JP2013154413A - Sprocket unit assembly equipment and assembling method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide compact sprocket assembly equipment having a small floor area.SOLUTION: Sprocket unit assembly equipment 30 includes principal elements of: a work table 31; six flange support bases 32L, 32R that are disposed at a prescribed pitch on the work table 31 and support of flanges; a worker's area 35 where a work floor 34 at which a worker 33 stands is provided, which is assigned to one area out of three equally divided areas around the circumference of the work table 31; and first and second automated machine areas 36, 37 assigned to the two remaining divided areas respectively where a variety of automated machines related to assembly are installed. Six to seven steps are performed while the work table is rotated twice. The sprocket unit assembly equipment is compactly collected, and thus the sprocket assembly equipment of a small size having a small floor area is provided.

Description

  The present invention relates to a technique for assembling a sprocket unit attached to a drive wheel of a vehicle.

  In many small vehicles, driving force is transmitted from a driving source to driving wheels using a tune and a sprocket. In this case, the sprocket is fixed to the drive wheel with bolts and nuts. A bearing is incorporated on the drive wheel side so that the drive wheel is rotatably supported on the non-rotating axle.

  The drive wheel is made by fitting a rubber tire to a wheel (spoke wheel or cast wheel). Sprockets, bolts, bearings, etc. may be set directly on the wheel, but considering speed of work, the sprocket unit, bolts, bearings are set (preset) on the disc-shaped flange, and the sprocket unit is assembled. A method of attaching the sprocket unit to the wheel is preferred.

  As for the sprocket unit assembly work, fully automatic assembly is ideal, but fully automatic is not suitable for multi-volume production. Therefore, in recent years, an assembly method in which assembly by workers and assembly by an automatic machine are mixed has been proposed and put into practical use (for example, see Patent Document 1 (FIG. 3)).

Patent document 1 is demonstrated based on the following figure.
FIG. 7 is a diagram for explaining the basic configuration of the prior art. A work station 102 on which a worker 101 works is provided with a loop-shaped rail 103, and an apparatus station provided with an automatic machine 104 along the rail 103. 105 is provided. Then, the carriage 106 on which the workpiece is placed circulates between the work station 102 and the apparatus station 105 along the rail 103.

During this time, assembly by an operator and assembly by an automatic machine are performed alternately.
That is, since the carriage 106 circulates between the work station 102 and the apparatus station 105, the apparatus station 105 is inactive when the operation station 102 is in operation, and the operation station 102 is inactive when the apparatus station 105 is in operation. Thus, productivity is remarkably lowered.

  In order to increase productivity, it is necessary to provide a plurality of FIGS. As a result, the size of the sprocket unit assembly facility is increased, the facility cost is increased, and the floor area for installation is increased.

Or although a sprocket unit assembly operation is mentioned later for details, it is implemented in 6-7 processes. If two processes are processed in FIG. 7, a sprocket unit assembly facility in which three of FIG. 7 are arranged is required.
Also in this case, since the sprocket unit assembly facility is enlarged, the facility cost increases and the floor area for installation increases.

Such a large sprocket assembly facility with a large floor area is not suitable for low-volume production.
A small sprocket assembly facility with a small floor area is desired.

JP2011-152615A

  It is an object of the present invention to provide a sprocket assembly facility that is small and has a small floor area.

