JP3393719B2 - Spool operation link and mounting method of spool operation link - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spool operating link for operating and controlling a linear spool of a hydraulic control valve and a method for mounting the spool operating link on a base of the hydraulic control valve.

[0002]

2. Description of the Related Art A hydraulic control valve is a valve that is mounted at an appropriate position in a hydraulic circuit to control the pressure, flow rate, and flow direction of oil, and various configurations have been conventionally proposed. As a structure of the hydraulic control valve, a rotary valve using a rotary spool and a linear spool valve that slides on a straight line are well known. Of these, the linear spool valve is suitable for a high-pressure and large-capacity valve because it is easily hydraulically balanced and is widely used. In the linear spool valve, the switching position of each spool is selected by a predetermined spool operation link.

FIG. 9 is a perspective view showing the structure of a spool operation link for operating a hydraulic control valve having two linear spools (hereinafter referred to as a first conventional example). In FIG.
Reference numeral 52 is a base body of the hydraulic control valve 51.
Two spool pipe lines 53 and 54 are provided in parallel with each other. Two linear spools 55 and 56 are inserted into the two spool pipe lines 53 and 54. Spool 55,
The upper side of 56 is bendable wires 57 and 58, and ball joints 59 and 60 are provided at the upper ends of the wires 57 and 58.

Reference numeral 61 indicates a spool operation link. As shown in FIG. 10, the spool operation link 61 has an operation plate 71 in which three grooves 63, 64, 65 are provided on one surface side and an operation lever 66 is erected on the other surface side. 66 is arranged in an operating position such as a driver's seat of the hydraulic machine. The operation plate 71 has a hexagonal shape in which three apexes of a triangular plate are cut off, and the inlets 6 of the groove portions 63, 64, 65 are inserted so that ball joints can be inserted into the cut side surfaces.
3a, 64a, 65a are formed. Then, the ball joint 74 of the fulcrum member 73 is inserted into the groove 65 at the right angle position by the inlet 65.
While inserting from a, the inlet 63 of the groove 63, 64
The ball joints 60 and 59 of the linear spools 56 and 55 are inserted from a and 64a.

By tilting the operation plate 71 with the ball joint 74 of the fulcrum member 73 as the fulcrum, the spool operation link 61 can take nine states (indicated by nine squares) including the neutral position. Is configured. That is, since the operation plate 71 is tilted, one spool can take three positions in the spool pipe line, so that nine hydraulic control states can be obtained by combining two spool positions (3 × 3 = 9). It is possible.

When attaching the spool operation link 61 to the two linear spools 55, 56, the linear spool 5
After inserting 5, 56 into the spool conduits 53, 54 respectively, the wires 57, 58 are bent to insert the ball joints 60, 59 into the groove portions 63, 64 of the operation plate 71, respectively, and the fulcrum member 73 Ball joint 74 with the remaining groove 6
5, the base bolt 73a of the fulcrum member 73 is inserted.
Is mounted in the mounting bolt hole 75 of the base 52.

In FIG. 10, the arranging directions of the grooves 63 and 64 are formed along two sides of the right triangle 77 which are orthogonal to each other, and the groove 65 extends in the substantially central direction of the triangle 77 at the right position of the right triangle 77. The reason why the ball joints 59, 60, 74 are not displaced from their respective installation positions by the operating force of the operating lever 66 in the nine states shown in FIG.

FIG. 12 is a perspective view showing another method (hereinafter referred to as a second conventional method) for attaching the spool operation link to the hydraulic control valve. This method is for each linear spool 8
1,82 ball joints 83,84, fulcrum member 73 ball joint 7
4 are inserted into the groove portions of the spool operation link 61, and then the linear spools 81 and 82 are inserted into the base body 52 of the hydraulic control valve 51 while the base bolt 73a of the fulcrum member 73 is inserted.
Is attached to the base 52.

