JP4483735B2 - Assembly abnormality detecting device and assembly abnormality detecting method for lift amount adjusting mechanism in valve operating mechanism - Google Patents

Description

The present invention relates to assembling the abnormality detection apparatus and assembling method for detecting abnormality lift adjusting mechanism in a valve operating mechanism for an internal combustion engine, especially in equipment which attained automation of lift of the measurement and adjustment operations, attached to the valve mechanism In particular, the present invention relates to a technique capable of detecting in advance an assembly abnormality of a predetermined part that constitutes a lift amount adjusting mechanism .

  As described in Patent Document 1, a drive cam provided on a drive shaft that rotates in conjunction with a crankshaft, and a valve for intake or exhaust of an engine supported by the drive shaft so as to be swingable are lifted. The swing cam and a control shaft different from the drive shaft are provided so as to be swingable. One end is connected to the drive cam via the first link member, and the other end is connected to the swing cam via the second link member. A variable movement of the internal combustion engine, which includes a rocker arm connected to each other, and controls the rotational position of the control shaft in accordance with the engine operating state, thereby variably controlling the valve lift by changing the rocking fulcrum of the rocker arm. A valve mechanism has been proposed.

Further, on the premise of the technique described in Patent Document 1, a patent application is made in which a lift amount adjusting mechanism is provided at a connecting portion between the rocker arm and the second link member so that the lift amount of the variable valve mechanism can be adjusted. 2004-332623 has been proposed by the present applicant. More specifically, due to the influence of the processing dimensional accuracy of the individual parts that make up the variable valve mechanism, the dimensional accuracy between the connecting points of the link mechanism may vary, resulting in variations in valve operation timing and lift amount. Therefore, in order to absorb or adjust this, the lift amount adjusting mechanism is attached.

The lift amount adjusting mechanism adjusts the lift amount in addition to the connecting pin that connects the rocker arm and the second link member, as well as an adjusting screw that finely adjusts the position of the connecting pin and a lock screw that locks the connecting pin. The adjusting screw and the locking screw are both arranged on the same axis.
JP 2002-256832 A

In the variable valve mechanism that can adjust the lift amount as described above, the valve lift amount can be measured with the variable variable valve mechanism incorporated in the cylinder head or a jig equivalent to it in the same manner as in the actual engine assembly state. Since the subsequent adjustment work is automatically performed, the precondition is that parts such as a connecting pin, a lock screw, and an adjustment screw that constitute the lift amount adjustment mechanism must be correctly assembled in advance.

However, since the structure of the variable valve mechanism is complicated, its assembly is performed manually, and the final confirmation of the assembly state of the connecting pin, lock screw and adjusting screw constituting the lift amount adjusting mechanism is also performed. Since it is performed by visual inspection, if an assembly error such as dropping or misalignment of the connecting pin or lock screw is missed, the automated lift measurement and adjustment device will not operate correctly. It will stop. As a result, it takes a long time to stop or restore the equipment, resulting in a decrease in production efficiency.

In the valve operating mechanism described in Japanese Patent Application No. 2004-332623 previously exemplified, as the assembly abnormality of the lift amount adjusting mechanism (1) of the adjusting screw falling off, (2) excessive loosening of the adjusting screw, (3) It is assumed that the lock screw is dropped, (4) the lock screw is excessively loosened, (5) the connecting pin is dropped, and (6) the rotational position of the connecting pin is shifted.

The present invention has been made paying attention to such a problem, and in particular, when the measurement and adjustment of the lift amount of the valve mechanism is performed by an automated facility, the connecting pin constituting the lift amount adjustment mechanism The present invention provides a technique capable of detecting an assembly abnormality such as dropout or misalignment in advance.

The invention according to claim 1 is a valve operating mechanism in which a drive shaft that rotates in conjunction with a crankshaft and a swing cam that lifts an intake or exhaust valve of an engine are linked by a plurality of links. In the lift amount adjustment mechanism attached to the above-mentioned lift amount adjustment mechanism, the connection pin that connects at least two links so as to be relatively rotatable with each other is press-fixed with a lock screw and an adjustment screw . and by tightening the lift temporarily loosen again adjusted lock screw after adjusting the position of the connecting pin by the rotation operation of the screw lock screw when the adjustment be adapted to clamping secure the connecting pin, it is assumed that a device for detecting an assembling abnormality of the lift amount adjusting mechanism.

In addition, a lock screw operating means for rotating the lock screw, an adjustment screw operating means having an operation jig fitted to the adjustment screw, and rotating the adjustment screw with the operation jig, and a lock screw operating means the magnitude of the seating torque generated lock screw when temporary tightening operation, the size of the seating torque generated when the temporary clamping operation the adjustment screw by adjustment screw operating means, and said after temporary tightening operation of the adjusting screw And determining means for determining whether or not the connecting pin, the lock screw, and the adjustment screw are assembled abnormally based on combination information with position information of the operation jig in the screwing direction of the adjustment screw. And

In this case, preferably, as described in claim 2, both the lock screw and the adjustment screw in the lift amount adjusting mechanism are arranged on the same axis, and both the lock screw and the adjustment screw are operated from the same direction. It assumed to become possible, further, more desirably, as described in claim 3, threadedly advancing direction of the adjustment screw when the adjustment screw and rotating the adjustment screw with a work tool in order to operate temporarily tightened It is assumed that it has a detecting means for detecting the position of the operation jig.

In addition, as a more specific structure of the valve operating mechanism, as described in claim 4, the drive shaft rotates in conjunction with the crankshaft and is provided with a drive cam, and is swingably supported by the drive shaft. And a swing cam for lifting the intake or exhaust valve of the engine, a control shaft parallel to the drive shaft, and swingable on the control shaft, one end of which is provided via the first link member. And a rocker arm having the other end connected to the swing cam via the second link member, and the rotational position of the control shaft is controlled in accordance with the engine operating state. A variable valve type in which the valve lift amount is variably controlled by changing the swing fulcrum, and a lift amount adjusting mechanism is provided at the connecting portion between the rocker arm and the second link member; Do

Connecting pin constituting the lift amount adjusting mechanism, as set forth in claim 5, it is assumed that couples the rocker arm and the second link member.

The invention described in claim 6 is a technique for detecting the assembling abnormality of the lift amount adjusting mechanism according to the technique described in claim 1, wherein the seating torque generated when the lock screw is temporarily tightened. the size, the size of the seating torque generating adjustment screw with a work tool fitted to the adjusting screw when the temporary tightening operation, and after the initial tightening operation of the adjusting screw in the screwed direction of the adjusting screw operation Osamu Based on the combination information with the tool position information, it is determined whether or not the connecting pin, the lock screw, and the adjusting screw are assembled abnormally.

Thus, in the invention according to at least claim 1, 6, for example, when a valve operating mechanism in question is of the variable valve type as described in claim 4 and 5, when the locking screw temporary tightening operation the combination of the size of the seating torque, the position information of the adjustment screw temporarily tightened size of the seating torque generated during operation, and adjustment screws temporary tightening work tool in the screwing direction of the adjusting screw after the operations that occur If the assembly abnormality of the lift amount adjusting component is determined based on the information, (1) the adjustment screw is dropped, (2) the adjustment screw is loosened, (3) the lock screw is dropped, (4) It is possible to individually identify (1) loosening of the lock screw, (5) dropping of the connecting pin, and (6) rotational position shift of the connecting pin.

According to the first and sixth aspects of the present invention, it is possible to detect in advance and individually an assembly abnormality such as a dropout or misalignment of the connecting pin, the lock screw, and the adjustment screw constituting the lift amount adjustment mechanism . This eliminates the need for equipment breakdown and restoration work, and improves the production efficiency of automated equipment for measuring and adjusting the lift amount.

  FIG. 1 and the following drawings show a more specific embodiment of the present invention. Here, for example, a variable valve mechanism applied to an intake system of a V-type 6-cylinder engine is shown.

  1 to 4, as an example of a variable valve mechanism provided on the cylinder head 1, both the lift amount and the operating angle of the intake valve 2 are continuously controlled while opening and closing the two intake valves 2 per cylinder. The structure of the variable lift / operating angle (valve event) variable mechanism 3 that can be variably controlled is shown. The lift / operating angle variable mechanism 3 has been previously proposed by the present applicant as Japanese Patent Application Laid-Open No. 2002-256832.

