KR100516767B1 - Motor vehicle clutch pedal vibration absorber - Google Patents

Abstract

The present invention relates to a vibration absorber (7) with a housing, which is equipped with an elastic material block (22) defining the cavity (9) and sealingly closing the cavity. The present invention can be applied to automobiles.

Description

Clutch pedal vibration absorber {MOTOR VEHICLE CLUTCH PEDAL VIBRATION ABSORBER}

The present invention relates to hydraulic control of an automobile clutch, and more particularly to a hydraulic vibration absorber included therein.

A control system of the above kind is disclosed in French Patent Publication No. FR-A-2 442 156.

In the above-mentioned French Patent Publication FR-A-2 442 156, the control device 1 (FIG. 1) includes a clutch pedal 2, a sender 3 forming a master cylinder, and a hydraulic receiver. (5) is included.

In this known method, the pressure transmitter 3 comprises a fixed cylinder in which the piston connected to the clutch pedal 2 by the rod 31 moves axially.

The upper part of the pedal is here hinged to the fixed part 20 of the motor vehicle.

The hydraulic pipe 4 connects the master cylinder 3 to a hydraulic press 5 which forms a cylinder for operating the clutch 39 of the automobile, the clutch being a diaphragm 37, a cover 33, a pressure plate 38. ), Disc 41 and recoil plate 30. Control fluid is passed through the pipe. The hydraulic press 5 is inclined to the oil press, and includes a fixed cylinder, wherein a piston connected to the clutch release fork 6 by the rod 51 is moved axially in the fixed cylinder, and the fork is pressurized. The pressure plate of the clutch 39 is operated in a known manner on the clutch release thrust bearing 36 of the clutch 39 in contact with the diaphragm 37 which is bearing-coupled with the cover 33 to operate on the plate 38. The friction lining of the friction disc between 38 and the recoil plate 30 is fixed and forms a drive flywheel.

The cover is fixed to a recoil plate that is forced to rotate with the crankshaft of the engine of the vehicle, and the friction disc is forced to rotate with the input shaft of the gearbox.

Accordingly, the hydraulic press 5 operates directly or indirectly on the clutch release bearing of the clutch 39 to operate the clutch driven by the engine of the motor vehicle.

A more detailed description is disclosed in French Patent Publication No. FR-A-2 730 532.

In said French patent publication FR-A-2 730 532, the hydraulic press can comprise a piston acting directly on the clutch release thrust bearing, the hydraulic press is concentric and the input shaft of the gearbox passes through the hydraulic press.

In all cases, the piston and the cylinder form a variable volume chamber.

When the clutch is released, the pressure reducer is pressed by the pedal 2 compressed by the driver, the volume of the control chamber of the pressure reducer 3 is reduced, and the volume of the control chamber of the hydraulic press 5 is increased. The opposite phenomenon occurs when the clutch is engaged, the volume of the control chamber of the hydraulic press is reduced and the volume of the control chamber of the pressurizer is increased, and then the chamber is depressurized.

Thus, the control fluid is transferred from one chamber to the other chamber.

The driver presses the clutch pedal to release the clutch, and vibrations from the engine are transmitted to the pedal via the clutch thrust bearing 36, the hydraulic press 5, the pipe 4 and the oil press 3.

These vibrations make the driver uncomfortable and change depending on the rotational speed of the engine. Especially diesel-powered cars are serious. The influence of this vibration is amplified by the geometric instability of the diaphragm 37. Since the diaphragm is truncated conical and heat treated in the relaxed state, the diaphragm is not in the same plane.

For this reason, a hydraulic vibration absorber 10 is provided in the pipe 4. The hydraulic vibration absorber 10 is fixed to a fixed part of the vehicle, and absorbs the fluctuations caused by the vibrations in the hydraulic pressure transmitted from the hydraulic press 5 and the vibration of the engine of the automobile so that the fluctuations are transmitted to and from the transformer 3. This prevents the pedal 2 from proceeding.

