JP2001165337A - Valve spool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve spool with an overlap part beyond the groove width of a port at a spool land that allows reducing cost and improving dimensional accuracy. SOLUTION: A valve spool 3 comprises a general part 15 wherein a first spool land 12 opens and closes an oil-groove of a valve body side and has the same width W1 as the groove width and an overlap part 17 which permits an flow of oil in the oil-groove and prevents a fall to the oil-groove of the general part 15. A block groove 21 with a taper-shaped verge of opening is provided between the general part 15 and the overlap part 17. In forming the block groove 21, a taper surface 21a is formed at an edge part opposed to both the general part 15 and the overlap part 17, and then an after-treatment for deburring by grinding and shot peening or the like becomes unnecessary. In addition, if making the valve spool 3 with aluminum, the after-treatment for deburring by hand becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve spool constituting, for example, a hydraulic control valve.

[0002]

2. Description of the Related Art Conventionally, for example, a hydraulic control valve 1 as shown in FIG. 4 is used in a hydraulic circuit of an automatic transmission for an automobile. The hydraulic control valve 1 operates a spool-type valve body, that is, a valve spool 3, disposed in a valve body 2 in an axial direction by an actuator (solenoid or the like) not shown or an operating force of a shift lever, etc. The pressure adjustment and switching are performed.

The valve body 2 has one end side (FIG. 4).
The first port 4, the second port 5, the third port 6, and the drain port 7 are provided in this order from the left side, and the inner peripheral surface of the valve body 2 has openings inside the ports 4 to 7. First to fourth oil grooves 8 to 11 forming a portion are provided. Correspondingly, a first spool land 12 that opens and closes the second port 5 is provided on the valve spool 3.
And a second spool land 13 for opening and closing the drain port 7, and a spool rod 14 connected to the above-described actuator or the like extends on the other end side.

In addition, the first and second spool lands 1
The land widths W1 and W2 of the second and the thirteenth are respectively
The groove widths W3 and W4 of the oil groove 5 and the fourth oil groove 7 are set to be the same. For this reason, one end of the first spool land 12 and the other end of the second spool land 13 are connected to the general portions 15 and 16 having a basic function of opening and closing the oil passage, and are caused by peripheral clearance. Lands 12 and 13
Overlap portions 17 and 18 for preventing the oil grooves 5 and 7 from dropping into the respective oil grooves 5 and 7 are formed. Each overlap part 1
7 and 18, after processing the widths of the spool lands 12 and 13 slightly in advance, and then shaving off both side peripheral surfaces of the portions exceeding the land widths W1 and W2, so that the end surface shape becomes a barrel shape. Formed (see FIG. 5),
This allows the oil to flow around each of the overlap portions 17 and 18.

On the other hand, in such a valve spool 3 as in a general valve spool, the valve body 2
It is necessary to slide smoothly with respect to. Therefore, in the manufacture thereof, it is required to surely remove burrs generated at the edge portions when the spool lands 12 and 13 and the overlap portions 17 and 18 are processed. In addition, since it is difficult to remove burrs on the edge portions of the first and second spool lands 12 and 13 where the overlap portions 17 and 18 protrude, it is generally difficult to remove the burrs. Deburring methods by polishing and shot peening have been implemented.

[0006]

However, in the above-described valve spool 3, in order to ensure the accuracy of the pressure regulation value and the hydraulic pressure switching position, the land of the spool lands 12, 13 is required, as in the case of the normal valve spool. Although high dimensional accuracy is required for the widths W1 and W2, when removing burrs by barrel polishing, shot peening, or the like, the land widths W1 and W2 of the spool lands 12 and 13 vary, and the land widths W1 and W2 are varied. The dimensional control of W2 could not be strictly performed.

Although the above-described deburring method is effective when the valve spool 3 is made of iron and its surface is hard, it is resistant to the above-mentioned deburring method, for example, when it is made of aluminum or the like. If it is made of a material that does not have a sufficient degree of hardness, it cannot be used because the surface is scratched. Therefore, in such a case, the above-described chamfering must be performed manually, which is a factor that hinders cost reduction of the valve spool.

The present invention has been made in view of such a conventional problem, and can reduce the cost and improve the dimensional accuracy even if the spool land has an overlap portion exceeding the groove width of the port. It is an object of the present invention to provide a valve spool that can be used and can handle a wide range of materials.

[0009]

According to the present invention, in order to solve the above-mentioned problem, the land width which is mainly accommodated in the valve body and which is the same as the groove width of the groove of the valve body to which the port communicates is mainly provided. A valve spool provided with a set spool land, and an overlap portion having a shape allowing fluid flow through the port protruding beyond the land width. Between the overlapping portion, a partitioning groove having both sides and a tapered opening edge is provided.

In this configuration, since the opening edge of the partition groove is tapered, the edge portion of the general portion of the spool land on the overlap portion side becomes tapered when the partition groove is provided, so that barrel polishing and shot Post-processing for the purpose of deburring by peening or the like becomes unnecessary.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged view of a main part showing one end of the valve spool 3 when the present invention is applied to the valve spool 3 of the hydraulic control valve 1 described with reference to FIG.

