KR20170045732A - Distributor of hydraulic fluid under a controlled pressure - Google Patents

Abstract

The present invention provides a distributor of hydraulic fluid under a control pressure, capable of attenuating oscillation or vibration of a control lever or pedal. According to the present invention, a hydraulic operator comprises: an inner diameter (121) to receive a plunger (16) to which action and return power (171) of a control mechanism (110) are applied; a slide (180) to receive thrust of the plunger (160) with respect to a force of a correction spring (188); and a pressure controller (150) to space the inner diameter (121) of the plunger and the inner diameter (126) of the slide (180), to receive the correction spring (188), and having an axial cavity (123) to communicate with an outlet facing a storage (101). The inner diameter (121) restricts a damping chamber (190) filled with hydraulic liquid and the volume of the damping chamber is decreased in accordance with return motion of the plunger.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic fluid dispenser (DIN)

The present invention relates in particular to a hydraulic manipulator having a pressure regulator for receiving and supplying hydraulic fluid to a downstream device at a pressure set by operation of a control engine, A slide receiving the plunger's thrust against the force of a calibration spring defining an outlet pressure by controlling the communication between the inner pressure of the plunger receiving the plunger and the communication between the high pressure liquid inlet and the regulating pressure liquid outlet and an axial cavity that separates the inner diameter of the plunger from the inner diameter of the slide and receives the compensating spring and communicates with the reservoir counter-directional outlet.

European Patent EP 1 556 618, as well as such compressed hydraulic fluid dispensers according to French Patent FR 2 009 201, FR 2 376 978, FR 2 507 732 and FR 2 781 846 are already well known.

Particularly, such a hydraulic fluid distributor, which is used as a hydraulic actuator for controlling by a lever using a hand or a pedal for controlling by a foot, has a disadvantage in that it causes vibration of the control engine when the distributor returns from the operating position to the neutral position in some operating states.

Such oscillations of the device may not only cause inconvenience to the operator but may also cause the device to fatigue or, in the case of a distributor equipped with an electromagnetic locking coil, one or several pressure regulators involuntarily .

These vibrations are more discomfortable as they can be sustained or amplified due to extrinsic reasons such as dynamic motion of a machine equipped with an actuator controlled or refueled by such a distributor.

The present invention aims to develop a distributor that damps oscillations or vibrations of a plunger, i.e., a steering lever or a steering pedal, so that vibration does not occur around a neutral position when the distributor is out of an operating position.

To this end, the present invention is characterized in that the plunger defines a volumetrically variable attenuating chamber filled with a hydraulic fluid whose inner diameter, wherein the volume of the attenuating chamber decreases with return movement from the regulating position of the plunger, Wherein the hydraulic fluid distributor communicates with a hydraulic fluid recovery port through a liquid outlet throat to prevent return movement of the regulator.

The distributor according to the present invention has an advantage in that the motion between the plunger and the distributor body is attenuated when the pressure reducer returns to the neutral position. Thus, the operation of the distributor is made more regular and the operator is also comfortable. In addition, by not causing vibrations, the noise is reduced and the inside of the distributor and the surrounding substrate are not tired. In addition, through the operation of vibration-free operation, the operator who has been busy with hand-operated operation and switching to the neutral position numerous times, is no longer unnecessarily abused. In addition, the pressure regulator damping device in the distributor has a safety advantage by preventing the involuntary start of one or several pressure regulators integrated in the same distributor.

According to another advantageous feature, the distributor not only receives at least one pressure regulator controlled by the operating engine but also forms a shoulder with the cavity of the plunge inner diameter along the axis, A slide inner diameter passing through a channel communicating with the regulating pressure liquid outlet is starting from a source of high pressure and the slide inner diameter is a high pressure liquid inflow conduit and an outlet port for regulating the supply liquid pressure and a storage orientation low pressure The slide which receives the slide to control communication between the outlets and which has been pushed to the neutral position by the correcting spring has a body mounted with a controlling rod penetrating the cavity so as to be in contact with the plunger.

In the case of a dispenser according to the invention with an attenuator, this is a particularly simple embodiment in which the hydraulic fluid of the dispenser is used with the damping means incorporated in the plunger. Since this embodiment is integrated into the shape of the plunger, the method of manufacturing the distributor is not complicated.