To this end, the pipe 4 comprises two parts 4a and 4b respectively connected to the transformer 3 and the vibration absorber 10 and to the hydraulic press 5 and the vibration absorber 10, respectively.

The vibration absorber 10 has a hollow body with each orifice connected to parts 4a, 4b, for example in the form of a pipe. In addition, the absorber 10 includes a cavity between the two orifices, and the piston compresses and expands a block of elastic material disposed outside so as to reciprocate in the cavity so as not to come into contact with the control fluid.

To this end, the shoulder piston carries a seal, and the block of elastic material is supported on the outside of the body of the hydraulic absorber.

Therefore, the above solution requires a large number of parts. It is also bulky in the height direction (vertical).

Summary of the Invention

It is an object of the present invention to provide a simple and economical method of overcoming the above mentioned disadvantages.

According to the invention, in the vibration absorber of the above-described type, an elastic material block is mounted to the housing of the body of the vibration absorber, and the cavity forming the fluid chamber seals the cavity sealingly and contacts contacted to the body of the vibration absorber. It is characterized by being defined by an elastic material block that is supported on floating.

The present invention reduces the number of parts because the elastic material block has a sealing function and a vibration absorbing function.

In addition, the overall height direction size is reduced, and the piston does not become large in the radial direction. Vibration absorbers are thin and economical.

According to an embodiment of the invention, the housing is shouldered to bearing-engage with the first through disk disposed between the cavity and the block of elastic material. Because of the first disk, the block is subjected to the action of a control fluid and thus can absorb vibrations directly. The damper is controlled by a hole in the first disk that is related to the strength of the block of elastic material. The shoulder housing is in communication with the cavity.

Thus, the first disk can be supported on the shoulder, and the block of elastic material is in intimate contact with at least a portion of the outer periphery of the housing, ie a portion of the transverse face of the housing, to provide a seal.

Thus, the assembly is simple and effective by screwing the parts together.

The contact advantageously comprises a second disk having a hole therein. The elastomeric block has at least one recess in contact with a hole in the second disk to ensure air circulation and control the deformation of the block. The block may be hat shaped and deform in the transverse direction (horizontally).

The second disk is held in place by a U-shaped pin, for which purpose the branch of the pin is coupled to a passage provided in the body of the absorber.

Other variations may use other means such as male thread washers that engage with threads in the inner bore of the housing.

In another embodiment, the second disk is glued, welded, crimped or clipped to the body of the absorber or fixed by a retainer.

The block between the first disk and the contact is subjected to compressive stress. In all cases, the hydraulic absorber forms an assembly that can be adjusted and transported and tested prior to installation.

The damper can be attached to a hydraulic press or a transformer, in which case the pipe is one part.

The damper need not be fixed to a fixed part of the vehicle. The first disk may not be needed.

Moreover, the advantages of the present invention will be well understood from the following description with reference to the accompanying drawings.

1 is a schematic diagram of a hydraulic control system of the prior art,

2 to 4 are axial sectional views of various embodiments of the hydraulic absorber according to the present invention;

5 is a sectional view of a supply branch,

6-9 are axial sectional views of another embodiment.

 In the figure the absorber of Figure 1 is replaced by the clutch pedal absorber of the present invention. For simplicity, the absorber is denoted by the same reference numeral 10.

The absorber 10 has a hollow body 7 made of a material that can be molded or cast, for example a plastic material or an aluminum based material.

2 to 4, arrows V and H represent vertical and horizontal directions, respectively.

2 to 4, the body 7 has a vertically oriented housing 8. This housing is opened into the cavity 9 which is coupled to the orifices 12, 13, and the control fluid flows through the orifices.

The shoulder 11 defines a housing 8 of the cavity 9.

The main body 7 is staggered in the vertical direction, and the cavity 9 is smaller in the horizontal direction so as to extend vertically in the housing 8 and define the shoulder 11.

The body 7 has first and second orifices 12, 13, which are each suitable for connection to the portions 4a, 4b of the pipe of FIG. 1.

