JPH05612Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a sleeve fixing structure for hydraulic equipment such as hydraulic valves, hydraulic pumps, and hydraulic motors, and is particularly easy to assemble and disassemble. This invention relates to a sleeve fixing structure for hydraulic equipment that is improved so that there is no possibility that the inner diameter of the sleeve will change during assembly.

[Prior art] For example, in hydraulic valves that require highly accurate flow control or complex directional control, it is necessary to form precise or complicated flow paths within the casing. Because of this necessity, many valve chambers are not formed directly in the casing, but rather a sleeve is inserted into the casing and the valve chamber is formed inside the sleeve. In this case, it is necessary to accurately fix the sleeve at a predetermined position within the casing, and various sleeve fixing mechanisms have been proposed for this purpose.

FIG. 3 is a longitudinal sectional view showing an example of a conventional sleeve fixing structure for hydraulic equipment (for example, see Japanese Patent Publication No. 61-57476). A sleeve fitting hole 4 is formed by partitioning one end side of 2 with a plug member 3, and this sleeve fitting hole 4
The sleeve 5 is attached to. This sleeve 5 has one end received by the plug member 3 and the other end received by a spacer 6 fixed to the casing 1. A cover 7 covering one end of the through hole 2 is fixed to one end surface of the casing 1 with a bolt 8. By operating an adjustment screw 9 threaded through the cover 7, the gap between the spacer 6 and the sleeve 5 can be adjusted. The position of the plug member 3 can be adjusted so that there is no play between the sleeve 5 and the plug member 3.
Note that the spool 10 inserted into the sleeve 5
is urged toward the plug member 3 by a spring 11, and a cover 13 to which an adjustment screw 12 for adjusting the urging force of the spring 11 is screwed is fixed to the casing together with the spacer 6 by bolts 14.

FIG. 4 is a longitudinal sectional view showing an example of another conventional sleeve fixing structure for hydraulic equipment.

In this sleeve fixing structure for hydraulic equipment, the sleeve fitting hole 4 is recessed from the other end surface of the casing 1.
One end surface of the sleeve 5 is received by the inner end surface 15 of the sleeve 5, and the other end portion of the sleeve 5 is received by a stopper 16. The stopper 16 is fitted into a hole 19 formed in the peripheral wall of the sleeve fitting hole 4 so as to be able to move forward and backward, and is urged by a spring 17 to move toward the center of the sleeve fitting hole 4. This spring 17 is received by a plug 18 screwed onto the peripheral wall of the sleeve fitting hole 4. Since the distal end of the stopper 16 is tapered, the biasing force of the spring 17 acts to push the sleeve 5 received by the distal end of the stopper 16 toward the inner end surface 15 of the sleeve fitting hole 4. However, no play is created between the sleeve 5 and the inner end surface 15 of the sleeve fitting hole 4.

Although not shown, there is also a sleeve fixing structure for hydraulic equipment in which the sleeve is press-fitted into a sleeve fitting hole in a casing.

[Problem that the invention attempts to solve]

According to the conventional example shown in FIG.
The position of the sleeve 5 is determined using one end surface of the spacer 6 fixed to the other end as a reference, and in order to fix the sleeve 5 at that position, the plug member 3, adjustment screw 9, cover 7, and bolts are required. 8 and a large number of parts are required to secure the sleeve 5. In addition, the assembly and disassembly operations are also complicated and troublesome. Furthermore, it is necessary to make the dimensional accuracy of the spacer 6 highly accurate, which is also disadvantageous in terms of cost reduction.

In the conventional example shown in FIG. 4, the position of the sleeve 5 is determined using the inner end surface 15 of the sleeve fitting hole 4 formed in the casing 1 as a reference, so the depth dimensional accuracy of the sleeve fitting hole 4 is determined. High precision is required, which is disadvantageous in terms of cost reduction.
Also, to fix the sleeve in that position,
Furthermore, a stopper 16, a spring 17, and a plug 18 are required, and a large number of parts are required.
In order to mount these, it is necessary to form a hole 19, at least a portion of which is a screw, in the peripheral wall of the sleeve fitting hole 4. In addition, when assembling the sleeve 5, for example, while pressing the sleeve 5 against the inner end surface 15 of the sleeve fitting hole 4, press the stopper 1.
6. Since the spring 17 and the plug 18 are assembled, the assembly work is complicated, and when disassembling it, the plug 18 must be screwed out, making the work complicated and troublesome.

In the conventional example of press-fitting a sleeve, the inner diameter of the sleeve may change during press-fitting, which is disadvantageous in improving control accuracy and makes it difficult to replace the sleeve for maintenance.

