Separation system

Abstract

The present invention relates to a separation system for a dry clutch, particularly for motor vehicles, having a housing (1) in which a piston (2) is linearly movably accommodated in a pressure chamber (1c) of the housing (1), wherein an annular seal (3) is introduced in a recess (2a) of a piston wall portion (2b) facing the housing (1) or in a recess (1a) of a housing wall portion (1b) facing the piston (2), the annular seal sealing the internal space (1c) outward, and wherein the annular seal (3) has a support section (3a) abutting against the recess (2a; 1a) and a lip section (3b) bent toward the support section (3a), characterized in that the support section (3a) is provided with at least one protrusion (3c), the protrusion being shaped to fit within an arched portion (2aa; 1aa) of the recess (2a; 1a).

Description

Technical Field

[0001] This invention relates to a disengagement system for a dry clutch in a motor vehicle. Background Technology

[0002] Typically, this separation system is rotatably supported, meaning it rotates along with the drive shaft of the vehicle as it rotates. Summary of the Invention

[0003] The purpose of this invention is to provide a separation system that ensures sufficient sealing even at high rotational speeds.

[0004] The objective is achieved through the following separation system.

[0005] The separation system according to the invention, particularly for dry clutches used in motor vehicles, has a housing in which a piston is linearly movably accommodated in a pressure chamber 1c of the housing along the axial direction of the housing. An annular seal is introduced in a recess facing the piston wall portion of the housing or in a recess facing the housing wall portion of the piston, the annular seal sealing the internal space outwards. The annular seal has a support section abutting against the recess and a lip section bent toward the support section. The support section is characterized by having at least one protrusion whose shape is fitted into an arched portion of the recess. The protrusion, for example, can have a semi-circular cross-section.

[0006] According to one implementation, there are at least two protrusions that are parallel to each other.

[0007] Preferably, the length l of at least one protrusion is at most approximately one-fifth of the length L of the lip segment. This means that at least one protrusion is constructed to be shorter than the lip segment.

[0008] In one embodiment, the housing may include a first housing protrusion and a second housing protrusion extending parallel to each other in an axial direction, wherein the piston is shaped such that a first wall segment slides along the second housing protrusion during linear piston movement, and a second wall segment slides along the first housing protrusion, wherein the second wall segment is at least partially part of a receiving portion that accommodates the first housing protrusion, and wherein a second annular seal is present, the second annular seal being respectively accommodated in recesses of the housing wall portions of the first housing protrusion and the second housing protrusion facing the piston.

[0009] Here, each housing protrusion can accommodate a sliding sealing ring, wherein one of the sliding sealing rings is disposed on the same side of the corresponding housing protrusion, offset from one of the annular seals in the axial direction.

[0010] This relates to the arrangement of the sliding sealing ring with respect to the annular seal, where in the first housing protrusion, the sliding sealing ring is positioned axially below the annular seal, and in the second housing protrusion, the sliding sealing ring is positioned axially above the annular seal.

[0011] According to another embodiment, the housing has a first housing protrusion extending in an axial direction, wherein the piston includes a recess that at least partially accommodates the first housing protrusion, wherein an annular seal is introduced into the recess of the piston wall portion toward the first housing protrusion of the housing.

[0012] In the embodiment described, the sliding sealing ring is accommodated in the first housing protrusion in a radial direction, offset from the annular seal, and slides along the wall opposite to the piston wall portion of the piston's recess during axial movement of the piston.

[0013] In another embodiment of the separation system according to the invention, the housing has: a central cylindrical section that surrounds a cylindrical pressure chamber region containing the longitudinal axis X of the separation system; and radially extending branch sections, wherein a piston covers the cylindrical pressure chamber section at one end and the radially extending branch sections of the housing on its upper side, and wherein the branch sections have radially extending outer walls that extend in an axial direction, and recesses are present in the radially extending outer walls, in which the annular seal is introduced, wherein an axial end wall section of the piston slides along the radially extending outer wall of the branch sections of the housing during its linear movement.

[0014] According to this embodiment, the sliding sealing ring can be axially accommodated below the annular seal in the radial outer wall of the branch section of the housing. Attached Figure Description

[0015] Possible embodiments of the invention will now be described in detail with reference to the accompanying drawings.

