JP2002089663A - Mounting structure of control cam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control cam mounting structure of such a configuration that a control cam furnished with a pointer or graduations and a reference member are arranged in non-restrained condition in the rotating direction with respect to a cam shaft whereby the control cam mounting phase with respect to the cam shaft is made adjustable without allowing the reference member to turn together. SOLUTION: Rotation of the cam shaft 2 is transmitted from a pair of washers 20... in the condition restrained at the cam shaft 2 about the rotating direction to limit switch cams (control cam) 3 and 4 installed in the non- restrained condition so that switches 5 and 6 are actuated for controlling any member to be controlled. The mounting phases of control cams 3 and 4 with respect to the cam shaft 2 are varied through relative sliding with the washers 20.... Dials 53 and 56 as reference members installed in the non-restrained condition from the cam shaft 2 are separated by the washer 20 from the control cam and will not turn together with the control cams 3 and 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control cam, such as a cam for controlling the operation of a controlled member by actuating a switch, the phase of attachment of the control cam to a cam shaft being adjustable by visual observation. Mounting structure.

[0002]

2. Description of the Related Art At present, valves for opening and closing flow paths are mounted on gates, sluice gates, and the like in order to control the flow of fluids in water channels, water purification plants, power plants, and the like. With respect to a valve driving actuator device provided in a flow path for opening and closing a valve, a central information system in which a controller is used to control a valve from a manual operation has been started. The valve drive actuator device, which performs the diagnosis of the valve drive actuator device itself by transferring data to a host computer, requires large-scale equipment.If there is an abnormality in the valve drive actuator, go to the site to perform inspection and repair However, the repair and inspection work is expensive, and the maintenance cost is high, which is not preferable. In general, the valve controller itself has almost no check function, and the user goes to the place where the valve drive actuator is installed and checks regularly, and the check itself is also inaccurate. However, there is a problem that the inspection cost increases.

[0003] Therefore, the valve drive shaft itself or an axis related to the valve drive shaft is a cam shaft that rotates at a rotation angle corresponding to the opening degree of the valve, and the valve is opened and closed by a control cam that operates based on the rotation angle of the cam shaft. Control has been done. That is,
The rotation angle of the control cam corresponds to the opening of the valve, and the control cam that rotates in accordance with the opening of the valve operates a switch to control the opening and closing of the valve according to the opening of the valve. A plurality of control cams are provided on the camshaft, and can operate in accordance with the rotation angle of the camshaft to finely operate the actuator. In order to adjust the operation timing and the like for each actuator for each valve drive device, each control cam is configured to be capable of manually adjusting the position of attachment to the camshaft.

Further, regarding opening and closing of the valve, in particular, in order to avoid applying an excessive torque that may damage the valve to the valve drive shaft, or to open and close the valve against the resistance of the fluid,
It is necessary to control according to the magnitude of the torque applied to the valve drive shaft. Therefore, in addition to the camshaft for valve opening that rotates at a rotation angle corresponding to the opening of the valve, a camshaft for torque that converts torque applied to the valve drive shaft into a rotation angle is provided. The torque camshaft is provided with a control cam having a profile on a peripheral surface for operating a switch according to a predetermined rotation amount, and the control cam that rotates according to the magnitude of torque applied to the valve drive shaft is switched. The opening / closing operation of the valve is controlled in accordance with the torque by operating.

With respect to the above-mentioned controlled member such as a valve for opening and closing a flow path, a control amount such as a valve opening and a torque applied to a valve drive shaft is converted into a rotation angle of a cam shaft. A control cam having a predetermined profile on the peripheral surface is provided, and a switch provided near the camshaft is operated by a cam action of the control cam that rotates with the rotation of the camshaft. In controlling the controlled member such as torque control, the switch is operated at a predetermined opening degree and torque, and the operation timing of the switch is controlled by the mode of the controlled member such as the type and specification of the on-off valve. It is required that the mounting phase of the control cam to the camshaft be set so as to be adjustable so that the control cam can be changed according to the following conditions.

