JPH0535243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for setting valve clearance, and more particularly, to an intake valve and an exhaust valve installed in the cylinder head of a four-stroke engine, and a valve clearance setting method and device for setting valve clearance. When setting the clearance with the adjusting screws, air at a predetermined pressure is sealed in the passages defined in the cylinder head and opened and closed by the respective valves, and then, under the spiral action of the adjusting screws, the respective clearances are set. The valve and the adjusting screw are connected by opening the valve until the pressure in the passage is reduced to a preset pressure, and then rotating the adjusting screw in the opposite direction to retract it by a predetermined amount. The present invention relates to a method and apparatus for setting a valve clearance, which allows the clearance to be set accurately and automatically, and also makes it possible to improve the efficiency of the valve clearance setting work.

[Background of the Invention] In general, an intake valve and an exhaust valve attached to a four-stroke engine, and members that press the valves,
For example, a fairly small clearance is created between the adjustment screw and the rocker arm. This is because if no clearance is formed between the adjusting screw and the valve, that is, if the adjusting screw and the valve are in contact with each other, when the valve expands due to the heat of the engine, the adjusting screw will press the valve. This is because the airtightness of the combustion chamber of the engine cannot be ensured, and the engine cannot operate smoothly. Therefore, as described above, a clearance is provided between the adjustment screw and the valve to absorb the thermal expansion of the valve.

Incidentally, the setting work of the valve clearance has conventionally been carried out by interposing a gap gauge between the valve and the adjusting screw and moving the adjusting screw forward and backward. That is, this is achieved by a method in which the gap gauge is once clamped between an adjustment screw and a valve that are displaced, and then the gap gauge is removed.

However, in this case, a slight difference in the clearance occurs due to the pressing force of the adjustment screw when clamping the gap gauge, and considerable skill is required to obtain the desired gap. Also,
It has been pointed out that the above setting method has a drawback in that it is difficult to automate the valve clearance setting work because the position of the clearance gauge insertion/removal work differs depending on the engine model.

Furthermore, in recent years, automobile engines have come to be assembled more efficiently through line production. However, as described above, the setting of the valve clearance must be done manually for each valve, which poses an inconvenience in that it reduces the efficiency of the engine assembly work performed on the line production.

[Object of the Invention] The present invention has been made in order to overcome the above-mentioned disadvantages, and it is an object of the present invention to supply air at a constant pressure into the passages opened and closed by the valves when setting the valve clearance of a four-stroke engine. At the same time, by rotating an adjustment screw, a valve is pressed to open the valve to lower the pressure in the passage, and a pressure sensor or the like detects that this pressure has dropped to a predetermined pressure. , the adjusting screw is rotated again by an electric signal derived from this pressure sensor etc. to define a predetermined clearance between the valve and the adjusting screw, thereby adjusting the valve clearance accurately and automatically. It is an object of the present invention to provide a method and apparatus for setting a valve clearance, which allows the valve clearance to be set accurately and further improves the efficiency of the setting work.

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention provides a method for setting a clearance between a valve attached to an engine and a pressing member that presses the valve, which is opened and closed by the valve. a first step of sealing the passageway; a second step of supplying compressed air into the passageway; and a third step of opening a valve under the displacement action of the pressing member to lower the pressure in the passageway. a fourth step of detecting that the pressure in the passage has decreased to a predetermined pressure due to the third step, and displacing the pressing member in the opposite direction to the third step to close the valve and A fifth step of providing a clearance between the valve and the pressing member.

Furthermore, the present invention provides a device for setting a clearance between a valve attached to an engine and a pressing member that presses the valve, which includes means for fixing a rocker arm attached to the engine, and a device for setting a clearance between a valve attached to an engine and a pressing member that presses the valve. The setting mechanism includes a setting mechanism for displacing in a predetermined direction, and a control mechanism for controlling the drive of the setting mechanism, and the setting mechanism includes means for sealing a passage opened and closed by a valve, and means for displacing a pressing member. The means for displacing the member is characterized in that it is configured to be displaceable at least two-dimensionally in accordance with the model of the engine.

