JP3040214B2 - Camshaft manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a camshaft used for opening and closing an intake / exhaust valve in an internal combustion engine or the like, and more particularly to a camshaft formed separately on the outer periphery of a shaft body. The present invention relates to a camshaft manufacturing apparatus suitable for manufacturing a camshaft in which both are integrated by fitting and fixing an element (for example, a cylindrical sleeve for a cam or a journal).

[0002]

2. Description of the Related Art Generally, a camshaft used for opening and closing an intake / exhaust valve in an internal combustion engine or the like includes a cylindrical shaft body and a plurality of cams such as a plurality of cams provided at predetermined positions on the outer surface of the shaft body. Shaft components, and these camshaft components are:
For example, it is formed integrally with the shaft body by forging, casting, or cutting.

Incidentally, the material required for the shaft and the material required for the camshaft components are generally different.

[0004] For example, a shaft is required to be made of a material excellent in torsional strength and bending strength.
A material having excellent wear resistance is required, and further, a material capable of reducing the weight of the entire camshaft is required.

However, in such a method of manufacturing a camshaft, since the camshaft constituent elements are integrated with the shaft main body, it is necessary to select an excellent material for all the above-described surfaces. However, there are many restrictions on the degree of freedom of material selection and cost. Furthermore, when it is necessary to change the specifications of the camshaft components, for example, to change the profile or mounting angle of the cam, it is impossible to share the cam and the shaft body, and forging dies and molds are raised for each type. Or the cutting conditions must be changed, and it is not possible to respond quickly to changes in specifications.

Therefore, conventionally, for example, Japanese Patent Application Laid-Open No. 2-150
A technology as disclosed in Japanese Patent Application Publication No. 542 has been proposed.

In this technique, as shown in FIG. 1, a plurality of protrusions having an outer diameter larger than the outer diameter of the shaft main body 1 are formed by subjecting a predetermined position on the outer peripheral surface of the cylindrical shaft main body 1 to plastic working. 2 are formed along the circumferential direction, while the cam 3
A through-hole 4 having substantially the same inner diameter as the outer diameter of the shaft body 1 is formed, and a spline 5 is formed on the inner surface of the through-hole 4.
After the shaft main body 1 is inserted, the cam 3 is rotated in the circumferential direction of the shaft main body 1 to perform positioning in the circumferential direction with respect to the shaft main body 1. Thereafter, the cam 3 is subjected to plastic working of the shaft main body 1. As shown in FIG. 2, by press-fitting into the portion, the ridge 2 is plastically deformed by the spline 5, and the two are firmly engaged, so that the shaft main body 1 and the cam 3 are fixed to each other. It is like that.

In such a technique, by keeping the dimensional relationship between the inner diameter of the through hole 4 and the outer diameter of the shaft body 1 constant, the cams 3 having various materials or profiles can be selectively formed on the shaft. It can be assembled to the main body 1 and simply by rotating the cam 3 to adjust the relative position in the circumferential direction with respect to the shaft main body 1,
The mounting angle can be changed.

[0009]

By the way, in such a conventional technique, when the cam 3 is assembled to the shaft main body 1, a large pressing force must be applied to the shaft main body 1 or the cam 3, and this It is necessary to reliably restrain the relative positional relationship between the shaft main body 1 and the cam 3 under such high pressure to prevent the cam 3 and the shaft main body 1 from being displaced during press-fitting.