In the methods of the first and second conventional examples, the linear spools 55, 56 or the linear spool 81,
This is done because the ball joint of each spool cannot be inserted into each groove of the spool operation link 61 in a state after the 82 is inserted into the base body 52 to the normal assembly position.

[0010]

However, the method of the first conventional example has the following problems (1) and (2). (1) Since the tips of the linear spools 55 and 56 must be the bendable wires 57 and 58, the manufacturing cost is high. (2) Since the spool operation link 61 is attached by bending the wires 57 and 58, the attachment work is difficult.

Further, the method of the second conventional example has the following problems (3) and (4). (3) It is necessary to insert the two linear spools 81 and 82 into the spool conduits 53 and 54 at the same time, which makes mounting work difficult. (4) When inspecting the spool operation link 61 and the fulcrum member 73, or the spool operation link 61 and the fulcrum member 7
Whenever the 3 is damaged, the two spools 81 and 82 must be removed from the spool conduits 53 and 54 each time.

In addition to the first conventional example and the second conventional example, the ball joint and the spool body are detachably constructed by screws, and the ball joint is attached to each groove portion of the spool operation link, and then the ball joint. Although a structure in which the screw is attached to the spool body by a screw has been proposed, there is a problem that the number of parts increases, the manufacturing cost rises, and the screw may loosen.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art.
An object of the present invention is to provide a spool operation link and a method for attaching the spool operation link that can simplify the assembling work and reduce the manufacturing cost.

[0014]

A spool operating link according to claim 1 for achieving the above object is, for example, as shown in FIGS.
Explaining with reference to FIGS. 5 and 8, the engaging grooves that engage with the engaging portions of the pair of linear spools arranged at the center distance d, and the right-angled triangular shape with respect to the pair of linear spools. In a spool operating link having an engaging portion of a fulcrum member arranged at a right angle position and an engaging groove for engaging, a right-angled triangle having apexes K, L, M on one surface of the operating plate 2. Considering KLM, when a perpendicular KN is drawn on the side LM facing the right-angled vertex K of the right-angled triangle KLM, a triangle K′L composed of the other two vertices L and M and a point K ′ on the perpendicular KN.
The first engagement groove 6 and the second engagement groove 7 are formed along the two sides K′L and K′M of M, and extend in the substantially central direction of the triangle K′LM at the position of the point K ′. A spool operation link 1 having a third engagement groove 9 and an operation lever 18 attached to a predetermined position on the other surface of the operation plate 2, the first and second engagement grooves 6 and 7 being the linear spool. 21 and 22 engagement part 2
1a, 22a, and the third engaging groove 9 is engaged with the engaging portion 23a of the fulcrum member 23. When the linear spool 21 is positioned, the first engaging groove 6 is formed so that the distance k between the inlet 7a of the second engaging groove 7 and the center of the one linear spool 21 is shorter than the center interval d. It is characterized in that the length x of is set.

A method of mounting the spool operation link according to a second aspect of the present invention will be described with reference to FIGS. 1 to 5, for example.
A pair of spool pipe lines 33, 3 installed in parallel in
4, a pair of linear spools 21 and 22 to be inserted into the spool pipelines 33 and 34, and an inlet side end surface 35 of the spool pipelines 33 and 34, with a predetermined triangular shape 3 for the pair of linear spools 21 and 22. The spool operation link 1 according to claim 1 is attached to a hydraulic control valve 31 having a fulcrum member 23 attached to a predetermined apex position, the fulcrum member 23 is removed from the inlet side end surface 35, and each linear spool 21, 22 is attached. The spool operation path 1 is inserted into the spool conduits 33 and 34 to the normal position, the engagement portion 21a of one spool 21 is inserted to the deepest position of the first engagement groove 6, and the spool operation link 1 is inserted in that state. By rotating, the inlet 7a of the second engaging groove 7 is brought to a position where it abuts on the engaging portion 22a of the other spool 22, the operation of rotating the spool operation link 1 and the other spool. By simultaneously performing the operation of pushing the spool operation link 1 toward the spool 22 side, one spool 21 is moved toward the inner side of the first engaging groove 6 while the other spool 22 is moved toward the inner side of the second engaging groove 7. It is characterized in that it is attached by the procedure of moving from to the inlet 6a side and engaging the engaging portion 23a of the fulcrum member 23 with the third engaging groove 9.