  The lift / operating angle variable mechanism 3 includes a drive shaft 4 that rotates in conjunction with a crankshaft (not shown), and a swing cam 5 that is swingably fitted to the drive shaft 4 and lifts the intake valve 2. Are linked by a plurality of links 10 and 11 in addition to a rocker arm 9 described later. More specifically, the lift / operating angle variable mechanism 3 includes a circular eccentric cam 6 that is provided eccentric to the drive shaft 4 and functions as a drive cam, a control shaft 7 that is provided in parallel to the drive shaft 4, and this control. A circular eccentric cam 8 that is eccentrically provided on the shaft 7, a rocker arm 9 that is swingably fitted to the eccentric cam 8, and the eccentric cam 6 on the drive shaft 4 side and one end of the rocker arm 9 are connected. It has a ring-shaped first link 10 as a first link member, and a second link 11 as a second link member connecting the other end of the rocker arm 9 and the tip of the swing cam 5. Yes.

  The drive shaft 4 is linked to a crankshaft via a transmission mechanism such as a chain or pulley (not shown) and is driven to rotate in conjunction with the crankshaft, while the control shaft 7 is a rotary type (not shown) such as a servo motor. The rotational position is arbitrarily variably controlled by the actuator.

  The first link 10 is rotatably fitted to the outer periphery of the eccentric cam 6 on the drive shaft 4 side, while one end of the rocker arm 9 and the tip of the first link 10 are rotatably connected by a first connecting pin 12. Has been. The other end of the rocker arm 9 and one end of the second link 12 are rotatably connected by a second connecting pin 13. Further, the other end of the second link 11 and the tip of the swing cam 5 are rotatably connected by a third connecting pin 14. Here, as is apparent from FIG. 4, the swing cam 5 is formed by coaxially forming two independent cam bodies 5a and 5b for each intake valve 2, and one cam body 5a has The second link 11 is connected via a third connecting pin 14.

  As shown in FIGS. 1 and 2, the drive shaft 4 and the control shaft 7 are rotatably supported on the upper portion of the cylinder head 1. The cylinder head 1 has a so-called ladder frame structure ladder cam bracket 1b in which a plurality of bearing caps are formed integrally with a frame-like frame on the upper surface of a head lower 1a that functions as a head body. The functioning ladder cam bracket 1 b is fastened and fixed to the head lower 1 a by a plurality of mounting bolts 15. The drive shaft 4 and the control shaft 7 extend in the cylinder row direction while maintaining a parallel state, and the drive shaft 4 is supported by bearings so as to be sandwiched between the head lower 1a and the ladder cam bracket 1b. 7 is mounted on the upper surface of the ladder cam bracket 1b and supported by a bearing cap 16 that is bolted and fixed to the ladder cam bracket 1b.

  As described above, the drive shaft 4 and the control shaft 7 extending in the cylinder row direction are shared by a plurality of cylinders constituting the cylinder row, whereas the components of the lift / operating angle variable mechanism 3 are used. The rocking cam 5, the rocker arm 9, the first link 10, the second link 11 and the like are provided independently for each cylinder constituting the cylinder row.

  In such a lift / operating angle variable mechanism 3, when the drive shaft 4 rotates in conjunction with the crankshaft, the rocker arm 9 swings through the eccentric cam 6 and the first link 10, and the rocker arm 9 swings. The motion is transmitted to the swing cam 5 via the second link 11, and the swing cam 5 swings. Then, as the swing cam 5 swings, the valve lifter 17 provided above the intake valve 2 comes into contact with and presses the valve lifter 17, so that the intake valve 2 reacts to the reaction force of the valve spring 18 (see FIG. 2). In contrast, an opening / closing operation, that is, a lift operation is performed.

  On the other hand, when the rotational position of the control shaft 7 is changed by the operation of the rotary actuator, the center position of the eccentric cam 8 which is the rocking fulcrum of the rocker arm 9 changes. As a result, the swing range of the swing cam 5 changes, and the lift phase (maximum) of the intake valve 2 remains constant while the central phase of the operating angle of the intake valve 2 with respect to the crank angle (rotational position of the crankshaft) remains substantially constant. Both the lift amount and the operating angle change continuously and steplessly. The control state of the lift / operating angle variable mechanism 3 is detected by, for example, a control axis sensor (lift sensor) that is an angle sensor that responds to the rotational position of the control shaft 7.

  According to the lift / operating angle variable mechanism 3 as described above, for example, by using a minimal lift region where the lift amount is 1 mm or less, the intake air amount can be widely adjusted without depending on the throttle valve. Loss can be greatly reduced or eliminated. However, in such a minimal lift region, a slight lift amount variation between cylinders appears as a relatively large intake air amount variation, so that the lift amount falls within a predetermined control limit (within dimensional tolerance). It is important to make adjustments with high accuracy and to minimize the variation in lift amount between cylinders.

  In the present embodiment, the lift amount is adjusted by adjusting the position of the second connecting pin 13 that connects the rocker arm 9 and the second link 11 constituting the lift / operating angle variable mechanism 3. Adjustment is possible.

  5 to 7 show a pin connecting portion between the rocker arm 9 and the second link 11. The rocker arm 9 has a deformed arm shape having an annular portion 19 that is rotatably fitted to the eccentric cam 8 on the control shaft 7 side, and has a first portion serving as a coupling portion with the first link 10 at one end. In addition to one connecting pin 12 projecting integrally, an arm end 20 that functions as a connecting portion with the second link 11 is integrally formed at the other end. The arm end 20 is formed with an elongated hole insertion hole 21 into which the second connecting pin 13 is inserted.

  The first connecting pin 12 and the arm end 20 are offset from each other in the axial direction of the annular portion 19. In addition, since the short diameter of the pin insertion hole 21 formed in the arm end 20 is substantially matched with the longitudinal direction of the rocker arm 9 itself, the pin insertion hole 21 can be moved in the long diameter direction of the second connection. The pin 13 will be received.

  In the arm end 20 into which the second connecting pin 13 is inserted, an adjustment bolt 22 that functions as an adjustment screw and a lock bolt 23 that functions as a lock screw are inserted into a long hole pin. The holes 21 are opposed to each other so as to be positioned on the same axis with the hole 21 therebetween. In other words, the arm end 20 is formed with female screws 24 and 25 that open into the pin insertion hole 21, the adjustment screw 22 with a hexagonal hole 26 is provided on one screw 24, and the other female screw 25 is provided on the other female screw 25. Lock bolts 23 each having a hexagonal head 27 are screwed together.

  Here, since the adjusting bolt 22 is to rotate the hexagonal wrench type bit 28 shown in FIG. 3 by inserting and fitting it into the hexagonal hole 26, the bit 28 is inserted from the direction of the lock bolt 23. As possible, the lock bolt 23 has a through hole 29 and is hollow. On the other hand, the second connecting pin 13 to be inserted into the pin insertion hole 21 is formed with a two-sided width portion 30 as shown in FIG. Similar to the lock bolt 23, a through hole 31 is formed.

  As apparent from FIG. 5, the bifurcated side piece 11a at one end of the second link 11 is formed with a pin hole 32 that can be fitted to the second connecting pin 13, so that the bifurcated shape. After the arm end 20 is sandwiched between the side piece portions 11a and 11a, the pin insertion hole 21 and the pin hole 32 are matched, and the second connecting pin 13 is inserted into the pin insertion hole 21 and the pin hole 32. Is inserted. Further, the adjustment bolt 22 and the lock bolt 23 are tightened from above and below the second connecting pin 13 inserted into the pin insertion hole 21 and seated on the two-surface width portion 30, so that Two connecting pins 13 are fixed by pressing. Thereby, the two-surface width portion 30 functions as a seating surface on which the adjustment bolt 22 and the lock bolt 23 are seated.

  In addition, the end face of the second connecting pin 13 is formed with a long hole-like depression 33 having a long diameter in the same direction as the pin insertion hole 21. By matching the long diameters of both the long holes, the second It is considered that the two-surface width portion 30 of the connecting pin 13 can be matched with the major axis direction. Therefore, in this state, the through hole 29 of the lock bolt 23 and the through hole 31 of the second connecting pin 13 as well as the hexagonal hole 26 of the adjusting bolt 22 communicate with each other on the same axis.

As described above, the rocker arm 9 and the second rocker arm 9 are connected to the rocker arm 9 through the second connecting pin 13 that is normally movable in a predetermined position but cannot be rotated, although it is movable along the long hole-shaped pin insertion hole 21. The link 11 is connected to the link 11 so as to be relatively rotatable , and the lift amount adjusting mechanism 145 is composed of the second connecting pin 13, the adjustment bolt 22 and the lock bolt 23, which are the main functional parts involved in the lift amount adjustment. Forming.

  In order to adjust the valve lift amount of the variable lift / operating angle mechanism 3 as described above, the link length of the second link 11 connecting the rocker arm 9 and the swing cam 5 is adjusted.

  Prior to this, after the control shaft 7 is indexed to the rotational position where the lift amount of each lift / working angle variable mechanism 3 is minimized, the drive shaft 4 is rotated at a low speed, and each lift / working angle at that time is variable. The lift amount for each mechanism 3 is measured in advance, and the necessary lift adjustment amount is grasped in advance.

