JP2928917B2 - Control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve for controlling the operation of hydraulic equipment such as a regulator, a directional control valve and other valves of a variable displacement pump and a hydraulically operated clutch.

[0002]

2. Description of the Related Art In construction machines such as hydraulic excavators,
A special operation may be performed on a specific attachment in addition to a normal operation. That is, in the case of a mini-excavator as a construction machine, when a discharge plate is used as an attachment, a special floating operation is performed on the discharge plate in addition to the normal up-down operation (during this floating operation, the hydraulic cylinder mechanism expands and contracts). Is held in a free state, and therefore, the earth discharging plate connected to the hydraulic cylinder mechanism may be moved up and down along irregularities on the ground). When such a mini excavator is operated by remote control, the special floating operation is a work operation that is not normally performed by a control valve as a remote control valve. It must be prevented from being operated.

As a control valve for performing such an operation, for example, a control valve shown in FIG. 6 is known. With reference to FIG. 6, this known control valve includes a valve housing main body 2 and an upper housing 4 provided at an upper end of the valve housing main body 2. The valve housing body 2 is provided with a spring chamber 6 and a spool hole 8, and a spool 10 is slidably mounted in the spool hole 8. A plug member 10 is mounted on the upper end of the spring chamber 6.
The push rod 12 is mounted on the push rod 12. A spring receiving member 14 is mounted in the spring chamber 6, and a first spring 16 is provided between the spring receiving member 14 and the valve housing body 2.
, And a second spring 18 is interposed between the spring receiving member 14 and the spool 10. First spring 16
Biases the push rod 12 upward through the spring receiving member 14, and the second spring 18 biases the spool 10 downward with respect to the push rod 12. A cam member 20 for pressing the push rod 12 is provided on the upper housing 4.
The cam member 20 is fixed to a support shaft 22 rotatably supported by the upper housing 4. An operation lever 23 is attached to the cam member 20. By operating the operation lever 23, the cam member 2 is moved.
0 is rotated.

[0004] The control valve is provided with a detent force applying mechanism 24 for applying a detent force. The detent force applying mechanism 24 has a sleeve member 26 screwed to the upper housing 4, and a detent force applying member 28 is slidably mounted on the sleeve member 26. A cap member 30 is screwed onto one end of the sleeve member 26, and the cap member 30 and the detent force applying member 28
And a coil spring 32 that biases the detent force applying member 28 toward the cam member 20 is interposed. The detent force applying mechanism 24 includes a detent force applying action surface 34 provided on one surface of the cam member 20, and the detent force applying action surface 34 is provided with a neutral detent recess 36 and a detent recess 38.

[0005] An operating force sudden change mechanism 40 is provided in association with one of the spools 10 (the spool on the right side in FIG. 6). The known operating force sudden change mechanism 40 has a hollow sleeve 42 slidably mounted in the spring chamber 6,
One end of the hollow sleeve 42 is provided with an inner flange 44 projecting inward in the radial direction. Spring receiving member 1
4 is slidably received in the hollow sleeve 42, and the inner flange 44 of the hollow sleeve 42 and the valve housing body 2
An operating force spring 46 is interposed between the operating force spring 46 and a part thereof.

In this known control valve, when the operating lever 23 is turned in a direction indicated by an arrow 48, the operating lever 2 is rotated.
3, the cam member 20 is rotated. So,
The push rod 12 (the right one in FIG. 6) is pressed downward by the cam member 20, and the spool 10 is moved downward by the action of the second spring 18. When the operation lever 23 is rotated to the vicinity of the detent position, the spring receiving member 14 moved via the cam member 20 and the push rod 12 comes into contact with the inner flange 44 of the hollow sleeve 42. When the operating lever 23 is further rotated from this state, the hollow sleeve 42 is moved with the movement of the spring receiving member 14, and the movement of the hollow sleeve 42 causes the operating force spring 46 to be added to the operating force spring 16. Compression, which increases the operating force. When the operation lever 23 is rotated to the detent position in this manner, the detent force applying member 28 of the detent force applying mechanism 24 engages with the detent concave portion 38 of the cam member 20, thereby holding the operation lever 23 at the detent position. Is done. As described above, in this control valve, when the operation lever is rotated to the vicinity of the detent position, the operation force of the operation lever 23 increases, and the operator who operates the control valve increases the operation force of the operation lever 23 by increasing the operation force. Has operated to the vicinity of the detent position.