[0016]

According to the spool operation link of claim 1, first
One of the linear spools 21 is provided at the innermost position of the engaging groove 6.
Is located, the length x of the first engaging groove 6 is set so that the distance k between the inlet 7a of the second engaging groove 7 and the center of the one linear spool 21 is shorter than the center interval d. Since the spool operation link 1 is set to one spool 2
It can be rotated around 1. Therefore, with the spools 21 and 22 inserted in the spool conduits 33 and 34 of the base 32 of the hydraulic control valve 31, the spools 21 and 22 are engaged with the first engagement groove 6 and the second engagement groove 7. Therefore, the spool operation link 1 can be attached to the hydraulic control valve 31 very easily.

According to the spool operation link mounting method of claim 2, FIGS. 3 (A) to 3 (C) and 4 (D) to
As shown in (F), the operation of rotating the spool operation link 1 with one spool 21 engaged with the first engagement groove 6 and the spool operation link 1 on the other spool 22 side.
Press at the same time. And the other spool 22
By moving one spool 21 from the inner side of the first engaging groove 6 to the inlet 6a side while moving the inner side of the second engaging groove 7 toward the inner side of the first engaging groove 6. 6,
It can be inserted into a predetermined position of the second engagement groove 7. Therefore, the spool pipe line 3 of the base 32 of the hydraulic control valve 31
With spools 21 and 22 inserted in 3, 34, the first
The spools 21 and 22 can be engaged with the engagement groove 6 and the second engagement groove 7, and the spool operation link 1 can be attached to the hydraulic control valve 31 very easily.

[0018]

As described in the above operation, according to the invention of claim 1, the following peculiar effects can be obtained. (A) Since the spool operation link can be attached with the spool inserted in the base body of the hydraulic control valve, the assembling work becomes extremely simple. (B) The spool operation link and fulcrum member can be easily inspected and replaced when damaged.

(C) Wire the upper part of the spool,
Compared with the conventional structure such as split type spool,
The structure of the spool can be simplified and the manufacturing cost can be reduced. (D) Since it can be performed only by increasing the length of the first engaging groove of the spool operation link, it can be performed at low cost. According to the invention of claim 2, in addition to the effects (a) to (d) of the invention of claim 1, the spool operation link can be assembled by the above-mentioned simple procedure. Therefore, in the assembling work of the hydraulic control valve. It has the unique effect of reducing the burden on the operator and improving the efficiency of the work.

[0020]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. 1A and 1B are views showing a spool operation link according to the present embodiment. FIG. 1A is a plan view and FIG.
A line I arrow view, (C) is a bottom view. FIG. 2 (A) is a perspective view showing a hydraulic control valve to which a spool operation link is assembled, and FIGS. 3 (A) to (C) and FIGS. 4 (D) to (F) respectively show the spool operation link as a spool of the hydraulic control valve. It is a figure which shows the procedure to attach to.

This spool operation link 1 has two sides 4 of a right-angled triangle 3 which are orthogonal to one surface of an operation plate 2 which is a plate-like object.
A first engaging groove 6 and a second engaging groove 7 are formed along the line 5. Further, a third engagement groove 9 extending substantially in the central direction of the right triangle 3 is formed at a right angle position. As shown in FIG. 1 (A), the operation plate 2 has a planar shape obtained by cutting the vertices of a triangle.
It has a square shape. Each of the grooves 6, 7, 9 has an inlet 6a, a side end surface 11, 12, 13 which is a side for cutting off the apex, respectively.
It has 7a and 9a. Although the inlet 9a of the third engagement groove 9 is shown in FIG. 1B, the first engagement groove 6,
The second engagement groove 7 also has similar inlets 6a and 7a. As shown in FIG. 1 (B), each of the grooves 6, 7, 9 is formed by providing a side hole 15 having an arcuate cross section with a taper portion 16 that widens toward the end. On the other surface of the operation plate 2, an operation lever 18 is provided upright in a right triangle 3.

