JP5080472B2 - Pressure control valve with built-in buffer member - Google Patents

Description

  The present invention relates to a pressure control valve having a buffer member incorporated in a hydraulic member, and more particularly to an electromagnetically actuable pressure control valve for use in the automotive field.

From German Offenlegungsschrift 10024700, an apparatus for controlling the pressure in a hydraulic circuit is known. An electrically controllable pressure control valve is provided, the pressure control valve being coupled to a magnet member having an electrically controllable coil, a mover guided movably, and a magnet member. And a hydraulic member. Within this hydraulic member, a closing member that can be loaded by a mover of the magnet member controls the pressure medium connection between at least one working passage and the return passage. A plurality of devices are provided for buffering pressure fluctuations in the working channel, in which case these devices are built-in components of the pressure control valve and in the interaction with the casing of the pressure control valve Restricting at least one pressure chamber with a variable volume arranged on the side.

  In the configuration described in the above-mentioned German Offenlegungsschrift 10024700, at least one wall of the pressure chamber is formed by an elastically deformable diaphragm. This diaphragm is integrally formed with the seal member of the pressure control valve.

  The assurance and durability of the function of the control valve, in particular the pressure control valve of the above type, over all operating conditions requires good stability of the hydraulic system to be controlled as well as good dynamic behavior with respect to high dynamics. To do. This necessitates good buffering of the media to help with pressure transmission. It has been found that buffering by utilizing mechanical friction has problems with reproducibility and inevitable hysteresis expansion. Buffers created by electromagnetic means are not sufficiently effective based on very small movements. Existing pressure transmission media in automatic transmissions, in particular the viscous buffer provided for the moment on the basis of transmission oil, have drawbacks with regard to dynamic behavior, because of the viscosity associated with the pressure transmission media. The use of elastic tension springs, compression springs and deflection springs adversely affects the pressure / current ratio of the pressure control valve. The incorporation of cushioning members based on turbulent conditions fails in construction spaces and costly production that are provided only in a limited range. Even if the hydraulic capacity in the pressure control valve is realized as a cushioning member in the control valve itself and the surrounding environment of the control valve, with or without rigidity, this requires significant construction space and thus The component to be additionally adjusted with respect to the use of a hydraulically buffered pressure control valve.

  Based on the configuration according to the invention, the pressure elastic component, preferably an elastomer molded member, is incorporated into the hydraulic member of the pressure controller which can be operated electromagnetically, so that the liquid in the hydraulic member of the pressure controller is We propose to intentionally influence the pressure capacity. The hydraulic cushioning member, which is advantageously configured as an elastomer molded member, can be used with the pressure control valve, but alternatively the cushioning member proposed by the present invention is used as a separate component. there is a possibility. Advantageously, the cushioning member is used in the form of an elastomer molded member, directly in the control zone, in the immediate vicinity of the control member.

Damping characteristics of the present invention has been proposed by, preferably fabricated as elastomeric forming member (Viton (registered trademark)) by using buffer member is independent of the viscosity of the transfer pressure medium. Furthermore, the function of the electromagnetically actuable pressure control valve formed according to the invention is not affected by any kind of pressure medium contaminants. Therefore, when the pressure control valve proposed in accordance with the present invention is used for automatic transmission gear changes in automotive applications, the pressure control valve is affected by contaminants collected in the transmission oil over the operation time of the automatic transmission. Is guaranteed not to.

  The cushioning member proposed according to the invention is advantageously manufactured as an elastomer molded member, so that the cushioning member can be manufactured with great freedom in terms of shape and size. In this case, in particular, easy joining of the buffer member can be obtained, for example, in a hydraulic flange of a pressure control valve which can be operated electromagnetically. The hydraulic capacity and the associated buffering characteristics can be particularly easily adapted to the field of use of the pressure control valve improved according to the invention. This is because the buffering characteristics of the buffer member determine the dynamic behavior of the pressure control valve based on the air content and shape of the buffer member, the material of the pressure control valve, and the joint with the hydraulic member. is there.