The invention according to claim 1 is a disk-shaped flange, a bearing built in the flange, a plurality of both screw bolts that are screwed into one side of the flange and extend parallel to the central axis of the bearing, An assembly facility for assembling a sprocket unit comprising a sprocket having a bolt hole through which both the screw bolts pass and which is applied to one side of the flange, and a nut screwed into the both screw bolts for fixing the sprocket,
A rotation mechanism that rotates the vertical axis by 120 °,
A work table attached to the upper end of the vertical shaft;
6 flange support bases arranged on the work table at a predetermined pitch and supporting the flange;
An area around the work table is divided into three equal parts, a worker area assigned to one of which is provided with a work floor on which the worker stands;
It consists of a first automatic machine area and a second automatic machine area where various automatic machines related to assembly are provided and assigned to the remaining two, and the work table is the worker area, the first automatic machine area, the first automatic machine area, and the second automatic machine area. 2 It is rotated in one direction by the rotating mechanism so that it goes around in the order of the automatic machine area,
Of the six flange support bases, three are left flange support bases that sequentially reach the vicinity of the left hand of the worker standing on the work floor when rotated by the rotation mechanism, and the remaining three are the rotation mechanism. It is a right flange support base that reaches the vicinity of the right hand of the worker standing on the work floor when it is rotated,
In the first automatic machine area, a press-fitting machine that press-fits the bearing into the flange and a second nut runner that temporarily tightens the nut into the flange are arranged in this order along the rotation direction,
In the second automatic machine area, a first nut runner for final fastening of the screw bolts and a third nut runner for final fastening of the nut are arranged in this order along the rotation direction. To do.

The invention according to claim 2 is a sprocket unit assembly method implemented using the sprocket unit assembly facility according to claim 1,
A flange setting step in which the flange is placed on the left flange support by the worker and the screw bolts are temporarily fixed to the flange;
A bearing press-fitting step of press-fitting a bearing with the press-fitting machine into the flange that is rotated 120 ° and reaches the first automatic machine area;
A bolt tightening step in which the work table is rotated by 120 ° and the both screw bolts in the flange reaching the second automatic machine area are tightened to the flange by the first nut runner;
The work table is rotated 120 °, the flange that has reached the worker area is moved to the right flange support by the worker, and the sprocket is set on the moved flange by the worker. A set process;
A nut temporary tightening step of temporarily tightening the nut with the second nut runner to the both screw bolts in the flange that is rotated 120 ° and reaches the first automatic machine area;
A nut final tightening step of completing a sprocket unit by final tightening the nut that has reached the second automatic machine area by the third nut runner after the work table has been rotated 120 °,
A unit payout step in which the work table is turned by 120 ° and the sprocket unit reaching the worker area is paid out by the worker;
The process group is sequentially performed while the work table is rotated twice.

In the invention according to claim 3, in the worker area, the flange setting process, the sprocket setting process, and the unit payout process are collectively performed,
In the first automatic machine area, the bearing press-fitting process and the nut temporary tightening process are performed in parallel.
In the second automatic machine area, the bolt tightening process and the nut final tightening process are performed in parallel.

In the invention according to claim 1, the sprocket unit assembly equipment includes a work table, a rotating mechanism for rotating the work table by 120 °, a worker area and first and second automatic machine areas arranged around the work table, Consists of. Steps 6-7 are performed while the work table is rotated twice.
The sprocket unit assembly facility is compactly assembled, and a small sprocket assembly facility with a small floor area is provided.

  In the invention which concerns on Claim 2, the process of 6-7 is implemented sequentially while rotating a work table twice, and productivity is raised.

  In the invention according to claim 3, a plurality of operations are performed simultaneously in the worker area and the first and second automatic machine areas. The operating rate of the automatic machine becomes extremely high, and the production efficiency can be further increased.

It is a flowchart explaining the assembly procedure of a sprocket unit. It is a top view of the sprocket unit assembly equipment which concerns on this invention. It is a side view of the sprocket unit assembly equipment concerning the present invention. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a figure explaining the sprocket unit assembly method which concerns on this invention. It is a figure explaining the sprocket unit assembly method which concerns on this invention. It is a figure explaining the basic composition of the conventional technology.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

Before explaining the configuration of the sprocket unit assembly facility, the procedure for assembling the sprocket unit, which is an assembly object, will be described with reference to FIG.
As shown in FIG. 1 (a), a disk-shaped flange 11 is provided with bearing holes 12 and female screws 13 (in this example, five locations).

Both screw bolts 14 also called stats are prepared. Both screw bolts 14 include a screwless portion 15 on which a fastening tool is applied, a male screw portion 16 provided on one side of the screwless portion 15, and a male screw portion 17 provided on the other side of the screwless portion 15.
Both screw bolts 14 are temporarily tightened by lightly screwing the male screw portion 16 into the female screw 13 on the flange 11 side. This temporary fastening can be performed manually. An adhesive is applied from the adhesive container 18 as necessary.

