JP4018906B2 - Valve clearance adjustment device for engine valve system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adjusting device for setting a valve clearance of a valve system of an engine.
[0002]
[Prior art]
A valve operating system of an engine such as an automobile includes an intake / exhaust valve provided in a cylinder head and a camshaft for driving the intake / exhaust valve. The camshaft is provided with a cam, and the intake and exhaust valves are driven to open and close through the rocker arm by the rotation of the camshaft. An adjusting screw for adjusting the valve clearance is provided between the upper end of the intake / exhaust valve stem and the rocker arm, and the swinging motion of the rocker arm is transmitted to the intake / exhaust valve via the adjusting screw. After the adjustment screw is adjusted to a predetermined position, the position is locked by a lock nut.
[0003]
In order to open and close the intake / exhaust valve with a predetermined lift amount, the valve clearance needs to be in a predetermined position, and the valve clearance adjustment by the adjusting screw is required to have high accuracy. For this reason, the valve clearance adjustment is manually performed by an operator on the assembly line using a thickness gauge. The valve clearance adjustment work requires a lot of work with one engine, requires a lot of work and time, and it has been considered that the adjustment varies depending on the skill level of the worker.
[0004]
Therefore, conventionally, a valve clearance adjusting device for driving a tool (bit) for rotating an adjusting screw and a socket for rotating a lock nut has been used. The conventional valve clearance adjusting device is configured to drive the bit shaft and the socket shaft at the same time by changing the rotational speed and the rotational torque with a single drive source. Then, the adjusting screw is rotated by a predetermined amount by the bit shaft through the thickness gauge, and the lock nut is rotated by the socket shaft. When the thickness gauge is sandwiched in a predetermined state, the rotation of the bit shaft is stalled and the socket shaft is rotated. The lock nut is tightened by rotating.
[0005]
By using the valve clearance adjusting device, the adjustment screw can be rotated and the lock nut can be tightened manually.
[0006]
[Problems to be solved by the invention]
However, since the conventional valve clearance adjustment device has a single drive source, the reaction force increases when the lock nut is tightened, and the reaction force that can be supported by the operator is limited. Could not be applied. Further, since there is no mechanism for preventing the adjustment screw and the lock nut from rotating together, the adjustment screw may rotate together when the lock nut is tightened. Furthermore, since the drive source is rotating simultaneously on one axis, it is necessary to manage the dimensions from the bottom surface of the lock nut to the seat surface and the projecting amount of the adjusting screw. If the dimension is too small, the lock nut may be tightened before the adjustment screw reaches a predetermined position.
[0007]
For example, Japanese Patent Application Laid-Open No. 5-65812 and Japanese Patent No. 2830715 propose valve clearance adjusting devices. These devices eliminate the misalignment of the adjusting screw, or measure the clearance directly by measuring the clearance. This is a technique for measuring, and requires a complicated mechanism and is expensive. Therefore, this technique is difficult to apply except for mass production.
[0008]
The present invention has been made in view of the above situation, and provides a valve clearance adjustment device that can adjust the adjustment screw reliably without using a complicated mechanism and without the adjustment screw and the lock nut rotating together. For the purpose.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention of claim 1 includes an adjustment screw rotating mechanism including a tool having a tip portion that can be fitted to an adjustment screw and a tool actuator capable of rotating the tool, and a lock nut. A lock nut tightening mechanism including a socket actuator that can be fitted and a socket actuator that can rotate the socket, and a brake plate that is non-rotatably attached to the rotating shaft of the tool in the axial direction.MoveThe brake plate andLock nut tightening mechanismA brake mechanism that applies a braking force to the rotary shaft of the tool by engaging grooves with a brake base fixed to the brake base, and a control means that operates the brake mechanism in conjunction with the tightening operation of the lock nut tightening mechanism When the lock nut is tightened, the adjustment screw is prevented from rotating, and the adjustment of the valve clearance can be performed without the co-rotation of the adjustment screw and the lock nut.
[0011]
  Claim 2In the present invention, the rotation axis of the tool actuator and the rotation axis of the socket actuator are arranged as parallel independent axes, and the reaction force is received by the apparatus itself when the lock nut is tightened. In this case, preferably, the reaction force can be further reduced by using the socket actuator as an intermittent drive type and the socket as an impact impact wrench.