  Subsequently, as shown in FIG. 3, the hexagonal socket 34 is fitted to the head 27 of the lock bolt 23 and then loosened by rotating the hexagonal socket 34 in the major axis direction of the elongated pin insertion hole 21. While giving the degree of freedom of the position of the second connecting pin 13, the bit 28 is inserted from the lock bolt 23 side and fitted into the hexagonal hole 26 of the adjusting bolt 22. Then, the adjustment bolt 22 is rotated by a predetermined amount in the forward rotation direction or the reverse rotation direction, that is, the adjustment bolt 22 is rotated by an amount necessary for the lift adjustment amount grasped in advance, and the second connecting pin After adjusting the position of 13, the lock bolt 23 is tightened again to fix the second connecting pin 13. By doing so, the link length of the second link 11 connecting the rocker arm 9 and the swing cam 5, that is, the distance between the shaft centers of the second connecting pin 13 and the third connecting pin 14 is changed. As a result, the lift amount and operating angle of the lift / operating angle variable mechanism 3 can be adjusted.

  Thus, according to the lift / operating angle variable mechanism 3, it is considered that the rotation operation of the lock bolt 23 by the socket 34 and the rotation operation of the adjustment bolt 22 by the bit 28 can be performed from the same or a single direction. Therefore, the lift amount can be adjusted very easily.

  Here, as shown in FIG. 2, prior to the adjustment of the lift amount of each lift / working angle variable mechanism 3, the control shaft 7 is determined so that the lift amount of each lift / working angle variable mechanism 3 is minimized. In this case, it is desirable to improve the workability and operability of adjusting the lift amount so that the head 27 of each lock bolt 23 is set in advance so as to be positioned above the upper surface of the ladder cam bracket 1b.

  The lift amount adjusting mechanism as described above is the content previously filed by the present applicant as Japanese Patent Application No. 2004-332623.

  Next, an example of an apparatus that automates the measurement and adjustment of the lift amount of the lift / operating angle variable mechanism 3 as described above will be described.

When measuring and adjusting the valve lift amount in the lift / operating angle variable mechanism 3, the valve end face facing the combustion chamber in the state where the lift / operating angle variable mechanism 3 is assembled to the cylinder head 1 is used as the lift amount measuring portion. In many cases, the same part remains so-called black skin, and there is a limit to the improvement in the measurement accuracy of the lift amount before the lift amount adjustment .

  Therefore, in the present embodiment, when measuring and adjusting the valve lift amount of the lift / operating angle variable mechanism 3 in the state of the mechanism alone, the lift / operating angle variable mechanism 3 is not assembled to the cylinder head 1. It is assumed that a dedicated positioning jig 50 simulating the shape of the head lower 1a is used, and at the same time, the lift amount is measured using the cam surface of the rocking cam 5 instead of the valve end face as the lift measurement site.

  8 and 9 show the details of the positioning jig 50. As is clear from comparison with FIGS. 1 and 2, the positioning jig 50 is almost identical in shape to the head lower 1a of the regular cylinder head 1. FIG. However, only the portion corresponding to the valve insertion hole is penetrated by, for example, a through hole 51 having the same size as the diameter of the valve lifter 17, and this through hole 51 is inserted with a lift amount measuring means for measuring the valve lift amount as will be described later. It will function as a hole. That is, the positioning jig 50 is cast using a regular head lower casting mold, and then the upper and lower surfaces to be joined to the cylinder block and the ladder cam bracket are processed, various mounting holes and locating holes are processed, The journal portion is processed in the same manner as the regular head lower 1a, and the through hole 51 is formed in the portion corresponding to the valve insertion hole described above.

  Then, as shown in FIGS. 8 and 9, each lift / operating angle variable mechanism 3 is temporarily assembled in advance with the ladder cam bracket 1b as a base. That is, if the control shaft 7 is placed on the ladder cam bracket 1b and the bearing cap 16 for the control shaft 7 is bolted and fixed to the ladder cam bracket 1b, the first and second links 10 and 11 are connected. As long as the drive shaft 4 is correctly connected, the drive shaft 4 does not fall off from the ladder cam bracket 1b. Then, as shown in FIG. 9, the drive shaft 4 is placed on the journal portion of the positioning jig 50 together with the ladder cam bracket 1 b to be primarily positioned. However, as is clear from comparison with FIG. 2, the ladder cam bracket 1 b is not fixed to the positioning jig 50 with the mounting bolt 15. With the above, preparations for measuring and adjusting the valve lift amount of the lift / operating angle variable mechanism 3 are completed.

  FIG. 10 shows the structure of an apparatus for measuring and adjusting the valve lift amount of the lift / operating angle variable mechanism 3 using the positioning jig 50 in the form of FIGS.

  A horizontal table 53 is arranged on the frame-like frame 52, and this table 53 is raised and lowered by a lifting guide mechanism comprising a guide rod 54 suspended from itself and a guide sleeve 56 erected from the lower frame element 55. Guided support is possible. The positioning jig 50 described above is positioned and placed at a predetermined position in the center of the table 53, and a drive shaft is provided on both sides of the table 53 with the positioning jig 50 interposed therebetween. The drive unit 57 and the toggle clamp mechanism 58 are arranged to face each other.

  A lifter 60 is erected on the lower frame element 55 together with a lift amount measuring unit 59 described later. The lifter 60 is provided with a pair of left and right push-up arms 62 on the lifter table 61. The lift arm 62 is lifted by a lift cylinder 64 so that the push-up arm 62 comes into contact with the contact plate 63 on the table 53 side. The table 53 is lifted up by a predetermined amount.

  On the other hand, the upper frame element 65 of the frame 52 has a plurality of clamp pieces 66 arranged at a position corresponding to the upper side of the positioning jig 50 and a lift amount adjustment operation unit 67 as a lift amount adjustment operation means. It is. As described above, when the table 53 is pushed up by the lifter 60, the positioning jig 50 is firmly positioned and clamped by the push-up arm 62 and the clamp piece 66.

  Here, as shown in FIGS. 1 and 2, each clamp piece 66 has a position of a mounting bolt 15 for fixing the ladder cam bracket 1b to the head lower 1a of the cylinder head 1 (attachment of the ladder cam bracket 1b shown in FIG. 8). The same number of bolt holes are set at the same position as the bolt hole position.

  Accordingly, as described above, when the positioning jig 50 is positioned and clamped with the pressing arm 62 and the clamp piece 66 based on the lift-up operation of the lifter 60 as described above, the lifting force (cylinder of the cylinder) is increased. The fastening force generated when the lift / operating angle variable mechanism 3 is bolted to the cylinder head 1 with a normal torque so that a state equivalent to the actual engine assembly state can be reproduced by appropriately adjusting the output) The lift / operating angle variable mechanism 3 is positioned and fixed to the positioning jig 50 with the same pressing force.

  The lift amount measuring unit 59 on the lower frame element 55 is mounted on a shift table 70 that can move horizontally on the guide rail 69 in accordance with the expansion and contraction operation of the shift cylinder 68, and a guide rod 71 and a guide tube 72 that receives the guide rod 71. And a lift cylinder 73 that is suspended from the shift table 70 and is moved up and down. Then, as shown in FIG. 10, if the lift amount measurement unit 59 is located directly below the rightmost cylinder of the positioning jig 50, the lift amount measurement unit 59 shifts the pitch between cylinders once. The shift operation is possible over a plurality of stages in the cylinder row direction as the pitch.

  The combination of the lift guide mechanism and the lift cylinder 73 composed of the guide rod 71 and the guide tube 72 on the lift amount measuring unit 59 side is similarly adopted on the lifter 60 side.

  Further, the lift amount measuring unit 59 is inserted from a through hole 51 (see FIG. 9) corresponding to the valve insertion hole of the positioning jig 50 as shown in FIG. A pair of measuring elements 74 capable of abutting (see FIGS. 2 to 4) is a main element, and each measuring element 74 is guided and supported by a guide block 75 through a guide bush 77 so as to be lifted and lowered. It is attached to the upper end. On the other hand, the lower end of the guide rod 76 is connected to the piston rod 80 of the preload cylinder 79 via an intermediate plate 78, and the lower end of the guide rod 76 is connected to a linear type displacement via a bolt-shaped contact 81. The input rod 82a of the linear gauge 82 which is a meter is brought into contact. The contact 81 also has a function of fixing the intermediate plate 78 to the guide rod 76.

  Here, the preload cylinder 79 functions as a powerful fluid spring by enclosing a predetermined liquid in the cylinder tube, and always applies an upward biasing force to the guide rod 76. . The spring force of the preload cylinder 79 is set to the same magnitude as the spring force exerted by the valve spring 18 on the valve lifter 17 in the normal engine assembly state as shown in FIG.

