JP2000088118A - Switch valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch valve capable of specifying the movement range of a spool without increasing the number of parts. SOLUTION: This switch valve comprises: a spool hole 3 formed in a valve body 2 and provided at least on one end side with an opening part 10; a spool 4 slidably inserted in the spool hole 3 and communicating or disconnecting a passage for feed oil through movement thereof; a bolt 5 fixed on the end face in a longitudinal direction of the spool 4; a first spring seat 8 positioned on the head part 6 side of the bolt 5; a second spring seat 9 arranged at the opening part 10 of the spool hole 3 and having a through-hole 12 through which the shaft part 11 of a bolt slidably passes-through; and a spring 7 arranged in a contraction state between the first and second spring seats 8 and 9 to energize the spool 4 in a sliding direction. The bolt 5 is fixed on the end face of a spool 4 in a state to insert the shaft part 11 of the bolt 5 through a through-hole 12, and a large diameter part 17 is formed. When the spool 4 is moved in a direction in which it approaches the spool hole 3, the large diameter part 17 is locked at the peripheral edge part of the through-hole 12 of the second spring seat 9 and the movement range in an approaching direction of the spool 4 is specified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a switching valve mainly used in a hydraulic circuit of various industrial machines such as a hydraulic shovel.

[0002]

2. Description of the Related Art A conventional switching valve is constructed as follows. That is, a spool hole formed in the valve body and having an opening at at least one end side, a spool slidably inserted into the spool hole and communicating or blocking the supply oil passage by the movement thereof, and a longitudinal axis of the spool. A bolt fixed to the end face in the direction, and a spring which is contracted to the bolt portion via a pair of spring seats and biases the spool in the sliding direction. One of the spring seats is locked inside a cap surrounding the bolt portion, and the other spring seat is disposed at an opening of the spool hole. In addition, a cylindrical sleeve that defines a range of movement of the spool in the sliding direction is provided at a bolt portion between the two spring seats. Specific prior art documents include Utility Model Registration No. 25666022.
No. registered gazette.

[0003]

The above conventional switching valve has the following features.
Since the movement in the sliding direction of the spool, particularly the movement in the direction of entering the valve body, is defined by the spring seat on the head side of the bolt abutting on the end of the cylindrical sleeve. In addition to the two spring seats, a sleeve must be separately provided on the bolt portion only for defining the movement range,
There has been a problem that the number of parts is increased and the structure and the assembling work are complicated.

[0004] It is an object of the present invention to solve the above-mentioned problems and to provide a switching valve capable of defining a moving range of a spool without increasing the number of parts.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 of the present application provides a spool hole formed in a valve body and having an opening at at least one end side, and slidably inserted into the spool hole. A spool inserted and communicating or blocking the supply oil passage by its movement, a bolt fixed to the longitudinal end face of the spool, a first spring seat located on the head side of the bolt, and the spool A second spring seat having a through-hole that is disposed at the opening of the hole and through which the shaft of the bolt slidably passes; and a second spring seat that is contracted between the first spring seat and the second spring seat. A switching valve having a spring for urging the spool in a sliding direction, wherein the bolt is fixed to an end surface of the spool while the shaft portion is passed through the through hole, and a large diameter portion is formed on the shaft portion. Provided,
When the spool moves in the direction of entering the spool hole, the large-diameter portion is locked to the peripheral edge of the through hole of the second spring seat, so that the moving range of the spool in the entry direction is defined. It is characterized by having made it.

According to the present invention, the large diameter portion is provided on the bolt, and the large diameter portion of the bolt is engaged with the peripheral portion of the through hole of the second spring seat when the spool moves in the approaching direction. Since the range of movement of the spool in the approach direction is defined, it is not necessary to additionally provide a sleeve in addition to the two spring seats as in the related art. That is, the movement range of the spool can be easily defined without increasing the number of parts by only slightly increasing the diameter of the bolt.

According to a second aspect of the present invention, there is provided a spool hole formed in a valve body and having an opening at at least one end side, and is slidably inserted into the spool hole and moved by the movement to supply oil. A spool communicating or blocking the passage, a bolt fixed to an end surface of the spool in a longitudinal direction, a first spring seat located on a head side of the bolt, and a second spring disposed at an opening of the spool hole. A switching valve comprising: a spring seat; and a spring that is contracted between the first spring seat and the second spring seat and biases the spool in a sliding direction.
An extension portion extending in the sliding direction is provided at an end of the spool, a through-hole through which the extension portion of the spool slidably passes is provided in the second spring seat, and the bolt has a shaft portion. Is fixed to the end face of the extending portion passing through the through hole, and the shaft portion has a large diameter portion larger than the through hole, and moves in a direction in which the spool enters the spool hole. At this time, the large-diameter portion is locked to the peripheral portion of the through-hole of the second spring seat so that the range of movement of the spool in the approach direction is defined.

