JP5778207B2 - Press-in method and press-in device - Google Patents

Description

  The present invention relates to a press-fitting method for press-fitting a valve guide and a valve seat into a cylinder head, and also relates to a press-fitting device that performs this press-fitting method.

  The cylinder head of the engine includes valves (intake valves and exhaust valves) that perform intake and exhaust of fuel gas. For this reason, a valve guide capable of guiding the displacement of the valve and a valve seat constituting the valve seat of the valve at a position opposite to the valve guide are mounted in the valve arrangement space of the cylinder head.

  The press-fitting device is used for press-fitting the valve guide and the valve seat into the cylinder head. For example, Patent Document 1 discloses a press-fitting device that press-fits a valve guide and a valve seat into a cylinder head using a single press. This press-fitting device first performs a process of sequentially press-fitting the valve guides into the arrangement space of each intake valve and exhaust valve of the cylinder head, then performs a process of turning the cylinder head upside down, and then press-fitting the valve seats sequentially. The process to do is performed.

JP 2000-141148 A

  By the way, the press-fitting device may be configured to press-fit the valve guide and the valve seat at the same time by the press-fitting operation of one press machine in order to increase the efficiency of the press-fitting operation and reduce the equipment cost. In other words, in the press-fitting operation of the press-fitting part of the press machine, the valve guide is pushed in from the one end side and the valve seat is pushed in from the other end side with the valve guide and valve seat axes aligned with the valve arrangement space. And press-fit both.

  However, in such a configuration in which the valve guide and the valve seat are press-fitted at the same time, the weight of the press machine itself increases. For this reason, the energy required for positioning of the press machine increases, and it is necessary to repeatedly perform calibration of the press-fitting member that actually performs press-fitting in order to ensure press-fitting accuracy. As a result, there has been a situation that it is difficult to achieve sufficient efficiency and reduction in manufacturing cost as a whole of the press-fitting work.

  The present invention has been made in view of the above circumstances, and a press-fitting method and a press-fitting that can efficiently and accurately position a press-fitting portion and a cylinder head when press-fitting a valve guide and a valve seat at the same time. An object is to provide an apparatus.

In order to achieve the above object, the present invention provides a valve guide and a valve in a cylinder head having a first space portion in which one of an intake valve and an exhaust valve is disposed and a second space portion in which the other is disposed. A press-fitting method for press-fitting a sheet, wherein a press-fitting portion is provided in a first transport step of transporting the cylinder head to a first press-fit position, and in the first space portion of the cylinder head transported to the first press-fit position. A first press-fitting step of press-fitting the valve guide and the valve seat simultaneously; a second transport step of transporting the cylinder head to a second press-fitting position provided at a location different from the first press-fitting position; and the first press-fitting A press-fitting part moving step of slidingly moving the press-fitting part along a rail linearly extending between a position and the second press-fitting position; and the cylinder head conveyed to the second press-fitting position Serial in the second space portion, and having a second press-fitting step of the press-fitting portion from the first press fitting position moved to the second press-fitting position is pressed into the valve guide and the valve seat at the same time.

  According to the above, in the press-fitting method of the valve guide and the valve seat, the press-fitting part slides along the rail between the first press-fitting position and the second press-fitting position, thereby positioning the relative position between the cylinder head and the press-fitting part. It can be performed efficiently and accurately. That is, the press-fitting part performs a press-fitting operation on the intake valve arrangement space (first space part) at the first press-fitting position, and then slides along the rail and is arranged at the second press-fitting position. A press-fitting operation can be performed in the (second space). Thereby, the energy concerning a press-fit part is reduced significantly, and positioning of a press-fit part is simplified. As a result, the positioning accuracy between the press-fitting portion and the cylinder head can be improved, and the time required for positioning can be shortened.

  Moreover, since the press-fitting portion press-fits the valve guide and the valve seat into both the intake valve arrangement space and the exhaust valve arrangement space, the operating rate of the entire apparatus is improved. Furthermore, the press-fitting accuracy of the press-fitting part with respect to the intake valve arrangement space and the exhaust valve arrangement space is unified only by performing calibration of the press-fitting part with respect to the cylinder head once. Therefore, the quality after press-fitting can be stabilized, and the time and cost for calibration can be reduced.

  In this case, in the press-fitting method, the first cylinder head is moved through the first jig in which the valve guide and the valve seat to be press-fitted into the first space portion are set before the first transport step. Before the first fixing step for fixing to the transfer device and the second transfer step, the cylinder is inserted through the second jig in which the valve guide and the valve seat are press-fitted into the second space. It is preferable to have a second fixing step of fixing the head to the second transport device.

  As described above, in the first fixing step, the cylinder head is fixed to the first conveying device via the first jig, so that the valve guide and the valve seat can be easily opposed to the first space portion, and the press fitting is performed. The press-fitting by the part can be smoothly promoted. The same effect can be obtained in the second fixing step.

  Further, in the press-fitting method, after the first fixing step, the first transport device tilts the cylinder head so that the shaft centers of the valve guide and the valve seat coincide with the advance direction of the press-fitting member of the press-fitting portion. After the first tilting step and the second fixing step, the second transport device tilts the cylinder head so that the shaft centers of the valve guide and the valve seat coincide with the advance direction of the press-fitting member. It is preferable to have two tilting steps.

  Thus, by performing the first tilting process (or the second tilting process) after the first fixing process (or after the second fixing process), the cylinder head in which the intake valve arrangement space and the exhaust valve arrangement space are non-parallel. However, there is no need to tilt the press-fitting part. Therefore, the structure of the press machine having the press-fit portion can be further simplified, and the failure frequency and cost of the press machine can be reduced.

  Still further, in the press-fitting method, during the execution of the first press-fitting step, the first setting step of setting the valve guide and the valve seat to be press-fitted into the second space portion in the second jig, and the second It is preferable to include a second setting step of setting the valve guide and the valve seat that are press-fitted into the first space portion into the first jig during the press-fitting step.

  In this way, if the valve guide and the valve seat are set when the press-fitting portion or the like is operating, it is possible to effectively use the work time of the worker, so that the productivity of the cylinder head is improved. Can do.

In order to achieve the above object, the present invention provides a valve guide in a cylinder head having a first space portion in which one of an intake valve and an exhaust valve is disposed and a second space portion in which the other is disposed. And a press-fitting device for press-fitting the valve seat, the first transport device transporting the cylinder head to the first press-fitting position, and the cylinder head at a second press-fitting position provided at a location different from the first press-fitting position. a second transfer device for transferring, arranged in the first press fitting position, said first space portion of said cylinder head which is conveyed in the first press fitting position, pressed the valve guide and the valve seat at the same time, and the second space portion of the first said cylinder head which is conveyed through a compression position in the second press-fitted position by moving the second press-fitting position, the valve guide and the valve seat A press-fit portion press-fitted simultaneously, characterized in that between the second press-fitting position and the first press fitting position and a rail to linearly slidable the press-fit portion.

  In this case, the first transport device can fix the cylinder head via the first jig in which the valve guide and the valve seat press-fitted into the first space portion are set, and the second transport The apparatus may be capable of fixing the cylinder head via a second jig in which the valve guide and the valve seat that are press-fitted into the second space are set.