[0012]
  Claim 3According to the present invention, the lock nut tightening mechanism is provided with a timer control unit that is operated by an air motor and detects an internal pressure of the air motor to control a tightening time. The timer control unit has an internal pressure of the air motor at a predetermined pressure. A torque control function for determining the completion of tightening after a lapse of a certain time has been provided, and the completion of tightening of the lock nut is reliably determined in a short time.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the overall configuration of a valve clearance adjusting apparatus according to an embodiment of the present invention, FIG. 2 shows the detailed status of the essential parts in FIG. 1, FIG. 3 shows the detailed status when adjusting the adjustment screw, and FIG. Shows the detailed situation when tightening the lock nut.
[0014]
As shown in FIG. 1, in a valve train 2 provided in an engine cylinder head 1, an intake (exhaust) valve 3 is opened and closed by a cam 5 via a rocker arm 4. The cam 5 is provided on the camshaft 6, and the rocker arm 4 swings through the cam 5 by the rotation of the camshaft 6. The intake (exhaust) valve 3 is urged in the valve closing direction (upward in the figure) by the valve spring 7, and the intake (exhaust) valve 3 is driven to open against the spring force of the valve spring 7 by swinging of the rocker arm 4. Then, the intake port (exhaust port) 8 is opened.
[0015]
An adjusting screw 11 for adjusting the valve clearance is provided between the upper end of the stem 9 of the intake (exhaust) valve 3 and the rocker arm 4, and the rocker arm 4 swings via the adjust screw 11. It is transmitted to. The adjustment screw 11 is adjusted to a predetermined state and the position is fixed by a lock nut 12. By adjusting the adjustment screw 11, the intake (exhaust) valve 3 is opened and closed by a predetermined lift amount.
[0016]
Adjustment of the adjusting screw 11 and tightening of the lock nut 12 are performed by the valve clearance adjusting device 10. The valve clearance adjusting device 10 will be described.
[0017]
The valve clearance adjusting device 10 includes an adjusting screw rotating mechanism 13 that adjusts the adjusting screw 11 and a lock nut tightening mechanism 14 that tightens the lock nut 12. That is, the adjusting screw rotating mechanism 13 includes a bit 15 as a tool having a tip portion (for example, a hexagonal hole or a plus driver tool) that can be fitted to the upper end of the adjusting screw 11, and the bit 15 is used as a tool actuator. It is rotationally driven by a tool air motor 16. The lock nut tightening mechanism 14 includes a socket 17 that can be fitted to the lock nut 12, and the socket 17 is rotationally driven by a socket air motor 18 as a socket actuator. The rotation axes of the tool air motor 16 and the socket air motor 18 are arranged in parallel independent axes.
[0018]
A tool air motor 16 is accommodated in the main body 21 of the adjusting screw rotating mechanism 13, and a bit 15 (tool rotating shaft) is attached to the distal end side of the drive rod 22 of the tool air motor 16. The drive rod 22 is movable in the axial direction. When the drive rod 22 moves upward in FIG. 1, the throttle ball 23 of the air reservoir 20 is pushed up and the drive air is supplied to the tool air motor 16. Between the drive rod 22 and the bit 15, a clutch 24 as a torque adjustment mechanism that adjusts the rotation of the bit 15 (rotation axis of the tool) to a predetermined low torque regardless of the pressure of the drive air (torque on the drive source side). Is provided. The bit 15 is rotated at a predetermined low torque through the clutch 24 by driving the tool air motor 16.
[0019]
By providing the clutch 24, the bit 15 is adjusted to a desired low torque regardless of the driving air pressure, and the tightening torque of the adjusting screw 11 is adjusted to a thickness gauge 19 sandwiched between the cam 5 and the rocker arm 4. It can be controlled to a range that can be extracted. Therefore, there is no restriction on the air source to be applied. The torque adjusting mechanism is not limited to the clutch 24, and various mechanisms can be applied as long as the rotating shaft of the tool can be adjusted to a predetermined low torque.
[0020]
A gear box 31 through which the bit 15 passes is provided at the lower portion of the main body 21, and the socket 17 is rotatably supported in the gear box 31 in a state of being coaxial with the bit 15. A main body 32 of the lock nut tightening mechanism 14 is provided on the other end side of the gear box 31, and the socket air motor 18 is accommodated in the main body 32. The driving force of the socket air motor 18 is transmitted in an intermittent state (striking type) to the driving gear 34 in the gear box 31 via the pulse portion 33. In the no-load state, the rotation is constant. A driven gear 35 is fixed to the outer periphery of the upper portion of the socket 17, and the driving force from the driving gear 34 is transmitted to the driven gear 35 via the intermediate gear 36. By driving the socket air motor 18, the socket 17 is rotated in an intermittent state via the pulse portion 33, the drive gear 34, the intermediate gear 36 and the driven gear 35.
