JP3455435B2 - Valve cotter assembly inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a valve stem and a valve stem.
Bar that connects between the retainer that locks the lube spring
A valve for inspecting the lube cotter for improper assembly or missing
The present invention relates to a bucotta inspection device. [0002] 2. Description of the Related Art Generally, in a 4-cycle engine, FIG.
As shown in FIG.
1a and the exhaust port 1b, and the intake valve 2 and the exhaust valve.
And valves 3 and 2, respectively.
The valve stem end 4a of the valve stem 4 provided in
By pressing with a cam (not shown), each port 1a,
1b is opened at a predetermined timing. [0003] Each of the valve stem ends 4a has a valve.
The bush spring retainer 5 is locked via the valve cotter 6.
To the valve spring retainer 5 and cylinder.
Each valve spring 7 is interposed between the
The valves 2 and 3 are constantly urged in the valve closing direction. The valve cotter 6 is divided into a plurality of pieces.
Valve spring refill in the assembly line.
The tener 5 is assembled to the valve stem 4 and pushed down slightly
After the valve cotter 6 has been
It is assembled to the installation. [0005] The valve cotter is properly assembled
Various devices have been proposed for checking whether or not the condition is satisfied.
You. [0006] A contact is brought into contact with the valve cotter to
When detecting assembly errors such as missing or floating lub cotters
If the number of detection rods is one or two, one detection rod
Is abutted across multiple pieces, so one piece
Even if it is missing, the detection rod is
Detect missing piece as long as it is in contact with the piece
Can not do. For this reason, for example, Japanese Utility Model Laid-Open No. 3-79228
In the publication, each piece of valve cotter divided into a plurality
Are arranged in accordance with the conditions, and whether or not each of these
Is detected by the contactor displacement sensor, and the rod connected to the contactor
The rod displacement sensor detects whether or not
When both sensors are off, the sensor corresponding to the
Is determined to be missing, and the contact point
When the sensor is ON and the rod displacement sensor is OFF,
Is judged to be correctly assembled, and
When both are ON, the piece is in the valve stem end direction
There is disclosed a technique for determining that the surface is floating. Further, Japanese Patent Application Laid-Open No. 63-123640 discloses
Is to rotate one contact on the tip by 120 °
To detect missing or floating valve cotters at three locations.
Techniques are disclosed. Further, Japanese Utility Model Laid-Open No. 4-19727 discloses that
Phase between valve stem end and valve spring retainer
The relative position is detected, and the valve cotter is
A technique for checking whether or not the battery is correctly loaded has been disclosed.
I have. [0010] Problems to be Solved by the Invention
In the technology disclosed in Japanese Patent Publication No.
Combination of ON / OFF of this photoelectric sensor using sensor
Only inspects the valve cotter for a defective assembly.
Therefore, the relative position of the valve cotter can be accurately detected.
No, for example, if the valve cotter is completely floating
If it is locked halfway, a defective assembly is detected.
May not be possible, and there is a problem with the detection accuracy.
You. Further, Japanese Patent Application Laid-Open No. 63-123640 discloses
In the technique shown, one stylus is turned by 1/3 turn
Inspection cycle is extended, so inspection cycle is longer
And the inspection efficiency is poor. [0012] Japanese Unexamined Utility Model Publication No. Hei 4-19727 discloses the technique.
Technology does not directly detect valve cotters
Therefore, there is a problem that the accuracy of the inspection result is lacking. Further, Japanese Utility Model Laid-Open No. 3-79228,
In JP-A-63-123640, it is set in advance.
The inspection is based on the absolute position of the valve cotter,
The position of the valve cotter is determined by the valve head of each valve.
Is determined by the position when seated in the
Processing errors on the board surface, errors on the assembled parts, etc.
Since the position of the lub cotter varies, the measurement error
Easy to occur. The present invention has been made in view of the above circumstances,
Inspection corresponding to various types is possible, and valve cotter is complete
Can detect a semi-assembled state that is not floating on the
Highly accurate detection of defective or missing bucotta
To provide a valve cotter assembly inspection system that can
The purpose is. [0015] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The present invention relates to a valve stem protruding from a cylinder head.