  Further, each of the first and second conveying devices has an angle adjusting mechanism for inclining the cylinder head so that the shaft centers of the valve guide and the valve seat coincide with the advancing direction of the press-fitting member of the press-fitting portion. Is preferred.

  According to the press-fitting method and the press-fitting device of the present invention, when the valve guide and the valve seat are press-fitted at the same time, the press-fitting part for performing press-fitting and the cylinder head can be positioned efficiently and accurately.

It is a top view which shows roughly the press injection apparatus which concerns on one Embodiment of this invention. 2A is a plan view showing a cylinder head conveyed in the press-fitting device of FIG. 1, and FIG. 2B is a sectional view taken along line IIB-IIB of FIG. 2A. It is sectional drawing which shows the structure of the cylinder head fixed in the 1st standby position of the press injection apparatus of FIG. 1, and its peripheral part. 4A is a cross-sectional view illustrating a state when the cylinder head is transported to the first standby position, and FIG. 4B is a cross-sectional view illustrating a state when the cylinder head is transported to the first press-fitting position. FIG. 2 is a partial side cross-sectional view schematically showing a first transfer device in FIG. 1. 6A is a partial side cross-sectional view showing a tilted state of the cylinder head by the first transfer device of FIG. 5, and FIG. 6B is a partial side cross-sectional view showing a state in which the cylinder head of FIG. 6A is transferred to the first press-fitting position. It is. 7A is a front view schematically showing the press of FIG. 1, and FIG. 7B is a side view schematically showing the press of FIG. FIG. 8A is a first explanatory diagram for explaining the press-fitting operation by the press machine, and FIG. 8B is a second explanatory diagram for explaining the press-fitting operation by the press machine. FIG. 9A is a third explanatory diagram for explaining the press-fitting operation by the press machine, and FIG. 9B is a fourth explanatory diagram for explaining the press-fitting operation by the press machine. FIG. 10A is a schematic plan view showing an arrangement relationship of a pair of press-fitting portions with respect to the cylinder head, FIG. 10B is a first explanatory diagram showing a press-fitting procedure into six intake valve arrangement spaces, and FIG. 10D is a second explanatory diagram of a press-fitting procedure following 10B, FIG. 10D is a third explanatory diagram of a press-fitting procedure following FIG. 10C, and FIG. 10E is a fourth explanatory diagram of a press-fitting procedure following FIG. 10D. 10F is a fifth explanatory diagram of the press-fitting procedure following FIG. 10E.

  Hereinafter, a preferred embodiment of a press-fitting device according to the present invention will be described in detail in relation to a press-fitting method, and will be described in detail with reference to the accompanying drawings.

  As described above, the press-fitting device according to the present invention is a device for press-fitting a valve guide and a valve seat into a cylinder head, and constitutes a part of a production line for producing a cylinder head of an engine. Schematically, the press-fitting device includes one press machine that press-fits the valve guide and the valve seat into the entire valve space of the cylinder head in order to reduce the equipment cost. Furthermore, this press-fitting device has a configuration in which the valve guide and the valve seat can be press-fitted simultaneously by one press-fitting operation of the press machine in order to improve work efficiency.

  In the following description, the direction of the press-fitting device or the cylinder head will be described with reference to the directions of arrows XYZ in FIG. 1 unless otherwise specified. That is, the left and right directions in FIG. 1 are the X direction (the right direction is the X1 direction, the left direction is the X2 direction), the up and down direction is the Y direction (the upper direction is the Y1 direction, the lower direction is the Y2 direction), and the vertical direction on the page is the Z direction. (The front side of the page is called the Z1 direction, and the back side of the page is called the Z2 direction). The Z direction is also the vertical direction of the press-fitting device and the cylinder head.

  The press-fitting device 10 according to an embodiment of the present invention includes a main conveyance line 14 that linearly conveys the cylinder head 12 in the X1 direction in a plan view (see FIG. 1). As for the main conveyance line 14, the upstream conveyor 16, the 1st conveying apparatus 18, the intermediate conveyor 20, the 2nd conveying apparatus 22, and the downstream conveyor 24 are arrange | positioned in order toward the downstream (X1) side from the upstream (X2) side. Consists of.

  The upstream conveyor 16, the intermediate conveyor 20, and the downstream conveyor 24 are devices for transporting the cylinder head 12 in the X1 direction. Each conveyor 16, 20, 24 has a plurality of rollers 26 and a roller motor (not shown). By rotating the plurality of rollers 26 under the control of the control device 28, the cylinder head 12 is moved in the X1 direction. Transport. The configurations of the conveyors 16, 20, and 24 are not particularly limited. For example, an operator may push the cylinder head 12 supplied onto the roller 26 without providing a roller motor. .

  Between the upstream conveyor 16 and the intermediate conveyor 20, a first standby position A1 for temporarily stopping the transport of the cylinder head 12 is provided, and the first transport device 18 is disposed at the first standby position A1. Similarly, a second standby position B1 for temporarily stopping the transport of the cylinder head 12 is provided between the intermediate conveyor 20 and the downstream conveyor 24, and the second transport device 22 is provided at the second standby position B1. .

  The first and second transfer devices 18 and 22 are configured to be movable in a direction orthogonal to the main transfer line 14 (Y direction). The first transport device 18 moves in a range from the first standby position A1 to the first press-fitting position A2 that is separated from the first standby position A1, and the second transport device 22 is moved to the second press-fit position that is separated from the second standby position B1 by a predetermined interval. Move the range up to B2.

  A gantry 30 that is long in the X direction is installed at a position opposite to the main conveyance line 14 of the first and second press-fitting positions A2 and B2. A rail 32 that extends linearly along the longitudinal direction is laid on the gantry 30. A single press machine 36 having a press-fit portion 34 for press-fitting the valve guide G and the valve seat S into the cylinder head 12 is disposed on the rail 32. That is, the press-fit portion 34 is movable along the rail 32 between the first press-fit position A2 and the second press-fit position B2, and the valve guide G and the first press-fit position A2 and the second press-fit position B2, respectively. The valve seat S is press-fitted.

  The control device 28 is provided in the vicinity of the main transfer line 14 and is configured to control the operation of the entire press-fitting device 10. For example, the control device 28 switches operation execution or operation interruption based on the content set by the worker.

  Here, in order to facilitate understanding of the present invention, the configuration of the cylinder head 12 will be described together with the valve guide G and the valve seat S that are press-fitted with reference to FIGS. 2A and 2B.

  The cylinder head 12 according to the present embodiment constitutes the upper side of an in-line three-cylinder engine and includes a combustion space 38 facing the three cylinders of a cylinder block (not shown) on the lower surface side. The cylinder head 12 includes an intake valve (not shown) that allows and shuts off the inflow of fuel gas to the combustion space 38, and an exhaust valve (not shown) that allows and shuts off the exhaust of gas after combustion from the combustion space 38. ) Is installed. Therefore, inside the cylinder head 12, there are an intake valve arrangement space 40 (first space portion) for arranging the intake valves, and an exhaust valve arrangement space 42 (second space portion) for arranging the exhaust valves. Is formed.

  The cylinder head 12 employs a so-called multi-valve in which four valves (two intake valves and two exhaust valves) are arranged for one cylinder. Therefore, the cylinder head 12 has six intake valve arrangement spaces 40 on the Y1 direction side and six exhaust valve arrangement spaces 42 on the Y2 direction side in plan view (see FIG. 2A).

