JPH08155567A - Production of cam shaft and device therefor - Google Patents

Abstract

PURPOSE: To provide an assembling method of a cam shaft and a device thereof, by which the whole automation of a work is easily executed without any fear of movement of the shaft at the time of assembling. CONSTITUTION: At the time of holding the upper end of the shaft 25 with a chuck 30, the centering is executed with a centering means 24 for supporting and centering the lower end of the shaft, and the chuck is descended so as to match a first cam fitting position on the outer peripheral surface of the shaft to the position of a rolling form means, and the chuck is rotated to execute the work. Successively, after ascending the chuck to the original position, the chuck is partially turned and matched to the angle position of the first cam 26a positioned to a clamper holding hole 28. Then, the chuck is descended and the cam is pressed in the first cam fitting position of the shaft and assembled and successively, the chuck is ascended to the original position. This work is repeated to assemble the cam shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a camshaft used in an automobile engine or the like. More specifically, one assembly component such as a plurality of cams manufactured separately from the shaft is used. The present invention relates to improvements in a method and an apparatus for sequentially press-fitting and assembling the shaft.

[0002]

2. Description of the Related Art A method of manufacturing an assembled camshaft in which a plurality of assembling parts such as cams, which are separate from a shaft, are sequentially assembled to a single camshaft, and the assembling parts set position on the outer peripheral surface of the shaft is raised. A method of press-fitting the assembled parts therein is known from JP-A-3-168305.

The known device comprises a chuck for gripping one end of the shaft, a clamper for holding a cam, sliding and rotating in the axial direction of the shaft, and a punch for forming a protrusion on the outer peripheral surface of the shaft. In this device, first, a punch is formed at a position where the first cam is mounted on the outer peripheral surface of the shaft to form a first protrusion having an annular protrusion on the shaft, and then the first cam is attached to the clamper, and the first clamper is attached to the first cam. The cam rotates to a predetermined angular position with respect to the shaft, and the clamper is further advanced axially toward the shaft to press the first cam from the open end side of the shaft to the first cam assembly position, and then , The first cam of the clamper is opened, the clamper is retracted in the axial direction, and the clamper is pulled out from the open end of the shaft to complete the press-fitting of the first cam. Next, a punch is used to form a second protrusion on the outer peripheral surface of the shaft at the second cam mounting position, and the second cam is mounted on the clamper. As with the first cam, the second cam piece is mounted on the shaft by the second cam mounting. Press into position. In this way, a predetermined number of cams are pressed into one shaft.

[0004]

The above method is a method in which a ridge is formed on the outer peripheral surface in a state where the shaft is supported only at one end and the cam piece is fitted into the shaft from the open end on the opposite side. Since the shaft is not centered when it is gripped, the shaft may eccentrically swing around. Further, since the punch for raising the outer peripheral surface of the shaft is moved in the axial direction without moving the chuck in the axial direction,
There is a problem that the time required for assembly becomes long.

The present invention has been made to solve this problem, and an object of the present invention is to eliminate the possibility of eccentricity of the shaft and to shorten the time required for assembling the camshaft. And to provide a device.

[0006]

In order to achieve the above object, the means adopted by the method of the present invention is such that the chuck holding the upper end of the shaft is lowered to match the cam mounting position with the processing means of the outer peripheral surface of the cam. Step, rotating the chuck, moving the processing means in the horizontal direction to process the outer peripheral surface at the cam assembly position, then returning the chuck and the processing means to their original positions, and rotating the chuck partially. By repeating the step of aligning the shaft with the angular position of the cam held by the cam holding means arranged at the press-fitting position below the processing means and the step of lowering the chuck to press-fit the cam assembly position of the shaft into the cam In a method of manufacturing a shaft, when the upper end of the shaft is gripped by a chuck, the lower end of the shaft is pushed by a center means to perform centering, and two pieces are attached to the cam holding means. By holding the arm in that to arrange the press-fitting position of the cam to hold alternately.