[0007]

However, the conventional control valve has the following problems to be solved.
That is, as understood from FIG. 6, the springs 16 and 18 for moving the hollow sleeve 42, the spring receiving member 14, and the spool 10 in the spring chamber 6 of the valve housing body 2.
(The spring 16 works to return the spool upward,
Since the structure is also provided with the operating force spring and the operating force spring 46, there is a problem that the configuration related to the spring chamber 6 becomes complicated. In addition, since the springs 16 and 18 for moving the spool 10 and the spring 46 for operating force are provided in the spring chamber which is a relatively small space,
It is difficult to use a spring having a large spring force as the operating force spring 46. Therefore, there is a limit to the force that can be set as the operating force, and it is difficult to greatly change the operating force rapidly. In connection with this, in a control valve in which the operation lever 23 is relatively long and can obtain a large rotating power with a small force, the compression of the operation force spring 46 by the movement of the spring receiving member 14 is sufficient. It is difficult to obtain a large amount of change in the operating force, and it is difficult for the operator to sense that the operation has shifted from the normal operation range to the special operation range.

It is an object of the present invention to provide a control valve having a relatively simple structure and capable of rapidly increasing the operating force when moving from a normal operation range to a special operation range.

[0009]

SUMMARY OF THE INVENTION The present invention provides a valve housing body having a spring chamber and a spool hole communicating therewith, a spool movably mounted in the spool hole,
A cam member for operating the spool, an operation lever for rotating the cam member, a spring member disposed in the spring chamber for biasing the spool toward the cam member, and In a control valve including a detent force applying mechanism for applying a detent force, and an operating force sudden change mechanism for abruptly changing the operating force of the operating lever, the detent force applying mechanism may be a part of the cam member. A detent force providing action surface having a detent concave portion provided corresponding to the detent position, and a detent force providing member for providing a detent force by acting on the detent force providing action surface, The operating force sudden change mechanism is provided on another part of the cam member,
An operation force application surface having an operation force sudden change projection for rapidly increasing the operation force, and an operation force application member for applying an operation force by acting on the operation force application surface, The control valve is characterized in that, when the operation lever is operated to rotate the cam member, the operation force applying member rides on the operation force sudden change protruding portion of the operation force applying operation surface.
According to the present invention, the cam member for operating the spool is provided with the detent force applying surface of the detent force applying mechanism and the operating force applying surface of the operating force sudden change mechanism. The structure of the operating force applying mechanism can be simplified in relation to the cam member. Further, the operation force applying action surface has an operation force sudden change projection, and the operation force of the operation lever changes when the operation force application member rides on the operation force sudden change projection. Therefore, by increasing the height of the operation force sudden change projection, the operation force of the operation lever changes rapidly, and it is possible to obtain a sufficient change in the operation force that can be easily perceived by the operator. it can.

Further, the present invention is characterized in that when the operation lever is at the detent position, the detent force applying member is engaged with the detent concave portion, and the operation is performed immediately before the detent force applying member is engaged with the detent concave portion. It is characterized in that a force applying member rides on the operation force suddenly changing projection on the operation force applying action surface. According to the present invention, the detent force applying action surface of the cam member has a detent recess provided corresponding to the detent position of the operation lever, and when the operation lever is at the detent position, the detent force applying member applies the detent force. Engage with the detent recess in the working surface. Then, immediately before the detent force applying member engages with the detent recess, the operating force applying member is configured to ride on the operating force suddenly changing projection. Therefore, when shifting from the normal operation range to the detent position, which is a special operation range, the operation force of the operation lever is rapidly changed by the action of the operation force imparting member and the operation force sudden change projection, whereby the operator can: It can be easily sensed that the operation lever has been operated to the vicinity of the detent position.

Further, in the present invention, the operating force applying surface is provided on one side of the cam member, and the detent force applying surface is provided on the other side, and the operating force applying member is provided with the operating force applying surface. An operating force acting position acting on the acting surface;
The detent force acting position where the detent force imparting member acts on the detent force imparting action surface is substantially point symmetric with respect to the width direction center of the rotation center axis in the cam member width direction, and The operating force imparting surface and the detent force imparting surface are provided substantially perpendicular to an operating axis connecting the operating force imparting position and the detent force imparting position.
According to the present invention, the operating force acting position at which the operating force imparting member acts on the operating force imparting action surface and the detent force acting position at which the detent force imparting member acts on the detent force imparting action surface are determined in the width direction of the cam member. The operation force application surface and the detent force application surface are arranged substantially symmetrically about the center of the rotational center axis in the width direction, and the operation force application surface and the detent force application surface connect the operation force application position and the detent force application position. Since it is provided substantially perpendicular to the axis, the detent force applied to the cam member from the detent force applying member and the operating force applied to the cam member from the operating force applying member are mutually reciprocal in the direction of the acting axis. These forces act in a direction to cancel each other, and these forces act on the cam member as a couple, and the cam member 20 and the upper housing 40 rub against each other to generate a frictional force, which impairs the operation feeling. There is no.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a control valve according to the present invention will be described below with reference to the accompanying drawings. FIG.
FIG. 2 is a cross-sectional view showing one embodiment of a control valve according to the present invention.