[0016] As shown in the attached figure:

[0017] Figure 1 A cross-sectional view is shown throughout the separation system according to a first embodiment of the present invention;

[0018] Figure 1a A perspective view of an annular seal is shown, which is used in an embodiment according to the invention;

[0019] Figure 1b A perspective view of the sliding sealing ring is shown;

[0020] Figure 1c A cross-sectional view is shown through the annular seal used;

[0021] Figure 2 A cross-sectional view is shown throughout the separation system according to a second embodiment of the present invention;

[0022] Figure 3 A cross-sectional view is shown throughout the separation system according to a third embodiment of the present invention;

[0023] Figure 4 A cross-sectional view is shown throughout the separation system according to a fourth embodiment of the present invention;

[0024] Figure 5 A cross-sectional view is shown throughout the separation system according to a fifth embodiment of the present invention. Detailed Implementation

[0025] Reference Figure 1 and 1a Up to 1c, the first embodiment of the present invention will now be described, wherein it should be noted that, Figures 1a to 1c The view also applies to all other implementations.

[0026] exist Figure 1 The separation system is shown in cross-section, and is configured to be rotationally symmetrical about a central axis or longitudinal axis X. The longitudinal axis X defines the axial direction, while the direction perpendicular to it is referred to below as the radial direction. The terms "above" and "below" as used in this application refer to the direction "left" or "right" in the figures. Generally, if pressure is applied to the pressure chamber 1c, the direction of axial movement of the piston 2 is indicated by the term "upward".

[0027] The accompanying drawings show only half of the cross-section extending above the central axis in the figures. The separation system, as a main component, includes a housing 1 and a piston 2 housed therein, movable about the housing 1 to perform axial linear movement when pressure is applied to the pressure chamber 1c of the housing 1, thereby moving the components of the vehicle clutch that are in direct or indirect contact with the piston 2, allowing the vehicle clutch to disengage or engage. Furthermore, an annular seal 3 is present, used to seal the pressure chamber 1c outwards.

[0028] The separation system shown here is a rotating central separator, which is configured to rotate along with the transmission shaft 4 when the transmission shaft 4 rotates. The housing 1 here is a machined housing 1, wherein the piston 2 can be configured as a plate ring piston.

[0029] In the illustrated embodiment, the housing includes a first housing protrusion 1d and a second housing protrusion 1e, which extend parallel to each other in an axial direction. Here, the first housing protrusion 1d is located radially outside the second housing protrusion 1e. A pressure chamber 1c extends about the central axis X in a first region and radially outward between the housing 1 and the piston 2 in a second region. The piston 2 is configured such that a first wall segment 2c slides along the second housing protrusion 1e during linear movement of the piston 2, and the second wall segment 2e slides along the first housing protrusion 1d. In other words, the piston... Figure 1 As can be seen, it extends radially outward from the second housing protrusion 1e, wherein the piston axially covers the housing 1 above between the second and first housing protrusions 1e, 1d, thereby axially closing the pressure chamber 1c upward.

[0030] The second wall segment 2e, which slides along the first protrusion 1d during the linear movement of the piston 2, is a portion of the receiving portion 2d that at least partially accommodates the first housing protrusion 1d. In other words, the piston 2 forms an arcuate portion, in the form of a "U," in the region of the first housing protrusion 1d, which axially covers the first housing protrusion 1d from above. Radially outside the region of the receiving portion, the end region of the piston connects to components of the clutch so as to disengage or engage the clutch during the linear movement of the piston.

[0031] If pressure chamber 1c is pressurized by introducing a pressurized fluid, then piston 2 moves upward in the axial direction, i.e., to the left in the illustrated figures, whereby wall segments 2c, 2e slide along the sides of housing protrusions 1d, 1e facing the wall segments. As can also be seen in this, in the illustrated embodiment, there are two annular seals 3, which are respectively received in the recesses 1a of the housing wall portions 1b facing piston 2 in the first housing protrusion 1d and the second housing protrusion 1e, and these annular seals are used to seal pressure chamber 1c to prevent pressure fluid loss and to prevent impurities from entering. Figure 1a As can be seen, the annular seal according to the present invention is configured to have: a support section 3a, by means of which the annular seal is supported in the housing 1 or the piston 2; and a lip section 3b, which slides along the piston 2 when the annular seal 3 is supported in the housing 1 during linear movement of the piston 2, or slides along the housing 1 when the annular seal 3 is supported in the piston 2. The lip section 3b is bent relative to the support section 2a to improve stability. In the illustrated embodiment, another lip section is present. The annular seal 3 is also referred to as a grooved sealing ring.