Further, the means adopted by the device of the present invention include a shaft press-fitting means having a chuck for removably gripping one end of the shaft to rotate and move up and down, and a radial direction with respect to the shaft gripped by the chuck. Processing means for moving in and out of the shaft and applying rolling means such as knurls to the outer peripheral surface of the shaft,
In a camshaft manufacturing apparatus that is coaxial with the chuck, but includes a cam holding unit that detachably holds a cam below the processing unit, presses the lower end when the chuck holds the upper end of the shaft. There is provided a center means for performing centering and a slide table that reciprocates in a direction orthogonal to the axis of the shaft is provided as a cam holding means, and the two cams are held on the slide table.

[0008]

When the chuck grips the upper end of the shaft, the center means axially presses the lower end of the shaft to center the shaft. Then, the shaft hole of the first cam held by the slide table is arranged coaxially with the chuck. Next, the chuck is lowered to align the first cam mounting position from the upper end side with the processing position of the processing means, and then the processing means is moved in the radial direction with respect to the shaft center of the shaft to move the first outer surface of the shaft to the first position. After engaging with the cam mounting position, the chuck is rotated to machine the outer peripheral surface of the shaft first cam mounting position such as knurling. After processing, the processing means and the chuck are returned to their original positions. Then, the chuck is partially rotated to match the angular position of the first cam, and then the chuck is moved in the axial direction so that the machined first cam assembly position is press-fitted into the shaft hole of the first cam to make the first cam position. The first cam is fitted to.

Then, the chuck is lifted and the shaft hole of the second cam for moving and holding the slide table is arranged coaxially with the shaft. Next, the chuck is lowered to align the second cam assembly position with the processing position of the processing means. Similarly to the first cam, the second cam is press-fitted and fitted into the second cam mounting position of the shaft. Similarly, a predetermined number of cams are press-fitted onto the shaft to assemble the cam shaft.

The assembled cam shaft is removed from the chuck, and a new shaft is gripped by the chuck. This work involves feeding a new shaft, a camshaft conveyor that receives the camshaft, and a shaft on the shaft conveyor that grips the shaft and carries it to the chuck.
The robot can be automated by providing a shaft robot hand that causes the chuck to grip the upper end of the shaft and a camshaft robot hand that receives the camshaft released by the chuck and transfers the camshaft to the camshaft conveyor.

To hold the cam on the slide table, a slide table having two clamper holding holes, a cam conveyor for supplying the cam, a predetermined cam taken out from the cam conveyor, and the empty clamper grips the cam. Automation can be achieved by providing a cam robot hand and a clamper robot hand that fits the clamper holding the cam into an empty clamper holding hole at a position other than the press-fitting position coaxial with the shaft of the table.

As described above, since the shaft is centered and attached to the chuck, there is no possibility of eccentricity of the shaft, and the processing means only moves in the direction orthogonal to the shaft. Therefore, the time required for processing is shortened and the assembly is improved. It is possible to fully automate the work required for.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in the drawings. As shown in the plan view of FIG. 1, the shaft conveyor 11 is arranged on the front right side of the frame 32 of the shaft press-fitting means 10 and the camshaft conveyor 12 is arranged on the front left side thereof, and is inclined so as to open forward from the shaft press-fitting means 10. The shaft robot hand 15 is attached to the protruding right slide guide 13, and the camshaft robot hand 16 is attached to the left slide guide 14. These conveyors 11, 12 and slide guides 13, 14 are mounted on a common frame 29. The shaft robot hand 15 lifts the horizontal shaft 25 coming to the left end of the shaft conveyor 11, and then makes it upright,
It moves to the shaft press-fitting means 10 along the slide guide 13 on the right side, passes the shaft to the shaft press-fitting means 10, and then returns to the original state. The shaft conveyor 11 advances one pitch to the left when the shaft robot hand 15 lifts the shaft at the left end. The camshaft robot hand 16 receives the camshaft assembled from the shaft press-fitting means in an upright state, moves along the left slide guide 14 as it is, then tilts the camshaft horizontally and descends,
The camshaft 31 is placed on the right end of the camshaft conveyor 12. When the camshaft is placed on the right end, the camshaft conveyor 12 advances one pitch to the left.

