JPH0821559A - Manually operated valve - Google Patents

Abstract

PURPOSE:To reduce the number of component parts and lessen the overall length by combining a detent mechanism with a center mechanism consolidatedly, and allowing a valve stem to be located in the neutral position when a detent in the detent mechanism is engaged by a V-form recess provided in a frame. CONSTITUTION:A cylinder 2 fixed to the left end of the stem 1 of a manual operation valve is formed so that a ring-shaped recess 2G as a detent mechanism and a conical recess 2C to work as a spring center function are arranged adjacently in the axial direction. A compression spring 4 is interposed between an adjusting screw 5 and a ball 3, and they are set in a cover 7, and the ball 3 is energized and engaged by the recesses 2G, 2C. When transferred to the rinrecess 2C, the ball 3 is allowed to reach the min. diameter position A of the conical recess 2C by the energization force of the compression spring 4, i.e., the valve stem 1 is displaced to the right to be located in the neutral position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an operation valve for switching a flow path by a manual operation.

[0002]

2. Description of the Related Art A manually operated valve of this kind is commonly used in hydraulic equipment, for example, as an operating equipment such as a hydraulic forklift. This manually operated valve is shown in FIG.
As shown in FIG. 3, a three-position switching valve is a typical one. However, a hydraulic port in which the valve body VH is located in three positions of a neutral position and two left and right positions and is connected to a hydraulic power source (not shown) P
Shut off pressure oil from W, or left port LP, right port RP
One of these is switched and connected. In addition to the above ports, a port DL connected to the drain is formed in the valve hole of the valve housing (valve casing) VB. A cover CO is attached to the left end of the valve housing VB,
Inside this, a spring (compression spring) CS is interposed, and its elastic force acts on the valve shaft SP to install a neutral holding mechanism, so-called a spring center mechanism, for holding the valve body VH at the neutral position. That is, the spring CS is press-fitted between the spring receiver RS fixed to the valve housing VB and the spring receiver LS fixed to the cover CO, and the valve body VH is neutral when the operating lever L is released. Held in position. The operating lever L is connected to the valve shaft SP via the connecting rod CL connected to the pin P1, and when the operating lever L swings around the pin P2, the operating lever L is positioned at two left and right positions against the elastic force of the spring. To be done. VW is a cover frame attached to the right end of the valve housing VB. T is a handle of the operating lever L.

When the valve body VH is positioned at two positions, the pressure oil from the port PW is left port LP or right port R.
The hydraulic pressure is supplied to or discharged from a hydraulic actuator (forklift drive cylinder) by being switched and connected to any one of P. At the left and right positions of the valve shaft SP, a detent mechanism may be installed in order to hold the position after manual operation. As shown in FIG. 3, for example, this detent mechanism fixes a detent collar D having a concave portion formed around it at the left end of the normal valve shaft SP, and biases and engages with the concave portions M1 and M2 of the detent collar D. A compound ball (usually a ball such as a steel ball) K is installed so as to advance and retract in the vertical direction from the outside of the valve shaft SP. In the case shown, the spring center mechanism and the spring center mechanism are arranged side by side. N is a screw for adjusting the elastic setting of the engaging element K. When the valve shaft SP reaches the operating position, the balls K are engaged with the recesses M1 and M2 of the detent collar D to hold the operating position of the valve shaft SP against the elasticity of the spring center mechanism. In FIG. 3, BS is a screw for fixing the spring bearing LS to the left end of the valve shaft SP.

[0004]

However, in the conventional manually operated valve of this type, the spring center mechanism and the detent mechanism are separately installed, which complicates the structure of the manually operated valve and increases the size of the entire valve. Was invited. That is, since the spring center mechanism and the detent mechanism are installed separately, not only are there a large number of parts and are prone to failure,
There is a problem that the entire valve cannot be installed in a limited space by lengthening the valve shaft.

The present invention provides a manually operated valve that solves the above-mentioned conventional problems.