[0032] As already mentioned, the separation system rotates when the transmission shaft 4 of the vehicle rotates, which is shown in the lower right of the figure. To ensure the sealing of the pressure chamber 1c even at high speeds of approximately 6000 rpm in a pressureless state, the annular seal 3 has at least one protrusion 3c at its support section 3a4, and in the illustrated embodiment, two protrusions 3c. These protrusions preferably extend on one side of the lip section 3b, i.e., on the inner side of the annular seal 3. The protrusion 3c here has a semi-circular cross-section, although other cross-sectional shapes are also possible. Furthermore, the length l of the protrusion 3c, i.e., the radius of the semicircle in the illustrated embodiment, is significantly smaller than the length L of the lip section 3b. This prevents leakage even when the annular seal 3 loosens or ages due to temperature changes.

[0033] This is illustrated in the diagram where the annular seal 3 is supported in the housing 1 or on the piston 2. Figure 1c Ideally visible, the housing 1 or piston 2 has a recess 1a or 2a into which the annular seal 3 is inserted by means of its supporting section. To form-fit at least one protrusion 3c, a corresponding arch 1aa or 2aa is preferably present in the housing 1 or piston 2, preferably in the recess 1a or 2a, the arch corresponding to the shape of at least one protrusion 3c, i.e., having a semi-circular cross-section.

[0034] Re-reference Figure 1 In the first embodiment of the present invention, the recess 1a is respectively introduced into the housing wall portion 1b facing the piston 2, that is, on the radially outer wall in the second housing protrusion 1e and also on the radially outer wall in the first housing protrusion 1d.

[0035] Furthermore, each housing protrusion 1d, 1e accommodates a sliding sealing ring 5, wherein one of the sliding sealing rings 5 ​​is axially offset from one of the annular seals 3 on the same side of the respective housing protrusion 1d, 1e. As can be seen, on the first housing protrusion 1d, the sliding sealing ring 5 is axially positioned below the annular seal 3, while on the second housing protrusion 1e, the sliding sealing ring 5 is axially positioned above the annular seal 3. In other words, the two sealing rings (the annular seal 3 and the sliding sealing ring 5) are arranged differently relative to each other on the two housing protrusions 1d, 1e. Therefore, optimized sealing can be ensured in a space-saving manner.

[0036] One possible implementation of the sliding sealing ring 5 is in Figure 1bEach embodiment of the separation system described herein is shown and can be used in the embodiments described herein. Because the sliding sealing ring 5 is generally inelastic in contrast to the radial seal 3 shown herein, the sliding sealing ring is typically configured with an open slit 5a, thereby facilitating insertion into the corresponding annular receptacle of the housing 1 or piston 2. The stepped configuration of the open slit 5a, as shown herein, ensures additional protection against contamination.

[0037] Now refer to Figure 2 A second embodiment of the separation system according to the invention is described. The separation system is configured such that the housing 1 has a first housing protrusion 1d extending in an axial direction, wherein the piston 2 includes a receiving portion 2d that at least partially receives the first housing protrusion 1d. Radially outside the region of the receiving portion 2d, one end of the piston 2 is connected to a clutch component to operate the clutch during linear motion.

[0038] The annular seal 3 is introduced into the recess 2a of the piston wall portion 2b facing the first housing protrusion 1d of the housing 1. Within the recess 2a are two arched portions 2aa for accommodating the two protrusions 3c of the annular seal 3 (see...). Figure 1a and 1c In this embodiment, the housing 1 and piston 2 can be formed by cutting. A sliding sealing ring 5 is also present, which, in this embodiment, is radially offset from the annular seal 3 and housed in the first housing protrusion 1d. Unlike the previously described embodiments, here, the annular seal 3 is housed in the piston 2 and only the sliding sealing ring 5 is housed in the housing 1. During axial movement of the piston 2, the sliding sealing ring 5 slides along the wall of the recess 2d of the piston 2 opposite to the piston wall portion 2b. In this embodiment, there is no second seal in the region of the transmission shaft 4.