  Therefore, when the probe 74 is raised by the extension operation of the lift cylinder 73, the guide rod 76 is inserted into the through hole 51 of the positioning jig 50 as shown in FIG. The valve lift amount is measured in this state as will be described later by pressing against the main bodies 5a and 5b individually. At this time, the spring force of the preload cylinder 79 acts on the swing cam 5, and thereby the force of the valve spring 18 (see FIG. 2) in the engine assembly state in order to reproduce the actual engine assembly state. The measuring element 74 can be pressed against the cam surface of the rocking cam 5 with the same pressing force as.

  In FIG. 10, the drive shaft drive unit 57 disposed on the table 53 is provided with a disk-like drive plate 87 driven by a motor 86 on a slide table 85 that slides on the guide rail 84 by the extension operation of the shift cylinder 83. The drive plate 87 faces the flange 4a (see FIG. 8) at the shaft end of the drive shaft 4 on the same axis as the drive shaft 4. A dowel pin 4b is projected from the flange portion 4a at a position offset from the axis. Further, as the motor 86, a motor having a so-called orienteering (indexing) function that can rotate the drive plate 87 to a specified rotation position and stop at a fixed angle at that position is employed.

  More specifically, as shown in FIG. 12, a holder 88 on a slide table 85 is rotatably supported by a holder 89 via a bearing 89, and the drive shaft 90 is coupled to a rotating shaft 91 of a motor 86 by a coupling 92. It is connected via. Further, a support shaft 92 having a drive plate 87 at its tip is slidably inserted into the drive shaft 90, and a support shaft 92 body is provided by a compression coil spring 93 interposed between the drive plate 87 and the drive shaft 90. Is biased forward. Although the support shaft 92 is slidable with respect to the drive shaft 90, the relative rotation of both is impossible due to the engagement of the pin 94 that penetrates the support shaft 92 in the radial direction and the long hole 95 on the drive shaft 90 side. At the same time, the support shaft 92 can be slid with respect to the drive shaft 90 only within the range of the elongated hole 95. The drive plate 87 is formed with a positioning hole 96 for receiving the dowel pin 4b protruding from the flange portion 4a at the shaft end of the drive shaft 4.

  In FIG. 10, the toggle clamp mechanism 58 on the table 53 is disposed so as to be close to the control shaft 7 on the positioning jig 50 as is apparent from the figure. Has a function of performing a swing operation, indexing the control shaft 7 to a predetermined indexing position and clamping the positioning. More specifically, as shown in FIG. 13A, the shaft end of the control shaft 7 is formed with a substantially elliptical or substantially diamond-shaped flange portion 7a. As shown, a stopper ring 99 is fixed to the control shaft 7 with a set screw 100 so as to be close to the flange portion 7a. The stopper ring 99 is provided to mechanically limit the rotational range of the ladder cam bracket 1b itself when the control shaft 7 is supported by the ladder cam bracket 1b in the normal engine assembly state. (B), the cylindrical surface other than the stopper surfaces 99a and 99b of the stopper ring 99 is supported by the journal 101 on the ladder cam bracket 1b side.

  Therefore, in the state where the lift / operation angle variable mechanism 3 is positioned and supported by the positioning jig 50 as described above, one stopper surface 99a of the stopper ring 99 is seated on the stopper surface 101a on the ladder cam bracket 1b side. Thus, the rotation direction of the control shaft 7 with respect to the ladder cam bracket 1b is indexed and positioned, and the clamp lever 98 of the toggle clamp mechanism 58 described above is connected to one side of the flange portion 7a at the shaft end of the control shaft 7. By pressing against 102 and restraining, one stopper surface 99a of the stopper ring 99 is seated on the stopper surface 101a on the ladder cam bracket 1b side as shown in FIG. It has become.

  Further, a non-contact sensor 102 is provided on the table 53 shown in FIG. 10 in proximity to the toggle clamp mechanism 58. On the other hand, as shown in FIG. 8, since the sensing plate 103 with a projection for detecting the phase of the eccentric cam 6 is provided at the shaft end of the drive shaft 4, the sensor 102 can detect the projection on the sensing plate 103 side. The phase of each eccentric cam 6 is detected by this sensor 102.

  Further, in FIG. 10, a lift amount adjusting operation unit 67 on the upper frame element 65 rotates the adjustment bolt 22 and the lock bolt 23 at the connecting portion between the rocker arm 9 and the second link 11 shown in FIG. For example, as shown in the figure, when the valve lift amount is measured, it stands by at the retracted position indicated by the solid line in FIG. 10, but when the lift amount is adjusted as will be described later. Is slidable in the cylinder row direction to the position of the lock bolt 23 or the like of each lift / operating angle variable mechanism 3.

  More specifically, a vertical slider 160 that can be moved up and down in accordance with the expansion / contraction operation of the lift cylinder 105 is mounted on the slider 106 that can slide on the guide rail 106a according to the expansion / contraction operation of the shift cylinder 104 that can perform a multistage stop operation. Then, the vertical slider 160 functions as a lock screw operating means for operating the nut runner 107 and the lock bolt 23 that function as an adjusting screw operating means for operating the adjusting bolt 22 as shown in FIG. A nut runner 108 is juxtaposed. Further, a gear box 109 is arranged below each nut runner 107, 108. From the gear box 109, a hexagon socket 34 for rotating the lock bolt 23 and a rotating operation of the adjusting bolt 22 are arranged. A hexagonal bit 28 that functions as an operating jig is projected.

  14 shows details of the gear box 109 including the socket 34 and the bit 28, and FIG. 15 shows a bottom view of the main part of FIG. As shown in the figure, on the nut runner 107 side for rotating the adjusting bolt 22, a hollow socket holder 112 is also rotatably supported via a bearing 111 on the outer side of the hollow bearing holder 110. I'm allowed. A driven gear 113 is fixed to the outer periphery of the socket holder 112 through a key 114, and a socket 34 having a hexagonal hole 115 at the tip is inserted in the lower part of the socket holder 112 so as to be movable up and down and not relatively rotatable. That is, the guide protrusion 117 formed on the outer periphery of the socket 34 is slidably engaged with the guide groove 116 formed on the inner periphery of the socket holder 112, and between the inner bottom surface of the socket holder 112 and the socket 34. A compression coil spring 118 is interposed between the socket 34 and the socket 34 so that the socket 34 cannot rotate but can move up and down.

  Similarly, in the socket holder 112, the rotation shaft 119 of the nut runner 107 is connected to the intermediate rod 120 so as not to be relatively rotatable by extrapolating the large diameter portion of the intermediate rod 120. Further, a bit holder 121 is attached to the intermediate rod 120. It is connected so that it cannot be rotated relative to the outside and can move up and down. That is, the intermediate rod 120 and the bit holder 121 are connected to each other so that the intermediate rod 120 and the bit holder 121 are relatively unrotatable and movable in the vertical direction by engaging the pin 122 on the intermediate rod 120 side and the elongated hole 123 on the bit holder 121 side. The bit holder 121 is constantly urged downward by a compression coil spring 124 interposed therebetween. The bit 28 is detachably attached to the tip of the bit holder 121. Therefore, the bit 28 is concentric with the socket 34 and protrudes downward through the socket 34.

  On the other hand, on the nut runner 108 side for rotating the lock bolt 23, an intermediate rod 127 is rotatably supported on the inner peripheral side of the hollow bearing holder 125 via a bearing 126. 127 is connected to the rotary shaft 128 on the nut runner 108 side so as not to be relatively rotatable. A drive gear 129 is fixed to the intermediate rod 127 with a key 130, and the drive gear 129 meshes with the driven gear 113 on the socket holder 112 side. Therefore, when the nut runner 108 is started, the socket 34 is rotated forward or reversely, and conversely, when the nut runner 107 is started, the bit 28 is rotated forward or reversely.

  In addition to the above-described operation control of the lifter 60, the lift amount measurement unit 59, the drive shaft drive unit 57, the toggle clamp mechanism 58, the lift amount adjustment operation unit 67, etc. The detection is controlled by the control panel 140 shown in FIG. At the same time, as will be described later, the control panel 140 also functions as a determination means for detecting an assembly abnormality of the lift amount adjusting component.

  Next, a series of operations of the valve lift amount measuring and adjusting apparatus as described above will be described with reference to the flowcharts of FIGS.

  In order to maximize the performance of the engine having the variable lift / operating angle mechanism 3, a plurality of valve lift amounts of the variable lift / operating angle variable mechanism 3 can be controlled to be a prescribed value. As described above, it is important to keep the variation in lift amount between cylinders within ± 0.05 mm.