  The valve arrangement space 44 (the intake valve arrangement space 40 and the exhaust valve arrangement space 42) is divided into upper guide accommodation portions 40a and 42a and lower seat accommodation portions 40b and 42b by a fuel gas flow passage 46. The The mutual axes of the guide accommodating portions 40a and 42a and the sheet accommodating portions 40b and 42b are formed coaxially with the flow passage 46 interposed therebetween.

  The guide accommodating portions 40a and 42a are spaces formed in elongated holes, and the valve guide G is press-fitted therein. The valve guide G is formed in a cylindrical shape and has an outer diameter that matches the inner diameter of the guide housing portions 40a and 42a. The valve guide G is tightly fitted to the guide housing portions 40 a and 42 a by press-fitting the press-fitting device 10.

  On the other hand, the seat accommodating portions 40b and 42b are spaces formed in holes having a diameter larger than that of the guide accommodating portions 40a and 42a and shorter in the axial direction, and the valve seat S is press-fitted therein. The valve seat S is formed in a ring shape and has an outer diameter that matches the inner diameter of the seat accommodating portions 40b and 42b. The valve seat S is tightly fitted to the seat accommodating portions 40b and 42b by the press-fitting of the press-fitting device 10.

  The axis O1 of the intake valve arrangement space 40 and the axis O2 of the exhaust valve arrangement space 42 are set to face different directions (non-parallel) in a side sectional view. Specifically, the axis O1 of the intake valve arrangement space 40 is inclined by α degrees with respect to the imaginary line L extending in the Z direction from the substantially central portion in the Y direction (combustion space 38) of the cylinder head 12, and the axis of the exhaust valve arrangement space 42 O2 is tilted by -α degrees.

  For this reason, as shown in FIGS. 1 and 3, the press-fitting device 10 is provided with a jig (first jig 48, second jig) for the cylinder head 12 before the valve guide G and the valve seat S are press-fitted. 50) is set. The first jig 48 is provided on the mounting portion 18 a of the first transport device 18 and arranges the valve guide G and the valve seat S along the axis O <b> 1 of the intake valve arrangement space 40 of the cylinder head 12. is there. The second jig 50 is provided on the mounting portion 22a of the second transport device 22, and is configured to arrange the valve guide G and the valve seat S along the axis O2 of the exhaust valve arrangement space 42 of the cylinder head 12, respectively. is there.

  That is, in the cylinder head 12 in which the intake valve arrangement space 40 and the exhaust valve arrangement space 42 are formed in different directions, it is difficult to set the valve guide G and the valve seat S on one dedicated jig at the same time. This is because the press-fitting portion of the valve seat S with respect to the intake valve arrangement space 40 and the press-fitting portion of the valve seat S with respect to the exhaust valve arrangement space 42 interfere with each other. Further, it is easy for an operator to make a mistake in setting the valve guide G and the valve seat S that are press-fitted into the intake valve arrangement space 40 and the exhaust valve arrangement space 42.

  Therefore, the press-fitting device 10 according to the present embodiment first sets the first jig 48 at the first standby position A1 in order to press-fit the valve guide G and the valve seat S into the intake valve arrangement space 40. Then, in order to press-fit the valve guide G and the valve seat S into the exhaust valve arrangement space 42, the second jig 50 is set at the second standby position B1 by changing the location from the first standby position A1. ing.

  Here, returning to FIG. 1, the flow of the cylinder head 12 when the valve guide G and the valve seat S are press-fitted by the press-fitting device 10 will be briefly described. When the cylinder head 12 is supplied to the upstream conveyor 16, the cylinder head 12 is guided in the X1 direction along the upstream conveyor 16, and temporarily stops at the first standby position A <b> 1 where the placement portion 18 a of the first transport device 18 is disposed. . Thereafter, the cylinder head 12 is fixedly held by the first jig 48 based on the operation of the first transporting device 18, so that the valve guide G and the valve seat S are arranged at positions facing the intake valve arrangement space 40.

  Next, the cylinder head 12 is transported from the first standby position A1 to the first press-fitting position A2 by the first transport device 18. Then, the valve guide G and the valve seat S are press-fitted into the intake valve arrangement space 40 by the press machine 36 at the first press-fitting position A2. After the press-fitting, the cylinder head 12 is returned to the first standby position A1 by the first transport device 18, and the first jig 48 is released.

  Further, the cylinder head 12 is sent out via the intermediate conveyor 20 to the second standby position B1 where the placement portion 22a of the second transport device 22 is disposed. The worker moves in advance from the first standby position A1 to the second standby position B1, and sets the valve guide G and the valve seat S with respect to the second jig 50 at the second standby position B1. The cylinder head 12 sent to the second standby position B1 is fixedly held by the second jig 50 under the operation of the second transport device 22, so that the valve guide G and the valve seat S are in the exhaust valve arrangement space 42. Are arranged at the opposite positions.

  Thereafter, similarly to the above, the second conveying device 22 conveys the valve guide G and the valve seat S to the exhaust valve from the second standby position B1 to the second press-fitting position B2 by the press machine 36 at the second press-fitting position B2. It is press-fitted into the arrangement space 42. The press machine 36 is slid in advance from the first press-fit position A2 to the second press-fit position B2. The operation of the press machine 36 will be described later.

  After the press-fitting, the cylinder head 12 is returned to the second standby position B1 by the second transport device 22, and the fixation of the second jig 50 is released. Then, the cylinder head 12 is sent from the second standby position B1 to the downstream conveyor 24, and is conveyed in the X1 direction by the downstream conveyor 24, and proceeds to the next process.

  Next, a specific configuration of the first and second transfer devices 18 and 22 of the press-fitting device 10 will be described. In addition, since the structure of the 2nd conveying apparatus 22 containing the 2nd jig | tool 50 can take the 1st conveying apparatus 18 and a Y-direction symmetrical structure fundamentally, it abbreviate | omits about the detailed description.

  As shown in FIGS. 3, 4A, and 4B, the mounting portion 18a of the first transport device 18 is configured to fix and hold the cylinder head 12 transported to the first standby position A1. For this reason, the placing portion 18 a includes a guide jig 52, a conveyance rail 54, a hydraulic device 56, a guide member 58, a sheet jig 60, and a tilting table 62.

  The guide jig 52 constitutes one of the first jigs 48 and has a function of arranging the valve guide G at a position facing the intake valve arrangement space 40. The guide jig 52 includes a guide holding mechanism 64, a holding block 66, a jig displacement mechanism 68, and a movable table 70.

  The guide holding mechanism 64 is a member that holds the valve guide G before press-fitting. The guide holding mechanism 64 has a cylindrical shape having a predetermined length in the axial direction, and six guide holding mechanisms 64 are arranged in parallel in the X direction of the holding block 66 in accordance with the number and positions of the intake valve arrangement spaces 40 of the cylinder head 12. Is done. The guide holding mechanism 64 is inclined and fixed to the holding block 66 so as to coincide with the inclination angle α of the intake valve arrangement space 40. When the holding block 66 is displaced toward the cylinder head 12 by the jig displacing mechanism 68, the axis of the guide holding mechanism 64 acts so as to exactly overlap the axis O1 of the intake valve arrangement space 40.