Next, in (b), the bearing 21 and the oil seal 22 are press-fitted into the bearing hole 12. This press-fitting is performed by a press-fitting machine such as a press machine.
Next, in (c), the male threaded portion 16 of both screw bolts 14 is fully screwed into the flange 11 until a predetermined tightening torque is generated. This operation is called final tightening and is performed by the nutrunner.

  Next, in (d), a sprocket 24 having a bolt hole 23 is prepared. Then, the sprocket 24 is placed on the upper surface of the flange 11 so that the finally tightened screw bolts 14 penetrate the bolt holes 23.

Next, as shown in (e), the nut 25 is prepared, and the nut 25 is temporarily tightened to the male threaded portion 17 of the both screw bolts 14. This temporary tightening operation is performed with a nutrunner.
Next, as shown in (f), the nut 25 is finally tightened to the male screw portion 17 with a predetermined tightening torque. This final tightening work is carried out with a nutrunner.
Thus, the sprocket unit 10 as shown in (g) is completed.

A suitable facility for carrying out the above operation will be described next.
As shown in FIG. 2, the sprocket unit assembly facility 30 moves the work table 31 in 120 ° steps (in this example) around a round or polygonal work table 31 (in this example, a hexagon) and a vertical shaft 46. Rotating mechanism for rotating counterclockwise (FIG. 3, reference numeral 45), six flange support bases 32L and 32R arranged on the work table 31 at a predetermined pitch and supporting the flanges, The area is divided into three equal parts, a worker area 35 provided with a work floor 34 assigned to one of them and a worker 33 standing on, and a first automatic machine provided with various automatic machines assigned to the remaining two for assembly. The machine area 36 and the second automatic machine area 37 are the main elements.

  Among the six flange support bases, three are left flange support bases that sequentially reach the vicinity of the left hand 38L (L is a subscript indicating the left; the same applies hereinafter) of the worker 33 standing on the work floor 34 when rotated by the rotating mechanism. The remaining three are the right flange support base 32R that sequentially reaches the vicinity of the right hand 38R of the worker 33 (R is a subscript indicating the right; the same applies hereinafter).

In the first automatic machine area 36, a press-fitting machine 39 for press-fitting a bearing and an oil seal into the flange and a second nut runner 42 for temporarily tightening the nut are arranged in this order along the rotation direction.
In the second automatic machine area 37, a first nut runner 41 that finally tightens both screw bolts and a third nut runner 43 that finally tightens the nut are arranged in this order along the rotation direction.

  As shown in FIG. 3, the 1st-3rd nut runners 41-43 are attached to the support | pillar 44 so that raising / lowering is possible, and implement a predetermined | prescribed fastening operation | work. In addition, the work table 31 is supported by the vertical shaft 46 of the rotation mechanism 45 and rotates horizontally. An operation panel 47 is provided on the work floor 34. When the worker 33 presses the button 48 of the operation panel 47, the work table 31 rotates 120 ° and stops. That is, the work table 31 is manually started and automatically stopped.

  As shown in FIG. 4, the press-fitting machine 39 includes a stand 49 and a pusher 51 attached downward to the stand 49. The pusher 51 is preferably a hydraulic cylinder or a pneumatic cylinder that generates a predetermined axial force.

As shown in FIG. 2, the first automatic machine area 36 and the second automatic machine area 37 are surrounded by a safety measure 50.
A bolt stocker 52 in which both screw bolts 14 are arranged is arranged on the left side of the worker 33 and a conveyor 53 for supplying the flange 11 is provided.

  A sprocket stocker 54 on which the sprockets 24 are arranged is arranged on the right side of the worker 33, and a conveyor 55 for delivering the completed sprocket unit 10 is provided.