To the valve spring retainer via the valve cotter.
When hangingThe height of the valve stem end
Valve stem detection rod that abuts the valve stem end
Measurement based on signals from non-contact sensors via
At the same time, check the height of the valve cotter
Via a valve cotter detection rod placed around the knowledge rod
Measurement based on the signal from the non-contact sensor.
Valve lock to valve stem end based on measured value
The amount of displacement of the data is calculated, and the amount of displacement
Equipped with an arithmetic processing unit to detect the assembly status of the valve cotter
A valve cotter assembly inspection apparatus,
Supports the stem detection rod and the valve cotter detection rod
Each of the judgment rods is connected via a holding arm,
Arrange the judgment rods in a row, and
The non-contact type cell movable along the row of judgment rods
SensorIt is characterized by the following. [0016] [0017] [0018] [0019] [0020] [0021] [0022] [0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
Next, an embodiment of the present invention will be described. Engine
The head 1 has an assembly line along a conveyor 12.
It is placed on the work pallet 13 to be transferred,
Cylinder head 1 serves as an assembly line assembly station
While passing, the intake valve 2, exhaust valve 3, etc.
Assembled. Note that the cylinder head 1 is
Position with a knock pin (not shown) protruding from
It has been decided. At the time of assembling, each of the valves 2 and 3 is provided.
The valve stem end 4a of the valve stem 4
Inserted into the head 1 from the combustion chamber side and protrudes from the upper surface
Insert the valve spring 7 loosely into the valve stem 4 and then
To the valve stem 4 from the valve stem end 4a side.
Insert the lube spring retainer 5 into the cylinder head 1
Press down in the direction. Then, around the valve stem end 4a
In addition, a bag divided into a plurality (two pieces in this embodiment)
Hook the lub cotter 6 and remove the valve spring retainer 5
Using the urging force of the valve spring 7, the valve stem
And return to the direction of the
Lube spring retainer 5 on valve stem end 4a
Fix it. The cylinder head 1 shown in the present embodiment
Is a four-cylinder 16-valve engine with two cylinders arranged in one bank.
One cylinder head 1
The intake valve 2 and the exhaust valve 3 are arranged in two rows of four each.
Have been. The cylinder head thus assembled is
Is transported by the conveyor 12 of the assembly line.
The inspection station is sent to this assembly line.
21 is provided. In the inspection station 21,
Inspect the valve cotter 6 for improper assembly and for missing parts
I do. On the frame 22 of the inspection station 21
A column 23 is erected, and one side of the column 23
A conveyor 12 is laid. In addition, this conveyor 1
2 is a hood for supporting and moving both sides of the work pallet 13.
Eel conveyor and the like. A lifter 24 is provided below the conveyor 12.
Are arranged. Base plate 2 of this lifter 24
6 is mounted and fixed on the frame 22 via the spacer 25.
The lifter cylinder 2 is mounted on the base plate 26.
7 is suspended. This lifter cylinder 27 is a lifter
The lifter plate 2 is connected to the plate 28.
8 to guide rods 29 provided on both sides thereof.
Raise and lower while holding it. The lifter plate 28
Is a reference pin for engaging and positioning the work pallet 13.
28a is erected. Further, at the leading end of the lifter plate 28,
A stopper cylinder 30 is vertically provided.
Work pallet stopper 30a is connected to cylinder 30
Have been. When the stopper cylinder 30 protrudes, the work
Let stopper 30a is on the track of work pallet 13.
When the stopper cylinder 30 is retracted.
The pallet stopper 30a is retracted from the track. Wa
Work pallet stopper 30a
When faced on Michigami, the tip surface of work pallet 13
It comes into contact with the work pallet stopper 30a and is stopped. Reference numeral 32 denotes a serial number on the work pallet 13.
For detecting whether or not the head 1 is mounted
The detection switch 33 is a work
Pass confirmation to detect whether or not the let 13 has been transferred
Switch. The upper side of the column 23 has a base plate
The base plate 23a is fixedly mounted.
a, the bolster 34 extends above the conveyor 12
Have been. The bolster 34 is formed in a V shape.
