JPH0518484Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention is designed to connect the drive shaft to the middle of the drive shaft that provides reciprocating motion and rotation to the equipment so that the rotational force is not transmitted to the opposite direction of the equipment. Regarding the connecting mechanism.

(Prior art) For example, in a three-way valve that has a cylindrical valve body and switches ports provided in two stages, upper and lower, and requires two stages of pushing and turning, two sets of drive means are required. be. When two sets of conventional drive means are connected, when one drive means is operated, its driving force is transmitted to the other drive means, and this other drive means may be driven in the opposite direction from the output side. In such cases, a clutch is used as a connection mechanism that transmits axial force but not rotational force to connect these two sets of drive means.

(Problems to be Solved by the Invention) However, in this conventional method in which two sets of drive means are connected by a clutch, a separate actuator for actuating the clutch is required, which complicates the mechanism, and also causes failure. There was also the issue of becoming. In addition, the slippage of the clutch may cause the rotation angle to shift and the device may not stop at the specified stop position, or the angle detection mechanism may be forced to move, causing damage or malfunction, resulting in damage to the equipment. .

In addition, wear and tear on the friction parts and connecting parts of the clutch,
Problems arose, such as the need for regular maintenance and inspections due to damage.

(Means for Solving the Problems) The present invention was made to solve these conventional problems, and it does not require a separate actuator like when using a clutch, or the rotation angle of the shaft is misaligned. Moreover, even if two or more drive means using electric, hydraulic, pneumatic, etc. that give reciprocating motion and rotation to the equipment are connected and driven individually, the output shaft of the other drive means will not be reversed. To provide a transmission mechanism that is not rotationally driven from any direction.

The gist is that a reciprocating shaft that can move forward and backward in the axial direction and a rotating shaft that can move forward and backward in the axial direction and that can rotate are arranged in a straight line with their axes aligned, and the shaft end of either the reciprocating shaft or the rotating shaft is A housing is provided for enclosing the thrust bearing attached to the other shaft end, and a pair of thrust receiver stepped portions are provided on both sides of the thrust bearing to hold the thrust bearing by holding casts of approximately 1 mm in diameter. A coupling mechanism that transmits axial force but does not transmit rotational force is characterized in that the reciprocating shaft is disposed around the reciprocating shaft and the inside of the housing, and the thrust bearing and the reciprocating shaft or the housing are slidably formed.

(Function) In the coupling mechanism of the present invention that transmits axial force but not rotational force, the reciprocating shaft that can move forward and backward only in the axial direction and the rotary shaft that can move forward and backward in the axial direction and rotate are aligned. They are arranged in a straight line, and a thrust bearing is attached to one of the shaft ends, and a housing that encloses the thrust bearing is provided at the other shaft end. Further, a stepped thrust bearing part for holding both sides of the thrust bearing is provided around the shaft end and inside the housing, and a gap of approximately 1 mm is provided between the thrust bearing and the stepped thrust bearing part. Also, the thrust bearing and the reciprocating shaft or housing are formed to be slidable.

For example, when the transmission mechanism is used vertically, a reciprocating shaft is provided above the coupling mechanism and a rotating shaft is provided below. A vertical movement means using a screw shaft or the like is connected to the reciprocating shaft, and a rotation means using a spline shaft, a gear with long teeth, etc. is connected to the rotating shaft.

When giving vertical movement to the equipment, the reciprocating shaft is moved up and down by the vertical movement means. When lifting this reciprocating shaft, the lower surface of the thrust bearing is lifted using a stepped thrust receiving section provided around the lower surface of the thrust bearing. As the thrust bearing rises, the upper surface of the thrust bearing contacts and lifts the stepped portion of the housing, causing the entire housing to rise and lift the rotating shaft. In this state, a gap will be created between the thrust bearing stepped part of the reciprocating shaft and the top surface of the thrust bearing, and the thrust bearing stepped part on the top surface of the thrust bearing installed around the housing will be discontinuous, and the rotating shaft Even if it rotates, no rotational force is transmitted to the reciprocating shaft side.

When pushing down the reciprocating shaft, the stepped part of the reciprocating shaft provided around the upper surface of the thrust bearing pushes down the upper surface of the thrust bearing. As the thrust bearing descends, its lower surface comes into contact with the thrust bearing stepped portion of the housing and pushes it down, causing the entire housing to descend and push down the rotating shaft. In this state, there is a gap between the stepped part of the thrust receiver installed around the lower surface of the thrust bearing of the reciprocating shaft and the lower surface of the thrust bearing, so even if the rotary shaft rotates, no rotational force is transmitted to the reciprocating shaft. .

Although this coupling mechanism does not transmit rotational force from the rotary shaft to the reciprocating shaft, it can also be applied to systems in which the reciprocating shaft side rotates independently depending on the usage conditions.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In the embodiment shown in FIGS. 1 and 2, the axis is vertical and a thrust ball bearing is used as the thrust bearing.