  A guide hole 64 a is formed through the shaft center portion of the guide holding mechanism 64. The guide hole 64a temporarily holds the valve guide G and sends the valve guide G from the lower end opening by applying a predetermined pressing force. A retaining portion 64b that elastically narrows the inner diameter of the guide hole 64a is provided on the inner surface near the top of the guide hole 64a. Therefore, when the valve guide G is inserted from the upper end opening of the guide hole 64a, the valve guide G is temporarily fastened by the retaining portion 64b. In addition, a guide space 64c having a smaller diameter than the upper side (an inner diameter substantially matching the outer diameter of the valve guide G) is formed on the inner surface from the lower halfway position to the lower end portion of the guide hole 64a. For this reason, when the valve guide G is sent out from the lower end opening of the guide hole 64a, a strong pressing force is required to be applied to the press-fit portion 34. However, the posture of the valve guide G is surely corrected by the guide space 64c. Can be sent out.

  The holding block 66 has an attachment surface 66a that holds the guide holding mechanism 64 at an angle. The holding block 66 has a hole through which the support 68 a of the jig displacement mechanism 68 is inserted, and can be displaced in the Z direction relative to the movable base 70 by the jig displacement mechanism 68.

  The jig displacement mechanism 68 is fixed above the support 68 a protruding from the movable base 70, the spring 68 b urging the holding block 66 upward, the cam roller 68 c provided on the mounting surface 66 a, and the first transport device 18. The cam rail 68d. The cam roller 68c is disposed at a position facing the cam rail 68d and is rotatably supported on the upper portion of the holding block 66. As shown in FIG. 5, the cam rail 68d has an inclined surface that extends along the conveyance path of the first conveyance device 18 and is inclined obliquely downward toward the first press-fitting position A2.

  That is, the guide holding mechanism 64 and the holding block 66 are waiting at the first standby position A1 at the upper position separated from the movable base 70 by the spring 68b as shown in FIG. Then, based on the movement in the Y1 direction by the first conveying device 18, the cam roller 68c rolls along the inclined surface of the cam rail 68d, thereby being displaced downward (see also FIG. 6B). As a result, the lower end opening of the guide holding mechanism 64 is arranged at a position facing the intake valve arrangement space 40.

  Returning to FIG. 3, the movable base 70 is formed in a flat plate shape having a sufficiently larger area than the cylinder head 12, and both sides of the Y direction are supported by the hydraulic device 56 so that the entire guide jig 52 moves up and down. Can be displaced. The movable base 70 waits at the upper position until the cylinder head 12 is conveyed to the first standby position A1, and after the cylinder head 12 is disposed at the first standby position A1, it is displaced downward to displace the cylinder head 12. Hold from above. A positioning pin 70a to be inserted into the positioning hole 12a of the cylinder head 12 is provided on the lower surface of the movable base 70, so that the cylinder head 12 can be fixed and held with high accuracy.

  The transport rail 54 of the mounting portion 18a is connected to the hydraulic device 56 together with the movable base 70, and can be displaced up and down. That is, the conveyance rail 54 is disposed at the upper position when the cylinder head 12 is conveyed in the X1 direction, thereby separating the cylinder head 12 from the sheet jig 60. When the cylinder head 12 is arranged at the first standby position A1, the cylinder head 12 is placed on the sheet jig 60 by being displaced downward.

  The hydraulic device 56 has a movable column 56 a that moves up and down by a cylinder connected to a hydraulic pressure supply unit (not shown), and displaces the movable table 70 and the conveyance rail 54 up and down under the control of the control device 28.

  The guide member 58 suppresses the posture fluctuation of the cylinder head 12 in the yaw direction during conveyance on the main conveyance line 14, and is provided on both sides of the main conveyance line 14 in the Y direction. The guide member 58 is separated from the upstream conveyor 16 and the intermediate conveyor 20 at the first standby position A1 and is provided on the tilting table 62 so that it can move in the Y direction together with the first transport device 18. In particular, the guide member 58 prevents the cylinder head 12 from being displaced by supporting the side surface of the cylinder head 12 when the cylinder head 12 is tilted.

  Before the cylinder head 12 is transported to the first standby position A1, the seat jig 60 is set at the first standby position A1 with the valve seat S set by an operator. Then, when the conveyance rail 54 is lowered after the cylinder head 12 is conveyed, the cylinder head 12 is placed on the upper portion thereof. The sheet jig 60 includes a sheet holding mechanism 72 that holds the valve seat S before press-fitting, a pedestal 74 to which the sheet holding mechanism 72 is fixed, and a guide bar 76 that protrudes from both sides of the pedestal 74 in the Y direction. .

  The seat holding mechanisms 72 are supported by being inclined to the pedestal 74 so as to coincide with the inclination angle α of the intake valve arrangement space 40, and six seat holding mechanisms 72 are arranged in the X direction in the same manner as the guide holding mechanism 64. The seat holding mechanism 72 is fixed and movable to a holding body 72a that holds the valve seat S, a movable rod 72b to which the holding body 72a is screwed, a spring 72c that biases the movable rod 72b downward, and a pedestal 74. A guide cylinder 72d for guiding the rod 72b.

  The holding body 72a is formed in a convex shape having an outer diameter smaller than the inner diameter of the seat accommodating portion 40b, and the valve seat S is mounted so as to surround the side peripheral surface. The upper end of the movable rod 72b is screwed to the center of the holding body 72a and penetrates from the upper surface to the lower surface of the pedestal 74. A bulging portion 72e bulging radially outward is formed at the lower end of the movable rod 72b, and the bulging portion 72e can receive the biasing force of the spring 72c. Thereby, the holding body 72a waits on the pedestal 74 side via the movable rod 72b in a normal state. And the holding body 72a and the movable rod 72b advance and move upward by being pushed out by a press-fit block 130 of the press machine 36 described later.

  The pedestal 74 has a mounting surface 74a having a size that allows the cylinder head 12 to be mounted, and the mounting surface 74a is formed with a notch 74b that waits for the holding body 72a. The notch 74b is provided with an attachment hole for attaching the sheet holding mechanism 72 at an angle.

  The guide jig 52 and the sheet jig 60 of the first jig 48 are basically configured as described above. On the other hand, the second jig 50 presses the valve guide G and the valve seat S into the exhaust valve arrangement space 42 so that the guide holding mechanism 64 and the seat holding mechanism 72 are connected to the virtual line L (see FIG. 2). As a symmetry axis, the arrangement relationship is opposite to that of the first jig 48.

  On the other hand, the tilting table 62 is a table that integrally supports each component (excluding the cam rail 68d) of the mounting portion 18a provided on the upper side of the tilting table 62. The tilting table 62 is configured such that the angle of inclination of the upper surface can be adjusted by the angle adjusting mechanism 82 of the first conveying device 18, whereby the cylinder head 12 fixedly held by the sheet jig 60 is tilted by a predetermined angle. And

  Therefore, the configuration below the tilting table 62 of the first transport device 18 will be specifically described with reference to FIGS. 5, 6A, and 6B. As described above, the first transfer device 18 is configured to adjust the inclination of the tilting table 62 and to reciprocate between the first standby position A1 and the first press-fit position A2. In order to realize this, the lower side of the tilting table 62 of the first transport device 18 includes a fixed table 78, a linear drive mechanism 80, an angle adjusting mechanism 82, and a frame body 84.