[Embodiments] Next, preferred embodiments of the valve clearance setting method according to the present invention in relation to an apparatus for carrying out the method will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a conveying means 12.
The station 10 includes a valve clearance setting device 11 and a crankshaft gripping device 13. In this case, the engine 14 consists of a cylinder block 16 and a cylinder head 18 fixed to the upper part of the cylinder block 16. An exhaust valve 20 and an intake valve 22 are attached to the cylinder head 18, and these valves 2
Coil springs 21 and 23 are externally fitted to 0 and 22, respectively. The exhaust valve 20 and the intake valve 22
is a combustion chamber 24 defined in the cylinder block 16.
and an exhaust passage 26 defined by the cylinder head 18.
This controls the communication between the intake passage 28 and the intake passage 28 (see FIG. 2). Further, a cam 30 having a plurality of bulges is disposed within the cylinder head 18, and rocker arms 32, 34 are disposed above the cam 30, which rotate by a predetermined amount.
Adjustment screws 36 and 38 are attached to the tips of these rocker arms 32 and 34, respectively, and these adjustment screws 36 and 38 are configured to be able to press the exhaust valve 20 and intake valve 22, respectively, and Lock nuts 37 and 39 are screwed into the lock nuts 36 and 38, respectively, to prevent these unnecessary rotations.

Therefore, the valve clearance setting device 11
A first setting mechanism 40 for setting the valve clearance on the exhaust valve 20 side and the intake valve 22
and a second setting mechanism 40a for setting the side valve clearance. In this case, the first setting mechanism 40 and the second setting mechanism 40a
The first setting mechanism 40 and
For the second setting mechanism 40a, reference numerals indicating the same components as those of the first setting mechanism 40 are given the symbol a, and detailed explanation thereof will be omitted.

As shown in FIG. 2, the first setting mechanism 40 includes a pedestal 42 disposed on the side of the conveyance means 12, and a base 44 is fixed to the upper surface of the pedestal. A cylinder 46 is provided on the pedestal 42 as a sealing means for airtightly closing the exhaust passage 26.
A seal jig 50 is engaged with the cylinder rod 48 of the cylinder 46. The sealing jig 50 is configured to come into contact with the cylinder head 18 of the engine 14 under the driving action of the cylinder 46 and close the exhaust passage 26 defined in the cylinder head 18.

On the other hand, as shown in FIG.
A sealing member 52 is disposed on one surface that comes into contact with the cylinder head 18 of No. has been done.

A rotary drive source 55 is attached to the upper surface of the base 44 via a mounting plate 53 (see FIG. 2), and a ball screw 56 is attached to a rotary drive shaft (not shown) of this rotary drive source 55. The ball screw 56 extends in the direction of arrow A, and the slide base 5
8 engages. Therefore, the slide base 58
is a ball screw 56 under the driving action of a rotational drive source 55.
It will be easily understood that it is possible to displace it in the direction of arrow A by rotating .

An angle member 60 is attached to the slide base 58.
is attached to the angle member 60, and an outwardly extending mounting plate 62 is fixed to the angle member 60. A rotary drive source 64 is attached to the mounting plate 62, and a gear 68 is engaged with a rotary drive shaft 66 of the rotary drive source 64. Further, a female thread member 70 is fixed to the vertical portion of the angle member 60, and a gear 72 is rotatably mounted on the opposite side of the female thread member 70. This gear 72 meshes with a gear 68 that engages with a rotational drive shaft 66 of a rotational drive source 64, and a ball screw 74 is screwed into the gear 72 and the female threaded member 70, and the tip of this ball screw 74 has a A connecting member 76 is attached. Therefore, when the rotary drive shaft 66 is rotated under the driving action of the rotary drive source 64, the connecting member 76 can be displaced in the direction of arrow A via the gears 68, 72 and the female screw member 70.