According to the present invention, the second spring seat is provided with a through hole through which the extension provided at the end of the spool slidably passes, and the bolt fixed to the end face of the extension is The shaft portion has a large-diameter portion larger in diameter than the through hole, and when the spool moves in the approaching direction, the large-diameter portion is engaged with the peripheral portion of the through hole of the second spring seat, and the spool is moved. Since the movement range is defined, there is no need to separately provide a sleeve in addition to the two spring seats as in the related art. That is, it is possible to easily define the moving range of the spool without increasing the number of parts by simply providing the extending portion integrally with the end of the spool and slightly increasing the diameter of the bolt. In addition, since it is possible to use a bolt having a uniform diameter (only the large diameter portion), it is not necessary to use special bolts having different diameters. Can be planned. Further, since the connection fixing portion between the spool and the bolt is disengaged farther than the sliding surface of the spool end portion by the extended portion, even if the diameter of the spool is increased due to the screw connection of the bolt, the spool can be removed. Smooth sliding is not hindered.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of a switching valve according to the present invention. In FIG. 1, the switching valve 1 according to the present embodiment corresponds to the one located at substantially the right half of the valve body 2, and the switching valve located at the left half relates to another embodiment described later. . The switching valve 1 according to the present embodiment is configured as follows. A spool 4 is slidably inserted into a spool hole 3 formed in the valve body 2, and the movement of the spool 4 communicates or shuts off a supply oil passage. A bolt 5 is fixed to an end surface of the spool 4 in the longitudinal direction. The bolt 5 is fixed by screwing a small-diameter male screw portion 15 formed at the tip of the shaft portion 11 to a female screw portion 16 formed at the end surface of the spool 4.

In this embodiment, the head 6 of the bolt 5
However, it also serves as a first spring seat 8 for contracting the spring 7. The spring 7 urges the spool 4 in the sliding direction, and is contracted between the first spring seat 8 and the second spring seat 9. The second spring seat 9 has a through hole 12 that is disposed in the opening 10 of the spool hole 3 and through which the shaft 11 of the bolt 5 slidably passes. The bolt 5 is fixed to the end surface of the spool 4 with the shaft 11 passing through the through hole 12. The head 6 of the bolt 5 also serving as the first spring seat 8 is provided with a reduced diameter portion 1 provided at one end of a cap 13 surrounding the bolt portion.
4 and the spool 4 makes the spool hole 3
It defines the range of movement when moving in the direction of exiting from.

The bolt 5 has a second spring seat 9 on its shaft 11.
A large diameter portion 17 larger than the diameter of the through hole 12 is provided. In this embodiment, the large-diameter portion 17 is formed by uniformly increasing the diameter of the shaft portion 11 on the head 6 side as a whole, but the large-diameter portion 17 projects from the outer surface of the shaft portion 11 and Through hole 1
It is sufficient that there is a portion having a diameter larger than the diameter of the shaft portion 2.
The large-diameter portion may be formed in a flange shape (not shown) only at the illustrated boundary portion between the shaft portion 1 and the shaft portion 11, and a projection may be provided on a part of the shaft portion 11 instead of the entire circumference. However, the bolt 5 having the large-diameter portion 17 that is uniformly thick as shown in the drawing is easy to manufacture in terms of manufacturing, and is strong in strength. When the spool 4 moves in the direction of entering the spool hole 3, the large-diameter portion 17 engages with the peripheral portion of the through hole 12 of the second spring seat 9, and the direction in which the spool 4 enters the spool hole 3. It is formed so that the range of movement to is defined. Therefore, the position of the boundary between the large diameter portion 17 and the shaft 11 defines the range of movement of the spool 4 in the approach direction, and the position of the boundary is determined from that viewpoint. .

Next, the operation of the switching valve 1 according to the above embodiment will be described. According to the present embodiment, the large diameter portion 17 is provided on the bolt 5, and when the spool 4 moves in the direction of entering the spool hole 3, the large diameter portion 17 of the bolt 5 The range of movement of the spool 4 in the approaching direction is defined by engaging with the peripheral portion of the through hole 12.
Therefore, there is no need to separately provide a sleeve in addition to the two spring seats as in the related art. That is, the movement range of the spool 4 can be easily defined without increasing the number of parts by only slightly increasing the diameter of the bolt 5.

Next, another embodiment of the present invention will be described. As described above, the switching valve 20 according to this embodiment
Corresponds to the one located in the left half of the valve body 2 in FIG. The switching valve 20 includes a spool hole 3 formed in the valve body 2 and having an opening 10, and a spool 40 slidably inserted into the spool hole 3 and communicating or blocking a supply oil passage by the movement thereof. A bolt 5 fixed to an end face in the longitudinal direction of the spool 40, a first spring seat 8 located on the head 6 side of the bolt 5,
A second spring seat 9 disposed in the opening 10 of the spool 40;
Is provided in the same manner as the above-described embodiment in that a spring 7 for urging the spring in the sliding direction is provided. Therefore, the same portions are denoted by the same reference numerals, and detailed description is omitted.

