JP2003231024A - Manufacturing device of cam shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing device of a cam shaft capable of easily heating a cam piece uniformly with high accuracy, and enlarging a shaft hole with a simple structure. <P>SOLUTION: This manufacturing device of the cam shaft is composed of a cam table 1 (a-h) for holding each cam piece C, a heating means 2 for heating each cam piece C to enlarge its shaft hole Ca, a displacement means for moving the shaft hole Ca of each cam piece C between a first position for aligning the shaft holes on a shaft-insertion shaft center CL, and a second position separated from the first position in the peripheral direction of the shaft-insertion shaft center, and a shaft inserting means 4 for inserting a shaft S into each shaft hole Ca of each held cam piece C, when each cam table 1 (a-h) is located on the first position. The heating means 2 is composed of a heating means body 25 supported to be close to or separated from the cam piece C, and a heater block 24 supported by the heating means body 25 and brought into contact with the cam piece C. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camshaft manufacturing apparatus, and more particularly to a camshaft manufacturing apparatus in which a plurality of cam pieces each having an axial hole are fixed to the shaft at predetermined phases.

[0002]

2. Description of the Related Art Among camshafts used in valve actuation mechanisms for opening and closing supply / exhaust valves of internal combustion engines, a columnar (or cylindrical) shaft and a cam piece are provided as separate members, and they are combined. Some have different structures. The main reason for adopting such a structure is that different mechanical properties are required for the shaft and the cam piece. Such a cam shaft is generally fixed by inserting the shaft into the shaft hole of the cam piece with the nose of the cam piece being oriented in a predetermined phase by expanding the diameter of the shaft by heating the cam piece. It is composed of The cam piece assembled to the shaft contracts due to subsequent cooling and is firmly fixed to the shaft in a tight fit (also referred to as shrink fit) state. And in the cam piece of such valve operating mechanism,
There is a so-called three-dimensional cam in which the cam profile surface is inclined with respect to the axis of the cam shaft so that the area of both adjacent side surfaces is different so that the opening / closing timing of the supply / exhaust valve can be changed. . In such a three-dimensional cam, the opening / closing timing of the supply / exhaust valve is changed by moving the shaft in the axial direction. By the way, since the cam piece of the three-dimensional cam has high molding accuracy, it is often molded by sintering. In sintering, powdered materials are generally pressed into a desired shape by pressing in a mold and bonded at an appropriate temperature.

As a conventional technique for manufacturing such a camshaft, for example, Japanese Unexamined Patent Publication No. 2000-73709 discloses a camshaft assembling apparatus for inserting and fixing a required number of cam pieces into a shaft body. A table on which a plurality of cam pieces are placed, a means for heating the cam pieces on the table, a moving means for moving the table to a predetermined position after heating the cam pieces, and a cam body on the cam pieces on the table after the movement. An assembling device for a camshaft is disclosed, which comprises: Further, in the publication, there is provided a camshaft assembling apparatus for inserting and fixing a required number of cam pieces into a shaft body, and a plurality of tables for mounting the cam pieces one by one with the cam pieces being oriented in a predetermined direction in advance. And a displacement means for displacing each table between a first position where the cam pieces on the plurality of tables are coaxially aligned, and a second position where the cam pieces are spaced apart so as not to overlap each table, and each table is Means for inserting the shaft body into the cam pieces on each table when in the first position, and heating means for heating the cam pieces on each table when each table is in the second position. There is disclosed a device for assembling a camshaft. Further, in the publication, in addition to any one of the above-mentioned configurations, the heating means has an independent housing for each cam piece placed on the table, and the housing includes a plurality of heaters and a plurality of heaters. Disclosed is a camshaft assembling apparatus including a temperature measuring unit.

In this publication, the housing of the heating means is U-shaped in order to avoid clamping, and a cylindrical portion is provided between the portions sandwiched by the both ends parallel to each other. The cartridge heater and the temperature measuring means such as a thermocouple are built in each of the both ends and the cylindrical portion, and the temperature measuring means transmits the measurement result to the temperature control device, and the cartridge heater is based on this. It is described that power is supplied so that the temperature of each is uniform, respectively (paragraph number 0029).

[0005]

However, in the conventional technique disclosed in Japanese Patent Laid-Open No. 2000-73709, the following description is made. That is, "The table of the heating means is covered with the housing. Then, with respect to the opening (shaft hole) of the cam piece,
The cylindrical portion is inserted. The outside of the cam piece is surrounded by the U-shaped portion of the housing. Therefore, the entire cam piece can be heated uniformly. (Paragraph No. 0030) ”From the above description, in the conventional technique disclosed in Japanese Patent Laid-Open No. 2000-73709, heating is performed without directly touching the cam piece. Therefore, the cam piece and the housing are not heated. Since the intervals of will be partially different, it will be difficult to improve the accuracy of heating the cam piece.
Since it is difficult for the temperature measuring means built in the housing to accurately measure the heating temperature of the cam piece, there is a problem that the heating temperature varies depending on the cam piece portion or among a plurality of cam pieces. Then, when the shaft is inserted into the shaft hole in a state where the heating temperature of each cam piece is varied, there is a problem that the axial mounting position of each cam piece with respect to the shaft also varies. Further, when the cam piece is overheated, the surface hardness of the cam piece is lowered, and the mechanical properties of the cam shaft are lost. Further, as described above, in the cam piece of the three-dimensional cam formed by sintering, the side surface having the smaller area is used as a reference due to the draft when the powder material is formed in the mold. Become. The side surface is held as a reference surface so as to be in contact with the cam table even when assembled to the shaft. Therefore, the side surface having the larger area of the cam piece may not be parallel to the side surface having the smaller area. Therefore, the above-mentioned JP 2000-73709 A
In the conventional technique disclosed in the publication, the housing containing the cartridge heater cannot be brought into direct contact with the cam piece, and even if the cam piece is surrounded by the housing, the side portion of the cam piece prevents the housing from being attached to the housing. Since the distances are different, there is a problem that uniform heating may be difficult.
Further, in the case of the cam piece formed by sintering, the cam piece surface is projected from the cam profile surface to the outer peripheral edge of the side surface continuously in the axial direction due to the relationship of the parting line of the mold when molding the powder material. Burrs may occur. Even if an attempt is made to bring the heating means into contact with the side surface of such a cam piece, there is a problem that the heating means is not evenly contacted with the side surface, so that the cam piece cannot be heated uniformly.

The present invention has been made in view of the above problems, and in order to insert and fix the shaft into the shaft hole of the cam piece, the cam piece can be heated uniformly and accurately with a simple structure, and the shaft hole can be easily and accurately heated. It is an object of the present invention to provide a camshaft manufacturing apparatus capable of expanding the diameter of the camshaft.