On the other hand, a bearing member 78 is attached to the horizontal portion of the angle member 60, and the shaft 8 is attached to the bearing member 78.
0 is rotatably arranged. One end side of a bracket 82 is engaged with the shaft 80, and in this case, the bracket 82 substantially includes a first plate 84 that engages with the shaft 80 and a second plate 84 that is fixed to the first plate 84. The first plate body 84 is composed of a plate body 86;
The connecting member 76 is rotatably engaged with the connecting member 76 . Therefore, the bracket 82 is connected to the rotational drive source 64.
The connecting member 7 is displaced in the direction of arrow A under the driving action of
It is easily understood that the shaft 80 swings in the direction of the arrow B via the shaft 80 as a fulcrum.

Screw means 88 and 90 are attached to the second plate 86 of the bracket 82. That is, the spiral means 88 includes a sliding member 96 having a substantially U-shaped cross section and engaging with a pair of guide rails 92 and 94 disposed substantially parallel to the second plate 86.
The sliding member 96 is configured to be movable in the direction of arrow C under the driving action of a rotational drive source 98 via a ball screw (not shown) (see FIG. 1). A rotation drive source 99 is attached to one end surface of the sliding member 96, and a ball screw 100 is engaged with a rotation drive shaft (not shown) of the rotation drive source 99 (see FIG. 2). In this case, the ball screw 100 is
6 protrudes inwardly, and its end rotatably engages with the other end of the sliding member 96,
The ball screw 100 includes a cylindrical moving member 10.
2 engages. In fact, a thread groove is formed on the inner circumferential surface of the movable member 102, and this thread groove engages with the ball screw 100, and a mounting member 104 is supported on the movable member 102. Therefore, the mounting member 104 is connected to the rotational drive source 99.
When the ball screw 100 is rotated under the driving action of , it can be displaced in the direction of arrow D via the moving member 102 .

As shown in FIG. 4, a housing 106 is attached to the mounting member 104, and rotary drive sources 108 and 110 are mounted on the cylindrical body 11, respectively.
2,114. The rotary drive shaft 116 of the rotary drive source 108 is located inside the cylindrical body 112 and engages with a connecting rod 118, and the connecting rod 118 enters the inside of the housing 106 and engages with the housing 106. bearing member 120,
122. Furthermore, the connecting rod 11
8 is engaged with a first gear 124, and this first gear 124 is engaged with a second gear 124 disposed inside the housing 106.
It meshes with the gear 126 of. In this case, a cylindrical rotating member 128 is fitted into the second gear 126 .

The rotating member 128 substantially includes the housing 10.
The bearing member 130 and the bearing member 132 that are engaged with the housing 106 are fitted into each other, and the distal end thereof protrudes from the housing 106 toward the engine 14 side. Further, the distal end of the rotating member 128 has a slightly smaller diameter via a stepped portion 129, and a wrench 134 having holes of different sizes is fitted into this small diameter portion. In this case, the large-diameter hole of the wrench 134 is configured to engage with the rotating member 128 by, for example, a spline (not shown), and the wrench 134 rotates as the wrench 134 rotates. Further, the step portion 129 of the rotating member 128 and the wrench 1
A coil spring 135 is interposed between the wrench 134 and the engine 1.
Force it in four directions.

A lock nut 3 is attached to the tip of the wrench 134.
A recess 136 is formed for engaging with the wrench 134, and this recess 136 communicates with the small diameter hole of the wrench 134.