FIG. 5 is a side view showing a conventional mounting structure of a control cam which makes it possible to adjust the mounting phase. As shown in FIG. 5, a control cam mounting structure 100 is linked to a predetermined valve drive shaft, and is a cam shaft 101 that rotates at a rotation angle corresponding to the valve opening, and a control disposed on the cam shaft 101. The cam 102 includes a set screw 103 screwed into a screw hole 102a formed in the control cam 102. The set screw 103 is screwed into the control cam 102, and the tip of the set screw 103 is pressed against the cam shaft 101. At the same time, the control cam 102 is fastened to the camshaft 101 by the reaction, whereby the control cam 102 is mounted on the camshaft 101. By loosening the set screw 103 once, adjusting the phase of the control cam 102 and then tightening the set screw 103 again, the control cam 1
02 is mounted on the camshaft 101 in a new mounting phase.

In the conventional cam mechanism 100, in order to mount the control cam 102 on the cam shaft 101, it is necessary to strongly press the set screw 103 against the cam shaft 101. Therefore, the cam shaft 10 into which the tip of the set screw 103 bites
Indentations remained on the peripheral surface of No. 1. When the timing of the cam action of the control cam 102 is changed later, the control cam 1
Although it is necessary to change the mounting angle of the control cam 102 with respect to the camshaft 101, indentations remaining on the camshaft 101 may hinder the smooth rotation of the control cam 102. Control cam 1
When the 02 is mounted at a new angle changed with respect to the camshaft 101, there is a problem that the contact position of the set screw 103 with the camshaft is displaced by the indentation left on the peripheral surface of the camshaft 101, making it difficult to perform positioning and fine adjustment thereof. There are points. The drive torque for opening and closing the valve is converted to the rotation angle of the camshaft,
A similar problem arises when performing torque control according to the magnitude of the torque when opening and closing the valve.

Incidentally, in order to know the phase of the control cam with respect to the cam shaft, the relative angle between the control cam or the cam shaft is visually confirmed with a pointer and a dial. For example, the pointer is provided on the control cam, and the dial is mounted on the cam shaft so as to be relatively non-rotatable, and the dial value indicated by the pointer is measured visually. However, in order to attach the dial to the camshaft so that it cannot rotate relative to the camshaft, it is necessary to use a non-rotating structure, which complicates the structure of the dial and complicates assembly of the dial to the camshaft. There is. The camshaft rotates in the forward direction (the direction in which the valve opens) and in the reverse direction (the direction in which the valve closes).
In order to cope with the rotation in both directions, the dial provided with the scale in the forward rotation direction and the scale in the reverse rotation direction of the cam shaft is a common dial. With the common dial, it is not possible to set the scale in the forward rotation direction and the scale in the reverse rotation direction individually, and the setting of the valve opening scale or torque scale in the forward rotation direction and the reverse rotation direction is not possible. It has become difficult.

[0009]

Therefore, the control amount of the controlled member, such as the opening degree of a valve for opening and closing the flow path or the rotational torque transmitted to the drive shaft of the valve, is converted to the magnitude of the control amount. A cam shaft that rotates at a corresponding rotation angle, and has a predetermined cam profile on a peripheral surface for controlling the driving of the controlled member that is arranged near the cam shaft and is rotated with the rotation of the cam shaft. A control cam, wherein the control cam and the reference member provided on the camshaft are provided with hands or scales, respectively. The control cam is rotatable by transmitting the rotation of the camshaft by frictional force so as to rotate the control cam, but the angular position of the reference member does not rotate with the reference member. Control cam based on There are problems to be solved mounting phase in that adjustable individually relative to the cam shaft.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus for controlling the opening degree of a controlled member such as a valve for opening and closing a flow path or the rotational torque transmitted to the controlled member. A camshaft that rotates at a rotation angle corresponding to the control amount of the controlled member such as the size has a predetermined cam profile on the peripheral surface and is based on a cam action when rotating with the rotation of the camshaft. In a cam mounting structure for mounting a control cam for controlling the operation of a controlled member, a simple structure without visually rotating the mounting phase of the control cam with respect to a reference member provided on a cam shaft without rotating the reference member Accordingly, an object of the present invention is to provide a control cam mounting structure in which the control cam can be rotated with respect to the cam shaft to easily change the timing of the cam operation.