The orifices 12, 13 form a fluid chamber on each opposite side of the cavity 9 and are formed or cast in an internal connection passage. In FIG. 2, the orifice 12 is part of the female connector 14 and the orifice 13 is part of the male connector 15. Orifices 12, 13 are oriented horizontally.

The cavity 9 has a central projection 16 with a symmetrical transverse side profiled to form a chicane of the flow of control fluid between the orifices 13, 12. The transverse side here is of circular arc shape. The overall shape of the main body 7 is T-shaped.

In FIG. 3, the orifices 12, 13 are part of the female connectors 17, 18. The control fluid flows through the body 7 in a U-shaped path.

In more detail, the connectors 17, 18 are oriented vertically, perpendicular to the combination of the housing 8 and the cavity 9. The cavity 9 has a central protrusion 160 to form a seeken.

The transverse side surface of the protrusion 160 is inclined.

In FIG. 4, the orifices 12, 13 are each part of the female connector 14, with no seeker in the cavity 9.

As shown in FIG. 2, the body 7 is T-shaped and the connector 14 is oriented horizontally as the control fluid flows.

In another embodiment, the body 7 may be provided with two male connectors. All combinations are possible.

The portions 4a and 4b have a connector which is inherently complementary to the connector in the orifices 12 and 13.

For example, the portion 4a has a male connector at its end and is coupled inside the connector 14 of FIG.

Each female connector 14, 17, 18 is coupled with two passages 46 (FIG. 2). The male connector 15 has a groove 21 on the outside.

This configuration is possible due to the fact that the feed branch operating between the vibration absorber 10 and the portions 4a, 4b of the pipe 4 is in the form of a plug as disclosed in French Patent Publication No. FR-A-2 736 136. Do.

For example, as shown in FIG. 5, the male connector 26 with the block 22 of the portion 4a is axially inwardly of the female connector 14 by the U-shaped transverse pins 48. Retaining the engagement, the two parallel branches 49 of the U-shaped transverse pins 48 are each engaged in one transverse housing 46 of the connector 14. The two branches 49 work with the outer annular groove on the connector 26.

In FIG. 5, the transverse pin 48 is in an intermediate position, and the enlarged end portion 56 operates with the radial flange 60 of the connector 26. The enlarged end portion 56 may not be necessary.

In the fully pushed locking position, the recess of the bent middle portion 156 of the pin is clamped onto the connector 26 and more precisely on the bottom of the groove on the connector 26.

The connector 14 of course comprises a purging orifice, which may be provided with two grooves as disclosed in the above-mentioned French Patent Publication FR-A-2 736 136.

In a variant embodiment, the feed branch may be in the form of a screw or other form with a retainer.

According to one feature of the invention, the elastic material block 22 is mounted in the housing 8 of the body 7 and sealed into the housing 8.

The housing 8 here is cylindrical in shape. The housing may have a rectangular cross section, in which case the block 22 has a complementary rectangular cross section. The block 22 is in intimate contact with the outer periphery of the housing 8 under the disk 23.

For simplicity, the housing 8 and the block 22 have a circular cross section. The block 22 is made of natural rubber or synthetic rubber made by polymerization.

In particular, block 22 is made of elastomeric material and includes natural rubber in this description. The material of block 22 is chosen to be compatible with the control fluid, which is oil in this description.

2 to 4, the block 22 is subjected to compressive stress between the rear contact in the form of the first disk 23 and the second disk 24. The first disk 23 is disposed between the cavity 9 and the block 22 in contact with the shoulder 11. The second disk 24 is held at a predetermined position in the housing 8 by a U-shaped pin.

Holes are drilled in the discs 23 and 24. The first disk 23 adjacent the cavity 9 has a hole 123 for accessing the elastic block 22. The number and size of the holes 123 vary depending on the application. Hole 123 may be an adjusted hole if necessary.