[0007]

In order to achieve the above object, the invention of claim 1 is a camshaft manufacturing apparatus comprising a plurality of cam pieces each having an axial hole fixed to a shaft at a predetermined phase. There is provided a cam table for holding the cam piece, a heating means for heating so as to expand the diameter of the shaft hole of the cam piece, and an insertion means for inserting the shaft into the shaft hole of the expanded diameter cam piece. In addition, a heater block that comes into contact with the cam piece is provided. According to a second aspect of the present invention, in order to achieve the above object, in the first aspect of the invention, the heater block is supported by a heating means main body that can approach / retract with respect to the cam piece via an elastic body. It is characterized by being present. In order to achieve the above object, the invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the contact portion of the heater block is formed smaller than the contacted portion of the cam piece. It is a thing.

According to the first aspect of the present invention, the cam piece is held on the cam table, and the heater block of the heating means is evenly contacted with the cam piece to heat the cam piece. As a result, the cam piece does not overheat or underheat,
Ensures uniform heating to the desired temperature. The cam piece thermally expands and its shaft hole expands to a predetermined diameter. After that, insert the shaft into the shaft hole of the cam piece with the insertion means,
When the shaft hole contracts to its original diameter due to the cooling of the cam piece, the cam piece is fixed to the shaft at a predetermined position in a predetermined phase and assembled. Claim 2
In the invention described in claim 1, in the invention described in claim 1, the heating means main body is supported so as to be able to approach and retreat with respect to the cam piece, and the heater block is supported by the heating means main body via an elastic body. Therefore, when the heating means main body is brought close to the cam piece and the heater block is brought into contact with the cam piece,
The posture of the heater block changes according to the shape of the cam piece, and the heater block is surely and evenly contacted with the cam piece so as to be in close contact with the cam piece, thereby reliably heating the cam piece to a predetermined temperature evenly. In the invention of claim 3, claim 1
Alternatively, in the invention described in 2, the contact portion of the heater block is formed smaller than the contacted portion of the cam piece, so that a burr is formed so as to protrude from the cam piece to the outer peripheral edge thereof. Also, the heater block abutting portion is surely abutted so as to come into close contact with the abutted portion of the cam piece.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to FIGS. In the camshaft CS in this embodiment, the cam profile of the cam piece C is continuously changed in the rotation axis direction, and the three-dimensional cam piece C formed by changing the areas of both side surfaces adjacent to the cam profile surface is different. Used, mainly V
Description will be made for the case of manufacturing a valve mechanism for a supply / exhaust valve of a 6-cylinder engine. The same reference numerals indicate the same parts or corresponding parts.

The camshaft manufacturing apparatus according to this embodiment is roughly composed of a plurality of cam pieces C having shaft holes Ca.
Is a device for manufacturing a cam shaft CS (see FIG. 14), each of which is fixed to a shaft S at a predetermined phase, and has a plurality of cam tables each having a holding means 6 for holding each cam piece C. 1 (a to h)
And a heating means 2 for heating the shaft hole Ca of each cam piece C so as to expand the diameter, and the shaft hole Ca of each cam piece C held by the plurality of cam tables 1 (a to h) into the shaft insertion axis center CL.
Between a first position where each cam table 1 (a to h) is positioned so as to be aligned above, and a second position which is displaced away from the first position in the circumferential direction of the shaft insertion axis core CL (X The displacement means 3 for moving in the direction) and the shaft S to insert the shaft S into the shaft holes Ca of the cam pieces C held when the cam tables 1 (a to h) are in the first position. Shaft inserting means 4 for moving the lever in the axial direction thereof. As shown in FIGS. 18 and 19, the camshaft manufacturing apparatus of the present invention includes a heating means main body 25 in which the heating means 2 is supported so as to be able to approach / retract with respect to the cam piece C, and this heating means. The heater block 24 is supported by the main body 25 and abuts against the cam piece C, and the heater 28 is configured to heat the heater block. Further, the elastic body 27 is interposed between the heating means main body 25 and the heater block 24, and the outer shape of the contact portion 24 a of the heater block 24 is
It is formed smaller than the outer shape of the side surface Cf2 that is the contacted portion of the cam piece C. Each cam table 1 (a ~
h) is a holding means 6 (hereinafter, referred to as a holding means for holding each cam piece C).
The clamper 6) and the shaft S corresponding to the shaft hole Ca of each cam piece C held at the predetermined phase at the first position, and the shaft S can be inserted through the side edge to open each cam table 1. The shaft insertion portion 7 is formed so that (a to h) can be extracted from the shaft S inserted at the first position and moved to the second position. Further, in each cam table 1 (a to h) of the camshaft manufacturing apparatus in this embodiment, the holding means 6 is configured to hold each cam piece C at the predetermined phase, and the shaft insertion portion 7 is the first. The second position is formed to open to the side edge on the position side, and the second position is set in a direction orthogonal to the predetermined phase, which is the direction in which the nose Cb of each cam piece C faces. The cam tables 1 (a to h) are arranged in three rows at intervals of 120 degrees in the circumferential direction of the insertion axis center CL of the shaft S according to the phase of the cam piece C fixed to the shaft S. Are radially arranged around the insertion axis center CL. Furthermore, the camshaft manufacturing apparatus according to this embodiment is provided with each camble 1 (a to h).
Each cam table 1 (a of each cam piece C held by
A mechanism (hereinafter, referred to as an X-direction floating mechanism) that allows loose movement in the moving direction (X direction) of
The cam table 1 (a to h) has a mechanism (hereinafter referred to as a Y-direction floating mechanism) that allows the cam table 1 (a to h) to move in a direction (Y direction) orthogonal to the moving direction. An X-direction floating mechanism is provided in the displacement means, and a Y-direction floating mechanism is provided in the holding means, and each cam table is arranged so as to move in a direction orthogonal to the predetermined phase of each cam piece. Both side edges along the moving direction of the table are supported by linear guides. Furthermore, as shown in FIGS. 15 and 16, the camshaft manufacturing apparatus in this embodiment holds the shaft S in a predetermined phase for each cam piece C held in a predetermined phase. A provisional determining means 10 for provisionally determining and a phase determining means 11 for contacting the contact portion Sp of the temporarily determined shaft S and adjusting the phase thereof to determine the phase are provided.