In addition, since a plurality of cams 3 must be mounted on the shaft body 1 and must be mass-produced, it is desired to develop a manufacturing device capable of performing these operations continuously. ing.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and is characterized in that a shaft body is formed by a camshaft component formed separately from the shaft body. A camshaft component fixing means for holding and fixing the camshaft component by press-fitting the camshaft component into a predetermined position of the shaft main body. Is provided,
A conveying unit that intermittently conveys the camshaft component to an assembly position with the shaft main body, and is provided so as to be insertable into a camshaft component fixed by the camshaft component fixing unit at the assembly position, A guide unit that is engaged with and disengaged from one end of the shaft main body, a grip unit that is disposed to face the guide unit at a predetermined interval, and that grips the other end of the shaft main body; Pressing means for inserting the shaft main body into the camshaft component by moving toward the component fixing means, rotation driving means for applying rotation of the shaft main body around its axis, and The shaft body is provided so as to be able to freely contact and separate in the direction perpendicular to the axis, and the outer peripheral surface of the shaft Plastic working means, and moving means for relatively moving the plastic working means along the longitudinal direction of the shaft main body, wherein the pressing means comprises a servo cylinder for positioning the shaft main body, The means comprises a servomotor capable of determining the rotation angle of the shaft body and a reference position detecting mechanism for detecting a reference position around the axis of the shaft body, and the moving means is screwed to the plastic working means. And a servo motor that rotates the feed bolt, and controls the servo cylinder and both servo motors to position the shaft main body with respect to the camshaft component, to determine the rotation angle of the shaft main body. An indexing operation and a moving operation of the plastic working means along the shaft body are performed. Cormorant control unit in that provided.

The camshaft component is a cam, or a cylindrical sleeve for a journal mounted between the cams as needed.

[0013]

According to the camshaft manufacturing apparatus of the present invention,
The camshaft component fixing means fixes the camshaft component and is conveyed to the assembly position by the conveying means, while the gripping means grips the shaft body at the other end, and the camshaft component fixing means Are held in place relative to a camshaft component that is secured to the camshaft.

In this state, when the guide means is operated, the guide means penetrates the camshaft component fixed to the camshaft component fixing means and engages with one end of the shaft main body. Let me
Thereby, both ends of the shaft main body are fixed.

Further, the plastic working means is moved along the longitudinal direction of the shaft main body by the servo motor via the feed bolt of the moving means, and is positioned at a predetermined position on the shaft main body. While the shaft body is rotated by the servo motor of the driving means, the plastic working means is brought into contact with and operated by the plastic body, so that the outer peripheral surface of the shaft body is subjected to circumferential processing.

After the plastic working means is separated from the shaft main body, the shaft main body is rotated to a predetermined position by a servo motor based on a reference position detecting mechanism of the rotary drive means, thereby forming the camshaft. The circumferential positioning with the element is performed, and then the gripping means and the shaft body are moved toward the camshaft component fixing means by the servo cylinder of the pressing means, and the shaft body is inserted into the camshaft component. .

This insertion operation is performed continuously, and the concave and convex portions formed on the shaft main body are press-fitted and fixed to the camshaft components.

Thus, the servo cylinder of the pressing means is operated in the reverse direction, the shaft body is pulled out from the camshaft component fixing means together with the fixed camshaft component, and the guide means is also the camshaft component. Pulled out from the fixing means.

Next, by actuating the conveying means, the camshaft component fixing means to which the next camshaft component to be fixed is fixed is conveyed to the assembling position. A camshaft component is fixed at a predetermined angle at a predetermined position on the shaft body.

By repeating the above operation a required number of times, a plurality of camshaft components are sequentially fixed to the shaft main body. As described above, the plastic working means is positioned at a predetermined position of the shaft main body by the servo motor of the moving means, and the unevenness is formed along the circumferential direction of the shaft main body, and the shaft main body is moved to the reference position detecting mechanism of the rotary driving means. After being rotated at a predetermined angle by a servomotor based on the above, the shaft body is inserted into the camshaft component by the servo cylinder of the pressing means, and the uneven portion of the shaft body is positioned on the camshaft component. Press and fix.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 10. As shown in FIGS.
A camshaft component fixing means (hereinafter referred to as a cam fixing means) 11 for holding and fixing a cam (a cam is exemplified as a camshaft component in this embodiment) is provided, and the cam is assembled with the shaft main body S. A conveying means 12 for intermittently conveying to a position, and a guide means 13 provided so as to be able to be inserted into a cam fixed by the cam fixing means 11 at the assembling position and engaged with and disengaged from one end of the shaft main body S. A gripping means 14 which is arranged opposite to the guide means 13 at a predetermined interval and grips the other end of the shaft main body S, and by moving the gripping means 14 toward the cam fixing means 11,
Pressing means 1 for inserting the shaft main body S into the cam
5, a rotation driving means 16 for rotating the shaft main body S around its axis, and a rotating drive means 16 provided on the shaft main body S so as to approach and separate from the shaft main body S in a direction perpendicular to the axis thereof. Plastic working means 17 for performing unevenness processing along the direction, and moving means 18 for relatively moving the plastic working means 17 along the longitudinal direction of the shaft main body S, and assembled to the base B. I have.