  The fixed base 78 is formed in a shape that is long in the Y direction between the upstream conveyor 16 and the intermediate conveyor 20 (that is, between the first standby position A1 and the first press-fit position A2).

  The linear drive mechanism 80 includes a conveyance motor 86 fixed on a fixed base 78, a screw shaft 88 that is rotated by the conveyance motor 86, and a bracket 90 that is displaced in a linear direction based on the rotation of the screw shaft 88. . The conveyance motor 86 is on the Y2 side of the first conveyance device 18, and the screw shaft 88 extends from the conveyance motor 86 in the Y1 direction to reach the first press-fitting position A2. A screw groove is formed on the outer peripheral surface of the screw shaft 88. The bracket 90 has a hole portion 90a through which the screw shaft 88 is inserted, and a ball (not shown) that rolls on the screw groove is provided in the hole portion 90a. The bracket 90 converts the rotational force into the direct drive by the ball rolling while maintaining its posture with respect to the rotation of the screw shaft 88. Accordingly, the linear drive mechanism 80 integrally slides the member provided on the bracket 90 along the screw shaft 88.

  The angle adjusting mechanism 82 is attached to the bracket 90 and includes a tilting cylinder 92, a link portion 94, a rotating portion 96, and a tilt restricting portion 98. The tilting cylinder 92 has a support cylinder 92a whose one end is swingably attached to the bracket 90, and a movable cylinder 92b that is displaceable in the axial direction of the support cylinder 92a. The link part 94 is connected. The link unit 94 converts the displacement force of the movable cylinder 92 b into the rotation force of the rotation unit 96 and transmits it to the rotation unit 96. The rotating portion 96 is pivotally supported by the frame body 84 and holds the tilting table 62 fixedly.

  Therefore, when the rotating unit 96 rotates, the tilting table 62 tilts so that the Y1 side is displaced upward with the rotation center of the rotating unit 96 as a base point. The tilt restricting portion 98 includes a contact portion 98 a that is provided on the lower side in the Y2 direction of the tilt base 62 and receives the tilt base 62 tilted by the rotation of the rotating portion 96. The distance between the abutment portion 98a and the tilt table 62 can be adjusted, and the tilt angle of the tilt table 62 can be set as appropriate.

  The frame body 84 is attached to both sides in the X direction of the bracket 90 and extends upward, and supports the tilting table 62 and the rotating unit 96 while forming a cavity 84a in the X direction middle part and the upper and lower middle parts. The cavity 84a is for allowing the lower arm 118 of the press machine 36 to enter and be disposed below the cylinder head 12 when the bracket 90 moves to the first press-fitting position A2.

  The angle adjustment mechanism 82 of the second transfer device 22 is configured to be inclined opposite to the angle adjustment mechanism 82 of the first transfer device 18 so that the axis O2 of the exhaust valve arrangement space 42 of the cylinder head 12 is vertical. It has become. That is, the tilting cylinder 92 and the link portion 94 are attached to be inclined to the Y2 side, and the tilting table 62 is tilted so that the Y2 side is displaced upward.

  Next, the press machine 36 will be described with reference to FIGS. 7A and 7B. As described above, the press machine 36 is a device that simultaneously press-fits the valve guide G and the valve seat S into the cylinder head 12, and includes the main body 100, the press machine moving mechanism 102, the pair of press-fit parts 34, and the press-fit part movement. A mechanism 104 is provided.

  The main body 100 is mounted on the gantry 30 and has a frame structure that can support the pair of press-fit portions 34 at a predetermined height. The pair of press-fit portions 34 are provided near the upper portion of the main body portion 100 and on the Y2 side. In order to stably support the press-fit portion 34, a wide base 106 that substantially matches the width of the gantry 30 in the Y direction is provided at the lower portion of the main body portion 100. The base 106 is provided with a press machine moving mechanism 102 that allows the entire press machine 36 to move along the rail 32 of the gantry 30.

  The rails 32 on the gantry 30 are constituted by three rails (a pair of guide rails 32a on both sides in the Y direction and a drive support rail 32b in the center in the Y direction). The press machine moving mechanism 102 moves the press machine 36 along the rails 32 and positions the press-fit portion 34 at each of the first press-fit position A2 and the second press-fit position B2. For this reason, the press moving mechanism 102 includes a pair of guide recesses 108, wheels 110, and a servo motor 112.

  The pair of guide recesses 108 are provided on both sides of the base 106 in the Y direction so as to face the pair of guide rails 32a. The press machine 36 is guided linearly in the X direction by the guide rail 32a entering the guide recess 108.

  The wheel 110 is brought into contact with the upper surface of the transport rail 54 with a large frictional force, and is rotated by the servo motor 112 to roll on the transport rail 54. The servo motor 112 is connected to the control device 28 and rotates the wheel 110 under the control of the control device 28. A sensor (not shown) is provided at a predetermined position of the gantry 30, and the control device 28 controls the rotation amount and the rotation speed of the servo motor 112 based on the sensor signal. Accordingly, the press-fitting device 10 can accurately position the pair of press-fitting parts 34 supported by the main body part 100 at the first and second press-fitting positions A2 and B2.

  The pair of press-fit portions 34 are formed in a substantially C shape in which the upper arm 114, the intermediate support portion 116, and the lower arm 118 are connected in order from the upper side in a side view. The pair of press-fit portions 34 are connected by a connecting bar 119 so that the distance between them is constant. A guide press-fit portion 120 for press-fitting the valve guide G is provided near the end of the upper arm 114 in the Y2 direction, and a seat press-fit portion 122 for press-fitting the valve seat S is provided near the end of the lower arm 118 in the Y2 direction. It has been.

  The guide press-fit portion 120 includes a guide press-fit drive source 124 connected to the control device 28 and a press-fit rod 126 (press-fit member) that moves up and down by the guide press-fit drive source 124. The guide press-fitting drive source 124 is constituted by, for example, a servo motor. The press-fit rod 126 is formed in a column shape having the same outer diameter as the valve guide G, and advances and retreats based on the drive of the guide press-fit drive source 124. When the press-fitting rod 126 advances, the tip surface comes into contact with the end of the valve guide G, and the valve guide G is press-fitted by further advancement.

  On the other hand, the seat press-fitting unit 122 includes a seat press-fitting drive source 128 connected to the control device 28 and a press-fitting block 130 (press-fitting member) that moves forward and backward by the seat press-fitting drive source 128. The sheet press-fitting drive source 128 is also constituted by a servo motor, for example. The press-fitting block 130 moves up and down based on driving of the seat press-fitting drive source 128 at a position facing the press-fitting rod 126. The upper surface of the press-fitting block 130 is formed on a relatively large extruded surface, so that it is possible to reliably receive the downward pressure applied during the press-fitting operation of the press-fitting device 10.

  The intermediate support part 116 in which the upper arm 114 and the lower arm 118 are connected is attached to the main body part 100 via the press-fit part moving mechanism 104. That is, the pair of press-fit portions 34 are displaced in the X direction relative to the main body portion 100 by the press-fit portion moving mechanism 104 in order to press-fit the six intake valve placement spaces 40 and the six exhaust valve placement spaces 42.