The coupling mechanism 1 of the embodiment that transmits axial force but does not transmit rotational force is a cylindrical housing 5 in which a thrust bearing 3 is mounted on the shaft end of a reciprocating shaft 2 and this is provided on the shaft end of a rotating shaft 4. It's inclusive.

The thrust bearing 3 has a rotating ring 6 on the upper side,
The lower side is a fixed ring 7, and the shaft end of the reciprocating shaft 2 has a stepped thrust part 8 that holds the upper surface of the rotating ring 6, and a stepped thrust part 9 that holds the lower surface of the fixed ring 7. It is set up. The distance between the inner surfaces of the stepped thrust receiving part 8 and the stepped thrust receiving part 9 is the height of the thrust bearing 3 plus a gap 10 of 1 mm.

Similarly, inside the housing 5, there is also a thrust bearing stepped part 11 that holds the upper surface of the rotating ring 6 at the same interval as the thrust bearing stepped parts 8 and 9 at the height of the thrust bearing 3, and a fixed ring 7. A stepped thrust receiving portion 12 is provided around the periphery. Moreover, the reciprocating shaft 2
The fitting portions of the housing 5 and the thrust bearing 3 are formed slightly loosely so that they can slide freely relative to each other.

Connection mechanism 1 that transmits this axial force but does not transmit rotational force
When the reciprocating shaft 2 is pulled up, as shown in FIG. 10 is formed and the pulling force F
are the thrust bearing stepped part 9 of the reciprocating shaft 2, the thrust bearing 3, and the thrust bearing stepped part 11 of the housing 5.
will be conveyed in this order. Similarly, the push-down force F' is transmitted to the stepped thrust portion 8 of the reciprocating wheel 2, the thrust bearing 3, and the stepped thrust portion 12 of the housing 5 in this order, as shown in FIG. At this time, since the rotational force of the rotating shaft 4 is edged by the thrust bearing 3 in both cases, the rotational force is transmitted to the reciprocating shaft 2 side whether the reciprocating shaft is pushed down or pulled up. Never.

Connection mechanism 1 that transmits this axial force but does not transmit rotational force
does not require any special switching operation or actuator, has a simple structure, and can be operated reliably.

The usage example shown in FIG. 3 is a valve body 20 in which a cylindrical valve body 20 is used to switch between upper and lower ports 21.
2, and the reciprocating shaft 2 has a threaded part 23.
is provided, and an electric drive means 24 is connected thereto,
Further, a spline portion 25 is provided on the rotating shaft 4, a bevel gear 26 is slidably attached to the spline portion 25, and an electric drive means 27 is connected to the bevel gear 26.

In the figure, 28 is a worm wheel, 29 is a manual handle, and 30 is an electric motor for driving the worm wheel 28. A lever 31 is used to switch the clutch 32 to either the manual handle 29 or the worm wheel 28 side.

The vertical movement of the rotating shaft 4 by the driving means 24 is caused by the valve body 2.
0 is moved up and down, but no axial force is transmitted to the drive means 27 side. Further, although the rotational force by the drive means 27 rotates the valve body 20, the rotational force is not transmitted to the side of the drive means 24 because it is edged by the thrust bearing 3.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment.

For example, although a thrust ball bearing is used as the thrust bearing 3, the present invention is not limited to this, and a sliding bearing or the like may be used.

(Effects of the invention) As described above, according to the invention, the reciprocating shaft that can move forward and backward only in the axial direction and the rotating shaft that can move forward and backward in the axial direction and can rotate are connected via a thrust bearing, so that the rotating shaft can rotate. No force is transmitted to the reciprocating shaft, and rotational force is not transmitted from the opposite direction to the output shaft of the driving means connected to the reciprocating shaft, so that the driving means etc. can be protected.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the reciprocating shaft according to the embodiment of the present invention in a lifted state, FIG. 2 is a cross-sectional view showing the reciprocating shaft in a depressed state, and FIG. 3 is a cross-sectional view showing an example of use. 1... Connection mechanism that transmits axial force but not rotational force, 2... Reciprocating shaft, 3... Thrust bearing,
4... Rotating shaft, 6... Rotating ring, 7... Fixed ring, 8
...Thrust rest stepped part, 9... Thrust rest stepped part, 10... Gap, 11... Thrust rest stepped part, 12... Thrust rest stepped part.

Claims (1)

[Scope of utility model registration request] A reciprocating shaft that can move forward and backward in the axial direction and a rotary shaft that can move forward and backward in the axial direction and can rotate are arranged in a straight line with their axes aligned, and one of the ends of the reciprocating shaft or the rotating shaft is connected to the other shaft. A housing is provided that encloses the thrust bearing attached to the end, and a pair of thrust bearing stepped portions that hold the thrust bearing by having gaps of approximately 1 mm on both sides of the thrust bearing are connected to the reciprocating shaft and the housing. A coupling mechanism that transmits axial force but does not transmit rotational force, characterized in that a thrust bearing and a reciprocating shaft or a housing are slidably formed.