The shock-absorbing member for affecting the dynamics of the electromagnetically actuable pressure control valve, which can advantageously be produced as an elastomer-molded member, has a high degree of elasticity, so that pressure pulsations in the hydraulic pressure transmission section Can be significantly buffered. The buffer member is preferably fabricated as a foaming FKM elastomer molding member (Viton (registered trademark)), and by extension can be fabricated in a variety of shapes and sizes. This material used is excellent in terms of high medium durability and temperature durability. The durability of the cushioning member proposed according to the invention, preferably usable in a hydraulic flange, is ensured on the one hand by a closed cell structure surrounded by a closed skin. The cushioning member proposed according to the invention has an air content of up to 30%, in which case the air content may vary by 5-10%. The air content of the cushioning member proposed by the present invention defines the buffering properties of this cushioning member and can be particularly easily adapted for a wide variety of hydraulic environments in which the cushioning member proposed by the present invention is used. .

  In addition to being used in pressure control valves used in automobiles for automatic transmission gear changes, the buffer member is based on its high medium durability and temperature durability, such as brake fluid, hydraulic oil, fuel or water, etc. May be exposed to another pressure transmission medium. Furthermore, it is fully conceivable to use the cushioning member proposed according to the invention in a component other than the electromagnetically actuable pressure control valve.

In the following, embodiments of the invention will be described in detail with reference to the drawings.

  FIG. 1 shows a cross-sectional view of a pressure control valve that can be operated electromagnetically, and a buffer member is inserted in a hydraulic pressure flange of the pressure control valve.

  The pressure control valve 10 shown in FIG. 1 has an electromagnet 12, and the electromagnet 12 has a magnetic coil 14. The pressure control valve 10 shown in FIG. 1 is used in particular in automatic transmissions of automobiles and is useful for changing gears of this automatic transmission.

  The electromagnetically actuable pressure control valve 10 has a casing 16, and a movable element guide 18 is formed in the casing 16 by being surrounded by a magnetic coil 14. The movable element 20 of the pressure control valve 10 is guided in the movable element guide 18. The mover 20 loads the plunger 24. In the hydraulic flange 32, a seal member 34 inserted in the peripheral surface 36 of the hydraulic flange 32 is located. This seal member 34 is configured as an O-ring in FIG.

The hydraulic flange 32 has a notch 52 that functions as a hollow chamber, and a molding member 50 is inserted into the notch 52 in FIG. 1, and this molding member 50 serves as a hydraulic buffer member. The molding member 50 is fabricated, the side opposite to the plunger 24, that is, the open side of the hydraulic flange 32, as has a raised rounded and preferably elastomeric molding member (Viton molding member (R)) Is done. The molded member 50 shown in FIG. 1 protrudes beyond the end face of the hydraulic flange 32 over the protruding dimension indicated by reference numeral 74.

  2a and 2b show cross-sectional views of an electromagnetically actuable hydraulic flange.

  From FIG. 2a it can be seen that the plunger 24 is guided at the part of the mover 20 of the pressure control valve 10 which serves as a bearing. Mounted on the plunger 24 is a disk 54 that serves as a closure member and is coupled to the plunger 24. In the notch formed in the peripheral surface of the hydraulic flange 32, a sealing member in the form of an O-ring 34 useful for sealing is located. The hydraulic flange 32 has a notch 52, and a molding member 50 is inserted into the notch 52. In this case, the molding member 50 is pushed into the notch 52 by hydraulic fluid. The molded member 50 shown in FIG. 2a can be made on the one hand from a closed cell structure 60, which is surrounded by a medium-durable outer skin 58 and has a rounded inner wall. Have. FIG. 2b shows a molded member 50 with a rounded inflow portion having a hydraulic damping characteristic, which is again a closed cell structure 60 and a medium durable skin. 58. The molding member 50 shown in FIGS. 2a and 2b has a separate screen filter 51 on its open side. The hydraulic flange 32 has a ring 53 having a through hole, and this ring 53 can be opened and closed by a closing member 54.

  FIG. 3 shows a cross-sectional view of a pressure control valve that can be operated electromagnetically.