  The press-fit part moving mechanism 104 includes a press-fit part drive source 132 attached to the main body part 100, a drive transmission part 134 that transmits the driving force of the press-fit part drive source 132 to the intermediate support part 116, and a pair of press-fit parts 34. And a guide rod 136 that guides the displacement. For example, the press-fitting unit moving mechanism 104 is configured by a servo motor, and the drive transmission unit 134 is configured by a screw shaft of the servo motor and a slider that is fixed to the intermediate support unit 116 and linearly moves along the screw shaft. The press-fit portion moving mechanism 104 moves the pair of press-fit portions 34 at the first press-fit position A <b> 2 so that the press-fit rod 126 and the press-fit block 130 face the predetermined intake valve arrangement space 40. Similarly, the pair of press-fit portions 34 are moved at the second press-fit position B2, and the press-fit rod 126 and the press-fit block 130 are made to face the predetermined exhaust valve arrangement space 42.

  Next, the operation when the valve guide G and the valve seat S are simultaneously press-fitted from the press-fitting portion 34 will be specifically described with reference to FIGS. 8A to 9B. In the cylinder head 12, the valve guide G is set on the guide jig 52 and the valve seat S is set on the sheet jig 60 by the operator before the press-fitting operation. The valve guide G is held and held by the retaining portion 64b of the guide holding mechanism 64 along the axis O1 of the intake valve arrangement space 40, and the valve seat S is held along the axis O1 of the intake valve arrangement space 40. It is held by the body 72a.

  Then, as shown in FIG. 8A, the press-fitting device 10 fixes and holds the cylinder head 12 by the above-described first transfer device 18 before the press-fitting operation, so that the axis O1 of the intake valve arrangement space 40 is set. Match with Z direction (vertical direction). For this reason, in the first press-fitting position A2 where the cylinder head 12 and the press-fitting portion 34 are positioned, the axis O1 of the intake valve arrangement space 40 coincides with the axis of the press-fitting rod 126 and the press-fitting block 130 (in the advance direction). . In other words, the first jig 48 maintains the posture so that the axes of the cylinder head 12 and the press-fit portion 34 are aligned in the Z direction.

  Thereafter, as shown in FIG. 8B, the press-fitting device 10 advances the press-fitting rod 126 downward to push out the valve guide G. Thereby, the valve guide G is pushed out from the retaining portion 64b and displaced downward, and falls to the upper end portion of the guide space 64c. Since the guide space 64c matches the outer diameter of the valve guide G, the guide space 64c holds the valve guide G with an appropriate frictional force.

  Next, as shown in FIG. 9A, the press-fitting device 10 advances the press-fitting block 130 upward to push out the movable rod 72b. As a result, the holding body 72a provided at the upper end of the movable rod 72b moves forward into the sheet storage portions 40b and 42b, and the valve seat S held by the holding body 72a is press-fitted into the sheet storage portions 40b and 42b. The At this time, the press-fit rod 126 has entered the guide hole 64a of the guide holding mechanism 64, and can be supported so that the intake valve arrangement space 40 is not shaken.

  Then, after the press-fitting of the valve seat S, as shown in FIG. 9B, the valve guide G is press-fitted into the guide accommodating portions 40a and 42a by further advancing the press-fitting rod 126 downward. Since the posture of the valve guide G is guided by the guide space 64c, the valve guide G is accurately press-fitted into the guide accommodating portions 40a and 42a. Further, the pressure applied downward when the valve guide G is press-fitted can be satisfactorily received by the valve seat S and the holding body 72a entering the seat accommodating portions 40b and 42b.

  Thereby, the press-fitting of the valve guide G and the valve seat S into one intake valve arrangement space 40 is completed. Thereafter, the press-fitting rod 126 and the press-fitting block 130 are moved backward from the cylinder head 12, and the press-fitting part moving mechanism 104 is driven to move the press-fitting part 34 in the X direction in order to perform a press-fitting operation to the next intake valve arrangement space 40. . The press-fitting device 10 repeats the above operation until the valve guide G and the valve seat S are press-fitted into all six intake valve arrangement spaces 40 of the cylinder head 12.

  The press machine 36 has a configuration in which a pair of press-fitting portions 34 are provided in order to quickly perform the press-fitting operation. The distance between the pair of press-fit portions 34 (the first press-fit portion 34a and the second press-fit portion 34b) is adjusted according to the locations where the intake valve placement space 40 and the exhaust valve placement space 42 of the cylinder head 12 are formed. Hereinafter, the press-fitting procedures will be described with reference numerals A to F in order from the X2 side to the X1 side of the six intake valve arrangement spaces 40 of the cylinder head 12 according to the present embodiment. As shown in FIG. 10A, the press-fit portion 34 is disposed such that the first press-fit portion 34a faces the intake valve placement space 40A and the second press-fit portion 34b faces the intake valve placement space 40E. It is configured.

  In the press-fitting work of the press machine 36, first, the second press-fitting part 34b is pressed against the intake valve arrangement space 40C (see FIG. 10B), and then the second press-fitting part 34b is opposed to the intake valve arrangement space 40D. Press fitting is performed (see FIG. 10C). At this time, the first press-fit part 34a is positioned on the X2 direction side of the cylinder head 12 by being supported at a predetermined distance from the second press-fit part 34b.

  Thereafter, the first and second press-fit portions 34a and 34b are moved integrally to perform press-fitting with the first press-fit portion 34a facing the intake valve arrangement space 40A, and at the same time, the second press-fit portion 34b is arranged as an intake valve. Press-fitting is performed facing the space 40E (see FIG. 10D). Finally, press-fitting is performed with the first press-fit portion 34a opposed to the intake valve arrangement space 40B, and press-fitting is performed with the second press-fit portion 34b opposed to the intake valve arrangement space 40F (see FIG. 10E). Thereby, the press-fitting device 10 can press-fit the valve guide G and the valve seat S into all the six intake valve arrangement spaces 40A to 40F of the cylinder head 12 in a short time (see FIG. 10F).

  The press-fitting device 10 according to the present embodiment is basically configured as described above. Next, a press-fitting method of the valve guide G and the valve seat S using the press-fitting device 10 will be described.

  Before the press-fitting operation, the press-fitting device 10 waits for the first transport device 18 in advance at the first standby position A1 and waits for the second transport device 22 in advance at the second standby position B1. At this time, as shown in FIG. 4A, the movable table 70 and the conveyance rail 54 are pushed upward by the hydraulic device 56, the guide jig 52 is retracted to the upper position, and the placement surface 74 a is below the conveyance rail 54. Located on the side. That is, spaces that can receive the cylinder head 12 are constructed at the first and second standby positions A1 and B1. And each conveyance rail 54 of the 1st and 2nd conveyance apparatuses 18 and 22 is in the state in which it corresponded with the conveyance height of each conveyor 16,20,24.

  In the press-fitting method of the press-fitting device 10, an operator first sets the valve guide G and the valve seat S on the first jig 48 (step S1: initial part setting step). Specifically, the valve guide G is inserted into the guide hole 64 a of the guide holding mechanism 64 of the guide jig 52, and the valve seat S is mounted on the holding body 72 a of the sheet holding mechanism 72 of the sheet jig 60.