Next, the details will be described. As shown in FIG. 5, the transport means 12 is mounted on the base B, and has a disk-shaped index table 19 which rotates intermittently. This index table 1
The cam fixing means 11 is provided on the upper surface of the index table 19 (upper in FIG. 5).

A plurality (for example, eight) of the cam fixing means 11 are radially provided on the index table 19, and each of the cam fixing means 11 is a base plate 21 fixed to the index table 19.
An air cylinder 22 attached to the base plate 21 on the rotation center side of the index table 19; and an air cylinder 22 provided so as to be able to move up and down through the base plate 21 and the index table 19, and a cam C is mounted on the upper end. Support pipe 24 and base B
A ring-shaped load cell 25 disposed on the lower end of the support pipe 24 and disposed between the base plate 21 and the support pipe 24, and the support pipe 24 is connected to the load cell. A spring 26 that is urged in a direction away from 25 and is held at a predetermined raised position via a stopper ring 23, and is actuated by the air cylinder 22 and is mounted on the support pipe 24. And a clamp mechanism 27 for gripping the outer peripheral portion of the cam C and restraining its rotation.

As shown in FIGS. 6 and 10, the clamp mechanism 27 includes a pair of sliding blocks 20 provided on the upper surface of the base plate 21 via a pair of guide plates GA so as to approach and separate from each other. A pair of V-block-shaped clamp pieces 28 attached to the upper ends of these sliding blocks 20; and slidably mounted on the base plate 21 via a pair of guide plates GB. And an operating piece 29 for moving one of the clamp pieces 28 toward and away from the other clamp piece 28 by being slid.

More specifically, the pair of clamp pieces 28 are disposed so that their respective V-grooves face each other, and the cam C is connected to the support pipe 2 between the two V-grooves.
4 is held in a state where the posture in the direction around the axis is regulated.

One of the sliding block 20 and one of the clamp pieces 28 is configured to be slidable along a pair of guide plates GA in a direction orthogonal to the operating direction of the air cylinder 22. The other of the sliding block 20 and the clamp piece 28 is slid and adjusted along the two guide plates GA, and then the base plate 2
1 is fixed.

A guide hole 30 which is inclined with respect to the operating direction of the air cylinder 22 is formed in the one slidable slide block 20.
An operation rod 31 integrally and slidably attached to the operating piece 29 and inclined in the same manner as the guide hole 30 is slidably fitted to the operation piece 29.

Therefore, when the operating piece 29 is slid along the pair of guide plates GB by the air cylinder 22, the operating rod 31 and the guide hole 30 are moved.
Slidable sliding block 20
The clamp piece 28 is slid in a direction to approach and separate from the other slide block 20 and the clamp piece 28.

As shown in FIG. 5, a distributor 3 for distributing and supplying compressed air to the air cylinder 22 is provided at the center of rotation of the index table 19.
2 are provided.

The distributor 32 includes an air supply cylinder 33 to which the geared motor is connected and into which compressed air as a working fluid of the air cylinder 22 is fed.
A split cylinder 34 fitted to the outer periphery of the air supply cylinder 33 and fixed to the index table 19 and rotated integrally with the air supply cylinder 33;
A flow path switching valve 35 that is provided at a position corresponding to each of the air cylinders 22 and switches the operation direction of the air cylinder 22 by switching the supply direction of compressed air to the air cylinder 22;
3 is attached to a support plate 36 provided at the upper end of
Actuator 3 comprising an air cylinder or an electromagnetic solenoid for driving each of the flow path switching valves 35
7 is provided.