The length x in the longitudinal direction of the first engaging groove 6 is as shown in FIG.
As shown in (A), when the one linear spool 21 is located at the deepest position of the first engaging groove 6, the inlet 7 a of the second engaging groove 7 and the center of the linear spool 21. The distance k between the two is set to be shorter than the center distance d between the pair of linear spools 21 and 22.

As shown in FIG. 2, the hydraulic control valve 31 to which the linear spools 21 and 22 are assembled has two spool pipe lines 33 and 34 which are provided in parallel with the base 32 and two of them. It is provided with two linear spools 21 and 22 to be inserted into the spool conduit and a fulcrum member 23. Ball joints 21a, 21a,
22a is formed. The fulcrum member 23 is attached to the inlet-side end surface 35 of the hydraulic control valve 31. In particular,
The right triangle 3 for the two spools 21 and 22
A mounting bolt hole 25 is provided at a position of the inlet-side end surface 35 that is at a right angle position (see FIG. 1A), and the base bolt 24 of the fulcrum member 23 is detachably mounted in the mounting bolt hole 25. Further, the ball joint 2 is attached to the tip of the fulcrum member 23.
3a is formed.

A procedure for assembling the spool operation link to the hydraulic control valve having the above structure will be described with reference to FIGS. 3 and 4, the engagement grooves 6, 7, and 9 and the ball joint 21 of the linear spools 21 and 22 are shown.
The positions of a and 22a are shown in a cross-sectional view for easy understanding. The fulcrum member 23 is removed from the inlet side end surface 35 of the hydraulic control valve 31, and the two linear spools 21 and 22a are inserted into the spool conduits 33 and 34 to the normal position. Figure 2
Indicates this state. In the state of FIG. 2, the ball joint 21 of the first spool 21.
Insert a into the first engagement groove 6 to the back. FIG. 3 (A) shows this state.

By rotating the spool operation link 1 counterclockwise as shown in FIG. 3 in the state of FIG. 3 (A), the inlet 7a of the second engagement groove 7 as shown in FIG. 3 (C). Is brought to a position where it comes into contact with the ball joint 22a of the second spool 22. At this time, since the distance k is set to be shorter than the center interval d, the ball joint 22a is connected to the inlet 7
It can be inserted from a to the back side. As shown in FIGS. 4D and 4E, by simultaneously performing the operation of rotating the spool operation link 1 counterclockwise and the operation of pushing the spool operation link 1 toward the second spool 22, the second spool 22 The first spool 21 is moved from the inner side of the first engaging groove 6 to the inlet 6a side while being moved to the inner side of the second engaging groove 7.

With the first spool 21 and the second spool 22 positioned substantially at the mounting positions of the first and second engaging grooves 6 and 7, respectively, as shown in FIG. The spool operation link 1 is tilted so that the space between the control valve 31 and the input side end surface 35 is widened, and the ball joint 23a of the fulcrum member 23 is attached to the third engagement groove 9. Then, the base bolt 24 of the fulcrum member 23 is attached to the attachment bolt hole 25 of the oil inlet side end surface 35. By positioning the fulcrum member 23 by mounting it on the input side end surface 35, the first spool 2 in the engagement grooves 6 and 7 is positioned.
The positions of the first and second spools 22 are defined (state of FIG. 4F). With the above procedure, the spool operation link 1 can be easily attached to the hydraulic control valve 31.