  As shown in FIG. 1, when the cylinder head 12 is supplied to the upstream conveyor 16, the upstream conveyor 16 is driven to convey the cylinder head 12 in the X1 direction (step S2: first workpiece conveyance process). The cylinder head 12 is guided linearly to the first standby position A <b> 1 with the yaw operation and the like regulated by a guide member 58 provided on the upstream conveyor 16. Then, the cylinder head 12 is placed on the transport rail 54 at the first standby position A1, so that the movement of the cylinder head 12 stops.

  Next, as shown in FIG. 3, the press-fitting device 10 drives the hydraulic device 56 to displace the movable table 70 and the conveyance rail 54 downward, and the cylinder head between the guide jig 52 and the sheet jig 60. 12 is fixed (step S3: first fixing step). Specifically, the conveyance head 54 is moved downward by the hydraulic device 56 so that the cylinder head 12 is placed on the base 74 of the sheet jig 60. On the other hand, the movable base 70 is moved to a lower side than the transport rail 54 by the hydraulic device 56 and presses the upper part of the cylinder head 12. As a result, the cylinder head 12 can be sandwiched between the movable base 70 and the base 74, and the cylinder head 12 can be firmly fixed. In a fixed state of the cylinder head 12, a part of the seat holding mechanism 72 enters the combustion space 38 of the cylinder head 12, and the axis O1 of the intake valve arrangement space 40 and the axis of the seat holding mechanism 72 are coaxial.

  After the cylinder head 12 is fixed, the press-fitting device 10 drives the angle adjusting mechanism 82 to tilt the cylinder head 12 until the axis O1 of the intake valve arrangement space 40 becomes vertical as shown in FIG. 6A (step S4). : 1st inclination process). The angle adjusting mechanism 82 tilts the tilting table 62 to tilt the guide jig 52, the sheet jig 60, the hydraulic device 56, the guide member 58, and the like provided on the tilting table 62 integrally.

  Next, as shown in FIG. 6B, the first transport device 18 drives the transport motor 86 of the linear drive mechanism 80 to slide the mounting portion 18a in the Y1 direction to move the cylinder head 12 to the first position. Transport to the press-fitting position A2 (step S5: first transport process). When the mounting portion 18a slides, the cam roller 68c comes into contact with the cam rail 68d and rolls, and the guide holding mechanism 64 and the holding block 66 approach the movable table 70 along the inclined surface of the cam rail 68d. Thereby, at the first press-fitting position A2, the lower end portion of the guide holding mechanism 64 faces the intake valve arrangement space 40 of the cylinder head 12, and the axis of the guide holding mechanism 64 is coaxial with the axis O1 of the intake valve arrangement space 40. .

  Thereafter, the press-fitting device 10 press-fits the valve guide G and the valve seat S into the intake valve arrangement space 40 of the cylinder head 12 by the press-fitting portion 34 of the press machine 36 (step S6: first press-fitting process). As shown in FIGS. 8A to 9B, the press-fitting of the valve guide G and the valve seat S is performed by advancing the press-fitting rod 126 and the press-fitting block 130 of the press machine 36. The press-fitting of the valve guide G and the valve seat S is performed for all six intake valve arrangement spaces 40.

  Further, during the first press-fitting process, the worker moves to the second standby position B1 and sets the valve guide G and the valve seat S to be press-fitted into the exhaust valve arrangement space 42 on the second jig 50 (step S7: second). 1 set process). The method for setting the valve guide G and the valve seat S is the same as the initial part setting step. Note that the first setting process is not limited to the first press-fitting process, and for example, an operator may perform the first setting process at an appropriate timing between the first fixing process and the first fixing releasing process described later.

  After the first press-fitting process, the press-fitting device 10 returns the cylinder head 12 from the first press-fitting position A2 to the first standby position A1 as shown in FIG. 1 (step S8: first transport return process). That is, the cylinder head 12 is moved to the first standby position A1 by driving the conveyance motor 86 of the first conveyance device 18 and sliding the mounting portion 18a in the Y2 direction. The guide holding mechanism 64 and the holding block 66 that are close to the movable table 70 at the first press-fitting position A2 are separated from the movable table 70 with the movement to the first standby position A1.

  After the first transport return process, the first transport device 18 drives the angle adjustment mechanism 82 to return the tilting table 62 to the horizontal position so that the attitude of the cylinder head 12 is also leveled (step S9: first tilt return process). . Further, by driving the hydraulic device 56, the movable base 70 and the transport rail 54 are moved upward to release the cylinder head 12 (step S10: first fixing release step).

  Thereafter, the cylinder head 12 at the first standby position A1 is transferred to the second standby position B1 via the intermediate conveyor 20 (step S11: second workpiece transfer step). In the second standby position B1, in order to press-fit the valve guide G and the valve seat S into the exhaust valve arrangement space 42, steps similar to steps S3 to S10 described above are performed.

  That is, the press-fitting device 10 fixes the cylinder head 12 to the second transport device 22 via the second jig 50 (Step S12: second fixing step). Thereafter, the tilt of the cylinder head 12 is adjusted by the angle adjusting mechanism 82 of the second transport device 22 (step S13: second tilting step). In the second tilting step, the second transport device 22 tilts the cylinder head 12 in the opposite direction to the first transport device 18 so that the axis O2 of the exhaust valve arrangement space 42 of the cylinder head 12 is vertical.

  The press-fitting device 10 according to the present embodiment is configured to implement the slide movement of the press machine 36 using the start of step S13 as a trigger. That is, in Step S14, the press-fitting device 10 linearly moves the press-fitting portion 34 located at the first press-fitting position A2 to the second press-fitting position B2 by driving the press machine moving mechanism 102 of the press machine 36. (Press-fit part moving process). At this time, the press machine 36 is easily slid to the second press-fitting position B <b> 2 by being guided along the rail 32.

  On the other hand, the 2nd conveying apparatus 22 conveys the cylinder head 12 to 2nd press-fit position B2 after a 2nd inclination process (step S15: 2nd conveying process). Then, the press-fit portion 34 positioned at the second press-fit position B2 in step S13 press-fits the valve guide G and the valve seat S into the exhaust valve arrangement space 42 (step S16: second press-fit process). The press-fitting of the valve guide G and the valve seat S is performed for all six exhaust valve arrangement spaces 42. Thereby, in the cylinder head 12, the valve guide G and the valve seat S are press-fitted into all of the intake valve arrangement space 40 and the exhaust valve arrangement space 42.

  Further, during the second press-fitting process, the worker moves to the first standby position A1 and sets the valve guide G and the valve seat S to be press-fitted into the intake valve arrangement space 40 in the first jig 48 (step S17: Second setting step). If the valve guide G and the valve seat S are set in another jig while the press-fitting portion 34 is operating as described above, the working time of the worker can be effectively utilized, so that the cylinder head 12 Productivity can be improved. Note that the second setting process is not limited to the second press-fitting process, as in the first setting process, and for example, the worker is at an appropriate timing between the second fixing process and the second fixing releasing process described later. You can go.