Each cam table 1 (a to h) is composed of a flat plate-like member, and as shown in FIG. 6 and the like, a clamper 6 is provided at a substantially central portion of its upper surface. . As shown in FIG. 6, the clamper 6 includes a pair of clamp arms 60, 60 supported by a linear guide 5 (described later) so as to be movable in a direction (Y direction) orthogonal to the X direction, and both clamp arms. The actuator 61 is provided between 60 and 60, and drives the both so as to approach / retreat them. Both clamp arms 60, 60 are arranged so as to extend in the X direction. The linear guide of the clamper 6 includes a slide rail 62 provided on the upper surface of the cam table 1 (a to h) so as to extend in the Y direction, and the clamp arms 60, 60.
And a slider 63 slidably engaged with a slide rail 62 provided in the middle part of the. The main body of the actuator 61 is provided at the rear end of one clamp arm 60, and the drive rod 61 a that is driven to extend and retract is connected to the rear end of the other clamp arm 60. Outer stoppers 64, 64 for restricting the open position of the clamp arm 60 are provided on both outer sides of the clamp arms 60, 60 in the Y direction, respectively.
An inner stopper 65 that restricts the closed position of the clamp arm 60 is provided between the clamp arms 60. With this configuration, the clamper 6 has a compact size in the Y direction of the cam table 1 (a to h), and the cam table 1 (a to h) is compact.
There is no interference with the linear guides 5 and 5 that support both side edges of h).

The Y-direction floating mechanism includes a clamper 6
Clamp arms 60, 60 are each supported by a linear guide so as to be movable in the Y direction, and an actuator 61 brings both clamp arms 60, 60 close to each other.
The Y-direction length of the inner stopper 65 is provided between the clamp members 67 and 6 so as to drive it back and forth.
6 is slightly smaller than the distance between the clamp arms 60 when the cam piece is held by 6, and is formed to have a clearance Cy in the Y direction as shown in FIG. Actuator 6
Y in the shaft hole of the cam piece held by the retracting drive of 1.
If there is misalignment in the direction, clamp arm 6
Due to the floating structure in which the clamp arms 60, 60 can move in the Y direction by the clearance Cy between 0 and the inner stopper 65, such misalignment can be absorbed and corrected.

At the front ends of both clamp arms 60, 60,
Clamp members 67 and 66 formed according to the shapes of the tip end portion Cb on the nose side of each cam piece C to be held and the base end portion Cc on the opposite side thereof are attached. Since each cam piece C is similarly set and held on each cam table 1 (a to h) in the Y direction substantially orthogonal to the X direction, the respective clamp members 67 and 66 are formed in the same shape. In addition, each cam piece C can be reliably and stably held at an accurate angle. The clamp members 66, 67 are not limited to the shape for holding the cam piece C, and may be formed so as to hold other members as needed. For example, when the camshaft Cs is provided with an angle sensor R (see FIG. 3) for detecting a rotation angle (posture) about the axis thereof, a predetermined cam table corresponding to a position where the angle sensor R is assembled. (For example, 1 (a)
And clamp member 6 of clamper 6 provided in 1 (d))
6, 67 are formed in a shape capable of holding the angle sensor R. In this embodiment, in order to assemble the six cam pieces C and the two angle sensors R to the shaft S, eight cam tables 1 are attached.
(a to h). When it is not necessary to mount the angle sensor R, six cam tables (for example, 1
(B), 1 (c), 1 (e), 1 (f), 1
(G), 1 (h)) may be prepared, or the clamper 6 of a predetermined cam table (1 (a) and 1 (d)) may be emptied.

The shaft insertion portions 7 provided on each of the cam tables 1 (a to h) are notched so as to open to the front edge toward the first position. The width of the shaft insertion portion 7 in the Y direction is set to be slightly larger than the diameter of the shaft S. Then, the X of the shaft insertion portion 7
The length in the direction is set to match the axial hole Ca of the cam piece C so that the shaft S can be inserted together with the axial hole Ca of the cam piece C held by the clamper 6. The shaft insertion portion 7 is used for each cam table 1 (a-
h) is formed so as to open at the front edge toward the first position, so that in each cam table 1 (a to h), the shaft S located between each cam piece C of the cam shaft CS is relatively positioned. It can be moved backward so that it is pulled out and retracted to the second position.

When manufacturing the camshaft CS used for the valve operating mechanism of the supply / exhaust valve of the V-type 6-cylinder engine, in this embodiment, six cam pieces C and two cam pieces C are provided for one shaft. In order to assemble the angle sensor R, there are eight cam tables 1 (a to
h) is prepared. Then, the two cam pieces C are assembled as a set together with the angle sensor R with a phase of 120 degrees around the axis of the shaft S. Therefore, as shown in a plan view in FIG. 3, the cam tables 1 (a), 1
(B), 1 (c) and 1 (d), 1 (e), 1 (f)
And 1 (g) and 1 (h) are respectively the shaft S in plan view.
Are radially arranged around the insertion axis core CL at intervals of 120 degrees toward the insertion axis core CL. That is, the cam tables 1 (a), 1 (b), 1 (c),
1 (d), 1 (e), 1 (f) and 1 (g), 1 (h)
The X direction between each of the first position and the second position has a phase with an interval of 120 degrees in the circumferential direction of the insertion axis core CL of the shaft S. In addition, each cam table 1 (a ~
h) is supported movably in the horizontal direction so that the cam pieces C can be held at predetermined heights and intervals according to the camshaft Cs to be manufactured, and as shown in FIG. Are arranged so as to be stepwise in a side view when in the second position.

FIG. 20 shows a conventional cam table for comparison with this embodiment. When the cam table 1'is in the second position, each cam table 1'is arranged in a straight line in plan view. And for that, each cam table 1 '
The shape of each clamp 6 ′ is configured to hold each cam piece C in a predetermined phase so as to hold the cam piece in a predetermined phase, and the shaft insertion portion 7 ′ has a cam table 1 ′. Each of the shafts S is opened toward the side opposite to the insertion axis CL of the shaft S, and is provided in a constant direction intersecting with the direction displaced by the displacement means. On the other hand, in the present embodiment, as described above, the clampers 6 of the cam tables 1 (a to h) respectively have the nose Cb according to the phase at which the cam pieces C are assembled.
Are oriented in the Y direction and are held in a similar posture, and the direction in which the cam table 1 (a to h) moves between the first position and the second position is the predetermined direction in which each cam piece C is held. Is set in the X direction orthogonal to the phase of, and the shaft insertion portion 7 is formed so as to open to the side edge on the first position side facing the insertion axis CL of the shaft S.
Since each cam piece C is grounded on each cam table 1 (a to h) with a maximum and constant area, it can be held in a more stable state than the conventional technique (see the hatched portion in FIG. 7). See the shaded areas in Figure 20 and
Please compare).