On the other hand, the rotary drive shaft 13 of the rotary drive source 110
8 is inside the cylindrical body 114 and connects the connecting member 140.
A relatively long connecting rod 142 is supported by the connecting member 140. The connecting rod 142 fits into bearings 144, 146 that engage the rotating member 128 and is connected to the rotating member 1.
It passes through 28. Further, the connecting rod 14
Although not shown, a spline is formed on the tip end of the spring 2, and a hole 148 is formed at the end of the spline, and a coil spring 150 is housed in the hole 148. Further, a screwdriver member 152 is engaged with the distal end of the connecting rod 142, and the screwdriver member 152 includes a large diameter portion 154 and a small diameter portion 156, and a hole portion 158 is bored in the large diameter portion 154. will be established. In fact, the tip of the connecting rod 142 fits into the hole 158 and the hole 15
The peripheral surface portion of the connecting rod 142 is configured to engage with a spline (not shown) formed on the connecting rod 142.

On the other hand, the coil spring 150 is in pressure contact with an end surface defining the hole 158. Therefore, the screwdriver member 152 is urged toward the engine 14 under the pressing action of the coil spring 150.

The small diameter portion 156 of the screwdriver member 152 passes through a small diameter hole provided in the wrench 134 and enters the recess 136 of the wrench 134.
The end of this screwdriver member 152 is formed into a substantially linear shape so as to engage with a groove formed in the end of the adjustment screw 36.

Note that the other screw means 90 is the same as the screw means 88.
The spiral means 9 is constructed in substantially the same manner as
0, the same components as those of the spiral means 88 are given the same reference numerals, and detailed explanation thereof will be omitted.

The first and second setting mechanisms 40 and 40a are constructed as described above, and the mount 4 that constitutes them is
A holding member 162 is suspended between 2 and 42a. The holding member 162 includes plates 164 and 166 that project obliquely from the frames 42 and 42a and the plate 16.
4,166 and a plate body 168 horizontally suspended,
A holding plate 170 extending in a direction perpendicular to the drawing in FIG. 2 is fixed to the plate 168. The holding plate 170 includes a plurality of cylinders 172.
The cylinder rod 172a of the cylinder 172 extends in the direction of the engine 14, and its end is connected to the rocker arm 32 or 3 of the engine 14 under the driving action of the cylinder 172.
4 and is configured to be able to come into contact with it.

Next, a control mechanism for the setting mechanisms 40 and 40a that constitute the valve clearance setting device 11 will be explained.

As shown in FIG. 5, the valve clearance setting device 11 according to the present invention includes a control mechanism 20 for controlling the setting mechanisms 40, 40a constituting the device.
0,200a are arranged. Note that since the control mechanisms 200 and 200a have substantially the same configuration, one control mechanism 200 will be explained, and the reference numerals indicating the same components as the control mechanism 200 will be used for the other control mechanism 200a. The reference numeral a is given and detailed explanation thereof will be omitted.

That is, the control mechanism 200 includes a compressed air supply source 202, and the supply source 202 is connected to the tube body 20.
4 to a passage 54 of the sealing jig 50. In addition, the pipe body 204 has a throttle valve 206 interposed therebetween, and a pressure gauge 208 is connected to the supply source 202 side of the throttle valve 206, and a pressure gauge 210 is connected to the sealing jig 50 side. Ru. Further, a pressure detection circuit 212 is connected to a portion of the tube body 204 to which the pressure gauges 208 and 210 are connected.
The pressure detection circuit 212 uses a differential pressure sensor to detect the differential pressure between the pressure on the air supply source 202 side and the pressure on the engine 14 side, and determines from the differential pressure that the pressure on the engine 14 side has reached a preset reference pressure. This is detected and sent to the control means 214 as a digital signal using a current converter or an A/D converter (not shown).

The control means 214 substantially includes a CPU;
A first control circuit 216 and a second control circuit 218 are connected to this control means 214 . The first control circuit 216 is for driving and controlling the rotary drive source 110 to rotate the adjusting screw 36 in a predetermined direction in accordance with an electric signal supplied to the control means 214. On the other hand, the second control circuit 218
is a rotary drive source 10 for rotating the lock nut 37 for preventing unnecessary rotation of the adjusting screw 36 which has been rotated by a predetermined amount by the rotary drive source 110;
This is for controlling the drive of 8. Further, a torque detection circuit 220 is connected to the control means 214, and the torque detection circuit 220 detects the tightening torque of the lock nut 37 and outputs a signal indicating that the lock nut 37 has been tightened to a predetermined torque. The control means 214 is configured to receive the signal.