[0039] Reference Figure 3Another embodiment of the invention is shown, wherein the housing 1 is a machined housing and the piston 2 is a plate-ring piston. The housing 1 here has: a central cylindrical section 1f that surrounds a cylindrical pressure chamber region 1c1 containing the longitudinal axis X of the separation system; and a radially extending branch section 1g, wherein the piston 2 covers the cylindrical pressure chamber region 1c1 at one end and the radially extending branch section 1g of the housing 1 on its upper side. The branch section 1g has a radial outer wall 1h that extends axially, and a recess 1a is present in the radial outer wall, in which the annular seal 3 is introduced. The axial end wall section 2f of the piston 2 slides along the radial outer wall 1h of the branch section 1g of the housing 1 during its linear movement. The end wall section 2f is bent toward its end (approximately 90° here) to support components of the clutch for engaging and disengaging the clutch. There is no second sealing portion, i.e., no sealing ring, in the region of the transmission shaft 4.

[0040] The sliding sealing ring 5 is axially housed below the annular seal 3 in the radial outer wall 1h of the branch section 1g of the housing 1. Therefore, both the radial seal 3 and the sliding sealing ring 5 are housed in the housing 1, allowing the piston 2 to be constructed thinly in this location.

[0041] Another embodiment of the present invention is in Figure 4 As shown. Here, housing 1 includes a first housing protrusion 1d and a second housing protrusion 1e, which extend axially and are radially spaced apart from each other. The housing protrusions 1d and 1e are configured in a generally mirror-symmetrical manner. Piston 2 forms two receiving portions 2d, each of which at least partially receives one of the housing protrusions 1d and 1e, wherein a radially extending piston segment 2g extends between the two receiving portions 2d. Thus, the piston, together with the receiving portions 2d, is also configured symmetrically, wherein, however, the radially outer end of piston 2 is bent, for example at a 90° angle, so as to abut against the components of the clutch. The radially extending piston segment 2g axially covers the pressure chamber (1c) above, such that when pressure is applied through the pressure chamber 1c, piston 2 is lifted axially (to the left in the figure). A recess 2a for one annular seal 3 is introduced into a piston wall portion 2b2 facing the radial outer wall of the second housing protrusion 1e, and a recess 2a for another annular seal 3 is introduced into a piston wall portion 2b1 facing the radial inner wall of the first housing protrusion 1d.

[0042] In this embodiment, one sliding sealing ring 5 is introduced into the radial outer wall of the first housing protrusion 1d and the radial inner wall of the second housing protrusion 1e. Thus, two annular seals 3 are accommodated in the piston 2, while the two sliding sealing rings 5 ​​are supported in the housing 1.

[0043] Reference Figure 5 Another embodiment of the invention is shown. The housing 1 here forms an annular pressure chamber 1c that opens axially upward (to the left in the figure). When using the separation system, the separation system is screwed onto the wall of the transmission. The housing 1 includes: an outer wall 1h that radially outwardly defines the pressure chamber 1c; and an inner wall 1i that radially inwardly defines the pressure chamber 1c, wherein the inner wall 1i extends radially outward from the longitudinal axis X of the separation system. This indicates that the pressure chamber 1c does not include the longitudinal axis X. The inner wall 1i here is stepped and includes a first inner wall segment 1i1 and a second inner wall segment 1i3 extending radially inward from the first inner wall segment 1i1, and a stepped wall segment 1i2 connecting the two inner wall segments 1i1, 1i3. As can be seen, the inner wall 1i continues axially upward (to the left in the figure) as an outer wall.