  Therefore, in the present embodiment, the lift / operating angle variable mechanisms 3 for three cylinders are arranged side by side as shown in FIG. If the amount is measured, the lift / operating angle variable mechanism 3 that specifies the minimum lift amount is specified. Based on the minimum lift amount of the specified lift / operating angle variable mechanism 3, the difference between the two lift / operating angle variable mechanisms 3 with respect to the minimum lift amount is obtained respectively. When the control limit (for example, 0.05 mm described above) is exceeded, the lift amount of the corresponding lift / operating angle variable mechanism 3 is adjusted.

  As described above, since the positioning jig 50 in which the lift / operating angle variable mechanism 3 is primarily positioned is waiting in the previous process in the state of FIGS. The jig 50 is gripped and set at a predetermined position on the table 53 in FIG. 10 (step S1 in FIG. 16).

  When the positioning jig 50 is positioned at a predetermined position on the table 53, the lifter 60 performs a lift-up operation, pushes up the positioning jig 50 together with the table 53, and is clamped between the clamp piece 66 (step S2). . In this case, in the clamp configuration using the lifter 60 and the clamp piece 66, as described above, the position and fastening force (pressing force) equivalent to the case where the lift / operating angle variable mechanism 3 is bolted to the cylinder head with the normal torque. ), The normal engine assembly state is reproduced with the clamped state.

  Subsequently, the toggle clamp mechanism 58 standing by on the table 53 is operated to press one side portion of the flange portion 7a at the shaft end of the control shaft 7 as shown in FIG. The stopper surface 99a and the stopper surface 101a on the ladder cam bracket 1b side are brought into pressure contact with each other and the state is maintained. As a result, the control shaft 7 is indexed and positioned at the rotational position that provides the minimum lift amount (step S3).

  Further, the drive shaft drive unit 57 that is also on standby on the table 53 moves forward, and the drive plate 87 at the front end is moved to the flange portion 4a at the shaft end of the drive shaft 4 as shown in FIGS. 8), the lift amount measuring unit 59 is lifted to form a swing cam 5 of the lift / operating angle variable mechanism 3 as shown in FIG. The measuring element 74 is brought into pressure contact with 5a and 5b (step S5). In this case, since the spring force of the preload cylinder 79 corresponding to the spring force of the valve spring (see FIG. 2) in the normal engine assembly state acts on the cam bodies 5a and 5b as described above, This also reproduces the engine assembly state.

  In this state, the drive plate 87 is rotated by the activation of the motor 86 (step S6), and as shown in FIG. 12, the positioning hole 96 and the drive shaft 4 on the drive plate 87 side while the drive plate 87 rotates at least once. Since the dowel pin 4b in the flange portion 4a of the flange portion 4a is engaged with and engaged with each other, the drive shaft 4 is further rotated by a predetermined amount, whereby the cam in the swing cam 5 is driven by the linear gauge 82 shown in FIG. The lift amounts of the main bodies 5a and 5b are individually measured, and the actual measurement data is stored and accumulated in the data storage unit on the control panel 140 side (step S7).

  Thereafter, the rotation of the drive plate 87 in the drive shaft drive unit 57 is stopped (step S8), while the lift amount measuring unit 59 is once lowered (step S9).

  When the lift amount measuring unit 59 descends, the lift amount measuring unit 59 shifts to the left in FIG. 10 by one pitch based on the extension operation of the shift cylinder 68 capable of multi-stage stop, and the next cylinder is lifted and activated. It moves directly below the variable angle mechanism 3. Thereafter, the operations from step S5 to step S9 described above are repeated, and the lift amounts of the cam bodies 5a and 5b in the respective swing cams 5 for the second and third cylinder lift / operating angle variable mechanism 3 are set. taking measurement.

  The lift amount measurement of the cam bodies 5a and 5b in the respective swing cams 5 is thus completed for the lift / operating angle variable mechanism 3 for three cylinders.

  Here, as described above, even if the lift amounts of the pair of cam bodies 5a and 5b forming the swing cam 5 in each lift / operating angle variable mechanism 3 are separately collected, the swing is performed. Since the lift adjusting mechanism attached to the cam 5 is one, that is, the lock bolt 23 and the adjusting bolt 22 for adjusting the lift shown in FIG. 5 are shared by the pair of cam bodies 5a and 5b. The lift amount cannot be adjusted individually for each cam body 5a, 5b.

  Therefore, in the data processing unit of the control panel 140, the average lift amount of the pair of cam bodies 5a and 5b in each lift / working angle variable mechanism 3, that is, the actually measured lift amount data of the two sets of cam bodies 5a and 5b. Are calculated in advance, and these average values are used as lift amount data (for each cylinder) for each lift / operating angle variable mechanism 3. Then, the lift / operation angle variable mechanism 3 corresponding to the minimum lift amount is specified by collating the lift amount data of the lift / operation angle variable mechanism 3 for three cylinders. Based on the minimum lift amount of the specified lift / operating angle variable mechanism 3, the difference between the two lift / operating angle variable mechanisms 3 with respect to the minimum lift amount is obtained respectively. The lift / working angle variable mechanism 3 corresponding to the control limit value (for example, 0.05 mm described above) is specified as “lift amount adjustment required”, and the corresponding lift / working angle is variable. It is assumed that lift amount adjustment work is performed for the mechanism 3.

  Further, for the lift / operating angle variable mechanism 3 specified as “lift amount adjustment required”, the difference from the minimum lift amount described above becomes the lift amount adjustment amount as it is, but is set in advance in the data processing unit. The lift amount adjustment amount is obtained in advance by converting the adjustment angle (rotation operation angle) of the adjustment bolt 22 with reference to a map relating to a certain lift amount adjustment amount-adjust bolt adjustment angle correlation. The adjustment angle data of the adjusting bolt 22 is given as a command to a lift amount adjusting operation unit 67 described later.

  Instead, the lift amount adjusting operation unit 67 starts the shift operation based on the extending operation of the air cylinder 104 capable of multi-stage stop shown in FIGS. 10 and 14, and the lift / operating angle identified as “adjustable lift amount” is specified. It stops just above the mechanism 3 (step S10). In this state, since the drive shaft drive unit 57 is still in the advanced state, the drive shaft 4 is rotated by restarting the motor 86 and the operation of the lock bolt 23 and the like by the lift amount adjusting operation unit 67 is easy. The rotation position is determined (step S11). That is, as shown in FIG. 9, the drive shaft 4 is indexed to the rotational position where the axis of the lock bolt 23 attached to the rocker arm 9 is closest to the vertical state.

  In this state, the socket 34 and the bit 28 on the lift amount adjusting operation unit 67 side shown in FIG. 14 are lowered (step S12), and the bit 28 is passed through the through hole 29 of the lock bolt 23 as shown in FIG. The socket 34 is pressed against the adjustment bolt 22 and the lock bolt 23, respectively. In this case, the bit 28 and the adjusting bolt 22 and the socket 34 and the lock bolt 23 may be correctly fitted to each other. There is no.

  Before and after this, when the nut runner 107 is started, the bit 28 is driven to rotate counterclockwise at a low torque (if both the adjustment bolt 22 and the lock bolt 23 are right-handed, the rotation direction of the bit 28 is the upward movement of the adjustment bolt 22. On the other hand, when the torque increase is detected by the torque management function of the nut runner 107 itself, the rotation of the bit 28 is stopped (step S13). This is nothing but the fact that the bit 28 that will function as a hexagon wrench is correctly fitted into the hexagon hole 26 of the adjustment bolt 22.

  Subsequently, the other nut runner 108 is activated to drive the socket 34 counterclockwise (step S14 in FIG. 17). At this time, if the socket 34 makes at least one rotation, the socket 34 and the head portion 27 of the lock bolt 23 are fitted together, so that the lock bolt 23 is loosened with a larger amount of rotation.

  Thereafter, the nut runner 107 for driving the bit rotation is restarted, and the adjustment bolt 22 is rotated counterclockwise by the adjustment angle corresponding to the previously obtained lift adjustment amount, that is, the adjustment bolt 22 shown in FIG. 5 is raised. The displacement is adjusted to adjust the lift amount in the direction in which the lift amount decreases (step S15). If the adjustment bolt 22 is rotated by a predetermined amount, the nut runner 108 for driving the socket rotation is restarted instead, and the lock bolt 23 is tightened and locked by rotating the socket 34 to the right (step). S16). That is, as shown in FIG. 5, the position of the second connecting pin 13 is finely adjusted in accordance with the displacement of the adjusting bolt 22 that has been previously rotated. Therefore, the second connecting pin is tightened with the lock bolt 23. Lock 13 in that position.

