JPH04114159U - Screw shaft adjustment mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a device that can easily adjust and lock the axial position of a screw shaft in a device that performs some kind of operation or control based on the axial position of the screw shaft. [Structure] A screw shaft is screwed into a screw sleeve, a male taper part is provided at the end of this screw sleeve, and an axial slot is provided in this male taper part, and the above-mentioned groove is provided on the outer periphery of this screw sleeve. A screw shaft adjustment mechanism in which a lock ring having a female taper part that engages with a male taper part is movable in the axial direction. By bringing the female tapered portion of the lock ring into contact with the male tapered portion of the threaded sleeve, a force in the direction of diameter reduction can be applied to the threaded sleeve through the slot, thereby locking the rotation of the threaded shaft. Conversely, if the female taper part of the lock ring is separated from the male taper part of the threaded sleeve, the force in the diameter reduction direction on the threaded sleeve is removed, so that the threaded shaft can be rotated.

Description

[Detailed explanation of the idea]

0001

【Technical field】

The present invention relates to a screw shaft adjustment mechanism, in particular, the axial position of the screw shaft. In a device that operates or controls the screw shaft, the axial position of the screw shaft is adjusted and This invention relates to a screw adjusting device that allows easy adjustment of screws.

0002

[Prior art and its problems]

This type of screw shaft adjustment mechanism is widely used in various valve mechanisms and the like. this screw In the shaft adjustment mechanism, when adjusting the axial position of the screw shaft, the rotation operation of the screw shaft is obstructed. After adjustment, it is necessary to lock the screw shaft in the adjusted position. be. For this reason, it has traditionally been common practice to thread multiple lock nuts onto a screw shaft. It has been. However, this lock nut mechanism is difficult to unlock, adjust the rotation of the screw shaft, There is a complaint that the series of operations such as locking and relocking is not quick enough.

0003 In addition, the screw shaft is designed to be able to slide in the axial direction and rotate integrally in the rotational direction. A lock ring having lock teeth is provided, and the lock ring of this lock ring is attached to the fixed part. A sliding rotary lock mechanism is also known which is provided with lock teeth that engage with and disengage from lock teeth. This sliding rotation lock mechanism allows you to unlock and release the lock by moving the lock ring in the axial direction. The axis of the screw shaft can be locked by rotating the lock ring in the unlocked state. Since the direction and position can be adjusted, quick operation is possible. However, with this device , the rotation angle accuracy (pitch) of the screw shaft is limited by the installation pitch of the lock teeth. I end up. In other words, the minimum adjustable rotation angle pitch of the screw shaft is determined by the setting of the lock teeth. Adjust the rotation position of the screw shaft at an angle smaller than this pitch. I couldn't.

0004

[Purpose of invention]

The present invention was developed based on the awareness of the problems with conventional screw shaft adjustment devices. Fast operation is possible, and the adjustment rotation position of the screw shaft can be made stepless. The purpose is to obtain a coaxial adjustment device.

[0005]

[Summary of the idea]

In this invention, a screw shaft is screwed into a screw sleeve, and a male A tapered part is provided, and an axial slot is provided in this male taper part, and this screw A lock ring having a female taper part on the outer periphery of the sleeve that engages with the male taper part. It is characterized by being movable in the axial direction.

[0006] According to this configuration, the female taper of the lock ring is connected to the male taper of the threaded sleeve. By bringing them into contact, force is applied to the threaded sleeve in the direction of diameter reduction through the slotted groove, and the thread The rotation of the same shaft can be locked. Conversely, screw the female taper part of the lock ring. If it is separated from the male taper part of the sleeve, the force in the diametrical direction on the threaded sleeve will be reduced. Since it is removed, the screw shaft can be rotated.

[0007] Between the lock ring and the screw shaft, insert the female taper part of the lock ring into the screw sleeve. An engaging means is provided that engages each other in the rotational direction only when separated from the male taper portion of the It is preferable to According to this rotational direction engagement means, the rotation of the lock ring The screw shaft can be rotated.

[0008]

【Example】

The invention will now be described with reference to the illustrated embodiments. This example is a pressure reducing valve (air relay). ), the screw shaft adjustment mechanism is used as the adjustment mechanism for the secondary extraction pressure. It is used.

[0009] The housing 11 includes symbols 11a, 11b, 11c, and 11d in order from the top of the figure. It is composed of four members marked with . The lowermost housing 11d has primary pressure The inlet 12 and the secondary pressure outlet 13 are open. Primary pressure inlet 12 and 2 The passage 16 between the next pressure outlet 13 is opened and closed by the main valve 17, and is normally operated by the compression spring 1. 8, this main valve 17 closes the passage 16.

0010 A control chamber 20 is provided in the uppermost housing 11a, and the inside of this control chamber 20 is A measuring capsule 21 made of an elastic body is disposed in the holder. Target of this invention The screw shaft adjustment mechanism 50 is for raising and lowering this measuring capsule 21. be.

