JP6856636B2 - Slave cylinder for hydraulic release system that operates friction clutch - Google Patents

Description

The present invention is a slave cylinder for a hydraulic release system that operates a friction clutch, which is a housing and at least one pressure chamber formed in the housing. In the pressure chamber, a piston is provided as a release bearing. The release bearing is slidably housed in the axial direction to operate, and has an inner bearing race located on the inner side in the radial direction and an outer bearing race located on the outer side in the radial direction, and has a radial direction of the pressure chamber. A support ring that interacts with the pressure chamber and the release bearing, which is urged via a preload spring arranged on the outside. The preload spring is axially supported by the support ring. The support ring relates to a slave cylinder comprising at least one holding means, wherein the holding means is axially fixed with antifouling means to prevent foreign matter from entering the pressure chamber. ..

Slave cylinders, especially concentric slave cylinders, are used in hydraulic systems that operate clutches. The master cylinder is operated by operating the clutch pedal. The master cylinder moves the fluid column in the hydraulic conduit towards the slave cylinder. As a result, an axially slidable piston arranged in the slave cylinder is operated, while the piston acts on the release bearing on the clutch side to operate the clutch.

The concentric slave cylinder (also referred to as a concentric slave cylinder) has a ring-shaped housing, which is concentrically arranged around the transmission input shaft. The housing of the slave cylinder is manufactured from metal on demand or made from plastic by injection molding. At least one pressure chamber exists in the ring-shaped housing, and a ring-shaped piston is arranged in the pressure chamber so as to be displaced in the axial direction. On the outside of the piston, an energy accumulator that acts on the release bearing, such as a preload spring, is provided. In the prior art, elastic bellows are provided to prevent foreign matter from entering the pressure chamber of the slave cylinder. The bellows surrounds the piston or pressure chamber from the outside, with a slave cylinder housing on one side and a plastic support ring on the other, as can be seen, for example, in German Patent Application Publication No. 102013204126. It is supported and the support ring is coupled to the release bearing. This allows the bellows to be axially fastened to the slave cylinder housing.

Known solutions in the art can prevent foreign matter from entering the pressure chamber of the slave cylinder. However, the drawback of known solutions is that the support ring made of plastic can be damaged. This is because the support ring made of plastic fixes the antifouling means and also forms the support surface for the preload spring.

Therefore, an object of the present invention is to avoid known drawbacks in the prior art. In particular, an object of the present invention is to configure the support ring more stably and at the same time to configure it so that it can be easily manufactured at low cost.

The above problem is solved by the characteristics of the independent claims. An advantageous form of the present invention can be found in the dependent claims.

A slave cylinder for a hydraulic release system that operates a friction clutch, a housing and at least one pressure chamber formed within the housing, in which a piston operates the release bearing. Accommodated so as to be slidable in the axial direction, the release bearing has an inner bearing race located on the inner side in the radial direction and an outer bearing race located on the outer side in the radial direction, and is arranged on the radial outer side of the pressure chamber. It is a support ring that interacts with the pressure chamber and the release bearing, which is urged via the preload spring, and the preload spring is axially supported by the support ring. In a slave cylinder comprising at least one holding means, the holding means comprising a support ring, in which antifouling means for preventing foreign matter from entering the pressure chamber is axially fixed, according to the present invention. , The support ring is made of a thin metal plate.

By forming the support ring from a thin metal plate, the support ring can be formed stably at low cost.

The preload spring may be directly supported by the support ring and / or the housing, or indirectly, eg, via another component, the support ring and / or the housing.

Release bearings can be directly or indirectly coupled to or interact with the piston. For this purpose, a "holding metal thin plate" may be provided between the piston and the race in the bearing.

In one advantageous form, the support ring is formed in a stepped manner. In particular, the support ring is formed of a base portion and two lands connected to the base portion. Therefore, the support ring connects to a first land that extends axially, a base portion that connects to the first land and extends radially, and another land that connects to the base portion and also extends axially. And have. This configuration of the support ring allows the support ring to be incorporated into the slave cylinder in an optimized form with respect to assembly space.