In FIG. 1, the control valve shown in FIG.
The upper housing 104 is attached to the upper surface of the valve housing main body 102 shown in FIG. A pair of spring chambers 106 and 108 are provided on the upper portion of the valve housing body 102 at intervals in the left-right direction in FIG.
The lower part is provided with spool holes 110 and 112 corresponding to the spring chambers 106 and 108, respectively.
The spool holes 110 and 112 are respectively provided in the spring chambers 10.
6, 108, and their inner diameters are
108 is set smaller than the inner diameter. Spool holes 110 and 112 have spools 114 and 11 respectively.
1 is mounted movably in the vertical direction in FIG. 1, and one end (upper end) of each of the spools 114 and 116 is attached to the spring chamber 10.
6,108. The spools 114 and 116 have substantially the same configuration.
14 will be described.

A first spool portion 118 is provided at the other end (lower end) of the spool 114 (116), and a second spool portion 120 is provided at an intermediate portion thereof. An annular cutout groove 122 is formed between 118 and the second spool 120. In the present embodiment, the outer diameter of the second spool 120 is set to be slightly larger than the outer diameter of the first spool 118. On the other hand, the spool hole 110 (112) has a first hole portion 124 having an inner diameter corresponding to the outer diameter of the first spool portion 118.
And a second hole 126 having an inner diameter corresponding to the outer diameter of the second spool 120, wherein the inner diameter of the second hole 126 is set to be larger than the inner diameter of the first hole 124. . First spool portion 11 of spool 114 (116)
8 is a first hole 124 of the spool hole 110 (112).
Slidably supported by the spool 114
(116) is guided in the first hole 124 and moved in the vertical direction. The second spool 120 is slidably received in the second hole 126 of the spool hole 110 (112) by the vertical movement of the spool 114 (116), and is guided by the second hole 126. .

In this embodiment, the valve housing body 10
A first chamber 1 as a pressure port is provided in a substantially lower central portion of the second chamber 1.
28 are provided. The first chamber 128 extends in the left-right direction in FIG. 1 and communicates with the first holes 124 of the spool holes 110 and 112. The first chamber 128 is connected to a pressure oil supply source (not shown) such as a hydraulic pump via a primary flow path 130 provided in the valve housing body 102, and the pressure from the pressure oil supply source is provided. Oil is supplied to the first chamber 128 through the primary channel 130. In the lower part of the valve housing main body 102, there are provided secondary side flow paths 132, 134 that are switched and controlled by spools 114, 116. One secondary side flow path 132 is provided in the spool hole 1
10 and the first of the spool holes 110 is provided.
Is connected between the hole 124 and the second hole 126. The secondary flow path 132 is connected to, for example, one pilot port of a main operation valve (not shown). Also,
The other secondary flow path 134 is provided in association with the other spool hole 112 and is connected between the first hole 124 and the second hole 126 of the spool hole 112. The secondary flow path 134 is connected to, for example, the other pilot port of the main operation valve (not shown).

A second chamber 136 as a tank port is provided at a substantially upper central portion of the valve housing body 102. The second chamber 136 extends in the left-right direction in FIG. 1 and communicates with the pair of spring chambers 106 and 108.
The second chamber 136 is connected to an oil tank (not shown) via a tank flow path 138 formed in the valve housing body 102, and the pressure oil in the second chamber 136
It is returned to the oil tank through 38.

In this embodiment, the spool holes 110, 1
12 are provided with oil chambers 140 and 142 at one end thereof.
40 and 142 are connected to the second chamber 136 via a communication hole 144 formed in the valve housing body 102. Therefore, the pressure in the oil chambers 140 and 142 is substantially equal to the pressure of the pressure oil in the second chamber 136, that is, the pressure in the tank flow path, and one end surfaces of the spools 114 and 116 (the oil chambers 140 and 142). Pressurized oil does not substantially act on the end face facing the front end). In addition, a sleeve member 146 is attached to the communication hole 144, and the communication hole 144 and the first chamber 128 are partitioned by the sleeve member 146.

Plug members 150 and 152 are mounted on upper ends of the spring chambers 106 and 108, respectively. The push members 154 and 152 are connected to the plug members 150 and 152, respectively.
156 are slidably mounted and each push rod 15
4, 156 are guided by the rod holes of the plug members 150, 152 and are vertically movable in FIG. One ends (upper ends) of the push rods 154 and 156 penetrate the plug members 150 and 152 and protrude upward, and these protruding ends are formed in a hemispherical shape. The other ends (lower ends) of the push rods 154 and 156 are connected to the spring chamber 1.
06, 108, and each projecting end is provided with a flange 158, 160 projecting outward in the radial direction.
52 is set larger than the inner diameter of the rod hole. Therefore, the push rods 154, 156 do not move upward beyond the raised position shown in FIG. 1 due to the flanges 158, 160 abutting on the plug members 150, 152.