Conveyors 56 and 57 that supply the bearing 21 and the oil seal 22 from outside the fence so as to penetrate the safety fence 50 are extended to the first automatic machine area 36, and the conveyor 58 that supplies the nut 25 is the first automatic machine. It is extended to the area 36.
Furthermore, a component transport robot 61 is provided in the first automatic machine area 36, and the component transport robot 61 selectively moves the bearing 21, oil seal 22, and nut 25 from the conveyors 56, 57, and 58 onto the work table 31. Move.

The operation of the sprocket unit assembly facility 30 described above will be described next.
As illustrated in FIG. 5A, the flange 11 is placed on the left flange support base 32 </ b> L by the operator 33. Then, both screw bolts 14 are temporarily fixed (hand-tightened) to the flange 11 (flange setting step). In addition, the black dot (*) attached | subjected to the work table 31 is a mark for making the following understanding easy.

  When the work table 31 is rotated 120 °, the flange 11 moves to the first automatic machine area 36 as shown in FIG. A bearing 21 and an oil seal 22 are placed on the flange 11 by a component transport robot 61 and press-fitted by a press-fitting machine 39 (bearing press-fitting process).

  When the work table 31 is turned 120 °, the flange 11 moves to the second automatic machine area 37 as shown in FIG. Both screw bolts in the flange 11 are tightened (finally tightened) by the first nut runner 41 (bolt tightening step).

When the work table 31 is rotated 120 °, the flange 11 returns to the worker area 35 as shown in FIG. The worker 33 moves the flange 11 to the right flange support base 32R (arrow (1)).
The sprocket 24 is set with the right hand 38R to the flange 11B that has been moved (in order to distinguish, the flange after being moved from left to right is denoted as 11B) (sprocket setting step).

  When the work table 31 is rotated by 120 °, the flange 11B moves to the first automatic machine area 36 as shown in (e). The nut 25 is placed on both screw bolts in the flange 11 by the component transport robot 61, and temporarily tightened by the second nut runner 42 (nut temporary tightening step).

When the work table 31 is rotated by 120 °, the flange 11B moves to the second automatic machine area 37 as shown in (f). The nut is finally tightened by the third nut runner 43 (nut final tightening step).
When the work table 31 is rotated 120 °, the sprocket unit 10 reaches the worker area 35 as shown in (g). The worker 33 pays out the sprocket unit 10 to the conveyor 55 (unit payout process).
That is, seven process groups are sequentially performed while the work table 31 is rotated twice.

  As shown in FIG. 2, the sprocket unit assembly facility 30 for performing the above assembling work is compactly assembled. That is, the present invention provides a sprocket unit assembly facility 30 that is small and has a small floor area.

In FIG. 5, in order to simplify the assembling operation, only one flange 11 is traced. In an actual assembly work, the work is performed with 5 to 6 flanges 11 constantly mounted on the work table 31.
That is, as shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C, the worker puts the flanges 11 on the left flange support base 32 </ b> L that arrives sequentially.

In FIG. 6D, the worker moves the flange 11 being assembled from the left flange support base 32L to the right flange support base 32R (arrow (2)). The transferred flange has the code 11B. A new flange 11 is placed on the empty left flange support base 32L.
Thereafter, in FIGS. 6 (e), 6 (f), and 6 (g), the worker moved the flange 11 being assembled from the left flange support base 32L to the right flange support base 32R (arrow (2)) and became empty. The operation of placing a new flange 11 on the left flange support base 32L is repeated.

After (g), the form of (g) is repeated. That is, it can be said that (a) to (f) are introduction forms, and (g) is a steady form.
In (g), in the worker area 35, the flange setting process (FIG. 5 (a)), the sprocket setting process (FIG. 5 (d)), and the unit paying-out process (FIG. 5 (g)) are performed in a lump. Is done.

In the first automatic machine area 36, the bearing press-fitting process (FIG. 5B) and the nut temporary tightening process (FIG. 5E) are performed in parallel.
In the second automatic machine area 37, the bolt tightening process (FIG. 5C) and the nut final tightening process (FIG. 5F) are performed in parallel.

  In the worker area 35 and the first and second automatic machine areas 36 and 37, a plurality of operations are performed simultaneously in parallel. The operating rate of the automatic machine becomes extremely high, and the production efficiency can be further increased.