On the other hand, the base B is provided with a pair of parallel guide rods 38 penetrating vertically, and the guide means 13 is mounted below the guide rods 38 below the base B. Have been.

As shown in FIG. 4, the guiding means 13
A slide plate 39 provided so as to be bridged between the guide rods 38 and slidably supported at both ends by the guide rods 38, and a substantially intermediate portion in the longitudinal direction of the slide plate 39, Elevating mechanism 4 provided at a portion located below load cell 25
0.

As shown in FIG. 5, the lifting mechanism 40
Guide pipe 4 fixed to the slide plate 39
1, an elevating rod 42 slidably penetrating through the guide pipe 41, and an air cylinder 43 integrally attached to the guide pipe 41 and sliding the elevating rod 42 in the axial direction. The other end of the lifting rod 42 is engaged with one end of the shaft main body S (in the present embodiment,
Since the shaft main body S is formed in a tubular shape, the shaft main body S is axially engaged by being inserted into the shaft main body S.) An engaging member 44 is rotatably mounted around its axis.

The engaging member 44 is moved in a direction protruding from the guide pipe 41 by the action of the air cylinder 43, so that the cam fixing means located above the engaging member 44 as shown in FIG. 11 and the cam C supported by the support pipe 24 and the cam C supported by the support pipe 24, and are drawn inside the guide pipe 41 so as to be positioned inside the load cell 25. Has become.

The gripping means 14 is, as shown in FIG.
The pair of guide rods 38 are incorporated in an elevating block 45 slidably mounted along the length direction of the guide rods 38, and as shown in FIG. An air chuck 46 is provided coaxially with 42 and is rotatably provided around this axis.

As shown in FIG. 7, a driven pulley 4 is provided at a substantially middle portion of the air chuck 46 in the longitudinal direction of the rotating shaft.
The driven pulley 47 constitutes a part of the rotation driving means 16.

The rotary drive means 16 includes an AC servomotor 48 mounted on the elevating block 45 in parallel with the air chuck 46, a drive pulley 49 fixed to an output shaft of the servomotor 48, It is constituted by a timing belt 50 wound around the driving pulley 49 and the driven pulley 47, and a reference position detecting mechanism A provided between the driven pulley 47 and the elevating block 45.

The reference position detecting mechanism A comprises a position detecting pin 51 protruding from the driven pulley 47 and a sensor 52 mounted on the elevating block 45 so as to face the same. By the detection, the reference position in the rotation direction of the air chuck 46, that is, the reference position around the axis of the shaft body S being held is set.

Further, as shown in FIG. 4, the elevating block 45 and the slide plate 39 are integrally connected by a pair of tie rods 53. It can be moved in the length direction.

Therefore, the air chuck 46 of the gripping means 14 and the engaging member 44 of the guiding means 13 are in a state where the movement of the engaging member 44 is restricted, that is, in a state where the position of the lifting rod 42 is fixed. Can be integrally moved while maintaining an interval therebetween.

As shown in FIGS. 3, 4, and 7, the pressing means 15 uses a hydraulically driven servo cylinder in this embodiment, and the upper end of the pair of guide rods 38. The air chuck 4 is attached to an upper frame 54 held at a predetermined interval from the base B integrally with the base B.
6 is mounted coaxially.

The output shaft 55 of the pressing means 15
As shown in FIG. 7, the air chuck 46 is connected to the elevating block 45 via a connecting member 56 together with the elevating block 45 and the guide rod 3.
8, the shaft main body S gripped by the gripping means 14 is pushed toward the cam fixing means 11. The servo cylinder of the pressing means 15 is controlled by a hydraulic servomotor of a hydraulic circuit (not shown), thereby positioning the shaft main body S in the vertical direction.