[0011] A pilot valve 24 is integrally provided in the measuring capsule 21, This pilot valve 24 faces into the pilot pressure chamber 25. Pilot valve 2 4 is a communication path 26 between the control chamber 20 and the pilot pressure chamber 25 depending on its vertical position. The amount of air flowing from the control chamber 20 into the pilot pressure chamber 25 by changing the flow path area The communication path 26 is not completely blocked. pilot The pressure chamber 25 communicates with the outside air through a bleed hole 27. In the control room 20, there is a secondary pressure The secondary pressure outlet 1 is connected to the secondary pressure outlet 1 through the outlet chamber 30 and the communication passage 31 that communicate with the force outlet 13. 3 side secondary pressure is introduced.

0012 The lower wall of the pilot pressure chamber 25 is defined by a pilot diaphragm 32. The pilot diaphragm 32 has its periphery connected to the housings 11b and 11. The center portions are respectively fixed to the upper surface of the floating piston 33 between the positions c. floating A control diaphragm 34 facing into the extraction chamber 30 is located on the lower surface of the piston 33. The periphery of this control diaphragm 34 is also fixed to the housing. It is fixed between the pilot diaphragm 32 and the pilot diaphragm 32. A relief chamber 35 is formed between the control diaphragms 34. Lily The air chamber 35 communicates with the outside air through a relief hole 36 formed in the housing 11. Ru. The pilot diaphragm 32 and the control diaphragm 34 The pilot diaphragm 32 is set to have a larger pressure area.

[0013] The floating piston 33 has a communication hole 3 that communicates the extraction chamber 30 and the relief chamber 35. 7 is formed, and this communication hole 37 is connected to a relief valve 38 integrated with the main valve 17. It is opened and closed by 39 is a compression spring that pushes the floating piston 33 downward.

[0014] The pilot valve 24 also has a ball body 44 at the upper end of its shaft. A leaf spring body 45 acts on the ball body 44 to keep the ball body 44 of the measuring capsule 21 at all times. It's pressed against the bottom. In other words, the pilot valve 24 is always in the measuring capsule. It moves up and down according to the up and down movement of 21.

[0015] The screw shaft adjustment mechanism 50 changes the axial position of the measuring capsule 21. An adjusting screw shaft 51 is fixed to the capsule measuring capsule 21. There is. A male threaded portion 51a on the outer periphery of this adjustment screw shaft 51 is fixed to the housing 11a. It is screwed into the female threaded portion 52a of the threaded sleeve. The threaded sleeve 52 The upper end has a male tapered part 52b, and this male tapered part 52b has a shape shown in FIG. At least a pair of axial grooves 52c are formed. Adjustment screw shaft 5 1, a flange portion 51b is integrally provided above the male threaded portion 51a, and this flange portion 51b is integrally provided above the male threaded portion 51a. A rotational direction integrated groove 51b is formed on the outer periphery of the flange portion 51b. adjustment screw A driver groove 51d is further formed at the upper end of the shaft 51.

[0016] A threaded sleeve 52 and a concentric cylindrical portion 11e are integrally formed in the housing 11a. A cylindrical lock ring 54 is inserted between the cylindrical portion 11e and the threaded sleeve 52. Fitted so as to be movable in the axial direction. This lock ring 54 has a hole in its shaft hole. It has a female tapered portion 54a that engages with and disengages from the female threaded portion 52a of the same sleeve 52, and further includes: A rotation direction integration groove 54b that engages and disengages from the rotation direction integration groove 51c of the adjustment screw shaft 51 is provided. have. The rotation direction integrated grooves 51b and 54b are formed when the lock ring 54 is in the lowered position. , the female taper portion 54a engages with the male taper portion 52b of the threaded sleeve 52. When the lock ring 54 is closed (Fig. 1), the lock ring 54 is pulled up and the female taper part is not engaged. When 54a is separated from male taper portion 52b (Fig. 2), they engage with each other and become integral in the rotational direction. be converted into Note that the adjustment screw shaft 51 is connected to the measuring capsule 21 through an axial passage 51e. The axial passage 51e communicates with the inside and communicates with the atmosphere.

[0017] The present pneumatic relay configured as described above operates as follows. In other words, the primary pressure is now introduced. For the pressure supplied to the port 12, there is a pressure supplied to the secondary pressure outlet 13. Suppose you maintain balance. In this state, the pressure on the inlet 12 side decreases. Then, the pressure in the control chamber 20 is relative to the pressure in the measuring capsule 21. , and the measuring capsule 21 expands. Then, the pilot valve 24 goes down. As a result, the pressure inside the pilot pressure chamber 25 increases, and the pressure in the pilot pressure chamber 25 increases. The pilot diaphragm 32 and floating piston 32 descend. Floating pin that has fallen The stone 32 pushes the relief valve 38 to lower the main valve 17 and open the passage 16. Therefore, the high pressure on the primary pressure inlet 12 side is transferred to the extraction chamber 30, that is, on the secondary pressure outlet 13 side. force is introduced.