As shown in FIGS. 1 and 3, cam tables 1 (a), 1 (b), 1 (c) and 1 are provided as linear guides 5 on the upper surface of the lower support plate 90 of the base 9. (D),
1 (e), 1 (f) and 1 (g), 1 (h), the cam table 1 at the lowest position in the vertical direction.
A pair of slide rails 50, 50 for supporting both side edges of (a), 1 (d), 1 (g) along the X direction are provided in parallel with the respective X directions at a predetermined height. . Also, the cam tables 1 (a), 1 (b) and 1 (d), 1
As a linear guide 5 on the upper surfaces of (e) and 1 (g),
The cam tables 1 (b) and 1 which are directly adjacent to each other
A pair of slide rails 50, 50 for supporting (c) and 1 (e) and 1 (f) and 1 (h), respectively, are provided parallel to the respective X directions. A slider 51 slidably engaged with the slide rail 50 is provided on the lower surface of each cam table 1 (a to h). With such a configuration, each cam table 1 (a to h)
The shaft hole Ca of the held cam piece C can be moved in each X direction between a first position in which the shaft hole Ca of the cam piece C is aligned with the insertion axis center CL of the shaft S and a second position horizontally separated from the first position. Has become. And each cam table 1
Both side edges along the X direction of (a to h) are linear guides 5, 5
Even if the tip of the shaft S collides with the periphery of the shaft hole Ca of the cam piece C due to misalignment, each cam table 1 (a It is possible to improve the rigidity against the force acting so as to incline.

Further, as shown in FIG. 6, in the vicinity of the shaft insertion portion 7 of each cam table 1 (a to h), the shaft hole Ca of the held cam piece C is inserted into the insertion shaft center CL of the shaft S.
When there is a cam table 1 (a to g) at the first position aligned with the cam table 1 (a to g), the cam tables 1 (b to
~ H) is provided with a receiving member 8 which is interposed between and supports the vicinity of the shaft insertion portion 7. With such a configuration, when the cam tables 1 (a to h) are in the first position, the vertically adjacent cam tables 1 are respectively supported, so that the misalignment of the cam pieces causes the cam pieces C to move.
Each cam table 1 that holds the cam piece C even when the tip of the shaft S collides with the periphery of the shaft hole Ca of
It is possible to improve the rigidity against the force acting to bend (a to h). In addition, each receiving member 8
FIG. 9 (cam table 1
(G) and (h) are omitted in the drawing), when each cam table 1 (a to h) is displaced to the first position, the cam tables 1 (a to h) are vertically aligned and are aligned at the same position on the horizontal plane. It is desirable to arrange so that

It should be noted that this embodiment is not limited to the case of manufacturing the camshaft used for the valve operating mechanism of the supply / exhaust valve of the V-type 6 cylinder engine as described above.
As another embodiment, as shown in a plan view of FIG. 10, for example, it can be applied to the case of manufacturing a camshaft used for a valve operating mechanism of an intake / exhaust valve of an in-line 4-cylinder engine. In such a case, for example, nine cam tables 1
(A to i) are prepared. Cam table 1 (a), 1
(B), 1 (c), 1 (d) and 1 (e), 1 (f),
1 (g), 1 (h), and 1 (i) are shafts S in a plan view.
Are arranged in two rows toward the insertion axis CL with an interval of 90 degrees around the insertion axis CL. Therefore, in this case, the cam tables 1 (a), 1
(B), 1 (c), 1 (d), and 1 (e), 1
X of (f), 1 (g), 1 (h), 1 (i)
The directions are different in phases having a 90 degree interval in the circumferential direction of the insertion axis center CL of the shaft S. As described above, according to the present invention, the required number of cam tables 1 are prepared according to the cam shafts to be manufactured, and the cam tables 1 are arranged in a phase with a predetermined angular interval around the insertion axis center CL of the shaft S in plan view. Arranged. In the embodiment shown in FIG. 10, in order to assemble eight cam pieces C to one shaft S and one angle sensor R to the upper end, nine cam tables 1 (a to i) are installed. Can be prepared. Then, the clamp members 66 and 67 of the clamper 6 provided on the cam table 1 (i) at the uppermost position are formed in a shape capable of holding the angle sensor R.

The displacement means 3 includes the cam tables 1 (a ...
h) an actuator 3 arranged along one side of
0, a slider 31 moved in each X direction by the actuator 30, and each cam table 1 (a
To h), the engaging member 32 is provided on one side edge and is engaged with the slider 31. Actuator 30
As the slider 31 is moved in the X direction by
Each cam table 1 (a to h) provided with the engaging member 32
Are displaced between a first position and a respective second position. Here, the first position means each cam table 1 (a to
h) the shaft hole Ca of the cam piece C held by the clamper 6
Denotes a position aligned with the insertion axis center CL of the shaft S, and the second position means that each cam table 1 (a to h) has the shaft S.
The positions are arranged in a stepwise manner by retracting in the X direction from the insertion axis CL of. The insertion axis CL of the shaft S is inserted into the axial hole Ca axial center of the aligned cam piece C or the axial hole Ca when each cam table 1 (a to h) is moved to the first position. Means the axis of the shaft S to be rotated. And before inserting the shaft S,
It means an extension line of the axis of the shaft S positioned as described later.

The X-direction floating mechanism is, as shown in FIG. 11, an X member which is engaged with the engaging member 32 of the slider 31.
The length in the direction is slightly larger than the length of the engaging member 32 in the X direction, that is, the slider 31 and the engaging member 32 are formed to have a clearance Cx in the X direction. Has been done. When the axial hole Ca of the cam piece C held by the clamper 6 is misaligned in the X direction, the X between the slider 31 and the engaging member 32 is changed.
Depending on the clearance Cx in the direction, the cam table 1 (a ~
Since h) is a floating structure that can move in each X direction, such misalignment can be absorbed and corrected. Then, by the combination of the X-direction floating mechanism and the Y-direction floating mechanism described above, the X-direction and the Y-direction generated in the shaft hole Ca of the cam piece C held on the cam table 1 (a to h) by the clamper 6 are generated. It is possible to absorb and correct misalignment in all directions that have been combined.

As shown in FIG. 1, the heating means 2 is driven close to the upper support plate 91 provided on the support column 92 of the base 9, so that the heating means 2 is brought into contact with the cam piece C. The actuator 21 and the guide rod 23 for driving back and forth so as to retract the cam table 1 (a
To h), each actuator 2 is provided.
A support member 22 that supports a plurality of heating units 2 is connected to the tip ends of one drive rod 21 a and each guide rod 23. The heating means 2 is stepped by the support member 22 so as to correspond to the cam pieces C held by the respective cam tables 1 (a to h) when the respective cam tables 1 (a to h) are in the second position. It is arranged. Each heating means 2 is shown in FIG.
As shown in FIGS. 8 and 19, the heater block 24 that abuts on the cam piece C, the heating means main body 25 supported by the support member 22, and the connecting rod 26 that connects and supports the heater block 24 to the heating means main body 25. And a coil spring 27 as an elastic body interposed between the heater block 24 and the heating means main body 25. Heating means body 2
Reference numeral 5 is provided in parallel with the cam table 1 (a to h) mounted so that the side surface Cf1 serving as the reference surface of the cam piece C contacts.