As shown in FIG. 3, the plastic working means 17 is slidably mounted on a pair of second guide rods 57 erected on the base B in parallel with the guide rods 38. The base plate 58 and the base plate 58
A cylindrical backup roller 59 rotatably supported on the outer periphery of the shaft body S gripped by the gripping means 14, and supported so as to be able to advance and retreat at a position to be brought into contact with the outer peripheral surface of the shaft body S. And a pair of sizing rollers 60 on which the sizing roller 60 is formed.

The backup roller 59 is rotatably supported at the tip of a slide arm 61 as shown in FIG. 8, and the slide arm 61 is attached to the slide box 6 mounted on the base plate 58.
2 and slidably held by a hydraulic cylinder 63 interposed between the slide arm 61 and the base plate 58,
As shown by a chain line in FIG. 8, the shaft body S is held in a fixed position so as to be in contact with one side surface.

The slide box 62 is provided as shown in FIG.
As shown in the figure, the slide arm 61 is slidable in a direction orthogonal to the sliding direction, and the fine adjustment mechanism 64 interposed between the slide arm 61 and the base plate 58 allows fine adjustment in the above-described direction. Positioning is performed.

With such a configuration, when the shaft main bodies S having different outer diameters are mounted, the positional deviation between the backup roller 59 and the outer surface of the shaft main body S is corrected, and reliable contact is performed. It is a measure for.

On the other hand, a slide box 65 slidable in a direction perpendicular to the sliding direction of the slide arm 61 is mounted on the base plate 58. The slide box 65 has a pair of swing arms 66. The sizing rollers 60 are rotatably mounted on one ends of the swing arms 66, respectively.

A hydraulic cylinder 67 for sliding the slide box 65 is interposed between the slide box 65 and the base plate 58. 60 is pressed against the surface of the shaft main body S held at a predetermined position with a predetermined pressure.

Then, the both sizing rollers 60
In such a state that the shaft body S is positioned between the sizing rollers 60 in a state where the sizing roller 6 is in contact with the shaft body S,
The positional relationship is set so that 0 and the backup roller 59 are located at each vertex of an isosceles triangle when viewed from the axial direction of the shaft main body S.

As shown in FIG. 9, the sizing roller 60 and the backup roller 59 are shifted from each other in the axial direction of the shaft main body S when viewed from the radial direction of the shaft main body S. In addition, a mutual positional relationship is set, and this is a measure taken to prevent the portion processed by the sizing roller 60 from being deformed by the backup roller 59.

Further, in this embodiment, on the side of the swing arm 66 where the sizing roller 60 is not mounted, the two swing arms 66 are relatively moved in a direction in which the two sizing rollers 60 approach each other. A pivoting spring 68 is interposed, and is screwed to one swing arm 66 so as to be brought into contact with the other swing arm 66, thereby setting the maximum separation distance between the two sizing rollers 66. , An opening angle adjusting bolt 69 is provided.

The moving means 18 is rotatably supported by the upper frame 54 and the base B and is screwed to the base plate 58 of the plastic working means 17 as shown in FIG. An AC servomotor 71 fixed to the base B and connected to the feed bolt 70 to rotate the feed bolt 70. A hydraulic servomotor for driving the servo cylinder of the pressing means 15;
The AC servomotor 48 and the AC servomotor 71 of the moving means 18 are controlled by control means (not shown) based on the cam C mounting position on the shaft body S and the cam C position angle input in advance. By controlling, the positioning operation of the shaft body S with respect to the cam C, the operation of determining the rotation angle of the shaft body S, and the operation of moving the plastic working means 17 along the shaft body S are performed.

Next, the operation of this embodiment constructed as described above will be described. First, the air cylinder 22 of each cam fixing means 11 is operated to widen the space between both clamp pieces 28, and the cam C Insert the support pipe 24
After being placed on the upper side, the air cylinder 22 is operated again to fix the cam C in a predetermined posture.

After this operation, as shown in FIG. 7, one end of the shaft main body S is held by the air chuck 46 of the holding means 14, and as shown in FIG. By actuating, the lifting rod 42 is inserted into one of the cam fixing means 11, the cam C fixed to the cam fixing means 11 is penetrated, and the The joining member 44 is engaged with the other end of the shaft body S located above the joining member 44. In this state, the shaft body S is sandwiched between the gripping means 14 and the guiding means 13 at both ends.