  After the second press-fitting process, the cylinder head 12 is returned from the second press-fitting position B2 to the second standby position B1 (step S18: second transport return process). Then, the tilt of the cylinder head 12 is returned to the horizontal level (step S19: second tilt return process), and the cylinder head 12 is unlocked (step S20: second fix release process). Finally, the cylinder head 12 at the second standby position B1 is sent to the downstream conveyor 24 (step S21: third transport process). Thereby, the press-fitting device 10 completes the press-fitting of the valve guide G and the valve seat S into the cylinder head 12.

  In addition, you may implement the implementation timing of a press-fit part movement process other than the timing of said step S13. If the press-fitting part moving step is performed particularly during the steps S8 to S13, the operation of the press-fitting device 10 can be performed efficiently.

  As described above, according to the press-fitting device 10 and the press-fitting method according to the present embodiment, the press-fitting part 34 moves along the rail 32 that linearly extends between the first press-fitting position A2 and the second press-fitting position B2. Thus, positioning can be performed efficiently and accurately. That is, the press-fit portion 34 is placed at the second press-fit position B2 only by sliding movement in the X1 direction after performing a press-fit operation into the intake valve placement space 40 at the first press-fit position A2. Even when the press-fit portion 34 moves from the second press-fit position B2 to the first press-fit position A2, positioning is possible only by sliding movement in the X2 direction.

  Here, for example, when the press-fitting part is constituted by an articulated robot hand or the like, positioning of the press-fitting part becomes difficult, and the possibility that the press-fitting quality varies. On the other hand, in the press-fitting device 10 according to the present embodiment, since the press machine 36 moves on the rail 32, the energy required for positioning the press-fitting part 34 is greatly reduced, and the positioning of the press-fitting part 34 is simplified. To do. Furthermore, the linear rail 32 can make the moving distance of the press machine 36 the shortest. As a result, the positioning accuracy of the press-fit portion 34 and the cylinder head 12 is improved, and the time required for positioning can be shortened.

  Further, the press-fitting device 10 can improve the operation rate of the entire device by the press-fitting portion 34 press-fitting the valve guide G and the valve seat S into both the intake valve arrangement space 40 and the exhaust valve arrangement space 42. In this case, it is possible to unify the press-fitting accuracy with respect to the intake valve arrangement space 40 and the exhaust valve arrangement space 42 by once calibrating the press-fitting portion 34. Therefore, the quality after press-fitting can be stabilized and the calibration time and cost can be reduced.

  Further, in the first fixing step, the valve guide G and the valve seat S are easily opposed to the intake valve arrangement space 40 by fixing the cylinder head 12 to the first transport device 18 via the first jig 48. Can do. Thereby, the press-fitting by the press-fitting part 34 can be urged smoothly. The same effect can be obtained in the second fixing step.

  Further, by performing the first tilting process (or the second tilting process), it is not necessary to tilt the press-fitting portion 34 side even in the cylinder head 12 in which the intake valve arrangement space 40 and the exhaust valve arrangement space 42 are non-parallel. Therefore, the structure of the press machine 36 having the press-fit portion 34 can be further simplified, and the failure frequency and cost of the press machine 36 can be reduced.

  In the above description, the present invention has been described with reference to preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Yes.

DESCRIPTION OF SYMBOLS 10 ... Press-fit apparatus 12 ... Cylinder head 18 ... 1st conveying apparatus 22 ... 2nd conveying apparatus 32 ... Rail 34 ... Press-fit part 36 ... Press machine 40 ... Intake valve arrangement space 42 ... Exhaust valve arrangement space 48 ... 1st jig | tool 50 ... second jig 52 ... guide jig 60 ... sheet jig 70 ... movable base 82 ... angle adjusting mechanism 102 ... pressing machine moving mechanism A1 ... first standby position A2 ... first press-fit position B1 ... second standby position B2 ... Second press-fit position G ... Valve guide S ... Valve seat

Claims (7)

A press-fitting method for press-fitting a valve guide and a valve seat into a cylinder head having a first space portion in which one of an intake valve and an exhaust valve is disposed and a second space portion in which the other is disposed,
A first conveying step of conveying the cylinder head to a first press-fit position;
A first press-fitting step in which the press-fitting part simultaneously press-fits the valve guide and the valve seat into the first space part of the cylinder head conveyed to the first press-fitting position;
A second conveying step of conveying the cylinder head to a second press-fitting position provided at a location different from the first press-fitting position;
A press-fit portion moving step of slidingly moving the press-fit portion along a rail linearly extending between the first press-fit position and the second press-fit position;
The press-fitting portion that has moved from the first press-fitting position to the second press-fitting position presses the valve guide and the valve seat simultaneously into the second space portion of the cylinder head that has been transported to the second press-fitting position . A press-fitting method comprising two press-fitting steps. The press-fitting method according to claim 1,
Before carrying out the first conveying step, the cylinder head is fixed to the first conveying device via the first jig in which the valve guide press-fitted into the first space and the valve seat are set. A fixing process;
Before the second transport step, the cylinder head is fixed to the second transport device through a second jig in which the valve guide and the valve seat that are press-fitted into the second space are set. A press-fitting method comprising: a fixing step. The press-fitting method according to claim 2,
After the first fixing step, a first inclining step in which the first transport device inclines the cylinder head so that the shaft centers of the valve guide and the valve seat coincide with the advance direction of the press-fitting member of the press-fitting portion. ,
After the second fixing step, the second conveying device includes a second inclining step in which the second conveying device inclines the cylinder head so that the axial centers of the valve guide and the valve seat coincide with the advance direction of the press-fitting member. A press-fitting method characterized by The press-fitting method according to claim 2 or 3,
During the execution of the first press-fitting step, a first setting step of setting the valve guide and the valve seat that are press-fitted into the second space portion in the second jig,
A press-fitting method, comprising: a second setting step of setting the valve guide and the valve seat that are press-fitted into the first space portion into the first jig during the execution of the second press-fitting step. A press-fitting device for press-fitting a valve guide and a valve seat into a cylinder head having a first space portion in which one of an intake valve and an exhaust valve is disposed and a second space portion in which the other is disposed,
A first transfer device for transferring the cylinder head to a first press-fit position;
A second transport device that transports the cylinder head to a second press-fit position provided at a location different from the first press-fit position;
The valve guide and the valve seat are simultaneously press-fitted into the first space portion of the cylinder head disposed at the first press-fitting position and conveyed to the first press-fitting position, and from the first press-fitting position to the first A press-fitting portion for simultaneously press-fitting the valve guide and the valve seat into the second space portion of the cylinder head moved to the second press-fitting position and conveyed to the second press-fitting position;
A press-fitting device comprising: a rail that allows the press-fitting portion to slide linearly between the first press-fitting position and the second press-fitting position. The press-fitting device according to claim 5,
The first transfer device can fix the cylinder head via a first jig in which the valve guide and the valve seat that are press-fitted into the first space portion are set,
The press-fitting device, wherein the second transport device can fix the cylinder head via a second jig in which the valve guide and the valve seat that are press-fitted into the second space portion are set. The press-fitting device according to claim 6,
The first and second transport devices each include an angle adjustment mechanism that inclines the cylinder head so that the axis centers of the valve guide and the valve seat coincide with the advancing direction of the press-fitting member of the press-fitting portion. Press-fitting device.

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