In the above description, the spool operation link 1 is tilted so that the space between the third engagement groove 9 and the input side end surface 35 widens, and the ball joint 23a of the fulcrum member 23 is inserted into the third engagement groove 9.
However, the method of attaching the fulcrum member 23 to the third engagement groove 9 is not necessarily limited to this method. As another method, as shown in FIG. 6, the base of the fulcrum member 23 is rotatably supported in the direction in which the third engagement groove 9 is provided with respect to the base 32, and the fulcrum member 23 is rotated. After being inserted into the third engagement groove 9 by doing so, the fulcrum member 23
May be fixed by a predetermined fixing member.
In this case, the structures of the fulcrum member 23 and the input-side end surface 35 are slightly complicated, but when the fulcrum member 23 is attached to the third engagement groove 9, it is not necessary to tilt the spool operation link 1.

[0028]

Second Embodiment FIGS. 7A to 7F are views showing a second embodiment of the present invention. This embodiment is different from the above embodiment in that the first spool 21, the second spool 22, and the fulcrum member 2 are provided.
Only the point where the arrangement position of 3 is an isosceles right triangle.
Therefore, the operation plate 2 of the spool operation link 1 has a hexagonal shape in which the vertices of an isosceles right triangle are cut off. Also in this embodiment, the spool operating link 1 can be rotated between the first spool 21 and the second spool 22 by setting the length of the first engaging groove 6 in the same manner as in the above embodiment. , The installation work to the hydraulic control valve can be simplified.

[0029]

Third Embodiment FIG. 8 is a diagram showing a third embodiment of the present invention. This embodiment is different from the first embodiment only in that the positions of the first spool 21, the second spool 22, and the fulcrum member 23 are predetermined triangles instead of right-angled triangles.

In this spool operation link, a right-angled triangle KLM consisting of vertices K, L and M is considered on the surface of the operation plate 2 in which the engagement groove is formed, and a side LM facing the right-angled vertex K of the right-angled triangle KLM is considered. When the perpendicular KN is drawn, a triangle K'composed of two other vertices L and M and a point K'on the perpendicular KN
The first engaging groove 6 and the second engaging groove 7 are formed along the two sides K′L and K′M of the LM, respectively, and at the position of the point K ′ in the substantially central direction of the triangle K′LM. The extending third engaging groove 9 is formed. The fulcrum member 23 and the first spool 2 are respectively attached to the vertices K, L and M of the right triangle KLM.
The first and second spools 22 are arranged in the configuration of the first embodiment, and the triangle K'LM shown in the third embodiment conceptually includes the right triangle KLM.

In this way, the first engaging groove 6, the second engaging groove 7,
The spool operation link 42 can also be configured by forming each of the third engagement grooves 9. The first
Needless to say, the arrangement positions of the first spool 21, the second spool 22, and the fulcrum member 23 are changed according to the arrangement direction of the third engaging grooves 6, 7, and 9.

The present invention is not limited to the above-described embodiments, but various design changes can be made within the scope of the present invention. For example, as for the shape of the operation plate 2, the positional relationship among the first engagement groove 6, the second engagement groove 7, and the third engagement groove 9 is satisfied, and the spool operation link 1 is arranged between the linear spools 21 and 22. If you can rotate
There is no particular limitation.

[Brief description of drawings]

1A and 1B are diagrams showing a spool operation link according to the present invention, in which FIG. 1A is a plan view, FIG. 1B is a view taken along the line II of FIG. 1A, and FIG.

FIG. 2 is a perspective view showing a hydraulic control valve to which a spool operation link is assembled.

3A to 3C are diagrams showing a procedure for attaching a spool operation link to a spool.

4 (D) to (F) are diagrams showing a procedure for attaching the spool operation link to the spool.

FIG. 5 is a side view showing a procedure for attaching the spool operation link to the spool.

FIG. 6 is a partial vertical cross-sectional view showing another method of attaching the fulcrum member to the third engagement groove.

FIG. 7 is a diagram showing a second embodiment of the present invention.

FIG. 8 is a diagram for explaining the third embodiment of the present invention.

FIG. 9 is a perspective view showing a first conventional example of a spool operation link for operating a hydraulic control valve.

