JPS63266105A - Setting method for valve clearance and device therefor - Google Patents

Abstract

PURPOSE:To make the adjustment of a clearance easily by opening a valve via an adjusting screw after leasing compressed air in a suction-exhaust passage in a state of closing this passage airtightly, and when pressure in the passage is dropped between the specified pressure values, making the adjusting screw go into reverse. CONSTITUTION:A valve clearance setter is made up of setting up each of setting mechanisms 40 and 40a at both sides of an exhaust valve 20 and an intake valve 22 in a symmetrical manner. For example, at the time of setting a clearance of the exhaust valve 20, an exhaust passage 26 is airtightly closed by a seal jig 50, then compressed air is sealed in the exhaust passage 26 from a supply source 202 via a pipe body 204. Next, a screwing device 88 is operated, turning an adjusting screw 36 round, and the exhaust valve 20 is opened. If so, the compressed air inside the exhaust passage 26 flows into the side of a combustion chamber 24 and thereby pressure inside the exhaust valve 26 is lowered to some extent, so that this pressure drop is detected by a pressure detector 212, and when it reaches the specified pressure, the adjusting screw 36 is rotated in reverse as much as the specified value, thereby securing the specified valve clearance.

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 mounted on a cylinder rod of a four-stroke engine, and a method for pressing these valves. When setting the clearance with the adjusting screws, air at a predetermined pressure is sealed in the passages defined in the cylinder rod and opened and closed by the respective valves, and then, under the spiral action of the adjusting screws, the respective valves are opened and closed. The clearance between the valve and the adjusting screw can be adjusted accurately 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 rotate it by a predetermined amount. The present invention relates to a method and apparatus for setting a valve clearance that can be easily and automatically set and that can improve the efficiency of the valve clearance setting work.

[Background of the Invention] In general, a fairly small clearance is formed between the intake valve and exhaust valve attached to a four-stroke engine and a member that presses them, such as an adjustment screw attached to a rocker arm. be done. This is a state in which no clearance is formed between the adjustment screw and the valve, i.e.,
If the adjustment screw and the valve are in contact with each other, when the valve expands due to the heat of the engine, the valve will be pressed by the adjustment screw, making it impossible to ensure the airtightness of the engine's combustion chamber, which will prevent the engine from running smoothly. This is because it will no longer work. 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, so considerable skill is required to obtain the desired gap.

Furthermore, 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 and 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 has to be done manually for each valve, which is disadvantageous 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 to overcome the above-mentioned disadvantages, and provides a method for supplying air at a predetermined 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 the adjustment screw, the valve is pressed to open the valve and lower the pressure in the passage, and a pressure sensor or the like detects that this pressure has dropped to a predetermined pressure, and the pressure is increased. The adjusting screw is rotated again by an electric signal derived from a sensor or the like to define a predetermined clearance between the valve and the adjusting screw, thereby setting the valve clearance accurately and automatically. It is an object of the present invention to provide a valve clearance setting method and apparatus that make it possible to further improve 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 pulp 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, comprising means for fixing a rocker arm attached to the engine, and the pressing member. 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 a means for displacing the pressing member. The means for displacing the pressing 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 station for setting the valve clearance of an engine 14 transported via a transport means 12, and the station 10 includes a valve clearance setting device 11 and a crankshaft gripping device 13. include.

In this case, the engine 14 includes a cylinder block 16 and a cylinder rod 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 rod 18, and coil springs 21.2 are attached to these valves 20.22.
3 is fitted externally. The exhaust valve 20 and the intake valve 2
Reference numeral 2 controls communication between a combustion chamber 24 defined in the cylinder block 16, an exhaust passage 26 defined in the cylinder rod 18, and an intake passage 28 (see FIG. 2). Further, a cam 30 having a plurality of bulges is disposed within the cylinder rod 18, and a rocker arm 32, 34 is disposed above the cam 30, which rotates a predetermined amount. Adjustment screws 36 and 38 are attached to the tips of these rocker arms 32 and 34, respectively.
6.38 is configured to be able to press the exhaust valve 20 and the intake valve 22, respectively, and the adjustment screw 36.38
A lock nut 37, 39 for preventing these unnecessary rotations is screwed into each of the bolts.

Therefore, the valve clearance setting device 11 is a first valve clearance setting device for setting the valve clearance of the 20 exhaust valves.
and a second setting mechanism 40a for setting the valve clearance on the intake valve 22 side. In this case, the first setting mechanism 40 and the second setting mechanism 40a are constructed approximately the same and are disposed at symmetrical positions. Therefore, here, the first setting mechanism 40 is
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 conveying means 12.
A base 44 is fixed to the upper surface of the . The pedestal 42
A cylinder 46 as a sealing means for airtightly closing the exhaust passage 26 is disposed above, and a seal jig 50 is engaged with the cylinder rod 48 of the cylinder 46. The seal jig 50 is configured to come into contact with the cylinder rod 18 of the engine 14 under the driving action of the cylinder 46 and close the exhaust passage 26 defined by the cylinder rod 18 .