Thus, the absorption of vibration is controlled by the holes 123 associated with the stiffness of the block 22. The deformation of the block 22 is controlled by the holes 123.

The deformation of the block is facilitated by the fact that the block 22 has at least one recess 126.

2 to 4 are provided with a plurality of recesses 126.

For simplicity, only reference numerals 123 and 126 and reference numerals 124 and 25 (described below) are shown in FIG. 2.

The recesses 126 correspond to the holes 124 in the second disk 24 to ensure the flow of air. The recess 126 is open to the side of the disk 24 and a hole therein.

In use, the block 22 is compressed and expanded to absorb vibrations. This is facilitated by the recesses 126 and holes 124 to allow air to escape.

The chicane formed by the projections 16, 160 is directed towards the block 22, thereby forming an obstruction of the flow of hydraulic clutch control fluid, such as oil, to facilitate absorption.

Thus, seekens 16 and 160 limit the flow of fluid and hence the propagation of the wave. This weakens the vibration.

The main body 22 seals the main body 7 and thus has two functions.

Sealing is promoted by a second disk 24 which preloads the block 22 in intimate contact with the bore of the housing 8. This ensures a good seal.

2 to 4, the block 22 is compressed radially.

In other embodiments (members common to FIGS. 2-4 are shown with the same reference numerals 6-9), the elastic material (elastomeric) block 22 is compressed in the vertical and / or horizontal directions. do.

In the figure, the block 22 is at least partially mounted with a gap in the housing 8. There is a lateral gap between the shape of the housing and the block 22. The overall shape of the block 22 is a hat shape.

The hat-shaped central recess 226 is opened onto the second disk 24. The disk 24 has a hole therein for communicating between the recess and the outside.

For simplicity, the holes are not marked with reference numerals in the figures. 6 and 7, the disk 24 is fixed to the main body 7 by the retainer 100.

In Figures 2-4, they are secured using pins (not shown) of the same type as shown in Figure 5. This is because there is a step 25 in the main body 7, and the step 25 is similar to the step 46 in FIG.

2 to 4, the pin compresses the block 22 between the disks 23 and 24.

6 and 7, the retainer 100 compresses the rim 27 of the hat-shaped block 22, which is annular in this embodiment, between the rear contact 24 and the shoulder 127 of the housing 8. Thus, the block 22 is in intimate contact with a portion of the outer periphery of the housing.

The shoulder 127 is formed by the change in the inner diameter of the housing 8. This provides a good seal.

6 to 9, the disk-shaped contact portion 24 may be made of a metal or a plastic material, and the same is true of the first disk 23.

6 and 7, the first disk 23 is provided with a plurality of disks in contact holes of different sizes if necessary.

In FIG. 8 the rear contact is fixed by crimping. In this case, the body 7 is made of metal and the material 101 of the body 7 flows during the crimping operation.

This material then forms shoulder 102, shown in dashed lines.

In Fig. 9, the main body 7 is metal, and the rear contact 24 is fixed by welding.

2-4, 6 and 7, the contact 24 can be removed.

6 and 7, the block is deformed in the vertical direction and the horizontal direction. This deformation is controlled by selecting the height and diameter of the central portion of the hat-shaped block 22 and the size of the recess 226.

Certain variations of the block can be achieved.

Thus, in FIG. 6, the central portion of the block 22 is taller than the central portion in FIG. 7 and can therefore be further deformed in the horizontal direction.

In FIG. 8, the horizontal deformation is advantageous, and the first disk 23 does not have an opening in contact with the upper end of the block 22 in contact with it.

The holes are arranged transversely, in which case the central part of the block 22 is relatively large.

6-8, the block is mounted without compressive stress between the contact 24 and the disk (s).

The seal is provided by the rim 27 of the block 22, with the vertically projecting central portion of the seal mounted centrally with a gap in the housing.