Preferably, the support ring has at least one fold, which is specifically formed by edge bending (Abkanten) or folding (Schwenkbiegen). Folds or creases are provided specifically at the base of the support ring. This makes the support ring easy to manufacture and extremely stable.

In another advantageous embodiment, the holding means is formed on the support ring by at least one holding nose that is punched or bent. The retaining nose is used to receive the antifouling means and secure it in the axial direction.

The holding means is formed in the form of at least one holding nose, particularly at least one holding nose extending radially, or a plurality of holding noses, particularly a plurality evenly distributed around the support ring. Formed in the form of a retaining nose, the plurality of retaining noses are located on the lands of the support ring.

In another embodiment, the antifouling measure is a bellows. Bellows are particularly elastically constructed, for example, from rubber or plastic.

Advantageously, the support ring is abutted by another support ring that is formed at least partially complementary to the support ring. This other support ring is particularly similarly formed from a thin metal plate.

Preferably, at least one of both support rings has a centering means that centers and / or directs both support rings to each other. These centering means may be formed, for example, in the form of beads. The bead engages in a complementary groove or void in the other support ring.

Preferably, at least one holding means for the antifouling means is formed in the other support ring described above.

In another advantageous form, the support ring is tightly coupled to the radial inner surface of the race in the bearing. The support ring is particularly tightly press-bonded to the race in the bearing. The coupling between the support ring and the bearing can be carried out by force coupling and / or shape coupling.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings based on examples.

It is sectional drawing of the slave cylinder by 1st Embodiment. It is a partial view of the slave cylinder provided with the support ring shown in FIG. It is a three-dimensional view of the support ring shown in FIG. It is a partial view of the slave cylinder provided with the support ring according to the 2nd Embodiment. It is a three-dimensional view of the support ring shown in FIG. It is a partial view of the slave cylinder provided with the support ring according to the 3rd Embodiment. It is a three-dimensional view of the support ring shown in FIG. It is a partial view of the slave cylinder provided with the support ring according to 4th Embodiment. It is a three-dimensional view of the support ring shown in FIG. FIG. 5 is a partial view of a slave cylinder provided with a support ring according to a fifth embodiment. It is a three-dimensional view of the support ring shown in FIG. FIG. 6 is a partial view of a slave cylinder provided with a support ring according to a sixth embodiment. It is a three-dimensional view of the support ring shown in FIG.

FIG. 1 is a cross-sectional view of the slave cylinder 1. The slave cylinder 1 includes a housing 2, and a pressure chamber 3 is formed in the housing 2. The pressure chamber 3 is defined by a housing 2 on both sides. The housing 2 and the pressure chamber 3 are formed in a ring shape. A ring-shaped piston 4 is supported in the pressure chamber 3, and the piston 4 operates in the axial direction a. The housing 2 is preferably made of plastic or metal, such as aluminum. When operating a clutch pedal (not shown), the master cylinder is operated. The master cylinder is connected to the slave cylinder 1 via a pressure pipeline or a hydraulic pressure section. Due to the pressurization in the pressure chamber 3 of the slave cylinder 1, the piston 4 is displaced in the axial direction, thereby acting on the release bearing 5. On the other hand, the release bearing 5 operates the clutch. The axial movement of the piston 4 is restricted by a piston stroke limiting portion, preferably a piston stroke limiting portion in the form of a stopper ring. The piston stroke limiting portion is fixed in the housing wall of the slave cylinder housing 2 by press fitting or the like. The piston stroke limiting portion reaches the pressure chamber 3 in the radial direction r with respect to the central axis X, thereby forming a piston stopper.

The piston 4 of the slave cylinder 1 is coupled to the seal via a piston-seal-coupling portion. The seal is a grooved seal ring and the dovetail geometry of the grooved seal ring is fitted into the complementary receiving part of the piston-seal-joint. The seal seals the pressure chamber with two seal lips.

The piston 4 is coupled to the release bearing 5, particularly the in-bearing race 5a of the release bearing 5 via a piston-bearing-coupling portion. The release bearing 5 is mainly composed of an inner bearing race 5a, an outer bearing race 5b, and a rolling element (not shown in detail) arranged between both bearing races 5a and 5b. The piston-bearing-coupling portion is preferably formed as a holding metal sheet, and the holding metal sheet is in contact with the race 5a in the bearing and the piston 4.