A multi-row cam conveyor 17 is arranged on a frame 33 behind the shaft press-fitting means 10, and the cams 26 classified according to the row are supplied. On the frame 32, clamper holders 19 for holding the same number of clampers 27 as the rows of the cam conveyor are arranged. Provided is a cam robot hand (18) for simultaneously gripping the cams at the front end of each row of the cam conveyor (17) and fitting the cams to all the clampers of the clamper holder (19). The cam robot hand 18 is attached to the guide beam 34 in the front-rear direction fixed to the frame 33. A slide table 20 having two clamper holding holes 28 as cam holding means and reciprocating left and right is installed on the frame 32. When the slide table 20 moves to the left, the cam shaft hole in the clamper holding hole on the right side moves to the press-fitting position coaxial with the chuck, and when it moves to the right, the cam shaft hole in the clamper holding hole on the left side moves to the chuck. It is located in the press-fitting position coaxial with. Slide table 20
There is provided a clamper robot hand 21 for returning an empty clamper to the clamper holding table 19 from the clamper holding hole which is not coaxial with the chuck and for fitting the camped clamper on the clamper holding table into the empty clamper holding hole. The clamper robot hand 21 is attached to the left and right guide beams 34 provided on the frame 33.

As shown in FIGS. 2 and 3, two screw shafts 36 are erected on the frame 32 of the shaft press-fitting means 10, and the elevating beam 35 is passed to the shafts. Although not shown, when the screw shaft 36 is rotated, the lifting beam is
35 goes up or down. Chuck in center of lifting beam 35
Attach 30 rotatably. A geared motor 39 is attached to the lifting beam 35, and a gear 38 is fixed to its output shaft. The gear 38 is engaged with the rotation gear 37 of the chuck, and the rotation of the chuck 30 is controlled by the geared motor 39.

A frame 43 of the processing means 22 is fixed to the frame 32, and a cylinder 42 for reciprocating the knurled rolling roll 23 in the front-back direction is provided. The rail 41 is fixed on the frame 32, and the slide table 20 is placed on the frame 32 so that the slide table 20 can reciprocate left and right. A cylinder 40 for reciprocating the slide table 20 is arranged on the frame 32. Center means under the frame 24
The center of is placed coaxially with the chuck 30 so that it can be raised and lowered.

Next, the assembly of the camshaft will be described. In advance, the shaft 25 is supplied to the shaft conveyor 11, the cam 26 is supplied to the cam conveyor 17, and the clamper 27 is arranged on the clamper holder 19. When the apparatus is started, the cam robot hand detects that the clamper 27 of the clamper holder 19 is empty and lifts the cam 26 at the front end of the cam conveyor 17 to fit it into the clamper 27 of the clamper holder 19. Therefore, the cam conveyor 17 advances by one pitch. The clamper robot hand 21 lifts one of the cam-equipped clampers 27 on the clamper holder 19 by sensing that the cam in the clamper holding hole 28 on the left side, which is not in the press-fitting position of the slide table 20, is empty. The first cam clamper 27 is fitted into the empty clamper holding hole 28. Slide table 20
Detects that the cam on the right side of the clamper holding hole on the other side of the chuck 30 is empty and moves to the right side, and the left side clamper holding hole into which the first cam clamper 27 is fitted is coaxial with the chuck 30. Place it in the press-fitting position of. Then, the clamper robot hand 21 detects that the cam in the clamper holding hole on the right side is empty. At this time, if there is a clamper in the clamper holding hole, the clamper robot hand 21
Removes the empty clamper from the clamper holding hole of the slide table 20 and places it in the empty position of the clamper holding table.
At the same time, the robot shaft hand 15 detects that the chuck 30 is empty and lifts the horizontal shaft 25 at the left end of the shaft conveyor 11, then moves it upright and moves along the slide guide 13, and chucks the shaft 30. And hold it in the same coaxial position.