[0018] When the pressure inside the extraction chamber 30 reaches a certain value, the control diaphragm 3 4 rises together with the floating piston 32 under the pressure. Then, the floating piste Since the valve 32 is separated from the relief valve 38, the extraction chamber 30 is separated from the relief chamber 35 and the relief valve 38. It communicates with the outside air through the relief hole 36, and as a result, the pressure inside the extraction chamber 30 decreases. .

[0019] Since the above two operations are performed continuously, the pressure is taken out to the secondary pressure outlet 13. Regardless of the magnitude of the primary pressure, the secondary pressure The size is controlled to a constant value depending on the direction position.

[0020] On the other hand, when the vertical position of the measuring capsule 21 changes, the pilot The valve 24 moves up and down, and the initial communication area between the pilot valve 24 and the communication passage 26 changes. do. Therefore, it is possible to adjust the secondary pressure to be taken out.

[0021] According to the screw shaft adjustment mechanism 50 of the present invention, the measuring capsule 21 can be To quickly adjust and lock the position, that is, the axial position of the adjusting screw shaft 51. I can do that. That is, when the lock ring 54 is pulled up a certain distance, as shown in FIG. Then, the female taper portion 54a separates from the male taper portion 52b of the threaded sleeve 52, and the rotation direction The facing integrated groove 51b and the rotational direction integrated groove 54b engage with each other. Then, the sliding groove 52c Since no force is applied in the diametrical direction to the threaded sleeve 52 which is divided by , by rotating the lock ring 54, the adjustment screw shaft 51 is also rotated. can be done. When the adjusting screw shaft 51 rotates, the male threaded portion 51a and the female threaded portion 52 Due to the screwing relationship of a, the adjusting screw shaft 51, that is, the measuring capsule 21 can be moved up or down. move in the direction.

[0022] After adjusting the vertical position of the measuring capsule 21, the lock ring 54 and lower the female tapered portion 54a to the male tapered portion 52b of the threaded sleeve 52. When pressed, the threaded sleeve 52 divided by the slotted groove 52c is pressed in a diameter-reduced direction. A force in the direction is added. Therefore, the rotation of the adjustment screw shaft 51 is locked.

[0023] Rotation adjustment of the adjustment screw shaft 51 is performed by inserting a driver into the driver groove 51d. However, it is also possible to engage the rotational direction integration groove 54b and the rotational direction integration groove 51b. In the illustrated embodiment, the lock ring 54 and the adjusting screw shaft 51 are integrated in the rotational direction. According to this, faster adjustment work and locking are possible.

[0024] The above embodiment is based on the mechanism for adjusting the vertical position of the measuring capsule 21 of the pressure reducing valve. This invention is applicable to needle valves, throttle valves, etc. Furthermore, depending on the position of the adjustment screw shaft 51, there is a mechanism for making some adjustments. Widely applicable.

[0025]

[Effect of the idea]

As described above, according to the present invention, it is possible to adjust the axial position of the screw shaft, lock it, and and unlocking can be performed quickly. According to claim 2, the lock further includes: By moving the ring in the unlocking direction, it can be connected to the screw shaft at the same time. This improves the rotary operation of the screw shaft.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a pressure reducing valve to which the screw shaft adjustment mechanism of the present invention is applied.

FIG. 2 is a longitudinal cross-sectional view of essential parts of the screw shaft adjustment mechanism in FIG. 1, showing a state different from that in FIG. 1;

FIG. 3 is a perspective view of essential parts of the screw shaft adjustment mechanism in FIG. 1;

[Explanation of symbols]

11 Housing 11e Cylindrical part 50 Screw shaft adjustment mechanism 51 Adjustment screw shaft 51a Male thread part 51c Rotation direction integrated groove (rotation direction engagement means) 52 Threaded sleeve 52a Female thread part 52b Male taper part 52c Sliding groove 54 Lock ring 54a Female taper part 54b Rotation direction integrated groove (rotation direction engagement means)

Continuation of front page (72) Creator Takashi Ejiri 3-13-16 Nakano, Nakano-ku, Tokyo

Claims (2)

[Scope of utility model registration request] 1. A threaded shaft having a male threaded portion on the outer periphery; a threaded sleeve having a female threaded portion that engages with the male threaded portion of the threaded shaft; a male tapered portion formed at an end of the threaded sleeve;
A lock having an axial sliding groove formed in the male tapered portion; and a female tapered portion that engages with the male tapered portion of the threaded sleeve, and is fitted to the outer periphery of the threaded sleeve so as to be movable in the axial direction. A screw shaft adjustment mechanism characterized by comprising a ring; 2. In claim 1, the lock ring and the threaded shaft are rotatably engaged with each other only when the female taper portion of the lock ring is separated from the male taper portion of the threaded sleeve. A screw shaft adjustment mechanism is provided with means.