Spring receiving members 162, 164 are further mounted on the spring chambers 106, 108 so as to be movable in the vertical direction in FIG. Spring receiving members 162, 164
Is a short cylindrical shape, and a first spring 166 is provided between the spring receiving members 162 and 164 and a part of the valve housing body 102 (a wall defining the lower surfaces of the spring chambers 106 and 108).
168 are interposed. Also, the first spring 166,1
68 radially inward, the spring receiving members 162, 1
64 and the second spool portion 12 of the spools 114 and 116
The second springs 170 and 172 are interposed between the second springs 170 and 172. These first and second springs 166, 168, 1
70, 172 are formed from coil springs,
66, 168 elastically bias the spring receiving members 162, 164 relatively upward with respect to the valve housing body 102 (acting as spool members biasing the spools 114, 116 toward a cam member described later). The second springs 170, 172 elastically bias the spools 114, 116 relatively downward with respect to the spring receiving members 162, 164. At the other end of the push rods 154 and 156, the accommodation recesses 1 corresponding to the spools 114 and 116 are provided.
74, 176 are provided, and the accommodation recesses 174, 176 extend upward in the axial direction from the other end surfaces of the push rods 154, 156. One end of the spool 114, 116
As shown in FIG. 1, push rods 154 and 156 pass upward through holes formed in spring receiving members 162 and 164.
The locking plates 182, 184 are mounted inside the heads 178, 180 provided at the protruding ends.

With this configuration, the first spring 16
6, 168 biases spring receiving members 162, 164 and push rods 154, 156 upward, and push rods 154, 156 have their flanges 158, 160.
Is held at the above-mentioned raised position by contacting the plug members 150 and 152. Also, the second springs 170, 1
72 biases the spools 114, 116 downward, i.e., away from the push rods 150, 152;
As a result, the spools 114 and 116
8 and 180 contact the spring receiving members 162 and 164 via the locking plates 182 and 184, respectively.
Are held in the non-operating position shown in FIG. Spools 114 and 11
6 is in the non-operation position, the first spool portions 118 thereof are located in the first holes 124 of the spool holes 110 and 112 so that the first chamber 128 and the secondary flow path 13
2 and 134 are cut off. At this time, spool 1
The second spool portion 120 of the spring chamber 10
6, 108, the notch groove 122 of the spool 114, 116 and the notch 120a of the second spool portion 120
The second chamber 136 communicates with the secondary-side flow passages 132 and 134 via the.

In the upper housing 104, a cam member 190 for pressing the push rods 154 and 156 is provided. The cam member 190 has a block shape,
A shaft member 192 is fixed to a substantially central portion by a fixing screw 194, and the shaft member 192 is rotatably supported by the upper housing 104. A mounting member 198 is mounted on an upper end surface of the cam member 190 by a pair of mounting screws 196, and a lower end of the operation lever 200 is screwed to the mounting member 198. Therefore, the operation lever 200
Is operated in the direction indicated by the arrow 202, the cam member 190
Is rotated clockwise in FIG.
In the case of 0, the lower right surface acts on one push rod 154 to press it downward. On the other hand, the operation lever 200
Is operated in the direction indicated by the arrow 204, the cam member 190
Is rotated counterclockwise in FIG.
, The lower left surface acts on the other push rod 156 to press it downward. The upper housing 104
Between the mounting member 198 and the rubber protective cover 20
6 is mounted.

In this embodiment, one side of the cam member 190,
In FIG. 1, a detent force applying mechanism 208 is provided on the right side. The illustrated detent force applying mechanism 208 includes a part of the cam member 190, a detent force applying surface 210 provided on the right side surface in FIG. 1, and a detent force applying member 212 acting on the detent force applying surface 210.
Contains. The detent force applying surface 210 extends in an arc around a rotation center axis of the cam member 190 (extending in a direction perpendicular to the paper surface through a point P in FIGS. 1 to 3). This detent force applying surface 210
A neutral detent recess 214 is provided at the center of the arc direction corresponding to the neutral position (the position shown in FIG. 1) of the operation lever 200, and at one end in the arc direction (upper end in FIG. 1), A detent recess 216 is provided corresponding to the detent position of the operation lever 200 (the position shown in FIG. 3). The neutral detent concave portion 214 and the detent concave portion 216 are formed from V-shaped grooves, and the depth of the detent concave portion 216 is equal to that of the neutral detent concave portion 214 so that the detent force at the detent position is larger than the detent force at the neutral position. It is deeper than the depth. As can be easily understood, the magnitude of the detent force can be changed by adjusting the depths of the neutral detent recess 214 and the detent recess 216.