As shown in FIG. 18, the heater block 24 is provided with a cartridge heater 28, which heats by being supplied with electric power, as a heater at substantially the center of the inside thereof, and is brought into contact with the side surface of the cam piece C. Abutting part 2
4a and a cylindrical portion 24b that is inserted without coming into contact with the shaft hole Ca of the cam piece C are formed. In this embodiment, the side surface C having the smaller area of the three-dimensional cam piece is used.
The f1 serves as a reference surface and is placed so as to contact the cam table 1 (a to h), and the side surface Cf2 having the larger area is positioned so as to face the heater block 24. Abutment 24
As shown in FIG. 19, a is substantially similar to the side surface Cf2 of the three-dimensional cam piece having a large area, and is formed smaller than the outer peripheral edge of the side surface Cf2. By being molded in this manner, even if a burr is formed so as to project on the side surface Cf2 of the cam piece C (not shown), the contact portion 24a can be reliably attached to the side surface Cf of the cam piece C.
It is possible to closely contact the periphery of the shaft hole Ca other than at least the outer peripheral edge of 2 and to abut so as to close the shaft hole Ca. Further, the contact portion 24a substantially has the side surface C of the cam piece C.
A temperature measuring means 29, such as a sheath thermocouple, for measuring the temperature of the portion abutting on f2 is separated from the cartridge heater 28 and is provided on the side face Cf2 of the abutment portion 24a of the cam piece C abutting on the side face Cf2. It is provided so that its tip is located in the vicinity. Each temperature measuring means 29 outputs a measurement result signal to a temperature control device (not shown), and based on this, power supply control is performed so that the temperature of each cartridge heater 28 becomes uniform. Heater block 24
The heat insulating plate 20 is disposed on the surface of the heating means main body 25 side. Further, a step portion 24c with which the head 26a of the connecting rod 26 is engaged is formed at a corner portion of the surface of the heater block 24 on the side where the contact portion 24a is provided, and the heater block 24 and the heat insulating plate are formed. 20, holes 24d and 20a through which the shaft portion 26b of the connecting rod 26 is inserted are provided at the step portion 24c.
Are formed so as to be continuous with each other. And
In order to correspond to the holes 24d, 20a, the heating means main body 25 has a stepped portion 25a for receiving one end of the coil spring 27,
A hole 25b through which the connecting rod 26 is inserted is formed. The connecting rod 26 has a heater block 24 at one end thereof.
It has a head 26a that is engaged with the stepped portion 24c and a screw portion 26c at the other end with which the adjust nut 260 and the lock nut 261 are screwed. Holes 24d, 20 in the heater block 24 and the heat insulating plate 20
The inner diameter of "a" and the outer diameter of the shaft portion 26b of the connecting rod 26 have a relationship that allows the heater block 24 to be inclined with respect to the heating means main body 25. The coil spring 27 is formed of a heat resistant material. By loosening the lock nut 261 of the connecting rod 26 and rotating the adjustment nut 260, the elastic force of the coil spring 27 (or the elastic force of the coil spring 27 that supports the heater block 24 to urge the side face Cf2 of the cam piece C (or,
It can be said that the spring force is applied to the heating means main body 25).
Can be adjusted. By driving the drive rod 21a of the actuator 21 to extend, the support member 22
The heater block 24 of each heating means 2 supported by the supporting member 2 is lowered to come into contact with the side surface Cf2 of each cam piece C, and the drive rod 21a is driven to retract.
The heater block 24 supported by 2 is lifted and retracted from the cam piece C. It should be noted that in FIG. 1, the heating means 2 corresponding to the cam tables 1f and 1g are omitted.

In the heating means 2 thus constructed, the side surface Cf2 of the cam piece C, which is in contact with the contact portion 24a of the heater block 24, is formed so as to be inclined with respect to the heating means main body 25. Even so, the posture of the heater block 24 is adapted and changed according to the inclination,
The coil spring 27 interposed between the heater block 24 and the heating means main body 25 absorbs. Further, as described above, even when the burr is formed so as to project on the side surface Cf2 of the cam piece C, the contact portion 24a is formed smaller than the side surface Cf2 of the cam piece C, and thus the burr is formed. There is no contact. Therefore, the heater block 2
The contact portion 24a of No. 4 surely comes into close contact with at least the periphery of the shaft hole Ca of the side surface Cf2 serving as the contacted portion of the cam piece C
The cylindrical portion 24b of the heater block 24 can be abutted so as to close the shaft hole Ca while being inserted. Therefore, in the present invention, the heat generated by the cartridge heater 28 is surely transferred to the cam piece C via the contact portion 24a, and the cylindrical portion 24 inserted into the shaft hole Ca in the closed state is provided.
By the radiant heat from b, the shaft hole Ca of the cam piece C can be heated to a predetermined temperature so as to accurately expand the diameter.

As shown in FIG. 4, the insertion means 4 includes a clamper 40 for temporarily supporting one end of the shaft S, and a clamper 40.
A positioning mechanism 41 for positioning the axial position of the shaft S temporarily supported by the cam table 1 (a to h) supporting the other end of the positioned shaft S and the cam piece when the cam table 1 (a to h) is in the first position. A support mechanism 42 that guides the shaft S into the axial hole Ca of C and an insertion mechanism 43 that displaces the shaft S in the axial direction and inserts the shaft S into the axial hole Ca of the cam piece C are provided.

As shown in the bottom view of FIG. 15, the clamper 4
Reference numeral 0 denotes a fork-shaped holding portion 40a that engages with and supports the stepped portion Sb of the shaft S.
A pin 100 for temporarily determining and holding the phase around the shaft S of the shaft S by being inserted into the hole Sc of the shaft S is provided in the center between the positions as the temporary setting means 10. In this embodiment, the pin 100 is the bolt 101.
It is fixed to the clamper 40 by. Shaft S
When the stepped portion Sb is engaged with the holding portion 40a of the clamper 40 and the pin 100 is inserted into the hole Sc, the pin is held in a state in which the phase around the axis is provisionally determined.

As shown in FIG. 14, the axial positioning mechanism 41 has a reference center pin 410 provided on the lower surface of the bracket 440 of the ascending / descending movement plate 44 and a state in which the clamper 40 is provisionally determined with respect to the reference center pin 410. And an actuator 411 that presses one end surface of the shaft S supported by and engages the concave portion Sa. The reference center pin 410 is supported by a bearing 441 provided on the bracket 440 so as to be rotatable about its axis. The actuator 411 is connected to the clamper 40 via the actuating member 412. The operating member 412 includes
A guide rod 413 that is inserted into the bracket 440 of the up-and-down moving plate 44 is provided. In this embodiment,
When the reference center pin 410 is pressed against the concave portion Sa of the one end surface of the shaft S by the retracting drive of the actuator 411, the shaft S is positioned in the axial direction. The shaft S positioned in the axial direction has a gap (fitting) for fitting the pin 100 into the hole Sc, so that the shaft S rotates slightly around the axis, that is, the phase changes. However, it is tentatively decided by being held with a substantially predetermined phase around the axis.