Then, as shown by arrows A and B in FIG. 4A, the chuck 30 descends to grip the upper end of the shaft 25, and the center 24 rises to contact the lower end of the shaft 25. Center the shaft 25. At this time, the shaft 25 penetrates the shaft hole of the first cam 26a held by the slide table 20, but there is no problem because the outer peripheral unprocessed portion of the shaft 25 has a smaller diameter than the cam shaft hole. Then, FIG. 4 (b)
As shown by the arrows C and D in FIG.
24 returns to its original position. Next, as shown by an arrow E in FIG. 4C, the chuck 30 descends so that the first cam mounting position meets the position of the processing means, and then, as shown by an arrow F, the knurled rolling roll. 23 is engaged with the shaft 25, and the arrow G
The chuck 30 is rotated as indicated by. As a result, the first
The knurl is rolled at the cam assembly position. Figure 4 after rolling
As shown by arrows H and I in (d), the chuck 30 and the knurled rolling roll 23 are returned to their original positions, and as shown by an arrow J, the chuck 30 is partially rotated to slide the angular position of the shaft 25. Align with the angular position of the first cam 26a held by the table 20. Next, as shown by an arrow K in FIG. 4 (e), the chuck 30 is lowered to press the first cam assembly position where the knurl is rolled into the shaft hole of the first cam 26a held by the slide table 20. The first cam 26a is integrally fitted to the shaft 25. Then, as shown by an arrow L in FIG. 4 (f), the chuck 30 is lifted to remove the first cam 26a from the slide table 20. The clamper 27 without a cam remains in the clamper holding hole 28 of the slide table 20. Then, in FIG. 4 (g), an arrow M
Move the slide table 20 as shown in
The shaft hole of 26b is arranged at a press-fitting position coaxial with the shaft 25.
Further, as shown by the arrow N, the empty clamper 27 is taken out from the clamper holding hole 28 which is out of the press-fitting position, and as shown by the arrow O, the clamper 27 holding the third cam 26c is fitted therein. In this way, after the first cam is assembled to the shaft, the operations shown in FIGS. 4 (b) to 4 (g) are sequentially repeated to sequentially press-fit and fit the predetermined cams onto the shaft, thus assemble.

[0019]

As described above, according to the present invention, since the shaft is centered when it is gripped by the chuck, there is no fear of the shaft swinging, and the machining means at the cam assembly position on the outer peripheral surface of the shaft is horizontal to the shaft. The slide table that holds the cam to be mounted on the shaft only slides back and forth, so the time required for assembling the cam shaft can be greatly shortened. It has an excellent effect that full automation is easy.

[Brief description of drawings]

FIG. 1 is a plan view showing an apparatus according to an embodiment of the present invention,

FIG. 2 is a front view showing a main part of the apparatus shown in FIG.

FIG. 3 is a side view showing a main part of the apparatus shown in FIG.

FIG. 4 is a schematic view showing a process of assembling a cam on a shaft,

[Explanation of symbols]

10: Shaft press-fitting means, 11: Shaft conveyor, 12: Cam shaft conveyor, 13, 14: Slide guide, 15: Robot hand for shaft, 16: Robot hand for cam shaft, 17: Cam conveyor, 18: Robot hand for cam, 19: clamper holder, 20: slide table, 21:
Robot hand for clamper, 22: processing means, 23: rolling roll, 24: center means, 25: shaft, 26: cam, 2
7: Clamper, 28: Clamper holding hole, 29: Frame, 3
0: Chuck, 31: Camshaft, 32, 33: Frame, 3
4: Guide beam, 35: Lifting beam, 36: Screw shaft, 37, 38: Gear, 39: Geared motor, 40: Cylinder, 41: Rail, 42: Cylinder, 43: Frame