A hollow sleeve member 220 is screwed to the right wall 218 of the upper housing 204.
The detent force giving member 212 is movably mounted on the reference numeral 20. The sleeve member 220 has a nut portion 220
a is provided integrally, and the sleeve member 220 is mounted at a required position by abutment of the nut portion 220a with the right wall 218. Sleeve member 220
A male thread is provided at one end (an end protruding from the right wall 218), and the positioning nut 22 is attached to the male thread.
2 and the adjustment cap 224 are screwed into the adjustment cap 22.
A coil spring 226 that elastically biases the detent force applying member 212 toward the cam member 190 is interposed between the end wall 224a of the fourth member 4 and the detent force applying member 212. The detent force applying member 212 is formed of a cylindrical member, and a spherical portion 212a is provided at the tip thereof.

Since the detent-force applying mechanism 208 is configured as described above, the detent-force applying member 212 is biased toward the cam member 190 by the action of the coil spring 226, and the spherical portion 212a at the distal end thereof is moved to the detent-force applying surface. 210 is elastically pressed. When the operation lever 200 is at the neutral position, as shown in FIG. 1, the spherical portion 212a of the detent force applying member 212 is
4 and when in the detent position, FIG.
As shown in the figure, the spherical portion 212a engages with the detent concave portion 216 of the detent force applying surface 210. Further, when the positioning nut 222 and the adjustment cap 224 are rotated in the mounting direction (or in the detaching direction), the compressive force applied to the coil spring 226 increases (or decreases), whereby the detent force obtained by the detent force applying mechanism 208 is reduced. It becomes larger (or smaller), and thus the detent force can be adjusted by simply rotating the locating nut 222 and the adjustment cap 224.

Further, an operation force sudden change mechanism 230 is provided on the other side of the cam member 190, that is, on the left side in FIG. The illustrated operation force sudden change mechanism 230 includes another part of the cam member 190, an operation force application surface 232 provided on the left side surface in FIG. 1, and an operation force application member 234 acting on the operation force application surface 232. Contains. Operation force imparting action surface 23
Reference numeral 2 extends in an arc shape around the rotation center axis of the cam member 190. The operation force imparting surface 232 has an operation force sudden change protruding portion 236 at one end in the arc direction (lower end in FIG. 1) corresponding to the vicinity of the detent position (the position shown in FIG. 3) of the operation lever 200. The operation force sudden change protruding portion 236 extends to one end of the operation force application surface 232. As will be understood from the following description, by increasing (or decreasing) the height of the operation force suddenly changing projection 236, the degree of sudden change in the operation force can be increased (or decreased).

The operating force applying member 234 has substantially the same configuration as the detent force applying member 212 of the detent force applying mechanism 208. Mounted on wall 238. That is, the hollow sleeve member 240 is screwed to the left wall 238 of the upper housing 204, and the operating force imparting member 23
4 is movably mounted. An external thread is provided at one end (an end protruding from the left wall 238) of the sleeve member 240, and a positioning nut 242 is provided at the external thread.
And the adjustment cap 244 are screwed into the adjustment cap 244.
Between the operating force applying member 234 and the operating force applying member 234.
A coil spring 246 that elastically biases the spring 34 toward the cam member 190 is interposed. Operation force applying member 234
Is composed of a cylindrical member, and a spherical portion 2
34a are provided.

Since the operating force applying mechanism 230 is configured as described above, the operating force applying member 234 is biased toward the cam member 190 by the action of the coil spring 246, and the spherical portion 246a at the distal end of the operating force applying member 234 is operated. 232 is elastically pressed. When the operation lever 200 is rotated to the vicinity of the detent position, as shown in FIG. 2, the spherical portion 246a rides on the operation force suddenly changing protrusion 236 of the operation force applying action surface 210, and the coil is moved when the operation lever 200 is raised. Spring 2
46 is greatly compressed, whereby the operating lever 200
Operating force increases rapidly. The positioning nut 24
When the second and the adjustment cap 244 are rotated in the mounting direction (or detaching direction), the compressive force applied to the coil spring 246 increases (or decreases), whereby the operating force obtained by the operating force applying mechanism 230 increases (or increases). Operating force can be adjusted by simply rotating the positioning nut 222 and the adjusting cap 224.

Next, with reference to FIG. 1 and FIGS. 2 to 4, the operation torque when operating the above-described control valve will be described. FIG. 2 is a partial cross-sectional view showing a state when the operation lever is turned to the vicinity of the detent position, and FIG. 3 is a cross-sectional view showing a state when the operation lever is turned to the detent position. FIG. 4 is a diagram illustrating a relationship between an operation angle of an operation lever and an operation torque.