Prior to this, when the shaft main body S is gripped by the gripping means 14, the servo motor 71 of the moving means 18 is operated, whereby the plastic working means 1 is moved.
7 is moved to a predetermined position of the shaft main body S.

Next, by operating the servo motor 48 of the rotary drive means 16 to rotate the air chuck 46, the shaft main body S held by the air chuck 46 is rotated, as shown in FIG. As shown by the dashed line, the slide arm 61 is moved by one hydraulic cylinder 63 of the plastic working means 17 so that the backup roller 59 at the tip thereof abuts on the side of the shaft body S, and at the same time, the other hydraulic cylinder 63 By operating 67, both sizing rollers 60 are brought into contact with the side of the shaft main body S at a predetermined pressure.

As a result, the sizing roller 60 in the pressed state applies a plurality of concavo-convex processing to the outer peripheral surface at a predetermined position of the shaft body S over the entire circumference. In this case, the shaft body S includes a pair of sizing rollers 6.
0, the unevenness processing is performed, so that the time required for the processing can be reduced, and a pair of sizing rollers 60
Are biased in the direction of approaching each other by the spring 68, so that the contact force between the two sizing rollers 60 by the hydraulic cylinder 67 can be amplified to firmly clamp the shaft body S between the two sizing rollers 60. Since the shaft main body S is supported by both the sizing rollers 60 and one backup roller 59, a centering function can be provided, and the shaft main body S can be reliably and uniformly processed at the time of processing.

After such processing is performed, the respective hydraulic cylinders 63 and 67 of the plastic processing means 17 are operated in the opposite direction to separate the rollers 59, 60 and 60 from the shaft main body S, and After the periphery of the shaft body S is largely opened, and the air chuck 46 is rotated by the set value of the servomotor 48 with the time point at which the position detection pin 51 is detected by the sensor 52 as the origin, the rotation driving means 16 Of the servo motor 48 is stopped, and the shaft main body S is stopped at a predetermined position around the axis.

By operating the servo cylinder of the pressing means 15, the rotation driving means 16, the gripping means 14, the shaft body S, and the guide means 13 are integrally lowered, and the shaft body S is It is inserted into a cam C fixed to the cam fixing means 11.

By performing such operations continuously, the portion of the shaft body S that has been subjected to the uneven processing is pressed into the inner surface of the cam C, and both are firmly fixed. The lowering limit of S corresponds to the position of the unevenness processing by the plastic working means 17 and the pressing means 1
5 is controlled by manipulating the operation amount of the servo cylinder, and the pressure at the time of press-fitting is detected by bringing the support pipe 24 descending with the cam C into contact with the load cell 25. When the pressure at the time of press-fitting detected by the load cell 25 indicates an abnormal value, the operation of the device is immediately stopped. Further, the detection result can be fed back to the pressing means 15 to control the press-fitting pressure.

When the fixing of one cam C is completed in this way, first, the air cylinder 2 of the cam fixing means 11
2 is operated in the opposite direction to release the fixed state of the cam C in the fixed state, and then the rotation driving means 16, the gripping means 14, the shaft body S, and the guide means 13 are raised by the pressing means 15. Then, the shaft body S with the cam C integrated is pulled out from the cam fixing means 11.

Next, the air cylinder 43 provided on the guide means 13 is operated to draw the elevating rod 42 into the load cell 25, so that the superposed state of the elevating rod 42, the cam fixing means 11 and the transport means 12 is released. After that, the conveying means 12 is rotated by a predetermined amount by the geared motor, whereby the cam fixing means 11 to which the next cam C is fixed is aligned with the shaft main body S. At the same time, the plastic body 17 is returned to the origin (upper limit position) by the servo motor 71 of the moving means 18 with respect to the shaft body S which is waiting.
Is moved in the up-down direction to match a predetermined position (an uneven processing position) next to the shaft main body S.