A thrust disc is connected to the release bearing 5 in the axial direction a, and a disc spring finger portion of the clutch is mounted on the thrust disc.

An energy accumulator in the form of a preload spring 6 is provided on the outer side of the pressure chamber 3 or the outer wall of the slave cylinder in the radial direction. The preload spring 6 is indirectly or directly supported by the housing 2 on one side in the axial direction a and by the release bearing 5 on the other side.

A support ring 7 is provided between the release bearing 5 and the preload spring 6 in the axial direction a. The support ring 7 is made of metal, especially a thin metal plate. The support ring 7 includes a first land 7a, a second land 7b, and a base portion 7c. The base portion 7c and the lands 7a and 7b are integrally connected to each other or formed as one piece.

In particular, the second land 7b has one holding means 8 extending so as to surround the entire circumference of the land 7b in the form of a holding nose. However, a plurality of holding means 8 may be provided. The plurality of holding means 8 are distributed all around the land 7b at particularly regular intervals. Particularly preferably, six retaining noses are provided that are distributed around the perimeter at regular intervals. The antifouling means 9 may be attached to the support ring 7 by a clip connection.

Further, an additional support portion 12 (not shown) mounted on the housing 2 may be provided. The support portion 12 can be configured in a ring shape and is placed in a receiving portion that is complementary to the support portion 12 in the housing 2. Similarly, the support portion 12 has a land (not shown in detail), and the land may be provided with a holding means for fixing the stain preventing means 9. The holding means of the support portion 12 may be formed in the same manner as the holding means 8 of the support ring 7. The preload spring 6 is preferably supported by the support portion 12 on the housing side and supported by the support ring 7 on the release bearing side. Alternatively, the preload spring 6 may be directly supported by the housing 2 as shown in FIG. Thus, the preload spring 6 is located radially outside the pressure chamber 3 between the outer wall of the housing of the pressure chamber and another land extending from the housing 2. The antifouling means 9 may be fixed or abutted against this other land. Antifouling means 9 is provided on the outer side of the preload spring 6 in the radial direction.

The elastic antifouling means is fixed to both the support ring 7 and the housing 2 by the holding means. To this end, the antifouling means 9 has at least one receiving portion that interacts with the holding means 8 of the support ring 7. Further, the plurality of holding means 8 in the form of holding noses for fixing the antifouling means may be evenly distributed around the support ring 7. Preferably, the support ring 7 is symmetrically configured.

The antifouling means 9 is preferably a bellows. The bellows is elastically configured to prevent foreign particles from entering the pressure chamber 3 of the slave cylinder 1.

FIG. 1a is a partial view of the slave cylinder 1 and shows the support ring 7 in the first embodiment. The support ring 7 has a base portion 7c, on which the first land 7a extends toward the release bearing 5 in the axial direction a, particularly at an angle of approximately 90 °. At this time, the first land 7a is press-fitted to the surface of the race 5a in the bearing, which is located inside in the radial direction. Further, a second land 7b extends to the second end of the base portion 7c, and the second land 7b also extends toward the pressure chamber 3 at an angle of approximately 90 °. ing.

As shown in FIG. 1b, the support ring 7 is preferably formed in one piece. The support ring 7 is made from a thin metal disc and is multiple diffracted so that creases are formed in the region of the first land 7a and the region of the second land 7b. A bay out portion is punched out in the region of the first land 7a to ensure press fitting of the support ring 7 within the region of the in-bearing race 5a of the release bearing 5. A crease is similarly provided in the region of the second land 7b, and the holding means 8 for the stain preventing means 9 is formed at the crease by the crease. The holding means 8 engages with a space provided in the stain preventing means 9, whereby the stain preventing means 9 can be fastened in the axial direction. Alternatively, the support ring 7 may be manufactured from aluminum or plastic in one piece.

FIG. 2 shows a second embodiment of the support ring 7. The support ring 7 is formed so that creases or folds occur in the region of the base portion 7c. The holding means 8 is formed by embossing on the second land 7b. In FIG. 2a, it can be seen that a plurality of holding means 8 in the form of a stamped holding nose are formed around the ring-shaped support ring 7.