In this embodiment, an extension 21 extending in the sliding direction is provided at the end of the spool 40, and the extension 21 of the spool 40 slidably passes through the second spring seat 9. A through-hole 12 is provided, and the bolt 5 is fixed to an end face of the extending portion 21 in a state where a shaft thereof passes through the through-hole 12. The bolt 5 does not have the shaft portion 11 in the above embodiment, and the male screw portion 15 is directly provided on the large diameter portion 17. When the spool 40 moves in the direction of entering the spool hole 3, the large-diameter portion 17
Is locked to the peripheral portion of the through hole 12 of the second spring seat 9 so that the range of movement of the spool 40 in the approach direction is defined. The difference between the switching valve 20 according to this embodiment and the switching valve 1 according to the embodiment is that the shaft portion 11 of the bolt 5 in the switching valve 1 is omitted, and instead, the spool is provided in the switching valve 20. The point is that the extending portion 21 is formed on the 40 side, and other configurations are basically the same.

Next, the switching valve 20 according to the latter embodiment will be described.
The operation of will be described. According to the present embodiment, the second spring seat 9 is provided with the through-hole 12 through which the extending portion 21 provided at the end of the spool 40 slidably passes.
Of the bolt 5 fixed to the end face of the through hole 1
The large diameter portion 17 is larger than the second spring seat 9 when the spool 40 moves in the approaching direction.
Is locked to the peripheral portion of the through hole 12 to define the moving range of the spool 40. Therefore, it is not necessary to provide a sleeve in addition to the two spring seats as in the related art. In other words, by simply providing the extending portion 21 at the end of the spool 40 and slightly increasing the diameter of the bolt 5, the movement range of the spool can be easily defined without increasing the number of components.

Further, since the shaft of the bolt 5 can have a uniform diameter (only the large diameter portion), it is not necessary to use a special bolt having a different diameter, and a general-purpose bolt is sufficient. Thus, costs can be reduced. Further, the connection fixing portion (the screwing portion between the male screw portion 15 and the female screw portion 16) between the spool 40 and the bolt 5 by the extension portion 21 is higher than the sliding surface (the inner surface of the opening 10) at the end of the spool 40. Since the spool 40 is detached far away, even if the diameter of the spool 40 increases due to the threaded connection of the bolt 5, the smooth sliding of the spool 40 is not hindered.

[0017]

According to the present invention, the moving range of the spool can be easily defined without increasing the number of parts. That is, when the spool moves in the approaching direction, the large-diameter portion of the bolt is locked to the peripheral portion of the through hole of the second spring seat, thereby defining the moving range of the spool in the approaching direction. Therefore, it is not necessary to additionally provide a sleeve in addition to the two spring seats as in the related art. Therefore, the movement range of the spool can be easily defined without increasing the number of parts by only slightly increasing the diameter of the bolt.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a switching valve according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switching valve 2 Valve body 3 Spool hole 4 Spool 5 Bolt 6 Bolt head 7 Spring 8 First spring seat 9 Second spring seat 10 Opening 11 Shaft 12 Through hole 13 Cap 14 Reduced diameter portion 17 Large diameter portion 20 Switching valve 21 Extension part 40 Spool

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kensuke Ioku 1-16-11, Fukuyoshidai, Nishi-ku, Kobe-shi, Hyogo F-term in Nabco Seishin Plant (reference) 2D003 AA01 BA08 DA02 3H053 AA25 AA35 BA04 BB03 BC03 BD02 DA11 3H067 AA17 CC32 CC33 DD05 ED01 ED11 GG15 GG22

Claims (2)

[Claims] A spool formed in the valve body and having an opening at at least one end side; a spool slidably inserted into the spool hole and communicating or blocking a supply oil passage by the movement thereof; A bolt fixed to a longitudinal end surface of the spool, a first spring seat located on the head side of the bolt, and a shaft portion of the bolt that is disposed in an opening of the spool hole and slidably penetrates. A switching spring provided with a second spring seat having a through hole formed therein, and a spring compressed between the first spring seat and the second spring seat to bias the spool in a sliding direction. Is fixed to the end surface of the spool while the shaft portion is passed through the through hole, and a large diameter portion is provided on the shaft portion. When the spool moves in a direction to enter the spool hole, the large diameter portion is provided. Part of the second spring seat Switching valve, characterized in that engaged with the periphery of the through hole was set to move the range to the approach direction of the spool is defined. A spool hole formed in the valve body and having an opening at at least one end side, a spool slidably inserted into the spool hole and communicating or blocking a supply oil passage by the movement thereof; A bolt fixed to an end face in a longitudinal direction of the spool, a first spring seat located on the head side of the bolt, a second spring seat disposed at an opening of the spool hole, and the first spring seat. A switching valve having a spring contracted between the second spring seat and the spring for urging the spool in the sliding direction, wherein an extension portion extending in the sliding direction is provided at an end of the spool; The second spring seat is provided with a through hole through which the extending portion of the spool slidably penetrates, and the bolt is fixed to an end face of the extending portion with a shaft portion passing through the through hole. And the shaft has a larger diameter than the through hole. When the spool moves in the direction of entering the spool hole, the large-diameter portion is locked to the peripheral portion of the through hole of the second spring seat, and the movement range of the spool in the entry direction is defined. A switching valve, characterized in that the switching valve is operated.