According to another advantageous feature, the plunger is comprised of an upper portion with a diameter equal to the inner diameter and a lower diameter than the inner diameter, the upper portion being housed in a plug located within the inner diameter inlet, the attenuating chamber having an inner diameter, . In this embodiment of the plunger with the upper and lower portions and the embodiment obtained from the attenuating chamber, the distributor can be manufactured and mounted particularly simply because the plug defines the attenuating chamber when the regulator with the plunger is installed in different inner diameters .

According to another advantageous feature, the plunger comprises a blind hole leading to the base and reaching into the top, and at least one lateral orifice leading to the free surface and having a throat.

Because of this embodiment, the communication between the attenuating chamber and the reservoir facing hydraulic fluid outlet is made particularly simple.

According to another advantageous feature, the upper part of the plunger comprises a filling hole which leads into the axial hole in its surface, not covered by the plug, in the adjustment position of the slide, to ensure filling of the damping chamber. As a result, it is possible to simultaneously prevent cavitation and the operation of the damping chamber, and also the inflow of bubbles into the interior of the damping chamber, which deteriorates the efficiency.

The uncovered surface of the top of the plunger is exposed when the plunger is pressed into the operating position. The filling hole ensures movement between the attenuating chamber and the charge attenuating chamber ensuring communication between the reservoir and the cavity itself and the cavity itself connected to the hydraulic fluid reservoir to allow movement of the control organ when it is redirected to the neutral position Damping.

According to another advantageous feature, in the case of a dispenser equipped with an electromagnetic coil for blocking the position of the control organ through electromagnet interception of the plunger, the plunger is of the same diameter as the inner diameter, and the lower part is accommodated in the inner diameter and the upper part is smaller in diameter than the inner diameter The plunger being contained in an electromagnetic coil support for blocking the position of the regulator and forming an inner diameter for the upper and lower bores, while the attenuation chamber is defined by the lower inner diameter of the support and the plunger portions.

In this embodiment, the electromagnet support for pulling and blocking constitutes a part of the distributor main body which accommodates the upper and lower portions of the plungers of different diameters from the viewpoint of function and forms the inner diameter for performing the damping seal volume.

According to another advantageous feature, in the case of such a dispenser with electromagnetic shielding function, the plunger moves into the lower part of the lower inner wall and into the shoulder between two parts of different diameter, which is attenuated when the plunger is at a lower And at least one notch that ensures communal communication with the thread,

Finally, according to another advantageous feature, the orifice of the plunger extends into the groove in the upper part of the plunger. These grooves have the advantage of ensuring a damping function that maximally regulates the liquid to reach the orifices or orifices by distributing the liquid more easily within the throat orifices or orifices and eliminates vibration of the plunger.

In conclusion, an adjustable or controlled compression hydraulic fluid dispenser is particularly simple to manufacture, so that there is no need to reconsider conventional conventional manufacture or installation for such distributors, as well as simplifying the usage for operators or operators It has the advantage of making it more efficient and easier to handle for operators who control the device.

The present invention will be described in more detail through several distributor embodiments shown in the attached drawings.
1 is an axial cross-sectional view of a first embodiment of a dispenser, showing a distributor body with a pressure regulator on one side in a working position and a plunger and pressure regulator on the other side.
Fig. 2 is a sectional view similar to Fig. 1 for a second embodiment of a distributor having an electromagnetic position isolation function.
3 is a front view of the distributor plunger according to the second embodiment.
4A and 4B are partial cross-sectional views showing the inside of the plunger according to the two indentations of the plunger shown in Fig.
5 is an axial cross-sectional view of a first embodiment of a dispenser with two paired pressure regulators, as seen in Figures 5a and 5b, wherein 5a shows the operating position of the pressure regulator and 5b shows the neutral position Lt; / RTI >
6 is an axial cross-sectional view of a second embodiment of a dispenser with two paired pressure regulators as shown at 6a, 6b, in which 6a shows the operating position of the pressure regulator, 6b shows the neutral position of the pressure regulator Show.

Conventionally, the directions used in the specification for locating the elements are as shown in the figure. In accordance with this orientation display convention, terms such as high, low, up, down, up, down and other terms have only meaning for the direction indication of the drawing to make the specification easy to understand and simple.

Figure 1 shows a hydraulic fluid dispenser 102 such as an actuator operated by a control engine 110 in the form of a lever 111 mounted on a distributor body 120 via an articulation 112 and in particular a Cardan joint. Sectional view showing two portions of the distributor according to the first embodiment of the present invention. The control engine 110 includes a spider 113 with a finger for operation of the distributor so as to provide regulating pressure relative to the regulated value imposed by the control engine 110 at the outlet.