  When the lift amount adjustment operation by the lift amount adjustment operation unit 67 is completed as described above, and the lift amount adjustment operation unit 67 once moves up, and the lift / operation angle variable mechanism 3 needs to be adjusted. The lift amount adjustment operation unit 67 shifts again to the corresponding position and performs the same lift amount adjustment as described above. On the other hand, if no other lift amount adjustment is necessary, the lift amount adjustment operation unit 67 is initially retracted. Return to the position (step S17).

  Thus, when the lift amount adjustment following the lift amount measurement is completed, the operations from the previous step S5 to step S9 are repeated, and after the lift amount measurement is performed again for each lift / operating angle variable mechanism 3, The suitability is determined (steps S18 and S19).

  As a result of the re-measurement of the lift amount, if it is necessary to adjust the lift amount for any one of the lift / operating angle variable mechanisms 3, the previous re-measurement and readjustment steps are repeated.

  Thereafter, the lifter 60 is lifted down and the positioning control until then is performed on condition that the variation in lift amount between the cylinders, that is, between the lift and operating angle variable mechanisms for three cylinders is within the control limit value. The positioning clamp state of the tool 50 is released (step S20), the drive shaft drive unit 57 is further retracted (step S21), and the toggle clamp mechanism 58 is unclamped to change the positioning clamp state of the control shaft 7 up to that time. Release (step S22), a series of lift amount measurement and adjustment work is completed. Finally, a loader (not shown) takes out the positioning jig 50 (step S23).

  Here, the lift amount data before and after adjustment for each cylinder is stored and recorded for quality control, together with the difference from the reference minimum lift amount and the adjustment angle by the adjusting bolt 22 as shown in FIG. In addition, it is assumed to be displayed in real time on the display unit of the control panel 140 as necessary.

As described above, according to the lift amount measuring and adjusting device, the positioning jig 50 is used as a base to reproduce a state equivalent to the actual engine assembly state, and the lift amount of the swing cam 5 is measured as the measurement site. Since measurement and adjustment are performed, not only high-precision lift amount measurement and adjustment can be performed, but also lift amount measurement and adjustment operations that conventionally had to be relied on manually can be realized. It becomes like this.

  In the above example, the lift / operating angle variable mechanism 3 of each cylinder is determined at a position where the lift amount is minimized, and each lift amount is measured, and the smallest one of the three lift amounts is used as a reference. The lift amount is adjusted only for cylinders whose variation exceeds the control limit. However, the lift amounts of the respective lift / operating angle variable mechanisms 3 so that the lift amounts of all the cylinders are within the control limit. May be adjusted individually.

  Here, since the structure of the lift / operating angle variable mechanism 3 is complicated, the assembly is performed manually, and the second connecting pin 13, the adjustment bolt 22, and the lock bolt 23, which are lift amount adjusting parts, are assembled. Since the final confirmation of the assembled state is also made visually, in the unlikely event that assembly abnormalities such as dropout or misalignment of lift amount adjustment parts are missed, the lift amount measurement and adjustment device as described above As mentioned above, there is a possibility of abnormal stoppage due to failure in correct operation.

In the lift / operating angle variable mechanism 3, as shown in FIG. 19, as an abnormal assembly of the second connecting pin 13, the adjustment bolt 22, and the lock bolt 23 constituting the lift amount adjusting mechanism 145 ( When the state of A) is set to the normal state of the lift amount adjusting mechanism 145, the following six patterns shown in circles (1) to (6) in FIGS. is assumed.

・ Adjustment screw 22 (or non-existence) (adjustment 1)
・ Loose adjustment bolt 22 (adjustment screw)
-The lock bolt 23, which is a lock screw, is dropped (or absent) (Abnormal 3)
・ Looseness of lock bolt 23, which is a lock screw (Abnormal 4)
-Drop off of the second connecting pin 13 (Abnormal 5)
・ Rotation deviation of the second connecting pin 13 (Abnormal 6)
Therefore, after the step S4 in the flowchart shown in FIG. 16 and before the step S5, the assembly abnormality detection process as shown in FIG. 20 is executed in advance for the purpose of detecting the six patterns of assembly abnormality. As shown in FIG. 14, a sleeve 141 with a flange portion 141a is provided at the upper end of the bit holder 121 as shown in FIG. Proximity sensors LS1 and LS2 having the flange portion 141a as a proximity body are provided in two upper and lower stages. As described later, whether or not seating torque is generated when the adjustment bolt 22 and the lock bolt 23 of the lift amount adjusting mechanism 145 are temporarily tightened , that is, the magnitude of the seating torque generated when the temporary tightening operation is performed, and the proximity sensor With the height position information of the bit 28 that is an operation jig detected by the LS1 and LS2 , that is, the combination information with the position information of the bit 28 in the axial direction of the bit 28 or the screw 28 in the screwing direction. The six patterns of assembly errors are detected individually.

Here, FIG. 21 is obtained by adding the positional relationship between the bit 28 on the nut runner 107 side and the socket 34 on the nut runner 108 side to each assembly pattern such as the second connecting pin 13 and the adjusting bolt 22 shown in FIG. As is apparent from the figure, in the state where the adjustment bolt 22 and the lock bolt 23 are properly assembled in addition to the second connecting pin 13 which is the main functional component of the lift amount adjustment mechanism 145, the bit 28 is adjusted to the adjustment bolt 22 When correctly fitted in the hexagonal hole 26 of FIG. 21, that is, in the case of (3), (4), (5) in (D) to (F) in addition to the “normal state” in FIG. Each state is detected by the ON operation of the upper proximity sensor LS1 having the flange portion 141a of the sleeve 141 as a proximity body, and the adjustment bolt 22 has fallen off. One case where the bit 28 does not come into contact with anything even in until the lowest position, i.e. the condition in the case of FIG. (B) of the error (1) is detected with ON operation of the lower proximity sensor LS2. In the case of abnormality (2) in FIG. 3C, the proximity sensor LS1 is turned on when the amount of looseness of the adjusting bolt 22 is small, and the proximity sensor LS2 is turned on when the amount of looseness is large. In the case of abnormality (6) in FIG. 5G, both proximity sensors LS1 and LS2 remain off and do not turn on.

  More specifically, as shown in the flowchart of FIG. 20, the lift amount adjusting unit 67 first performs a shift operation and stops immediately above the lift / operation angle mechanism 3 of any cylinder. That is, the lift amount adjusting operation unit 67 starts the shift operation based on the extending operation of the air cylinder 104 capable of multi-stage stop shown in FIGS. 10 and 14, and stops right above any one of the lift / operating angle mechanisms 3. (Step S31). In this state, the drive shaft drive unit 57 is still moved forward (see step S4 in FIG. 16), so that the drive shaft 4 is rotated by restarting the motor 86 and is locked by the lift amount adjusting operation unit 67. The rotation position where the operation of the bolt 23 or the like is easy is determined (step S32). That is, as shown in FIG. 9, the drive shaft 4 is indexed to the rotational position where the axis of the lock bolt 23 attached to the rocker arm 9 is closest to the vertical state.

  In this state, the socket 34 and the bit 28 on the lift amount adjusting operation unit 67 side shown in FIG. 14 are lowered (step S33), and the bit 28 is passed through the through hole 29 of the lock bolt 23 as shown in FIG. The socket 34 is pressed against the adjustment bolt 22 and the lock bolt 23, respectively. At the time of this pressing, the bit 28 and the adjusting bolt 22 and the socket 34 and the locking bolt 23 may be correctly fitted, but at this point, it is not always necessary to be fitted only by being pressed against each other. . In addition, the movement regarding steps S31 to S33 so far is basically the same as that in steps S10 to S12 of FIG.

In this state, the socket 34 is driven to rotate clockwise with a temporary tightening torque set in advance by starting the nut runner 108 (if both the adjustment bolt 22 and the lock bolt 23 are right-handed, the rotation direction of the socket 34 is the lock bolt. 23 is tightened with respect to the second connecting pin 13), and the lock bolt 23 is temporarily tightened (step S34). This means that after the socket 34 is correctly fitted to the head of the lock bolt 23, the socket 34 is rotated until the tip of the lock bolt 23 is seated on the second connecting pin 13. Then, the torque management function of the nut runner 108 itself determines whether or not seating torque is generated in step S35 , that is , whether or not the magnitude of the seating torque is appropriate , and the torque generated when the lock bolt 23 is temporarily tightened is preset. If the seating torque is reached, the process proceeds to the next step S36, and if the seating torque corresponding to the set torque is not generated, the abnormality shown in FIG. It is determined as “dropping of the lock bolt 23” in (3).