In another embodiment (FIG. 9), the block is not subject to compressive stress and no first disk is needed. In order to provide a seal, the rim 27 has a bead 28 on its outer periphery. The beads 28 are oriented vertically and enter the grooves 128 in the body 7. The groove 128 supports the block 22 laterally and is formed in the shoulder 127 of the housing 8.

In FIG. 9, the pressure generated by the control fluid is indicated by an arrow.

As in FIG. 9, the vertically oriented beads 28 in FIG. 8 enter the grooves 128 within the shoulder 127 of the housing. Good seals are formed at all circumferences despite the horizontal deformation of the block.

Holes in the disks 23 and 24 associated with the stiffness of the block 22 control the absorption.

The second disk 24 forms a contact and can be welded, crimped or glued to the body 7 or fixed using a retainer.

In a variant embodiment the disk is clipped into place.

Of course, different shaped contacts can be used instead of the second disk. For example, the contact 24 may be a cover that closes the rear end of the housing 8 and is clipped onto the body 7.

In FIG. 8, the orifices 12, 13 are at 90 °.

Thus, the portion 4b in FIG. 1 is rigid and soldered to the orifice 13 of the body 7, and the portion 4a in FIG. 1 is flexible and protrudes vertically from the body 7. 114).

The orifice 12 forms a central passage of the connector 114 and opens into the cavity 9.

Thus, the vibration absorber constitutes a connector between two portions of the pipe.

In another embodiment, of course, the body 7 (and absorber 10) can be attached to the hydraulic or hydraulic press of the hydraulic control system, ie the vibration absorber need not be connected between the two parts of the pipe.

The absorber 10 may be molded or cast into a single unit with a hydraulic press or a pressure press.

Of course, the rear contact 24 may not have a hole therein.

If not necessary, the recess or recesses in the elastic block form a gas accumulator.

Next, block 22 may have different strain curves.

The holes in the rear contact or the first disk facilitate the predeformation of the block 22 and the material can flow into the holes.

In the embodiment of FIG. 8, the elastomeric block 22 is subjected to compressive stress vertically for the horizontal use of the block 22 due to the action of pressure changes to ensure a specific strain curve.

In FIG. 9, the cavity 9 and the housing 8 are unitary and identical.

The orifices 12, 13 open into the cavity 9, the size of which depends on the application.

Claims (8)

Clutch which forms part of a hydraulic clutch control system, which is operated by a clutch pedal and comprises a hydraulic press 3 connected by a pipe 4 to a hydraulic press 5 operating on a clutch release bearing 36 of an automobile clutch. In the vibration absorber of the pedal, A body (7) having a cavity (9) intended to be connected to a hydraulic control containing a working fluid, and an elastic material block (22) is attached to the housing (8) of the body (7), and the fluid chamber The cavity 9, which forms a recess, is defined by an elastic material block 22 which is sealed on the cavity 9 and supported on a contact 24 fixed to the body 7. 8) characterized in that it is shouldered for contacting the pierced first disk 23 disposed between the cavity 9 and the elastic material block 22. Vibration absorber of clutch pedal. The method of claim 1, The elastic material block is disposed between the contact portion 24 and the first disk 23 in a state where a compressive stress is applied. Vibration absorber of clutch pedal. The method of claim 2, The contact portion is characterized in that it consists of a penetrated second disk 24 Vibration absorber of clutch pedal. The method of claim 3, wherein The elastic material block 22 is characterized in that it comprises at least one hollow portion (126, 226) Vibration absorber of clutch pedal. The method of claim 4, wherein The contact portion 24 is characterized by having at least one hole 124 in communication with the hollow portion. Vibration absorber of clutch pedal. The method of claim 1, The elastic material block is characterized in that the hat shape Vibration absorber of clutch pedal. The method of claim 6, The hat-shaped block 22 comprises a rim 27 with a bead 28 entering a groove 128 provided in the body 8. Vibration absorber of clutch pedal. The method of claim 1, Characterized in that the cavity comprises baffles (16, 160) for directing the control fluid towards the block of elastic material (22). Vibration absorber of clutch pedal.