The support mechanism 42 includes an actuator 420 provided on the up-and-down moving plate 44, and a center rod 422 provided on a drive rod 420a of the actuator 420 via a bracket 421. The center rod 422 has a smaller diameter than the shaft holes Ca of the cam pieces C supported by the respective cam tables 1 (a to h), passes through the shaft holes Ca of all the cam pieces C, and has one end supported and positioned by the positioning mechanism 41. The length is set so that it can be pressed against the other end of the shaft S.

The insertion mechanism 43 includes a reference center pin 410 of the positioning mechanism 41 and a center rod 422 of the support mechanism 42.
And an actuator 420 for moving in the axial direction is used to move up and down the moving plate 44, and slide rails 430 extend vertically in the pair of support columns 92 that are erected on the base 9. It is provided as
A slider 431 provided on the up-and-down moving plate 44 is slidably engaged with the slide rail 430. A ball screw shaft 433, which is driven to rotate about an axis by a motor 432, is provided in parallel with the slide rail 430 on the base 9, and a ball screw screwed to the ball screw shaft 433 is mounted on the elevating and moving plate 44. A nut 434 is provided. By driving the motor 432, the ball screw shaft 433 is rotated around its axis, and together with the ball screw nut 434 screwed onto the ball screw shaft 433, the reference center pin 410 and the center rod 422 that positionally hold both ends of the shaft S are axially moved. To move.

As shown in FIG. 17, the phase determining means 11 is formed so as to be brought into contact with at least one of the tooth bottom or tooth tip of the spline Sp of the shaft S so as to be engaged in a complete contact state without a gap. Rollers 110, 110 as a pair of phase determining members, and each roller 110
Is provided between the clamp arms 111 and 111 for supporting the
An actuator 112 that is driven to move back and forth is provided, and both clamp arms 111, 111 are movably supported by a linear guide 113 so as to open and close to form a floating mechanism. Laura 1
In the case of the embodiment shown in FIG. 17, 10 is the shaft S
The cross-section is formed in a wedge shape so as to engage with one tooth tip of each spline Sp and two tooth bottoms adjacent to both sides thereof in a complete contact state. The clamp arm 111 supports the rollers 110 so that they are positioned on an imaginary line extending through the central axis in the radial direction of the shaft S. The main body of the actuator 112 is provided at the rear end of one clamp arm 111, and the drive rod 112a that is driven to extend and retract is the other clamp arm 111.
1 is connected to the rear end. Clamp arm 111, 1
Outer stoppers 114, 114 for restricting the open position of the clamp arm 111 are respectively provided on both outer sides of 11.

The phase determining means 11 configured as described above
Is provided on a rotation support plate 90a rotatably provided on the lower support plate 90 about an axis. Then, as shown in FIG. 17, the rotation support plate 90a is provided with an adjusting mechanism 115 for adjusting the position of the rotation support plate 90a in the rotation direction about the shaft S. The adjustment mechanism 115
This is for adjusting the position of the roller 110 around the axis of the shaft S so as to correspond to the teeth of the spline Sp of the shaft S that determines the phase. In the case of this embodiment, the bracket provided on the rotation support plate 90a 116 and the bracket 117 provided on the lower support plate 90 from each other.
It is composed of a bolt 118 screwed so as to be close to each other. By rotating the bolt 118 around the axis to change the distance between the brackets 116 and 117, the rotational position of the rotation support plate 90a can be adjusted.

Although not shown in FIG. 17 in this embodiment, a plurality of phase determining means 11, 11 position the rollers 110 at different heights, as conceptually shown in FIG. Is provided. With this configuration, it is possible to determine the phase corresponding to the shafts S having different lengths or the shafts S having different positions of the splines Sp. In addition, FIG.
It should be noted that the phase determining means 11 is omitted in FIGS.

The shaft S is attached to the pin 100 of the temporary setting means 10.
By inserting the hole Sc as a provisionally determined portion of the shaft 110, the roller 110 of the phase determining means 11 can contact and engage with the tip or bottom of the spline Sp at a predetermined position. The phase around the axis of S can be easily provisionally determined. However, the temporarily determined shaft S may be in a state in which the phase around the axis of the spline Sp is slightly deviated from the predetermined phase due to the clearance between the hole Sc and the pin 100 of the temporarily determining means 10. There is a nature. Therefore, in the present invention, the actuator 112 of the phase determining unit 11 is driven to retract, and the rollers 110, 110 are held in contact with and sandwiched by the spline Sp of the shaft S held in a state in which the phase around the axis is temporarily determined. I am going to do it. The reference center pin 410 of the positioning mechanism 41 and the center rod 422 of the support mechanism 42, which hold the recesses Sa at both ends of the shaft S, respectively, are respectively provided with the bearing 44.
Since the roller 110 is rotatably supported by the shaft 1, the roller 110 is brought into contact with the spline Sp, so that the shaft S, which is in a phase-shifted state by provisional determination, is rotated around the axis to cause the shift. Adjust to correct. Therefore, the shaft S can be accurately and easily set to a predetermined phase around the axis. And the tentatively decided shaft S
When determining the phase of the pair of rollers 110, 110 supported by the floating mechanism,
Therefore, the roller 110 does not act to press and bend the shaft S in the radial direction.

In the camshaft manufacturing apparatus configured as described above, as shown in a plan view in FIG. 2, a safety fence 93 is provided so as to surround the periphery thereof. With each cam table 1 (a to h) retracted to the second position, an operator from outside the safety fence 93 puts the cam piece C on the clamper 6 of each cam table 1 (a to h) and its nose Cb. It can be easily set so as to be in the same direction as each Y direction. The present invention is not limited to this embodiment. For example, in this embodiment, the case where a plurality of cam pieces are assembled to the cam shaft S at the same time is shown, but the present invention can be applied to a case where a single cam piece is assembled to the cam shaft S in order. Further, the cam piece assembled on the shaft S is not limited to the three-dimensional cam.

Next, the operation of the camshaft manufacturing apparatus of the present invention will be described based on the case where it is configured as shown in FIGS. 1 to 19. In the camshaft manufacturing apparatus according to this embodiment, a plurality of cam pieces C are roughly provided.
Insert the shaft S into each shaft hole Ca of
Are fixed to the shaft S in a predetermined phase,
Each cam piece C in the circumferential direction of the shaft insertion axis CL
Of each cam piece C at the second position displaced away in the X direction orthogonal to the above-mentioned predetermined phase.
(A to h) Hold the clamper 6 on the above in the predetermined phase,
At the first position where the shaft holes Ca of the cam pieces C are aligned on the insertion axis CL of the shaft S, the cam tables 1 (a to h) are placed.
To move the shaft S into each shaft hole Ca of each cam piece C.
Is inserted and fixed to obtain the cam shaft CS, and the cam pieces C are respectively attached to the clamper 6 of the cam table 1 (a to h).
And each cam table 1 (a to h) is moved backward to the second position, so that each cam table 1 (a to h) is relatively extracted from the shaft S and the cam shaft CS is extracted. is there. Furthermore, in the camshaft manufacturing apparatus of the present invention, in addition to the above-described configuration, each cam piece C is moved by moving the cam shaft S in the axial direction to separate the cam piece C from the cam table 1 (a to h). The cam table 1 (a to h) is released. Note that, here, for convenience, the cam table 1
Although it is described that the cam pieces C are held by the respective clampers 6 of (a to h), in the case of the embodiment shown in FIGS. 1 to 9, the cam table 1 (a
~ H) a predetermined cam table (for example, 1
(B), 1 (c), 1 (e), 1 (f), 1
(G) and 1 (h) are held by the respective clampers 6, and the other cam tables (for example, 1 (a) and 1 (d)) are held by the angle sensor R.