Thus, the guide means 13 is inserted into the cam fixing means 11 again, and the engaging member 44 is engaged with the end of the shaft main body S, and the predetermined operation of the shaft main body S is performed by the same operation as described above. The position is subjected to concavo-convex processing by the plastic working means 17, and further, an angle for fixing the next cam C is calculated from a reference position set by the positioning pin 51 and the sensor 52, and rotation is performed based on the calculation result. The shaft body S is rotated by the driving means 16.

Thereafter, by repeating the above-described operation a predetermined number of times, a predetermined number of cams C can be sequentially fixed to the shaft main body S at a predetermined angle.

As described above, according to the camshaft manufacturing apparatus 10 according to the present embodiment, a plurality of cams C can be continuously fixed to the shaft main body S at predetermined positions and at predetermined angles.

Therefore, the change of the fixed angle of the cam C can be dealt with simply by changing the rotation angle of the shaft main body S by the rotation driving means 16. Even in the case of fixing to the main body S, a quick and reliable response is possible only by placing a different cam C on the cam fixing means 11, and a sufficient effect can be expected when applied to multi-product small-quantity production.

The various shapes and dimensions of the components shown in the above embodiment are merely examples, and can be variously changed based on the type of the cam C and the shaft main body S to be applied, design requirements, and the like.

[0068]

As described above, in the camshaft manufacturing apparatus according to the present invention, the camshaft component is press-fitted into the camshaft component formed separately from the shaft body. A camshaft component fixing means for grasping and fixing the camshaft component, wherein the camshaft component fixing means for gripping and fixing the camshaft component is provided. Transport means for intermittently transporting the camshaft component to an assembly position with the shaft body, and one end of the shaft body provided so as to be able to be inserted into a camshaft component fixed by the camshaft component fixing means at the assembly position. Guide means to be disengaged from the part, and Is disposed, and gripping means for gripping the other end of the shaft body, by moving the gripping means towards the camshaft component fixing means,
Pressing means for inserting the shaft main body into the camshaft component, rotation driving means for applying rotation of the shaft main body around its axis, and being provided on the shaft main body so as to be able to freely contact and separate in a direction perpendicular to the axis. A plastic working means for subjecting the outer peripheral surface of the shaft body to unevenness along the circumferential direction; and a moving means for relatively moving the plastic working means along the longitudinal direction of the shaft body. Means is constituted by a servo cylinder for positioning the shaft body, the rotation driving means, a servomotor capable of determining a rotation angle of the shaft body, and a reference position detection mechanism for detecting a reference position around the axis of the shaft body. And the moving means is a feed bolt screwed to the plastic working means, and a servo motor for rotating the feed bolt. And controlling the servo cylinder and both servomotors to position the shaft body with respect to the camshaft components, determine the rotation angle of the shaft body, and follow the shaft body of the plastic working means. Since the control means for performing the moving operation is provided, the plastic working means is positioned at a predetermined position on the shaft main body by the servo motor of the moving means, and is rotated along the circumferential direction of the shaft main body by the rotation driving means and the plastic working means. After the shaft main body is rotated at a predetermined angle by a servomotor based on a reference position detecting mechanism of a rotary drive unit, the shaft main body is turned into a camshaft component by a servo cylinder of a pressing unit. And insert the shaft into the By press-fitted by positioning the shift components, excellent effects as follows.

A plurality of camshaft components can be continuously fixed to the shaft body at a predetermined position and at a predetermined angle. At the same time, by using a servo cylinder and a servo motor for the pressing means, the rotation driving means, and the moving means, respectively, and operating these by the control means, the positioning operation of the shaft main body with respect to the camshaft constituent element, the shaft main body The operation of determining the rotation angle and the operation of moving the plastic working means along the shaft main body can be performed smoothly and with high accuracy.

Therefore, for example, when the fixed angle of the cam is changed, it can be dealt with simply by changing the rotation angle of the shaft main body by the rotation driving means. Even when the camshaft component is fixed to the shaft body, quick and reliable response is possible simply by placing different camshaft components on the camshaft component fixing means, and it is sufficient for high-mix low-volume production. Can respond.

