JP2012211570A - Apparatus and method for manufacturing cam carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately machine a cam hole in a cam carrier.SOLUTION: The cam carrier 13 is installed on a workpiece supporting table 41 provided with a plurality of reference pads 42. The reference pads 42 come in contact with through hole parts in which bolts are inserted when the cam carrier 13 is assembled. A clamp cylinder is operated then and the cam carrier 13 is pressed to the reference pads 42. Height dimensions of the reference pads 42 are adjusted based on deformed shapes formed when the cam carrier 13 is assembled in a cylinder head body, that is, the cam carrier 13 can be deformed similarly upon assembling by pressing the cam carrier 13 to the reference pads 42. A reamer 58 is advanced under the condition that the carrier cam 13 is deformed, consequently the cam hole 19 is machined in the cam carrier 13. Thus, the cam hole 19 can be highly accurately machined.

Description

  The present invention relates to a cam carrier manufacturing apparatus and a manufacturing method for forming a cam hole in a cam carrier.

  In order to simplify the machining operation and assembly operation of a complicated cylinder head having a valve operating mechanism, a split type cylinder head that divides the cylinder head into a cylinder head body and a cam carrier has been proposed (for example, see Patent Document 1). ). A cam hole for supporting the camshaft is formed in the cam carrier constituting the cylinder head. However, since the cam carrier is deformed when assembled to the cylinder head body, it is necessary to process the cam carrier while reproducing the deformation state of the cam carrier in order to process the cam hole with high accuracy. . Therefore, drilling is carried out under the condition that the cam carrier is deformed by assembling the cam carrier to the cylinder head body.

Japanese Patent Publication No. 6-8603

  However, when assembling the cam carrier to the cylinder head main body, it is necessary to tighten a plurality of bolt members, which has been a factor in increasing the work cost in drilling. In addition, fastening the bolt member for drilling processing causes wear of the bolt member and screw hole, and thus improvement of the drilling method has been demanded.

  An object of the present invention is to process a cam hole with high accuracy in a cam carrier without increasing the work cost.

  The cam carrier manufacturing apparatus of the present invention is a cam carrier manufacturing apparatus for forming a cam hole for supporting a cam shaft in a cam carrier fixed to a cylinder head body using a bolt member, wherein the cam carrier is installed. A plurality of support protrusions that are provided on the workpiece support base and support the bolt holes of the cam carrier to which the bolt members are guided, and an arm member that contacts the bolt holes from the opposite side of the support protrusions A plurality of clamp mechanisms that press the bolt hole portions against the support convex portions, and a state where the bolt holes are pressed by the clamp mechanism to deform the cam carrier, and the rotary tool is moved in the axial direction. And a tool driving mechanism for machining the cam hole.

  The cam carrier manufacturing apparatus according to the present invention is characterized in that at least one of the support protrusions is different in height from the other support protrusions.

  In the cam carrier manufacturing apparatus of the present invention, a thin plate member is provided between the workpiece support base and the support convex portion, and the height dimension of the support convex portion is adjusted by changing the thin plate member. Features.

  The cam carrier manufacturing method of the present invention is a cam carrier manufacturing method in which a cam hole for supporting a camshaft is formed in a cam carrier fixed to a cylinder head body using a bolt member, and a plurality of support convex portions An installation step in which the cam carrier is installed on a workpiece support base, and the bolt hole portion of the cam carrier through which the bolt member is guided is supported by a plurality of support projections, and the bolt from the opposite side of the support projections A pressing step of pressing the bolt hole portion of the cam carrier against the support convex portion by a plurality of clamp mechanisms provided with arm members that contact the hole portion, and the cam carrier is deformed by pressing the bolt hole portion by the clamp mechanism. A machining step for machining the cam hole by moving the rotary tool in the axial direction under the condition And features.

  According to the present invention, the cam hole is machined in the cam carrier by moving the rotary tool in the axial direction under a state where the bolt hole portion of the cam carrier is pressed against the support convex portion by the clamp mechanism. Thus, the cam hole can be processed while the cam carrier is deformed, and the roundness of the cam hole can be increased. In addition, since the clamp mechanism is used, the cam carrier can be deformed without complicated work, and the work cost can be suppressed.

