift margin δ corresponding to a value obtained by subtracting the diameter of the small diameter portion 46 from the diameter of the positioning hole 43 and halving the value is generated. The height position of the connection pin 25 is Lm.
This embodiment is applied to an “assembly work stage” in which an engine is mounted on a vehicle body while considering the inclination of the engine mount and the like. Since the adjustment of the inclination of the engine mount does not require much adjustment allowance, the shift allowance δ is sufficient. On the other hand, it is not preferable that the engine pallet 17 is largely moved laterally even in the assembling work stage. This is because it has an adverse effect on the assembling work. In this regard,
As shown in the drawing, only δ moves at most, and the engine pallet 17 does not move laterally beyond it. Therefore, by causing the small diameter portion 46 to face the positioning hole 43, the lateral movement of the engine pallet 17 which is large enough to be problematic is restricted, and the small engine pallet 1 necessary for fine adjustment is small.
7 is allowed to move laterally, and the engine mounting operation can be performed efficiently. That is, conventionally, since the horizontal movement of the engine pallet was strongly suppressed by the connecting pin, it was difficult to perform the fine adjustment work in the final stage. In this regard, in the present invention, as described above, since there is an adjustment margin by δ, the fine adjustment work in the final stage can be performed very easily. FIG. 6 is a view for explaining the second operation of the engine mounting lifter. The elevating cylinder 11 is extended, the engine unit 52 is raised to a predetermined position on the vehicle body 51, and bolts are fixed to the vehicle body 51 by the nut runners 24. do it.
At this time, since the engine pallet 17 can be moved laterally by δ as shown in FIG. 5, it can be finely adjusted according to the inclination of the engine mount of each vehicle body 51, and the engine mounting work can be performed efficiently. Can be. Incidentally, the height position of the connecting pin 25 is represented by Ll, L
Two-stage cylinder unit 3 for three points m and Lh
Reference numeral 3 may be any of a so-called parent-child cylinder, an electric cylinder capable of multi-stage position control, and a stepping cylinder. The timing of switching from FIG. 3 to FIG. 5 may be any timing between the completion of the lateral movement operation of the engine pallet 17 and the start of bolt tightening by the nut runners 24. The timing before switching from FIG. 3 to FIG. 5 is “until the start of the assembling work” described in claim 1, and the timing after the timing is “the assembling work stage”. According to the present invention, the following effects are exhibited by the above configuration. The connecting pin is a multi-stage pin having a reference diameter part slightly smaller than the diameter of the positioning hole and a small diameter part sufficiently smaller than the reference diameter part. By controlling the position of the pallet, the diametrical portion faces the positioning hole and restricts lateral movement of the pallet until assembly work on the part to be joined starts, and the small diameter portion faces the positioning hole during the assembly work stage. The lateral movement of the pallet is allowed to some extent. At the stage of assembling a heavy object such as an engine, the small-diameter portion faces the positioning hole to allow the pallet to move to a certain extent. It became. Since the pallet is regulated by the small diameter part,
It does not move so much that it causes harm. Therefore,
It is possible to allow for a margin for adjusting the attachment of a heavy object while restricting the lateral movement of the pallet, thereby improving the efficiency of the operation of attaching the heavy object.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a lifter that lifts and lowers an engine pallet according to the present invention. FIG. 2 is a cross-sectional view of a positioning mechanism of the engine pallet according to the present invention. FIG. FIG. 4 is a diagram illustrating a first operation of the lifter according to the present invention. FIG. 5 is a diagram illustrating a second operation of the engine pallet positioning mechanism according to the present invention. FIG. FIG. 7 is an explanatory view of a conventional connecting pin for an engine pallet. FIG. 8 is an operational view of FIG. 7. [Description of symbols] 10 ... lifter, 17 ... a pallet or pallet for loading heavy objects (engine pallet) ), 20: gantry (side base), 25: connecting pin, 30: positioning mechanism for heavy load pallet (positioning mechanism for engine pallet), 33
... two-stage cylinder unit, 36 ... control part, 43 ... positioning hole, 45 ... reference diameter part, 46 ... small diameter part, 51 ... engaged part (vehicle body), 52 ... heavy object (engine unit), δ ...
Adjustment fee.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 65/10 B23Q 3/18 B62D 65/18 F16M 3/00

Claims (1)

(57) Claims 1. A pallet (1 ) on which a heavy object (52) is placed
7) A positioning hole (43) is opened in the positioning hole (4).
3) By fitting the connecting pin (25) from the gantry (20) side, for positioning of said pallet (17)
In addition, a reference diameter part (45) having the connecting pin (25) slightly smaller than the diameter of the positioning hole (43) and a small diameter part (46) having a diameter sufficiently smaller than the reference diameter part (45). By providing a multi-pin preparation step and controlling the position of such a connecting pin (25) by the control section (36) , the positioning pin (43) remains in the positioning hole (43) until the start of the assembling work on the coupled section (51) side. Lateral movement restricting step of restricting lateral movement of the pallet (17 ) with the reference diameter part (45) facing.
And fixing the heavy object (52) to the part to be joined (51) In the assembling work stage, the small-diameter part (46) faces the positioning hole (43) , and the pallet (17) allows a certain amount of lateral movement.
Heavy placed pallet positioning method, wherein the dynamic allowable step, in that it consists of.