The shaft body can be changed to a material having sufficient strength only by the mounting operation, and a hollow body may be used as long as the material has sufficient strength. It is possible to quickly respond to a change in the specifications of the shaft, and it is possible to automate the assembly by simply changing the setting of various camshafts in a short time, thereby greatly reducing the production cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part for describing a conventional method of fixing a cam and a shaft main body.

FIG. 2 is a longitudinal sectional view showing a fixed portion between a cam and a shaft body fixed by the method shown in FIG. 1;

FIG. 3 is a side view of the entire apparatus according to one embodiment of the present invention.

FIG. 4 is a front view of the entire apparatus according to one embodiment of the present invention.

FIG. 5 is a partially cutaway side view showing a conveying unit, a guiding unit, a moving unit, and a cam fixing unit according to one embodiment of the present invention.

FIG. 6 is a plan view showing a cam fixing means according to one embodiment of the present invention.

FIG. 7 shows a gripping means, a rotary driving means,
It is the side view which fractured and showed a part of each pressing means.

FIG. 8 is a partially omitted bottom view showing the plastic working means of one embodiment of the present invention.

FIG. 9 is a longitudinal sectional side view partially showing a plastic working means according to an embodiment of the present invention, with a part thereof omitted.

FIG. 10 is a partially cutaway side view showing a conveying means and a cam fixing means according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Camshaft manufacturing apparatus 11 Cam fixing means 12 Conveying means 13 Guide means 14 Gripping means 15 Pressing means 16 Rotation driving means 17 Plastic working means 18 Moving means 48 Servo motor 70 Feed bolt 71 Servo motor S Shaft main body C Cam A Reference position detection mechanism

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yukio Fujiwara 985 Ino, Ginya, Ikuno-cho, Asago-gun, Hyogo Prefecture Inside the Ikuno Works, Mitsubishi Materials Corporation (72) Inventor Akira Kawaguchi, Ikuno-cho, Asago-gun, Hyogo 985 No.1 Ino, Kuchigaya Character Inside Ikuno Works, Mitsubishi Materials Corporation (72) Inventor Seiichi Kirigaya 3-1, Koganecho, Niigata City, Niigata Prefecture Mitsubishi Materials Corporation Niigata Works (58) Fields surveyed (58) Int.Cl. ⁷ , DB name) B23P 19/02 F16H 53/02

Claims (1)

(57) [Claims] 1. A camshaft in which a shaft main body is press-fitted into a camshaft component formed separately from the shaft main body, whereby the camshaft component is assembled and fixed at a predetermined position of the shaft main body. A manufacturing apparatus, wherein a camshaft component fixing means for gripping and fixing the camshaft component is provided, and a conveying means for intermittently conveying the camshaft component to an assembly position with the shaft body. A guiding means provided so as to be insertable into a camshaft component fixed by the camshaft component fixing means at the assembling position, and being disengaged from one end of the shaft main body; Holding means for holding the other end of the shaft body, Pressing means for inserting the shaft body into the camshaft component by moving the gripping means toward the camshaft component fixing means, and rotation driving means for applying rotation of the shaft body about its axis. A plastic working means provided on the shaft body so as to be able to freely contact and separate in a direction perpendicular to the axis thereof, and performing irregularity processing on the outer peripheral surface of the shaft body along the circumferential direction; A moving means for relatively moving the shaft body in the direction of the axis, wherein the pressing means is constituted by a servo cylinder for positioning the shaft body, and the rotation driving means is capable of calculating a rotation angle of the shaft body. And a reference position detection mechanism for detecting a reference position around the axis of the shaft body, and wherein the moving means is A feed bolt screwed to the machining means and a servomotor for rotating the feedbolt, and controlling the servo cylinder and both servomotors to position the shaft body with respect to a camshaft component; A camshaft manufacturing apparatus, further comprising control means for performing an operation for determining a rotation angle of a main body and an operation for moving the plastic working means along the shaft main body.