The camshaft CS using the device of the present invention
In manufacturing the cam table, first, each cam table 1 (a
To h) are separated from the insertion axis CL of the shaft S by a predetermined distance and are positioned at the second step-like position. In this state, the cam tables 1 (a), 1 (b), 1 on which workers are arranged from the outside of the safety fence 93, respectively.
(C) and 1 (d), 1 (e), 1 (f) and 1 (g), 1
The cam piece C or the angle sensor R is set to a predetermined phase on each clamper 6 in (h). In the manufacturing apparatus used in this embodiment, the cam tables 1 (a to h) are radially arranged in three rows around the insertion axis CL of the shaft S according to a predetermined phase in which the cam pieces C are assembled. Therefore, the cam tables 1 (a), 1 (b), 1 (c) of each row are
And 1 (d), 1 (e), 1 (f) and 1 (g), 1 (h)
On the other hand, the noses Cb of the cam pieces C can be set in the same direction. As described above, when the angle sensor is provided on the shaft S as necessary, the angle sensor R is set to the predetermined cam table 1
The clamper 6 of (a) and 1 (h) is set. Then
The actuator 61 of the clamper 6 is driven to bring the clamp arms 60, 60 close to each other, and the clamp member 66,
67 holds the nose Cb and the base end Cc of the cam piece C. The thus held cam pieces C are held in a state in which the nose Cb faces in the Y direction which is substantially orthogonal to the respective X directions. Each cam piece C has a cam table 1 on which a shaft insertion portion 7 is formed.
With respect to (a to h), each clamper 6 is stably held in a state of being in contact with each other with a maximum constant area.

Thereafter, with each cam table 1 (a to h) maintained in the second position, the drive rod 21a of the actuator 21 of the heating means 2 is extended and driven, and each heater block 24 is brought into contact with each cam piece C. Let it heat. The shaft hole Ca of the cam piece C is slightly smaller than the diameter of the shaft S at room temperature before heating, and for example, the difference between the diameters of the two is about 3.
It is set to be about 0 μm. Then, when the cam piece C is heated to, for example, room temperature + 250 ° C. by the heater 20, the diameter of the shaft hole Ca becomes 3 times larger than that of the shaft S.
It becomes larger by about 0 μm. By enlarging the shaft hole Ca, the shaft C can be inserted into the shaft hole Ca without resistance. As described above, since the coil spring 27 is interposed between the heater block 24 and the heating means main body 25, and the contact portion 24a is formed smaller than the side surface Cf2 of the cam piece C, each heater block 24 is formed. Cylindrical part 24
In the state where b is inserted into the shaft hole Ca, the contact portions 24a are surely brought into close contact with the periphery of the shaft hole Ca of at least the outer peripheral edge of the side surface Cf2 of each cam piece C in a uniform area so that the shaft hole Ca is Abut to close. Then, electric power is appropriately supplied to each cartridge heater 28 based on the signal from the temperature measuring means 29. Therefore, the heat generated by the cartridge heaters 28 is evenly transmitted to the cam pieces C via the contact portions 24a, and is emitted as radiant heat from the cylindrical portion 24b in the shaft hole Ca, so that the shaft hole Ca is accurately expanded in diameter. As described above, each cam piece C is uniformly heated at an appropriate temperature. When the shaft hole Ca of the cam piece C is heated so as to be appropriately expanded in diameter, the supply of electric power to the cartridge heater 28 of the heating means 2 is stopped, the drive rod 21a of the actuator 21 is retracted, and it is in the second position. The heating means 2 is separated from and retracted from each cam piece C. continue,
By driving the actuator 30 of the displacement means 3 to move the cam piece C held by the clamper 6 forward in the X direction,
The cam table 1 (a to h) is positioned at the position, and the shaft holes Ca thereof are aligned with the insertion axis center CL of the shaft S, respectively.

On the other hand, by the time each cam table 1 (a to h) holding the cam piece C is moved to the first position, the shaft 4 is moved in the uppermost position while the elevating and moving plate 44 of the insertion means 4 is in the uppermost position. The stepped portion Sb of S is held by the clamper 40, and the pin 100 is inserted into the hole Sc to temporarily determine the phase around the axis. In the above-mentioned device, the roller 110 of the phase determining means 11 abuts and engages with the tip or bottom of the spline Sp at a predetermined position only by inserting the hole Sc of the shaft S into the pin 100 of the provisional determining means 10. The phase around the axis of the shaft S can be easily provisionally determined and held so that they can be matched. The shaft S when provisionally determined in this way has the hole Sc and the pin 1 of the provisional determination means 10.
There is a possibility that the phase around the axis of the spline Sp may be slightly deviated from the predetermined phase due to the clearance existing between 00 and 00. Next, the positioning mechanism 4
No. 1 actuator 411 is driven to press the concave portion Sa of the one end surface of the shaft S against the reference center pin 410 to position the shaft S in the axial direction, and the actuator 420 of the support mechanism 42.
The drive rod 420a is driven to retract. As a result, the center rod 422 passes through the shaft hole Ca of each cam C and the shaft insertion portion 7 of the cam table 1 (a to h) and is pressed against the recess Sa of the other end surface of the shaft S, so that the shaft S becomes the reference center pin. It is axially positioned and held between 410 and the center rod 422.