[0011] The present invention has been made in order to solve the above problems.
It is configured as follows. That is, the present invention provides a camshaft that is rotated at a rotation angle corresponding to the magnitude of the control amount by converting the control amount of the controlled member, and that has a predetermined cam profile on the peripheral surface and rotates the camshaft. A control cam for controlling the driving of the controlled member based on a cam action when rotating with the control cam, and a reference indicating a mounting phase of the control cam set with respect to the control cam and the cam shaft. A member is fitted to the camshaft in a non-restricted state in the rotation direction, and the control shaft is sandwiched in the camshaft in the axial direction and one of the members is sandwiched between the control cam and the reference member. The two control washers are disposed in a rotationally constrained state and transmit the rotation of the camshaft to the control cam through a frictional force acting between the two control washers. And the reference member A spring that presses the spring is provided so that its spring force can be adjusted, and the mounting phase of the control cam that is mounted on the cam shaft with the spring force reduced can be adjusted without rotating the reference member. And a control cam mounting structure.

The control cam mounting structure according to the present invention comprises:
With the above configuration, the rotation of the camshaft representing the control amount of the controlled member is directly transmitted to the two washers that are constrained in the rotation direction by the camshaft. The control cam is rotated by a frictional force generated based on a spring force applied to both washers by a spring, and controls the driving of the controlled member based on a predetermined cam profile on the peripheral surface.
At this time, the reference member also rotates together with the control cam due to the frictional force acting between the reference member and one of the washers. In order to change the drive timing of the controlled member according to the specifications, etc., when changing the mounting phase of the control cam with respect to the camshaft, when the spring force is weakened, for example, when the rotation angle of the camshaft is zero, An operator rotates the control cam around the cam shaft by using an appropriate tool. Since the control cam itself is disposed in a non-restricted state with respect to the camshaft, the mounting phase around the camshaft can be changed by sliding the control cam relative to both washers. At this time, the reference member is
Even if the control cam is not restrained with respect to the camshaft, it is not separated from the control cam by one washer, so that it is not accompanied with the control cam. Therefore, the control cam can visually adjust the relative rotation amount with respect to the reference member which is stationary together with the cam shaft, that is, the mounting phase with respect to the cam shaft.

In this control cam mounting structure, the control amount of the controlled member is a moving amount of the controlled member or a rotational torque transmitted to the controlled member. As the movement amount of the controlled member, for example, the opening degree of a valve can be considered. The rotational torque transmitted to the controlled member is, for example, a torque that is driven to open and close the valve. The timing at which the control cam operates can be changed according to the amount of movement of the controlled member and the magnitude of the rotational torque.

The control cam mounting structure is provided in each of two sets, a set for the forward rotation direction and a set for the reverse rotation direction. The set of the mounting structure consisting of the control cam, the reference member and the washer is provided separately in the normal rotation direction and the reverse rotation direction in relation to the cam shaft, so that the control amount of the controlled member can be controlled in any rotation direction. Control and
The setting of the mounting phase with respect to the camshaft can be performed individually.

The two sets are arranged in a point-symmetrical state with the two reference members opposed to a plane perpendicular to the axis of the camshaft. A washer is pinched in the rotation direction of the camshaft in a restricted state. That is, the two sets of the control cam, the reference member, and the washer are arranged point-symmetrically in the axial direction, and are provided separately from the set for the forward rotation direction and the set for the reverse rotation direction. I have. Due to the simple structure in which another washer is interposed between the two reference members, the mounting structure is reduced in size and the mutual rotation of the two reference members is prevented.