The apparatus for implementing the valve clearance setting method according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, as shown in FIG. 1, the engine 14 transported via the transport means 12 is stopped at a predetermined position, and the crankshaft of the engine 14 is gripped by the crankshaft gripping device 13 to prevent its rotation in advance. I'll keep it.

Next, the cylinder 172 is driven to bring the cylinder rod 172a into contact with the rocker arms 32, 34. As a result, the rocker arms 32, 3
4 is brought into pressure contact with the cam 30 of the engine 14. In this case, the flow arms 32 and 34 are attached to the cam 30 so that the flow arms 32 and 34 do not come into contact with the bulge of the cam 30.
Set to the desired state. It goes without saying that in this state, the adjusting screws 36 and 38 attached to the rocker arms 32 and 34 are spaced apart from the valves 20 and 22, respectively.

Therefore, the setting mechanism 40, 40a is driven to set the clearance between the valves 20, 22 and the adjustment screws 36, 38. That is, to explain the setting mechanism 40 side, first, the cylinder 46
by driving the cylinder rod 4 of the cylinder 46.
8 to the engine 14 side. As a result, the sealing jig 50 that engages with the tip of the cylinder rod 48 comes into contact with the cylinder head 18 of the engine 14, thereby airtightly closing the exhaust passage 26 defined therein. Next, a source of compressed air 20
2 to seal compressed air at a predetermined pressure from the supply source 202 into the exhaust passage 26 through the passage 54 defined by the pipe body 204 and the sealing jig 50. Next, the wrench 134 of the screw means 88, 90
and the screwdriver member 152 respectively with the lock nuts 37.
and the adjustment screw 36.

In this case, if a slight positional error occurs between the screw means 88, 90, the lock nut 37, and the adjusting screw 36 due to a deviation in the stop position of the engine 14, a difference in the model of the engine 14, etc. There is. However, according to this embodiment, the spiral means 88, 90 are configured to be displaceable in the directions of arrows A, B, and C under the driving action of the rotational drive sources 55, 64, and 98, so that Even if a positional error occurs, the spiral means 88, 90
Wrench 134 and screwdriver member 15 that constitute
2 to a suitable position, the rotational drive source 99
By driving the wrench 134 and the screwdriver member 152 in the direction of arrow D, these can be engaged with the lock nut 37 and the adjusting screw 36, respectively. At this time, after the wrench 134 and the screwdriver member 152 engage with the adjusting screw 36 and the locking nut 37, they are further tightened by the arrow D.
The coil springs 135, 15 are displaced in the direction
Leave 0 in a compressed state.

Therefore, the rotary drive source 110 of the spiral means 88, 90 is driven to rotate the rotary drive shaft 183 in a predetermined direction. This rotational force is applied to the connecting member 14
0, screwdriver member 15 via connecting rod 142
2. Therefore, the screwdriver member 15
2, the adjusting screw 36 is rotated in a predetermined direction, whereby the adjusting screw 36 is displaced toward the exhaust valve 20 and comes into contact with the exhaust valve 20. Next, when the rotary drive source 110 is further rotated, the adjustment screw 36 in contact with the exhaust valve 20 presses the magnetic valve 20 in a direction to open it. This pressing force displaces the exhaust valve 20 in the opening direction against the elastic force of the coil spring 21 that engages the exhaust valve 20. As a result, the exhaust passage 26
The compressed air enclosed in the combustion chamber 24 flows out toward the combustion chamber 24, and is led out from the combustion chamber 24 through a spark plug mounting hole (not shown) or the like. Therefore,
The pressure within the exhaust passage 26 will decrease. At that time, from the pressure supply source 202, the pipe body 20
4. Since compressed air is supplied to the exhaust passage 26 through the passage 54, the pressure within the exhaust passage 26 drops by a predetermined amount corresponding to the opening degree of the exhaust valve 20.