It is a fragmentary sectional view which shows the structure of a cylinder head. It is an exploded view which shows the structure of a cylinder head. (a) is a top view which shows the cam carrier of FIG. 2 from upper direction, (b) is a bottom view which shows the cam carrier of FIG. 2 from the downward direction. These are the top views which show the manufacturing apparatus of the cam carrier which is one embodiment of this invention. It is sectional drawing which shows a manufacturing apparatus along the AA line of FIG. It is a top view which shows the manufacturing apparatus of the state in which the cam carrier was installed. It is sectional drawing which shows a cam carrier and a manufacturing apparatus along the AA line of FIG. (a)-(c) is explanatory drawing which shows the procedure of the manufacturing method of the cam carrier which is one embodiment of this invention. (a) is the schematic which shows the cam carrier after processing a cam hole by itself, (b) is the schematic which shows the state which assembled | attached the cam carrier to the cylinder head main body.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial cross-sectional view showing the configuration of the cylinder head 10. FIG. 2 is an exploded view showing the configuration of the cylinder head 10. As shown in FIGS. 1 and 2, a cylinder head 10 which is a component of an engine includes a cylinder head body 11 to which an intake valve and an exhaust valve (not shown) are assembled, and a plurality of carrier bolts ( And a cam carrier 13 fastened using a bolt member 12. That is, the illustrated cylinder head 10 is a split cylinder head constituted by the cylinder head body 11 and the cam carrier 13. The cam carrier 13 is formed with a through hole 14, and the cylinder head body 11 is formed with a screw hole 15 that faces the through hole 14. When the cam carrier 13 is assembled to the cylinder head body 11, the carrier bolt 12 passes through the through hole 14 and is tightened against the screw hole 15.

  The cam carrier 13 that supports the camshaft 16 includes a carrier body 17 and a cam cap 18 that is assembled to the carrier body 17. The carrier body 17 and the cam cap 18 are formed with semicircular bearing portions 17a and 18a, and a cam hole 19 for supporting the camshaft 16 is formed by the opposing bearing portions 17a and 18a. The journal portion 16 a of the camshaft 16 is sandwiched between the carrier body 17 and the cam cap 18 and is rotatably supported by the cam hole 19 of the cam carrier 13. The cam cap 18 has a through hole 20, and the carrier body 17 has a screw hole 21 that faces the through hole 20. When the cam cap 18 is assembled to the carrier body 17, the cap bolt 22 passes through the through hole 20 and is tightened against the screw hole 21.

  3A is a plan view showing the cam carrier 13 in FIG. 2 from above, and FIG. 3B is a bottom view showing the cam carrier 13 in FIG. 2 from below. As shown in FIGS. 3A and 3B, the carrier body 17 of the cam carrier 13 has two frames 30 a and 30 b that are parallel to the axial direction of the camshaft 16, and the axial direction of the camshaft 16. Has three frames 30c to 30e orthogonal to each other. In addition, two cam caps 18 are attached to the three frames 30c to 30e orthogonal to the camshaft 16, and the two camshafts 16 are supported by the three frames 30c to 30e. Further, each of the frames 30a to 30e is formed with a through hole 14 for guiding the carrier bolt 12, and smooth surfaces 31a and 31b are formed around the front and back opening ends of the through hole 14. ing. A through hole portion (bolt hole portion) 32 is formed by the through hole 14 and the smooth surfaces 31a and 31b. An outer frame is formed by the four frames 30 a to 30 c and 30 e arranged on the outer side, and this outer frame substantially matches the outer edge shape of the cylinder head body 11.

  FIG. 4 is a plan view showing a manufacturing apparatus 40 for the cam carrier 13 according to one embodiment of the present invention. FIG. 5 is a sectional view showing the manufacturing apparatus 40 along the line AA in FIG. In FIG. 5, a part of the configuration shown in FIG. 4 is omitted. As shown in FIGS. 4 and 5, the manufacturing apparatus 40 includes a work support base 41, and the work support base 41 is provided with a plurality of reference pads (support convex portions) 42. The reference pad 42 assembled to the work support base 41 using the fastening bolts 43 includes a pad main body 44 having a contact surface 44a on the upper portion and a thin plate-like shim (thin plate member) 45. In this manner, the shim 45 is sandwiched between the work support base 41 and the pad main body 44, and the height position of the contact surface 44a with respect to a predetermined reference height position can be changed by changing the thickness of the shim 45. It is possible to adjust. These reference pads 42 are attached at positions corresponding to the through holes 32 of the cam carrier 13. That is, the contact surface 44a of the reference pad 42 is disposed so as to face the through hole 14 and the smooth surfaces 31a and 31b of the cam carrier 13. Further, a knock pin 46 protruding upward from the contact surface 44a is fixed to the reference pad 42 arranged diagonally.