  The present invention is suitable for the assembly technology of a sprocket unit set on a driving wheel of a motorcycle or the like.

  DESCRIPTION OF SYMBOLS 10 ... Sprocket unit, 11 ... Flange, 14 ... Double screw bolt, 21 ... Bearing, 22 ... Oil seal, 23 ... Bolt hole, 24 ... Sprocket, 25 ... Nut, 30 ... Sprocket unit assembly equipment, 31 ... Work table, 32L 32R ... Flange support stand 33 ... Worker 34 ... Work floor 35 ... Worker area 36 ... First automatic machine area 37 ... Second automatic machine area 38L ... Worker's left hand, 38R ... Worker , 39 ... press fitting machine, 41 ... first nut runner, 42 ... second nut runner, 43 ... third nut runner, 45 ... rotating mechanism, 46 ... vertical axis, 61 ... parts transport robot.

Claims (3)

A disk-shaped flange, a bearing built in the flange, a plurality of double screw bolts that are screwed into one side surface of the flange and extend parallel to the central axis of the bearing, and bolts through which these screw bolts pass Assembly equipment for assembling a sprocket unit comprising a sprocket having a hole applied to one side of the flange and a nut screwed into the both screw bolts to fix the sprocket;
A rotation mechanism that rotates the vertical axis by 120 °,
A work table attached to the upper end of the vertical shaft;
6 flange support bases arranged on the work table at a predetermined pitch and supporting the flange;
An area around the work table is divided into three equal parts, a worker area assigned to one of which is provided with a work floor on which the worker stands;
It consists of a first automatic machine area and a second automatic machine area where various automatic machines related to assembly are provided and assigned to the remaining two, and the work table is the worker area, the first automatic machine area, the first automatic machine area, and the second automatic machine area. 2 It is rotated in one direction by the rotating mechanism so that it goes around in the order of the automatic machine area,
Of the six flange support bases, three are left flange support bases that sequentially reach the vicinity of the left hand of the worker standing on the work floor when rotated by the rotation mechanism, and the remaining three are the rotation mechanism. It is a right flange support base that reaches the vicinity of the right hand of the worker standing on the work floor when it is rotated,
In the first automatic machine area, a press-fitting machine that press-fits the bearing into the flange and a second nut runner that temporarily tightens the nut into the flange are arranged in this order along the rotation direction,
In the second automatic machine area, a first nut runner for final fastening of the screw bolts and a third nut runner for final fastening of the nut are arranged in this order along the rotation direction. Sprocket unit assembly equipment. In the sprocket unit assembly method implemented using the sprocket unit assembly facility according to claim 1,
A flange setting step in which the flange is placed on the left flange support by the worker and the screw bolts are temporarily fixed to the flange;
A bearing press-fitting step of press-fitting a bearing with the press-fitting machine into the flange that is rotated 120 ° and reaches the first automatic machine area;
A bolt tightening step in which the work table is rotated by 120 ° and the both screw bolts in the flange reaching the second automatic machine area are tightened to the flange by the first nut runner;
The work table is rotated 120 °, the flange that has reached the worker area is moved to the right flange support by the worker, and the sprocket is set on the moved flange by the worker. A set process;
A nut temporary tightening step of temporarily tightening the nut with the second nut runner to the both screw bolts in the flange that is rotated 120 ° and reaches the first automatic machine area;
A nut final tightening step of completing a sprocket unit by final tightening the nut that has reached the second automatic machine area by the third nut runner after the work table has been rotated 120 °,
A unit payout step in which the work table is turned by 120 ° and the sprocket unit reaching the worker area is paid out by the worker;
A method of assembling a sprocket unit, wherein the process group is sequentially performed while the work table is rotated twice. In the worker area, the flange setting process, the sprocket setting process, and the unit payout process are collectively performed,
In the first automatic machine area, the bearing press-fitting step and the nut temporary tightening step are performed in parallel,
The sprocket unit assembling method according to claim 2, wherein the bolt tightening step and the nut final tightening step are performed in parallel in the second automatic machine area.

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