  It can be seen from FIG. 3 that the pressure control valve 10 has a hydraulic member 22 below the electromagnet 12. The closing member 24 is operated together with the disk attached to the closing member 24 by the mover surrounded by the magnetic coil 14 shown in FIG. 3, and the hole 30 shown in FIG. 3 is opened and closed through the disk. can do. In FIG. 3, the hole 30 is opened, and the hydraulic fluid flows into the work passage A from the inflow passage P. When the mover 20 operates, the closing member 54 is pressed toward the opening of the hole 30 to close the hole 30. It is no longer possible for hydraulic fluid to flow out into the working channel A through the hole 30.

  The hydraulic member 22 of the electromagnetically actuable pressure control valve 10 shown in FIG. 3 has a first O-ring 44 that serves as a seal and a second O-ring 46 that also serves as a seal. . A buffer ring 40 is attached to the outer peripheral surface of the hydraulic member 22 between the O-rings 44 and 46. The buffer ring 40 shown in FIG. 3 may on the one hand have a closed cell structure 60 which is surrounded by a medium-durable skin 58. The hollow chamber limited by the casing wall 42 is filled with hydraulic fluid. Since both the external hydraulic buffer 38 and the hydraulic buffer ring 40 serve as a capacity in the oil column and buffer pressure pulsations in the oil column, the inflow passage P, the work passage A, and the hydraulic member 22 are used. The return passage R is effectively protected from peak pressure loads and the associated mechanical loads. Both the external hydraulic buffer pair 38 and the hydraulic buffer ring 40 are manufactured as a molded member 50 as described in FIGS. 2a and 2b, for example, and act as hydraulic buffer members based on their air content. .

  FIG. 4 shows another embodiment of the molded member proposed according to the invention.

  The hydraulic flange 32 of the pressure control valve 10 shown in FIGS. 1 and 3 is only suggested schematically in FIG. 4 and is a notch that serves to accommodate a forming member 50 that serves as a hydraulic cushioning member. 52. On the peripheral surface 36 of the hydraulic flange 32, an O-ring 34 inserted in the peripheral groove and serving as a seal member is located. The hydraulic fluid flows through the ring 53 surrounded by the hydraulic flange 32 (see FIG. 3).

A molding member 50 is inserted into the notch 52 of the hydraulic flange 32 shown in FIG. The molded member 50 has a roundness 66 on the open side of the hydraulic flange 32 and protrudes beyond the end face of the hydraulic flange 32 by a protruding dimension 74. The molding member 50 acting as a hydraulic buffer member has a medium durable outer skin 58 that surrounds the closed cell structure 60. The molded member 50 is in contact with the corresponding inner surface of the hydraulic flange 32 on the outer peripheral surface or the back side of the rounding 66, and this inner surface limits the notch 52 of the hydraulic flange 32. The molding member 50 shown in FIG. 4, in particular foam is an FKM elastomer molding member (Viton (registered trademark)) and in a variety of formats, can be adapted to the geometry of the notch 52 of the hydraulic flange 32. The molded member 50 illustrated in FIG. 4 has an air content of up to 30% + / − 10%.

  In FIG. 4, the cushioning characteristics of the molded member 50 inserted into the hydraulic flange 32 are related on the one hand to the protruding dimension 74 of the cushioning member 50 beyond the end face of the hydraulic flange 32 and on the other hand the air content and the skin. Related to the dimensioning of the thickness of the skin 58 with respect to the closed cell structure 60 surrounded by 58.

  4.1 to 4.3 show a variety of connection variations of shape connection type, and by these connection variations, for example, the molded member 50 shown in FIG. It can be combined with an expression.

  FIG. 4.1 shows, for example, a connecting part 100 having a shape connection type. In this connecting part 100, at least one, preferably a plurality of dovetail pins are integrally formed on the molding member 50. These pins cooperate with corresponding notches 104 in the hydraulic flange 32. In the shape-connecting coupling variant shown in FIG. 4. 1, the shock-absorbing member 50, which is preferably formed as an elastomer-molded member, can be joined to the hydraulic flange 32 in a particularly simple manner.

  The same applies to the shape-connected coupling variation shown in Fig. 4.2. In this variation, a plurality of rounded pins 106 are located on the molded member 50 and these pins 106 are engaged with corresponding notches in the hydraulic flange 32 so that the molded member 50 is It is easily assembled into the hydraulic flange 32. The same applies to the variation of the shape connection type coupling part 100 shown in FIG. 4.3. In this variation, at least one, preferably a plurality of pins 108 having a rhombus profile are integrally formed on the forming member 50. These diamond-shaped pins 108 engage the complementary openings 110 formed in the hydraulic flange 32.