When the pressure in the exhaust passage 26 drops to a preset reference pressure, the pressure detection circuit 212 detects this and sends an electrical signal to the control means 214.
The control means 214 reversely rotates the rotary drive source 110 via the first control circuit 216 based on this electric signal. The adjustment screw 36 is rotated in the opposite direction under the rotational action of the rotational drive source 110,
This causes the exhaust valve 20 to
0 and is displaced in the direction of closing the exhaust passage 26 under the force of the spring force of the coil spring 21 that is engaged with the coil spring 21. In this case, the control means 214 stores in advance the distance until the exhaust valve 20 closes the exhaust passage 26 and the gap defined between the exhaust valve 20 and the adjustment screw 36, that is, the size of the valve clearance. has been done. Therefore, the control means 214
When the adjustment screw 36 is returned by an amount equal to the sum of the distance until the exhaust valve 20 closes the exhaust passage 26 and the size of the valve clearance, a command is issued to the first control circuit 216 to stop the rotational drive source 110.
As a result, a predetermined valve clearance is obtained between the adjustment screw 36 and the exhaust valve 20.

Next, the control means 214 sends a signal to a second control circuit 218 that drives and controls the rotary drive source 108, and the rotary drive source 108 is rotationally driven by this signal. The connecting rod 118 rotates in a predetermined direction via the rotary drive shaft 116 under the driving action of the rotary drive source 108, and the first gear 124 is engaged with the connecting rod 118, so that the first gear 124
rotates in a predetermined direction, and the rotation of the first gear 124 causes the rotating member 128 to rotate in a predetermined direction via the second gear 126 that meshes with the first gear 124. A wrench 134 is engaged with the tip of the rotating member 128, and this wrench 134 is engaged with the lock nut 37. Therefore, the lock nut 37 is rotated in a predetermined direction via the wrench 134 under the driving action of the rotation member 128, and the adjustment screw 36 is tightened to prevent unnecessary rotation. When the lock nut 37 is tightened to a predetermined torque, the torque detection circuit 220 detects the torque and sends a detection signal to the control means 214. The control means 21
4, when the tightening torque of the lock nut 37 reaches a predetermined amount, a stop signal for the rotary drive source 110 is derived via the second control circuit 218, whereby the rotary drive source 110 is stopped.

As above, install the exhaust valve 20 and adjusting screw 36.
It is possible to automatically set a predetermined amount of valve clearance between the engine and the engine, and as described above, it is possible to set a predetermined amount of valve clearance corresponding to a wide variety of engines. Therefore, the valve clearance setting work can be performed accurately and efficiently. It is possible.

Note that the other setting mechanism 40a is also the same as the setting mechanism 4.
0, and the valve clearance can be set in the same way. Therefore, it becomes possible to more efficiently set the valve clearance of the engine 14.

[Effects of the Invention] As described above, according to the present invention, when setting the valve clearance of an engine, the intake passage and the exhaust passage opened and closed by the valve are sealed, and a predetermined pressure is maintained in the intake passage and the exhaust passage. compressed air is introduced. Next, an adjustment screw that engages with the rocker arm is screwed, thereby pressing the valve and opening the valve until the pressure in the intake passage and exhaust passage drops to a predetermined pressure, and then the adjustment screw is rotated by a predetermined amount in the opposite direction to the above to close the valve and provide a desired clearance between the valve and the adjustment screw. In this case, the amount of rotation of the adjusting screw is stored in the control mechanism in advance, thereby allowing the clearance between the valve and the adjusting screw to be set as desired. Therefore, unlike the conventional technology, there is no need to insert a feeler gauge or the like, and the valve clearance selection process can be automatically performed in response to various types of engines.As a result, the valve clearance setting process can be performed automatically This has the advantage that it can be carried out efficiently and accurately.