[0006]

A manually operated valve provided by the present invention includes an engaging portion fixed to a valve shaft side or a valve casing, and an engaging portion fixed to the valve casing side or the valve shaft side and biased to the engaging portion. In an operating valve having an engaging element for engaging and having a detent mechanism for engaging the engaging element with an engaging portion at a manual operation position and holding the position, the operating valve is fixed to the valve casing side or the valve shaft side. A frame body having a V-shaped concave portion is disposed adjacent to the engaging portion of the detent mechanism on the valve shaft side or the valve casing, and an engaging element of the detent mechanism is engaged with the V-shaped concave portion of the frame body. Then, the valve shaft is positioned in the neutral position.

[0007]

According to the manually operated valve provided by the present invention, the detent mechanism and the center mechanism are integrally combined, and in particular, the engaging element of the detent mechanism is a V of the frame.
When engaged with the V-shaped recess, the engagement element is locked at a predetermined position of the V-shaped recess by the urging force of the engagement element, and the valve shaft is positioned at the neutral position.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a diagram showing a configuration of a main part of a manually operated valve provided by the present invention. FIG. 1 is a diagram showing the configuration of the left end portion of the manually operated valve as in FIG.

In the figure, the left end portion of the valve housing 6 is sealed by a cover 7, and an integral mechanism having both a spring center function and a detent function is installed inside thereof. That is, the cylindrical body 2 is fixed to the left end of the valve shaft 1. In this cylindrical body 2, a ring-shaped recess 2G as a detent mechanism and a cone-shaped recess (V-shaped recess) 2C that exhibits a spring center function are arranged adjacent to each other in the axial direction. 2R is a right end land portion of the cylindrical body 2, 2L is a left end land portion of the cylindrical body 2, and 2M is a central land portion of the cylindrical body 2. An engagement element (ball) 3 is engaged with the ring-shaped recess 2G and the cone-shaped recess 2C, and is held in a mounting hole 7H formed in the cover 7 so as to be able to move back and forth. A compression spring 4 is an adjusting screw 5 and a ball 3
And the ball 3 is urged into the ring-shaped recess 2G and the cone-shaped recess 2C. Therefore, for example, as shown in the drawing, when the ball 3 moves from the ring-shaped recess 2G over the land 2M and moves to the cone-shaped recess 2C, the ball 3 gradually advances due to the biasing force of the compression spring 4 and reaches the minimum diameter position A of the cone-shaped recess 2C. Trying to reach. Therefore, the valve shaft 1 is displaced to the right and positioned in the neutral position. The present invention is characterized in that the valve shaft 1 is positioned at the neutral position by the biasing engagement of the ball 3 with the V-shaped recess 2C.
The distance between the set position A and the center position of the ring-shaped recess 2G is determined by the distance between the switching position of the manually operated valve and the neutral position.

Although the present invention has been described above,
It is intended to include various modified examples utilizing the features of the invention. For example, regarding the shape of the V-shaped concave portion, the illustrated example is a cone-shaped concave portion having a central valley shape that is ready for processing, convenient for mounting, and advantageous for maintenance. The present invention is also applicable to a frame forming a. In this case, the recess as the detent mechanism does not have to be ring-shaped, and the ball may simply be biased and engaged. The shape of the engaging element is not limited to a ball shape as long as it conforms to the shape of the concave portion to be engaged, and may be, for example, a V-shaped tip. Further, as the configuration in which the V-shaped concave portion and the concave portion of the detent mechanism are arranged adjacent to each other, they may be formed as separate members instead of being integrally formed, and they may be arranged in a joined manner. This adjacent range is within the range expected from the distance between the neutral position and the switching position of the valve. In the case of the cylindrical body shown in the figure, it is not always necessary to provide the land portion. Further, although the illustrated example shows an example in which the engagement element and the spring for urging the engagement element are installed on the valve housing (cover) side of the valve casing side, these are installed on the valve shaft and spool side, and conversely detent. It is also possible to install a concave portion as a mechanism or a V-shaped concave portion for setting the valve shaft at the neutral position on the valve housing (cover) side. Furthermore, although the 3-position switching valve has been mainly described as the manual operation valve, there are multi-position switching valves such as 2-position and 4-position, and the manual operation mechanism is not limited to the illustrated example, and various modifications are possible. Includes. It can also be used as a manually operated valve other than the hydraulic valve.