The angle between the two side surfaces 34a is
Formed at the same angle as the assembled valve stem 4
The lower end surface where the both side surfaces 34a converge is
Positioning stopper that regulates the rising position of the Linda head 1
35 is provided vertically. The bolster 34 has a substantially middle portion on both side surfaces 34a.
In the center, a detection unit feed cylinder 36 is fixedly mounted.
A pair of guide rails 37 are provided on both sides. this
The guide rail 37 has a detection unit feed
A slider 38 having a notch for escaping the cylinder 36
The slider 38 is supported by the detection unit
It is connected to the rod of the cylinder 36. The slider 38 has an intake side and an exhaust side.
Detection unit 39 corresponding to each of the four valves
They are fixed individually. The body of each detection unit 39
Lower bracket 40a and upper bracket
The lower bracket 40a is fixed to the lower bracket 40a.
A guide sleeve 41 is provided vertically. The guide sleeve 41 is provided with a valve stem.
The distal end of the detection rod 42 is inserted and supported
And the valve cotter detection
The pads 43 are respectively inserted and supported so as to be able to advance and retreat. After the valve stem detecting rod 42,
The end is an upper bracket 40 provided on the body frame 40.
b is inserted and supported through the guide bush 44 so as to be able to advance and retreat.
Adjustment at the rear end of the valve stem detection rod 42.
A star 45 is screwed. Also, at the rear end of the valve cotter detecting rod 43,
A flange portion 43a is formed.
A push rod 46 is provided continuously. The upper part of the valve stem detection rod 42, and
At the upper end of the push rod 46, a support extending in the orthogonal direction
The base of the arm 47 is fixed. Each of these support arms
47 is in the direction opposite to the slider 38 without buffering each other.
The first to fourth determination rods 48a
To 48d are gripped. Each of these determination rods 48a-
48d is a row of judgment rods arranged in a horizontal line, and
Is inserted into the ball bush 49 so that it can move forward and backward.
Is held. On the other hand, the valve stem detecting rod 42 is
Always biased toward the tip by the return spring 50
The amount of protrusion is adjusted by the adjuster 45.
You. Further, the guide sleeve 41
Push rod 46 is hooked on its tip
Interposed between the retainer 53 and the guide sleeve 41
The valve spring is biased by the return spring 52
The cutter detection rod 43 is constantly biased in the distal direction,
The valve cotter detection rod 43 is formed at the rear end.
Flange portion 43a is formed in the middle of the guide sleeve 41.
The projection is restricted by being hooked on the receiving surface 41a thus formed.
The tip of each valve cotter detection rod 43 is flush with the same surface.
It is set to be. As shown in FIG. 8, the valve cotter detection lock
Since the nodes 43 are arranged in three equal parts,
2 valve cotter detection rods 4 for lub cotter 6
3 can be in contact with each other.
You. On the other hand, the protrusion of the valve stem detecting rod 42
The amount depends on the valve stem end 4a of the model to be inspected.
Step h in design with the upper surface of valve cotter 6 (see FIG. 7)
The protrusion amount of the valve cotter detection rod 43
It is set based on the tip end surface of
At this time, the heads of the determination rods 48a to 48d are the same.
It is set to be one side. Incidentally, the projecting rods of the determination rods 48a to 48d
The output amount is determined for each of the determination rods 48a to 48a to the support arm 47.
It can be adjusted by changing the holding position of 48d. Also, the bolus of the base plate 23a
Extend along this bolster 34 on both sides sandwiching the
A channel base 54 that protrudes is provided.
Connected to the sensor motor 55 on the upper surface of the channel base 54
The slide unit 56 is fixedly mounted. In addition,
On the side of the channel base 54, the linear guide 57 is
The judgment rods 48a to 48d are arranged in parallel with the heads.
The linear guide 57 has an example of a non-contact type sensor.
Is movably supported.
This laser sensor 58 is connected to the slide unit 56.