The figure is limited to a cross-sectional view of a single regulator that operates when pressure is applied by the control engine 110 in the direction of the XX axis of the device, while the opposite regulator is shown without a plunger and slide to show the structure of the distributor body 120 will be.

In general, the operation of the control engine 110 may be controlled by the XX axis plunger, by the pivoting of the spider 113 finger, or by translation, for example by a pedal, .

The adjuster 150 as shown forms a shoulder 122 with an inner diameter 121 in alignment with the XX axis and defines a shoulder 122 that receives the slide 180 and has a different inner diameter 126 with a cavity 123 consisting of a short section of plunger 160 housed in successive inner diameter 121. The end of the cavity 123 side slide 180 is mounted with an axial rod 183,185 at the end of which the head 187 is brought into the housing 165 of the plunger base 164. On the other hand, at the opposite end of the slide 180, there is an axial hole 182 which extends into the slide inner diameter 126 and the outlet 128.

The slide inner diameter 126 is connected to an axial hole 182 of the slide 180 which is connected to a Source of High Pressure (SHP) and which leads to a downstream device for receiving hydraulic fluid of the pressure regulated by the pressure regulator 150 And the pipe 127 extending through the pipe 127 passes through. The regulating pressure liquid outlet 128 has a connection 129 for connection of the downstream device U, not shown.

1, the distributor body 120 includes the following on the XX axis of the regulator 150 starting at the side of the control engine 110: < RTI ID = 0.0 >

An inner diameter 121 which receives the plunger 160 and communicates with the next cavity 123,

A small section of cavity 123 forming the shoulder 122 along with the inner diameter 121 and connected to the reservoir 101 through the hole 124,

The slide 180 is separated from the high pressure source SHP by the high pressure liquid line 127 with a small section slide inner diameter 126 relative to the cavity section 123 forming the shoulder 125 and receiving the slide have.

- a slide inner diameter (126) followed by a connecting portion (128) of the outlet or a hydraulic fluid using device (U) controlled by the control engine (110).

The plunger 160 has an upper portion 161 of a small section that joins the lower portion 163 in the inner diameter section through the shoulder 162. The upper portion 161 is guided into the inside diameter 135 of the plug 130 which closes the top of the inside diameter 121. And the upper portion 161 of the plunger receives and holds the coupling finger end of the control engine 110 spider 113 past the plug 130.

The inner diameter 121 likewise receives a cup 170 between the plunger base 164 and the shoulder 122 which is received in the cavity 123 and which engages the shoulder 122 of the slide inner diameter 126 125 by the return spring 172 which is opposite to the end.

The cup 170 is independent of the translational movement of the plunger base 164 in the (XX) axis, but is hollow when the cup 170 is over the base portion 164, (171) enters the protruded central portion of the base portion and forms a lateral coupling with the base portion (164).

The slide 180 has a hollow portion with an axial hole 182 extending from the regulating pressure liquid outlet port and a second rod segment 185 after forming a first shoulder 184 with a first rod segment 183 And a rod 183,185 with a head 187 attached to the tip of the slide 160 to enter the housing 165 extending from the base 164 of the slide 160 while forming the second shoulder 186. [

The rods 183,185 are positioned between the head 187 and the second shoulder 186 to allow free passage of the cup 170 secured on the second rod segment 185 by a retaining washer 173 .

The rods 183,185 are surrounded by a compensating spring 188 that spans the washer 189 whose upper end extends over the cup (or its washer) and whose lower end is fixed by a first shoulder 184 forming a pedestal. The shape of the slide 180 and its transverse holes 181 and the stroke of the slide show that the transverse holes 181 extend into the interior of the cavity 123 at the neutral position, And communicates with the cavity 123 which receives the pressure of the liquid.

At the operating position (i.e., a different position from the neutral position), the slide 180 is depressed somewhat so that the lateral hole 181 gradually passes into the channel 127, so that the liquid at the set pressure is connected to the downstream device It is possible to control the shift to the outlet 128 side. Such an operating position is shown in Fig. Detailed outlet pressure control methods are well known and described in the technical context documents.

According to the present invention, the plunger 160 forms the damping chamber 190 defined by the plug 130 in the inner diameter 121 and defined by the high-level portion. The inner diameter 121 and the plunger upper portion 161 are sufficiently different from each other in diameter so that an outer ring joint and a plunger upper portion 161 in contact with the inner diameter 121 of the plug 130 in the form of a sleeve, It is possible to integrate the inner joints 132 which are in contact with each other.