The present invention is summarized as follows.

Appendix 1 An engaging portion fixed to the valve shaft side or the valve casing, and an engaging element fixed to the valve casing side or the valve shaft side and biasingly engaging with the engaging portion are provided at a manual operation position. In an operation valve having a detent mechanism for holding an engagement position of an engagement member by biasing the engagement member, a frame body having a V-shaped recess fixed to the valve casing side or the valve shaft side is the detent. The valve shaft is positioned adjacent to the engaging portion of the mechanism on the valve shaft side or the valve casing side, and when the engaging member of the detent mechanism is biased and engaged with the V-shaped recess of the frame body, the valve shaft is positioned at the neutral position. A manually operated valve characterized by being configured as described above.

Appendix 2 A ring-shaped recess fixed to the valve shaft side or the valve casing, and an engaging member fixed to the valve casing side or the valve shaft side and biasingly engaged with the ring-shaped recess are provided at a manually operated position. In a control valve provided with a detent mechanism in which an engaging element urges the ring-shaped recess to hold the position, a frame body having a cone-shaped recess fixed to the valve casing side or the valve shaft side is used as the detent mechanism. Is disposed adjacent to the ring-shaped recess on the valve shaft side or the valve casing side, and when the engaging member of the detent mechanism is biased and engaged with the cone-shaped recess of the frame body, the valve shaft is positioned at the neutral position. A manually operated valve characterized by being configured as described above.

Appendix 3 A ring-shaped recess fixed to the valve shaft side or the valve casing, and a ball fixed to the valve casing side or the valve shaft side and biasingly engaged with the ring-shaped recess are provided. In a control valve provided with a detent mechanism for holding a ball position by urgingly engaging a ball-shaped concave portion, a frame body having a cone-shaped concave portion fixed to the valve casing side or the valve shaft side is a ring of the detent mechanism. Is arranged adjacent to the valve-shaped recess or on the valve-casing side so that when the ball of the detent mechanism is biased into the cone-shaped recess of the frame, the valve shaft is positioned in the neutral position. A manually operated valve characterized in that

Appendix 4 A ring-shaped concave portion on a cylindrical body fixed to the valve shaft side and a ball fixed to the valve casing side and biasingly engaged with the ring-shaped concave portion are provided. In an operation valve provided with a detent mechanism for urging a ball to hold its position, a cone-shaped recess is provided on the cylindrical body and adjacent to a ring-shaped recess, and the ball of the detent mechanism is A manually operated valve characterized in that the valve shaft is positioned in a neutral position when biased into a cone-shaped recess.

[0016]

Since the manually operated valve provided by the present invention is as described above, the number of parts can be greatly reduced and the cost can be reduced. In addition, the overall length of the manually operated valve can be shortened due to the structure, and a small space and a compact device can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a manually operated valve according to the present invention.

FIG. 2 is a diagram showing a configuration of a conventional manually operated valve.

FIG. 3 is a diagram showing a configuration of a conventional manually operated valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve shaft 2 ... Cylindrical body 2G ... Ring-shaped recess 2C ... Cone-shaped recess 3 ... Ball 4 ... Compression spring 5 ... Adjusting screw 6 ... Valve housing 7 ... Cover

Claims (1)

[Claims] 1. An engaging portion fixed to a valve shaft side or a valve casing, and an engaging element fixed to the valve casing side or the valve shaft side and biasingly engaging with the engaging portion. In an operation valve having a detent mechanism for holding an engagement position of an engagement member by biasing the engagement member, a frame body having a V-shaped recess fixed to the valve casing side or the valve shaft side is the detent. The valve shaft is positioned adjacent to the engaging portion of the mechanism on the valve shaft side or the valve casing, and when the engaging member of the detent mechanism is biased and engaged with the V-shaped recess of the frame body, the valve shaft is positioned at the neutral position. A manually operated valve characterized by being configured as described above.