[0044] Axially upward, the pressure chamber 1c is limited by the piston 2, which is preloaded to the axial position by a preload spring 6. Here, two annular seals 3 are accommodated in the piston 2, each abutting the inner wall 1i and outer wall 1h of the housing 1 from the inside. A recess 2a for one annular seal 3 is correspondingly introduced into the piston wall portion 2b3 facing the outer wall 1h of the pressure chamber 1c, and a recess 2a for the other annular seal 3 is introduced into the piston wall portion 2b4 facing the first inner wall segment 1i1 of the pressure chamber 1c. Furthermore, each sliding sealing ring 5 is accommodated axially above the corresponding annular seal 3 in each of the piston wall portions 2b3 and 2b4. Thus, the annular seals 3 and sliding ring seals 5 are located within the piston 2. The housing 1 and piston 2 are here manufactured by cutting.

[0045] This embodiment is characterized by having an overhang 2h in the piston wall portions 2b3 and 2b4, which downwardly restricts the axial movement of the annular seal 3. However, the overhang can also be used in conjunction with other embodiments shown herein, and in particular prevents the seal from slipping during operation.

[0046] Explanation of reference numerals in the attached figures

[0047] 1. Shell

[0048] 1a concave part

[0049] 1aa Arched part

[0050] 1b Shell wall portion

[0051] 1c pressure chamber

[0052] 1c1 cylindrical pressure chamber region

[0053] 1c2 Variable pressure chamber region

[0054] 1d First shell protrusion

[0055] 1e Second housing protrusion

[0056] 1f Central column section

[0057] 1g branch segment

[0058] 1h outer wall

[0059] 1i Inner Wall

[0060] 1i1 First Inner Wall Section

[0061] 1i2 stepped section

[0062] 1i3 Second Inner Wall Section

[0063] 2 pistons

[0064] 2a recess

[0065] 2aa Arched part

[0066] 2b Piston wall section

[0067] 2b1 Piston Wall Section

[0068] 2b2 Piston Wall Section

[0069] 2b3 Piston Wall Section

[0070] 2b4 Piston Wall Section

[0071] 2c First wall section

[0072] 2d containment section

[0073] 2e Second wall section

[0074] 2f Axial end wall section

[0075] 2g radial piston section

[0076] 2h Exceeding Part

[0077] 2. Seals

[0078] 3a Support section

[0079] 3b Lip segment

[0080] 3C protrusion

[0081] 3. Gearbox Shaft

[0082] 4. Sliding sealing ring

[0083] 5a Opening slit

[0084] 5. Preload spring

Claims

1. A release system for a dry clutch of a motor vehicle, having a housing (1), wherein a piston (2) is accommodated linearly movable in an axial direction of the housing (1) in a pressure chamber (1c) of the housing (1), wherein a ring seal (3) is introduced in a recess (2a) of a piston wall portion (2b) facing the housing (1) or in a recess (1a) of a housing wall portion (1b) facing the piston (2), which ring seal seals the pressure chamber (1c) outwardly, and wherein the ring seal (3) has a support section (3a) resting in the recess (2a; 1a) and a lip section (3b) bent toward the side of the support section (3a) on which the pressure chamber is located, characterized in that the support section (3a) is formed with at least one protrusion (3c) on the same side as the lip section, which protrusion is accommodated form-fittingly in an arch (2aa; 1aa) of the recess (2a; 1a).

2. The release system according to claim 1, characterized in that there are at least two protrusions (3c) parallel to one another.

3. The release system according to claim 1, characterized in that the length I of the at least one protrusion (3c) is at most one fifth of the length L of the lip section (3b).

4. The release system according to claim 1, characterized in that the housing (1) comprises a first housing protrusion (1d) and a second housing protrusion (1e) extending parallel to one another in the axial direction, wherein the piston (2) is shaped such that a first wall section (2c) slides along the second housing protrusion (1e) and a second wall section (2e) slides along the first housing protrusion (1d) when the piston (2) is linearly moved, wherein the second wall section (2e) is part of an accommodation (2d) which at least partially accommodates the first housing protrusion (1d), and wherein there are two ring seals (3) which are each accommodated in a recess (1a) of the housing wall portion (1b) facing the piston (2) of the first housing protrusion (1d) and of the second housing protrusion (1e).

5. The release system according to claim 4, characterized in that a sliding seal ring (5) is accommodated in each housing protrusion (1d, 1e), wherein each one of the sliding seal rings (5) is arranged on the same side of the respective housing protrusion (1d, 1e) in the axial direction offset from one of the ring seals (3) in the axial direction.