The plug 130 itself is clogged by a plate 134 covering the upper portion of the distributor body 120. The plunger 160 is located at its upper portion 161 and is particularly radially oriented and extends from the free surface of the plunger to the base portion 164 within the housing 165 of the plunger housing the head 187 of the slide 180 rod. And has one or several transverse orifices 191 leading into axial holes 193 that open into the interior. This hole 193 communicates with the cavity 123 around the cup across the cup 170 at the center through the shape engagement with the projected base portion 164 of the plunger so that there is no friction with the inner wall of the inner diameter 121 .

The holes or holes 191 have a throat for preventing the liquid in the damping chamber 190 from being returned to the reservoir 101. There is also an orifice 192 without throat. So that the orifices form a depressurizing and / or damping chamber charging orifice.

Holes or holes 191 and 192 are formed in the plunger 130 defining the damping chamber 190 at various heights between the maximum press-fit position and the maximum raised position of the plunger according to FIG. 1 when the axial height of the damping chamber 190 is at its minimum And is dispersed in the upper portion 161 of the plunger 160 so as to communicate with the damping chamber 190 in the portion.

The upper surface of the upper portion 161 is exposed under the plug 130 such that when the plunger 160 is press-fitted, the slide 180 is placed in the liquid outlet pressure regulating position. The adjustment position of the slide 180 is a position at which the transverse hole 181 can communicate with the conduit 127 through which the high-pressure liquid passes.

The maximum indentation position is the position where the upper portion 161 is as far as possible from the plug.

Conversely, when the plunger 160 floats to the maximum, the shoulder 162 is brought into contact with the plug 130 at all.

Considering at least one orifice 191 with a throat 192 at the height of the shoulder 162 in advance, in order to discharge the liquid from the damping chamber 190 and prevent blocking of the liquid due to congestion in the base of the damping chamber good.

Throat orifices or orifices 191 do not extend in a single direction so that even though the damping chamber 190 allows for the recovery of liquid even when the plunger is in the negative pressure state, (Or plunger) is in the regulating position and there is a re-levitation motion of the plunger 160, a throat-free orifice (not shown) is provided to facilitate charging of the attenuating chamber 190 and, (192) is considered in advance at the top of the upper portion (161). The throttle orifices or orifices 191 will then act as a motion damping function while preventing liquid escape, as the orifices 192 are quickly blocked within the inner diameter 135 of the plug 130.

Therefore, when the regulator is controlled to return to the neutral position when the plunger 160 is rebuilt, the damping chamber 190, which is filled with the hydraulic fluid, is prevented from flowing out by the throttling of the orifices or orifices 191 Gradually recovered. The motion of the plunger 160 is then damped and no vibration occurs when the plunger reaches the neutral position.

Fig. 2 is a cross-sectional view of the type shown in Fig. 1, but a variant 200 of a hydraulic fluid dispenser with electromagnetic cut-off function.

Since the parts of the second embodiment are the same as or similar to the parts of one embodiment, the reference documents extended for the distributor 100 are also identical to each other. However, it is not necessary for these reference documents to describe all similar or identical parts again.

The dispenser body 220 is configured such that the supporter 240 of the electromagnetic coil is mounted on the plunger and the space 236 for the plate 266 to be fixed to the electromagnet is located at the top, And a housing 221a for accommodating the electromagnetic coil forming the device is provided in the high-level portion.

In the upper layer, there is an upper inner diameter 241 with a groove for receiving the joint in the support 240, and a lower inner diameter 242 with a larger diameter below the inner diameter. The main body 220 has an inner diameter 221 below the housing 221a on the XX axis and a collar 243 is provided at the lower end of the support 240 in the inner diameter.

The inner diameter 221 is supported by a helical spring 246 and is connected to a sliding sleeve 258 constituting an elastic stopper that sends a signal to the control engine 210 when the press- sleeve (245).

Below the inner diameter 221 is a cavity 223 connected to the reservoir 201 through a hole 224 and below the cavity is a slide inner diameter 226. In the case of slide 280 has rods 283 and 285 mounted on the shaft with head 287 in housing 265 of the plunger 260 base. The rod passes through a cup 270 that spans the base of the plunger 260, as in the previous embodiment. The cup 270 also serves as a high-rise pedestal support for the correction spring 288, the bottom of which spans over the shoulder 284 of the rod by a washer 289.