[0021]
The rotary axes of the tool air motor 16 and the socket air motor 18 are arranged as parallel independent axes, and the driving force of the socket air motor 18 is output in an intermittent state (constant rotation in the no-load state) via the pulse unit 33 to hit the socket 17. Since the impact wrench of the mold is used, a rotational reaction force when the socket 17 is tightened can be received by the valve clearance adjusting device 10 and is not transmitted to the operator side.
[0022]
On the other hand, the adjusting screw rotating mechanism 13 includes a brake mechanism 25 that applies a braking force to the rotating shaft of the bit 15. That is, a brake plate 27 is provided on the rotary shaft 26 below the clutch 24 so as to be non-rotatable and movable in the axial direction. The brake plate 27 is pressed against the brake base 28 by air, so The force is applied and the rotation of the bit 15 stops. As a result, the bit 15 does not rotate together when the socket 17 is tightened and rotated.
[0023]
An air supply circuit to the tool air motor 16, the socket air motor 18, and the brake mechanism 25 will be described.
[0024]
Air from the air source is sent from the first flow path 42 to the air reservoir 20 of the adjusting screw rotating mechanism 13 via the solenoid valve 41. A second flow path 43 is provided by branching from the first flow path 42, and a throttle valve 44 is provided in the second flow path 43. Air is sent from the second flow path 43 to the socket air motor 18 by the operation of the throttle valve 44. A third flow path 45 is branched from the second flow path 43 on the downstream side of the throttle valve 44, and air is sent from the third flow path 45 to the brake mechanism 25 in conjunction with the operation of the throttle valve 44. (Control means).
[0025]
The throttle valve 44 is actuated by operating the handle lever 46 by the operator. That is, after adjusting the adjustment screw 11 by rotating the bit 15 by driving the tool air motor 16, the operator operates the handle lever 46 to operate the throttle valve 44, so that the socket air motor 18 and the brake mechanism 25 are also air-operated. Is to be sent.
[0026]
The internal pressure of the socket air motor 18 is detected by the pressure sensor 29, and the detection information of the pressure sensor 29 is sent to the timer control means 30. The timer control means 30 has a function of stopping the supply of air by turning off the solenoid valve 41 after a predetermined time has elapsed after the internal pressure of the socket air motor 18 reaches a predetermined pressure. That is, after a predetermined time has elapsed after the internal pressure of the socket air motor 18 reaches a predetermined pressure, the completion of tightening of the lock nut 12 is determined and the supply of air is stopped. At this time, it is possible to output a signal indicating completion of tightening of the lock nut 12. For this reason, the completion of the tightening of the lock nut 12 can be reliably determined in a short time.
[0027]
In addition to the function for managing the completion of tightening, the timer control means 30 is provided with a function for managing the number of times that the lock nut 12 has been tightened, that is, a function for managing the adjusted number, and displaying a predetermined number of adjustments (tightening). It is possible to output a signal to perform. Further, when the end state of the work is detected by moving the valve clearance adjusting device 10 before the predetermined number of tightenings are finished, a signal indicating that can be output. .
[0028]
The detail of the principal part of the valve clearance adjustment apparatus 10 is demonstrated based on FIG.
[0029]
As shown in FIG. 2, the rotating shaft 26 is fixed to the output side of the clutch 24, and the bit 15 is attached to the lower portion of the rotating shaft 26. That is, the rotating shaft 26 functions as a bit holder, and a hollow portion 51 having a lower end opened is formed on the lower side of the rotating shaft 26. A pair of long holes 52 extending in the vertical direction are formed in the side portion of the hollow portion 51. A pin 53 is engaged and provided at the upper end of the bit 15, and the pin 15 is slidably fitted into the long hole 52, so that the bit 15 is supported below the rotary shaft 26. A compression spring 54 is provided in the hollow portion 51, and the bit 15 is biased downward in the hollow portion 51.