FIG. 3 shows the support ring 7 according to the third embodiment. Another support ring 10 is in direct contact with the support ring 7. Another support ring 10 is also made of a thin metal plate. However, another support ring 10 may be made from another material, such as plastic. In this embodiment as well, the support ring 7 includes a first land 7a, a base portion 7c connected to the first land 7a, and at least one second land 7b connected to the base portion 7c. Has. As can be seen in FIG. 3a, another support ring 10 has a base portion 10a, which is at least partially in direct contact with the base portion 7c of the support ring 7. .. Both base portions 10a and 7c preferably extend in the axial direction a. At least one land 10b is connected to the base portion 10a of another support ring 10 at an angle of approximately 90 °. The land 10b is provided with a holding means 8, particularly a holding means 8 in the form of a holding nose. These holding means 8 are formed by bending or bending. In particular, at least one land 10b is provided with a holding means for retaining the antifouling means 9. The lands 10b preferably do not directly abut on the second lands 7b of the support ring 7. Preferably, a gap is provided between the land 10b and the second land 7b. Preferably, a plurality of lands 10b are provided around the other support ring 10 at regular intervals and have a plurality of holding means. The support rings 7 and 10 can be centered or oriented with each other via the centering means 11. These centering means 11 can be provided on one or both of the support rings. The centering means 11 is particularly a protrusion, preferably a protrusion provided on another support ring. Alternatively, another support ring 10 is provided with a notch, and the support ring 7 is provided with a bay portion, and the bay portion of the support ring 7 is associated with a correspondingly formed notch of the other support ring 10. It may be matched (and vice versa). As a result, the centering means also prevents the both support rings 7 and 10 from rotating each other. According to the embodiment shown in FIGS. 3 and 3a, this proposes a two-piece support ring consisting of support rings 7 and 10.

4 and 4a show the support ring according to the fourth embodiment. Similar to FIG. 3, the support ring is formed into two pieces including a first support ring 7 and a second support ring 10. The structure of the support rings 7 and 10 roughly corresponds to the above-described embodiment shown in FIGS. 3 and 3a. In the configuration shown in FIG. 4, the support rings 7 and 10 are centered by the land 10b directly in contact with the second land 7b of the support ring 7. As a result, the separate centering means 11 can be omitted. As can be seen in FIG. 4, the support ring 7 or support ring 10 has at least one surface extending at the base portion at an angle of approximately 45 °. This surface of the base portions 7c and 10a is used as a contact portion or a stopper 12 for the preload spring 6 arranged inward in the radial direction. Preferably, the base portion 10a or the base portion 7c of the support ring may be provided with another land (not shown) arranged radially outside the bearing outer race 5b. In this case, this other land overlaps the outer bearing race 5b at least partially in the axial direction, thereby preventing foreign matter from entering the release bearing 5. This land can be specifically formed into one piece with support rings 7, 10.

FIG. 5 shows a slave cylinder 1 having a two-piece support ring consisting of support rings 7 and 10. Also in this embodiment, both support rings 7 and 10 are advantageously formed of a thin metal plate. A third land 7e is connected to the support ring 10, and the third land 7e extends in the axial direction a toward the release bearing 5. The third land 7e is arranged radially outside the bearing outer race 5b and surrounds the bearing outer race 5b at least partially in the axial direction a so that foreign matter and / or liquid can escape into the release bearing 5. It can be prevented from entering. FIG. 5a shows the details of the support ring shown in FIG. FIG. 5a shows a detent 14 integrated within the support ring 7. A centering portion is provided on the first land 7a of the support ring 7, and the centering portion abuts on the inner surface of the race 5a in the bearing.

FIG. 6 shows a slave cylinder with a one-piece support ring 7, which is a first land 7a, a second land 7b, a base portion 7c with a folded 7d, and a third. It has a land 7e, and the third land 7e surrounds the bearing outer race 5b at least partially from the outside in the radial direction. In more detail, FIG. 6a shows that the region of the third land 7e is also provided with a fold, which allows the support ring to be easily manufactured and stably configured. Further, the opening 13 provided in the support ring can be seen. The opening 13 can be formed by punching, for example, and is used for venting the air in the stain prevention means 9 during the operation of the stain prevention means 9. A plurality of openings 13 can be provided around the support ring 7, and the openings 13 are particularly regularly spaced. The detent 14 is also specified again. The detent 14 and the opening 13 can be used in all of the illustrated embodiments of the support rings 7 and 10.