  All variations of the shape connection type coupling part 100 shown in FIGS. 4.1 to 4.3 are simple and automatable joining of the molded member 50 to the hydraulic flange 32 shown in FIG. 1 or FIG. Enable. This makes it possible to use molded members 50 that act as hydraulic buffer members, which are particularly easily inserted in terms of built-in technology, and these molded members 50 can affect the buffer characteristics of the hydraulic system. To.

  FIG. 5 shows another embodiment of a hydraulic buffer 50 proposed according to the invention, preferably formed as a molded part.

  From FIG. 5, it can be seen that the built-in screen filter woven fabric 56 is incorporated in the molding member 50. Unlike the embodiment shown in FIG. 4, the molding member 50 shown in FIG. 5 forms a closed molding member, and the closed molding member defines a hollow chamber surrounded by the molding member 50. Since the screen filter woven cloth 56 is closed to the outside, inflow fluid pressure fluid such as transmission oil of an automatic transmission is forced before passing through the inflow passage P shown in FIG. The contaminants remain outside the incorporated screen filter 56. The molding member 50 shown in FIG. 5 is fixed to the outer peripheral surface of the hydraulic flange 32 by a locking lip 68. The hydraulic flange 32 has a ring 53 with a through hole for hydraulic fluid. The molding member 50 shown in FIG. 5 also has a medium-durable outer skin 58, which encloses the closed cell structure 60 of the molding member 50. The inner peripheral surface of the molded member 50 is indicated by reference numeral 62. An O-ring 34 useful for sealing is located on the outer peripheral surface 36 of the hydraulic flange 32. Further, it can be seen from FIG. 5 that the roundness 66 of the end face of the molded member 50 and the incorporated screen filter fabric 56 protrude beyond the end face of the hydraulic flange 32 by a predetermined protrusion dimension 74.

  FIG. 6 shows another embodiment of the cushioning member proposed in accordance with the invention, which is advantageously made as an elastomer molded member.

From FIG. 6, the hydraulic flange 32 has a notch 82 on its peripheral surface 36, and a seal member in the form of an O-ring 72 integrated with the molding member 50 is engaged with the notch 82. It turns out that there is. The hydraulic flange 32 shown in FIG. 6 is further provided with a diameter step 70. Based on this, the molding member 50 preferably is fixed by the form-expression shifts to one another in the region of the diameter step portion 70, and has a first diameter D ₁ and second diameter D ₂ . Locking of the molded member 50, shown in FIG. 6, which has a closed cell structure 60 and a medium durable outer skin 58 surrounding the closed cell structure 60, shown in FIG.

  FIG. 7 shows another embodiment of a joint between a buffer member formed as a molded member and a hydraulic flange.

  In FIG. 7, the forming member 50 is attached to the hydraulic flange 32 in a shape connection by a caulking fastening portion 78 on the end face side. The molding member 50 has a medium durable skin 58 that surrounds the closed cell structure 60. A ring 53 provided with a through hole for hydraulic fluid provided in the hydraulic flange 32 can be opened and closed via a closing member 54. The caulking fastening portion 78 on the end face side of the molding member 50 is formed so that an alignment surface 76 is formed between the end face of the hydraulic flange 32 and the end face of the molding member 50 that is caulked and fastened to the hydraulic flange 32. Yes. Reference numeral 62 indicates the inner peripheral surface of the molded member 50 that is caulked and fastened to the hydraulic flange 32. For the sake of completeness, an O-ring 34 is inserted as a seal member on the peripheral surface 36 of the hydraulic flange 32 shown in FIG.

  Finally, FIG. 8 shows another coupling variation between the forming member acting as a buffer member and the hydraulic flange.