In this control cam mounting structure, the pointer is formed integrally with the control cam, and the reference member is a dial with a scale. The control cam is a scaled control cam with a scale,
The pointer is formed integrally with the reference member.
The mounting phase of the control cam is set while visually checking based on a dial with a scale indicated by a pointer.

A lock mechanism capable of changing the frictional force between the control cam and the washer by changing the magnitude of the pressing force of the spring is provided, and the locking mechanism reduces the pressing force. Sometimes, the rotation of the control cam with respect to the cam shaft is allowed to change the mounting phase of the control cam with respect to the cam shaft, and the control is performed with the changed mounting phase by increasing the pressing force. The cam can be locked to the camshaft.

The lock mechanism has a first slope inclined with respect to the axis of the camshaft, and a first lock member displaceable in a radial direction of the camshaft, and abuts against the first slope of the first lock member. A second lock member having a second inclined surface that is in contact with the cam shaft and being displaceable in the axial direction of the camshaft; and displacing the first lock member in the radial direction to move the first inclined surface and the second inclined surface. The pressing force of the spring is changed by changing the axial length of the lock mechanism by displacing the second lock member in the axial direction by the slope action.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a control cam mounting structure according to the present invention will be described below with reference to the drawings. FIG.
2 is a side view showing an embodiment of a control cam mounting structure according to the present invention, FIG. 2 is a plan view of the control cam mounting structure shown in FIG. 1, and FIG. FIG. 4 is a sectional view showing a fitting structure with a washer, and FIG. 4 is an explanatory view showing a drive mechanism for obtaining a rotation angle in proportion to a drive torque on the cam shaft.

The control cam mounting structure 1 shown in FIG. 1 is a structure in which a control cam for controlling the operation of the valve driving mechanism is mounted on a cam shaft 2 which rotates in relation to the valve driving mechanism.
The valve (not shown) is a 90-degree valve such as a butterfly valve or a ball valve that opens and closes a water channel, and the camshaft 2 acts on a valve drive shaft that is rotated to open and close the valve. This axis rotates at a rotation angle proportional to the magnitude of the torque. In order to rotate the camshaft 2 at a rotation angle proportional to the magnitude of the torque applied to the valve drive shaft, a drive mechanism 70 for opening and closing the valve is provided as shown in FIG.

The drive mechanism 70 includes a motor 71 having an output shaft 72 and supported in a housing 90,
A first intermediate shaft 73 including a first large gear 74 and a first small gear 75 concentric with the first large gear 74 that are rotatably supported therein and mesh with gears formed at the end of the output shaft 72;
The first small gear 7 is rotatably supported in parallel with the first intermediate shaft 73.
5, a second intermediate shaft 76 provided with a second large gear 77 and a second small gear 78 concentric with the second large gear 77, and a second intermediate gear 76 supported in the housing 90 in parallel with the first intermediate shaft 73. A worm shaft 79 having a gear 80 meshing with the two small gears 78 is provided. The output rotation of the motor 71 is controlled by the output shaft 7.
2 to the first large gear 74, the first small gear 75, the second large gear 7
7, the second small gear 78 and the worm shaft 7 through the gear 80.
9 and is transmitted at greatly reduced speed. The second intermediate shaft 76 is
One shaft end is supported in a handle shaft 92 provided on the handle 91. Since the handle shaft 92 can be selectively disengaged from the second intermediate shaft 76 via the clutch 93,
When the motor 71 is out of order, the worm shaft 79 can be driven by the handle 91.