In the neutral position shown in FIG. 1, the detent force applying member 212 of the detent force applying mechanism 208 is engaged with the neutral detent concave portion 214 of the detent force applying operation surface 210 of the cam member 190. In this neutral position, the push rods 154 and 156
66 and 168 are held in the raised position shown in FIG.
It is held in the inoperative position shown in FIG. 1 by the action of 0,172.

When the operating lever 200 is rotated from the neutral position in the direction shown by the arrow 202, the operating force of the operating lever 200, in other words, the operating torque changes as shown by the solid line A in FIG. That is, when the operation lever 200 starts rotating, the spherical portion 212 of the detent force applying member 212
a is detached from the neutral detent recess 214, and at the time of this detachment, a neutral detent force having a moderate magnitude corresponding to the size of the neutral detent recess 214 is generated, and the operation of the operation lever 200 is performed by the neutral detent force. The torque increases. This neutral detent force is controlled by the operation lever 20.
0 acts as a force for holding the neutral position.

When the operating lever 200 is further rotated in the direction indicated by the arrow 202, the operating torque of the operating lever 200 gradually increases somewhat according to the amount of rotation of the operating lever 200.
This is because when the operation lever 200 is rotated, the cam member 19 is rotated.
0 acts on the push rod 154 to cause the first spring 166
By pressing downward against the biasing action of When the push rod 154 is moved downward, the spring receiving member 1
62 is also moved downward, thereby causing the second spring 170
The spool 114 is moved downward via. When the spool 114 moves in this manner, the second spool 120
Is located in the second hole 126 of the spool hole 110 to block communication between the secondary flow path 132 and the second chamber 136, while the notch groove 122 of the spool 114 is The side flow path 132 is communicated. Therefore, the pressure oil from the pressure oil supply source (not shown) is sent to one pilot port of the main operation valve (not shown) through the primary flow path 130, the first chamber 128, and the secondary flow path 132. And the main operating valve is switched.

When the operating lever 200 is further rotated in the direction indicated by the arrow 202 to the vicinity of the detent position, the operating torque of the operating lever 200 rapidly increases. Operation lever 2
2 is rotated to the vicinity of the detent position, that is, immediately before the detent position, as shown in FIG.
The operation force imparting member 234 of 0 is mounted on the operation force sudden change projection 236 of the operation force imparting operation surface 232 of the cam member 190. When the operation force sudden change projection 236 is climbed, the operation torque is suddenly increased. The operator increases the operation lever 200
Can be easily sensed as having entered the special operation area, that is, having rotated to just before the detent position.

When the operating lever 200 is further rotated in the direction indicated by the arrow 200, the operating torque of the operating lever 200 sharply decreases, and the operating lever 200 is held at the detent position shown in FIG. When the operation lever 200 is rotated as described above, the detent force applying member 212 of the detent force applying mechanism 208 causes the detent force applying action surface 21 to move.
In this engagement, the operating torque of the operating lever 200 is sharply reduced. When the detent force providing member 212 and the detent recess 216 engage in this manner, the operation lever 200 is held at the detent position, in other words, in the special operation area, by the detent force generated by the detent providing member 212 and the detent recess 216. You.

When the operating lever 200 is rotated from the detent position to the neutral detent position in the direction shown by the arrow 204 (FIG. 1), the operating torque of the operating lever 200 changes as shown by a broken line B in FIG. . As can be easily understood from the above description, when the operation lever 200 is rotated from the detent position, the detent force applying member 212
A relatively large detent force is generated when escapes from the detent recess 216, and at this time, the operation torque of the operation lever 200 increases. Thereafter, when the operation lever 200 is slightly rotated, the operation force applying member 234 is disengaged from the operation force sudden change protruding portion 236. When the operation lever 200 is disengaged, the operation force applying member 234 causes the cam member 190 to rotate in the direction indicated by the arrow 204. The power is actuated, which causes the operating lever 2
00 escapes from the special operation area. Operation lever 200
Is further rotated, the push rod 154 is raised by the rotation of the operation lever 200, and the compression force of the first spring 166 is gradually released, so that the operation force of the operation lever 200 is turned in the direction indicated by the arrow 204. Decrease gradually according to the momentum. When the operation lever 200 is rotated to the neutral position, the detent force applying member 212 engages with the neutral detent concave portion 214, whereby the operation torque of the operation lever 200 decreases, and the operation lever 200 is held at the neutral position. You.

When the operating lever 200 is rotated from the neutral position in the direction indicated by the arrow 204, the operating torque increases to some extent when the detent force applying member 212 comes off the neutral detent recess 214 as described above. The operation torque gradually increases in accordance with the amount of rotation of the operation lever 200. When the operating lever 200 is pivoted, the cam member 190 acts on the other push rod 156 to cause the first
The spring 116 is pressed downward against the biasing action of the spring 168, and the spring receiving member 164 is also moved downward at the same time, whereby the spool 116 is moved downward via the second spring 172. When the other spool 116 moves in this way,
The second spool portion 120 is located in the second hole portion 126 of the spool hole 112, and the secondary side flow path 134 and the second chamber 13
6, the cut-out groove 1 of the spool 116 is cut off.
22 communicates the first chamber 128 with the secondary flow path 134. Therefore, the pressure oil from the pressure oil supply source (not shown) is supplied to the primary flow path 130, the first chamber 128, and the secondary flow path 1
It is fed through 34 to the other pilot port of the main control valve (not shown), and the main control valve is switched in the opposite direction.