The present invention has been made to eliminate the drawbacks of the conventional example described above, and is very easy to assemble and disassemble, and also eliminates the possibility of changing the inner diameter dimension of the sleeve when assembling the sleeve. The object of the present invention is to provide an improved sleeve fixing structure for hydraulic equipment.

[Means for solving problems]

The sleeve fixing structure for hydraulic equipment according to the present invention is
A sleeve is installed in the sleeve fitting hole in the casing, an elastic body is interposed between the inner end surface of the sleeve fitting hole and the opposing end surface of the sleeve, and an engaging recess is formed in the outer periphery of the sleeve. At the same time, a pin fitting hole is provided in the peripheral wall of the sleeve fitting hole of the casing so as to correspond to the engaging recess, and the sleeve is pushed into the inner end surface of the sleeve fitting hole against the elastic body. The tip of the pin member fitted into the pin fitting hole is engaged with the engagement recess.

The elastic body is particularly limited as long as it has enough elasticity to press the inner end surface of the engagement recess against the pin member with an appropriate pressure when the sleeve is pushed into the sleeve fitting hole to a predetermined position. For example, wave washers, spring washers, rubber, etc. may be used.

The engagement recess may be formed by a circumferential groove formed all around the outer periphery of the sleeve, or may be formed by a groove extending circumferentially over a part of the outer periphery of the sleeve, Furthermore, it may be configured with a conical hole having a larger diameter than the pin member.

The pin member is not particularly limited, but it is advantageous to use a parallel pin (roll pin) so that the position of the sleeve does not change depending on the amount of insertion into the engagement recess.

[Effect]

In the sleeve fixing structure for hydraulic equipment according to the present invention, first, the elastic body is inserted into the sleeve fitting hole, the sleeve is inserted into the sleeve fitting hole, and the sleeve is pressed against the elastic body by, for example, a press. Insert the pin member into the pin fitting hole while pushing it toward the back end of the fitting hole, and then push the pin member until it is engaged with the engagement recess formed on the outer periphery of the sleeve to release the pressing force. do it. Then, the pin member is engaged with the engagement recess, and frictional force is generated between the engagement recess and the pin member and between the pin member and the pin fitting hole, and this frictional force causes the engagement recess of the pin member to And escape from the pin fitting hole is prevented.

In addition, when removing the sleeve from the sleeve fitting hole, push the sleeve against the elastic body using a press or the like to the far end side of the sleeve fitting hole, and press the sleeve between the engagement recess and the pin member and between the pin member and the pin fitting. After releasing the frictional force between the pin member and the hole, the pin member may be removed from the engagement recess and the pin fitting hole to release the pressing force. Then, the sleeve will be pushed out of the sleeve fitting hole to a greater or lesser extent by the elasticity of the elastic body, so all you have to do is grab it and pull it out.

Also, whenever a press is used when inserting a sleeve, this pressing force is much weaker than that of a press-fitting press, and is a weak force that merely counters the elasticity of an elastic body. There is no risk that the inner diameter of the

[Effect of idea]

As described above, according to the sleeve fixing structure for hydraulic equipment according to the present invention, the pin member is inserted and removed while pressing the sleeve against the elastic body against the inner end surface of the sleeve fitting hole, and then the pressing force is released. Since the sleeve can be assembled and disassembled with the simple operation of ., assembly and disassembly are easy, and parts replacement for maintenance is also facilitated.

Further, since the force applied to the sleeve when the sleeve is inserted is weak enough to simply resist the elastic force of the elastic body, there is no fear that the inner diameter of the sleeve will change when the sleeve is inserted.

Furthermore, compared to the conventional example shown in FIG. 3, fewer parts are required to fix the sleeve, and all that is required is to form the pin fitting hole and the engagement recess of the sleeve with high precision when processing the parts. This will be advantageous in reducing costs.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of a regulator valve according to an embodiment of the present invention. This regulator valve 20 is equipped with a casing 21, and concave portions are formed in the casing 21 sequentially and coaxially from one end side. A spring chamber 22 and a sleeve fitting hole 23 are formed. A rear end surface 24 of the sleeve fitting hole 23 is formed in a plane perpendicular to the axis of the sleeve fitting hole 23. A sleeve 25 is inserted into the sleeve fitting hole 23 so as to be movable in the axial direction. An elastic body 27 made of a corrugated washer is interposed between the inner end surface 24 of the sleeve fitting hole 23 and the opposing end surface 26 of the sleeve 25.

An engagement recess 28 consisting of a groove around the entire circumference is formed on the outer periphery of the sleeve 25.
8, a pin fitting hole 29 is transparently provided in the peripheral wall portion 27 of the sleeve fitting hole 23 of the casing 21.