Furthermore, according to the valve clearance setting method and device according to the present invention, it is possible to simultaneously set the valve clearance for a plurality of valves attached to the engine, so that the valve clearance setting work can be further simplified. The effect is that it can be carried out efficiently.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to this embodiment. For example, it is possible to combine multiple control mechanisms into a single control mechanism. Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an apparatus for implementing the valve clearance setting method according to the present invention, and FIG.
The figure is a partially omitted front view of the device shown in FIG. 1, FIG. 3 is a partially omitted cross-sectional explanatory view of a sealing jig that constitutes the device shown in FIGS. 1 and 2, and FIG. FIG. 5 is a schematic explanatory diagram of a control mechanism constituting the apparatus shown in FIGS. 1 and 2. FIG. 12...Transporting means, 14...Engine, 20...
...Exhaust valve, 26...Exhaust passage, 40, 40a
... Setting mechanism, 46 ... Cylinder, 58 ... Slide base, 88, 90 ... Screw means, 102 ...
...Moving member, 134... Wrench, 152... Screwdriver member, 200, 200a... Control mechanism, 20
2... Supply source, 212... Pressure detection circuit, 214
. . . Control means, 220 . . . Torque detection circuit.

Claims (1)

[Claims] 1. When setting the clearance between a valve attached to the engine and a pressing member that presses the valve, a first step of sealing a passage opened and closed by the valve; a second step of supplying compressed air to the pressure member; a third step of lowering the pressure in the passage by opening a valve under the displacement action of the pressing member; and a third step of lowering the pressure in the passage to a predetermined level. a fourth step of detecting that the pressure has dropped to the pressure; and a fifth step of displacing the pressing member in the opposite direction to the third step to close the valve and creating a clearance between the valve and the pressing member. A method for setting a valve clearance, characterized by comprising a process. 2. In the method described in claim 1,
A valve clearance setting method in which the setting method is controlled to be performed substantially simultaneously on a plurality of valves attached to an engine. 3 A device for setting a clearance between a valve attached to an engine and a pressing member that presses the valve, comprising means for fixing a rocker arm attached to the engine, and a means for displacing the pressing member in a predetermined direction. and a control mechanism that performs drive control of the setting mechanism, and the setting mechanism includes means for sealing a passage opened and closed by a valve, and means for displacing a pressing member, and displacing the pressing member. A valve clearance setting device characterized in that the means is configured to be displaceable at least two-dimensionally in accordance with the model of the engine, etc. 4. In the device according to claim 3,
A valve clearance setting device in which the means for fixing the Rocker arm is a cylinder that can move forward and backward with respect to the Rocker arm. 5. In the device according to claim 3 or 4, a plurality of setting mechanisms are provided, and the means for displacing the pressing member constituting the setting mechanism includes a screwdriver member that engages with an adjustment screw; A valve clearance setting device comprising: a wrench that engages a lock nut that controls rotation of the adjustment screw. 6. In the device according to any one of claims 3 to 5, the means for displacing the pressing member is a valve configured to be swingable to engage with a valve attached to an engine. Clearance setting device. 7. In the device according to any one of claims 3 to 6, the means for displacing the pressing member includes a plurality of rotational drive sources and a ball screw that rotates under the driving action of the rotational drive sources. A valve clearance setting device comprising: 8. In the device according to any one of claims 3 to 7, the means for sealing the passage opened and closed by the valve includes a cylinder that is movable forward and backward with respect to the passage, and a cylinder rod of the cylinder. What is claimed is: 1. A valve clearance setting device comprising: a sealing jig, the sealing jig having a sealing member disposed thereon, and a passage provided in the sealing jig for introducing compressed air into the passageway. 9. A valve clearance setting device according to any one of claims 3 to 8, wherein the control mechanism is provided with a compressed air supply source.