JPS631875A - Spool type valve - Google Patents

Abstract

PURPOSE:To prevent the fixation phenomenon of a spool by sliding the spool through turning. CONSTITUTION:An installation member 14 is installed at the edge part of a valve body 2, and a motor 15 is installed onto the installation member 14. A connecting shaft 16 is installed in turnable ways onto the installation member 14 through a bearing 17, and the main shaft 18 of the motor 15 is connected at one edge part of the connecting shaft 16, and a cut groove 19 is formed at the other edge part. Further, a spool 5 is inserted in slidable ways into the connecting shaft 16, and an engaging pin 20 which can be slided and engaged with the cut groove 19 is installed onto the spool 5. With such constitution, the fixation phenomenon of the spool can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to spool-type valves such as electromagnetic switching valves, servo valves, proportional control valves, flow control valves, and pressure control valves.

[Conventional technology]

Conventionally, this type of spool type valve has been used in a wide variety of applications such as electromagnetic switching valves and servo valves.

[Problem that the invention seeks to solve]

However, in the case of spool-type valves, when the pressure of hydraulic oil becomes high, the dimensions and fitting intersection of the spool and sliding hole are finished with high precision, so leakage flow through the small gap causes an unbalance in the pressure distribution along the circumference. This may cause the spool to be pressed against one side of the sliding hole, resulting in what is called a spool sticking phenomenon.

As a means for eliminating this sticking phenomenon, a method called dithering, in which a small ripple is added to the input electrical signal when the solenoid is energized, is known for electromagnetic valves.

However, dithering cannot be used when demagnetizing the solenoid, and therefore has the disadvantage that the above-mentioned sticking phenomenon cannot be effectively prevented.

[Means for solving problems]

The purpose of the present invention is to eliminate these inconveniences, and the gist of the present invention is to make it possible to switch the flow path, control the flow rate, etc. by sliding a spool inside the valve body. A spool-type valve is provided that is rotatable, and includes a rotation mechanism for rotating the spool.

[Effect]

The spool is rotated and slid by the rotation mechanism.

〔Example〕

1 to 6 show preferred embodiments of the present invention;
．． Figure 2 shows the first embodiment, Figures 3.4 and 5.
FIG. 6 shows the third embodiment.

In the first embodiment shown in FIGS. 1 and 2, 1 is a spool-type electromagnetic directional control valve, in which a solenoid 3 is provided at one end of a valve body 2, and a sliding hole 4 is formed in the valve body 2. A spool 5 is slidably provided in the sliding hole 4, and the spool 5 is provided so as to be held in a demagnetized position by spring members 7 and 8 on both sides via a seat member 6, and a P port is provided at the center of the valve body 2. A boat 10 and a B boat 11 are installed on both sides.
is provided, and when the solenoid 3 is energized, the plunger protrudes and is configured to be able to switch and slide the spool 5.

Reference numeral 13 denotes a rotation mechanism. In this case, the rotation mechanism 13 is provided with a mounting member 14 at the other end of the valve body 2, a motor 15 is provided on the mounting member 14, and a connecting shaft 16 is mounted on the mounting member 14.
7, the main shaft of the motor is connected to one end of the connection shaft 16, and a U-shaped notch 19 extending in the axial direction is formed at the other end of the connection shaft 16. The opposite end of the spool 5 is slidably inserted into the other end of the spool 5, and the spool 5 is provided with an engaging pin 20 that can be slidably engaged with the notch groove 19.

Since this first embodiment has the above configuration, the spool 5 can be rotated by the motor b of the rotation mechanism 13, and the spool 5 can be rotated and slid firmly, thereby preventing the spool 5 from sticking. Can be done.

The second embodiment in FIG. 3.4 shows another example of the rotation mechanism 13,
In this case, the rotation mechanism 13 includes a mounting member 14 provided between the valve body 2 and the solenoid 3, a motor assembly mounted on the mounting member 14, and a connecting cylinder 21 rotatably provided within the mounting member 14 by a bearing 17. A worm wheel 22 is formed on the connecting tube 21, a transmission shaft n is provided on the prescription member 14, a main shaft 18 of the motor 15 is connected to one end of the transmission shaft 4, and the worm wheel is connected to the other end of the transmission shaft η. Worm 24 meshing with 22
, the blenger twist of the solenoid 3 is loosely inserted into the connecting tube 21 , and the opposite end of the spool 5 is loosely inserted into the connecting tube 21 , and a U-shaped notch groove 19 is formed in the connecting tube 21 . An engaging pin 20 that can engage and slide in the notched groove 19 is provided in the notched groove 19.

Since this second embodiment has the above configuration, the spool 5 is rotated by the motor δ of the rotation mechanism 13 via the worm wheel 22 and the worm.

The third embodiment shown in Fig. 5.6 is applied to an electromagnetic switching valve having a structure in which solenoids 3 are provided on both sides of the valve body 2, and the rotation mechanism 13 in this case is the worm wheel 22 of the second embodiment.
is the sprocket 25, and the mounting member 14 is provided with a sprocket that is rotated by a motor, and a chain is placed between the sprocket and the sprocket! The connecting tube 21 is configured so that it can be hung around and the connecting tube 21 can be rotated.

Since this third embodiment has the above configuration, the spool 5 is rotated by the motor b of the rotation mechanism 13 via the sprocket wheel 6.

These 2nd and 3rd embodiments can also obtain the same effects as the 1st embodiment.

In addition, as another embodiment, a hollow type motor, for example, an ultrasonic motor, may be provided at the position of the connecting tube 21 of the second embodiment, and the spool 5 may be configured to rotate to obtain the same effect. Can be done.

〔Effect of the invention〕

As described above, in the present invention, the spool can be rotated by the rotation mechanism, and the spool can be slid while being rotated, thereby preventing the spool from sticking.

As described above, the intended purpose can be fully achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal cross-sectional view of the first embodiment, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is a cross-sectional view of the second embodiment.
FIG. 4 is a longitudinal cross-sectional view of the embodiment, FIG. 5 is a longitudinal cross-sectional view of the third embodiment, and FIG. 6 is a cross-sectional view thereof. 2. Valve body, 5. Spool, 13. Rotating mechanism. June 18, 1985 Applicant Riken Seiki Co., Ltd. Riken Kiki Co., Ltd.

Claims (1)

[Claims] In a valve in which the spool inside the valve body can be slid to control flow path switching, flow rate, etc., the above-mentioned spool is rotatably provided, and a rotation mechanism for rotating the spool is provided. Features a spool type valve.