The drive mechanism 70 further includes a worm 82 that meshes with teeth 81 formed on the worm shaft 79, and the controlled member such as a valve can be opened and closed by rotating the worm 82. Worm shaft 79
Is axially urged by an axial spring 83 provided between the pair of angular bearings 84, 84. When torque is transmitted between the worm shaft 79 and the worm 82,
The worm shaft 79 is displaced in the axial direction in proportion to the magnitude of the transmission torque against the axial spring 83, and the axial displacement proportional to the torque is applied to the rack 8 formed on the worm shaft 79.
The rotation angle of the pinion 87 is converted by a conversion mechanism including the pinion 6 and the pinion 87 meshing with the rack 86. The rotation of the pinion 87 is transmitted to the rotation shaft 50 in FIG. 1 and transmitted to the camshaft 2 via the gear transmission 51.

The limit switch cams 3 and 4 are
Is mounted on the camshaft 2 such that the mounting phase is adjustable so that the cam operates at a predetermined timing according to the rotation of. That is, as shown in FIG. 2, the limit switch cams 3, 4 have cam profiles 13 bulging to predetermined positions on the outer peripheral surface 12, and are used for forward rotation and reverse rotation, respectively. Of the control cam. When the camshaft 2 is driven to rotate in accordance with the magnitude of the torque for driving the valve when the valve is opened and closed, the switches 5 and 6 are operated at a predetermined angle phase with respect to each of the limit switch cams 3 and 4. . Switches 5, 6
Is controlled in accordance with the rotation angle of the camshaft 2, whereby opening and closing of the valve can be controlled in accordance with the magnitude of the driving torque. The switches 5 and 6 correspond to, for example, the a contact and the b contact of the transistor switch, and the a contact is configured to operate slightly earlier than the b contact. The camshaft 2 is rotatable with respect to the frame 11, but is supported so as to be restricted in the axial direction.

Each of the switches 5 and 6 has a leaf spring 7 attached to a switch body 10 having one end fixed to the frame 11, and a rotation end parallel to the axis of the camshaft 2 at the other end of the leaf spring 7. A roller 9 rotatably supported by a shaft 8. Since the roller 9 can roll while abutting against the outer peripheral surfaces of the limit switch cams 3, 4, the resistance applied when the limit switch cams 3, 4 rotate is extremely small.

As shown in FIG. 3, the cross-sectional shape of the camshaft 2 is such that the arc surfaces 15, 15 which are a part of the same circumferential surface, and the opposite sides in the diametric direction between the arc surfaces 15, 15 are formed. And a flat surface 16 extending in the axial direction at a position facing the front surface. The camshaft 2 is attached to the limit switch cams 3 and 4.
Through which a circular hole 17 having substantially the same diameter as the arcuate surfaces 15
(FIG. 1) is formed. Therefore, the limit switch cams 3 and 4 are placed in an unrestricted state in the axial direction and the circumferential direction with respect to the camshaft 2. The flat surface 16 of the camshaft 2
Reference numeral 16 forms an engagement portion for rotating a washer 20 described later together with the camshaft 2.

In order to prevent the limit switch cams 3, 4 from rotating relative to the camshaft 2, washers 20, 20 are provided to apply a frictional force by sandwiching each of the limit switch cams 3, 4 in the axial direction. I have. Each washer 20 has
An engagement hole 21 formed of an arc portion 22 and a flat portion 23 complementary to the cross-sectional shape of the camshaft 2 shown in FIG. 3 is formed. Therefore, each washer 20 is in an unconstrained state in the axial direction with respect to the camshaft 2 but is in a constrained state in the circumferential direction and cannot rotate relative to the camshaft 2. In order to prevent the mutual operation of the limit switch cams 3 and 4 from interfering with each other and to display the torque scale associated with each of the limit switch cams 3 and 4, the camshaft 2 has a reference member as the reference member in the present invention. Rotation dial 5 for normal rotation and reverse rotation
The limit switch cams 3 and 4 are spaced apart in the axial direction of the camshaft 2 by fitting the dials 53 and 56, respectively.
Details of 56 will be described later. The lower washer 20 provided in association with the lower limit switch cam 4 is
The upper washer 20 that is in contact with the bush 25 attached to the frame 11 and that is provided in connection with the upper limit switch cam 3 is in contact with a spring 26 that is related to a lock mechanism 30 described later.