It is reciprocated by the sensor motor 55. A table 6 is provided above the bolster 34.
0 is fixed, and the first monitor 61 a
Display unit 6 including two monitors, a second monitor 61b
1 is mounted and fixed. As shown in FIG. 9, the laser sensor 58
Is a laser diode 58a and this laser diode
For receiving the reflected light of the laser light emitted from
And a photodiode 58b. The light received by the photodiode 58b is
The converted signal is used as the height calculating means of the arithmetic processing unit 62.
63 is output. The arithmetic processing unit 62 includes a valve
As a function of performing an assembly inspection of the cotter 6, a height calculating unit is provided.
63, displacement amount calculating means 64, determining means 65, monitor switch
Switch 66 is provided, and the determination
The result is output to a lamp train 61c provided on the first monitor 61a.
When the monitor switch 66 is turned ON, the displacement amount is calculated.
The height of the first determination rod 48a obtained by the means 64 is set to 0.
The second and third determination rods 48b at the reference height
Is displayed on the second monitor 61b.
It is displayed numerically by the computer controller. The lamp row 61c includes at least a bulb.
The number of lamps is the same as the number of lamps.
If a defective assembly of the valve cotter 6 is detected
Lights up the corresponding lamp to indicate the assembly failure.
You. Next, the operation of the present embodiment having the above configuration will be described.
Will be described. Moved by the conveyor 12
Knocked on the work pallet 13
The cylinder head 1 positioned by the pin is
When passing through the vertical line, the cylinder head 1
And the valve stem 4 of the intake valve 2, the exhaust valve 3,
Predetermined parts that make up the valve train, such as the lube spring 7
To the next inspection station after assembly is completed.
Sent. At the inspection station 21, the passage confirmation switch
Work pallet 13 is inspected by switch 33
21 and the work detection
Cylinder head on work pallet 13 by switch 32
When it is detected that
Linda 30 raises work pallet stopper 30a.
The work pallet stopper 30a
On the orbit of G13. Have been transported by the conveyor 12
Work pallet 13 becomes work pallet stopper 30a
When the movement is stopped by being hung, the lifter cylinder 27 operates.
Operation, and lifter plates 28 are disposed on both sides thereof.
While being supported by the guide rod 29
You. Then, it is protruded from the lifter plate 28
The reference pin 28a is engaged with the work pallet 13,
This work pallet 13 is positioned and then lifter
Place the work pallet 13 on the plate 28 and raise it.
Let Above the lifter plate 28, a V-shape
The formed bolster 34 is opposed to the bolster 34
A positioning stopper 35 is suspended from the table 34. The series mounted on the work pallet 13
When the nozzle head 1 is engaged with the positioning stopper 35,
The operation of the lifter cylinder 27 is stopped, and the cylinder head
1 is stopped at a preset inspection position. The figure
As shown in FIG.
3, the intake valve 2 and the exhaust valve 3 are moved in the transfer direction.
Are placed in a state of being arranged in a direction perpendicular to the direction. Next, the column 23 extends laterally from the upper portion.
V-shaped side surfaces 3 of the bolster 34
The detection unit feed cylinder 36 fixed to 4a is
The slider 38 is protruded to support the slider 38 on the guide rail 37.
And move it down. Then, this slider 38
The tip of each detection unit 39 fixed to the
Intake valve 2 projecting from the upper surface of
From the axial direction to the valve stem end 4a of the air valve 3
Bars that are close to and protrude from the tip of each detection unit 39
The tip of the lube stem detection rod 42 is
Abut on the door 4a. Then, the valve stem detection rod 42
However, according to the protruding operation of the detection unit feed cylinder 36,
Retreats relatively against the urging force of the return spring 50
At least when it moves by a tolerance δ described later.
The projecting operation of the sensing unit feed cylinder 36 stops. At this time, around the valve stem end 4a
To prevent the valve spring retainer 5 from coming off
If the cotter 6 is properly installed, check the valve stem.