On the other hand, as shown in FIG. 3, a sealing member 52 is disposed on one surface of the sealing jig 50 that comes into contact with the cylinder rod 18, and the sealing jig 50 is further provided with a compressed air supply source, which will be described later. A passage 54 for communicating the exhaust passage 26 is defined.

A rotary drive source 55 is attached to the upper surface of the base 44 via a mounting plate 53 (see FIG. 2).
A ball screw 56 is attached to a rotational drive shaft (not shown). The ball screw 56 extends in the six directions of the arrows, and is engaged with the slide base 58. Therefore, it will be easily understood that the slide base 58 can be displaced in the direction of arrow A by rotating the ball screw 56 under the driving action of the rotary drive source 55.

An angle member 60 is attached to the slide base 58, and a mounting plate 62 that extends outward 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, the angle member 60
A female threaded member 70 is rotatably engaged with the vertical portion of the female threaded member 70, and a gear 72 is attached to this female threaded member 70. in this case,
The gear 72 meshes with a gear 68 that engages with the rotary drive shaft 66 of the rotary drive source 64, a ball screw 74 is screwed into the female threaded member 70, and a connecting member is provided at the tip of the ball screw 74. 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 provided at the horizontal portion of the angle member 60.
is attached to the bearing member 78, and a shaft 80 is rotatably disposed on the bearing member 78. One end side of a bracket 82 engages 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 connecting member 76 is rotatably engaged with the first plate 84. Therefore, it is easily understood that the bracket 82 swings in the direction of the arrow B about the shaft 80 as a fulcrum via the connecting member 76 which is displaced in the direction of the arrow A under the driving action of the rotary drive source 64.

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 arranged substantially parallel to the second plate 86. The sliding member 96 is driven by a rotational drive source 98
It is constructed so that it can be displaced in the direction of arrow C under the driving action of (see FIG. 1) via a ball screw (not shown). 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 projects inwardly from the sliding member 96, and its end rotatably engages with the other end of the sliding member 96, and the ball screw 100 is engaged by the cylindrical moving member 102. In fact, the moving member 10
A thread groove is formed on the inner circumferential surface of 2, and this thread groove is threadedly engaged with the ball screw 100, and a mounting member 104 is supported on the moving member 102. Therefore, when the pole screw 100 is rotated under the driving action of the rotary drive source 99, the mounting member 104 can be displaced in the direction indicated by the arrow via the moving member 102.

As shown in FIG. 4, the mounting member 104 includes a housing 10.
6 is attached to the housing 106, and a rotary drive source 1 is attached to this housing 106.
08.110 are attached via cylinders 112.114, respectively. The rotational drive shaft 116 of the rotational 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 120.1
22. Furthermore, a first gear 124 is engaged with the connecting rod 118, and this first gear 124 meshes with a second gear 126 disposed inside the housing 106. In this case, a cylindrical rotating member 128 is fitted into the second gear 126 .

The rotating member 128 substantially fits into a bearing member 130 and a bearing member 132 that engage with the housing 106, and its tip 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 may be, for example,
The wrench 134 is configured to be engaged with the rotating member 128 by a spline or the like (not shown), and to rotate along with this rotation. Further, the stepped portion 12 of the rotating member 128
9 and the wrench 134, a coil spring 135 is interposed between the wrench 134 and the wrench 134.
Force it in the direction.

A recess 136 for engaging the lock nut 37 is formed at the tip of the wrench 134, and the recess 136 communicates with a small diameter hole of the wrench 134.

On the other hand, the rotary drive shaft 138 of the rotary drive source 110 is located inside the cylindrical body 114 and engages with a connecting member 140, and the connecting member 140 has a relatively long connecting rod 14.
2 is supported. The connecting rod 142 fits into bearings 144 , 146 that engage the pivot member 128 and extends through the pivot member 128 . Further, although not shown, a spline is formed on the distal end side of the connecting rod 142, and a hole 148 is formed at the end thereof, and a coil spring 150 is housed in the hole 148. ing. Furthermore, a screwdriver member 152 is engaged with the distal end of the connecting rod 142, and the screwdriver member 15
2 includes a large diameter portion 154 and a small diameter portion 156, and a hole 158 is bored in the large diameter portion 154.

In fact, the tip of the connecting rod 142 is fitted into the hole 158, and the peripheral surface of the hole 158 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 is connected to the wrench 134.
The screwdriver member 15 passes through a small diameter hole provided in the wrench 134 and enters the recess 136 of the wrench 134.
The end portion of the adjusting screw 36 is formed into a substantially letter shape so as to engage with a groove portion formed at the end portion of the adjusting screw 36.