The above-described embodiment is a slave cylinder for a hydraulic release system that operates a friction clutch, and is a housing and at least one pressure chamber formed in the housing, and a piston is contained in the pressure chamber. It is housed so as to be slidable in the axial direction to operate the release bearing, and the release bearing has an inner bearing race located on the inner side in the radial direction and an outer bearing race located on the outer side in the radial direction, and has a pressure chamber. A support ring that interacts with the pressure chamber and the release bearing, which is urged via a preload spring arranged on the outer side in the radial direction. The preload spring is axially supported by the support ring. The support ring comprises at least one holding means, the holding means comprising a support ring, which is axially fixed with antifouling means to prevent foreign matter from entering the pressure chamber. And the support ring relates to a slave cylinder for a hydraulic release system that operates a friction clutch, which is made of a thin metal plate.

1 Slave cylinder 2 Housing 3 Pressure chamber 4 Piston 5 Release bearing 5a In-bearing race 5b Out-of-bearing race 6 Preload spring 7 Support ring 7a First land 7b Second land 7c Base part 7d Folded 8 Holding means 9 Stain prevention means 10 Another support ring 10a Base part 10b Land 11 Centering means 12 Stopper a Axial direction r Radial direction X Center axis

Claims (10)

A slave cylinder (1) for a hydraulic release system that operates a friction clutch.
Housing (2) and
At least one pressure chamber (3) formed in the housing (2), in which the piston (4) axially operates the release bearing (5). The release bearing (5) is slidably housed, and has an inner bearing race (5a) located on the inner side in the radial direction and an outer bearing race (5b) located on the outer side in the radial direction. A pressure chamber (3) and a pressure chamber (3) urged via a preload spring (6) arranged radially outside the chamber (3).
A support ring (7) interacting with the release bearing (5), wherein the preload spring (6) is axially supported by the support ring (7), and the support ring (7) is supported. ) Has at least one holding means (8), and the holding means (8) is axially fixed with antifouling means (9) for preventing foreign matter from entering the pressure chamber (3). The support ring (7) and
In the slave cylinder (1) provided with
The support ring (7) is formed of a thin metal plate, and the end portion of the stain prevention means (9) is arranged between another support ring (10) and the holding means (8). A slave cylinder for a hydraulic release system that operates a friction clutch. The slave cylinder according to claim 1, wherein the support ring (7) is formed in a stepped shape. The first or second aspect of the present invention, wherein the support ring (7) is formed of a base portion (7c) and two lands (7a, 7b) connected to the base portion (7c). Slave cylinder. Any of claims 1 to 3, wherein the support ring (7) has at least one fold (7d), the fold (7d) being formed by edge bending or folding bending. The slave cylinder according to item 1. One of claims 1 to 4, wherein the holding means (8) is formed on the support ring (7) by at least one holding nose that is punched or bent. The slave cylinder described. The holding means (8) is
Or is formed in the form of at least one holding nose extends so as to surround a half radial, or
Are formed in the form of a plurality of holding noses which are distributed around said support ring to evenly (7), the holding nose of the plurality of are arranged in the land (7a, 7b) of the support ring (7) ing,
The slave cylinder according to any one of claims 1 to 5, wherein the slave cylinder is characterized in that. 1 to 6, wherein another support ring (10) formed at least partially complementarily to the support ring (7) is in contact with the support ring (7). The slave cylinder according to any one of the above items. The other support ring (10) is manufactured from a thin metal plate, and at least one of the two support rings (7, 10) centers and / or directs both the support rings (7, 10) to each other. The slave cylinder according to claim 7, further comprising a centering means (11). The slave cylinder according to claim 7 or 8, wherein the at least one holding means (8) for the antifouling means (9) is formed in the other support ring (10). The one according to any one of claims 1 to 9, wherein the support ring (7) is firmly coupled to a surface of the bearing inner race (5a) located inside in the radial direction. Slave cylinder.

Images