Detection of the valve cotter arranged around the knowledge rod 42
The tip of the rod 43 contacts the top surface of the valve cotter 6,
In accordance with the projecting operation of the intelligent unit feed cylinder 36,
The valve stem against the urging force of the spring 52
It relatively retreats by the same amount of movement as the detection rod 42. Further, at least one valve cotter 6 is provided.
The valve stem end 4a is
If it floats in the direction
The movement amount of the rub cotter detection rod 43 increases. vice versa,
If at least one of the valve cotters 6 is missing,
Valve cotter detection rod facing this missing position
The tip of 43 will remain in a protruding state.
You. The valve stem detecting rod 42 is supported
Connected to the first determination rod 48a via the arm 47
And presses the three valve cotter detection rods 43.
Each push rod 46 is connected to a second
To the third determination rods 48b to 48d. Projection of the detection unit feed cylinder 36
When the operation stops, the sensor motor 55 starts, and the
The laser sensor 58 via the guide unit 56
Along the guide 57, the suction
Move the air valve 2 and the exhaust valve 3 in the arrangement direction.
You. The laser sensor 58 is used as the linear guide 57
A total of 4 sets are provided, with 4 sets of 1 valve on each side.
When moving on the obtained judgment rods 48a to 48d
The laser diode 58a provided in the laser sensor 58
The laser light emitted from each of the determination rods 48a to 48d
And the reflected light is applied to the photodiode 58b.
To receive light. In the photodiode 58b, the received light
Calculating means provided in the arithmetic processing unit 62 by photoelectrically converting the
63. In the height calculating means 63, when the laser beam is reflected
The height of each judgment rod 48a to 48d (actually
From the sensor 58 to the heads of the determination rods 48a to 48d.
Is calculated for each valve. Next, the displacement amount calculating means 64 controls each valve.
Each time, based on the reflected light from the head of the first determination rod 48a,
The second to fourth heights are defined as the zero reference height based on the calculated height.
Based on the reflected light from the heads of the judgment rods 48b to 48d
The displacement amounts OUT1 to OUT3 with respect to the height calculated by
Calculated based on OUT1 = h2-h1 OUT2 = h3-h1 OUT3 = h4-h1 Here, h1 to h4 are the values of the respective determination rods 48a to 48d.
Indicates the height. Then, in the determination means 65, the displacement amount
The displacement amounts OUT1 to OUT3 calculated by the calculating means 64 and the tolerance
δ and each displacement amount OUT1 to OUT3 becomes the tolerance δ.
It is checked whether or not all the displacement amounts OUT1-O
If UT3 is within the tolerance δ, it is determined to be appropriate (OK) and
Even one of the positions OUT1 to OUT3 is out of the tolerance δ.
Is determined to be defective (NG) when the valve cotter 6 is installed.
I do. Note that the tolerance δ is the variation in the cylinder head 1 and the
Manufacturing error of the parts constituting the inspection station 21 and the set
Consider the dispersion at the time of attachment, the measurement error of the laser sensor 58, etc.
, Set as plus or minus for master work
I do. In the above-mentioned determination means 65, an assembly failure (NG)
Is determined, the lamp provided on the display unit 61
The corresponding lamp in column 61c is turned on, and the
Notify the assembly failure of the rub cotter 6. At this time, the monitor switch 66 is turned on.
Then, at least the change of the valve determined to be defective
Positions OUT1 to OUT3 are graphically displayed on monitor 61b
It is displayed numerically by the controller. The operator operates the numerical value displayed on the monitor 61b.
Recognizing that the valve cotter 6 is missing
The cause of the defect, such as whether the valve is
It is easy to grasp without checking the assembly status.
Wear. The assembly inspection of the valve cotter 6 is performed.
When the operation is completed, the detection unit feed cylinder 36 is retracted.
To make the detection unit 39 stand by at the initial position.
Motor 55 rotates in the reverse direction, causing the laser sensor 58 to move to the initial position.
In the standby position. The lifter cylinder 27 is retracted, and the
The work pallet 13 on which the head 1 is placed is lowered.