The control valve described above also has the following features as understood from FIG. That is, since the configuration of the detent force applying member 212 and the components related thereto and the operation force applying member 234 and the components related thereto are substantially the same, these various components can be used as common components. The manufacturing cost of the valve can be reduced. Further, the detent force can be adjusted by rotating the adjusting cap 224 of the detent force applying mechanism 208, and the operating force can be adjusted by rotating the adjusting cap 244 of the operating force applying mechanism 230. .

Further, in the control valve of this embodiment, as shown in FIG. 1, the detent force applying member 212 of the detent force applying mechanism 208
Detent force acting position Q acting on 0 (FIGS. 1 and 2)
Operating force applying member 23 in operating force applying mechanism 230
The operation force acting position R (FIGS. 1 and 2) at which the operation force 4 acts on the operation force applying surface 232 is in the width direction of the cam member 190 (FIG. 1).
(In the direction perpendicular to the plane of FIG. 2 in FIG. 2), the action axis S connecting the detent force action position Q and the operation force action position R is defined by the rotation center axis P of the cam member 190. As shown, these operating positions Q, R
Are provided facing each other. Therefore, the detent force acting on the cam member 190 from the detent force applying member 212 and the operating force acting on the cam member 190 from the operating force applying member 234 act on the cam member 190 so as to cancel each other, and The generation of a couple for rotating the member 190 is avoided.

When the detent force acting position in the detent force imparting mechanism and the operating force acting position in the operating force imparting mechanism are shifted in the width direction of the cam member in relation to some of the components of the control valve. Is desirably configured as shown in FIG. In FIG. 5, the same members as those of the embodiment of FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 5, the detent force applying mechanism 20
8 is located on one side (lower side in FIG. 5) of the cam member 190 in the width direction, the operation force application position R in the operation force applying mechanism 230
Is desirably provided on the other side in the width direction of the cam member 190 (the upper side in FIG. 5). An action axis S connecting the detent force action position Q and the operation force action position R
However, it is desirable that the cam members 190 be arranged substantially point-symmetrically with respect to the center in the width direction of the rotation center axis P (the center in the width direction of the cam member 190). In addition, the detent force application surface 210 on which the detent force application member 212 operates and the operation force application surface 232 on which the operation force application member 234 operates
Is preferably provided so as to be substantially perpendicular to the working axis S. With this configuration, the detent force applied to the cam member 190 from the detent force applying member 212 is converted into a first component force parallel to the operation axis S and a second component force parallel to the detent force application surface 210. The operating force applied from the operating force applying member 234 to the cam member 190 is disassembled into a first component parallel to the operating axis S and a second component parallel to the operating force applying surface 232. Then, the first component force of the detent force and the first component force of the operating force acting in the direction of the action axis S act so as to cancel each other, and the action direction is changed to the action axis S.
Therefore, no couple is generated in the cam member 190 to rotate it.

Although the embodiment of the control valve according to the present invention has been described above, the present invention is not limited to such an embodiment, and various changes and modifications can be made without departing from the scope of the present invention. is there.

For example, in the illustrated embodiment, a detent recess 216 is provided at one end of the detent force applying surface 210 of the cam member 190, and when the operation lever 200 is rotated in the direction indicated by the arrow 202, the operation lever 200 is moved to the detent position. , But without being limited to this,
The operation lever 200 can be configured to be held at the detent position even when rotated in the direction indicated by the arrow 204. In this case, the detent force giving action surface 2
A detent recess is added to the other end of FIG. 10 (the lower end in FIG. 1), and a sudden change in the operating force is required at the other end (the upper end in FIG. 1) of the operating force application surface 232. I just need.

Further, for example, a detent force applying mechanism 208 is provided on one side of the cam member 190, and an operating force applying mechanism 230 is provided on the other side. However, the effects of the detent force and the operating force are particularly problematic. If not, the detent force applying mechanism 208 and the operating force applying mechanism 230 may be arranged in parallel on one side or the other side of the cam member 190.