FIG. 22 is a graph in which the presence or absence of the above-described seating torque is added to FIG. 21. As is apparent from FIG. 21, the provisional tightening of the lock bolt 23 in step S34 and the subsequent occurrence of seating torque in step S35. The determination is made for the purpose of determining the presence or absence of “lock bolt dropout” of abnormality (3) shown in FIG. 22D. Even when the lock bolt 23 is tightened with the socket 34, the generation of seating torque is recognized. If not, it is determined that the lock bolt 23 has fallen off, and immediately, as in step S37, the abnormality (3) “lock bolt 23 dropout” shown in FIG. Then, an alarm or the like identifies the assembling abnormality of the lift amount adjusting mechanism as “dropping of the lock bolt 23” and notifies the operator.

  On the other hand, if generation of seating torque is recognized in step S35, in addition to the “normal state” in FIG. 22A, the “loose lock bolt 23” in the abnormality (4) in FIG. There is a possibility that has occurred. However, if at least the head 27 of the lock bolt 23 and the socket 34 are fitted and the temporary tightening operation proceeds, the "loosening of the lock bolt 23" is eliminated, and the "normal state" in FIG. It becomes the same state.

In the next step S38, the bit 28 is driven to rotate counterclockwise with a temporary tightening torque preset by starting the other nut runner 107 (if both the adjusting bolt 22 and the lock bolt 23 are right-handed, the bit 28 The rotation direction is the direction in which the adjustment bolt 22 is tightened with respect to the second connecting pin 13), and the adjustment bolt 22 is temporarily tightened. This means that after the bit 28 is correctly fitted into the hexagon hole 26 of the adjusting bolt 22, the bit 28 is rotated until the tip of the adjusting bolt 22 is seated on the second connecting pin 13. Then, the torque management function of the nut runner 107 itself determines whether or not seating torque is generated in step S39 , that is , whether or not the magnitude of the seating torque is appropriate , and the torque generated when the adjustment bolt 23 is temporarily tightened is preset. If the seating torque is reached, the process proceeds to the next step S40. If no seating torque corresponding to the set torque is generated, the abnormality (1) "adjustment" shown in FIG. Determination is made as “dropping of the bolt 22” or “rotational deviation of the second connecting pin 13” of abnormality (6) shown in FIG.

  FIG. 23 shows the presence or absence of occurrence of the seating torque described above in FIG. 22. In addition to the abnormality (3) “dropping of the lock bolt 23” that has already been identified as an assembly abnormality, The “loosening of the lock bolt 23” that has already been returned to the “normal state” while being determined as 4) is not shown.

  The temporary tightening of the adjusting bolt 22 in step S38 and the subsequent presence / absence determination of the seating torque generation in step S39 are performed according to the abnormality (1) “dropping of adjusting bolt 22” shown in FIG. The purpose of this is to determine whether or not the abnormality (6) “rotational deviation of the second connecting pin 13” shown in FIG. 2) has occurred. Even if the adjustment bolt 22 is tightened with the bit 28, no seating torque is generated. In this case, there is nothing other than “omission of the adjusting bolt 22” or “rotational deviation of the second connecting pin 13”, and immediately after the abnormality (1) “adjustment” shown in FIG. It is determined that the bolt has fallen off or the abnormality (6) shown in FIG.

  On the other hand, when generation of seating torque is recognized in step S39, in addition to the case of “normal state” in FIG. 23A, “adjust bolt” of abnormality (2) shown in FIG. There is a possibility that "22 loosening" has occurred. However, if at least the hexagonal hole 26 of the adjusting bolt 22 and the bit 28 are fitted and the temporary tightening operation proceeds, the "loosening of the adjusting bolt 22" is eliminated and is the same as the "normal state" in FIG. It becomes a state.

  If it is determined in step S41 that an abnormality (1) “adjustment bolt 22 has dropped” or an abnormality (6) “rotation deviation of second connecting pin 13” has occurred, the next step S42 in FIG. It is determined whether or not the lower proximity sensor LS2 is ON.

  Note that FIG. 24 is obtained by adding the operating state of the proximity sensor LS2 to FIG. 23. In addition to the abnormality (3) “dropping of the lock bolt 23” that has already been identified as an assembly abnormality, an abnormality ( 4) “Loose bolt 23” that has already returned to the “normal state” while being determined as 4), and “Adjust bolt” that has already been returned to the “normal state” even though it has been determined to be abnormal (2) “Looseness 22” is not shown.

That is, as apparent from FIG. 24B, if the adjustment bolt 22 has been dropped from the beginning, the lower proximity sensor LS2 is turned on, so that in step S43, the abnormality (1) “adjustment” If the lower proximity sensor LS2 is OFF, it is determined in step S44 that the rotation of the second connecting pin 13 is abnormal (6). Then, in any case of abnormality in assembly, after identifying the assembly abnormality of the lift amount adjustment mechanism as “dropping of the adjusting bolt 22” or “rotational deviation of the second connecting pin 13” with an alarm or the like. Notify the operator.

  In this way, by using the ON-OFF operation state of the lower proximity sensor LS2 for the determination of the assembly abnormality, the abnormality (1) “dropping of the adjusting bolt 22” and the abnormality (6) “second connection” The “rotational deviation of the pin 13” is specified, and the assembling abnormality not specified as shown in FIG. 25 is only the abnormality (5) “dropping of the second connecting pin 13”.

If it is determined in step S40 that the abnormality (2) “loosening of the adjustment bolt 22” has been resolved and it is determined to be substantially normal, is the upper proximity sensor LS1 in FIG. 25 turned on in the next step S45? Judge whether or not. That is, as is apparent from FIG. 25F, if the second connecting pin 13 is dropped from the beginning, the upper proximity sensor LS1 is turned off. If it is determined that “the second connecting pin 13 has been dropped”, and the upper proximity sensor LS1 is turned ON, it is determined in step S47 that the “normal state” shown in FIG. If it is determined that the abnormality (5) is “dropping of the second connecting pin 13”, an alarm or the like is used to identify the assembly abnormality of the lift amount adjusting mechanism as “dropping of the connecting pin 13”. Notice.

  As described above, whether or not seating torque is generated when the adjustment bolt 22 and the lock bolt 23 are temporarily tightened, and the height position information of the bit 28 which is an operation jig detected by the proximity sensors LS1 and LS2. It is possible to detect the above-mentioned 6 patterns of assembly abnormalities individually with the combination information.

Thereafter, the lift / operating angle mechanism 3 of the remaining two cylinders is similarly subjected to the processes of steps S34 to S46 to determine whether or not there is an abnormal assembly of the lift amount adjusting mechanism . If even one assembly abnormality is detected, the subsequent lift amount measurement and adjustment operations are stopped, and the operator is urged to check the lift / operating angle mechanism 3 of each cylinder, while the assembly abnormality is completely detected. For the first time on the condition that it is not performed, the process proceeds to the measurement of the lift amount after step S5 in FIG.

Plane explanatory drawing of the cylinder head provided with the lift and the working angle variable mechanism as a variable valve mechanism. Cross-sectional explanatory drawing which follows the AA line of FIG. The principal part expansion explanatory drawing of FIG. FIG. 4 is a perspective view of the lift / operating angle variable mechanism of FIG. The principal part disassembled perspective view of FIG. The top view of the rocker arm shown in FIG. Sectional drawing in the coupling | bonding state of the rocker arm shown in FIG. 5, and a 2nd link. The top view which shows the state which positioned the lift and the working angle variable mechanism in the positioning jig of the shape imitating a cylinder head. Cross-sectional explanatory drawing which follows the CC line of FIG. The schematic explanatory drawing of the apparatus for lift amount measurement and adjustment. The principal part sectional drawing of the lift amount measurement unit in FIG. FIG. 11 is a cross-sectional view of a main part of the drive shaft drive unit shown in FIG. 10. Functional explanatory drawing of the positioning jig shown in FIG. FIG. 11 is a cross-sectional view of a main part of the lift amount adjusting operation unit shown in FIG. 10. The bottom view of FIG. 11 is a flowchart showing the operation of the apparatus of FIG. 11 is a flowchart showing the operation of the apparatus of FIG. Explanatory drawing which shows the example of a display of lift amount adjustment result. Explanatory drawing which shows the pattern of the assembly | attachment state of a lift amount adjustment mechanism . The flowchart which shows the detection procedure of the assembly | attachment abnormality shown to (B)-(G) of FIG. FIG. 20 is an explanatory diagram in which a lock bolt operation socket and an adjustment bolt operation bit are added to the assembly state pattern of the lift amount adjustment mechanism of FIG. 19. FIG. 22 is an explanatory diagram showing a state in which the lock bolts are temporarily tightened from the state of FIG. 21 and the process proceeds to whether or not “lock bolt dropout” and “lock bolt loosening” are abnormal. FIG. 22 illustrates a state in which the adjustment bolt has been temporarily tightened from the state of FIG. 22 and has proceeded to the presence / absence determination of “adjustment bolt dropout”, “adjustment bolt loosening”, and “connection pin rotation deviation” that are abnormal in assembly. Figure. Explanatory drawing which added the ON-OFF state of the proximity sensor to FIG. FIG. 25 is an explanatory diagram illustrating a state in which it has proceeded from the state of FIG. 24 to the presence / absence determination of “rotation deviation of the connecting pin” that is an assembly error.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylinder head 1a ... Head lower 1b ... Ladder cam bracket (head upper)
2 ... Intake valve 3 ... Lift / operating angle variable mechanism (variable valve mechanism)
4 ... Drive shaft 5 ... Oscillating cam 5a, 5b ... Cam body 6 ... Eccentric cam (drive cam)
7 ... Control shaft 8 ... Eccentric cam 9 ... Rocker arm 10 ... First link (first link member)
11 ... 2nd link (2nd link member)
13 ... bit 30 ... flat plate-portion of the lock bolt 28 ... work tool as adjustment bolts 23 ... lock screw as a second coupling pin 22 ... adjustment screw (seating surface)
34 ... Socket 67 ... Lift amount adjustment operation unit (lift amount adjustment operation means)
107 ... nut runner (adjustment screw operation means)
108 ... Nutrunner (lock screw operating means)
140 ... Control panel (determination means)
145 ... Lift amount adjusting mechanism LS1 ... Proximity sensor (detection means)
LS2: Proximity sensor (detection means)