The other screw means 90 is constructed in substantially the same manner as the screw means 88, and therefore, the same reference numerals are given to the same components as the screw means 88, and the same reference numerals are given to the same components as those of the screw means 88. Detailed explanation will be omitted.

The first and second setting mechanisms 40.40a are configured as described above, and the holding member 162 is suspended on the mounts 42.42a that constitute them. The holding member 162 includes a plate body 164.1 that projects obliquely from the frames 42 and 42a.
66 and a plate body 168 horizontally suspended between the plate bodies 164 and 166.
A holding plate 170 extending in a direction perpendicular to the drawing in FIG. 3 is fixed to the plate body 168. A plurality of cylinders 172 are attached to the holding plate 170, and the cylinder rods 172 of the cylinders 172 are attached to the holding plate 170.
a extends toward the engine 14, and its end portion is configured to be able to come into contact with the rocker arm 32 or 34 of the engine 14 under the driving action of the cylinder 172.

Next, the control mechanism of the setting mechanism 40, 40a that constitutes 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 has a setting mechanism 40.40a that constitutes the valve clearance setting device 11.
A control mechanism 200.200a is provided for controlling. Note that since the control mechanisms 200 and 200a have substantially the same configuration, one control mechanism 200 will be explained, and the other control mechanism 200a will be referred to with reference to the same components as the control mechanism 200. The numerals are given the symbol a, and detailed explanation thereof will be omitted.

That is, the control mechanism 200 controls the supply source 20 of compressed air.
2, and the supply source 202 communicates with the passage 54 of the sealing jig 50 via the tube body 204.

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 208 is connected to the sealing jig 50 side.
10 are connected. Furthermore, the pressure gauge 208 of the pipe body 204
．． A pressure detection circuit 212 is connected to a portion where 210 is 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 that the pressure on the engine 14 side has reached a preset reference pressure based on the differential 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).

A first control circuit 216 and a second control circuit 218 are connected to the control means 214 . The first control circuit 216 controls the rotational drive source 1 to rotate the adjusting screw 36 in a predetermined direction in response to an electric signal supplied to the control means 214.
This is for driving and controlling 0B. On the other hand, the second
The control circuit 218 is for driving and controlling the rotary drive source 110 for rotating the lock nut 37 to prevent unnecessary rotation of the adjusting screw 36 which has been rotated by a predetermined amount by the rotary drive source 10B. Furthermore, 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, one 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. Prevent it.

Next, the cylinder 172 is driven so that the cylinder rod 172
a to abut the rocker arms 32 and 34.

As a result, the rocker arms 32, 34 are pressed against the cam 30 of the engine 14. In this case, the cam 30 is set in a desired state so that the rocker arms 32, 34 do not come into contact with the bulging portion of the cam 30.

It goes without saying that in this state, the adjusting screws 36, 38 attached to the rocker arms 32, 34 are spaced apart from the valves 20, 22, respectively.

Therefore, the setting mechanism 40.40a is driven to set the valve 2.
Set the clearance between 0.22 and adjustment screw 36.38. That is, to explain the setting mechanism 40 side, first, the cylinder 46 is driven and the cylinder 46 is
cylinder rod 48 is displaced toward 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 rod 18 of the engine 14, thereby airtightly closing the exhaust passage 26 defined therein.

Next, the compressed air supply source 202 is driven 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 tube body 204 and the sealing jig 50. Next, the wrench 13 of the screw means 88,90
4 and the screwdriver member 152 are engaged with the rotary nut 37 and the adjusting screw 36, respectively.

In the second case, the screw means 88 may
．． A slight positional error may occur between the lock nut 37 and the adjusting screw 36. However, according to this embodiment, the spiral means 88.90 is 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 the Even if a positional error occurs as shown in FIG.
34, by displacing the screwdriver member 152 in the direction of the arrow, these can be engaged with the lock nut 37 and the adjustment screw 36, respectively. At that time, the wrench 134
After the screwdriver member 152 engages with the adjustment screw 36 and lock nut 37, these are further displaced in the direction of the arrow to keep the coil springs 135 and 150 in a compressed state.