And place the work pallet 13 on the conveyor 12
The stopper cylinder 30 is retracted, and
The work pallet stopper 30a below the conveyor 12
Evacuate to As a result, the stopper is released and the cylinder
The work pallet 13 on which the head 1 is placed is transported by a conveyor.
Is transferred to the next step. As described above, according to the present embodiment, the valve
Mounting of valve cotter 6 based on bustem end 4a
Measure the position, and adjust this mounting position to a preset tolerance δ.
Check whether the valve cotter 6 has been assembled by checking whether it is
So that the tolerance δ is
Properly set in consideration of variations in manufacturing, assembly, etc.
To detect assembly failure of the valve cotter 6 with high accuracy.
be able to. The detection unit 39 corresponds to each valve.
Are arranged, so that the valve cotter 6 is not properly assembled.
Can be detected simultaneously for all valves and required for inspection.
The cycle time can be reduced. Further, the valve stem end 4a is
Since the position of the lub cotter 6 is measured,
Numerical display of the position of the valve cotter 6
The cause of the mounting failure can be easily grasped. The first to fourth judgment rods 48a to 48
Since d is a row of judgment rods arranged in a row, the laser
The amount of displacement can be easily detected simply by moving the sensor 58 directly.
And simplify the structure of the slide mechanism.
be able to. [0075] As described above, according to the present invention,
Check the valve cotter
The amount of displacement of the valve cotter based on the height of the system end
Based on the comparison between this displacement and tolerance
As a result, the manufacturing tolerance of the engine unit,
By setting according to the variation of assembly error etc.,
Inspection that can respond to the increase in the number of types
Even when the valve cotter is not completely floating,
Can be detected and the valve cotter is improperly assembled.
Etc. can be detected with high accuracy. Further, the height of the valve stem end and the valve
Move the cotter height on the judgment rods arranged in a line.
Measurement based on signals from non-contact sensors
Measurement makes it easy to measure
Measurement can be performed quickly, and the inspection efficiency can be improved.

[Brief description of the drawings] FIG. 1 is a front view of a valve cotter assembly inspection apparatus. FIG. 2 is a side view of the valve cotter assembly inspection apparatus. FIG. 3 is an enlarged view of a main part of FIG. 2; FIG. 4 is a view taken in the direction of arrow IV in FIG. 6; FIG. 5 is an enlarged sectional view of a main part of FIG. 1; FIG. 6 is a side view of the detection unit. FIG. 7 is a sectional view taken along line VII-VII of FIG. 8; 8 is a sectional view taken along line VIII-VIII of FIG. 7; FIG. 9 is a configuration diagram of an arithmetic processing unit. FIG. 10 is an explanatory diagram showing a measurement state by a laser sensor. FIG. 11 is a sectional view of a cylinder head. [Explanation of symbols] 1: Cylinder head 4a: Valve stem end 5: Valve spring retainer 6. Valve cotter 42… Valve stem detection rod 43… Valve cotter detection rod 47 ... Support arm 48a-48d ... judgment rod 58: Non-contact sensor (laser sensor) OUT1 to OUT3 ... displacement amount δ ... Tolerance

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F01L 3/24 B23P 19/00 303

Claims (1)

(57) [Claims 1] The height of the valve stem end when the valve spring retainer is hooked to the valve stem end projecting from the cylinder head via a valve cotter.
A valve stem detection lock that contacts the valve stem end
Measurement based on the signal from the non-contact sensor
The height of the valve cotter and the valve stem
Install the valve cotter detection rod around the detection rod.
Measurement based on the signal from the non-contact type sensor via the
Based on both measured values, the valve
Calculate the displacement of the cutter and compare the displacement with the tolerance.
An arithmetic processing unit that detects the assembly state of the valve cotter
A valve cotter assembly inspection device comprising: a valve stem detection rod; and a valve cotter detection rod.
Judgment rods are connected to the support rod via the support arm
The judgment rods are arranged in a line, and are movable along the judgment rod line above the judgment rod line.
A valve cotter assembling / inspection apparatus, characterized in that the above-mentioned non-contact type sensor is provided oppositely .