  As shown in FIGS. 4 and 5, the work support base 41 is provided with a rotating clamp cylinder 50 and a tilting clamp cylinder 51 adjacent to each reference pad 42. The rotation type clamp cylinder (clamp mechanism) 50 has a rotation arm (arm member) 53 connected to a hydraulic cylinder 52, and a pressing member 54 is fixed to the tip of the rotation arm 53. Yes. As shown by the arrow α in FIG. 5, by lowering the turning arm 53, the turning arm 53 can be turned as shown by the arrow α in FIG. 4. That is, the rotating arm 53 is lowered while rotating so that the pressing member 54 approaches the contact surface 44 a of the reference pad 42. The tilt type clamp cylinder (clamp mechanism) 51 has a tilt arm (arm member) 56 connected to the hydraulic cylinder 55, and a pressing member 57 is fixed to the tip of the tilt arm 56. . By operating the hydraulic cylinder 55, the tilting arm 56 of the clamp cylinder 51 tilts so that the pressing member 57 approaches the contact surface 44a of the reference pad 42. The hydraulic cylinders 52 and 55 may be air cylinders.

  As shown in FIGS. 4 and 5, the manufacturing apparatus 40 is provided with a tool drive mechanism 59 including a pair of reamers (rotating tools) 58 for cutting the cam hole 19 in the cam carrier 13. Yes. The tool drive mechanism 59 incorporates an electric motor and a hydraulic cylinder (not shown) so that the reamer 58 can be moved back and forth in the axial direction while rotating.

  FIG. 6 is a plan view showing the manufacturing apparatus 40 with the cam carrier 13 installed. FIG. 7 is a sectional view showing the cam carrier 13 and the manufacturing apparatus 40 along the line AA in FIG. In FIG. 7, a part of the configuration shown in FIG. 6 is omitted. FIGS. 8A to 8C are explanatory views showing the procedure of the manufacturing method of the cam carrier 13 according to one embodiment of the present invention. 8B and 8C indicate the clamping force of the clamp cylinders 50 and 51. As shown in FIGS. 6, 7, and 8 (a), the cam carrier 13 is installed on the work support base 41 so that the through hole 32 of the cam carrier 13 is in contact with the contact surface 44 a of the reference pad 42. . That is, the cam carrier 13 is installed on the work support base 41 so that the contact surface 44a of the reference pad 42 contacts the smooth surface 31b. In this installation step, knock pins 46 provided on some reference pads 42 are inserted into the through holes 14 of the cam carrier 13 so that the cam carrier 13 is positioned with respect to the workpiece support base 41. ing. In addition, a pilot hole 60 is processed in advance at a portion where the cam hole 19 of the cam carrier 13 is formed.

  Subsequently, as shown in FIGS. 6, 7, and 8 (b), by operating the clamp cylinders 50, 51, the pressing members of the rotating arm 53 and the tilting arm 56 are lowered to the reference pad 42. On the other hand, the cam carrier 13 is pressed (pressing step). Here, in each reference pad 42 installed on the work support base 41, the height of the contact surface 44a with respect to a predetermined reference height position based on the deformed shape when the cam carrier 13 is assembled to the cylinder head body 11. The position has been adjusted. That is, by operating the clamp cylinders 50 and 51 and pressing the cam carrier 13 against the contact surface 44 a of the reference pad 42, the cam is formed in the same shape as when the cam carrier 13 is assembled to the cylinder head body 11. The carrier 13 can be deformed. In the present embodiment, only the contact surface 44a of the center reference pad 42 is set to be several tens of micrometers higher than the contact surfaces 44a of the other eight reference pads 42.

  Subsequently, as shown in FIGS. 6, 7, and 8 (c), when the cam carrier 13 is held in the deformed state by the clamp cylinders 50, 51, the tool driving mechanism 59 is operated to move the cam carrier 13 to the cam carrier 13. The reamer 58 moves forward. Thereby, it is possible to process the cam hole 19 in the cam carrier 13 in a state where the cam carrier 13 is deformed. That is, the cam hole 19 can be processed in the cam carrier 13 so that the roundness and the straightness are increased in the state where the cylinder head body 11 is assembled. Here, FIG. 9A is a schematic diagram showing the cam carrier 13 as a single unit after the cam hole 19 is processed, and FIG. 9B is a schematic diagram showing a state in which the cam carrier 13 is assembled to the cylinder head body 11. FIG. As shown in FIG. 9A, when the cam carrier 13 is removed from the work support base 41 after the cam hole 19 is machined, the restraint state of the cam carrier 13 is released, so that the cam carrier 13 returns to its original shape. As a result, the roundness of the cam hole 19 decreases. However, as shown in FIG. 9B, when the cam carrier 13 is assembled to the cylinder head body 11, the deformation state similar to that at the time of drilling is reproduced. As a result, the roundness of the cam hole 19 is improved. Moreover, since the through-hole portion 32 through which the carrier bolt 12 is guided is constrained by the reference pad 42 and the clamp cylinders 50 and 51, the deformation state of the cam carrier 13 in a state where it is assembled to the cylinder head body 11 can be accurately reproduced. It becomes possible. By processing the cam hole 19 in the cam carrier 13 by such a procedure, the roundness and the like of the cam hole 19 when assembled to the cylinder head body 11 can be increased, and the cam supported by the cam carrier 13 The shaft 16 can be smoothly rotated.