As shown in FIG. 2, the axial distance A from the inner end surface 24 of the sleeve fitting hole 23 to the center of the pin fitting hole 28 is defined as Equal to the sum of the width l ₂ of the portion 30, the thickness t of the elastic body 27 when it is compressed and has an appropriate repulsive force, and the radius d/2 of the pin fitting hole 28. is set (A=l ₂ +t+
d/2). Further, the width l ₁ of the engaging recess 28 is formed to be larger than the diameter d of the pin fitting hole 29.

A roll pin 31 is fitted into the pin fitting hole 29 , and the tip of the roll pin 31 fitted into the pin fitting hole 29 pushes the sleeve 25 into the sleeve fitting hole 23 against the elastic body 27 . When pushed toward the rear end surface 24 side, it is engaged with the engagement recess 28 .

A spool 32 is slidably inserted into the sleeve 25, and the spool 32 is urged toward the inner end surface 24 of the sleeve fitting hole 23 by a spring 33 housed in the spring chamber 22. The biasing force of the spring 33 can be adjusted by an adjustment screw 35 that is threadedly inserted into a cover 34 that covers the open end of the spring chamber 22.

In the regulator valve configured in this way, the sleeve 25 is installed, for example, in accordance with the following procedure.
is incorporated into the casing 21.

That is, the elastic body 27 is inserted into the sleeve fitting hole 23, the sleeve 25 is inserted into the sleeve fitting hole 23, and the sleeve 25 is pushed into the sleeve fitting hole 23 against the elastic body 27 by, for example, a press (not shown).
The pin fitting hole 2 is inserted into the inner end surface 24 side of the
9, the roll pin 31 is pushed in until it is engaged with the engagement recess 28 formed on the outer circumference of the sleeve 25, and the pressing force is released. Then, the roll pin 31 is engaged with the engagement recess 28 , and the roll pin 31 is prevented from coming out of the engagement recess 28 and the pin fitting hole 29 .

Further, in this regulator valve, the sleeve 25 incorporated in the casing 21 can be taken out from the sleeve fitting hole 23, for example, according to the following procedure.

That is, by pressing the sleeve 25 against the elastic body 27 toward the inner end surface of the sleeve fitting hole 23 using a press or the like, the gaps between the engagement recess 28 and the roll pin 31 and between the roll pin 31 and the pin fitting hole 29 are removed. After releasing the frictional force, insert the roll pin 31 into the engagement recess 28.
Then, the pin may be removed from the pin fitting hole 29 and the pressing force may be released. Then, the sleeve 25 is pushed out of the sleeve fitting hole 23 to a greater or lesser extent by the elasticity of the elastic body 27, so it is only necessary to grasp it and pull it out. In this way, the roll pin 31 is inserted and removed while pressing the sleeve 25 against the inner end surface 24 side of the sleeve fitting hole 23 against the elastic body 27.
Then, the sleeve can be assembled and disassembled by a simple operation of releasing the pressing force that presses the sleeve 25 against the rear end surface 24 side of the sleeve fitting hole 23. Therefore, assembly and disassembly are easy, and parts for maintenance can be easily assembled and disassembled. It also becomes easier to replace.

Here, whenever a press is used when inserting or disassembling the sleeve 25, this pressing force is much weaker than the pressing force of a press-fitting press, and is a weak force that merely opposes the elasticity of the elastic body 27. Therefore, when inserting sleeve 25, sleeve 2
There is no possibility that the inner diameter of 5 will change.

Furthermore, compared to the conventional example shown in FIG. 3, fewer parts are required to fix the sleeve 25.
As for parts processing, it is only necessary to form the pin fitting hole 29 and the engaging recess 28 of the sleeve 25 with high precision, which is advantageous in reducing costs.

Incidentally, as the elastic body 27, other than the above, a disc spring, a washer, a rubber plate, etc. can be used.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a regulator valve according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the main parts showing the procedure for assembling and disassembling the regulator valve, and Fig. 3 is a longitudinal cross-sectional view of a conventional hydraulic equipment. FIG. 4 is a longitudinal sectional view of another conventional example of hydraulic equipment. 21... Casing, 23... Sleeve fitting hole, 24... Back end surface, 25... Sleeve, 26...
...End face, 27...Elastic body, 28...Engagement recess, 2
9...Pin fitting hole, 31...Roll pin.

Claims (1)

[Scope of utility model registration request] A sleeve is installed in the sleeve fitting hole in the casing, an elastic body is interposed between the inner end surface of the sleeve fitting hole and the opposing end surface of the sleeve, and an engaging recess is formed in the outer periphery of the sleeve. At the same time, a pin fitting hole is provided in the peripheral wall of the sleeve fitting hole of the casing so as to correspond to the engaging recess, and the sleeve is pushed into the inner end surface of the sleeve fitting hole against the elastic body. A sleeve fixing structure for a hydraulic device, characterized in that a tip end of a pin member fitted into a pin fitting hole is engaged with an engagement recess.