Claims (5)

[Claims] 1. A step of lowering a chuck (30) of a shaft press-fitting means (10) holding an upper end of a shaft (25) to adjust a cam mounting position of a shaft outer peripheral surface to a processing position of a processing means (22). , A step of engaging the processing means with the shaft, then rotating the shaft to process the shaft outer peripheral surface cam assembly position, returning the processing means to the original position, and lifting the chuck to the original position. After that, or at that position, the chuck is partially rotated to match the angular position of the cam (26) held by the cam holding means (20), and then the chuck is lowered to move the shaft hole of the cam. A step of press-fitting the shaft outer peripheral surface cam mounting position into the shaft and fitting the cam therein, and then a step of raising the chuck to the initial position; and a step of moving the next cam held by the cam holding means to the chuck. Same as A method comprising the step of aligning with an axis, when the chuck first grips the upper end of the shaft, the lower end of the shaft is centered by a center means, and the cam holding means (20) holds two cams. A method for manufacturing a cam shaft, wherein the axes of the two cams are alternately arranged coaxially with the chuck. 2. A cam released by the chuck (30) by the camshaft robot hand (16) when the shaft (25) is coaxially supplied to the chuck (30) from below by the robot hand for shaft (15) and gripped. The method of manufacturing a camshaft according to claim 1, wherein the shaft (31) is coaxially received. 3. A shaft press-fitting means (10) for rotating and ascending and descending a chuck (30) for removably gripping an upper end of a shaft (25), and processing in a radial direction of the shaft gripped by the chuck. A device comprising a processing means (22) for moving a roll (23) in and out to roll the outer peripheral surface of the shaft such as knurling, and a cam holding means (20) for holding a cam (26) below the processing means. And
When the chuck holds the upper end of the shaft (25), a center means (24) for supporting and lowering the lower end of the shaft is provided, and the cam holding means has two clamper holding holes (28). Then, a slide table (20) capable of reciprocating horizontally is provided, and the clamper (27) fitted in the clamper holding hole is detachably held. When the slide table is at one position, one clamper holding hole is provided. When the shaft hole of the cam held by the fitted clamper is at the press-fitting position coaxial with the chuck and the slide table is at the other position, the shaft hole of the cam held by the clamper fitted in the other clamper holding hole is press-fitted. A device for manufacturing a camshaft, which is characterized in that it is in a position. 4. A shaft conveyor (11) for conveying a shaft and a camshaft (31) to a shaft press-fitting means (10).
And a camshaft conveyor (12) attached, the shaft (25) is lifted from the shaft conveyor, and the shaft robot hand (15) for supplying the shaft to the chuck (30) from below and gripping the shaft (25) is provided on the shaft conveyor. A camshaft robot hand (16) is attached to receive the camshaft (31) discharged from the chuck (30), and then the camshaft is placed on the camshaft conveyor, and the camshaft robot hand (16) is attached to the camshaft conveyor. The camshaft manufacturing apparatus according to claim 3. 5. A cam conveyor (1) for carrying a cam (26).
7) is attached to the shaft press-fitting means (10), and the clamper (2
A clamper holding table (19) for holding 7) is provided in the shaft press-fitting means, and a cam robot hand (18) for fitting the cam (26) from the cam conveyor into the clamper held by the clamper holding table is provided in the cam conveyor. The empty clamper (27) is transferred from the clamper holding hole (28) of the slide table (20) to the clamper holding table, and the clamper with the cam on the clamper holding table is fitted into the empty clamper holding hole of the slide table. 4. The camshaft manufacturing apparatus according to claim 3, wherein a clamper robot hand (21) for fitting is provided on the cam conveyor.