[0030]
A brake plate 27 is supported on the upper portion 55 of the rotating shaft 26 so as not to rotate but to be movable in the axial direction. That is, the upper portion 55 has a hexagonal column shape, and the mounting holes for the brake plate 27 are hexagonal. The brake plate 27 is biased upward by the compression spring 56, and the upper surface of the brake plate 27 is in contact with the brake piston 57. A brake base 28 that is opposed to the lower surface of the brake plate 27 is fixed to the gear box 31 side, and a number of grooves are formed on the upper surface of the brake base 28. A groove is also formed on the lower surface of the brake plate 27 facing the brake base 28.
[0031]
The third flow path 45 is opened at the upper part of the brake piston 57, and air is supplied to the upper part of the brake piston 57, so that the brake piston 57 moves downward. When the brake plate 57 moves downward against the urging force of the compression spring 56 due to the movement of the brake piston 57, the grooves engage with each other to prevent the rotation of the brake plate 27, that is, the rotation of the rotating shaft 26, thereby preventing the brake. Force is applied.
[0032]
In addition, the structure which supports the brake plate 27 so that it cannot rotate with respect to the rotating shaft 55 and is movable in the axial direction is not limited to the hexagonal fitting, but may be other shapes such as a spline fitting. is there.
[0033]
On the other hand, an opening 47 is formed in the upper part of the socket 17. When replacing the bit 15, the bit 15 is moved upward in the hollow portion 51 against the spring force of the compression spring 54, and the pin 53 is removed through the opening 47, thereby removing the bit 15 from the rotating shaft 26. be able to. When attaching a new bit 15, the new bit 15 can be attached to the rotating shaft 26 by moving the new bit 15 upward in the hollow portion 51 and inserting the pin 53 through the opening 47.
[0034]
The valve clearance adjusting device 10 described above is suspended above the engine assembly line, and is used by an operator by pulling it down at the time of adjustment work. As shown in FIG. 1, the solenoid valve 41 is in a state where air is supplied to the first flow path 42, and the throttle valve 42 is in a state where supply of air is stopped. In this state, when the bit 15 is pressed against the adjustment screw and the drive rod 22 of the tool air motor 16 moves upward, the throttle ball 23 of the air reservoir 20 is pushed up and the tool air motor 16 is driven.
[0035]
By operating the handle lever 46 in this state, the throttle valve 42 is switched and air is supplied to the second flow path 43 and the third flow path 45. When a command is output to the solenoid valve 41 by the timer control means 30, the solenoid valve 41 is switched and the supply of air to the first flow path 42 is stopped. For example, when the operator returns the handle lever 46, the solenoid valve 41 and the throttle valve 42 are returned to the original state (the state shown in FIG. 1).
[0036]
Specific adjustment by the valve clearance adjusting device 10 will be described with reference to FIGS. 1, 3, and 4.
[0037]
As shown in FIG. 3, when the thickness gauge 19 is inserted between the cam 5 and the rocker arm 4 and the operator pulls down the valve clearance adjusting device 10 and presses the bit 15 against the upper end of the adjustment screw 11, the bit 15 The hollow portion 51 of the rotating shaft 26 is moved against the spring force of the compression spring 54, and the pin 53 comes into contact with the upper end of the long hole 52. Further, when the bit 15 is pressed, the drive rod 22 moves upward through the rotating shaft 26, the throttle ball 23 of the air reservoir 20 is pushed up, and the tool air motor 16 is driven. When the tool air motor 16 is driven, the bit 15 rotates, the adjustment screw 11 is driven, the rocker arm 4 is pulled up, and the valve clearance is adjusted to a predetermined state. When the distance between the cam 5 and the rocker arm 4 is the thickness gauge 19, the operator operates the handle lever 46 and pulls out the thickness gauge 19 after the lock nut 12 is tightened.
[0038]
By operating the handle lever 46, the throttle valve 44 is switched, and air is supplied to the second flow path 43 and the third flow path 45. As the air is supplied to the second flow path 43, the socket air motor 18 is driven. As shown in FIG. 4, the socket air motor 18 is driven to drive the pulse portion 33, the drive gear 34, the intermediate gear 36, and the driven gear 35. Thus, the socket 17 is intermittently rotated (constant rotation in the no-load state). The lock nut 12 is tightened by the rotation of the socket 17 and the position of the adjustment screw 11 is fixed.