In this embodiment, the spring 26 is constituted by a disc spring having a hole through which the camshaft 2 penetrates, and is provided on both sides in the axial direction of the camshaft 2 in relation to the limit switch cam 3. And the washer 20 disposed on the lock mechanism 30 side. By urging the four washers 20 and the limit switch cams 3 and 4 toward the bush 25, the limit switch cams 3 and 4 are sandwiched between the washers 20 and 20, respectively. Even if the limit switch cams 3 and 4 attempt to move blindly with respect to the camshaft 2, the washers 20, 20
Such blind movement is prevented by the frictional force generated at the contact surfaces between the limit switch cams 3 and 4. Spring 26
The reaction force of the spring force is supported by the camshaft 2 via a lock mechanism 30 described later.

The lock mechanism 30 is fitted into the camshaft 2 in a U-shape or fitted into the camshaft 2 with a long hole, and can be moved in the radial direction of the camshaft 2; The camshaft 2 is disposed closer to the limit switch cam 3 than the first lock member 31 and acts on the first lock member 31 by a slope.
And a second lock member 32 that is movable in the axial direction. The first lock member 31 is prevented from moving in one axial direction of the camshaft 2 by abutting on the washer 28 regulated by the retaining ring 33 engaged with the camshaft 2. The first lock member 31 includes a first lock member main body 35 having a first inclined surface 38, a screw engaging portion 36 formed integrally with the first lock member main body 35, and a screw engaging portion 36. And a set screw 37 to be combined. The first slope 38 of the first lock member main body 35 is formed on the second lock member 32 side. By screwing in the set screw 37, the tip of the set screw 37 comes into contact with the camshaft 2,
The reaction causes the first lock member 31 to move in the radial direction of the camshaft 2.

The second lock member 32 is formed as a sleeve 40 fitted on the camshaft 2 and is arranged in a restricted state in the radial direction of the camshaft 2 but in an unconstrained state in the axial direction. It is arranged in. A second slope 41 that contacts the first slope 38 is formed on the first lock member 31 side of the sleeve 40, and contacts the washer 27 on the spring 26 side.

In the lock mechanism 30, the set screw 3
When the first lock member 31 is moved in the radial direction of the camshaft 2 by operating the first lock member 7 in the loosening direction, the first slope 38 and the second slope 41 slide with each other based on the action of the slope to lock. The axial length of the mechanism 30 is reduced, and the spring force of the spring 26 is reduced. The clamping force of the washers 20, 20 sandwiching the limit switch cams 3, 4 is also weakened, and the mounting position of the limit switch cams 3, 4 with respect to the cam shaft 2 can be adjusted manually. After adjusting the mounting phase of the limit switch cams 3 and 4 with respect to the camshaft 2, by operating the set screw 37 in the tightening direction, the lock mechanism 30 is operated based on the action of the first slope 38 and the second slope 41. Becomes longer in the axial direction, and the spring 26
And the spring force is strengthened. Therefore, the clamping force of the washers 20, 20 sandwiching the limit switch cams 3, 4 is increased, and the limit switch cams 3, 4 can be locked to the camshaft 2.

The camshaft 2 has limit switch cams 3,
The upper limit switch cam 3 for forward rotation between the four
, A forward rotation dial 53 is provided via the washer 20, and a reverse rotation dial 56 is provided via the washer 20 to the lower reverse rotation limit switch cam 4. The forward rotation dial 53 and the reverse rotation dial 56 have an engagement structure similar to the limit switch cams 3 and 4, and are fitted to the camshaft 2 in a circumferentially non-restricted state. Since the washer 59 is disposed between the forward rotation dial 53 and the reverse rotation dial 56 in a state of being constrained in the circumferential direction with respect to the camshaft 2, the forward rotation dial 53 or the reverse rotation dial 53 is provided. Touching 56 prevents the other from rotating.