Therefore, the rotation drive source 110 of the screw means 88, 90 is driven to rotate the rotation drive shaft 138 in a predetermined direction. This rotational force is transmitted to the screwdriver member 152 via the connecting member 140 and the connecting rod 142. Therefore, the adjustment screw 36 is rotated in a predetermined direction by the screwdriver member 152, and thereby the adjustment screw 36 is rotated in a predetermined direction.
They are displaced in the 0 direction and come into contact. Next, when the rotary drive source 110 is further rotated, the exhaust valve 20
The adjustment screw 36 in contact with the exhaust valve 20 presses the exhaust valve 20 in the opening direction. 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 compressed air sealed in the exhaust passage 26 flows out to the combustion chamber 24 side, 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 this time, since compressed air is supplied from the pressure supply source 202 to the exhaust passage 26 via the pipe body 204 and the passage 54, the pressure in the exhaust passage 26 corresponds to the opening degree of the exhaust valve 20. This results in a predetermined amount of descent.

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. Under the rotational action of the rotary drive source 110, the adjustment screw 36 is rotated in the opposite direction, thereby causing the exhaust valve 2
0 is a coil spring 2 that engages with the exhaust valve 20.
1, it is displaced in the direction of closing the exhaust passage 26. In this case, the control means 214 includes the exhaust valve 20
The distance until the valve 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, are stored in advance.

Therefore, when the adjusting screw 36 is returned by the sum of the distance until the exhaust valve 20 closes the exhaust passage 26 and the size of the valve clearance, the control means 214 causes the first control circuit 216 to control the rotary drive source 110. issue a stop command. 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 rotational drive shaft 116 under the driving action of the rotational drive source 108, and the connecting rod 118
Since the first gear 124 is engaged with the first gear 124, the first gear 124 rotates in a predetermined direction, and the rotation of the first gear 124 causes the rotating member 128 to rotate through the second gear 126 that meshes with the first gear 124. This results in rotation in a predetermined direction. The rotating member 12
A wrench 134 is engaged with the tip of the wrench 13.
4 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 rotated in a predetermined direction.
The belt was 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. When the tightening torque of the lock nut 37 reaches a predetermined amount, the control means 214 generates a stop signal for the rotary drive source 110 via the second control circuit 218, thereby stopping the rotary drive source 110.

As described above, it is possible to automatically set a predetermined amount of valve clearance between the exhaust valve 20 and the adjusting screw 36, and also to correspond to various types of engines as described above. It is possible to perform the setting work accurately and efficiently.

The other setting mechanism 40a has substantially the same effect as the setting mechanism 40, and can also set the valve clearance at the same time.

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 exhaust passage that are opened and closed by the valve are sealed, and a predetermined pressure is compressed in the intake passage and the exhaust passage. Air is introduced. Next, the adjusting screw that engages with the rocker arm is turned, thereby pressing the valve and opening the valve until the pressure in the intake passage and the exhaust passage drops to a predetermined pressure, and then turning the adjusting screw. The valve 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 adjusting screw. in this case,
The amount of rotation of the adjusting screw is stored in advance in the control mechanism, 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 work can be performed automatically in response to various types of engines. The advantage is 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 these embodiments.
For example, it is possible to combine a plurality of control mechanisms into a single control mechanism, and various improvements and changes in design are of course possible without departing from the gist of the present invention.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of an apparatus for implementing the valve clearance setting method according to the present invention, FIG. 2 is a partially omitted front view of the apparatus shown in FIG. 1, and FIG. 2 is a partially omitted cross-sectional explanatory diagram of a sealing jig constituting the apparatus shown in FIG. 2, FIG. 3 is a schematic explanatory diagram of a control mechanism that constitutes the apparatus shown in FIG. 2. FIG.

Claims (9)

[Claims] (1) When setting the clearance between the valve attached to the engine and the pressing member that presses the valve, the first step is to seal the passage opened and closed by the valve, and to inject compressed air into the passage. a second step of supplying, a third step of opening the valve under the displacement action of the pressing member to lower the pressure in the passage, and the third step lowering the pressure in the passage to a predetermined pressure. a fourth step of detecting this, 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 valve clearance setting method characterized by: (2) A valve clearance setting method according to claim 1, wherein 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 fixing the pressing member to a predetermined position. The setting mechanism includes a setting mechanism that displaces the setting mechanism in the direction, and a control mechanism that controls the drive of the setting mechanism, and the setting mechanism includes means for sealing a passage opened and closed by a valve, and a means for displacing the pressing member. A valve clearance setting device characterized in that the means for displacing the valve is configured to be displaceable at least two-dimensionally in accordance with the model of the engine, etc. (4) The valve clearance setting device according to claim 3, wherein 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 is a screwdriver that engages with the adjustment screw. and a wrench that engages with 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 configured to be swingable so as to engage with a valve attached to the engine. Valve 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 rotates under the driving action of the rotational drive sources. A valve clearance setting device comprising a ball screw. (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 can freely move forward and backward with respect to the passage;
a sealing jig attached to the cylinder rod of the cylinder, the sealing jig is provided with a sealing member, and the sealing jig is provided with a passage for introducing compressed air into the passageway. Valve clearance setting device. (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.