  In the embodiment shown in FIG. 8, the molding member 50 is coupled to the hydraulic flange 32 by a shape connection type by a caulking fastening portion 80 on the peripheral surface side. An O-ring 34 inserted into the notch 82 is provided on the peripheral surface 36 of the hydraulic flange 32. Based on the caulking fastening portion 80 on the circumferential surface side according to the embodiment shown in FIG. 8, the protrusion dimension 74 described above is obtained between the roundness 66 of the end face of the molded member 50 and the end face of the hydraulic flange 32. The projecting dimension 74 affects the hydraulic buffering characteristics according to the closed cell structure 60 of the molding member 50 acting as a buffering member or the compressibility of the air content. The hollow chamber 52 of the hydraulic flange 32 is limited by the inner peripheral surface 62 of the molding member 50 attached to the hollow chamber 52 by a caulking fastening portion 80 on the peripheral surface side in a shape connection manner.

It is the figure which showed the pressure control valve which can be act | operated by an electromagnetic type which was equipped with the hydraulic pressure flange and was equipped with the buffer member proposed based on this invention inside. 2a and 2b are partial views of a hydraulic flange incorporating a cushioning member. It is sectional drawing of the hydraulic pressure flange of a pressure control valve, In this case, the external hydraulic pressure buffer member is correspondingly arrange | positioned at the hydraulic pressure flange. FIG. 4 is a view showing a first embodiment of the hydraulic buffer member inserted into the hydraulic flange, and FIGS. 4.1 to 4.3 show a configuration between the hydraulic buffer member and the hydraulic flange. It is the figure which showed the coupling | bonding of the various shape connection type. It is the figure which showed another Example of the hydraulic-pressure buffer member proposed by this invention incorporating the screen filter fabric. It is the figure which showed the shock absorbing member proposed by this invention with which the sealing member was integrated. It is the figure which showed the shock absorbing member crimped and fastened to the end surface of a hydraulic pressure flange. It is the figure which showed the buffer member proposed based on this invention position-fixed to the hydraulic flange via the caulking fastening performed by the surrounding surface of the buffer member.

Claims (9)

A pressure control valve (10) for controlling the pressure in the hydraulic circuit, comprising an electromagnet (12) having an electrically controllable coil (14), a mover (20) guided movably, and A hydraulic member (22) is provided, and the hydraulic member (22) is provided with a work passage (A) and a return passage (R). 20), the closing member (54) operable via the control passage controls the pressure medium connection between the working passage (A) and the return passage (R), and further the hydraulic member (22) has a hydraulic flange ( 32) in the type provided
Inside the working passage (A) and in the immediate vicinity of the closing member (54), a hydraulic pressure buffer member (40, 50) configured as an elastomer molding member is provided on the hydraulic pressure flange (32) or the hydraulic pressure member (22). are arranged, the liquid pressure shock member being loaded by the pressure of the hydraulic fluid,
The hydraulic buffer (40, 50) has a closed cell structure (60) surrounded by a medium-durable skin (58);
The cushioning member (50) projects beyond the end face of the hydraulic flange (32) by a predetermined projection dimension (74) at the roundness (66) or end face (64). Built-in pressure control valve. 2. The pressure control valve according to claim 1, wherein the buffer member (40, 50) has an air content of 10% to 50 % . The pressure control valve according to claim 2, wherein the buffer member (40, 50) has an air content of 20% to 40% .   The pressure control valve according to claim 1, wherein the cushioning member (50) has a screen filter fabric (56) incorporated therein.   The pressure control valve according to claim 1, wherein the buffer member (50) is secured to the peripheral surface (36) of the hydraulic flange (32) by a locking lip (68) or an incorporated sealing member (72).   A joint (100) having a shape connection type between the hydraulic flange (32) and the shock absorbing member (50) is formed in the shock absorbing member in a dovetail shape, rounded or rhombus shaped pins (102, 106, The pressure control valve according to claim 1, configured as 108), wherein these pins cooperate with complementary openings in the hydraulic flange (32).   The pressure control valve according to claim 1, wherein the buffer member (50) is coupled to the hydraulic flange (32) via a caulking fastening portion (78) on an end face side.   The pressure control valve according to claim 1, wherein the buffer member (50) is coupled to the hydraulic flange (32) via a caulking fastening portion (80) on the circumferential surface side. With a pressure control valve of any one of claims 1 to 8 (10), a control device for a motor vehicle automatic transmission.

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