The forward rotation limit switch cam 3 is integrally formed with a pointer 55 pointing to a torque scale 54 having a scale formed on the outer peripheral surface of a forward rotation dial 53. Is a torque scale 5 in which a scale is engraved on the outer peripheral surface of the reverse rotation dial 56 in the circumferential direction.
A pointer 58 pointing to 7 is formed integrally. In the illustrated example, the torque scale 54 and the torque scale 57 have the same zero point in the circumferential direction. However, when the hands 55 and 58 point to the torque scales 54 and 57 of the dials 53 and 56, the torque can be visually checked. It is possible.

The limit switch cam 3, which is a control cam,
When it is necessary to adjust the mounting phase of the cam shaft 2 to the cam shaft 2, the lock mechanism 30 is loosened to reduce the spring force of the spring 26. In this state, the worker rotates the limit switch cam 3 or 4 around the cam shaft 2 with reference to the torque scale 54 or 57 of the dial 53 or 56 using an appropriate tool. At this time, the dial 53 or 56 moves along with the limit switch cam 3 or 4 due to the presence of the washer 20 which is in the rotation direction with respect to the camshaft 2 between the dial switch 53 and 56. It does not go around. The dial 53 or 56 is
Also, blinding due to the frictional force acting between them is prevented. When the mounting phase of the limit switch cam 3 or 4 with respect to the camshaft 2 is adjusted, the lock mechanism 30 is operated to increase the spring force of the spring 26, so that the cam is locked to the camshaft 2 in the adjusted phase. State.

As described above, the mounting structure of the control cam, in which the driving torque is converted into the rotation angle of the camshaft 2 according to the magnitude, has been described as an embodiment. Obviously, the present invention can be applied to a mounting structure in which the opening is converted into the rotation angle of the camshaft 2. Also, the mounting structure in which a pair of units including a control cam, a washer, and a dial are provided as a set and a pair of sets 52a and 52b are provided on the camshaft 2 for normal rotation and for reverse rotation has been described. Is the camshaft 2
Can also be incorporated into When a pair of pairs for the forward rotation and the reverse rotation is provided, the pair may be separated not only by the washer 59 but also in the axial direction of the camshaft 2 as appropriate. Furthermore, hands 55, 5 are provided on the limit switch cams 3, 4.
8 and the dial 53 or 56 has a torque scale 54,
57, but conversely, limit switch cam 3,
4 may be provided with a torque scale and the dial 53 or 56 may be provided with a pointer.

[0035]

As described above, the mounting structure of the control cam according to the present invention has the same effect as the opening degree of the controlled member such as the valve for opening and closing the flow path or the magnitude of the rotational torque transmitted to the controlled member. The camshaft that rotates at a rotation angle corresponding to the controlled amount of the controlled member has a predetermined cam profile on the peripheral surface, and the camshaft rotates based on the cam action when the camshaft rotates. In a cam mounting structure for mounting a control cam for controlling an operation, a control cam and a reference member indicating a mounting phase of the control cam set for the cam shaft are fitted to the cam shaft in a rotationally unconstrained state. The camshaft is provided with a pair of washers that sandwich the control cam in the axial direction and abut against the control cam and the reference member while avoiding direct contact between the control cam and the reference member. Friction acting between Since a spring for transmitting the force to the control cam via the force is provided, and the mounting phase of the control cam mounted on the camshaft can be adjusted without rotating the reference member, the control cam for the reference member provided on the camshaft is provided. The mounting phase can be adjusted visually, and the control cam can be rotated with respect to the cam shaft with a simple structure to easily change the cam operation timing without rotating the reference member. it can. Also, since the camshaft can rotate in the forward rotation direction and the reverse rotation direction, the dial provided with the graduations in the normal rotation direction and the reverse rotation direction of the camshaft is a separate dial to support rotation in both directions. So,
The setting of the scale in the forward rotation direction and the setting of the scale in the reverse rotation direction can be individually performed, and the operation timing of the control cam can be easily set.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a control cam mounting structure according to the present invention.