[0039]
At the same time, as air is supplied to the third flow path 45, as shown in FIG. 4, air acts on the upper part of the brake piston 57 and the brake piston 57 moves downward. As the brake piston 57 moves, the brake plate 27 moves downward against the urging force of the compression spring 56, and the grooves of the brake plate 27 and the brake base 28 engage with each other to rotate the brake plate 27, that is, rotate. The rotation of the shaft 26 is prevented. For this reason, when the lock nut 12 is tightened, the bit 15 is prevented from rotating. At this time, a driving force is applied to the bit 15, but the driving force of the bit 15 is a low-torque driving force via the clutch 24, so that the operation of the brake mechanism 25 is not affected.
[0040]
When the lock nut 12 is tightened by driving the socket air motor 18 and a predetermined tightening force is obtained, the internal pressure of the socket air motor 18 rises and the pressure sensor 29 detects that the predetermined internal pressure is reached. Information detected by the pressure sensor 29 is sent to the timer control means 30, and a command to turn off the solenoid valve 41 is output from the timer control means 30 after a predetermined time has elapsed after the internal pressure of the socket air motor 18 reaches a predetermined pressure. . When the solenoid valve 41 is turned off, the supply of air is stopped and the tightening of the lock nut 12 is completed. At this time, for example, completion of tightening of the lock nut 12 is displayed by lighting of a lamp or the like.
[0041]
After the valve clearance adjustment of one intake (exhaust) valve 3 is completed, the valve clearance adjustment device 10 is moved to the position of the next intake (exhaust) valve 3. At this time, when the operator returns the handle lever 46, the solenoid valve 41 and the throttle valve 42 are returned to the original state (the state shown in FIG. 1). When the adjustment of the valve clearance of all intake (exhaust) valves 3 for one engine is completed and the operator returns the valve clearance adjustment device 10 upward, all adjustments are completed by detection of a proximity switch (not shown). Is displayed.
[0042]
Since the timer control means 30 has a function of managing the number of times that the lock nut 12 has been tightened, that is, the adjusted number, the adjustment of all the intake (exhaust) valves 3 for one engine is completed. The type of display can be made different depending on whether or not it is done. That is, when the completion state of the work is detected by moving the valve clearance adjusting device 10 before the adjustment of all the intake (exhaust) valves 3 for one engine is completed, all the adjustments are completed. Not displayed.
[0043]
In the valve clearance adjusting device 10 described above, the rotating shafts of the tool air motor 16 and the socket air motor 18 are arranged as parallel independent shafts, and the driving force of the socket air motor 18 is intermittently transmitted through the pulse portion 33 (a constant rotation in the no-load state). ) And the socket 17 is used as an impact-type impact wrench, so that the rotational reaction force when the socket 17 is tightened can be received by the valve clearance adjusting device 10 and the burden on the operator can be reduced. .
[0044]
Further, since the adjusting screw rotating mechanism 13 is provided with the brake mechanism 25 that causes the brake force to act on the rotating shaft of the bit 15 when the socket air motor 18 is driven, the braking force is applied to the rotation of the rotating shaft 26 when the socket 17 is tightened. Is added to stop the rotation of the bit 15. Thereby, the bit 15 does not rotate together during the tightening rotation of the socket 17, and the valve clearance adjustment accuracy can be improved.
[0045]
Further, since only the adjustment screw 11 is rotated and adjusted first, and then the adjustment screw 11 is stopped and the lock nut 12 is tightened, the lock nut 12 is fixed from the seat surface before adjusting the clearance. If the dimensions are different, adjustment with the adjusting screw 11 is possible regardless of the positional relationship between the two.
[0046]
Further, the timer control means 30 determines the completion of tightening of the lock nut 12 after a predetermined time has elapsed after the internal pressure of the socket air motor 18 reaches a predetermined pressure, and stops the supply of air. The judgment can be made reliably in a short time, and the valve clearance can be adjusted in a short time even for those other than skilled workers, thereby reducing the number of man-hours. Moreover, since it is a manual type air tool, it has a simple structure, can be installed in a small space, and can be easily adapted to many models.
[0047]
Therefore, it is possible to provide a valve clearance adjustment device 10 that can adjust the adjustment screw 11 reliably without using a complicated mechanism and without the rotation of the adjustment screw 11 and the lock nut 12.
[0048]
In the above-described embodiment, an example of an overhead shaft type configuration in which the camshaft is disposed at the upper portion of the engine and the rocker arm is directly swung by the cam has been described as an example. However, the camshaft is disposed at the lower portion of the engine. The present invention is also applicable to an engine that is arranged and rocks a rocker arm via a push rod. In this case, the thickness gauge is inserted between the upper end of the valve stem and the rocker arm, and the position of the adjustment screw is adjusted between the upper end of the push rod.