Also in the valve spool 3 of the present embodiment, the first spool land 12 has a land portion W1 having the same land width W1 as the groove width W3 of the second oil groove 9 described above.
And an overlap portion 17 for preventing the first spool land 12 from dropping into the second oil groove 9 while allowing the oil to flow through the second oil groove 9 (second port 5). Have. On the other hand, in the present embodiment, the general unit 15
A partition groove 21 having a tapered opening edge is formed between the overlap portion 17 and the overlap portion 17. The overlap portion 17 is formed on the first spool land 12 according to the procedure shown in FIG. That is, the overlap portion 17 has a width W0 of the first spool land 12.
Is slightly larger than the land width W1 in advance, and a V-shaped section groove 21 is cut on the peripheral surface 12 by a cutting tool over the entire circumference (see FIG. 2A).
By shaving off the peripheral surfaces on both sides of the portion exceeding 1 (refer to FIG. 2B), the end surface shape is formed in a barrel shape, as described in the prior art. As a result, a tapered surface 21a is formed at the opposing edge portion between the first spool land 12 and the overlap portion 17. Although not shown, the valve spool 3
The second spool land 13 located at the other end of the second spool land 13
Also, the overlap portion 18 is formed in the same manner as described above.

In this embodiment having the above configuration, since the partitioning groove 21 has a V-shaped cross section, when the overlapping portion 17 is formed on the first spool land 12, the overlapping portion 17 of the general portion 15 is formed. The tapered surface 21a can be provided on the edge portion located on the side and the edge portion of the overlap portion 17 facing the edge portion. Therefore, after the overlap portion 17 is formed, post-processing for the purpose of deburring by barrel polishing, shot peening, or the like is not required on the edge portion. Therefore, it is possible to reduce the cost of the valve spool 3 by reducing the processing cost. In particular, even if the valve spool 3 is made of aluminum or the like that cannot be deburred by barrel polishing, shot peening, or the like, it can cope with such a case.
The above-described effect is significant because the conventional manual deburring operation is unnecessary. Further, since post-processing such as barrel polishing and shot peening is not required, the land width W1 of the first spool land 12 can be controlled within a tolerance range, and a high dimensional accuracy is ensured for the land width W1. can do.

The partitioning groove 21 may have a sectional shape other than a V-shape as long as the opening edge is tapered. That is, FIG. 3 is a view showing another embodiment of the present invention, and is a view showing a procedure when the overlap portion 17 is formed in the valve spool 3 by another method. That is, in the present embodiment, the width W0 of the first spool land 12 is slightly larger than the land width W1 in advance, and the rectangular groove 32 having a U-shaped cross section is once cut on the peripheral surface 12 thereof by a square bite. By cutting the opening edge into a tapered shape with a chamfering tool (see FIG. 3B), only the opening edge forms a tapered partition groove 31 (see FIG. 3A). Thereafter, by cutting off both sides of the portion beyond the land width W1 across the axis (see FIG. 3C), the overlap portion 17 having a barrel-shaped end surface is formed. In such a case,
At the time when the overlap portion 17 is formed on the first spool land 12, tapered surfaces 31a are respectively formed at opposing edge portions of the general portion 15 and the overlap portion 17. Therefore, the same effect as in the case where the V-shaped section groove 21 shown in FIGS. 1 and 2 is provided can be obtained. In order to reduce the cost of the valve spool 3, it is more advantageous to provide the V-shaped section groove 21 because the number of steps is reduced.

[0015]

As described above, in the valve spool of the present invention, at the time of manufacturing, the edge portion on the overlap portion side in the general portion of the spool land becomes tapered at the time of forming the partition groove, so that barrel polishing is performed. Post processing for the purpose of deburring by shot peening or the like is not required. Therefore, since the land width of the spool land can be managed within the range of the tolerance, the dimensional accuracy can be improved. At the same time, the cost can be reduced by reducing the processing cost. Moreover, it is possible to cope with the case where the surface of the valve spool is made of a relatively soft material such as aluminum, and in that case, the cost can be further reduced. That is, it can be applied to a wide range of materials.

[Brief description of the drawings]

FIG. 1 is an enlarged view showing an end of a valve spool according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG. 1 during the processing of the valve spool.

FIG. 3 is a diagram corresponding to FIG. 2, showing another embodiment of the present invention.

FIG. 4 is a sectional view of a hydraulic control valve showing a conventional technique.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Description of Signs] 2 Valve body 8 to 11 First to fourth oil grooves 12 First spool land 13 Second spool land 15 General portion 17, 18 Overlap portion 21 Partition groove 31 Partition groove W1, W2 Land Width W3, W4 Groove width

Claims (2)

[Claims] Claims: 1. While being accommodated in a valve body,
A spool land having the same land width as the groove width of the groove of the valve body with which the port communicates is provided, and an overlap portion having a shape allowing fluid flow in the port is formed on the spool land. In a valve spool protruding beyond the valve spool, a partition groove is provided between the general portion of the spool land and the overlap portion, and a partition groove having a tapered opening edge is provided between the general portion and the overlap portion. 2. The method according to claim 1, wherein the overlap portion is separated from the general portion by forming the partition groove on a peripheral surface of a spool land having a width larger than the land width in advance. The valve spool according to claim 1, wherein the valve spool is formed in a shape that allows flow.