In this dispenser 200 embodiment, the plunger 260 includes a lower portion 263 that is guided in the lower inner diameter 242 of the support 240 and a lower portion 263 that is guided within the upper inner diameter 241 of the support 240, And a lower portion 261 having a smaller diameter.

Here, the support 240 of the electromagnet, which is identical to the distributor body, forms a damping chamber 290 which receives the hydraulic fluid from the cavity 223 together with the plunger 260.

As described above, the plunger 260 includes one or several orifices 291, which are particularly radially oriented and have a throat. The orifice 291 leads into an axial hole 293 which is open in the direction of the cavity 223 connected to the reservoir 201. [

Meanwhile, the attenuation chamber 290 is operated as in the above-described embodiment. When the plunger 260 starts from the operating position and is reinserted to the neutral position, the hydraulic fluid arriving at the damping chamber 290 is gradually withdrawn through the throat orifices 291 towards the reservoir 201. This transition of the hydraulic fluid lowers the return speed of the plunger 260 and attenuates motion at the neutral position and prevents vibration from occurring around the neutral position.

3 is a front view of the plunger 260 according to the second embodiment. The plunger 260 includes a peripheral groove 294 at the height of the throat orifice 291. Below the throats, at the end of the maximum indentation of the plunger 260, there is one or several notches 295 in the operative position so that the damping chamber 290 and the cavity 223 filled with the hydraulic fluid So that the damping chamber 290 is filled with the hydraulic fluid so that the movement of the plunger can be damped by restricting the plunger 260 as described above when the plunger 260 is re-lifted.

4A and 4B illustrate two locations of the plunge 260 within the illustrated inner diameters 241 and 242 as implemented on the support 240 and may be the distributor body and plug according to the embodiment of FIG. 4A shows the maximum indentation position. In this position, two side notches 295 under the stopper surface formed by the shoulder 262 between the plunger bottom 263 and the top 261 communicate the cavity 223 and the damping chamber 290, It is guaranteed to be filled with hydraulic fluid. FIG. 4B shows a high level of the plunger 260. FIG. In this position, the last damping orifice 291 continues to communicate with the damping chamber 290 through its outer circumferential groove 294, thereby reducing the height of the damping chamber 290 as much as possible.

3, a side notch 295 is formed along the notch 295 and the section of the cylindrical surface of the lower portion 263 of the plunger 260, following the right angled section, And thus geometrically corresponds to the intersection of the semicircular passes of the circular section, it gives the impression that the plunger 260 does not contact the inner diameter on the contours shown on both sides of Fig. If so, the plunger is in contact with the surviving segments between the two or four notches 295.

Figure 5 shows two distinctive positions of the distributor 100 in sections 5a and 5b.

5A, the control engine 110 controls the left pressure regulator 150G at the extreme position corresponding to the case where the lateral orifice of the slide, which regulates the pressure of the hydraulic fluid supplied to the outlet at the maximum regulated pressure state, Lt; / RTI >

FIG. 5B shows the neutral position of the distributor 100. FIG. In this position, two slides 180 of the adjusters 150G and 150D can be heard. So that they are no longer able to accommodate the compressed hydraulic fluid as they block the supply line 127 which sends the hydraulic fluid towards the outlet of the downstream device U. [ The orifices passing through the two slides 180 are then positioned at least partially over the shoulders 125 between the cavity 123 and the slide inner diameter 126 so that the assembly can be moved relative to the reservoir 101, Make it possible to communicate with pressure.

Figure 6 shows two specific locations of the electromagnetic interrupter distributor 200 in sections 6a and 6b. In Fig. 6A, the left regulator 250G is at the operating position (the figure is not correct).

Figure 6b shows two regulators 250G and 250D in neutral position, where the downstream device is shut off while the downstream device U opposing outlets are in communication with the reservoir 201 in the neutral state.

In the case of the regulator pairs 150G and 150D or 250G and 250D, while supplying the hydraulic fluid of the pressure regulated by one of the same pair of regulators to the damping chamber of the operating phase, through another regulator open towards the reservoir collection port Each cylinder can be controlled to have a dual effect of allowing drainage in different attenuation chambers of the cylinder.