In this state, when the motor 432 of the insertion mechanism 43 of the insertion means 4 is driven to lower the elevating / lowering plate 44, the shaft S positioned between the reference center pin 410 and the center rod 422 causes the cam piece C to move. Shaft hole C
a and each of the shaft insertion portions 7 of the cam table 1 (a to h). At this time, even when the shaft hole Ca of the cam piece C held by the clamper 6 is misaligned, a clearance Cy is provided between the clamp arm 60 and the inner stopper 65, and the slider 31 is engaged. Member 32
A cam piece C held on the cam table 1 (a to h) by the clamper 6 with a simple structure in the X and Y direction floating mechanism in which a clearance Cx is formed between
It is possible to absorb and correct the misalignment generated between the shaft hole Ca and the shaft S in the X direction, the Y direction, and the XY compound direction. Further, in this embodiment, both side edges of each cam table 1 (a to h) along the X direction are supported by the linear guides 5, and the receiving member of each cam table 1 (a to h) is also supported. Since the 8 are aligned vertically, the rigidity is improved. Therefore, the relative displacement (center misalignment) between the shaft center of the shaft S and the shaft hole Ca of each cam piece C causes the cam piece C to move. Even when the tip of the shaft S collides with the periphery of the shaft hole Ca, the cam tables 1 (a to h) are sufficiently tilted and deflected. Therefore, in the state where the cam piece C is stably and surely held on the cam table 1 (a to h) without tilting, the shaft S is inserted into each shaft hole Ca by absorbing the misalignment. Inserted up to the specified axial position .

When the temporarily determined shaft S is inserted by the insertion means 4 to a predetermined axial position, the spline Sp is positioned at a height corresponding to the roller 110 of the phase determination means 11. Therefore, when the actuator 112 is driven to retract and the clamp arms 111 and 111 are closed so as to approach each other, the rollers 110 and 110 come into contact with the spline. At this time, even when one roller 110 comes into contact with the spline Sp earlier than the other roller 110, that is, one-sided contact occurs, one roller 110 is kept until the other roller 110 comes into contact with the spline Sp by the floating mechanism. The roller 110 presses the shaft S in the radial direction because the rollers 110, 110 are engaged with the spline Sp so as to be sandwiched by the spline Sp with a uniform force and are in a complete contact state. Bending action is prevented. Then, both rollers 110, 1 whose spline Sp has a wedge-shaped cross section.
The shaft S, which is abutted in a complete contact state so as to be sandwiched by 10, is held by the reference center pin 410 of the positioning mechanism 41 and the center rod 422 of the supporting mechanism 42 in which the recesses Sa on both end surfaces are supported by the bearing 441. By doing so, the shaft S in the provisionally determined state is adjusted around the axis and easily determined to a predetermined phase with high accuracy. When the shaft S is determined to have a predetermined phase around the axis and is inserted into the shaft hole Ca of each cam piece C, air is blown onto each cam piece C to cool it. The cam piece C is
The shaft hole Ca contracts to the original diameter smaller than the shaft S,
It is accurately fixed to the shaft S at a predetermined axial position and a predetermined phase around the axis.

After that, the actuator 61 of the clamper 6
Is driven to separate the clamp arms 60, 60 from each other, and the holding of the cam piece C by the clamp members 66, 67 is released. Then, in this embodiment, the insertion means 4
The motor 432 of the insertion mechanism 43 of the
4 is slightly lifted to separate the cam pieces C fixed to the shaft S from the cam tables 1 (a to h) so as to float. From this state, the actuator 30 of the displacement means 3 is driven to move the cam table 1 to the second position.
(A to h) are moved backward. Each cam table 1 (a ~
Since the shaft insertion portion 7 of (h) is provided so as to be open at the edge portion of the shaft S facing the insertion axis CL, the shaft S is relatively extracted from the shaft insertion portion 7. At this time, since the cam pieces C of the cam shaft CS are separated from the cam tables 1 (a to h), the cam pieces C are respectively separated from the cam table 1 (a to h).
The camshaft CS can be reliably taken out without rubbing against (a to h). Then, when the cam table is moved backward to the second position, the cam shaft CS can be taken out, and at the same time, the cam pieces C to be assembled in the next manufacturing cycle are attached to the respective cam tables 1 (a to h).
, The manufacturing cycle time can be shortened as compared with the conventional technique.

[0042]

According to the present invention, with a simple construction, the cam piece is heated uniformly and accurately to expand the diameter of the shaft hole, and the shaft is inserted through the shaft hole of the cam piece and fixed. It is possible to provide a camshaft manufacturing apparatus capable of assembling the above.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a camshaft manufacturing apparatus of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view for explaining the arrangement of the cam table of the camshaft manufacturing apparatus of the present invention.

FIG. 4 is a side view of the camshaft manufacturing apparatus of the present invention.

5 is an explanatory view showing a state in which the shaft is inserted into the cam piece from the state of FIG.

FIG. 6 is a plan view for explaining a cam table and a displacement means for displacing the cam table in the X direction in the camshaft manufacturing apparatus of the present invention.

FIG. 7 is a partially enlarged view for explaining a ground area of a cam table and a held cam piece of the cam shaft manufacturing apparatus according to the present invention.

FIG. 8 is a partially enlarged plan view for explaining a clamper and a notch provided on the cam table.

FIG. 9 is a side view for conceptually explaining a part of a state where the cam tables are assembled and stacked at the first position.

FIG. 10 is a plan view for explaining another embodiment of the camshaft manufacturing apparatus of the present invention.

FIG. 11 is an enlarged plan view of an essential part for explaining an X-direction floating mechanism.

FIG. 12 is an enlarged plan view of an essential part for explaining a Y-direction floating mechanism.

FIG. 13 is a front view (a) and a side view (b) showing an embodiment of a shaft whose phase around an axis is determined according to the present invention.

FIG. 14 is a partially enlarged cross-sectional view showing an embodiment of a clamper of an insertion means and an axial positioning mechanism.

FIG. 15 is a bottom view of FIG.

FIG. 16 is a partial front view showing a case where a plurality of phase determining means are provided so that the rollers are located at different heights.

FIG. 17 is a plan view showing only one of the phase determining means.

FIG. 18 is a front view showing an embodiment of the heating means of the present invention.

FIG. 19 is a bottom view of FIG. 18.

FIG. 20 is a plan view for explaining a configuration of a clamper and a cutout provided in a conventional cam table.

[Explanation of symbols]

C cam piece Ca shaft hole Cb nose Cf1 Side of camshaft (contacted part) S shaft CL shaft insertion axis 1 (a to h) cam table 2 heating means 3 displacement means 4 Insertion means 5 Linear guide 6 clamper 7 Shaft insertion part 8 Receiving member 24 heater block 24a contact part 25 Heating means body 27 Coil spring (elastic body)

Claims (3)

[Claims] 1. A camshaft manufacturing apparatus comprising a plurality of cam pieces each having a shaft hole fixed to a shaft at a predetermined phase, wherein a cam table holding the cam piece and a shaft hole of the cam piece are expanded in diameter. The heating means is provided with a heating means and an insertion means for inserting the shaft into the shaft hole of the expanded cam piece, and the heating means is provided with a heater block that abuts against the cam piece. Camshaft manufacturing equipment. 2. The apparatus for manufacturing a camshaft according to claim 1, wherein the heater block is supported by a heating means main body that can approach and leave the cam piece via an elastic body. 3. The camshaft manufacturing apparatus according to claim 1, wherein the contact portion of the heater block is formed smaller than the contacted portion of the cam piece.