Claims (13)

Lift amount adjusting mechanism attached to a valve operating mechanism in which a drive shaft that rotates in conjunction with a crankshaft and a swing cam that lifts an intake or exhaust valve of an engine are linked by a plurality of links. In
In the lift amount adjusting mechanism, a connecting pin that connects at least two links so as to be relatively rotatable with each other is pressure- fixed with a lock screw and an adjusting screw , and the lock screw is temporarily adjusted when the lift amount is adjusted. After loosening and adjusting the position of the connecting pin by rotating the adjusting screw, the lock screw is tightened again and the connecting pin is pressed and fixed .
An apparatus for detecting assembly abnormality of the lift amount adjusting mechanism,
A lock screw operating means for rotating the lock screw;
An adjustment screw operating means having an operation jig fitted to the adjustment screw and rotating the adjustment screw with the operation jig;
The size of the seating torque generated when the temporary tightening operate the lock screw by locking screw operation means, the size of the seating torque generated when the temporary clamping operation the adjustment screw by adjustment screw operating means, and temporarily tighten the adjustment screw A determination means for determining presence / absence of an assembly abnormality of the connection pin, the lock screw, and the adjustment screw based on the combination information with the position information of the operation jig in the screwing direction of the adjustment screw after the operation;
An assembly abnormality detecting device for a lift amount adjusting mechanism in a valve operating mechanism. The lock screw and the adjustment screw in the lift amount adjusting mechanism are both arranged on the same axis, and both the lock screw and the adjustment screw can be operated from the same direction. assembling the abnormality detecting device of the lift amount regulating mechanism in the valve train. Characterized in that it has a detection means for detecting the position of the work tool of the adjustment screw in the screwed direction of the adjusting screw when with a work tool in order to operate temporarily tightened to rotating the adjustment screw The assembly abnormality detection apparatus of the lift amount adjustment mechanism in the valve operating mechanism according to claim 1 or 2. The valve mechanism is
A drive shaft that rotates in conjunction with the crankshaft and includes a drive cam; a swing cam that is swingably supported by the drive shaft and lifts an intake or exhaust valve of the engine; and a drive shaft; A parallel control shaft and a swing shaft provided on the control shaft, one end connected to the drive cam via the first link member and the other end connected to the swing cam via the second link member A variable valve type that has a rocker arm and controls the rotational position of the control shaft in accordance with the engine operating state, thereby changing the rocking fulcrum of the rocker arm to variably control the valve lift. Because
4. The assembly abnormality detecting device for a lift amount adjusting mechanism in a valve operating mechanism according to claim 1, further comprising a lift amount adjusting mechanism at a connecting portion between the rocker arm and the second link member. . Connecting pin constituting the lift amount adjusting mechanism, the rocker arm and the set of lift adjusting mechanism in a valve operating mechanism according to claim 4, characterized in that, which connects the second link member Anomaly detection device. Lift amount adjusting mechanism attached to a valve operating mechanism in which a drive shaft that rotates in conjunction with a crankshaft and a swing cam that lifts an intake or exhaust valve of an engine are linked by a plurality of links. In
In the lift amount adjusting mechanism, a connecting pin that connects at least two links so as to be relatively rotatable with each other is pressure- fixed with a lock screw and an adjusting screw , and the lock screw is temporarily adjusted when the lift amount is adjusted. After loosening and adjusting the position of the connecting pin by rotating the adjusting screw, the lock screw is tightened again and the connecting pin is pressed and fixed .
A method for detecting an assembled abnormality of the lift amount adjusting mechanism,
The size of the seating torque generated lock screw when temporary tightening operation, the size of the seating torque generating adjustment screw with a work tool fitted to the adjusting screw when the temporary tightening operation, and temporary tightening operation of the adjusting screw And determining whether or not the connecting pin, the lock screw and the adjusting screw are assembled abnormally based on combination information with positional information of the operating jig in the screwing direction of the adjusting screw later. An assembly abnormality detection method of the lift amount adjustment mechanism in the mechanism . While the connecting pin constituting the lift amount adjusting mechanism has a seating surface on which each of the screws is seated in a state of facing the lock screw and the adjusting screw,
When the adjustment screw is temporarily tightened, the detection means detects whether the operation jig is positioned at the normal position when the temporary tightening operation is completed as a first step, and the temporary tightening operation is completed. When the operating jig is not positioned at the normal position at the time, as a second step, whether or not the operating jig is positioned at a position corresponding to the maximum loosening position of the adjusting screw is turned ON / OFF by the detecting means The method of detecting an assembly abnormality of the lift adjustment mechanism in the valve mechanism according to claim 6, wherein the abnormality is detected. The valve mechanism is
A drive shaft that rotates in conjunction with the crankshaft and includes a drive cam; a swing cam that is swingably supported by the drive shaft and lifts an intake or exhaust valve of the engine; and a drive shaft; A parallel control shaft and a swing shaft provided on the control shaft, one end connected to the drive cam via the first link member and the other end connected to the swing cam via the second link member A variable valve type that has a rocker arm and controls the rotational position of the control shaft in accordance with the engine operating state, and thereby variably controls the valve lift by changing the rocking fulcrum of the rocker arm. Because
8. The method for detecting an abnormality in assembly of a lift amount adjusting mechanism in a valve operating mechanism according to claim 7, further comprising a lift amount adjusting mechanism at a connecting portion between the rocker arm and the second link member. Connecting pin constituting the lift amount adjusting mechanism, the rocker arm and the set of lift adjusting mechanism in a valve operating mechanism according to claim 8, characterized in that, which connects the second link member Anomaly detection method. It performs magnitude appropriateness determination of the seating torque generated when the lock screw is rotated operated to the locking screw operated temporarily tightened, the absence of at least locking screw with a determination result made "irrelevant" size of the seating torque abnormality detection nuance method assembling of the lift amount adjusting mechanism in a valve operating mechanism according to any of claims 7-9, characterized in that identifying the assembly abnormalities. Judgment of suitability of the magnitude of the seating torque generated when the adjustment screw is rotated to temporarily tighten the adjustment screw when the result of the judgment of the seating torque during the temporary tightening operation of the lock screw is “appropriate” It was carried out, according to claim 10, characterized in that specified as being any of a positional deviation of the absence and the connecting pin of the magnitude of the seating torque becomes "irrelevant" determination result with a assembling abnormality adjusting screw abnormality detection nuance method assembling of the lift amount adjusting mechanism in a valve operating mechanism according to. ON / OFF whether or not the operating jig is positioned at the position corresponding to the maximum loosening position of the adjusting screw when the judgment result of the magnitude of the seating torque during the temporary tightening operation of the adjusting screw is “unsuitable” An assembly abnormality determination is performed on the basis of the output of the detecting means that detects automatically , and it is selectively specified whether the assembly abnormality is the absence of the adjusting screw or the displacement of the connecting pin. abnormality detection nuance method assembling of the lift amount adjusting mechanism in a valve operating mechanism according to claim 11. If the result of determining the seating torque during the temporary tightening operation of the adjustment screw is “appropriate”, whether or not the operation jig is positioned at the normal position when the temporary tightening operation is completed is turned ON / OFF. Assembled abnormality is determined based on the output of the detecting means to be detected , and it is selectively specified whether each of the connecting pin, lock screw and adjusting screw is normal or whether the assembling abnormality is the absence of the connecting pin. abnormality detection nuance method assembling of the lift amount adjusting mechanism in a valve operating mechanism according to claim 12, characterized in that the.

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