[0043]

According to the control valve of the first aspect of the present invention, the cam member for operating the spool is provided with the detent force applying surface of the detent force applying mechanism and the operating force applying surface of the operating force sudden change mechanism. Since it is provided, the structure of the operating force applying mechanism can be simplified in relation to the cam member for applying the detent force. Further, the operation force applying action surface has an operation force sudden change projection, and the operation force of the operation lever changes when the operation force application member rides on the operation force sudden change projection. Therefore, by increasing the height of the operation force sudden change projection, the operation force of the operation lever changes rapidly, and it is also possible to adjust the operation force from the outside, so that the operator can easily sense it. Thus, it is possible to obtain a sufficient and optimal change in the operating force.

According to the control valve of the second aspect of the present invention,
The detent force applying surface of the cam member has a detent recess provided corresponding to the detent position of the operation lever, and when the operation lever is at the detent position, the detent force applying member is in the detent recess of the detent force applying surface. Engage. Then, immediately before the detent force applying member engages with the detent recess, the operating force applying member is configured to ride on the operating force suddenly changing projection. Therefore, when shifting from the normal operation range to the detent position, which is a special operation range, the operation force of the operation lever is rapidly changed by the action of the operation force imparting member and the operation force sudden change projection, whereby the operator can: It can be easily sensed that the operation lever has been operated to the vicinity of the detent position.

According to the control valve of the third aspect of the present invention, the operating force acting position at which the operating force applying member acts on the operating force applying surface, and the detent at which the detent force applying member acts on the detent force applying surface. The force acting position is disposed substantially symmetrically about the center of the width direction of the rotation center axis in the width direction of the cam member, and the operating force applying surface and the detent force applying surface are provided with the operating force imparting surface. Since it is provided substantially perpendicularly to the action axis connecting the position and the detent force applying action position, the detent force applied from the detent force applying member to the cam member and the detent force applied from the operating force applying member to the cam member are applied. The operating force acts in a direction that cancels each other out in the direction of the acting axis, and these forces acting on the cam member do not act as couples.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a control valve according to the present invention.

FIG. 2 is a partial cross-sectional view showing a state when an operation lever is rotated to a position near a detent position in the control valve of FIG. 1;

FIG. 3 is a partial cross-sectional view showing a state when an operation lever is rotated to a detent position in the control valve of FIG. 1;

FIG. 4 is a diagram showing a relationship between an operation angle of an operation lever and an operation torque in the control valve of FIG. 1;

FIG. 5 is a simplified cross-sectional view showing a positional relationship between a detent force applying mechanism and an operating force applying mechanism in a modified form of a control valve.

FIG. 6 is a sectional view showing an example of a conventional control valve.

[Explanation of symbols]

 2,102 Valve housing body 4,104 Upper housing 6,106,108 Spring chamber 8,110,112 Spool hole 10,114,116 Spool 12,154,156 Push rod 20,190 Cam member 23,200 Operation lever 24, 208 Detent force application mechanism 28, 212 Detent force application member 34, 210 Detent force application surface 38, 216 Detent recess 230 Operation force application mechanism 232 Operation force application surface 234 Operation force application member 236 Operation force sudden change projection

Claims (3)

(57) [Claims] 1. A valve housing body having a spring chamber and a spool hole communicating with the spring chamber, a spool movably mounted in the spool hole, a cam member for operating the spool, and rotating the cam member. An operating lever for moving the spool, a spring member biasing the spool toward the cam member, a detent force applying mechanism for applying a detent force to the operating lever, and the operating lever A control force sudden change mechanism for rapidly changing the operation force of the control member, wherein the detent force application mechanism is provided in a part of the cam member and has a detent recess provided corresponding to a detent position. A detent force imparting action surface, and a detent force imparting member for acting on the detent force imparting action surface to impart a detent force. The operation force sudden change mechanism is provided on another part of the cam member, and has an operation force application surface having an operation force sudden change projection for rapidly increasing the operation force, and an operation force application surface. An operating force applying member for applying an operating force by acting, when the operating member is operated to rotate the cam member,
A control valve, wherein the operating force applying member rides on an operating force suddenly changing projection on the operating force applying action surface. 2. When the operating lever is at the detent position, the detent force applying member engages with the detent recess, and immediately before the detent force applying member engages with the detent recess, the operating force applying member is engaged. 2. The control valve according to claim 1, wherein the control valve rides on an operation force suddenly changing projection on the operation force application action surface. 3. The operating force imparting surface is disposed on one side of the cam member, and the detent force imparting surface is disposed on the other side, and the operating force imparting member is disposed on the operating force imparting surface. The operating force acting position acting and the detent force acting position at which the detent force applying member acts on the detent force applying surface substantially correspond to the width direction center of the rotation center axis in the width direction of the cam member. The operation force imparting action surface and the detent force imparting action surface are disposed symmetrically with respect to an upper point, and the operating force imparting effect surface and the detent force imparting action surface are provided substantially perpendicular to an action axis connecting the operating force imparting position and the detent force imparting position. The control valve according to claim 1, wherein the control valve is provided.