6. The release system according to claim 5, characterized in that on the first housing protrusion (1d), the sliding seal ring (5) is arranged below the ring seal (3) in the axial direction, and on the second housing protrusion (1e), the sliding seal ring (5) is arranged above the ring seal (3) in the axial direction.

7. The release system according to any one of claims 1 to 3, characterized in that The housing (1) has a first housing protrusion (1d) which extends in axial direction, wherein the piston (2) comprises a recess (2d) which at least partially accommodates the first housing protrusion (1d), wherein the annular seal (3) is introduced into a recess (2a) of a piston wall portion (2b) which faces the first housing protrusion (1d) of the housing (1).

8. Separating system according to claim 7, characterized in that a sliding seal ring (5) is accommodated in the first housing protrusion (1d) in radial direction offset to the annular seal (3) and slides along a wall of the recess (2d) of the piston (2) which is opposite to the piston wall portion (2b) upon axial movement of the piston (2).

9. Separating system according to any of claims 1 to 3, characterized in that the housing (1) has a central cylindrical section (1f) which encloses a cylindrical pressure chamber region (1c1) which contains a longitudinal axis X of the separating system, a radially extending branch section (1g), wherein the piston (2) covers the cylindrical pressure chamber region (1c1) at one end thereof and the radially extending branch section (1g) of the housing (1) on its upper side, and wherein the branch section (1g) has a radial outer wall (1h) which extends in axial direction, in which a recess (1a) is present into which the annular seal (3) is introduced, wherein an axial end wall section (2f) of the piston (2) slides along the radial outer wall (1h) of the branch section (1g) of the housing (1) upon linear movement thereof.

10. Separating system according to claim 9, characterized in that a sliding seal ring (5) is accommodated in the radial outer wall (1h) of the branch section (1g) of the housing (1) axially below the annular seal (3).

11. Separating system according to any of claims 1 to 3, characterized in that the housing (1) comprises a first housing protrusion (1d) and a second housing protrusion (1e) which extend in axial direction radially spaced apart from one another, wherein the piston (2) is configured such that it constitutes two accommodating portions (2d) each of which at least partially accommodates one of the housing protrusions (1d, 1e), wherein a radial piston section (2g) extends between the two accommodating portions (2d) which axially covers the pressure chamber (1c) above, wherein a recess (2a) for one annular seal (3) is introduced into a piston wall portion (2b2) which faces a radial outer wall of the second housing protrusion (1e) and a recess (2a) for the other annular seal (3) is introduced into a piston wall portion (2b1) which faces a radial inner wall of the first housing protrusion (1d).

12. The separation system according to claim 11, characterized in that one sliding seal ring (5) each is introduced into the radially outer wall of the first housing protrusion (Id) and into the radially inner wall of the second housing protrusion (1e).

13. The separation system according to any one of claims 1 to 3, characterized in that the housing (1) constitutes an axially upwardly open annular pressure chamber (1c) having an outer wall (1h) which delimits the pressure chamber (1c) radially outwardly and an inner wall (1i) which delimits the pressure chamber (1c) radially inwardly, wherein the inner wall (1i) extends radially outwardly of the longitudinal axis X of the separation system and comprises a first inner wall section (1i1) and a second inner wall section (1i3) which extends radially inwardly of the first inner wall section (1i1) and a step wall section (1i2) which connects the two inner wall sections (1i1, 1i3), wherein the piston (2) bounds the pressure chamber in axial direction upwardly and a recess (2a) for one annular seal (3) is introduced into a piston wall portion (2b3) which faces the outer wall (1h) of the pressure chamber (1c) and a recess (2a) for the other annular seal (3) is introduced into a piston wall portion (2b4) which faces the first inner wall section (1i1) of the pressure chamber (1c).

14. The separation system according to claim 11, characterized in that one sliding seal ring (5) each is accommodated in each of the piston wall portions (2b3, 2b4) axially above the corresponding annular seal (3).

15. The separation system according to claim 13, characterized in that one overhang (2h) each is constituted in the piston wall portions (2b3, 2b4) which limits the movement of the annular seal (3) in axial direction downwardly.

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