FIG. 10 is a plan view of a conventional spool operation link.

FIG. 11 is a diagram for explaining nine possible states of the spool operation link.

FIG. 12 is a perspective view showing a second conventional method for attaching the spool operation link to the hydraulic control valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spool operation link, 2 ... Operation plate, 3 ... Right triangle, 6 ... First engaging groove, 6a ... Entrance of first engaging groove, 7 ... Second engaging groove, 7a ... Second engaging groove Inlet, 9 ... third engaging groove,
18 ... Operation lever, 21 ... Linear spool, 21a ... Engagement portion of linear spool, 22 ... Linear spool, 22a
... engaging portion of linear spool, 23 ... fulcrum member, 23a ...
Engaging portion of fulcrum member, 31 ... Hydraulic control valve, 32 ... Base body, 3
3, 34 ... Spool conduit, 35 ... Inlet side end surface, d ... Center interval between a pair of linear spools, k ... Distance between inlet of second engaging groove and one linear spool center, x ... First section Length of dowel groove.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16K 31/44-31/62

Claims (2)

(57) [Claims] 1. An engagement groove that engages with an engagement portion of a pair of linear spools arranged at a center interval (d), and is arranged at a predetermined vertex position of a predetermined triangle with respect to the pair of linear spools. In a spool operation link having an engagement portion of an installed fulcrum member and an engagement groove that engages with the fulcrum member, a right-angled triangle consisting of vertices (K) (L) (M) (on one surface of the operation plate (2) ( Considering KLM, right triangle (KL
A perpendicular line (K) to the side (LM) facing the right-angled vertex (K) of M).
N), a triangle (K'L) composed of two other vertices (L) (M) and a point (K ') on the perpendicular (KN).
The first engagement groove (6) and the second engagement groove (7) are formed along the two sides (K′L) (K′M) of M), and the above-mentioned structure is provided at the position of the point (K ′). A spool operation link (1) in which a third engagement groove (9) extending substantially in the center of the triangle (K'LM) is formed and an operation lever (18) is attached to a predetermined position on the other surface of the operation plate (2). ), The first and second engaging grooves (6) (7) are engaged with the engaging portions (21a) (22a) of the linear spools (21) (22), and the third engaging groove (9) The engaging portion (23) of the fulcrum member (23)
It is configured to engage with a), and the first engaging groove (6)
When one of the linear spools (21) is located at the innermost position of the (1), the distance between the inlet (7a) of the second engagement groove (7) and the center of the one linear spool (21) ( A spool operation link characterized in that the length (x) of the first engagement groove (6) is set so that k) is shorter than the center interval (d). 2. A pair of spool conduits (33) (34) installed in parallel in the base body (32), and a pair of linear spools (2) inserted into the spool conduits (33) (34).
1) (22) and a pair of linear spools (21) (2) on the inlet side end surface (35) of the spool conduits (33) (34).
The hydraulic control valve (3) including a fulcrum member (23) attached to a predetermined vertex position of a predetermined triangle (3) with respect to 2).
(1) A spool operation link attachment method for attaching the spool operation link according to claim 1 by the following steps (1) to (3). The fulcrum member (23) is removed from the inlet-side end surface (35), and the linear spools (21) and (22) are inserted into the spool conduits (33) and (34) to the normal position. The engaging portion (21a) of (21) is inserted to the innermost position of the first engaging groove (6), and the spool operating link (1) is rotated in that state to thereby cause the second engaging groove (21). Bringing the inlet (7a) of 7) to the position where it abuts on the engaging portion (22a) of the other spool (22), the operation of rotating the spool operation link (1) and the spool on the other spool (22) side By simultaneously pressing the operation link (1), the other spool (22)
Is moved to the inner side of the second engaging groove (7), one spool (21) is introduced from the inner side of the first engaging groove (6) to the inlet (6
a) of the fulcrum member (23) to the third engaging groove (9).
Engage a).