FIG. 2 is a plan view of a control cam mounting structure shown in FIG. 1;

FIG. 3 is a sectional view showing a fitting structure of a cam shaft and a washer in the control cam mounting structure shown in FIG. 1;

FIG. 4 is an explanatory view showing a drive mechanism for obtaining a rotation angle in proportion to a drive torque on the cam shaft.

FIG. 5 is a side view showing a conventional mounting structure of a control cam to a cam shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control cam mounting structure 2 Cam shaft 3, 4 Limit switch cam (control cam) 12 Peripheral surface 13 Cam profile 20 Washer 26 Spring 30 Lock mechanism 31 First lock member 32 Second lock member 38 First slope 41 Second slope 52 Set consisting of control cam, washer and dial 53,56 Dial (reference member) 54,57 Scale 55,58 Pointer 59 Washer 70 Drive mechanism

Claims (8)

[Claims] 1. A camshaft that is rotated at a rotation angle corresponding to a magnitude of the control amount by converting a control amount of a controlled member, and that has a predetermined cam profile on a peripheral surface and is adapted to rotate the camshaft. A control member for controlling the driving of the controlled member based on a cam action when rotating with the control member; and a reference member for indicating a mounting phase of the control cam set with respect to the control cam and the cam shaft. Are fitted to the camshaft in a non-restricted state in the rotation direction, and the control shaft is sandwiched in the camshaft in the axial direction, and one of the two is sandwiched between the control cam and the reference member. The two control washers are arranged in a rotationally constrained state, and transmit the rotation of the camshaft to the control cam through a frictional force acting between the two washers. The reference members A spring for pressing is provided so that its spring force can be adjusted, and the attachment phase of the control cam attached to the cam shaft with the spring force reduced can be adjusted without rotating the reference member. Control cam mounting structure consisting of: 2. The control cam mounting structure according to claim 1, wherein the control amount of the controlled member is a moving amount of the controlled member or a rotational torque transmitted to the controlled member. 3. The control cam according to claim 1, wherein the control cam mounting structure is provided in each of two sets of a set for a forward rotation direction and a set for a reverse rotation direction. Mounting structure. 4. The two sets are arranged in a point-symmetrical state in which the two reference members are opposed to a plane perpendicular to the axis of the camshaft, and between the two reference members, there is a mutual detent. The control cam mounting structure according to claim 3, wherein a washer for the control cam is held in a restricted state in the rotation direction of the cam shaft. 5. The control cam mounting structure according to claim 1, wherein said pointer is formed integrally with said control cam, and said reference member is a dial with a scale. 6. The control cam mounting structure according to claim 1, wherein the control cam is a graduated control cam having a scale, and the pointer is formed integrally with the reference member. . 7. A lock mechanism capable of changing a frictional force between the control cam and the washer by changing a magnitude of a pressing force of the spring is provided, and the lock mechanism reduces the pressing force. When the control phase is reduced, the rotation of the control cam with respect to the cam shaft is allowed to change the mounting phase of the control cam with respect to the cam shaft. By increasing the pressing force, the mounting phase after the change is changed. The control cam mounting structure according to claim 1, further comprising enabling the control cam to be locked to the cam shaft. 8. The lock mechanism has a first slope inclined with respect to the axis of the camshaft and is displaceable in a radial direction of the camshaft, and the first slope of the first lock member. A second lock member having a second slope contacting the camshaft and being displaceable in the axial direction of the camshaft. The first slope and the second slope are displaced in the radial direction by displacing the first lock member. 8. The control according to claim 7, wherein the pressing force of the spring is changed by changing the axial length of the lock mechanism by displacing the second lock member in the axial direction due to the slope action with the spring. Cam mounting structure.