  As described above, the shim 45 is assembled to the reference pad 42. By changing (changing, increasing, or reducing) the shim 45, the contact surface 44a of the reference pad 42 with respect to a predetermined reference height position. It is possible to finely adjust the height position. Thus, since the height dimension of the reference pad 42 can be adjusted, the deformation amount of the cam carrier 13 can be easily adjusted, and the deformation when the cam carrier 13 is assembled to the cylinder head body 11. It becomes possible to accurately reproduce the state. When the height dimension of each reference pad 42 is first determined, the processing and measurement of the cam hole 19 are repeated while adjusting the height dimension of each reference pad 42. That is, after machining the cam hole 19 in the cam carrier 13 on the work support base 41, the cam carrier 13 is attached to the cylinder head body 11 and the shape of the cam hole 19 is measured. When the shape of the cam hole 19 is out of the predetermined allowable range, the height dimension of each reference pad 42 is readjusted. Such adjustment work of each reference pad 42 is repeated until the shape of the cam hole 19 in a state where the cam carrier 13 is assembled to the cylinder head body 11 is included in a predetermined allowable range.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the installation step, the pressing step, and the processing step may be automatically executed as a series of processing operations, or may be executed by an operator operating a start button or the like for each step. In the above description, the reamer 58 is used as the rotary tool. However, the reamer 58 is not limited to this, and other rotary tools may be used. In the above description, all the through holes 32 provided in the cam carrier 13 are pushed in by the clamp cylinders 50 and 51. However, the present invention is not limited to this, and some of the through holes 32 are inserted into the clamp cylinder 50. , 51 may be used.

11 Cylinder head body 12 Carrier bolt (bolt member)
13 Cam carrier 16 Cam shaft 19 Cam hole 32 Through hole (bolt hole)
40 Manufacturing Equipment 41 Work Support Base 42 Reference Pad (Supporting Protrusion)
45 shim (thin plate member)
50 Clamp cylinder (Clamp mechanism)
51 Clamp cylinder (Clamp mechanism)
53 Rotating arm (arm member)
56 Rotating arm (arm member)
58 Reamer (Rotary Tool)
59 Tool drive mechanism

Claims (4)

A cam carrier manufacturing apparatus for forming a cam hole for supporting a camshaft in a cam carrier fixed to a cylinder head body using a bolt member,
A plurality of support protrusions that are provided on a work support on which the cam carrier is installed, and that support bolt holes of the cam carrier through which the bolt members are guided;
An arm member that contacts the bolt hole from the opposite side of the support protrusion, and a plurality of clamp mechanisms that press the bolt hole against the support protrusion;
And a tool driving mechanism for machining the cam hole by moving a rotary tool in an axial direction under a state in which the bolt hole is pressed by the clamp mechanism to deform the cam carrier. Cam carrier manufacturing equipment. The cam carrier manufacturing apparatus according to claim 1,
An apparatus for manufacturing a cam carrier, wherein at least one of the support protrusions is different in height from the other support protrusions. In the cam carrier manufacturing apparatus according to claim 1 or 2,
An apparatus for manufacturing a cam carrier, wherein a thin plate member is provided between the work support base and the support convex portion, and the height of the support convex portion is adjusted by changing the thin plate member. A cam carrier manufacturing method for forming a cam hole for supporting a camshaft in a cam carrier fixed to a cylinder head body using a bolt member,
An installation step in which the cam carrier is installed on a work support base having a plurality of support protrusions, and the bolt hole portions of the cam carrier through which the bolt members are guided are supported by the plurality of support protrusions;
A pressing step of pressing the bolt hole portion of the cam carrier against the support convex portion by a plurality of clamp mechanisms including an arm member that contacts the bolt hole portion from the opposite side of the support convex portion;
And a machining step of machining the cam hole by moving a rotary tool in an axial direction under a state where the bolt hole is pressed by the clamp mechanism and the cam carrier is deformed. Carrier manufacturing method.

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