100, 200: Hydraulic liquid distributor
101, 201: storage
110, 210:
111: Lever
112: articulation
113: Spider
120, 220: distributor body
221a: Housing
121, 221: inner diameter (bore)
122, 222: Shoulder
123, 223: Cavity
124, 224: storage opposing hole
125, 225: Shoulder
126, 226: slide inner diameter 127, 227: channel,
128, 228: outlet
129, 229:
130: plug
131: Outer joint
132: Inner joint
134, 234: plate,
135: Inner diameter
236: Plate position
240: coil support
241: upper inner diameter
242: lower inner diameter
243: collar
245: Sliding sleeve
246: spring
150, 250: regulator
160, 260: plunger
161, 261:
162, 262: Shoulder
163, 263:
164, 264:
165, 265: Axial housing
266: Plate
170, 270: cup,
171, 271: hollow (hollow)
172, 272: return spring,
173, 273: a retaining washer
180, 280: Slide
181, 281: transverse hole
182, 282: Axial hole
183, 283: a first segment of rod,
184, 284: first shoulder
185, 285: second load segment
186, 286: second shoulder
187, 287: head,
188, 288: a calibrating spring,
189, 289: washer
190, 290: attenuation chamber
191, 291: an orifice with a throat,
192, 292: Orifice
193, 293: Axial hole
294: peripheral groove
295: Notch

Claims (8)

A hydraulic actuator having a pressure regulator (150) for receiving a high pressure hydraulic fluid and supplying it under the control of the downstream apparatus (U) to a pressure set by the operation of the control engine (110)
- an inner diameter which accommodates a plunger which receives the action and return force of the control organ,
A slide which receives the thrust of the plunger against the force of the compensating spring which limits the outlet pressure by controlling the communication between the high pressure liquid inlet, the regulating pressure liquid outlet and the storage opposite outlet,
- an axial cavity which separates the inner diameter of the plunger from the inner diameter of the slide and which accommodates the compensating spring and communicates with the reservoir counter-
The volume of the damping chambers 190 and 290 decreases as the plunger 160 and 260 return from the regulating position of the plunger 160 and 260, ,
Characterized in that the damping chambers (190, 290) communicate with the hydraulic fluid return to the reservoir (101) through at least one liquid outlet throat (191) to prevent the return motion of the regulator. 3. The apparatus according to claim 1, wherein the body (120,220) not only accommodates at least one pressure regulator (150,250) controlled by the operating engine (110,210)
The plunger inner diameter 121,242 along which the cavities 123,223 are formed forms the shoulders 122,222 and the cavity itself is provided with channels 127,227 starting from a high pressure source SHP and communicating with the regulated pressure liquid outlets 128,228 The slide inner diameters 126 and 226 are continuous,
The slide inner diameter 126,226 controls the communication between the high pressure liquid inflow conduit 127,227, the outlet for the downstream device feed liquid pressure regulation and the low pressure cavity 123,223 communicating with the reservoir 101,201 through the conduit 124,224 Receiving slides 180, 280,
Characterized in that the slides (180,280) pushed to the neutral position by the compensation springs (188,288) are fitted with control rods (183,185) passing through the cavities (123,223) so as to be in contact with the plungers (160,260) Distributor The plunger according to claim 1, wherein the plunger is composed of a lower portion having the same diameter as the inner diameter and an upper portion having a diameter smaller than the inner diameter, Characterized in that the damping chamber (190) is defined by an inner diameter (121), an upper plunger (161), and a plug (130) The apparatus of claim 1, wherein the plunger (160, 260) extends into the base (164, 264) and has blind holes (193, 293) reaching into the top, and at least one lateral orifice 191, < / RTI > 291) 5. A device according to any one of the preceding claims, wherein the upper portion (161) of the plunger (160) is provided on its surface not covered by the plug (130) at the adjustment position of the slide (180) 193), and a filling hole (192) for ensuring filling of the damping chamber (190), leading to the inside of the hydraulic fluid distributor The plunger according to claim 1, wherein the plunger (260) comprises an inner diameter (242) for receiving the lower portion (263) and an upper portion (261) having a smaller diameter than the inner diameter (242)
The plunger 260 is accommodated in the electromagnetic coil support 240 for blocking the position of the regulator 250 and forms an inner diameter 242 for the upper portion 262 and an inner diameter 242 for the lower portion 263, Characterized in that the seal (290) is defined by the lower inner diameter (242) and the portions (261, 263) of the plunger (260) The method of claim 6, wherein when the plunger (260) is in its lower portion (263), open to the inner wall of the lower portion (263) and into the shoulder (262) Characterized in that it comprises at least one notch (295) ensuring communication between the damping chamber (290) and the cavity (223) The hydraulic fluid dispenser of claim 1, characterized in that an orifice (291) of the plunger (260) leads into a groove (294) of the plunger (260)

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