[0049]
【The invention's effect】
  According to a first aspect of the present invention, there is provided an adjustment screw rotating mechanism including a tool having a tip that can be fitted to an adjustment screw and a tool actuator capable of rotating the tool, and a socket that can be fitted to a lock nut. A lock nut tightening mechanism including a socket actuator that can rotate the socket and a brake plate that is non-rotatably attached to the rotating shaft of the tool in the axial direction.MoveThe brake plate andLock nut tightening mechanismA brake mechanism that applies a braking force to the rotary shaft of the tool by engaging grooves with a brake base fixed to the brake base, and a control means that operates the brake mechanism in conjunction with the tightening operation of the lock nut tightening mechanism Therefore, when tightening the lock nut, the adjustment screw can be prevented from rotating, and the adjustment of the valve clearance can be performed without the co-rotation of the adjustment screw and the lock nut.
[0051]
  Claim 2In the present invention, the rotation axis of the tool actuator and the rotation axis of the socket actuator are arranged as parallel independent axes so that the reaction force is received by the apparatus itself when the lock nut is tightened, so that the burden on the operator is reduced. Can be planned.
[0052]
  Claim 3According to the present invention, the lock nut tightening mechanism is provided with a timer control unit that is operated by an air motor and detects an internal pressure of the air motor to control a tightening time. The timer control unit has an internal pressure of the air motor at a predetermined pressure. The torque control function that determines the completion of tightening after a certain period of time has been provided, so that the completion of lock nut tightening can be determined reliably in a short time, and valve clearance can be adjusted in a short time even for non-skilled workers. It is.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a valve clearance adjusting device according to an embodiment of the present invention.
FIG. 2 is a detailed view of a main part in FIG.
FIG. 3 is a detailed view when adjusting the adjustment screw.
FIG. 4 is a detailed view when the lock nut is tightened.
[Explanation of symbols]
    1 Cylinder head
    2 Valve system
    3 Intake (exhaust) valve
    4 Rocker arm
    5 cams
    6 Camshaft
    7 Valve spring
    8 Intake port (exhaust port)
    9 stem
  10 Valve clearance adjustment device
  11 Adjustment screw
  12 Lock nut
  13 Adjustment screw rotation mechanism
  14Lock nut tightening mechanism
  15 bits
  16 Tool air motor
  17 Socket
  18 Socket air motor
  19 Thickness gauge
  20 Air pool
  21, 32 body
  22 Driving rod
  23 Throttle ball
  24 clutch
  25 Brake mechanism
  26 Rotating shaft
  27 Brake plate
  28 Brake base
  29 Pressure sensor
  30 Timer control means
  31 Gearbox
  33 Pulse part
  34 Drive gear
  35 Driven gear
  36 Intermediate gear
  41 Solenoid valve
  44 Throttle valve
  46 Handle lever
  57 Brake piston

Claims (3)

In a valve clearance adjustment device for an engine valve system comprising an intake / exhaust valve, a cam for driving the intake / exhaust valve, an adjustment screw for adjusting the valve clearance, and a lock nut for locking the position of the adjustment screw,
An adjustment screw rotation mechanism including a tool having a tip portion that can be fitted to the adjustment screw and a tool actuator capable of rotating the tool;
A lock nut tightening mechanism comprising a socket that can be fitted to the lock nut and a socket actuator capable of rotating the socket;
Rotating the tool by moving a brake plate, which is non-rotatably attached to the rotation shaft of the tool, in the axial direction and engaging grooves between the brake plate and a brake base fixed to the lock nut tightening mechanism. A brake mechanism that applies a braking force to the shaft;
And a control means for operating the brake mechanism in conjunction with a tightening operation of the lock nut tightening mechanism. In claim 1,
The valve clearance adjusting device for an engine valve operating system, wherein the rotating shaft of the tool actuator and the rotating shaft of the socket actuator are arranged in parallel. In claim 1 or claim 2,
The lock nut tightening mechanism includes a timer control unit that operates by an air motor and detects an internal pressure of the air motor to control a tightening time.
The timer control means is provided with a torque control function for determining completion of tightening after a predetermined time has elapsed since the internal pressure of the air motor becomes a predetermined pressure.

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